Intersoft ClientUI Documentation
How-to: Drag an UIElement using API
| Intersoft ClientUI 8 > ClientUI Fundamentals > Drag-drop Framework Overview > Drag-drop Framework How-to Topics > How-to: Drag an UIElement using API |
This example shows how to drag an UIElement using API and store some data in the drag process.
You can use DragDrop.DoDragDrop method or ISDragDrop.DoDragDrop method to manually drag an UIElement. This method requires the UIElement to be dragged, the data its going to be carried (set it to null if there is none), and the drag effects. This example show you how to make an UIElement dragable and how to store the data to be carried.
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<Grid x:Name="LayoutRoot" Background="White"> <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center" MouseLeftButtonDown="StackPanel_MouseLeftButtonDown" MouseLeftButtonUp="StackPanel_MouseLeftButtonUp" MouseMove="StackPanel_MouseMove"> <Image Source="folder.png" Height="64" Width="64"/> <TextBlock Text="My Archive" HorizontalAlignment="Center" VerticalAlignment="Center"/> </StackPanel> </Grid> |
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| C# |
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private Point _startPosition; private bool _isMouseLeftDown; public MainPage() { // Required to initialize variables InitializeComponent(); } private void StackPanel_MouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e) { FrameworkElement element = sender as FrameworkElement; this._startPosition = e.GetPosition(null, true); this._isMouseLeftDown = true; element.CaptureMouse(); } private void StackPanel_MouseLeftButtonUp(object sender, System.Windows.Input.MouseButtonEventArgs e) { FrameworkElement element = sender as FrameworkElement; this._startPosition = new Point(-1, -1); this._isMouseLeftDown = false; element.ReleaseMouseCapture(); } private void StackPanel_MouseMove(object sender, System.Windows.Input.MouseEventArgs e) { FrameworkElement element = sender as FrameworkElement; if (this._isMouseLeftDown) { Point current = e.GetPosition(null, true); if (Math.Abs(current.X - this._startPosition.X) >= 4 || Math.Abs(current.Y - this._startPosition.Y) >= 4) { DragDropEventData dataObject = new DragDropEventData(); string sourceData = "Some string data to store..."; byte[] unicodeText = Encoding.Unicode.GetBytes(sourceData); byte[] utf8Text = Encoding.UTF8.GetBytes(sourceData); string uniCodeFormat = "Unicode"; string utf8DataFormat = "UTF-8"; dataObject.SetData(sourceData); dataObject.SetData(uniCodeFormat, unicodeText); dataObject.SetData(utf8DataFormat, utf8Text); this._isMouseLeftDown = false; DragDrop.DoDragDrop(element, dataObject, DragDropEffects.Move); } } } |
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