Store and restore font size for help viewers. Add font reset shortcut.

Task-number: 253365
Reviewed-by: kh

src/plugins/help/centralwidget.cpp

@@ -131,14 +131,18 @@ CentralWidget::~CentralWidget()
     if (!engine.setupData())
         return;
 
+    QString zoomCount;
     QString currentPages;
     for (int i = 0; i < tabWidget->count(); ++i) {
         HelpViewer *viewer = qobject_cast<HelpViewer*>(tabWidget->widget(i));
-        if (viewer && viewer->source().isValid())
+        if (viewer && viewer->source().isValid()) {
             currentPages += (viewer->source().toString() + QLatin1Char('|'));
+            zoomCount += QString::number(viewer->zoom()) + QLatin1Char('|');
+        }
     }
     engine.setCustomValue(QLatin1String("LastTabPage"), lastTabPage);
     engine.setCustomValue(QLatin1String("LastShownPages"), currentPages);
+    engine.setCustomValue(QLatin1String("LastShownPagesZoom"), zoomCount);
 }
 
 CentralWidget *CentralWidget::instance()
@@ -250,9 +254,21 @@ void CentralWidget::setLastShownPages()
         return;
     }
 
+    value = helpEngine->customValue(QLatin1String("LastShownPagesZoom"),
+        QString()).toString();
+    QVector<QString> zoomVector = value.split(QLatin1Char('|'),
+        QString::SkipEmptyParts).toVector();
+
+    const int zoomCount = zoomVector.count();
+    zoomVector.insert(zoomCount, pageCount - zoomCount, QLatin1String("0"));
+
+    QVector<QString>::const_iterator zIt = zoomVector.constBegin();
     QStringList::const_iterator it = lastShownPageList.constBegin();
-    for (; it != lastShownPageList.constEnd(); ++it)
-        setSourceInNewTab((*it));
+    for (; it != lastShownPageList.constEnd(); ++it, ++zIt)
+        setSourceInNewTab((*it), (*zIt).toInt());
+
+    int tab = helpEngine->customValue(QLatin1String("LastTabPage"), 0).toInt();
+    tabWidget->setCurrentIndex(tab);
 }
 
 bool CentralWidget::hasSelection() const
@@ -404,12 +420,20 @@ void CentralWidget::setGlobalActions(const QList<QAction*> &actions)
     globalActionList = actions;
 }
 
-void CentralWidget::setSourceInNewTab(const QUrl &url)
+void CentralWidget::setSourceInNewTab(const QUrl &url, int zoom)
 {
     HelpViewer* viewer = new HelpViewer(helpEngine, this);
     viewer->installEventFilter(this);
+    viewer->setZoom(zoom);
     viewer->setSource(url);
     viewer->setFocus(Qt::OtherFocusReason);
+    
+#if defined(QT_NO_WEBKIT)
+    QFont font = viewer->font();
+    font.setPointSize(font.pointSize() + int(zoom));
+    viewer->setFont(font);
+#endif
+
     tabWidget->setCurrentIndex(tabWidget->addTab(viewer,
         quoteTabTitle(viewer->documentTitle())));
 

src/plugins/help/centralwidget.h

@@ -90,7 +90,7 @@ public slots:
     void pageSetup();
     void printPreview();
     void setSource(const QUrl &url);
-    void setSourceInNewTab(const QUrl &url);
+    void setSourceInNewTab(const QUrl &url, int zoom = 0);
     HelpViewer *newEmptyTab();
     void home();
     void forward();

src/plugins/help/helpplugin.cpp

@@ -404,6 +404,13 @@ bool HelpPlugin::initialize(const QStringList &arguments, QString *error)
         cmd->setDefaultKeySequence(QKeySequence(tr("Ctrl+-")));
         connect(a, SIGNAL(triggered()), m_centralWidget, SLOT(zoomOut()));
         advancedMenu->addAction(cmd, Core::Constants::G_EDIT_FONT);
+
+        a = new QAction(tr("Reset Font Size"), this);
+        cmd = am->registerAction(a, QLatin1String("Help.ResetFontSize"),
+            modecontext);
+        cmd->setDefaultKeySequence(QKeySequence(tr("Ctrl+0")));
+        connect(a, SIGNAL(triggered()), m_centralWidget, SLOT(resetZoom()));
+        advancedMenu->addAction(cmd, Core::Constants::G_EDIT_FONT);
     }
 
     return true;

src/shared/help/helpviewer.cpp

@@ -277,14 +277,20 @@ void HelpViewer::resetZoom()
     setTextSizeMultiplier(1.0);
 }
 
-void HelpViewer::zoomIn(qreal range)
+void HelpViewer::zoomIn(int range)
 {
-    setTextSizeMultiplier(textSizeMultiplier() + range / 10.0);
+    setTextSizeMultiplier(qMin(2.0, textSizeMultiplier() + range / 10.0));
 }
 
-void HelpViewer::zoomOut(qreal range)
+void HelpViewer::zoomOut(int range)
 {
-    setTextSizeMultiplier(qMax(0.0, textSizeMultiplier() - range / 10.0));
+    setTextSizeMultiplier(qMax(0.5, textSizeMultiplier() - range / 10.0));
+}
+
+int HelpViewer::zoom() const
+{
+    qreal zoom = textSizeMultiplier() * 10.0;
+    return (zoom < 10.0 ? zoom * -1.0 : zoom - 10.0);
 }
 
 void HelpViewer::home()

src/shared/help/helpviewer.h

@@ -76,9 +76,12 @@ public:
     inline bool hasSelection() const
     { return !selectedText().isEmpty(); } // ### this is suboptimal
 
+    void zoomIn(int range = 1);
+    void zoomOut(int range = 1);
+
     void resetZoom();
-    void zoomIn(qreal range = 1);
-    void zoomOut(qreal range = 1);
+    int zoom() const;
+    void setZoom(int zoom) { zoomIn(zoom); }
 
     inline void copy()
     { return triggerPageAction(QWebPage::Copy); }
@@ -124,9 +127,10 @@ public:
     HelpViewer(QHelpEngine *helpEngine, Help::Internal::CentralWidget *parent);
     void setSource(const QUrl &url);
 
-    void resetZoom();
     void zoomIn(int range = 1);
     void zoomOut(int range = 1);
+
+    void resetZoom();
     int zoom() const { return zoomCount; }
     void setZoom(int zoom) { zoomCount = zoom; }