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introduce wxBG_STYLE_{ERASE,PAINT} and implement their documented semantics in wxGTK

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61084 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2009-06-16 23:04:42 +00:00
parent b85b06e13d
commit 9c61c5b04b
9 changed files with 250 additions and 184 deletions
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194
samples/erase/erase.cpp
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@@ -1,11 +1,11 @@
/////////////////////////////////////////////////////////////////////////////
// Name: erase.cpp
// Name: samples/erase/erase.cpp
// Purpose: Erase wxWidgets sample
// Author: Robert Roebling
// Modified by:
// Author: Robert Roebling, Vadim Zeitlin
// Created: 04/01/98
// RCS-ID: $Id$
// Copyright: (c) Robert Roebling
// Copyright: (c) 1998 Robert Roebling
// (c) 2009 Vadim Zeitlin
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
@@ -30,6 +30,8 @@
#include "wx/wx.h"
#endif
#include "wx/dcbuffer.h"
// ----------------------------------------------------------------------------
// resources
// ----------------------------------------------------------------------------
@@ -52,10 +54,10 @@ public:
class MyCanvas : public wxScrolledWindow
{
public:
MyCanvas( wxFrame *parent );
MyCanvas(wxFrame *parent);
void UseBuffer(bool useBuffer) { m_useBuffer = useBuffer; Refresh(); }
void EraseBg(bool eraseBg) { m_eraseBg = eraseBg; Refresh(); }
bool UsesBuffer() const { return m_useBuffer; }
private:
void OnPaint( wxPaintEvent &event );
@@ -71,9 +73,6 @@ private:
// use wxMemoryDC in OnPaint()?
bool m_useBuffer;
// paint custom background in OnEraseBackground()?
bool m_eraseBg;
DECLARE_EVENT_TABLE()
};
@@ -83,12 +82,23 @@ class MyFrame : public wxFrame
public:
MyFrame();
private:
void OnUseBuffer(wxCommandEvent& event);
void OnEraseBg(wxCommandEvent& event);
void OnChangeBgStyle(wxCommandEvent& event);
void OnQuit(wxCommandEvent& event);
void OnAbout(wxCommandEvent& event);
private:
// we can only use double-buffering with wxBG_STYLE_PAINT
void OnUpdateUIUseBuffer(wxUpdateUIEvent& event)
{
event.Enable( m_canvas->GetBackgroundStyle() == wxBG_STYLE_PAINT );
}
void OnUpdateUIChangeBgStyle(wxUpdateUIEvent& event)
{
event.Enable( !m_canvas->UsesBuffer() );
}
MyCanvas *m_canvas;
DECLARE_EVENT_TABLE()
@@ -103,7 +113,9 @@ enum
{
// menu items
Erase_Menu_UseBuffer = 100,
Erase_Menu_EraseBg,
Erase_Menu_BgStyleErase,
Erase_Menu_BgStyleSystem,
Erase_Menu_BgStylePaint,
Erase_Menu_Exit = wxID_EXIT,
Erase_Menu_About = wxID_ABOUT
};
@@ -133,40 +145,46 @@ bool MyApp::OnInit()
BEGIN_EVENT_TABLE(MyFrame, wxFrame)
EVT_MENU(Erase_Menu_UseBuffer, MyFrame::OnUseBuffer)
EVT_MENU(Erase_Menu_EraseBg, MyFrame::OnEraseBg)
EVT_MENU_RANGE(Erase_Menu_BgStyleErase, Erase_Menu_BgStylePaint,
MyFrame::OnChangeBgStyle)
EVT_MENU(Erase_Menu_Exit, MyFrame::OnQuit)
EVT_MENU(Erase_Menu_About, MyFrame::OnAbout)
EVT_UPDATE_UI(Erase_Menu_UseBuffer, MyFrame::OnUpdateUIUseBuffer)
EVT_UPDATE_UI_RANGE(Erase_Menu_BgStyleErase, Erase_Menu_BgStylePaint,
MyFrame::OnUpdateUIChangeBgStyle)
