From efdd92ff6e64af2b08cf7b5ae57370ebac636d0f Mon Sep 17 00:00:00 2001
From: Yorik van Havre <yorikvanhavre@users.sourceforge.net>
Date: Thu, 19 Jan 2012 22:42:09 -0200
Subject: [PATCH] allowed BrowserView to zoom with Ctrl+Wheel

---
 src/Mod/Web/Gui/BrowserView.cpp | 68 +++++++++++++++++++++++----------
 src/Mod/Web/Gui/BrowserView.h   | 13 ++++++-
 2 files changed, 60 insertions(+), 21 deletions(-)

diff --git a/src/Mod/Web/Gui/BrowserView.cpp b/src/Mod/Web/Gui/BrowserView.cpp
index b9f04ee4e6..7410edc1db 100644
--- a/src/Mod/Web/Gui/BrowserView.cpp
+++ b/src/Mod/Web/Gui/BrowserView.cpp
@@ -35,6 +35,7 @@
 # include <QPrinter>
 # include <QPrintDialog>
 # include <QScrollBar>
+# include <QMouseEvent>
 # if QT_VERSION >= 0x040400
 # include <QWebFrame>
 # include <QWebView>
@@ -62,6 +63,27 @@
 using namespace WebGui;
 using namespace Gui;
 
+/**
+ *  Constructs a WebView widget which can be zoomed with Ctrl+Mousewheel
+ *  
+ */
+
+WebView::WebView(QWidget *parent)
+    : QWebView(parent)
+{
+}
+
+void WebView::wheelEvent(QWheelEvent *event)
+{
+  if (QApplication::keyboardModifiers() & Qt::ControlModifier)
+  {
+      qreal factor = zoomFactor() + (-event->delta() / 800.0);
+      setZoomFactor(factor);
+      event->accept();
+      return;
+  }
+  QWebView::wheelEvent(event);
+}
 
 /* TRANSLATOR Gui::BrowserView */
 
@@ -75,28 +97,34 @@ BrowserView::BrowserView(QWidget* parent)
       isLoading(false),
       textSizeMultiplier(1.0)
 {
-    WebView = new QWebView(this);
-    setCentralWidget(WebView);
+    view = new WebView(this);
+    setCentralWidget(view);
 
-    WebView->page()->setLinkDelegationPolicy(QWebPage::DelegateAllLinks);
-    WebView->page()->setForwardUnsupportedContent(true);
+    view->page()->setLinkDelegationPolicy(QWebPage::DelegateAllLinks);
+    view->page()->setForwardUnsupportedContent(true);
 
-    connect(WebView, SIGNAL(loadStarted()),
+    // setting background to white
+    QPalette palette = view->palette();
+    palette.setBrush(QPalette::Base, Qt::white);
+    view->page()->setPalette(palette);
+    view->setAttribute(Qt::WA_OpaquePaintEvent, true);
+
+    connect(view, SIGNAL(loadStarted()),
             this, SLOT(onLoadStarted()));
-    connect(WebView, SIGNAL(loadProgress(int)),
+    connect(view, SIGNAL(loadProgress(int)),
             this, SLOT(onLoadProgress(int)));
-    connect(WebView, SIGNAL(loadFinished(bool)),
+    connect(view, SIGNAL(loadFinished(bool)),
             this, SLOT(onLoadFinished()));
-    connect(WebView, SIGNAL(linkClicked(const QUrl &)),
+    connect(view, SIGNAL(linkClicked(const QUrl &)),
             this, SLOT(onLinkClicked(const QUrl &)));
-    connect(WebView->page(), SIGNAL(downloadRequested(const QNetworkRequest &)),
+    connect(view->page(), SIGNAL(downloadRequested(const QNetworkRequest &)),
             this, SLOT(onDownloadRequested(const QNetworkRequest &)));
 }
 
 /** Destroys the object and frees any allocated resources */
 BrowserView::~BrowserView()
 {
-    delete WebView;
+    delete view;
 }
 
 void BrowserView::onLinkClicked (const QUrl & url) 
@@ -168,8 +196,8 @@ void BrowserView::load(const QUrl & url)
     if(isLoading)
         stop();
 
-    WebView->load(url);
-    WebView->setUrl(url);
+    view->load(url);
+    view->setUrl(url);
     if (url.scheme().size() < 2) {
         QString path     = url.path();
         QFileInfo fi(path);
@@ -189,14 +217,14 @@ void BrowserView::setHtml(const QString& HtmlCode,const QUrl & BaseUrl,const QSt
     if (isLoading)
         stop();
 
-    WebView->setHtml(HtmlCode,BaseUrl);
+    view->setHtml(HtmlCode,BaseUrl);
     setWindowTitle(TabName);
     setWindowIcon(QWebSettings::iconForUrl(BaseUrl));
 }
 
 void BrowserView::stop(void)
 {
-    WebView->stop();
+    view->stop();
 }
 
 void BrowserView::onLoadStarted()
@@ -204,7 +232,7 @@ void BrowserView::onLoadStarted()
     QProgressBar* bar = Gui::Sequencer::instance()->getProgressBar();
     bar->setRange(0, 100);
     bar->show();
-    Gui::getMainWindow()->statusBar()->showMessage(tr("Loading %1...").arg(WebView->url().toString()));
+    Gui::getMainWindow()->statusBar()->showMessage(tr("Loading %1...").arg(view->url().toString()));
     isLoading = true;
 }
 
@@ -233,24 +261,24 @@ void BrowserView::OnChange(Base::Subject<const char*> &rCaller,const char* rcRea
 bool BrowserView::onMsg(const char* pMsg,const char** ppReturn)
 {
     if (strcmp(pMsg,"Back")==0){
-        WebView->back();
+        view->back();
         return true;
     } else if (strcmp(pMsg,"Next")==0){
-        WebView->forward();
+        view->forward();
         return true;
     } else if (strcmp(pMsg,"Refresh")==0){
-        WebView->reload();
+        view->reload();
         return true;
     } else if (strcmp(pMsg,"Stop")==0){
         stop();
         return true;
     } else if (strcmp(pMsg,"ZoomIn")==0){
         textSizeMultiplier += 0.2f;
-        WebView->setTextSizeMultiplier(textSizeMultiplier);
+        view->setTextSizeMultiplier(textSizeMultiplier);
         return true;
     } else if (strcmp(pMsg,"ZoomOut")==0){
         textSizeMultiplier -= 0.2f;
-        WebView->setTextSizeMultiplier(textSizeMultiplier);
+        view->setTextSizeMultiplier(textSizeMultiplier);
         return true;
     }
 
diff --git a/src/Mod/Web/Gui/BrowserView.h b/src/Mod/Web/Gui/BrowserView.h
index bb2ada13cd..c32dfd6591 100644
--- a/src/Mod/Web/Gui/BrowserView.h
+++ b/src/Mod/Web/Gui/BrowserView.h
@@ -28,13 +28,24 @@
 #include <Gui/MDIView.h>
 #include <Gui/Window.h>
 
+# if QT_VERSION >= 0x040400
+#include <QWebView>
+#endif
+
 class QWebView;
 class QUrl;
 class QNetworkRequest;
 
 namespace WebGui {
 
+class WebGuiExport WebView : public QWebView
+{
+    Q_OBJECT
 
+public:
+    WebView(QWidget *parent = 0);
+    void wheelEvent(QWheelEvent *event);
+};
 
 /**
  * A special view class which sends the messages from the application to
@@ -87,7 +98,7 @@ protected Q_SLOTS:
     void onDownloadRequested(const QNetworkRequest & request);
 
 private:
-    QWebView* WebView;
+    WebView* view;
     bool isLoading;
     float textSizeMultiplier;
 };