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Add wxPanel::SetBackgroundBitmap().

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This method provides a simple way to set a background bitmap without defining
an EVT_ERASE_BACKGROUND handler and, more importantly, one that works
correctly in wxMSW for a window with children as it paints the background of
transparent children too.

Add a test of this method to the erase sample.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67253 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2011-03-20 00:00:49 +00:00
parent cf858bab79
commit cd95f7e65c
19 changed files with 509 additions and 162 deletions
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50
samples/erase/erase.cpp
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@@ -60,6 +60,14 @@ public:
void UseBuffer(bool useBuffer) { m_useBuffer = useBuffer; Refresh(); }
bool UsesBuffer() const { return m_useBuffer; }
void UseBgBitmap(bool useBgBmp)
{
m_useBgBmp = useBgBmp;
SetBackgroundBitmap(m_useBgBmp ? GetBgBitmap() : wxBitmap());
Refresh();
}
void EraseBgInPaint(bool erase) { m_eraseBgInPaint = erase; Refresh(); }
private:
@@ -69,6 +77,24 @@ private:
void DoPaint(wxDC& dc);
// Create an easily recognizable background bitmap.
static wxBitmap GetBgBitmap()
{
static const int BMP_SIZE = 40;
wxBitmap bmp(BMP_SIZE, BMP_SIZE);
wxMemoryDC dc(bmp);
dc.SetBackground(*wxCYAN);
dc.Clear();
dc.SetPen(*wxBLUE_PEN);
dc.DrawLine(0, BMP_SIZE/2, BMP_SIZE/2, 0);
dc.DrawLine(BMP_SIZE/2, 0, BMP_SIZE, BMP_SIZE/2);
dc.DrawLine(BMP_SIZE, BMP_SIZE/2, BMP_SIZE/2, BMP_SIZE);
dc.DrawLine(BMP_SIZE/2, BMP_SIZE, 0, BMP_SIZE/2);
return bmp;
}
wxBitmap m_bitmap;
wxString m_text;
@@ -76,6 +102,9 @@ private:
// use wxMemoryDC in OnPaint()?
bool m_useBuffer;
// use background bitmap?
bool m_useBgBmp;
// erase background in OnPaint()?
bool m_eraseBgInPaint;
@@ -90,6 +119,7 @@ public:
private:
void OnUseBuffer(wxCommandEvent& event);
void OnUseBgBitmap(wxCommandEvent& event);
void OnEraseBgInPaint(wxCommandEvent& event);
void OnChangeBgStyle(wxCommandEvent& event);
void OnQuit(wxCommandEvent& event);
@@ -120,6 +150,7 @@ enum
{
// menu items
Erase_Menu_UseBuffer = 100,
Erase_Menu_UseBgBitmap,
Erase_Menu_EraseBgInPaint,
Erase_Menu_BgStyleErase,
Erase_Menu_BgStyleSystem,
@@ -153,6 +184,7 @@ bool MyApp::OnInit()
BEGIN_EVENT_TABLE(MyFrame, wxFrame)
EVT_MENU(Erase_Menu_UseBuffer, MyFrame::OnUseBuffer)
EVT_MENU(Erase_Menu_UseBgBitmap, MyFrame::OnUseBgBitmap)
EVT_MENU(Erase_Menu_EraseBgInPaint, MyFrame::OnEraseBgInPaint)
EVT_MENU_RANGE(Erase_Menu_BgStyleErase, Erase_Menu_BgStylePaint,
MyFrame::OnChangeBgStyle)
@@ -174,6 +206,8 @@ MyFrame::MyFrame()
wxMenu *menuFile = new wxMenu("", wxMENU_TEAROFF);
menuFile->AppendCheckItem(Erase_Menu_UseBuffer, "&Use memory DC\tCtrl-M");
menuFile->AppendCheckItem(Erase_Menu_UseBgBitmap,
"Use background &bitmap\tCtrl-B");
menuFile->AppendCheckItem(Erase_Menu_EraseBgInPaint,
"&Erase background in EVT_PAINT\tCtrl-R");
menuFile->AppendSeparator();
@@ -205,6 +239,11 @@ void MyFrame::OnUseBuffer(wxCommandEvent& event)
m_canvas->UseBuffer(event.IsChecked());
}
void MyFrame::OnUseBgBitmap(wxCommandEvent& event)
{
m_canvas->UseBgBitmap(event.IsChecked());
}
void MyFrame::OnEraseBgInPaint(wxCommandEvent& event)
{
m_canvas->EraseBgInPaint(event.IsChecked());
@@ -249,6 +288,7 @@ MyCanvas::MyCanvas(wxFrame *parent)
: wxScrolledWindow(parent, wxID_ANY)
{
m_useBuffer = false;
m_useBgBmp = false;
m_eraseBgInPaint = false;
SetScrollbars( 10, 10, 40, 100, 0, 0 );
@@ -310,7 +350,7 @@ void MyCanvas::DoPaint(wxDC& dc)
dc.DrawBitmap( m_bitmap, 20, 20, true );
dc.SetTextForeground(*wxWHITE);
dc.SetTextForeground(*wxRED);
dc.DrawText("This text is drawn from OnPaint", 65, 65);
wxString tmp;
@@ -342,6 +382,14 @@ void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
void MyCanvas::OnEraseBackground( wxEraseEvent& event )
{
// We must not erase the background ourselves if we asked wxPanel to erase
// it using a background bitmap.
if ( m_useBgBmp )
{
event.Skip();
return;
}
wxASSERT_MSG
(
GetBackgroundStyle() == wxBG_STYLE_ERASE,