Added DapScrollView element.

libdap-qt-ui-qml.qrc

@@ -20,5 +20,7 @@
         <file>Device.qml</file>
         <file>widgets/DapRadioButton.qml</file>
         <file>widgets/DapRadioButtonForm.ui.qml</file>
+        <file>widgets/DapScrollView.qml</file>
+        <file>widgets/DapScrollViewForm.ui.qml</file>
     </qresource>
 </RCC>

widgets/DapScrollView.qml

+import QtQuick 2.4
+
+DapScrollViewForm
+{
+    property var contentPos: 0.0
+    viewData.onContentYChanged:
+    {
+        if (viewData.atYBeginning)
+        {
+            scrollButton.state = "goUp"
+        }
+        else if (viewData.atYEnd)
+        {
+            scrollButton.state = "goDown"
+        }
+        else if (contentPos < viewData.contentItem.y)
+        {
+            scrollButton.state = "goUp"
+        }
+        else
+        {
+            scrollButton.state = "goDown"
+        }
+    }
+
+    onEntered:
+    {
+        scrollButton.visible = true;
+    }
+
+    onExited:
+    {
+        scrollButton.visible = false;
+    }
+
+    scrollButton.onEntered:
+    {
+        if (scrollButton.state === "goUp")
+        {
+            scrollButton.imageSource = "qrc:/res/icons/ic_scroll-down_hover.png"
+        }
+        else if (scrollButton.state === "goDown")
+        {
+            scrollButton.imageSource = "qrc:/res/icons/ic_scroll-up_hover.png"
+        }
+    }
+
+    scrollButton.onExited:
+    {
+        if (scrollButton.state === "goUp")
+        {
+            scrollButton.imageSource = "qrc:/res/icons/ic_scroll-down.png"
+        }
+        else if (scrollButton.state === "goDown")
+        {
+            scrollButton.imageSource = "qrc:/res/icons/ic_scroll-up.png"
+        }
+    }
+
+    scrollButton.onClicked:
+    {
+        if(scrollButton.state === "goUp")
+        {
+            viewData.positionViewAtEnd();
+            scrollButton.state = "goDown";
+        }
+        else if(scrollButton.state === "goDown")
+        {
+            viewData.positionViewAtBeginning();
+            scrollButton.state = "goUp";
+        }
+    }
+
+    scrollButton.states:
+    [
+        State
+        {
+            name: "goDown"
+            PropertyChanges
+            {
+                target: scrollButton
+                onStateChanged:
+                {
+                    scrollButton.anchors.top = undefined
+                    scrollButton.anchors.bottom = parent.bottom
+                    scrollButton.exited()
+                }
+            }
+        },
+
+        State
+        {
+            name: "goUp"
+            PropertyChanges
+            {
+                target: scrollButton
+                onStateChanged:
+                {
+                    scrollButton.anchors.bottom = undefined
+                    scrollButton.anchors.top = parent.top
+                    scrollButton.exited()
+                }
+            }
+        }
+
+    ]
+
+    scrollButton.state: "goUp"
+}

widgets/DapScrollViewForm.ui.qml

+import QtQuick 2.4
+
+MouseArea
+{
+    id: dapScrollMouseArea
+    ////@ ListView to attach the ScrollButton
+    property ListView viewData: ListView {}
+    property alias scrollMouseArea: dapScrollMouseArea
+    property alias scrollButton: dapScrollButton
+
+    anchors.fill: parent
+    hoverEnabled: true
+
+    MouseArea
+    {
+        id: dapScrollButton
+        property string imageSource: "qrc:/res/icons/ic_scroll-down.png"
+        width: 36 * pt
+        height: width
+        anchors.right: parent.right
+        anchors.bottom: parent.bottom
+        anchors.bottomMargin: 10 * pt
+        anchors.topMargin: 10 * pt
+        anchors.rightMargin: 10 * pt
+        hoverEnabled: true
+        visible: false
+
+        Image
+        {
+            anchors.fill: parent
+            fillMode: Image.PreserveAspectFit
+            source: dapScrollButton.imageSource
+            sourceSize.height: parent.height
+            sourceSize.width: parent.width
+        }
+    }
+}