// Copyright (c) 2012 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #define _USE_MATH_DEFINES // For VC++ to get M_PI. This has to be first. #include "ui/views/view.h" #include #include #include #include #include "base/logging.h" #include "base/macros.h" #include "base/memory/ptr_util.h" #include "base/message_loop/message_loop.h" #include "base/stl_util.h" #include "base/strings/stringprintf.h" #include "base/strings/utf_string_conversions.h" #include "base/trace_event/trace_event.h" #include "build/build_config.h" #include "third_party/skia/include/core/SkRect.h" #include "ui/accessibility/ax_enums.h" #include "ui/base/cursor/cursor.h" #include "ui/base/dragdrop/drag_drop_types.h" #include "ui/base/ime/input_method.h" #include "ui/compositor/clip_recorder.h" #include "ui/compositor/compositor.h" #include "ui/compositor/dip_util.h" #include "ui/compositor/layer.h" #include "ui/compositor/layer_animator.h" #include "ui/compositor/paint_context.h" #include "ui/compositor/paint_recorder.h" #include "ui/compositor/transform_recorder.h" #include "ui/display/screen.h" #include "ui/events/event_target_iterator.h" #include "ui/gfx/canvas.h" #include "ui/gfx/geometry/point3_f.h" #include "ui/gfx/geometry/point_conversions.h" #include "ui/gfx/interpolated_transform.h" #include "ui/gfx/path.h" #include "ui/gfx/scoped_canvas.h" #include "ui/gfx/skia_util.h" #include "ui/gfx/transform.h" #include "ui/native_theme/native_theme.h" #include "ui/views/accessibility/native_view_accessibility.h" #include "ui/views/background.h" #include "ui/views/border.h" #include "ui/views/context_menu_controller.h" #include "ui/views/drag_controller.h" #include "ui/views/focus/view_storage.h" #include "ui/views/layout/layout_manager.h" #include "ui/views/views_delegate.h" #include "ui/views/widget/native_widget_private.h" #include "ui/views/widget/root_view.h" #include "ui/views/widget/tooltip_manager.h" #include "ui/views/widget/widget.h" #if defined(OS_WIN) #include "base/win/scoped_gdi_object.h" #include "ui/native_theme/native_theme_win.h" #endif namespace views { namespace { #if defined(OS_WIN) const bool kContextMenuOnMousePress = false; #else const bool kContextMenuOnMousePress = true; #endif // Default horizontal drag threshold in pixels. // Same as what gtk uses. const int kDefaultHorizontalDragThreshold = 8; // Default vertical drag threshold in pixels. // Same as what gtk uses. const int kDefaultVerticalDragThreshold = 8; // Returns the top view in |view|'s hierarchy. const View* GetHierarchyRoot(const View* view) { const View* root = view; while (root && root->parent()) root = root->parent(); return root; } } // namespace // static const char View::kViewClassName[] = "View"; //////////////////////////////////////////////////////////////////////////////// // View, public: // Creation and lifetime ------------------------------------------------------- View::View() : owned_by_client_(false), id_(0), group_(-1), parent_(NULL), visible_(true), enabled_(true), notify_enter_exit_on_child_(false), registered_for_visible_bounds_notification_(false), needs_layout_(true), snap_layer_to_pixel_boundary_(false), flip_canvas_on_paint_for_rtl_ui_(false), paint_to_layer_(false), accelerator_focus_manager_(NULL), registered_accelerator_count_(0), next_focusable_view_(NULL), previous_focusable_view_(NULL), focus_behavior_(FocusBehavior::NEVER), context_menu_controller_(NULL), drag_controller_(NULL), native_view_accessibility_(NULL) { SetTargetHandler(this); } View::~View() { if (parent_) parent_->RemoveChildView(this); ViewStorage::GetInstance()->ViewRemoved(this); for (Views::const_iterator i(children_.begin()); i != children_.end(); ++i) { (*i)->parent_ = NULL; if (!(*i)->owned_by_client_) delete *i; } // Release ownership of the native accessibility object, but it's // reference-counted on some platforms, so it may not be deleted right away. if (native_view_accessibility_) native_view_accessibility_->Destroy(); } // Tree operations ------------------------------------------------------------- const Widget* View::GetWidget() const { // The root view holds a reference to this view hierarchy's Widget. return parent_ ? parent_->GetWidget() : NULL; } Widget* View::GetWidget() { return const_cast(const_cast(this)->GetWidget()); } void View::AddChildView(View* view) { if (view->parent_ == this) return; AddChildViewAt(view, child_count()); } void View::AddChildViewAt(View* view, int index) { CHECK_NE(view, this) << "You cannot add a view as its own child"; DCHECK_GE(index, 0); DCHECK_LE(index, child_count()); // If |view| has a parent, remove it from its parent. View* parent = view->parent_; ui::NativeTheme* old_theme = NULL; if (parent) { old_theme = view->GetNativeTheme(); if (parent == this) { ReorderChildView(view, index); return; } parent->DoRemoveChildView(view, true, true, false, this); } // Sets the prev/next focus views. InitFocusSiblings(view, index); view->parent_ = this; children_.insert(children_.begin() + index, view); // Ensure the layer tree matches the view tree before calling to any client // code. This way if client code further modifies the view tree we are in a // sane state. const bool did_reparent_any_layers = view->UpdateParentLayers(); Widget* widget = GetWidget(); if (did_reparent_any_layers && widget) widget->UpdateRootLayers(); ReorderLayers(); // Make sure the visibility of the child layers are correct. // If any of the parent View is hidden, then the layers of the subtree // rooted at |this| should be hidden. Otherwise, all the child layers should // inherit the visibility of the owner View. view->UpdateLayerVisibility(); if (widget) { const ui::NativeTheme* new_theme = view->GetNativeTheme(); if (new_theme != old_theme) view->PropagateNativeThemeChanged(new_theme); } ViewHierarchyChangedDetails details(true, this, view, parent); for (View* v = this; v; v = v->parent_) v->ViewHierarchyChangedImpl(false, details); view->PropagateAddNotifications(details); UpdateTooltip(); if (widget) { RegisterChildrenForVisibleBoundsNotification(view); if (view->visible()) view->SchedulePaint(); } if (layout_manager_.get()) layout_manager_->ViewAdded(this, view); } void View::ReorderChildView(View* view, int index) { DCHECK_EQ(view->parent_, this); if (index < 0) index = child_count() - 1; else if (index >= child_count()) return; if (children_[index] == view) return; const Views::iterator i(std::find(children_.begin(), children_.end(), view)); DCHECK(i != children_.end()); children_.erase(i); // Unlink the view first View* next_focusable = view->next_focusable_view_; View* prev_focusable = view->previous_focusable_view_; if (prev_focusable) prev_focusable->next_focusable_view_ = next_focusable; if (next_focusable) next_focusable->previous_focusable_view_ = prev_focusable; // Add it in the specified index now. InitFocusSiblings(view, index); children_.insert(children_.begin() + index, view); ReorderLayers(); } void View::RemoveChildView(View* view) { DoRemoveChildView(view, true, true, false, NULL); } void View::RemoveAllChildViews(bool delete_children) { while (!children_.empty()) DoRemoveChildView(children_.front(), false, false, delete_children, NULL); UpdateTooltip(); } bool View::Contains(const View* view) const { for (const View* v = view; v; v = v->parent_) { if (v == this) return true; } return false; } int View::GetIndexOf(const View* view) const { Views::const_iterator i(std::find(children_.begin(), children_.end(), view)); return i != children_.end() ? static_cast(i - children_.begin()) : -1; } // Size and disposition -------------------------------------------------------- void View::SetBounds(int x, int y, int width, int height) { SetBoundsRect(gfx::Rect(x, y, std::max(0, width), std::max(0, height))); } void View::SetBoundsRect(const gfx::Rect& bounds) { if (bounds == bounds_) { if (needs_layout_) { needs_layout_ = false; Layout(); } return; } if (visible_) { // Paint where the view is currently. SchedulePaintBoundsChanged( bounds_.size() == bounds.size() ? SCHEDULE_PAINT_SIZE_SAME : SCHEDULE_PAINT_SIZE_CHANGED); } gfx::Rect prev = bounds_; bounds_ = bounds; BoundsChanged(prev); } void View::SetSize(const gfx::Size& size) { SetBounds(x(), y(), size.width(), size.height()); } void View::SetPosition(const