[rekonq] autoScrolling in WebView

[Johannes Zellner]

Hi,

attached a version of a autoscrolling in WebView i hacked together at lunch.
Feel free to reuse or extend to fulfill the needs of 
https://bugs.kde.org/show_bug.cgi?id=203338

(use with "shift"+arrowkeys)

Johannes

diff --git a/src/webview.cpp b/src/webview.cpp
index dca8b6f..d71a7cd 100644
--- a/src/webview.cpp
+++ b/src/webview.cpp
@@ -62,9 +62,10 @@
 WebView::WebView(QWidget* parent)
         : QWebView(parent)
         , m_page(new WebPage(this))
+        , m_scrollAnimationTimeLine(0)
 {
     setPage(m_page);
-    
+
     connect(page(), SIGNAL(statusBarMessage(const QString&)), this, SLOT(setStatusBarText(const QString&)));
 }
 
@@ -270,6 +271,20 @@ void WebView::contextMenuEvent(QContextMenuEvent *event)
 
 void WebView::keyPressEvent(QKeyEvent *event)
 {
+    if ((event->modifiers() == Qt::ShiftModifier) && (event->key() == Qt::Key_Down))
+    {
+        startScrollAnimation(QTimeLine::Forward);
+        return;
+    }
+
+    if ((event->modifiers() == Qt::ShiftModifier) && (event->key() == Qt::Key_Up))
+    {
+        startScrollAnimation(QTimeLine::Backward);
+        return;
+    }
+
+    stopScrollAnimation();
+
     if ((event->modifiers() == Qt::ControlModifier) && (event->key() == Qt::Key_Tab))
     {
         emit ctrlTabPressed();
@@ -286,8 +301,54 @@ void WebView::keyPressEvent(QKeyEvent *event)
 }
 
 
+void WebView::stopScrollAnimation()
+{
+    if (m_scrollAnimationTimeLine)
+    {
+        m_scrollAnimationTimeLine->stop();
+        delete m_scrollAnimationTimeLine;
+        m_scrollAnimationTimeLine = 0;
+    }
+}
+
+
+void WebView::startScrollAnimation(QTimeLine::Direction direction)
+{
+    if (m_scrollAnimationTimeLine)
+    {
+        if (m_scrollAnimationTimeLine->direction() == direction)
+            return;
+        else
+            stopScrollAnimation();
+    }
+
+    // the speed factor (here "2") should be configureable
+    m_scrollAnimationTimeLine = new QTimeLine(page()->mainFrame()->scrollBarMaximum(Qt::Vertical) * 2, this);
+
+    if (direction == QTimeLine::Forward)
+        m_scrollAnimationTimeLine->setFrameRange(page()->mainFrame()->scrollBarValue(Qt::Vertical),
+                                                     page()->mainFrame()->scrollBarMaximum(Qt::Vertical));
+    else
+        m_scrollAnimationTimeLine->setFrameRange(0, page()->mainFrame()->scrollBarValue(Qt::Vertical));
+
+    connect(m_scrollAnimationTimeLine, SIGNAL(frameChanged(int)), this, SLOT(slotScrollVertical(int)));
+    m_scrollAnimationTimeLine->setDirection(direction);
+    m_scrollAnimationTimeLine->start();
+
+    return;
+}
+
+
+void WebView::slotScrollVertical(int scroll)
+{
+    page()->mainFrame()->scroll(0, scroll - page()->mainFrame()->scrollBarValue(Qt::Vertical));
+}
+
+
 void WebView::mousePressEvent(QMouseEvent *event)
 {
+    stopScrollAnimation();
+
     m_page->m_pressedButtons = event->buttons();
     m_page->m_keyboardModifiers = event->modifiers();
     
@@ -307,6 +368,8 @@ void WebView::mousePressEvent(QMouseEvent *event)
 
 void WebView::wheelEvent(QWheelEvent *event)
 {
+    stopScrollAnimation();
+
     if (QApplication::keyboardModifiers() & Qt::ControlModifier)
     {
         int numDegrees = event->delta() / 8;
diff --git a/src/webview.h b/src/webview.h
index 5a2638b..1fa700f 100644
--- a/src/webview.h
+++ b/src/webview.h
@@ -33,11 +33,13 @@
 
 // Qt Includes
 #include <QWebView>
+#include <QtCore/QTimeLine>
 
 // Forward Declarations
 class WebPage;
 
 
+
 class WebView : public QWebView
 {
     Q_OBJECT
@@ -67,9 +69,13 @@ protected:
 private slots:
     void setStatusBarText(const QString &string);
     void slotSearch();
+    void slotScrollVertical(int scroll);
+    void stopScrollAnimation();
+    void startScrollAnimation(QTimeLine::Direction direction);
     
 private:
     WebPage *m_page;
+    QTimeLine *m_scrollAnimationTimeLine;
     
     QString m_statusBarText;
 };

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