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Make wxSashWindow resizing work with wxGTK3 with X11

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Apply similar changes as to wxSplitterWindow to make the existing
wxINVERT-based code work at least in this case, i.e.

1. Don't use wxScreenDC with wxGTK3 (although this is more involved in
   this case, as we can't just use wxClientDC for this window itself).
2. Use white brush so that wxCOMPOSITION_DIFF works as wxINVERT.
This commit is contained in:
Vadim Zeitlin 2022-06-17 01:59:06 +02:00
parent 946baf7884
commit f4cdb30646
1 changed files with 25 additions and 10 deletions
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35
src/generic/sashwin.cpp
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@ -545,7 +545,6 @@ void wxSashWindow::DrawSashTracker(wxSashEdgePosition edge, int x, int y)
int w, h;
GetClientSize(&w, &h);
wxScreenDC screenDC;
int x1, y1;
int x2, y2;
@ -583,18 +582,34 @@ void wxSashWindow::DrawSashTracker(wxSashEdgePosition edge, int x, int y)
ClientToScreen(&x1, &y1);
ClientToScreen(&x2, &y2);
#ifdef __WXGTK3__
// We need to draw over the parent window, not this one, as we want to
// allow the sash go outside of this window.
wxWindow* const parent = wxGetTopLevelParent(this);
if ( !parent )
return;
wxClientDC dc(parent);
parent->ScreenToClient(&x1, &y1);
parent->ScreenToClient(&x2, &y2);
// In the ports with wxGraphicsContext-based wxDC, wxINVERT only works for
// inverting the background when using white foreground (note that this
// code is not going to work anyhow with wxOSX nor with wxGTK when using
// Wayland, as drawing using wxClientDC doesn't work at all there), but
// this at least makes it work with wxGTK with X11.
wxPen sashTrackerPen(*wxWHITE, 2, wxPENSTYLE_SOLID);
#else
wxScreenDC dc;
wxPen sashTrackerPen(*wxBLACK, 2, wxPENSTYLE_SOLID);
#endif
screenDC.SetLogicalFunction(wxINVERT);
screenDC.SetPen(sashTrackerPen);
screenDC.SetBrush(*wxTRANSPARENT_BRUSH);
dc.SetLogicalFunction(wxINVERT);
dc.SetPen(sashTrackerPen);
dc.SetBrush(*wxTRANSPARENT_BRUSH);
screenDC.DrawLine(x1, y1, x2, y2);
screenDC.SetLogicalFunction(wxCOPY);
screenDC.SetPen(wxNullPen);
screenDC.SetBrush(wxNullBrush);
dc.DrawLine(x1, y1, x2, y2);
}
// Position and size subwindows.