Add ToolTip support for Qt WebEngine (QML)

[ChangeLog][QtWebEngineQML][QQuickWebEngineView] ToolTip
(HTML global title attribute) are now handled.

Task-numner: QTBUG-54108
Change-Id: I78cc3c1e934a822d6399ebd35c8c7895fbdf5749
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

1 files changed, 64 insertions, 0 deletions

diff --git a/src/webengine/ui_delegates_manager.cpp b/src/webengine/ui_delegates_manager.cpp
index 6ff12b53f..769a30016 100644
--- a/src/webengine/ui_delegates_manager.cpp
+++ b/src/webengine/ui_delegates_manager.cpp
@@ -50,6 +50,10 @@
 #include <QQmlContext>
 #include <QQmlEngine>
 #include <QQmlProperty>
+#include <QCursor>
+#include <QList>
+#include <QScreen>
+#include <QGuiApplication>
 
 // Uncomment for QML debugging
 //#define UI_DELEGATES_DEBUG
@@ -93,6 +97,31 @@ static QString getUIDelegatesImportDir(QQmlEngine *engine) {
     return importDir;
 }
 
+static QPoint calculateToolTipPosition(QPoint &position, QSize &toolTip) {
+    QRect screen;
+    QList<QScreen *> screens = QGuiApplication::screens();
+    Q_FOREACH (const QScreen *src, screens)
+        if (src->availableGeometry().contains(position))
+            screen = src->availableGeometry();
+
+    position += QPoint(2, 16);
+
+    if (position.x() + toolTip.width() > screen.x() + screen.width())
+        position.rx() -= 4 + toolTip.width();
+    if (position.y() + toolTip.height() > screen.y() + screen.height())
+        position.ry() -= 24 + toolTip.height();
+    if (position.y() < screen.y())
+        position.setY(screen.y());
+    if (position.x() + toolTip.width() > screen.x() + screen.width())
+        position.setX(screen.x() + screen.width() - toolTip.width());
+    if (position.x() < screen.x())
+        position.setX(screen.x());
+    if (position.y() + toolTip.height() > screen.y() + screen.height())
+        position.setY(screen.y() + screen.height() - toolTip.height());
+
+    return position;
+}
+
 const char *defaultPropertyName(QObject *obj)
 {
     const QMetaObject *metaObject = obj->metaObject();
@@ -116,6 +145,7 @@ MenuItemHandler::MenuItemHandler(QObject *parent)
 UIDelegatesManager::UIDelegatesManager(QQuickWebEngineView *view)
     : m_view(view)
     , m_messageBubbleItem(0)
+    , m_toolTip(nullptr)
     FOR_EACH_COMPONENT_TYPE(COMPONENT_MEMBER_INIT, NO_SEPARATOR)
 {
 }
@@ -493,4 +523,38 @@ void UIDelegatesManager::moveMessageBubble(const QRect &anchor)
     QQmlProperty(m_messageBubbleItem.data(), QStringLiteral("y")).write(anchor.y() + anchor.size().height());
 }
 
+void UIDelegatesManager::showToolTip(const QString &text)
+{
+    if (!ensureComponentLoaded(ToolTip))
+        return;
+
+    if (text.isEmpty()) {
+        m_toolTip.reset();
+        return;
+    }
+
+    if (!m_toolTip.isNull())
+        return;
+
+    QQmlContext *context = qmlContext(m_view);
+    m_toolTip.reset(toolTipComponent->beginCreate(context));
+    if (QQuickItem *item = qobject_cast<QQuickItem *>(m_toolTip.data()))
+        item->setParentItem(m_view);
+    m_toolTip->setParent(m_view);
+    toolTipComponent->completeCreate();
+
+    QQmlProperty(m_toolTip.data(), QStringLiteral("text")).write(text);
+
+    int height = QQmlProperty(m_toolTip.data(), QStringLiteral("height")).read().toInt();
+    int width = QQmlProperty(m_toolTip.data(), QStringLiteral("width")).read().toInt();
+    QSize toolTipSize(width, height);
+    QPoint position = m_view->cursor().pos();
+    position = m_view->mapFromGlobal(calculateToolTipPosition(position, toolTipSize)).toPoint();
+
+    QQmlProperty(m_toolTip.data(), QStringLiteral("x")).write(position.x());
+    QQmlProperty(m_toolTip.data(), QStringLiteral("y")).write(position.y());
+
+    QMetaObject::invokeMethod(m_toolTip.data(), "open");
+}
+
 } // namespace QtWebEngineCore