Add keyboard events support in ScrollBar

Pressing up/down/left/right keys makes the ScrollBar move

Signed-off-by: Daker Fernandes Pinheiro <dakerfp@gmail.com>

declarativeimports/plasmacomponents/ScrollBar.qml

@@ -48,6 +48,47 @@ Item {
 
     visible: flickableItem && handle.width < contents.width
 
+    Keys.onUpPressed: {
+        if (!_isVertical)
+            return;
+
+        if (_inverted)
+            range.value -= stepSize;
+        else
+            range.value += stepSize;
+    }
+
+    Keys.onDownPressed: {
+        if (!_isVertical)
+            return;
+
+        if (_inverted)
+            range.value += stepSize;
+        else
+            range.value -= stepSize;
+    }
+
+    Keys.onLeftPressed: {
+        if (_isVertical)
+            return;
+
+        if (_inverted)
+            range.value += stepSize;
+        else
+            range.value -= stepSize;
+    }
+
+    Keys.onRightPressed: {
+        if (_isVertical)
+            return;
+
+        if (_inverted)
+            range.value -= stepSize;
+        else
+            range.value += stepSize;
+    }
+
+
     Item {
 
         width: _isVertical ? scrollbar.height : scrollbar.width
@@ -90,6 +131,7 @@ Item {
                     running: parent.pressed
                     repeat: true
                     onTriggered: {
+                        scrollbar.forceActiveFocus();
                         if (_inverted)
                             _value += stepSize;
                         else
@@ -129,6 +171,7 @@ Item {
                     running: parent.pressed;
                     repeat: true
                     onTriggered: {
+                        scrollbar.forceActiveFocus();
                         if (_inverted)
                             _value -= stepSize
                         else

declarativeimports/test/Gallery.qml

@@ -31,6 +31,7 @@ Rectangle {
         anchors.fill: parent
         contentWidth: 2200
         contentHeight: 600
+        contentX: 500
 
         Row {
             x: 30
@@ -168,6 +169,7 @@ Rectangle {
                 PlasmaComponents.BusyIndicator {
                     id: busy
                     running: mouse.pressed
+                    smoothAnimation: true
                     MouseArea {
                         id: mouse
                         anchors.fill: parent
@@ -318,6 +320,8 @@ Rectangle {
     PlasmaComponents.ScrollBar {
         id: verticalScrollBar
 
+	    stepSize: 30
+
         orientation: Qt.Vertical
         flickableItem: page
         animated: true