END_EVENT_TABLE()
// frame constructor
MyFrame::MyFrame()
: wxFrame(NULL, wxID_ANY, _T("Erase sample"),
: wxFrame(NULL, wxID_ANY, "Erase sample",
wxPoint(50, 50), wxSize(450, 340))
{
SetIcon(wxICON(mondrian));
wxMenu *menuFile = new wxMenu(_T(""), wxMENU_TEAROFF);
menuFile->AppendCheckItem(Erase_Menu_UseBuffer, _T("&Use memory DC\tCtrl-M"));
menuFile->AppendCheckItem(Erase_Menu_EraseBg, _T("Custom &background\tCtrl-B"));
wxMenu *menuFile = new wxMenu("", wxMENU_TEAROFF);
menuFile->AppendCheckItem(Erase_Menu_UseBuffer, "&Use memory DC\tCtrl-M");
menuFile->AppendSeparator();
menuFile->Append(Erase_Menu_Exit, _T("E&xit\tAlt-X"), _T("Quit this program"));
menuFile->AppendRadioItem(Erase_Menu_BgStyleErase,
"Use wxBG_STYLE_&ERASE\tCtrl-E");
menuFile->AppendRadioItem(Erase_Menu_BgStyleSystem,
"Use wxBG_STYLE_&SYSTEM\tCtrl-S");
menuFile->AppendRadioItem(Erase_Menu_BgStylePaint,
"Use wxBG_STYLE_&PAINT\tCtrl-P");
menuFile->AppendSeparator();
menuFile->Append(Erase_Menu_Exit, "E&xit\tAlt-X", "Quit this program");
wxMenu *helpMenu = new wxMenu;
helpMenu->Append(Erase_Menu_About, _T("&About...\tCtrl-A"), _T("Show about dialog"));
helpMenu->Append(Erase_Menu_About, "&About...\tCtrl-A", "Show about dialog");
wxMenuBar *menuBar = new wxMenuBar();
menuBar->Append(menuFile, _T("&File"));
menuBar->Append(helpMenu, _T("&Help"));
menuBar->Append(menuFile, "&File");
menuBar->Append(helpMenu, "&Help");
SetMenuBar(menuBar);
#if wxUSE_STATUSBAR
// create a status bar just for fun (by default with 1 pane only)
CreateStatusBar(2);
SetStatusText(_T("Welcome to wxWidgets erase sample!"));
#endif // wxUSE_STATUSBAR
m_canvas = new MyCanvas( this );
}
@@ -176,9 +194,12 @@ void MyFrame::OnUseBuffer(wxCommandEvent& event)
m_canvas->UseBuffer(event.IsChecked());
}
void MyFrame::OnEraseBg(wxCommandEvent& event)
void MyFrame::OnChangeBgStyle(wxCommandEvent& event)
{
m_canvas->EraseBg(event.IsChecked());
int style = wxBG_STYLE_ERASE + event.GetId() - Erase_Menu_BgStyleErase;
m_canvas->SetBackgroundStyle(static_cast<wxBackgroundStyle>(style));
m_canvas->Refresh();
}
void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
@@ -188,22 +209,29 @@ void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
{
wxMessageBox(_T("This sample shows how you can draw custom background."),
_T("About Erase Sample"), wxOK | wxICON_INFORMATION, this);
wxMessageBox
(
"This sample shows differences between different background styles "
"and how you may draw custom background.\n"
"\n"
"(c) 1998 Robert Roebling\n"
"(c) 2009 Vadim Zeitlin\n",
"About Erase Sample",
wxOK | wxICON_INFORMATION,
this
);
}
BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
EVT_PAINT( MyCanvas::OnPaint)
EVT_CHAR( MyCanvas::OnChar)
EVT_ERASE_BACKGROUND( MyCanvas::OnEraseBackground)
EVT_PAINT(MyCanvas::OnPaint)
EVT_CHAR(MyCanvas::OnChar)
EVT_ERASE_BACKGROUND(MyCanvas::OnEraseBackground)
END_EVENT_TABLE()
MyCanvas::MyCanvas( wxFrame *parent )
: wxScrolledWindow( parent, wxID_ANY, wxDefaultPosition, wxDefaultSize,
wxScrolledWindowStyle | wxSUNKEN_BORDER )
MyCanvas::MyCanvas(wxFrame *parent)
