//----------------------------------------------------------------------------- // Name: objref.cpp // Purpose: XML resources sample: Object references and ID ranges dialog // Author: David Hart, Vaclav Slavik // Copyright: (c) Vaclav Slavik // Licence: wxWindows licence //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- // Standard wxWidgets headers //----------------------------------------------------------------------------- // For compilers that support precompilation, includes "wx/wx.h". #include "wx/wxprec.h" #ifdef __BORLANDC__ #pragma hdrstop #endif // For all others, include the necessary headers (this file is usually all you // need because it includes almost all "standard" wxWidgets headers) #ifndef WX_PRECOMP #include "wx/wx.h" #endif //----------------------------------------------------------------------------- // Header of this .cpp file //----------------------------------------------------------------------------- #include "objrefdlg.h" //----------------------------------------------------------------------------- // Needed wx headers, //----------------------------------------------------------------------------- #include "wx/xrc/xmlres.h" // XRC XML resouces //----------------------------------------------------------------------------- // Public members //----------------------------------------------------------------------------- ObjrefDialog::ObjrefDialog(wxWindow* parent) { wxXmlResource::Get()->LoadDialog(this, parent, wxT("objref_dialog")); nb = XRCCTRL(*this, "objref_notebook", wxNotebook); wxCHECK_RET(nb, "failed to find objref_notebook"); // Connect different event handlers. nb->Connect(wxEVT_NOTEBOOK_PAGE_CHANGED, wxNotebookEventHandler(ObjrefDialog::OnNotebookPageChanged), NULL, this); // We want to direct UpdateUI events for the ID range 'first_row' to // OnUpdateUIFirst(). We could achieve this using first_row[0] and // first_row[2], but what if a fourth column were added? It's safer to use // the 'typedefs' for the two ends of the range: wxNotebookPage *page = nb->GetPage(icons_page); page->Connect(XRCID("first_row[start]"), XRCID("first_row[end]"), wxEVT_UPDATE_UI, wxUpdateUIEventHandler(ObjrefDialog::OnUpdateUIFirst), NULL, this); page->Connect(XRCID("second_row[start]"), XRCID("second_row[end]"), wxEVT_UPDATE_UI, wxUpdateUIEventHandler(ObjrefDialog::OnUpdateUISecond), NULL, this); page->Connect(XRCID("third_row[start]"), XRCID("third_row[end]"), wxEVT_UPDATE_UI, wxUpdateUIEventHandler(ObjrefDialog::OnUpdateUIThird), NULL, this); // Connect the id ranges, using the [start] and [end] 'typedefs' page = nb->GetPage(calc_page); page->Connect(XRCID("digits[start]"), XRCID("digits[end]"), wxEVT_BUTTON, wxCommandEventHandler(ObjrefDialog::OnNumeralClick), NULL, this); page->Connect(XRCID("operators[start]"), XRCID("operators[end]"), wxEVT_BUTTON, wxCommandEventHandler(ObjrefDialog::OnOperatorClick), NULL, this); } ObjrefDialog::~ObjrefDialog() { // Select page 0. Otherwise if the Calc page were selected, when it's // removed the Icons page is selected and sets the log target again in idle // time, *after* myframe restores the old one! nb->ChangeSelection(0); } //----------------------------------------------------------------------------- // Private members (including the event handlers) //----------------------------------------------------------------------------- void ObjrefDialog::OnNotebookPageChanged( wxNotebookEvent &event ) { switch(event.GetSelection()) { case copy_page: { // This is a straight object reference to the first page // so change the text programmatically nb->SetPageText(copy_page, "Page 1 copy"); wxNotebookPage *page = nb->GetPage(copy_page); wxTextCtrl * text = XRCCTRL(*page, "description_text", wxTextCtrl); text->ChangeValue( "This is a duplicate of page 1, using an object reference. " "It was created by this very simple xml:\n\n" "\n\t\n" "\t\n" "\n\n(Then I'm cheating by inserting this text programmatically.)" ); break; } case icons_page: { wxNotebookPage *page = nb->GetPage(icons_page); text = XRCCTRL(*page, "log_text", wxTextCtrl); if (text) delete wxLog::SetActiveTarget(new wxLogTextCtrl(text)); break; } case calc_page: { wxNotebookPage *page = nb->GetPage(calc_page); result_txt = XRCCTRL(*page, "result", wxTextCtrl); text = XRCCTRL(*page, "log_text", wxTextCtrl); if (text) delete wxLog::SetActiveTarget(new wxLogTextCtrl(text)); ClearCalculator(); break; } } } // There are undoubtedly simpler ways of doing all this, but we're // demonstrating the use