gfx::Point& position) { SetBounds(position.x(), position.y(), width(), height()); } void View::SetX(int x) { SetBounds(x, y(), width(), height()); } void View::SetY(int y) { SetBounds(x(), y, width(), height()); } gfx::Rect View::GetContentsBounds() const { gfx::Rect contents_bounds(GetLocalBounds()); if (border_.get()) contents_bounds.Inset(border_->GetInsets()); return contents_bounds; } gfx::Rect View::GetLocalBounds() const { return gfx::Rect(size()); } gfx::Insets View::GetInsets() const { return border_.get() ? border_->GetInsets() : gfx::Insets(); } gfx::Rect View::GetVisibleBounds() const { if (!IsDrawn()) return gfx::Rect(); gfx::Rect vis_bounds(GetLocalBounds()); gfx::Rect ancestor_bounds; const View* view = this; gfx::Transform transform; while (view != NULL && !vis_bounds.IsEmpty()) { transform.ConcatTransform(view->GetTransform()); gfx::Transform translation; translation.Translate(static_cast(view->GetMirroredX()), static_cast(view->y())); transform.ConcatTransform(translation); vis_bounds = view->ConvertRectToParent(vis_bounds); const View* ancestor = view->parent_; if (ancestor != NULL) { ancestor_bounds.SetRect(0, 0, ancestor->width(), ancestor->height()); vis_bounds.Intersect(ancestor_bounds); } else if (!view->GetWidget()) { // If the view has no Widget, we're not visible. Return an empty rect. return gfx::Rect(); } view = ancestor; } if (vis_bounds.IsEmpty()) return vis_bounds; // Convert back to this views coordinate system. gfx::RectF views_vis_bounds(vis_bounds); transform.TransformRectReverse(&views_vis_bounds); // Partially visible pixels should be considered visible. return gfx::ToEnclosingRect(views_vis_bounds); } gfx::Rect View::GetBoundsInScreen() const { gfx::Point origin; View::ConvertPointToScreen(this, &origin); return gfx::Rect(origin, size()); } gfx::Size View::GetPreferredSize() const { if (layout_manager_.get()) return layout_manager_->GetPreferredSize(this); return gfx::Size(); } int View::GetBaseline() const { return -1; } void View::SizeToPreferredSize() { gfx::Size prefsize = GetPreferredSize(); if ((prefsize.width() != width()) || (prefsize.height() != height())) SetBounds(x(), y(), prefsize.width(), prefsize.height()); } gfx::Size View::GetMinimumSize() const { return GetPreferredSize(); } gfx::Size View::GetMaximumSize() const { return gfx::Size(); } int View::GetHeightForWidth(int w) const { if (layout_manager_.get()) return layout_manager_->GetPreferredHeightForWidth(this, w); return GetPreferredSize().height(); } void View::SetVisible(bool visible) { if (visible != visible_) { // If the View is currently visible, schedule paint to refresh parent. // TODO(beng): not sure we should be doing this if we have a layer. if (visible_) SchedulePaint(); visible_ = visible; AdvanceFocusIfNecessary(); // Notify the parent. if (parent_) { parent_->ChildVisibilityChanged(this); parent_->NotifyAccessibilityEvent(ui::AX_EVENT_CHILDREN_CHANGED, false); } // This notifies all sub-views recursively. PropagateVisibilityNotifications(this, visible_); UpdateLayerVisibility(); // If we are newly visible, schedule paint. if (visible_) SchedulePaint(); } } bool View::IsDrawn() const { return visible_ && parent_ ? parent_->IsDrawn() : false; } void View::SetEnabled(bool enabled) { if (enabled != enabled_) { enabled_ = enabled; AdvanceFocusIfNecessary(); OnEnabledChanged(); } } void View::OnEnabledChanged() { SchedulePaint(); } // Transformations ------------------------------------------------------------- gfx::Transform View::GetTransform() const { if (!layer()) return gfx::Transform(); gfx::Transform transform = layer()->transform(); gfx::ScrollOffset scroll_offset = layer()->CurrentScrollOffset(); transform.Translate(-scroll_offset.x(), -scroll_offset.y()); return transform; } void View::SetTransform(const gfx::Transform& transform) { if (transform.IsIdentity()) { if (layer()) { layer()->SetTransform(transform); if (!paint_to_layer_) DestroyLayer(); } else { // Nothing. } } else { if (!layer()) CreateLayer(); layer()->SetTransform(transform); layer()->ScheduleDraw(); } } void View::SetPaintToLayer(bool paint_to_layer) { if (paint_to_layer_ == paint_to_layer) return; paint_to_layer_ = paint_to_layer; if (paint_to_layer_ && !layer()) { CreateLayer(); } else if (!paint_to_layer_ && layer()) { DestroyLayer(); } } std::unique_ptr View::RecreateLayer() { std::unique_ptr old_layer = LayerOwner::RecreateLayer(); Widget* widget = GetWidget(); if (widget) widget->UpdateRootLayers(); return old_layer; } // RTL positioning ------------------------------------------------------------- gfx::Rect View::GetMirroredBounds() const { gfx::Rect bounds(bounds_); bounds.set_x(GetMirroredX()); return bounds; } gfx::Point View::GetMirroredPosition() const { return gfx::Point(GetMirroredX(), y()); } int View::GetMirroredX() const { return parent_ ? parent_->GetMirroredXForRect(bounds_) : x(); } int View::GetMirroredXForRect(const gfx::Rect& bounds) const { return base::i18n::IsRTL() ? (width() - bounds.x() - bounds.width()) : bounds.x(); } int View::GetMirroredXInView(int x) const { return base::i18n::IsRTL() ? width() - x : x; } int View::GetMirroredXWithWidthInView(int x, int w) const { return base::i18n::IsRTL() ? width() - x - w : x; } // Layout ---------------------------------------------------------------------- void View::Layout() { needs_layout_ = false; // If we have a layout manager, let it handle the layout for us. if (layout_manager_.get()) layout_manager_->Layout(this); // Make sure to propagate the Layout() call to any children that haven't // received it yet through the layout manager and need to be laid out. This // is needed for the case when the child requires a layout but its bounds // weren't changed by the layout manager. If there is no layout manager, we // just propagate the Layout() call down the hierarchy, so whoever receives // the call can take appropriate action. for (int i = 0, count = child_count(); i < count; ++i) { View* child = child_at(i); if (child->needs_layout_ || !layout_manager_.get()) { TRACE_EVENT1("views", "View::Layout", "class", child->GetClassName()); child->needs_layout_ = false; child->Layout(); } } } void View::InvalidateLayout() { // Always invalidate up. This is needed to handle the case of us already being // valid, but not our parent. needs_layout_ = true; if (parent_) parent_->InvalidateLayout(); } LayoutManager* View::GetLayoutManager() const { return layout_manager_.get(); } void View::SetLayoutManager(LayoutManager* layout_manager) { if (layout_manager == layout_manager_.get()) return; layout_manager_.reset(layout_manager); if (layout_manager_) layout_manager_->Installed(this); } void View::SnapLayerToPixelBoundary() { if (!layer()) return; if (snap_layer_to_pixel_boundary_ && layer()->parent() && layer()->GetCompositor()) { ui::SnapLayerToPhysicalPixelBoundary(layer()->parent(), layer()); } else { // Reset the offset. layer()->SetSubpixelPositionOffset(gfx::Vector2dF()); } } // Attributes ------------------------------------------------------------------ const char* View::GetClassName() const { return kViewClassName; } const View* View::GetAncestorWithClassName(const std::string& name) const { for (const View* view = this; view; view = view->parent_) { if (!strcmp(view->GetClassName(), name.c_str())) return view; } return NULL; } View* View::GetAncestorWithClassName(const std::string& name) { return const_cast(const_cast(this)-> GetAncestorWithClassName(name)); } const View* View::GetViewByID(int id) const { if (id == id_) return const_cast(this); for (int i = 0, count = child_count(); i < count; ++i) { const View* view = child_at(i)->GetViewByID(id); if (view) return view; } return NULL; } View* View::GetViewByID(int id) { return const_cast(const_cast(this)->GetViewByID(id)); } void View::SetGroup(int gid) { // Don't change the group id once it's set. DCHECK(group_ == -1 || group_ == gid); group_ = gid; } int View::GetGroup() const { return group_; } bool View::IsGroupFocusTraversable() const { return true; } void View::GetViewsInGroup(int group, Views* views) { if (group_ == group) views->push_back(this); for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->GetViewsInGroup(group, views); } View* View::GetSelectedViewForGroup(int group) { Views