Help: Add context menu to litehtml backend

Change-Id: I051984e360b41d17d32cff80fd1d4017fc81dae6
Reviewed-by: hjk <hjk@qt.io>

src/plugins/help/litehtmlhelpviewer.cpp

@@ -25,6 +25,7 @@
 
 #include "litehtmlhelpviewer.h"
 
+#include "helpconstants.h"
 #include "localhelpmanager.h"
 
 #include <utils/algorithm.h>
@@ -71,6 +72,10 @@ LiteHtmlHelpViewer::LiteHtmlHelpViewer(QWidget *parent)
 {
     m_viewer->setResourceHandler([](const QUrl &url) { return getData(url); });
     connect(m_viewer, &QLiteHtmlWidget::linkClicked, this, &LiteHtmlHelpViewer::setSource);
+    connect(m_viewer,
+            &QLiteHtmlWidget::contextMenuRequested,
+            this,
+            &LiteHtmlHelpViewer::showContextMenu);
     auto layout = new QVBoxLayout;
     setLayout(layout);
     layout->setContentsMargins(0, 0, 0, 0);
@@ -270,46 +275,40 @@ void LiteHtmlHelpViewer::setSourceInternal(const QUrl &url, Utils::optional<int>
     emit titleChanged();
 }
 
+void LiteHtmlHelpViewer::showContextMenu(const QPoint &pos, const QUrl &url)
+{
+    QMenu menu(nullptr);
+
+    QAction *copyAnchorAction = nullptr;
+    if (!url.isEmpty() && url.isValid()) {
+        if (isActionVisible(HelpViewer::Action::NewPage)) {
+            QAction *action = menu.addAction(
+                QCoreApplication::translate("HelpViewer", Constants::TR_OPEN_LINK_AS_NEW_PAGE));
+            connect(action, &QAction::triggered, this, [this, url]() {
+                emit newPageRequested(url);
+            });
+        }
+        if (isActionVisible(HelpViewer::Action::ExternalWindow)) {
+            QAction *action = menu.addAction(
+                QCoreApplication::translate("HelpViewer", Constants::TR_OPEN_LINK_IN_WINDOW));
+            connect(action, &QAction::triggered, this, [this, url]() {
+                emit externalPageRequested(url);
+            });
+        }
+        copyAnchorAction = menu.addAction(tr("Copy Link"));
+    } else if (!m_viewer->selectedText().isEmpty()) {
+        connect(menu.addAction(tr("Copy")), &QAction::triggered, this, &HelpViewer::copy);
+    }
+
+    if (copyAnchorAction == menu.exec(m_viewer->mapToGlobal(pos)))
+        QGuiApplication::clipboard()->setText(url.toString());
+}
+
 LiteHtmlHelpViewer::HistoryItem LiteHtmlHelpViewer::currentHistoryItem() const
 {
     return {m_viewer->url(), m_viewer->title(), m_viewer->verticalScrollBar()->value()};
 }
 
