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IsValidDragAction プロパティ

指定したドラッグ操作が有効かどうかを示すブール値を取得または設定します。
シンタックス
'宣言
 
Public Property IsValidDragAction As Boolean
public bool IsValidDragAction {get; set;}
使用例
Imports Infragistics.Windows.DockManager
Imports Infragistics.Windows.DockManager.Dragging
Imports Infragistics.Windows.DockManager.Events

Private Sub XamDockManager_PaneDragOver(ByVal sender As Object, ByVal e As PaneDragOverEventArgs)
    ' note: this event is only fired once for each unique 
    ' pane drag action. 

    ' the drag action provides information about the type 
    ' of action that will occur. the property is of the 
    ' base class - PaneDragAction - so you need to upcast 
    ' to the appropriate type to get additional information 
    ' 
    If TypeOf e.DragAction Is FloatPaneAction Then
        ' here we are preventing a drag operation from 
        ' changing a docked pane into a new floating pane. 
        ' the same effect would have been accomplished if 
        ' the AllowDockingFloating of one or more of the 
        ' panes in the e.Panes had been set to false. 
        e.IsValidDragAction = False
        ' note: by default this event will only fire for 
        ' valid drop locations. if you need to receive this 
        ' event for locations that are not valid (e.g. based 
        ' on properties of the pane(s) being dragged such as 
        ' the AllowDocking(Left|Right|Top|Bottom) properties) 
        ' then you need to set the 
        ' RaisePaneDragOverForInvalidLocations property of the 
        ' event args for the PaneDragStarting to true. 
        ' 
        'e.IsValidDragAction = true; 
    Else
    End If

    Dim sb As New System.Text.StringBuilder()
    sb.Append(e.DragAction.ToString())
    sb.Append(": ")

    ' you can see the panes that are being dragged 
    For Each pane As ContentPane In e.Panes
        sb.Append(pane.Header)
        sb.Append(",")
    Next

    System.Diagnostics.Debug.WriteLine(sb.ToString(), "PaneDragOver")

    ' the cursor property can be used to override the default 
    ' valid/invalid drop cursor that was specified in the 
    ' panedragstarting event. 
    If e.IsValidDragAction = False Then
        e.Cursor = Cursors.No
    End If

    ' mark the event handled so it doesn't keep bubbling 
    ' up the element tree 
    e.Handled = True
End Sub
using Infragistics.Windows.DockManager;
using Infragistics.Windows.DockManager.Dragging;
using Infragistics.Windows.DockManager.Events;

private void XamDockManager_PaneDragOver(object sender, PaneDragOverEventArgs e)
{
	// note: this event is only fired once for each unique 
	// pane drag action.

	// the drag action provides information about the type
	// of action that will occur. the property is of the 
	// base class - PaneDragAction - so you need to upcast
	// to the appropriate type to get additional information
	//
	if (e.DragAction is FloatPaneAction)
	{
		// here we are preventing a drag operation from 
		// changing a docked pane into a new floating pane. 
		// the same effect would have been accomplished if 
		// the AllowDockingFloating of one or more of the 
		// panes in the e.Panes had been set to false.
		e.IsValidDragAction = false;
	}
	else
	{
		// note: by default this event will only fire for
		// valid drop locations. if you need to receive this
		// event for locations that are not valid (e.g. based
		// on properties of the pane(s) being dragged such as
		// the AllowDocking(Left|Right|Top|Bottom) properties)
		// then you need to set the 
		// RaisePaneDragOverForInvalidLocations property of the
		// event args for the PaneDragStarting to true.
		//
		//e.IsValidDragAction = true;
	}

	System.Text.StringBuilder sb = new System.Text.StringBuilder();
	sb.Append(e.DragAction.ToString());
	sb.Append(": ");

	// you can see the panes that are being dragged
	foreach (ContentPane pane in e.Panes)
	{
		sb.Append(pane.Header);
		sb.Append(",");
	}

	System.Diagnostics.Debug.WriteLine(sb.ToString(), "PaneDragOver");

	// the cursor property can be used to override the default
	// valid/invalid drop cursor that was specified in the 
	// panedragstarting event.
	if (e.IsValidDragAction == false)
		e.Cursor = Cursors.No;

	// mark the event handled so it doesn't keep bubbling
	// up the element tree
	e.Handled = true;
}
<igDock:XamDockManager PaneDragOver="XamDockManager_PaneDragOver">
    <igDock:XamDockManager.Panes>
        <igDock:SplitPane>
            <igDock:ContentPane Header="Test Pane" AllowDockingRight="False" />
        </igDock:SplitPane>
        <igDock:SplitPane igDock:XamDockManager.InitialLocation="DockedRight">
            <igDock:ContentPane Header="Don't Allow" AllowFloatingOnly="False" AllowDockingFloating="False"/>
        </igDock:SplitPane>
    </igDock:XamDockManager.Panes>
</igDock:XamDockManager>
参照