From 334c76fd31f98d95dff94f059da90a118c4ea6be Mon Sep 17 00:00:00 2001
From: Eike Ziller <eike.ziller@qt.io>
Date: Fri, 15 Feb 2019 15:30:52 +0100
Subject: Help viewer: Add option for scroll wheel zooming

Fixes: QTCREATORBUG-14154
Change-Id: Ia6c4aedb78954614477f0228ba82c4dc476a2525
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: David Schulz <david.schulz@qt.io>
---
 src/plugins/help/webenginehelpviewer.cpp | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'src/plugins/help/webenginehelpviewer.cpp')

diff --git a/src/plugins/help/webenginehelpviewer.cpp b/src/plugins/help/webenginehelpviewer.cpp
index 60773b91fe..197f356d79 100644
--- a/src/plugins/help/webenginehelpviewer.cpp
+++ b/src/plugins/help/webenginehelpviewer.cpp
@@ -292,6 +292,31 @@ WebView::WebView(WebEngineHelpViewer *viewer)
 {
 }
 
+bool WebView::event(QEvent *ev)
+{
+    // work around QTBUG-43602
+    if (ev->type() == QEvent::ChildAdded) {
+        auto ce = static_cast<QChildEvent *>(ev);
+        ce->child()->installEventFilter(this);
+    } else if (ev->type() == QEvent::ChildRemoved) {
+        auto ce = static_cast<QChildEvent *>(ev);
+        ce->child()->removeEventFilter(this);
+    }
+    return QWebEngineView::event(ev);
+}
+
+bool WebView::eventFilter(QObject *src, QEvent *e)
+{
+    Q_UNUSED(src)
+    // work around QTBUG-43602
+    if (m_viewer->isScrollWheelZoomingEnabled() && e->type() == QEvent::Wheel) {
+        auto we = static_cast<QWheelEvent *>(e);
+        if (we->modifiers() == Qt::ControlModifier)
+            return true;
+    }
+    return false;
+}
+
 void WebView::contextMenuEvent(QContextMenuEvent *event)
 {
     QMenu *menu = page()->createStandardContextMenu();
-- 
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