of ID ranges void ObjrefDialog::OnUpdateUIFirst(wxUpdateUIEvent& event) { // The checkbox with the XRCID 'check[0]' controls this row of icons wxCheckBox * chk = XRCCTRL(*(nb->GetPage(icons_page)), "check[0]", wxCheckBox); if (chk) event.Enable(chk->IsChecked()); // Let's create a log-window entry static bool checked = true; if (chk->IsChecked() != checked) { checked = chk->IsChecked(); wxLogMessage("Row one has been %s by check[0], XRCID = %i", checked ? "enabled" : "disabled", XRCID("check[0]")); wxLogMessage("XRCIDs: first_row[start] = %i, first_row[0] = %i, " "first_row[1] = %i, first_row[2] = %i, " "first_row[end] = %i", XRCID("first_row[start]"), XRCID("first_row[0]"), XRCID("first_row[1]"), XRCID("first_row[2]"), XRCID("first_row[end]")); } } void ObjrefDialog::OnUpdateUISecond(wxUpdateUIEvent& event) { // The checkbox with the XRCID 'check[1]' controls this row of icons wxCheckBox * chk = XRCCTRL(*(nb->GetPage(icons_page)), "check[1]", wxCheckBox); if (chk) event.Enable(chk->IsChecked()); // Let's create a log-window entry static bool checked = true; if (chk->IsChecked() != checked) { checked = chk->IsChecked(); wxLogMessage("Row two has been %s by check[1], XRCID = %i", checked ? "enabled" : "disabled", XRCID("check[1]")); wxLogMessage("XRCIDs: second_row[start] = %i, second_row[0] = %i, " "second_row[1] = %i, second_row[2] = %i, " "second_row[end] = %i", XRCID("second_row[start]"), XRCID("second_row[0]"), XRCID("second_row[1]"), XRCID("second_row[2]"), XRCID("second_row[end]")); } } void ObjrefDialog::OnUpdateUIThird(wxUpdateUIEvent& event) { // The checkbox with the XRCID 'check[2]' controls this row of icons wxCheckBox * chk = XRCCTRL(*(nb->GetPage(icons_page)), "check[2]", wxCheckBox); if (chk) event.Enable(chk->IsChecked()); // Let's create a log-window entry static bool checked = true; if (chk->IsChecked() != checked) { checked = chk->IsChecked(); wxLogMessage("Row three has been %s by check[2], XRCID = %i", checked ? "enabled" : "disabled", XRCID("check[2]")); wxLogMessage("XRCIDs: third_row[start] = %i, third_row[0] = %i, " "third_row[1] = %i, third_row[2] = %i, " "third_row[end] = %i", XRCID("third_row[start]"), XRCID("third_row[0]"), XRCID("third_row[1]"), XRCID("third_row[2]"), XRCID("third_row[end]")); } } void ObjrefDialog::OnNumeralClick(wxCommandEvent& event) { // See how the id range simplifies determining which numeral was clicked int digit = event.GetId() - XRCID("digits[start]"); char c = '0' + digit; if (current==0 && previous==0) { // We're just starting a calculation, so get rid of the placeholder '0' result_txt->Clear(); } else if (operator_expected == true) { // If we've just finished one calculation, and now a digit is entered, // clear ClearCalculator(); result_txt->Clear(); } (*result_txt) << c; current = current*10 + digit; wxLogMessage("You clicked digits[%c], XRCID %i", c, event.GetId()); } void ObjrefDialog::OnOperatorClick(wxCommandEvent& event) { static const char symbols[] = "+-*/="; operator_expected = false; int ID = event.GetId() - XRCID("operators[start]"); // We carefully used "operators[end]" as the name of the Clear button if (event.GetId() == XRCID("operators[end]")) { wxLogMessage("You clicked operators[%i], XRCID %d, 'Clear'", ID, event.GetId()); ClearCalculator(); return; } switch(ID) { case operator_plus: case operator_minus: case operator_multiply: case operator_divide: if (current!=0 || previous!=0) { // We're in the middle of a complex calculation, so do the // first bit Calculate(); } curr_operator = (CalcOperator)ID; break; case operator_equals: Calculate(); wxLogMessage("You clicked operators[%i], XRCID %i, giving a '%c'", ID, event.GetId(), symbols[ID]); curr_operator = operator_equals; // Flag that the next entry should be an operator, not a digit operator_expected = true; return; } (*result_txt) << ' ' << symbols[ID] << ' '; wxLogMessage("You clicked operators[%i], XRCID %i, giving a '%c'", ID, event.GetId(), symbols[ID]); } void ObjrefDialog::Calculate() { switch(curr_operator) { case operator_plus: previous += current; break; case operator_minus: previous -= current; break; case operator_multiply: previous *= current; break; case operator_divide: if (current!=0) previous /= current; break; default: return; } curr_operator = operator_plus; current = 0; result_txt->Clear(); (*result_txt) << previous; } void ObjrefDialog::ClearCalculator() { current = previous = 0; curr_operator = operator_plus; operator_expected = false; result_txt->ChangeValue("0"); }