以下分别记录label、listbox、treeview三个控件的拖动示例:
1.对被拖动控件,实现拖动事件,主要是通过各种鼠标事件,实现DragDrop.DoDragDrop方法。
2.对于需要拖动到的目的控件,需要实现AllowDrop=”True” Drop=”TargetLabel_Drop”
<Window.Resources> <Style TargetType="ListBoxItem"> <EventSetter Event="PreviewMouseMove" Handler="ListBox_PreviewMouseMove"/> </Style> <Style TargetType="TreeViewItem"> <EventSetter Event="PreviewMouseMove" Handler="TreeView_PreviewMouseMove"/> </Style> </Window.Resources> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="7*"/> <ColumnDefinition Width="Auto"/> <ColumnDefinition Width="3*"/> </Grid.ColumnDefinitions> <StackPanel> <Label Name="Label" Margin="5,10" Content="This is Label" MouseDown="Label_MouseDown"/> <ListBox Margin="5,10"> <ListBoxItem>000</ListBoxItem> <ListBoxItem>111</ListBoxItem> <ListBoxItem>222</ListBoxItem> </ListBox> <TreeView Name="treeView" Margin="5,10"> <TreeViewItem Header="aa"> <TreeViewItem Header="00"/> <TreeViewItem Header="11"/> <TreeViewItem Header="22"/> </TreeViewItem> </TreeView> <Button Height="30" Margin="5,10" Name="btn" Content="Rest" Click="btn_Click"/> </StackPanel> <Rectangle Grid.Column="1" Fill="Red" Width="1"/> <Label Name="TargetLabel" Grid.Column="2" Content="Come here" Background="AliceBlue" VerticalContentAlignment="Center" HorizontalContentAlignment="Center" AllowDrop="True" Drop="TargetLabel_Drop"/> </Grid>
private void TargetLabel_Dropobject sender, DragEventArgs e) { var txt = e.Data.GetDataDataFormats.Text); this.TargetLabel.Content = txt; } private void btn_Clickobject sender, RoutedEventArgs e) { this.TargetLabel.Content = "Come here"; } private void Label_MouseDownobject sender, MouseButtonEventArgs e) { DragDrop.DoDragDropLabel, Label.Content, DragDropEffects.Copy); } private void ListBox_PreviewMouseMoveobject sender, MouseEventArgs e) { var item = sender as ListBoxItem; DragDrop.DoDragDropitem, item.Content, DragDropEffects.Copy); } private void TreeView_PreviewMouseMoveobject sender, MouseEventArgs e) { if e.LeftButton==MouseButtonState.Released) { return; } var t = sender as TreeView; var x = this.treeView.SelectedItem; if x==null) { return; } var item = x as TreeViewItem; DragDrop.DoDragDropitem, item.Header, DragDropEffects.Copy); }