AuroraMiddleware/wxWidgets
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Avoid blank alpha and graphics screens in the drawing sample.

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It was confusing to not see anything when selecting one of the screens using
wxGraphicsRenderer if a renderer hadn't been selected from the menu before.

Switch to using wxGC automatically now if one of these screens selected and
there was no previously selected renderer.
This commit is contained in:
Vadim Zeitlin 2015-03-06 17:15:21 +01:00
parent 6b8b3ee379
commit 7653edb34d
1 changed files with 14 additions and 1 deletions
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15
samples/drawing/drawing.cpp
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@ -102,6 +102,7 @@ public:
// set or remove the clipping region
void Clip(bool clip) { m_clip = clip; Refresh(); }
#if wxUSE_GRAPHICS_CONTEXT
bool HasRenderer() const { return m_renderer != NULL; }
void UseGraphicRenderer(wxGraphicsRenderer* renderer)
{ m_renderer = renderer; Refresh(); }
#endif
@ -2022,7 +2023,19 @@ void MyFrame::OnSave(wxCommandEvent& WXUNUSED(event))
void MyFrame::OnShow(wxCommandEvent& event)
{
m_canvas->ToShow(event.GetId());
const int show = event.GetId();
#if wxUSE_GRAPHICS_CONTEXT
// Make sure we do use a graphics context when selecting one of the screens
// requiring it.
if ( show == File_ShowAlpha || show == File_ShowGraphics )
{
if ( !m_canvas->HasRenderer() )
m_canvas->UseGraphicRenderer(wxGraphicsRenderer::GetDefaultRenderer());
}
#endif // wxUSE_GRAPHICS_CONTEXT
m_canvas->ToShow(show);
}
void MyFrame::OnOption(wxCommandEvent& event)