Don't call wxTextMeasure::BeginMeasuring() when using non-native wxDC.

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

diff --git a/samples/erase/erase.cpp b/samples/erase/erase.cpp
index d35028c06f5e2138ce1b69b50c683bc9c997e743..eb54c2ede3e43c215d7df50bbf84e7e132dbdb23 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);
@@ -72,7 +74,6 @@ public:
 
 private:
     void OnPaint( wxPaintEvent &event );
-    void OnChar( wxKeyEvent &event );
     void OnEraseBackground( wxEraseEvent &event );
 
     void DoPaint(wxDC& dc);
@@ -97,7 +98,6 @@ private:
     }
 
     wxBitmap    m_bitmap;
-    wxString    m_text;
 
     // use wxMemoryDC in OnPaint()?
     bool m_useBuffer;
@@ -141,6 +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
@@ -222,7 +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");
@@ -280,13 +332,13 @@ void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 
 BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
     EVT_PAINT(MyCanvas::OnPaint)
-    EVT_CHAR(MyCanvas::OnChar)
     EVT_ERASE_BACKGROUND(MyCanvas::OnEraseBackground)
 END_EVENT_TABLE()
 
 MyCanvas::MyCanvas(wxFrame *parent)
-        : wxScrolledWindow(parent, wxID_ANY)
 {
+    Create(parent, wxID_ANY);
+
     m_useBuffer = false;
     m_useBgBmp = false;
     m_eraseBgInPaint = false;
@@ -302,33 +354,12 @@ 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::OnChar( wxKeyEvent &event )
-{
-#if wxUSE_UNICODE
-    if (event.m_uniChar)
-    {
-        m_text += event.m_uniChar;
-        Refresh();
-        return;
-    }
-#endif
-
-    // some test cases
-    switch (event.m_keyCode)
-    {
-        case WXK_UP: m_text += wxT( "<UP>" ); break;
-        case WXK_LEFT: m_text += wxT( "<LEFT>" ); break;
-        case WXK_RIGHT: m_text += wxT( "<RIGHT>" ); break;
-        case WXK_DOWN: m_text += wxT( "<DOWN>" ); break;
-        case WXK_RETURN: m_text += wxT( "<ENTER>" ); break;
-        default: m_text += (wxChar)event.m_keyCode; break;
-    }
-}
-
 void MyCanvas::DoPaint(wxDC& dc)
 {
     if ( m_eraseBgInPaint )
@@ -345,21 +376,10 @@ void MyCanvas::DoPaint(wxDC& dc)
                     "display corruption", 65, 110);
     }
 
-    dc.SetBrush( *wxBLACK_BRUSH );
-    dc.DrawRectangle( 10,10,60,50 );
-
     dc.DrawBitmap( m_bitmap, 20, 20, true );
 
     dc.SetTextForeground(*wxRED);
     dc.DrawText("This text is drawn from OnPaint", 65, 65);
-
-    wxString tmp;
-    tmp.Printf("Hit any key to display more text: %s", m_text);
-
-    int w,h;
-    dc.GetTextExtent( tmp, &w, &h );
-    dc.DrawRectangle( 65, 85, w, h );
-    dc.DrawText( tmp, 65, 85 );
 }
 
 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )