Fix QWebEnginePage visibility state

Calling

  view.show();
  view.load(...);
  view.hide();

results in a WebContents in visible state because the first call to show() is
delayed via a timer and never canceled so it takes effect after the hide().

Also, the page's visibility state is not updated when changing views, so that a
visible QWebEngineView can be set to display a hidden QWebEnginePage.

Fixes: QTBUG-77209
Change-Id: I0243c659f4039a35c36e04ea55c5972666170fd0
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

3 files changed, 40 insertions, 1 deletions

diff --git a/src/webenginewidgets/api/qwebenginepage.cpp b/src/webenginewidgets/api/qwebenginepage.cpp
index f252137ae..8451bab1a 100644
--- a/src/webenginewidgets/api/qwebenginepage.cpp
+++ b/src/webenginewidgets/api/qwebenginepage.cpp
@@ -175,7 +175,6 @@ QWebEnginePagePrivate::QWebEnginePagePrivate(QWebEngineProfile *_profile)
     wasShownTimer.setSingleShot(true);
     QObject::connect(&wasShownTimer, &QTimer::timeout, [this](){
         ensureInitialized();
-        wasShown();
     });
 
     profile->d_ptr->addWebContentsAdapterClient(this);
@@ -215,6 +214,9 @@ void QWebEnginePagePrivate::initializationFinished()
     if (!qFuzzyCompare(adapter->currentZoomFactor(), defaultZoomFactor))
         adapter->setZoomFactor(defaultZoomFactor);
 
+    if (view && view->isVisible())
+        adapter->wasShown();
+
     scriptCollection.d->initializationFinished(adapter);
 
     m_isBeingAdopted = false;
diff --git a/src/webenginewidgets/api/qwebengineview.cpp b/src/webenginewidgets/api/qwebengineview.cpp
index 6c08df343..6e1138522 100644
--- a/src/webenginewidgets/api/qwebengineview.cpp
+++ b/src/webenginewidgets/api/qwebengineview.cpp
@@ -61,6 +61,7 @@ void QWebEngineViewPrivate::pageChanged(QWebEnginePage *oldPage, QWebEnginePage
     Q_Q(QWebEngineView);
 
     if (oldPage) {
+        oldPage->d_ptr->wasHidden();
         oldPage->disconnect(q);
     }
 
@@ -74,6 +75,8 @@ void QWebEngineViewPrivate::pageChanged(QWebEnginePage *oldPage, QWebEnginePage
         QObject::connect(newPage, &QWebEnginePage::loadFinished, q, &QWebEngineView::loadFinished);
         QObject::connect(newPage, &QWebEnginePage::selectionChanged, q, &QWebEngineView::selectionChanged);
         QObject::connect(newPage, &QWebEnginePage::renderProcessTerminated, q, &QWebEngineView::renderProcessTerminated);
+        if (q->isVisible())
+            newPage->d_ptr->wasShown();
     }
 
     auto oldUrl = oldPage ? oldPage->url() : QUrl();
diff --git a/tests/auto/widgets/qwebengineview/tst_qwebengineview.cpp b/tests/auto/widgets/qwebengineview/tst_qwebengineview.cpp
index a7ff05f55..1bb65d7df 100644
--- a/tests/auto/widgets/qwebengineview/tst_qwebengineview.cpp
+++ b/tests/auto/widgets/qwebengineview/tst_qwebengineview.cpp
@@ -192,6 +192,8 @@ private Q_SLOTS:
     void webUIURLs_data();
     void webUIURLs();
     void visibilityState();
+    void visibilityState2();
+    void visibilityState3();
     void jsKeyboardEvent();
     void deletePage();
     void closeOpenerTab();
@@ -3106,6 +3108,38 @@ void tst_QWebEngineView::visibilityState()
     QCOMPARE(evaluateJavaScriptSync(view.page(), "document.visibilityState").toString(), QStringLiteral("visible"));
 }
 
+void tst_QWebEngineView::visibilityState2()
+{
+    QWebEngineView view;
+    QSignalSpy spy(&view, &QWebEngineView::loadFinished);
+    view.show();
+    view.load(QStringLiteral("about:blank"));
+    view.hide();
+    QVERIFY(spy.count() || spy.wait());
+    QVERIFY(spy.takeFirst().takeFirst().toBool());
+    QCOMPARE(evaluateJavaScriptSync(view.page(), "document.visibilityState").toString(), QStringLiteral("hidden"));
+}
+
+void tst_QWebEngineView::visibilityState3()
+{
+    QWebEnginePage page1;
+    QWebEnginePage page2;
+    QSignalSpy spy1(&page1, &QWebEnginePage::loadFinished);
+    QSignalSpy spy2(&page2, &QWebEnginePage::loadFinished);
+    page1.load(QStringLiteral("about:blank"));
+    page2.load(QStringLiteral("about:blank"));
+    QVERIFY(spy1.count() || spy1.wait());
+    QVERIFY(spy2.count() || spy2.wait());
+    QWebEngineView view;
+    view.setPage(&page1);
+    view.show();
+    QCOMPARE(evaluateJavaScriptSync(&page1, "document.visibilityState").toString(), QStringLiteral("visible"));
+    QCOMPARE(evaluateJavaScriptSync(&page2, "document.visibilityState").toString(), QStringLiteral("hidden"));
+    view.setPage(&page2);
+    QCOMPARE(evaluateJavaScriptSync(&page1, "document.visibilityState").toString(), QStringLiteral("hidden"));
+    QCOMPARE(evaluateJavaScriptSync(&page2, "document.visibilityState").toString(), QStringLiteral("visible"));
+}
+
 void tst_QWebEngineView::jsKeyboardEvent()
 {
     QWebEngineView view;