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Implement wxBG_STYLE_TRANSPARENT support for wxGTK.

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Use composited windows if supported by GTK+ for wxWindows with this background
style.

Also add wxWindow::IsTransparentBackgroundSupported() and show how to use it
in the sample.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70569 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2012-02-11 16:26:52 +00:00
parent c3d3028a44
commit 1442168125
9 changed files with 297 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
samples/erase/erase.cpp
View File

@@ -32,6 +32,7 @@
#include "wx/custombgwin.h"
#include "wx/dcbuffer.h"
#include "wx/artprov.h"
// ----------------------------------------------------------------------------
// resources
@@ -146,13 +147,28 @@ public:
ControlWithTransparency(wxWindow *parent,
const wxPoint& pos,
const wxSize& size)
: wxWindow(parent, wxID_ANY, pos, size, wxBORDER_NONE)
{
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));
}
virtual bool HasTransparentBackground() { return true; }
if ( !reason.empty() )
{
// This can be only done now, after creating the window.
SetToolTip(reason);
}
}
private:
void OnPaint( wxPaintEvent& WXUNUSED(event) )
@@ -165,8 +181,17 @@ private:
dc.SetTextForeground(*wxBLUE);
dc.SetBackgroundMode(wxTRANSPARENT);
dc.DrawText("This is custom control with transparency", 0, 2);
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;
};
// ----------------------------------------------------------------------------
@@ -329,7 +354,7 @@ MyCanvas::MyCanvas(wxFrame *parent)
"right one drawn directly",
wxPoint(150, 20));
new ControlWithTransparency(this, wxPoint(65, 125), wxSize(300, 22));
new ControlWithTransparency(this, wxPoint(65, 125), wxSize(350, 22));
SetFocusIgnoringChildren();
SetBackgroundColour(*wxCYAN);