Backport: Bug [#1548]. Implement calltips on Qt.

Backport of changeset 7237:a82b87a88556 and 7238:ba336ac439f0.

1 files changed, 28 insertions, 1 deletions

diff --git a/qt/ScintillaEditBase/ScintillaQt.cpp b/qt/ScintillaEditBase/ScintillaQt.cpp
index 804cd2dc0..98a8000fa 100644
--- a/qt/ScintillaEditBase/ScintillaQt.cpp
+++ b/qt/ScintillaEditBase/ScintillaQt.cpp
@@ -613,11 +613,38 @@ void ScintillaQt::StartDrag()
 	SetDragPosition(SelectionPosition(Sci::invalidPosition));
 }
 
+class CallTipImpl : public QWidget {
+public:
+	CallTipImpl(CallTip *pct_)
+		: QWidget(nullptr, Qt::ToolTip),
+		  pct(pct_)
+	{
+#if QT_VERSION >= QT_VERSION_CHECK(5, 9, 0)
+		setWindowFlag(Qt::WindowTransparentForInput);
+#endif
+	}
+
+	void paintEvent(QPaintEvent *) override
+	{
+		if (pct->inCallTipMode) {
+			Surface *surfaceWindow = Surface::Allocate(0);
+			surfaceWindow->Init(this);
+			surfaceWindow->SetUnicodeMode(SC_CP_UTF8 == pct->codePage);
+			surfaceWindow->SetDBCSMode(pct->codePage);
+			pct->PaintCT(surfaceWindow);
+			delete surfaceWindow;
+		}
+	}
+
+private:
+	CallTip *pct;
+};
+
 void ScintillaQt::CreateCallTipWindow(PRectangle rc)
 {
 
 	if (!ct.wCallTip.Created()) {
-		QWidget *pCallTip =  new QWidget(0, Qt::ToolTip);
+		QWidget *pCallTip = new CallTipImpl(&ct);
 		ct.wCallTip = pCallTip;
 		pCallTip->move(rc.left, rc.top);
 		pCallTip->resize(rc.Width(), rc.Height());