: wxScrolledWindow(parent, wxID_ANY)
{
m_eraseBg =
m_useBuffer = false;
SetScrollbars( 10, 10, 40, 100, 0, 0 );
@@ -213,6 +241,7 @@ MyCanvas::MyCanvas( wxFrame *parent )
new wxStaticBitmap( this, wxID_ANY, m_bitmap, wxPoint(80,20) );
SetFocusIgnoringChildren();
SetBackgroundColour(*wxBLUE);
}
void MyCanvas::OnChar( wxKeyEvent &event )
@@ -241,99 +270,47 @@ void MyCanvas::OnChar( wxKeyEvent &event )
void MyCanvas::DoPaint(wxDC& dc)
{
dc.SetBrush( *wxBLACK_BRUSH );
dc.DrawRectangle( 10,10,200,50 );
dc.DrawRectangle( 10,10,60,50 );
dc.DrawBitmap( m_bitmap, 10, 20, true );
dc.DrawBitmap( m_bitmap, 20, 20, true );
dc.SetTextForeground(*wxBLUE);
dc.DrawText(_T("This text is drawn from OnPaint"), 65, 65);
dc.SetTextForeground(*wxWHITE);
dc.DrawText("This text is drawn from OnPaint", 65, 65);
wxString tmp;
tmp.Printf( _T("Hit any key to display more text: %s"), m_text.c_str() );
tmp.Printf("Hit any key to display more text: %s", m_text);
int w,h;
dc.GetTextExtent( tmp, &w, &h );
dc.SetBrush( *wxWHITE_BRUSH );
dc.DrawRectangle( 65, 85, w, h );
dc.DrawText( tmp, 65, 85 );
#if 0
wxRegionIterator upd( GetUpdateRegion() );
while (upd)
{
wxLogDebug( _T("Paint: %d %d %d %d"), upd.GetX(), upd.GetY(), upd.GetWidth(), upd.GetHeight() );
upd ++;
}
#endif
#if 0
wxSize size = GetSize();
wxSize client_size = GetClientSize();
wxLogDebug( _T("size %d %d client_size %d %d"), size.x, size.y, client_size.x, client_size.y );
#endif
#if 0
int i;
dc.SetPen( *wxWHITE_PEN );
for (i = 0; i < 20; i += 2)
dc.DrawLine( i,i, i+100,i );
dc.SetPen( *wxWHITE_PEN );
for (i = 200; i < 220; i += 2)
dc.DrawLine( i-200,i, i-100,i );
wxRegion region( 110, 110, 80, 80 );
wxRegion hole( 130, 130, 40, 1 );
region.Intersect( hole );
dc.SetClippingRegion( region );
dc.SetBrush( *wxRED_BRUSH );
dc.DrawRectangle( 100, 100, 200, 200 );
dc.DestroyClippingRegion();
dc.SetPen( *wxTRANSPARENT_PEN );
wxRegion strip( 110, 200, 30, 1 );
wxRegionIterator it( strip );
while (it)
{
dc.DrawRectangle( it.GetX(), it.GetY(), it.GetWidth(), it.GetHeight() );
it ++;
}
#endif // 0
}
void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
{
wxPaintDC dcWin(this);
PrepareDC( dcWin );
if ( m_useBuffer )
{
const wxSize size = GetClientSize();
wxMemoryDC dc;
wxBitmap bmp(size.x, size.y);
dc.SelectObject(bmp);
dc.Blit(0, 0, size.x, size.y, &dcWin, 0, 0);
dc.DrawText(_T("(copy of background)"), 5, 120 );
wxAutoBufferedPaintDC dc(this);
PrepareDC(dc);
DoPaint(dc);
dcWin.Blit(0, 0, size.x, size.y, &dc, 0, 0);
}
else
{
DoPaint(dcWin);
wxPaintDC dc(this);
PrepareDC(dc);
DoPaint(dc);
}
}
void MyCanvas::OnEraseBackground( wxEraseEvent& event )
{
if ( !m_eraseBg )
{
event.Skip();
return;
}
wxASSERT_MSG
(
GetBackgroundStyle() == wxBG_STYLE_ERASE,
"shouldn't be called unless background style is \"erase\""
);
wxDC& dc = *event.GetDC();
dc.SetPen(*wxGREEN_PEN);
@@ -355,6 +332,7 @@ void MyCanvas::OnEraseBackground( wxEraseEvent& event )
}
dc.SetTextForeground(*wxRED);
dc.DrawText(_T("This text is drawn from OnEraseBackground"), 60, 160);
dc.SetBackgroundMode(wxSOLID);
dc.DrawText("This text is drawn from OnEraseBackground", 60, 160);
}