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windows: enable drop for embedded windows 

when embedding a QWindow into a native win32 window hierarchy, dragndrop
is not working, as RegisterDragDrop is not called.
the parent HWND is wrapped via QWindow::fromWinId(), which is topLevel, but
a Qt::ForeignWindow. it's children are not topLevel.

we therefore add a conditon to call RegisterDragDrop on non-topLevel windows
whose parent is a Qt::ForeignWindow

Change-Id: Id2bfa1130857c21566feae9cb10b62b648d86a72
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
bb10
Tim Blechmann 2015-12-04 08:46:03 +01:00
parent c04e7dead8
commit 98f326e9b8
1 changed files with 11 additions and 1 deletions
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12
src/plugins/platforms/windows/qwindowswindow.cpp
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@ -1033,7 +1033,17 @@ void QWindowsWindow::destroyWindow()
void QWindowsWindow::updateDropSite(bool topLevel)
{
bool enabled = false;
if (topLevel) {
bool parentIsEmbedded = false;
if (!topLevel) {
// if the parent window is a foreign window wrapped via QWindow::fromWinId, we need to enable the drop site
// on the first child window
const QWindow *parent = window()->parent();
if (parent && (parent->type() == Qt::ForeignWindow))
parentIsEmbedded = true;
}
if (topLevel || parentIsEmbedded) {
switch (window()->type()) {
case Qt::Window:
case Qt::Dialog: