Support contextmenu events using webpage.sendEvent('contextmenu')

Phantomjs issue
https://github.com/ariya/phantomjs/issues/11429

Fixes #11429 by allowing to send a "contextmenu" event. Intentionally
does not map a "click" event using "right" button into contextmenu event
because this would be inconsistent with how browsers work.

Related issue in Ghostdriver:
https://github.com/detro/ghostdriver/issues/125

src/webpage.cpp

@@ -33,6 +33,7 @@
 #include <math.h>
 
 #include <QApplication>
+#include <QContextMenuEvent>
 #include <QDesktopServices>
 #include <QDateTime>
 #include <QDir>
@@ -1504,6 +1505,29 @@ void WebPage::sendEvent(const QString& type, const QVariant& arg1, const QVarian
         return;
     }
 
+    // context click
+    if (type == "contextmenu") {
+        QContextMenuEvent::Reason reason = QContextMenuEvent::Mouse;
+
+        // Gather coordinates
+        if (arg1.isValid() && arg2.isValid()) {
+            m_mousePos.setX(arg1.toInt());
+            m_mousePos.setY(arg2.toInt());
+        }
+
+        // Prepare the context menu event
+        qDebug() << "Context Menu Event:" << eventType << "(" << reason << "," << m_mousePos << ")";
+        QContextMenuEvent* event = new QContextMenuEvent(reason, m_mousePos, QCursor::pos(), keyboardModifiers);
+
+        // Post and process events
+        // Send the context menu event directly to QWebPage::swallowContextMenuEvent which forwards it to JS
+        // If we fire the event using postEvent to m_customWebPage, it will end up in QWebPagePrivate::contextMenuEvent,
+        // which will not forward it to JS at all
+        m_customWebPage->swallowContextMenuEvent(event);
+        return;
+    }
+
+
     // mouse click events: Qt doesn't provide this as a separate events,
     // so we compose it with a mousedown/mouseup sequence
     // mouse doubleclick events: It is not enough to simply send a

test/module/webpage/contextclick-event.js

@@ -0,0 +1,32 @@
+test(function () {
+    var page = require('webpage').create();
+
+    page.evaluate(function() {
+        window.addEventListener('contextmenu', function(event) {
+            window.loggedEvent = window.loggedEvent || {};
+            window.loggedEvent.contextmenu = event;
+        }, false);
+    });
+    page.sendEvent('contextmenu', 42, 217);
+
+    var event = page.evaluate(function() {
+        return window.loggedEvent;
+    });
+    assert_equals(event.contextmenu.clientX, 42);
+    assert_equals(event.contextmenu.clientY, 217);
+
+    // click with modifier key
+    page.evaluate(function() {
+        window.addEventListener('contextmenu', function(event) {
+            window.loggedEvent = window.loggedEvent || {};
+            window.loggedEvent.contextmenu = event;
+        }, false);
+    });
+    page.sendEvent('contextmenu', 100, 100, 'left', page.event.modifier.shift);
+
+    var event = page.evaluate(function() {
+        return window.loggedEvent.contextmenu;
+    });
+    assert_is_true(event.shiftKey);
+
+}, "context click events");