views; GetWidget()->GetRootView()->GetViewsInGroup(group, &views); return views.empty() ? NULL : views[0]; } // Coordinate conversion ------------------------------------------------------- // static void View::ConvertPointToTarget(const View* source, const View* target, gfx::Point* point) { DCHECK(source); DCHECK(target); if (source == target) return; const View* root = GetHierarchyRoot(target); CHECK_EQ(GetHierarchyRoot(source), root); if (source != root) source->ConvertPointForAncestor(root, point); if (target != root) target->ConvertPointFromAncestor(root, point); } // static void View::ConvertRectToTarget(const View* source, const View* target, gfx::RectF* rect) { DCHECK(source); DCHECK(target); if (source == target) return; const View* root = GetHierarchyRoot(target); CHECK_EQ(GetHierarchyRoot(source), root); if (source != root) source->ConvertRectForAncestor(root, rect); if (target != root) target->ConvertRectFromAncestor(root, rect); } // static void View::ConvertPointToWidget(const View* src, gfx::Point* p) { DCHECK(src); DCHECK(p); src->ConvertPointForAncestor(NULL, p); } // static void View::ConvertPointFromWidget(const View* dest, gfx::Point* p) { DCHECK(dest); DCHECK(p); dest->ConvertPointFromAncestor(NULL, p); } // static void View::ConvertPointToScreen(const View* src, gfx::Point* p) { DCHECK(src); DCHECK(p); // If the view is not connected to a tree, there's nothing we can do. const Widget* widget = src->GetWidget(); if (widget) { ConvertPointToWidget(src, p); *p += widget->GetClientAreaBoundsInScreen().OffsetFromOrigin(); } } // static void View::ConvertPointFromScreen(const View* dst, gfx::Point* p) { DCHECK(dst); DCHECK(p); const views::Widget* widget = dst->GetWidget(); if (!widget) return; *p -= widget->GetClientAreaBoundsInScreen().OffsetFromOrigin(); ConvertPointFromWidget(dst, p); } gfx::Rect View::ConvertRectToParent(const gfx::Rect& rect) const { gfx::RectF x_rect = gfx::RectF(rect); GetTransform().TransformRect(&x_rect); x_rect.Offset(GetMirroredPosition().OffsetFromOrigin()); // Pixels we partially occupy in the parent should be included. return gfx::ToEnclosingRect(x_rect); } gfx::Rect View::ConvertRectToWidget(const gfx::Rect& rect) const { gfx::Rect x_rect = rect; for (const View* v = this; v; v = v->parent_) x_rect = v->ConvertRectToParent(x_rect); return x_rect; } // Painting -------------------------------------------------------------------- void View::SchedulePaint() { SchedulePaintInRect(GetLocalBounds()); } void View::SchedulePaintInRect(const gfx::Rect& rect) { if (!visible_) return; if (layer()) { layer()->SchedulePaint(rect); } else if (parent_) { // Translate the requested paint rect to the parent's coordinate system // then pass this notification up to the parent. parent_->SchedulePaintInRect(ConvertRectToParent(rect)); } } void View::Paint(const ui::PaintContext& parent_context) { if (!visible_) return; if (size().IsEmpty()) return; gfx::Vector2d offset_to_parent; if (!layer()) { // If the View has a layer() then it is a paint root. Otherwise, we need to // add the offset from the parent into the total offset from the paint root. DCHECK(parent() || bounds().origin() == gfx::Point()); offset_to_parent = GetMirroredPosition().OffsetFromOrigin(); } ui::PaintContext context(parent_context, offset_to_parent); bool is_invalidated = true; if (context.CanCheckInvalid()) { #if DCHECK_IS_ON() gfx::Vector2d offset; context.Visited(this); View* view = this; while (view->parent() && !view->layer()) { DCHECK(view->GetTransform().IsIdentity()); offset += view->GetMirroredPosition().OffsetFromOrigin(); view = view->parent(); } // The offset in the PaintContext should be the offset up to the paint root, // which we compute and verify here. DCHECK_EQ(context.PaintOffset().x(), offset.x()); DCHECK_EQ(context.PaintOffset().y(), offset.y()); // The above loop will stop when |view| is the paint root, which should be // the root of the current paint walk, as verified by storing the root in // the PaintContext. DCHECK_EQ(context.RootVisited(), view); #endif // If the View wasn't invalidated, don't waste time painting it, the output // would be culled. is_invalidated = context.IsRectInvalid(GetLocalBounds()); } TRACE_EVENT1("views", "View::Paint", "class", GetClassName()); // If the view is backed by a layer, it should paint with itself as the origin // rather than relative to its parent. bool paint_relative_to_parent = !layer(); // TODO(danakj): Rework clip and transform recorder usage here to use // std::optional once we can do so. ui::ClipRecorder clip_recorder(parent_context); if (paint_relative_to_parent) { // Set the clip rect to the bounds of this View, or |clip_path_| if it's // been set. Note that the X (or left) position we pass to ClipRect takes // into consideration whether or not the View uses a right-to-left layout so // that we paint the View in its mirrored position if need be. if (clip_path_.isEmpty()) { clip_recorder.ClipRect(GetMirroredBounds()); } else { gfx::Path clip_path_in_parent = clip_path_; clip_path_in_parent.offset(GetMirroredX(), y()); clip_recorder.ClipPathWithAntiAliasing(clip_path_in_parent); } } ui::TransformRecorder transform_recorder(context); if (paint_relative_to_parent) { // Translate the graphics such that 0,0 corresponds to where // this View is located relative to its parent. gfx::Transform transform_from_parent; gfx::Vector2d offset_from_parent = GetMirroredPosition().OffsetFromOrigin(); transform_from_parent.Translate(offset_from_parent.x(), offset_from_parent.y()); transform_from_parent.PreconcatTransform(GetTransform()); transform_recorder.Transform(transform_from_parent); } // Note that the cache is not aware of the offset of the view // relative to the parent since painting is always done relative to // the top left of the individual view. if (is_invalidated || !paint_cache_.UseCache(context, size())) { ui::PaintRecorder recorder(context, size(), &paint_cache_); gfx::Canvas* canvas = recorder.canvas(); gfx::ScopedRTLFlipCanvas scoped_canvas(canvas, width(), flip_canvas_on_paint_for_rtl_ui_); // Delegate painting the contents of the View to the virtual OnPaint method. OnPaint(canvas); } // View::Paint() recursion over the subtree. PaintChildren(context); } void View::set_background(Background* b) { background_.reset(b); } void View::SetBorder(std::unique_ptr b) { border_ = std::move(b); } const ui::ThemeProvider* View::GetThemeProvider() const { const Widget* widget = GetWidget(); return widget ? widget->GetThemeProvider() : nullptr; } const ui::NativeTheme* View::GetNativeTheme() const { const Widget* widget = GetWidget(); if (widget) return widget->GetNativeTheme(); return ui::NativeTheme::GetInstanceForNativeUi(); } // RTL painting ---------------------------------------------------------------- void View::EnableCanvasFlippingForRTLUI(bool enable) { flip_canvas_on_paint_for_rtl_ui_ = enable; } // Input ----------------------------------------------------------------------- View* View::GetEventHandlerForPoint(const gfx::Point& point) { return GetEventHandlerForRect(gfx::Rect(point, gfx::Size(1, 1))); } View* View::GetEventHandlerForRect(const gfx::Rect& rect) { return GetEffectiveViewTargeter()->TargetForRect(this, rect); } bool View::CanProcessEventsWithinSubtree() const { return true; } View* View::GetTooltipHandlerForPoint(const gfx::Point& point) { // TODO(tdanderson): Move this implementation into ViewTargetDelegate. if (!HitTestPoint(point) || !CanProcessEventsWithinSubtree()) return NULL; // Walk the child Views recursively looking for the View that most // tightly encloses the specified point. for (int i = child_count() - 1; i >= 0; --i) { View* child = child_at(i); if (!child->visible()) continue; gfx::Point point_in_child_coords(point); ConvertPointToTarget(this, child, &point_in_child_coords); View* handler = child->GetTooltipHandlerForPoint(point_in_child_coords); if (handler) return handler; } return this; } gfx::NativeCursor View::GetCursor(const ui::MouseEvent& event) { #if defined(OS_WIN) static ui::Cursor arrow; if (!arrow.platform()) arrow.SetPlatformCursor(LoadCursor(NULL, IDC_ARROW)); return arrow; #else return gfx::kNullCursor; #endif } bool View::HitTestPoint(const gfx::Point& point) const { return HitTestRect(gfx::Rect(point, gfx::Size(1, 1))); } bool View::HitTestRect(const gfx::Rect& rect) const { return GetEffectiveViewTargeter()->DoesIntersectRect(this, rect); } bool View::IsMouseHovered() const { // If we haven't yet been placed in an onscreen view hierarchy, we can't be // hovered. if (!GetWidget()) return false; // If mouse events are disabled, then the mouse cursor is invisible and // is therefore not hovering over this button. if (!GetWidget()->IsMouseEventsEnabled()) return false; gfx::Point cursor_pos(display::Screen::GetScreen()->GetCursorScreenPoint()); ConvertPointFromScreen(this, &cursor_pos); return HitTestPoint(cursor_pos); } bool View::OnMousePressed(const ui::MouseEvent& event) { return false; } bool View::OnMouseDragged(const ui::MouseEvent& event) { return false; } void View::OnMouseReleased(const ui::MouseEvent& event) { } void View::OnMouseCaptureLost() { } void View::OnMouseMoved(const ui::MouseEvent& event) { } void View::OnMouseEntered(const ui::MouseEvent& event) { } void View::OnMouseExited(const ui::MouseEvent& event) { } void View::SetMouseHandler(View* new_mouse_handler) { // |new_mouse_handler| may be NULL. if (parent_) parent_->SetMouseHandler(new_mouse_handler); } bool View::OnKeyPressed(const ui::KeyEvent& event) { return false; } bool View::OnKeyReleased(const ui::KeyEvent& event) { return false; } bool View::OnMouseWheel(const ui::MouseWheelEvent& event) { return false; } void View::OnKeyEvent(ui::KeyEvent* event) { bool consumed = (event->type() == ui::ET_KEY_PRESSED) ? OnKeyPressed(*event) : OnKeyReleased(*event); if (consumed) event->StopPropagation(); } void View::OnMouseEvent(ui::MouseEvent* event) { switch (event->type()) { case ui::ET_MOUSE_PRESSED: if (ProcessMousePressed(*event)) event->SetHandled(); return; case ui::ET_MOUSE_MOVED: if ((event->flags() & (ui::EF_LEFT_MOUSE_BUTTON | ui::EF_RIGHT_MOUSE_BUTTON | ui::EF_MIDDLE_MOUSE_BUTTON)) == 0) { OnMouseMoved(*event); return; } // FALL-THROUGH case ui::ET_MOUSE_DRAGGED: if (ProcessMouseDragged(*event)) event->SetHandled(); return; case ui::ET_MOUSE_RELEASED: ProcessMouseReleased(*event); return; case ui::ET_MOUSEWHEEL: if (OnMouseWheel(*event->AsMouseWheelEvent())) event->SetHandled(); break; case ui::ET_MOUSE_ENTERED: if (event->flags() & ui::EF_TOUCH_ACCESSIBILITY) NotifyAccessibilityEvent(ui::AX_EVENT_HOVER, true); OnMouseEntered(*event); break; case ui::ET_MOUSE_EXITED: OnMouseExited(*event); break; default: return; } } void View::OnScrollEvent(ui::ScrollEvent* event) { } void View::OnTouchEvent(ui::TouchEvent* event) { NOTREACHED() << "Views should not receive touch events."; } void View::OnGestureEvent(ui::GestureEvent* event) { } const ui::InputMethod* View::GetInputMethod() const { Widget* widget = const_cast(GetWidget()); return widget ? const_cast(widget->GetInputMethod()) : nullptr; } std::unique_ptr View::SetEventTargeter( std::unique_ptr targeter) { std::unique_ptr old_targeter = std::move(targeter_); targeter_ = std::move(targeter); return old_targeter; } ViewTargeter* View::GetEffectiveViewTargeter() const { DCHECK(GetWidget()); ViewTargeter* view_targeter = targeter(); if (!view_targeter) view_targeter = GetWidget()->GetRootView()->targeter(); CHECK(view_targeter); return view_targeter; } WordLookupClient* View::GetWordLookupClient() { return nullptr; } bool View::CanAcceptEvent(const ui::Event& event) { return IsDrawn(); } ui::EventTarget* View::GetParentTarget() { return parent_; } std::unique_ptr View::GetChildIterator() const { return base::MakeUnique>(children_); } ui::EventTargeter* View::GetEventTargeter() { return targeter_.get(); } void View::ConvertEventToTarget(ui::EventTarget* target, ui::LocatedEvent* event) { event->ConvertLocationToTarget(this, static_cast(target)); } // Accelerators ---------------------------------------------------------------- void View::AddAccelerator(const ui::Accelerator& accelerator) { if (!accelerators_.get()) accelerators_.reset(new std::vector()); if (!base::ContainsValue(*accelerators_.get(), accelerator)) accelerators_->push_back(accelerator); RegisterPendingAccelerators(); } void View::RemoveAccelerator(const ui::Accelerator& accelerator) { if (!accelerators_.get()) { NOTREACHED() << "Removing non-existing accelerator"; return; } std::vector::iterator i( std::find(accelerators_->begin(), accelerators_->end(), accelerator)); if (i == accelerators_->end()) { NOTREACHED() << "Removing non-existing accelerator"; return; } size_t index = i - accelerators_->begin(); accelerators_->erase(i); if (index >= registered_accelerator_count_) { // The accelerator is not registered to FocusManager. return; } --registered_accelerator_count_; // Providing we are attached to a Widget and registered with a focus manager, // we should de-register from that focus manager now. if (GetWidget() && accelerator_focus_manager_) accelerator_focus_manager_->UnregisterAccelerator(accelerator, this); } void View::ResetAccelerators() { if (accelerators_.get()) UnregisterAccelerators(false); } bool View::AcceleratorPressed(const ui::Accelerator& accelerator) { return false; } bool View::CanHandleAccelerators() const { const Widget* widget = GetWidget(); if (!enabled() || !IsDrawn() || !widget || !widget->IsVisible()) return false; #if defined(USE_AURA) && !defined(OS_CHROMEOS) // Non-ChromeOS aura windows have an associated FocusManagerEventHandler which // adds currently focused view as an event PreTarget (see // DesktopNativeWidgetAura::InitNativeWidget). However, the focused view isn't // always the right view to handle accelerators: It should only handle them // when active. Only top level widgets can be active, so for child widgets // check if they are focused instead. ChromeOS also behaves different than // Linux when an extension popup is about to handle the accelerator. bool child = widget && widget->GetTopLevelWidget() != widget; bool focus_in_child = widget && widget->GetRootView()->Contains(GetFocusManager()->GetFocusedView()); if ((child && !focus_in_child) || (!child && !widget->IsActive())) return false; #endif return true; } // Focus ----------------------------------------------------------------------- bool View::HasFocus() const { const FocusManager* focus_manager = GetFocusManager(); return focus_manager && (focus_manager->GetFocusedView() == this); } View* View::GetNextFocusableView() { return next_focusable_view_; } const View* View::GetNextFocusableView() const { return next_focusable_view_; } View* View::GetPreviousFocusableView() { return previous_focusable_view_; } void View::SetNextFocusableView(View* view) { if (view) view->previous_focusable_view_ = this; next_focusable_view_ = view; } void View::SetFocusBehavior(FocusBehavior focus_behavior) { if (focus_behavior_ == focus_behavior) return; focus_behavior_ = focus_behavior; AdvanceFocusIfNecessary(); } bool View::IsFocusable() const { return focus_behavior_ == FocusBehavior::ALWAYS && enabled_ && IsDrawn(); } bool View::IsAccessibilityFocusable() const { return focus_behavior_ != FocusBehavior::NEVER && enabled_ && IsDrawn(); } FocusManager* View::GetFocusManager() { Widget* widget = GetWidget(); return widget ? widget->GetFocusManager() : NULL; } const FocusManager* View::GetFocusManager() const { const Widget* widget = GetWidget(); return widget ? widget->GetFocusManager() : NULL; } void View::RequestFocus() { FocusManager* focus_manager = GetFocusManager(); if (focus_manager) { bool focusable = focus_manager->keyboard_accessible() ? IsAccessibilityFocusable() : IsFocusable(); if (focusable) focus_manager->SetFocusedView(this); } } bool View::SkipDefaultKeyEventProcessing(const ui::KeyEvent& event) { return false; } FocusTraversable* View::GetFocusTraversable() { return NULL; } FocusTraversable* View::GetPaneFocusTraversable() { return NULL; } // Tooltips -------------------------------------------------------------------- bool View::GetTooltipText(const gfx::Point& p, base::string16* tooltip) const { return false; } bool View::GetTooltipTextOrigin(const gfx::Point& p, gfx::Point* loc) const { return false; } // Context menus --------------------------------------------------------------- void View::ShowContextMenu(const gfx::Point& p, ui::MenuSourceType source_type) { if (!context_menu_controller_) return; context_menu_controller_->ShowContextMenuForView(this, p, source_type); } // static bool View::ShouldShowContextMenuOnMousePress() { return kContextMenuOnMousePress; } gfx::Point View::GetKeyboardContextMenuLocation() { gfx::Rect vis_bounds = GetVisibleBounds(); gfx::Point screen_point(vis_bounds.x() + vis_bounds.width() / 2, vis_bounds.y() + vis_bounds.height() / 2); ConvertPointToScreen(this, &screen_point); return screen_point; } // Drag and drop --------------------------------------------------------------- bool View::GetDropFormats(int* formats, std::set* format_types) { return false; } bool View::AreDropTypesRequired() { return false; } bool View::CanDrop(const OSExchangeData& data) { // TODO(sky): when I finish up migration, this should default to true. return false; } void View::OnDragEntered(const ui::DropTargetEvent& event) { } int View::OnDragUpdated(const ui::DropTargetEvent& event) { return ui::DragDropTypes::DRAG_NONE; } void View::OnDragExited() { } int View::OnPerformDrop(const ui::DropTargetEvent& event) { return ui::DragDropTypes::DRAG_NONE; } void View::OnDragDone() { } // static bool View::ExceededDragThreshold(const gfx::Vector2d& delta) { return (abs(delta.x()) > GetHorizontalDragThreshold() || abs(delta.y()) > GetVerticalDragThreshold()); } // Accessibility---------------------------------------------------------------- bool View::HandleAccessibleAction(const ui::AXActionData& action_data) { return false; } gfx::NativeViewAccessible View::GetNativeViewAccessible() { if (!native_view_accessibility_) native_view_accessibility_ = NativeViewAccessibility::Create(this); if (native_view_accessibility_) return native_view_accessibility_->GetNativeObject(); return NULL; } void View::NotifyAccessibilityEvent( ui::AXEvent event_type, bool send_native_event) { if (ViewsDelegate::GetInstance()) ViewsDelegate::GetInstance()->NotifyAccessibilityEvent(this, event_type); if (send_native_event && GetWidget()) { if (!native_view_accessibility_) native_view_accessibility_ = NativeViewAccessibility::Create(this); if (native_view_accessibility_) native_view_accessibility_->NotifyAccessibilityEvent(event_type); } } // Scrolling ------------------------------------------------------------------- void View::ScrollRectToVisible(const gfx::Rect& rect) { // We must take RTL UI mirroring into account when adjusting the position of // the region. if (parent_) { gfx::Rect scroll_rect(rect); scroll_rect.Offset(GetMirroredX(), y()); parent_->ScrollRectToVisible(scroll_rect); } } int View::GetPageScrollIncrement(ScrollView* scroll_view, bool is_horizontal, bool is_positive) { return 0; } int View::GetLineScrollIncrement(ScrollView* scroll_view, bool is_horizontal, bool is_positive) { return 0; } //////////////////////////////////////////////////////////////////////////////// // View, protected: // Size and disposition -------------------------------------------------------- void View::OnBoundsChanged(const gfx::Rect& previous_bounds) { } void View::PreferredSizeChanged() { InvalidateLayout(); if (parent_) parent_->ChildPreferredSizeChanged(this); } bool View::GetNeedsNotificationWhenVisibleBoundsChange() const { return false; } void View::OnVisibleBoundsChanged() { } // Tree operations ------------------------------------------------------------- void View::ViewHierarchyChanged(const ViewHierarchyChangedDetails& details) { } void View::VisibilityChanged(View* starting_from, bool is_visible) { } void View::NativeViewHierarchyChanged() { FocusManager* focus_manager = GetFocusManager(); if (accelerator_focus_manager_ != focus_manager) { UnregisterAccelerators(true); if (focus_manager) RegisterPendingAccelerators(); } } // Painting -------------------------------------------------------------------- void View::PaintChildren(const ui::PaintContext& context) { TRACE_EVENT1("views", "View::PaintChildren", "class", GetClassName()); for (int i = 0, count = child_count(); i < count; ++i) if (!child_at(i)->layer()) child_at(i)->Paint(context); } void View::OnPaint(gfx::Canvas* canvas) { TRACE_EVENT1("views", "View::OnPaint", "class", GetClassName()); OnPaintBackground(canvas); OnPaintBorder(canvas); } void View::OnPaintBackground(gfx::Canvas* canvas) { if (background_.get()) { TRACE_EVENT2("views", "View::OnPaintBackground", "width", canvas->sk_canvas()->getBaseLayerSize().width(), "height", canvas->sk_canvas()->getBaseLayerSize().height()); background_->Paint(canvas, this); } } void View::OnPaintBorder(gfx::Canvas* canvas) { if (border_.get()) { TRACE_EVENT2("views", "View::OnPaintBorder", "width", canvas->sk_canvas()->getBaseLayerSize().width(), "height", canvas->sk_canvas()->getBaseLayerSize().height()); border_->Paint(*this, canvas); } } // Accelerated Painting -------------------------------------------------------- gfx::Vector2d View::CalculateOffsetToAncestorWithLayer( ui::Layer** layer_parent) { if (layer()) { if (layer_parent) *layer_parent = layer(); return gfx::Vector2d(); } if (!parent_) return gfx::Vector2d(); return gfx::Vector2d(GetMirroredX(), y()) + parent_->CalculateOffsetToAncestorWithLayer(layer_parent); } void View::UpdateParentLayer() { if (!layer()) return; ui::Layer* parent_layer = NULL; gfx::Vector2d offset(GetMirroredX(), y()); if (parent_) offset += parent_->CalculateOffsetToAncestorWithLayer(&parent_layer); ReparentLayer(offset, parent_layer); } void View::MoveLayerToParent(ui::Layer* parent_layer, const gfx::Point& point) { gfx::Point local_point(point); if (parent_layer != layer()) local_point.Offset(GetMirroredX(), y()); if (layer() && parent_layer != layer()) { parent_layer->Add(layer()); SetLayerBounds(gfx::Rect(local_point.x(), local_point.y(), width(), height())); } else { for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->MoveLayerToParent(parent_layer, local_point); } } void View::UpdateLayerVisibility() { bool visible = visible_; for (const View* v = parent_; visible && v && !v->layer(); v = v->parent_) visible = v->visible(); UpdateChildLayerVisibility(visible); } void View::UpdateChildLayerVisibility(bool ancestor_visible) { if (layer()) { layer()->SetVisible(ancestor_visible && visible_); } else { for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->UpdateChildLayerVisibility(ancestor_visible && visible_); } } void View::UpdateChildLayerBounds(const gfx::Vector2d& offset) { if (layer()) { SetLayerBounds(GetLocalBounds() + offset); } else { for (int i = 0, count = child_count(); i < count; ++i) { View* child = child_at(i); child->UpdateChildLayerBounds( offset + gfx::Vector2d(child->GetMirroredX(), child->y())); } } } void View::OnPaintLayer(const ui::PaintContext& context) { Paint(context); } void View::OnDelegatedFrameDamage( const gfx::Rect& damage_rect_in_dip) { } void View::OnDeviceScaleFactorChanged(float device_scale_factor) { snap_layer_to_pixel_boundary_ = (device_scale_factor - std::floor(device_scale_factor)) != 0.0f; SnapLayerToPixelBoundary(); // Repainting with new scale factor will paint the content at the right scale. } void View::ReorderLayers() { View* v = this; while (v && !v->layer()) v = v->parent(); Widget* widget = GetWidget(); if (!v) { if (widget) { ui::Layer* layer = widget->GetLayer(); if (layer) widget->GetRootView()->ReorderChildLayers(layer); } } else { v->ReorderChildLayers(v->layer()); } if (widget) { // Reorder the widget's child NativeViews in case a child NativeView is // associated with a view (eg via a NativeViewHost). Always do the // reordering because the associated NativeView's layer (if it has one) // is parented to the widget's layer regardless of whether the host view has // an ancestor with a layer. widget->ReorderNativeViews(); } } void View::ReorderChildLayers(ui::Layer* parent_layer) { if (layer() && layer() != parent_layer) { DCHECK_EQ(parent_layer, layer()->parent()); parent_layer->StackAtBottom(layer()); } else { // Iterate backwards through the children so that a child with a layer // which is further to the back is stacked above one which is further to // the front. for (Views::reverse_iterator it(children_.rbegin()); it != children_.rend(); ++it) { (*it)->ReorderChildLayers(parent_layer); } } } // Input ----------------------------------------------------------------------- View::DragInfo* View::GetDragInfo() { return