wxMac, PaintEvent

[Stefan Csomor]

Hi Nusi

thank's very much for that detailed setup - ready to test for me :-)

stay tuned

Stefan

> -----Original Message-----
> From: Nusret Taşçı [mailto:nusi at sofha.de] 
> Sent: Sonntag, 24. September 2006 19:45
> To: wx-users at lists.wxwidgets.org
> Subject: Re: wxMac, PaintEvent
> 
> > wxPanels are windows, not just drawable areas, so yes, you 
> will have 
> > to connect the events in another way, or call back upon the parent 
> > from the paint events of the chilrdren.
> 
> I'm sorry that I answer so late, but I couldn't continue 
> fixing the remaining problem until today.
> 
> I've tracked down the issue to one specific point, let me 
> give an example so that we both have something to argue about:
> 
> #include "wx/wxprec.h"
> #ifndef WX_PRECOMP
>      #include "wx/wx.h"
> #endif
> // Define a new application type, each program should derive 
> a class from wxApp class MyApp : public wxApp {
> public:
>      virtual bool OnInit();
> };
> 
> // Define a new frame type: this is going to be our main 
> frame class MyFrame : public wxFrame {
> public:
>      MyFrame(const wxString& title);
> private:
>      void ButtonClicked(wxCommandEvent &event);
>      void UpperPaint(wxPaintEvent &event);
>      void LowerPaint(wxPaintEvent &event);
> 
>      bool     m_bDrawUpperRed;
>      wxButton *pButton;
>      wxPanel  *pUpperPanel;
>      wxPanel  *pLowerPanel;
>      DECLARE_EVENT_TABLE()
> };
> 
> BEGIN_EVENT_TABLE(MyFrame, wxFrame)
> END_EVENT_TABLE()
> 
> IMPLEMENT_APP(MyApp)
> 
> bool MyApp::OnInit()
> {
>      if ( !wxApp::OnInit() )
>          return false;
>      MyFrame *frame = new MyFrame(_T("Minimal wxWidgets App"));
>      frame->Show(true);
>      return true;
> }
> 
> MyFrame::MyFrame(const wxString& title)
>         : wxFrame(NULL, wxID_ANY, title) {
>      m_bDrawUpperRed = false;
>      pButton = new wxButton(this, wxID_ANY, wxT("Change Color"));
>      pUpperPanel  = new wxPanel(this, wxID_ANY, wxPoint(100, 
> 0), wxSize(100, 100));
>      pLowerPanel  = new wxPanel(this, wxID_ANY, wxPoint(100, 
> 100), wxSize(100, 100));
>      pButton->Connect(wxEVT_COMMAND_BUTTON_CLICKED,
> wxCommandEventHandler(MyFrame::ButtonClicked), NULL, this);
>      // POI
>      pUpperPanel->Connect(wxEVT_PAINT,
> wxPaintEventHandler(MyFrame::UpperPaint), NULL, this);
>      pLowerPanel->Connect(wxEVT_PAINT,
> wxPaintEventHandler(MyFrame::LowerPaint), NULL, this); }
> 
> void MyFrame::ButtonClicked(wxCommandEvent &) {
>      m_bDrawUpperRed = !m_bDrawUpperRed; #if 1 // POINT OF INTEREST
>      // case 1
>      pUpperPanel->Refresh();
>      pLowerPanel->Refresh();
> #else
>      //case 2
>      Refresh();
> #endif
> }
> 
> void MyFrame::UpperPaint(wxPaintEvent &event) {
>      wxPaintDC dc((wxWindow*)event.GetEventObject());
>      if (m_bDrawUpperRed)
>          dc.SetBackground(*wxRED);
>      else
>          dc.SetBackground(*wxGREEN);
>      dc.Clear();
> }
> 
> void MyFrame::LowerPaint(wxPaintEvent &event) {
>      wxPaintDC dc((wxWindow*)event.GetEventObject());
>      if (m_bDrawUpperRed)
>          dc.SetBackground(*wxGREEN);
>      else
>          dc.SetBackground(*wxRED);
>      dc.Clear();
> }
> 
> This sample works.
> If you change the connects to somethink like following:
>      // POI
>      pUpperPanel->Connect(pUpperPanel->GetId(), wxEVT_PAINT, 
> wxPaintEventHandler(MyFrame::UpperPaint), NULL, this);
>      pLowerPanel->Connect(pLowerPanel->GetId(), wxEVT_PAINT, 
> wxPaintEventHandler(MyFrame::LowerPaint), NULL, this);
> 
> than it will not work anymore. The difference is "->GetId()". 
> When connecting to a painthandler, this seems not to work for 
> wxMac. However, Connecting with GetId() for other handlers 
> seem to work, though I haven't tested all of them of course.
> 
> 
> Nusi
> 
> 
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