Add support for checking if audio is played in a page.

Add support for checking if audio is played in a page, as well
as the ability to (un)mute the audio.

Modify demobrowser example to show (muted) in the tab title, if
the tab is muted, or (audible) if there is audio playing in the tab.
Fix HTML5 audio/video (un)mute to also work.

Change-Id: I7213645e67be2f9da1c5f96cdf6c7eef5341ae4b
Task-number: QTBUG-48788
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@theqtcompany.com>

2 files changed, 64 insertions, 0 deletions

diff --git a/examples/webenginewidgets/demobrowser/tabwidget.cpp b/examples/webenginewidgets/demobrowser/tabwidget.cpp
index 95b79aaac..a7e94ee62 100644
--- a/examples/webenginewidgets/demobrowser/tabwidget.cpp
+++ b/examples/webenginewidgets/demobrowser/tabwidget.cpp
@@ -126,6 +126,15 @@ void TabBar::contextMenuRequested(const QPoint &position)
         action = menu.addAction(tr("Reload Tab"),
                 this, SLOT(reloadTab()), QKeySequence::Refresh);
         action->setData(index);
+
+        // Audio mute / unmute.
+        action = menu.addAction(tr("Mute tab"),
+                this, SLOT(muteTab()));
+        action->setData(index);
+
+        action = menu.addAction(tr("Unmute tab"),
+                this, SLOT(unmuteTab()));
+        action->setData(index);
     } else {
         menu.addSeparator();
     }
@@ -209,6 +218,22 @@ void TabBar::reloadTab()
     }
 }
 
+void TabBar::muteTab()
+{
+    if (QAction *action = qobject_cast<QAction*>(sender())) {
+        int index = action->data().toInt();
+        emit muteTab(index, true);
+    }
+}
+
+void TabBar::unmuteTab()
+{
+    if (QAction *action = qobject_cast<QAction*>(sender())) {
+        int index = action->data().toInt();
+        emit muteTab(index, false);
+    }
+}
+
 TabWidget::TabWidget(QWidget *parent)
     : QTabWidget(parent)
     , m_recentlyClosedTabsAction(0)
@@ -233,6 +258,7 @@ TabWidget::TabWidget(QWidget *parent)
     connect(m_tabBar, SIGNAL(reloadTab(int)), this, SLOT(reloadTab(int)));
     connect(m_tabBar, SIGNAL(reloadAllTabs()), this, SLOT(reloadAllTabs()));
     connect(m_tabBar, SIGNAL(tabMoved(int,int)), this, SLOT(moveTab(int,int)));
+    connect(m_tabBar, SIGNAL(muteTab(int,bool)), this, SLOT(setAudioMutedForTab(int,bool)));
     setTabBar(m_tabBar);
     setDocumentMode(true);
 
@@ -298,6 +324,18 @@ void TabWidget::moveTab(int fromIndex, int toIndex)
     m_lineEdits->insertWidget(toIndex, lineEdit);
 }
 
+void TabWidget::setAudioMutedForTab(int index, bool mute)
+{
+    if (index < 0)
+        index = currentIndex();
+    if (index < 0 || index >= count())
+        return;
+
+    QWidget *widget = this->widget(index);
+    if (WebView *tab = qobject_cast<WebView*>(widget))
+        tab->page()->setAudioMuted(mute);
+}
+
 void TabWidget::addWebAction(QAction *action, QWebEnginePage::WebAction webAction)
 {
     if (!action)
@@ -506,6 +544,10 @@ WebView *TabWidget::newTab(bool makeCurrent)
             this, SLOT(webViewIconChanged()));
     connect(webView, SIGNAL(titleChanged(QString)),
             this, SLOT(webViewTitleChanged(QString)));
+    connect(webView->page(), SIGNAL(audioMutedChanged(bool)),
+            this, SLOT(webPageMutedOrAudibleChanged()));
+    connect(webView->page(), SIGNAL(wasRecentlyAudibleChanged(bool)),
+            this, SLOT(webPageMutedOrAudibleChanged()));
     connect(webView, SIGNAL(urlChanged(QUrl)),
             this, SLOT(webViewUrlChanged(QUrl)));
     connect(webView->page(), SIGNAL(windowCloseRequested()),
@@ -680,6 +722,23 @@ void TabWidget::webViewTitleChanged(const QString &title)
     BrowserApplication::historyManager()->updateHistoryItem(webView->url(), title);
 }
 
+void TabWidget::webPageMutedOrAudibleChanged() {
+    QWebEnginePage* webPage = qobject_cast<QWebEnginePage*>(sender());
+    WebView *webView = qobject_cast<WebView*>(webPage->view());
+
+    int index = webViewIndex(webView);
+    if (-1 != index) {
+        QString title = webView->title();
+
+        bool muted = webPage->isAudioMuted();
+        bool audible = webPage->wasRecentlyAudible();
+        if (muted) title += tr(" (muted)");
+        else if (audible) title += tr(" (audible)");
+
+        setTabText(index, title);
+    }
+}
+
 void TabWidget::webViewUrlChanged(const QUrl &url)
 {
     WebView *webView = qobject_cast<WebView*>(sender());
diff --git a/examples/webenginewidgets/demobrowser/tabwidget.h b/examples/webenginewidgets/demobrowser/tabwidget.h
index b00131130..f4ad9c02d 100644
--- a/examples/webenginewidgets/demobrowser/tabwidget.h
+++ b/examples/webenginewidgets/demobrowser/tabwidget.h
@@ -65,6 +65,7 @@ signals:
     void closeTab(int index);
     void closeOtherTabs(int index);
     void reloadTab(int index);
+    void muteTab(int index, bool mute);
     void reloadAllTabs();
     void tabMoveRequested(int fromIndex, int toIndex);
 
@@ -81,6 +82,8 @@ private slots:
     void closeTab();
     void closeOtherTabs();
     void reloadTab();
+    void muteTab();
+    void unmuteTab();
     void contextMenuRequested(const QPoint &position);
 
 private:
@@ -204,6 +207,7 @@ public slots:
     void reloadAllTabs();
     void nextTab();
     void previousTab();
+    void setAudioMutedForTab(int index, bool mute);
 
 private slots:
     void currentChanged(int index);
@@ -218,6 +222,7 @@ private slots:
     void windowCloseRequested();
     void moveTab(int fromIndex, int toIndex);
     void fullScreenRequested(QWebEngineFullScreenRequest request);
+    void webPageMutedOrAudibleChanged();
 
 private:
     QAction *m_recentlyClosedTabsAction;