-// -- private
-//void TextBrowserHelpWidget::contextMenuEvent(QContextMenuEvent *event)
-//{
-//    QMenu menu("", nullptr);
-
-//    QAction *copyAnchorAction = nullptr;
-//    const QUrl link(linkAt(event->pos()));
-//    if (!link.isEmpty() && link.isValid()) {
-//        QAction *action = menu.addAction(tr("Open Link"));
-//        connect(action, &QAction::triggered, this, [this, link]() {
-//            setSource(link);
-//        });
-//        if (m_parent->isActionVisible(HelpViewer::Action::NewPage)) {
-//            action = menu.addAction(QCoreApplication::translate("HelpViewer", Constants::TR_OPEN_LINK_AS_NEW_PAGE));
-//            connect(action, &QAction::triggered, this, [this, link]() {
-//                emit m_parent->newPageRequested(link);
-//            });
-//        }
-//        if (m_parent->isActionVisible(HelpViewer::Action::ExternalWindow)) {
-//            action = menu.addAction(QCoreApplication::translate("HelpViewer", Constants::TR_OPEN_LINK_IN_WINDOW));
-//            connect(action, &QAction::triggered, this, [this, link]() {
-//                emit m_parent->externalPageRequested(link);
-//            });
-//        }
-//        copyAnchorAction = menu.addAction(tr("Copy Link"));
-//    } else if (!textCursor().selectedText().isEmpty()) {
-//        connect(menu.addAction(tr("Copy")), &QAction::triggered, this, &QTextEdit::copy);
-//    } else {
-//        connect(menu.addAction(tr("Reload")), &QAction::triggered, this, &QTextBrowser::reload);
-//    }
-
-//    if (copyAnchorAction == menu.exec(event->globalPos()))
-//        QApplication::clipboard()->setText(link.toString());
-//}
-
 //bool TextBrowserHelpWidget::eventFilter(QObject *obj, QEvent *event)
 //{
 //    if (obj == this) {

src/plugins/help/litehtmlhelpviewer.h

@@ -81,6 +81,7 @@ private:
     void goForward(int count);
     void goBackward(int count);
     void setSourceInternal(const QUrl &url, Utils::optional<int> vscroll = Utils::nullopt);
+    void showContextMenu(const QPoint &pos, const QUrl &url);
 
     struct HistoryItem
     {

src/plugins/help/qlitehtml/container_qpainter.cpp

@@ -1007,6 +1007,20 @@ QVector<QRect> DocumentContainer::leaveEvent()
     return {};
 }
 
+QUrl DocumentContainer::linkAt(const QPoint &documentPos, const QPoint &viewportPos)
+{
+    if (!m_document)
+        return {};
+    const litehtml::element::ptr element = m_document->root()->get_element_by_point(documentPos.x(),
+                                                                                    documentPos.y(),
+                                                                                    viewportPos.x(),
+                                                                                    viewportPos.y());
+    const char *href = element->get_attr("href");
+    if (href)
+        return resolveUrl(QString::fromUtf8(href), m_baseUrl);
+    return {};
+}
+
 QString DocumentContainer::caption() const
 {
     return m_caption;

src/plugins/help/qlitehtml/container_qpainter.h

@@ -138,6 +138,8 @@ public:
                                          Qt::MouseButton button);
     QVector<QRect> leaveEvent();
 
+    QUrl linkAt(const QPoint &documentPos, const QPoint &viewportPos);
+
     QString caption() const;
     QString selectedText() const;
 

src/plugins/help/qlitehtml/qlitehtmlwidget.cpp

@@ -541,6 +541,14 @@ void QLiteHtmlWidget::leaveEvent(QEvent *event)
         viewport()->update(r.translated(-scrollPosition()));
 }
 
+void QLiteHtmlWidget::contextMenuEvent(QContextMenuEvent *event)
+{
+    QPoint viewportPos;
+    QPoint pos;
+    htmlPos(event->pos(), &viewportPos, &pos);
+    emit contextMenuRequested(event->pos(), d->documentContainer.linkAt(pos, viewportPos));
+}
+
 void QLiteHtmlWidget::render()
 {
     if (!d->documentContainer.document())

src/plugins/help/qlitehtml/qlitehtmlwidget.h

@@ -55,6 +55,7 @@ public:
 
 signals:
     void linkClicked(const QUrl &url);
+    void contextMenuRequested(const QPoint &pos, const QUrl &url);
 
 protected:
     void paintEvent(QPaintEvent *event) override;
@@ -64,6 +65,7 @@ protected:
     void mouseReleaseEvent(QMouseEvent *event) override;
     void mouseDoubleClickEvent(QMouseEvent *event) override;
     void leaveEvent(QEvent *event) override;
+    void contextMenuEvent(QContextMenuEvent *event) override;
 
 private:
     void render();