handle keypresses (but don't steal them)

is the last thing that was missing from kineticscrolling

svn path=/trunk/KDE/kdelibs/; revision=1124609

widgets/scrollwidget.cpp

@@ -26,6 +26,7 @@
 #include <QGraphicsGridLayout>
 #include <QGraphicsScene>
 #include <QApplication>
+#include <QKeyEvent>
 #include <QWidget>
 #include <QTimer>
 #include <QTime>
@@ -579,6 +580,51 @@ public:
             return widget.data()->y();
     }
 
+    void handleKeyPressEvent(QKeyEvent *event)
+    {
+        if (!widget.data())
+            return;
+
+        QPointF start = q->scrollPosition();
+        QPointF end = start;
+
+        qreal step = 100;
+
+        switch (event->key()) {
+        case Qt::Key_Left:
+            if (canXFlick()) {
+                end += QPointF(-step, 0);
+            }
+            break;
+        case Qt::Key_Right:
+            if (canXFlick()) {
+                end += QPointF(step, 0);
+            }
+            break;
+        case Qt::Key_Up:
+            if (canYFlick()) {
+                end += QPointF(0, -step);
+            }
+            break;
+        case Qt::Key_Down:
+            if (canYFlick()) {
+                end += QPointF(0, step);
+            }
+            break;
+        default:
+            break;
+        }
+
+        fixupAnimation.groupX->stop();
+        fixupAnimation.groupY->stop();
+        fixupAnimation.snapX->stop();
+        fixupAnimation.snapY->stop();
+        directMoveAnimation->setStartValue(start);
+        directMoveAnimation->setEndValue(end);
+        directMoveAnimation->setDuration(200);
+        directMoveAnimation->start();
+    }
+
     void handleMousePressEvent(QGraphicsSceneMouseEvent *event)
     {
         lastPos = QPoint();
@@ -1257,6 +1303,11 @@ void ScrollWidget::resizeEvent(QGraphicsSceneResizeEvent *event)
     QGraphicsWidget::resizeEvent(event);
 }
 
+void ScrollWidget::keyPressEvent(QKeyEvent *event)
+{
+    d->handleKeyPressEvent(event);
+}
+
 void ScrollWidget::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
 {
     if (!d->widget) {

widgets/scrollwidget.h

@@ -255,6 +255,7 @@ protected:
     void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
     void mousePressEvent(QGraphicsSceneMouseEvent *event);
     void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
+    void keyPressEvent(QKeyEvent *event);
     void wheelEvent(QGraphicsSceneWheelEvent *event);
     bool eventFilter(QObject *watched, QEvent *event);
     void focusInEvent(QFocusEvent *event);