parent_ ? parent_->GetDragInfo() : NULL; } // Focus ----------------------------------------------------------------------- void View::OnFocus() { // TODO(beng): Investigate whether it's possible for us to move this to // Focus(). // By default, we clear the native focus. This ensures that no visible native // view as the focus and that we still receive keyboard inputs. FocusManager* focus_manager = GetFocusManager(); if (focus_manager) focus_manager->ClearNativeFocus(); // TODO(beng): Investigate whether it's possible for us to move this to // Focus(). // Notify assistive technologies of the focus change. NotifyAccessibilityEvent(ui::AX_EVENT_FOCUS, true); } void View::OnBlur() { } void View::Focus() { OnFocus(); } void View::Blur() { OnBlur(); } // Tooltips -------------------------------------------------------------------- void View::TooltipTextChanged() { Widget* widget = GetWidget(); // TooltipManager may be null if there is a problem creating it. if (widget && widget->GetTooltipManager()) widget->GetTooltipManager()->TooltipTextChanged(this); } // Drag and drop --------------------------------------------------------------- int View::GetDragOperations(const gfx::Point& press_pt) { return drag_controller_ ? drag_controller_->GetDragOperationsForView(this, press_pt) : ui::DragDropTypes::DRAG_NONE; } void View::WriteDragData(const gfx::Point& press_pt, OSExchangeData* data) { DCHECK(drag_controller_); drag_controller_->WriteDragDataForView(this, press_pt, data); } bool View::InDrag() const { const Widget* widget = GetWidget(); return widget ? widget->dragged_view() == this : false; } int View::GetHorizontalDragThreshold() { // TODO(jennyz): This value may need to be adjusted for different platforms // and for different display density. return kDefaultHorizontalDragThreshold; } int View::GetVerticalDragThreshold() { // TODO(jennyz): This value may need to be adjusted for different platforms // and for different display density. return kDefaultVerticalDragThreshold; } // Debugging ------------------------------------------------------------------- #if !defined(NDEBUG) std::string View::PrintViewGraph(bool first) { return DoPrintViewGraph(first, this); } std::string View::DoPrintViewGraph(bool first, View* view_with_children) { // 64-bit pointer = 16 bytes of hex + "0x" + '\0' = 19. const size_t kMaxPointerStringLength = 19; std::string result; if (first) result.append("digraph {\n"); // Node characteristics. char p[kMaxPointerStringLength]; const std::string class_name(GetClassName()); size_t base_name_index = class_name.find_last_of('/'); if (base_name_index == std::string::npos) base_name_index = 0; else base_name_index++; char bounds_buffer[512]; // Information about current node. base::snprintf(p, arraysize(bounds_buffer), "%p", view_with_children); result.append(" N"); result.append(p + 2); result.append(" [label=\""); result.append(class_name.substr(base_name_index).c_str()); base::snprintf(bounds_buffer, arraysize(bounds_buffer), "\\n bounds: (%d, %d), (%dx%d)", bounds().x(), bounds().y(), bounds().width(), bounds().height()); result.append(bounds_buffer); gfx::DecomposedTransform decomp; if (!GetTransform().IsIdentity() && gfx::DecomposeTransform(&decomp, GetTransform())) { base::snprintf(bounds_buffer, arraysize(bounds_buffer), "\\n translation: (%f, %f)", decomp.translate[0], decomp.translate[1]); result.append(bounds_buffer); base::snprintf(bounds_buffer, arraysize(bounds_buffer), "\\n rotation: %3.2f", std::acos(decomp.quaternion[3]) * 360.0 / M_PI); result.append(bounds_buffer); base::snprintf(bounds_buffer, arraysize(bounds_buffer), "\\n scale: (%2.4f, %2.4f)", decomp.scale[0], decomp.scale[1]); result.append(bounds_buffer); } result.append("\""); if (!parent_) result.append(", shape=box"); if (layer()) { if (layer()->has_external_content()) result.append(", color=green"); else result.append(", color=red"); if (layer()->fills_bounds_opaquely()) result.append(", style=filled"); } result.append("]\n"); // Link to parent. if (parent_) { char pp[kMaxPointerStringLength]; base::snprintf(pp, kMaxPointerStringLength, "%p", parent_); result.append(" N"); result.append(pp + 2); result.append(" -> N"); result.append(p + 2); result.append("\n"); } // Children. for (int i = 0, count = view_with_children->child_count(); i < count; ++i) result.append(view_with_children->child_at(i)->PrintViewGraph(false)); if (first) result.append("}\n"); return result; } #endif //////////////////////////////////////////////////////////////////////////////// // View, private: // DropInfo -------------------------------------------------------------------- void View::DragInfo::Reset() { possible_drag = false; start_pt = gfx::Point(); } void View::DragInfo::PossibleDrag(const gfx::Point& p) { possible_drag = true; start_pt = p; } // Painting -------------------------------------------------------------------- void View::SchedulePaintBoundsChanged(SchedulePaintType type) { // If we have a layer and the View's size did not change, we do not need to // schedule any paints since the layer will be redrawn at its new location // during the next Draw() cycle in the compositor. if (!layer() || type == SCHEDULE_PAINT_SIZE_CHANGED) { // Otherwise, if the size changes or we don't have a layer then we need to // use SchedulePaint to invalidate the area occupied by the View. SchedulePaint(); } else if (parent_ && type == SCHEDULE_PAINT_SIZE_SAME) { // The compositor doesn't Draw() until something on screen changes, so // if our position changes but nothing is being animated on screen, then // tell the compositor to redraw the scene. We know layer() exists due to // the above if clause. layer()->ScheduleDraw(); } } void View::SchedulePaintOnParent() { if (parent_) { // Translate the requested paint rect to the parent's coordinate system // then pass this notification up to the parent. parent_->SchedulePaintInRect(ConvertRectToParent(GetLocalBounds())); } } // Tree operations ------------------------------------------------------------- void View::DoRemoveChildView(View* view, bool update_focus_cycle, bool update_tool_tip, bool delete_removed_view, View* new_parent) { DCHECK(view); const Views::iterator i(std::find(children_.begin(), children_.end(), view)); if (i == children_.end()) return; std::unique_ptr view_to_be_deleted; if (update_focus_cycle) { View* next_focusable = view->next_focusable_view_; View* prev_focusable = view->previous_focusable_view_; if (prev_focusable) prev_focusable->next_focusable_view_ = next_focusable; if (next_focusable) next_focusable->previous_focusable_view_ = prev_focusable; } Widget* widget = GetWidget(); if (widget) { UnregisterChildrenForVisibleBoundsNotification(view); if (view->visible()) view->SchedulePaint(); if (!new_parent || new_parent->GetWidget() != widget) widget->NotifyWillRemoveView(view); } // Make sure the layers belonging to the subtree rooted at |view| get // removed. view->OrphanLayers(); if (widget) widget->UpdateRootLayers(); view->PropagateRemoveNotifications(this, new_parent); view->parent_ = nullptr; if (delete_removed_view && !view->owned_by_client_) view_to_be_deleted.reset(view); children_.erase(i); if (update_tool_tip) UpdateTooltip(); if (layout_manager_) layout_manager_->ViewRemoved(this, view); } void View::PropagateRemoveNotifications(View* old_parent, View* new_parent) { for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->PropagateRemoveNotifications(old_parent, new_parent); ViewHierarchyChangedDetails details(false, old_parent, this, new_parent); for (View* v = this; v; v = v->parent_) v->ViewHierarchyChangedImpl(true, details); } void View::PropagateAddNotifications( const ViewHierarchyChangedDetails& details) { for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->PropagateAddNotifications(details); ViewHierarchyChangedImpl(true, details); } void View::PropagateNativeViewHierarchyChanged() { for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->PropagateNativeViewHierarchyChanged(); NativeViewHierarchyChanged(); } void View::ViewHierarchyChangedImpl( bool register_accelerators, const ViewHierarchyChangedDetails& details) { if (register_accelerators) { if (details.is_add) { // If you get this registration, you are part of a subtree