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make it possible to create wxWindowDC for a hidden window

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41131 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Václav Slavík
2006-09-10 15:51:03 +00:00
parent 9c72cf7619
commit 2582bcdc9d
3 changed files with 42 additions and 19 deletions
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28
src/dfb/dcclient.cpp
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@@ -50,28 +50,24 @@ void wxWindowDC::InitForWin(wxWindow *win, const wxRect *rect)
{
wxCHECK_RET( win, _T("invalid window") );
// FIXME: this should be made to work: we need to detect that the window
// is not visible and in that case, a) ignore any drawing actions
// and b) provide dummy surface that can still be used to get
// information (e.g. text extents):
for ( wxWindow *w = win; w; w = w->GetParent() )
{
// painting on hidden TLW when non-TLW windows are shown is OK,
// DirectFB manages that:
if ( w->IsTopLevel() )
break;
wxASSERT_MSG( w->IsShown(),
_T("painting on hidden window not implemented yet") );
}
// check if the rectangle covers full window and so is not needed:
if ( rect && *rect == wxRect(win->GetSize()) )
rect = NULL;
// obtain the surface used for painting:
wxIDirectFBSurfacePtr surface;
if ( !rect )
if ( !win->IsVisible() )
{
// we're painting on invisible window: the changes won't have any
// effect, as the window will be repainted anyhow when it is shown, but
// we still need a valid DC so that e.g. text extents can be measured,
// so let's create a dummy surface that has the same format as the real
// one would have and let the code paint on it:
wxSize size(rect ? rect->GetSize() : win->GetSize());
surface = wxDfbCreateCompatibleSurface(win->GetDfbSurface(), size);
}
else if ( !rect )
{
wxCHECK_RET( win->GetSize().x > 0 && win->GetSize().y > 0,
_T("window has invalid size") );