The following examples show how to perform conditional checking to determine whether an item is dragable.
Example
Description
DragSourceEvent (EventType = DragInit) and DragInitEvent are the events that raised when the drag is about to start, so it is an ideal event to perform condition that determines whether the item is dragable.
Code
Using Event Handler
| XAML |
 Copy Code |
<Grid x:Name="LayoutRoot">
<Intersoft:UXListBox x:Name="UXListBox1" HorizontalAlignment="Center" Height="200" VerticalAlignment="Center" Width="150"
AllowMoveItem="True" AllowReorderItem="True" DragInit="UXListBox1_DragInit">
<Intersoft:UXListBoxItem Content="Freezed"/>
<Intersoft:UXListBoxItem Content="Dragable Item 1"/>
<Intersoft:UXListBoxItem Content="Dragable Item 2"/>
</Intersoft:UXListBox>
</Grid>
|
| C# |
Copy Code |
private void UXListBox1_DragInit(object sender, Intersoft.Client.UI.Controls.Interactivity.DragEventArgs e)
{
UXListBoxItem item = e.GetSourceElement() as UXListBoxItem;
if (item.Content.ToString() == "Freezed")
e.SetCancel(true);
}
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Using DragInitEvent
| XAML |
Copy Code |
<Grid x:Name="LayoutRoot">
<Intersoft:UXListBox x:Name="UXListBox1" HorizontalAlignment="Center" Height="200" VerticalAlignment="Center" Width="150"
AllowMoveItem="True" AllowReorderItem="True">
<Intersoft:UXListBoxItem Content="Freezed"/>
<Intersoft:UXListBoxItem Content="Dragable Item 1"/>
<Intersoft:UXListBoxItem Content="Dragable Item 2"/>
</Intersoft:UXListBox>
</Grid>
|
| C# |
Copy Code |
public MainPage()
{
// Required to initialize variables
InitializeComponent();
ISEventManager.RegisterInstanceHandler(
this.UXListBox1, // any element in the routed path which applicable in your scenario
ISDragDrop.DragInitEvent, // the routed event
new Intersoft.Client.UI.Controls.Interactivity.DragEventHandler(UXListBox1_DragInit), // the event handler
true);
}
private void UXListBox1_DragInit(object sender, Intersoft.Client.UI.Controls.Interactivity.DragEventArgs e)
{
UXListBoxItem item = e.GetSourceElement() as UXListBoxItem;
if (item.Content.ToString() == "Freezed")
e.SetCancel(true);
}
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Using DragSourceEvent (EventType = DragInit)
| XAML |
Copy Code |
<Grid x:Name="LayoutRoot">
<Intersoft:UXListBox x:Name="UXListBox1" HorizontalAlignment="Center" Height="200" VerticalAlignment="Center" Width="150"
AllowMoveItem="True" AllowReorderItem="True">
<Intersoft:UXListBoxItem Content="Freezed"/>
<Intersoft:UXListBoxItem Content="Dragable Item 1"/>
<Intersoft:UXListBoxItem Content="Dragable Item 2"/>
</Intersoft:UXListBox>
</Grid>
|
| C# |
Copy Code |
public MainPage()
{
// Required to initialize variables
InitializeComponent();
ISEventManager.RegisterInstanceHandler(
this.UXListBox1, // any element in the routed path which applicable in your scenario
ISDragDrop.DragSourceEvent, // the routed event
new Intersoft.Client.UI.Controls.Interactivity.DragEventHandler(UXListBox1_DragInit), // the event handler
true);
}
private void UXListBox1_DragInit(object sender, Intersoft.Client.UI.Controls.Interactivity.DragEventArgs e)
{
if (e.GetEventType() == DragEventType.DragInit)
{
UXListBoxItem item = e.GetSourceElement() as UXListBoxItem;
if (item.Content.ToString() == "Freezed")
e.SetCancel(true);
}
}
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See Also
