fixes potential crash under gatekeeper

[wxWidgets.git] / samples / erase / erase.cpp

diff --git a/samples/erase/erase.cpp b/samples/erase/erase.cpp
index 554c989f2a9daffadfae0607be6e55e1db5997d3..37fc81bb8870ddcdf4a444b02bde67e89b951343 100644 (file)
--- a/samples/erase/erase.cpp
+++ b/samples/erase/erase.cpp
@@ -30,14 +30,16 @@
     #include "wx/wx.h"
 #endif
 
+#include "wx/custombgwin.h"
 #include "wx/dcbuffer.h"
+#include "wx/artprov.h"
 
 // ----------------------------------------------------------------------------
 // resources
 // ----------------------------------------------------------------------------
 
 // the application icon
-#if !defined(__WXMSW__) && !defined(__WXPM__)
+#ifndef wxHAS_IMAGES_IN_RESOURCES
     #include "../sample.xpm"
 #endif
 
@@ -52,7 +54,7 @@ public:
 };
 
 
-class MyCanvas : public wxScrolledWindow
+class MyCanvas : public wxCustomBackgroundWindow<wxScrolledWindow>
 {
 public:
     MyCanvas(wxFrame *parent);
@@ -139,6 +141,58 @@ private:
     DECLARE_EVENT_TABLE()
 };
 
+class ControlWithTransparency : public wxWindow
+{
+public:
+    ControlWithTransparency(wxWindow *parent,
+                            const wxPoint& pos,
+                            const wxSize& size)
+    {
+        wxString reason;
+        if ( parent->IsTransparentBackgroundSupported(&reason) )
+        {
+            SetBackgroundStyle (wxBG_STYLE_TRANSPARENT);
+            m_message = "This is custom control with transparency";
+        }
+        else
+        {
+            m_message = "Transparency not supported, check tooltip.";
+        }
+
+        Create (parent, wxID_ANY, pos, size, wxBORDER_NONE);
+        Connect(wxEVT_PAINT,
+                wxPaintEventHandler(ControlWithTransparency::OnPaint));
+
+        if ( !reason.empty() )
+        {
+            // This can be only done now, after creating the window.
+            SetToolTip(reason);
+        }
+    }
+
+private:
+    void OnPaint( wxPaintEvent& WXUNUSED(event) )
+    {
+        wxPaintDC dc(this);
+
+        dc.SetPen(*wxRED_PEN);
+        dc.SetBrush(*wxTRANSPARENT_BRUSH);
+        dc.DrawRectangle(GetClientSize());
+
+        dc.SetTextForeground(*wxBLUE);
+        dc.SetBackgroundMode(wxTRANSPARENT);
+        dc.DrawText(m_message, 0, 2);
+
+        // Draw some bitmap/icon to ensure transparent bitmaps are indeed
+        //  transparent on transparent windows
+        wxBitmap bmp(wxArtProvider::GetBitmap(wxART_WARNING, wxART_MENU));
+        wxIcon icon(wxArtProvider::GetIcon(wxART_GOTO_LAST, wxART_MENU));
+        dc.DrawBitmap (bmp, GetSize().x - 1 - bmp.GetWidth(), 2);
+        dc.DrawIcon(icon, GetSize().x - 1 - bmp.GetWidth()-icon.GetWidth(), 2);
+    }
+
+    wxString m_message;
+};
 
 // ----------------------------------------------------------------------------
 // constants
@@ -220,7 +274,7 @@ MyFrame::MyFrame()
 
 
     wxMenu *helpMenu = new wxMenu;
-    helpMenu->Append(Erase_Menu_About, "&About...\tCtrl-A", "Show about dialog");
+    helpMenu->Append(Erase_Menu_About, "&About\tCtrl-A", "Show about dialog");
 
     wxMenuBar *menuBar = new wxMenuBar();
     menuBar->Append(menuFile, "&File");
@@ -282,8 +336,9 @@ BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
 END_EVENT_TABLE()
 
 MyCanvas::MyCanvas(wxFrame *parent)
-        : wxScrolledWindow(parent, wxID_ANY)
 {
+    Create(parent, wxID_ANY);
+
     m_useBuffer = false;
     m_useBgBmp = false;
     m_eraseBgInPaint = false;
@@ -299,16 +354,24 @@ MyCanvas::MyCanvas(wxFrame *parent)
                      "right one drawn directly",
                      wxPoint(150, 20));
 
+    new ControlWithTransparency(this, wxPoint(65, 125), wxSize(350, 22));
+
     SetFocusIgnoringChildren();
     SetBackgroundColour(*wxCYAN);
 }
 
 void MyCanvas::DoPaint(wxDC& dc)
 {
+    PrepareDC(dc);
+
     if ( m_eraseBgInPaint )
     {
         dc.SetBackground(*wxLIGHT_GREY);
-        dc.Clear();
+
+        // Erase the entire virtual area, not just the client area.
+        dc.SetPen(*wxTRANSPARENT_PEN);
+        dc.SetBrush(GetBackgroundColour());
+        dc.DrawRectangle(GetVirtualSize());
 
         dc.DrawText("Background erased in OnPaint", 65, 110);
     }
@@ -330,15 +393,11 @@ void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
     if ( m_useBuffer )
     {
         wxAutoBufferedPaintDC dc(this);
-        PrepareDC(dc);
-
         DoPaint(dc);
     }
     else
     {
         wxPaintDC dc(this);
-        PrepareDC(dc);
-
         DoPaint(dc);
     }
 }
@@ -362,12 +421,12 @@ void MyCanvas::OnEraseBackground( wxEraseEvent& event )
     wxDC& dc = *event.GetDC();
     dc.SetPen(*wxGREEN_PEN);
 
-    PrepareDC( dc );
-
     // clear any junk currently displayed
     dc.Clear();
 
-    const wxSize size = GetClientSize();
+    PrepareDC( dc );
+
+    const wxSize size = GetVirtualSize();
     for ( int x = 0; x < size.x; x += 15 )
     {
         dc.DrawLine(x, 0, x, size.y);