that has been // added to the view hierarchy. if (GetFocusManager()) RegisterPendingAccelerators(); } else { if (details.child == this) UnregisterAccelerators(true); } } ViewHierarchyChanged(details); details.parent->needs_layout_ = true; } void View::PropagateNativeThemeChanged(const ui::NativeTheme* theme) { for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->PropagateNativeThemeChanged(theme); OnNativeThemeChanged(theme); } // Size and disposition -------------------------------------------------------- void View::PropagateVisibilityNotifications(View* start, bool is_visible) { for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->PropagateVisibilityNotifications(start, is_visible); VisibilityChangedImpl(start, is_visible); } void View::VisibilityChangedImpl(View* starting_from, bool is_visible) { VisibilityChanged(starting_from, is_visible); } void View::BoundsChanged(const gfx::Rect& previous_bounds) { if (visible_) { // Paint the new bounds. SchedulePaintBoundsChanged( bounds_.size() == previous_bounds.size() ? SCHEDULE_PAINT_SIZE_SAME : SCHEDULE_PAINT_SIZE_CHANGED); } if (layer()) { if (parent_) { SetLayerBounds(GetLocalBounds() + gfx::Vector2d(GetMirroredX(), y()) + parent_->CalculateOffsetToAncestorWithLayer(NULL)); } else { SetLayerBounds(bounds_); } // In RTL mode, if our width has changed, our children's mirrored bounds // will have changed. Update the child's layer bounds, or if it is not a // layer, the bounds of any layers inside the child. if (base::i18n::IsRTL() && bounds_.width() != previous_bounds.width()) { for (int i = 0; i < child_count(); ++i) { View* child = child_at(i); child->UpdateChildLayerBounds( gfx::Vector2d(child->GetMirroredX(), child->y())); } } } else { // If our bounds have changed, then any descendant layer bounds may have // changed. Update them accordingly. UpdateChildLayerBounds(CalculateOffsetToAncestorWithLayer(NULL)); } OnBoundsChanged(previous_bounds); if (needs_layout_ || previous_bounds.size() != size()) { needs_layout_ = false; Layout(); } if (GetNeedsNotificationWhenVisibleBoundsChange()) OnVisibleBoundsChanged(); // Notify interested Views that visible bounds within the root view may have // changed. if (descendants_to_notify_.get()) { for (Views::iterator i(descendants_to_notify_->begin()); i != descendants_to_notify_->end(); ++i) { (*i)->OnVisibleBoundsChanged(); } } } // static void View::RegisterChildrenForVisibleBoundsNotification(View* view) { if (view->GetNeedsNotificationWhenVisibleBoundsChange()) view->RegisterForVisibleBoundsNotification(); for (int i = 0; i < view->child_count(); ++i) RegisterChildrenForVisibleBoundsNotification(view->child_at(i)); } // static void View::UnregisterChildrenForVisibleBoundsNotification(View* view) { if (view->GetNeedsNotificationWhenVisibleBoundsChange()) view->UnregisterForVisibleBoundsNotification(); for (int i = 0; i < view->child_count(); ++i) UnregisterChildrenForVisibleBoundsNotification(view->child_at(i)); } void View::RegisterForVisibleBoundsNotification() { if (registered_for_visible_bounds_notification_) return; registered_for_visible_bounds_notification_ = true; for (View* ancestor = parent_; ancestor; ancestor = ancestor->parent_) ancestor->AddDescendantToNotify(this); } void View::UnregisterForVisibleBoundsNotification() { if (!registered_for_visible_bounds_notification_) return; registered_for_visible_bounds_notification_ = false; for (View* ancestor = parent_; ancestor; ancestor = ancestor->parent_) ancestor->RemoveDescendantToNotify(this); } void View::AddDescendantToNotify(View* view) { DCHECK(view); if (!descendants_to_notify_.get()) descendants_to_notify_.reset(new Views); descendants_to_notify_->push_back(view); } void View::RemoveDescendantToNotify(View* view) { DCHECK(view && descendants_to_notify_.get()); Views::iterator i(std::find( descendants_to_notify_->begin(), descendants_to_notify_->end(), view)); DCHECK(i != descendants_to_notify_->end()); descendants_to_notify_->erase(i); if (descendants_to_notify_->empty()) descendants_to_notify_.reset(); } void View::SetLayerBounds(const gfx::Rect& bounds) { layer()->SetBounds(bounds); SnapLayerToPixelBoundary(); } // Transformations ------------------------------------------------------------- bool View::GetTransformRelativeTo(const View* ancestor, gfx::Transform* transform) const { const View* p = this; while (p && p != ancestor) { transform->ConcatTransform(p->GetTransform()); gfx::Transform translation; translation.Translate(static_cast(p->GetMirroredX()), static_cast(p->y())); transform->ConcatTransform(translation); p = p->parent_; } return p == ancestor; } // Coordinate conversion ------------------------------------------------------- bool View::ConvertPointForAncestor(const View* ancestor, gfx::Point* point) const { gfx::Transform trans; // TODO(sad): Have some way of caching the transformation results. bool result = GetTransformRelativeTo(ancestor, &trans); auto p = gfx::Point3F(gfx::PointF(*point)); trans.TransformPoint(&p); *point = gfx::ToFlooredPoint(p.AsPointF()); return result; } bool View::ConvertPointFromAncestor(const View* ancestor, gfx::Point* point) const { gfx::Transform trans; bool result = GetTransformRelativeTo(ancestor, &trans); auto p = gfx::Point3F(gfx::PointF(*point)); trans.TransformPointReverse(&p); *point = gfx::ToFlooredPoint(p.AsPointF()); return result; } bool View::ConvertRectForAncestor(const View* ancestor, gfx::RectF* rect) const { gfx::Transform trans; // TODO(sad): Have some way of caching the transformation results. bool result = GetTransformRelativeTo(ancestor, &trans); trans.TransformRect(rect); return result; } bool View::ConvertRectFromAncestor(const View* ancestor, gfx::RectF* rect) const { gfx::Transform trans; bool result = GetTransformRelativeTo(ancestor, &trans); trans.TransformRectReverse(rect); return result; } // Accelerated painting -------------------------------------------------------- void View::CreateLayer() { // A new layer is being created for the view. So all the layers of the // sub-tree can inherit the visibility of the corresponding view. for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->UpdateChildLayerVisibility(true); SetLayer(base::MakeUnique()); layer()->set_delegate(this); layer()->set_name(GetClassName()); UpdateParentLayers(); UpdateLayerVisibility(); // The new layer needs to be ordered in the layer tree according // to the view tree. Children of this layer were added in order // in UpdateParentLayers(). if (parent()) parent()->ReorderLayers(); Widget* widget = GetWidget(); if (widget) widget->UpdateRootLayers(); // Before having its own Layer, this View may have painted in to a Layer owned // by an ancestor View. Scheduling a paint on the parent View will erase this // View's painting effects on the ancestor View's Layer. // (See crbug.com/551492) SchedulePaintOnParent(); } bool View::UpdateParentLayers() { // Attach all top-level un-parented layers. if (layer()) { if (!layer()->parent()) { UpdateParentLayer(); return true; } // The layers of any child views are already in place, so we can stop // iterating here. return false; } bool result = false; for (int i = 0, count = child_count(); i < count; ++i) { if (child_at(i)->UpdateParentLayers()) result = true; } return result; } void View::OrphanLayers() { if (layer()) { if (layer()->parent()) layer()->parent()->Remove(layer()); // The layer belonging to this View has already been orphaned. It is not // necessary to orphan the child layers. return; } for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->OrphanLayers(); } void View::ReparentLayer(const gfx::Vector2d& offset, ui::Layer* parent_layer) { layer()->SetBounds(GetLocalBounds() + offset); DCHECK_NE(layer(), parent_layer); if (parent_layer) parent_layer->Add(layer()); layer()->SchedulePaint(GetLocalBounds()); MoveLayerToParent(layer(), gfx::Point()); } void View::DestroyLayer() { ui::Layer* new_parent = layer()->parent(); std::vector children = layer()->children(); for (size_t i = 0; i < children.size(); ++i) { layer()->Remove(children[i]); if (new_parent) new_parent->Add(children[i]); } LayerOwner::DestroyLayer(); if (new_parent) ReorderLayers(); UpdateChildLayerBounds(CalculateOffsetToAncestorWithLayer(NULL)); SchedulePaint(); Widget* widget = GetWidget(); if (widget) widget->UpdateRootLayers(); } // Input ----------------------------------------------------------------------- bool View::ProcessMousePressed(const ui::MouseEvent& event) { int drag_operations = (enabled_ && event.IsOnlyLeftMouseButton() && HitTestPoint(event.location())) ? GetDragOperations(event.location()) : 0; ContextMenuController* context_menu_controller = event.IsRightMouseButton() ? context_menu_controller_ : 0; View::DragInfo* drag_info = GetDragInfo(); // TODO(sky): for debugging 360238. int storage_id = 0; if (event.IsOnlyRightMouseButton() && context_menu_controller && kContextMenuOnMousePress && HitTestPoint(event.location())) { ViewStorage* view_storage = ViewStorage::GetInstance(); storage_id = view_storage->CreateStorageID(); view_storage->StoreView(storage_id, this); } const bool enabled = enabled_; const bool result = OnMousePressed(event); if (!enabled) return result; if (event.IsOnlyRightMouseButton() && context_menu_controller && kContextMenuOnMousePress) { // Assume that if there is a context menu controller we won't be deleted // from mouse pressed. gfx::Point location(event.location()); if (HitTestPoint(location)) { if (storage_id != 0) CHECK_EQ(this, ViewStorage::GetInstance()->RetrieveView(storage_id)); ConvertPointToScreen(this, &location); ShowContextMenu(location, ui::MENU_SOURCE_MOUSE); return true; } } // WARNING: we may have been deleted, don't use any View variables. if (drag_operations != ui::DragDropTypes::DRAG_NONE) { drag_info->PossibleDrag(event.location()); return true; } return !!context_menu_controller || result; } bool View::ProcessMouseDragged(const ui::MouseEvent& event) { // Copy the field, that way if we're deleted after drag and drop no harm is // done. ContextMenuController* context_menu_controller = context_menu_controller_; const bool possible_drag = GetDragInfo()->possible_drag; if (possible_drag && ExceededDragThreshold(GetDragInfo()->start_pt - event.location()) && (!drag_controller_ || drag_controller_->CanStartDragForView( this, GetDragInfo()->start_pt, event.location()))) { DoDrag(event, GetDragInfo()->start_pt, ui::DragDropTypes::DRAG_EVENT_SOURCE_MOUSE); } else { if (OnMouseDragged(event)) return true; // Fall through to return value based on context menu controller. } // WARNING: we may have been deleted. return (context_menu_controller != NULL) || possible_drag; } void View::ProcessMouseReleased(const ui::MouseEvent& event) { if (!kContextMenuOnMousePress && context_menu_controller_ && event.IsOnlyRightMouseButton()) { // Assume that if there is a context menu controller we won't be deleted // from mouse released. gfx::Point location(event.location()); OnMouseReleased(event); if (HitTestPoint(location)) { ConvertPointToScreen(this, &location); ShowContextMenu(location, ui::MENU_SOURCE_MOUSE); } } else { OnMouseReleased(event); } // WARNING: we may have been deleted. } // Accelerators ---------------------------------------------------------------- void View::RegisterPendingAccelerators() { if (!accelerators_.get() || registered_accelerator_count_ == accelerators_->size()) { // No accelerators are waiting for registration. return; } if (!GetWidget()) { // The view is not yet attached to a widget, defer registration until then. return; } accelerator_focus_manager_ = GetFocusManager(); if (!accelerator_focus_manager_) { // Some crash reports seem to show that we may get cases where we have no // focus manager (see bug #1291225). This should never be the case, just // making sure we don't crash. NOTREACHED(); return; } for (std::vector::const_iterator i( accelerators_->begin() + registered_accelerator_count_); i != accelerators_->end(); ++i) { accelerator_focus_manager_->RegisterAccelerator( *i, ui::AcceleratorManager::kNormalPriority, this); } registered_accelerator_count_ = accelerators_->size(); } void View::UnregisterAccelerators(bool leave_data_intact) { if (!accelerators_.get()) return; if (GetWidget()) { if (accelerator_focus_manager_) { accelerator_focus_manager_->UnregisterAccelerators(this); accelerator_focus_manager_ = NULL; } if (!leave_data_intact) { accelerators_->clear(); accelerators_.reset(); } registered_accelerator_count_ = 0; } } // Focus ----------------------------------------------------------------------- void View::InitFocusSiblings(View* v, int index) { int count = child_count(); if (count == 0) { v->next_focusable_view_ = NULL; v->previous_focusable_view_ = NULL; } else { if (index == count) { // We are inserting at the end, but the end of the child list may not be // the last focusable element. Let's try to find an element with no next // focusable element to link to. View* last_focusable_view = NULL; for (Views::iterator i(children_.begin()); i != children_.end(); ++i) { if (!(*i)->next_focusable_view_) { last_focusable_view = *i; break; } } if (last_focusable_view == NULL) { // Hum... there is a cycle in the focus list. Let's just insert ourself // after the last child. View* prev = children_[index - 1]; v->previous_focusable_view_ = prev; v->next_focusable_view_ = prev->next_focusable_view_; prev->next_focusable_view_->previous_focusable_view_ = v; prev->next_focusable_view_ = v; } else { last_focusable_view->next_focusable_view_ = v; v->next_focusable_view_ = NULL; v->previous_focusable_view_ = last_focusable_view; } } else { View* prev = children_[index]->GetPreviousFocusableView(); v->previous_focusable_view_ = prev; v->next_focusable_view_ = children_[index]; if (prev) prev->next_focusable_view_ = v; children_[index]->previous_focusable_view_ = v; } } } void View::AdvanceFocusIfNecessary() { // Focus should only be advanced if this is the focused view and has become // unfocusable. If the view is still focusable or is not focused, we can // return early avoiding furthur unnecessary checks. Focusability check is // performed first as it tends to be faster. if (IsAccessibilityFocusable() || !HasFocus()) return; FocusManager* focus_manager = GetFocusManager(); if (focus_manager) focus_manager->AdvanceFocusIfNecessary(); } // System events --------------------------------------------------------------- void View::PropagateThemeChanged() { for (int i = child_count() - 1; i >= 0; --i) child_at(i)->PropagateThemeChanged(); OnThemeChanged(); } void View::PropagateLocaleChanged() { for (int i = child_count() - 1; i >= 0; --i) child_at(i)->PropagateLocaleChanged(); OnLocaleChanged(); } void View::PropagateDeviceScaleFactorChanged(float device_scale_factor) { for (int i = child_count() - 1; i >= 0; --i) child_at(i)->PropagateDeviceScaleFactorChanged(device_scale_factor); // If the view is drawing to the layer, OnDeviceScaleFactorChanged() is called // through LayerDelegate callback. if (!layer()) OnDeviceScaleFactorChanged(device_scale_factor); } // Tooltips -------------------------------------------------------------------- void View::UpdateTooltip() { Widget* widget = GetWidget(); // TODO(beng): The TooltipManager NULL check can be removed when we // consolidate Init() methods and make views_unittests Init() all // Widgets that it uses. if (widget && widget->GetTooltipManager()) widget->GetTooltipManager()->UpdateTooltip(); } // Drag and drop --------------------------------------------------------------- bool View::DoDrag(const ui::LocatedEvent& event, const gfx::Point& press_pt, ui::DragDropTypes::DragEventSource source) { int drag_operations = GetDragOperations(press_pt); if (drag_operations == ui::DragDropTypes::DRAG_NONE) return false; Widget* widget = GetWidget(); // We should only start a drag from an event, implying we have a widget. DCHECK(widget); // Don't attempt to start a drag while in the process of dragging. This is // especially important on X where we can get multiple mouse move events when // we start the drag. if (widget->dragged_view()) return false; OSExchangeData data; WriteDragData(press_pt, &data); // Message the RootView to do the drag and drop. That way if we're removed // the RootView can detect it and avoid calling us back. gfx::Point widget_location(event.location()); ConvertPointToWidget(this, &widget_location); widget->RunShellDrag(this, data, widget_location, drag_operations, source); // WARNING: we may have been deleted. return true; } } // namespace views