QueryContinueDragEventArgs.Action Property

Gets or sets the status of a drag-and-drop operation.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public DragAction Action { get; set; }
/** @property */
public DragAction get_Action ()

/** @property */
public void set_Action (DragAction value)

public function get Action () : DragAction

public function set Action (value : DragAction)

Not applicable.

Property Value

A DragAction value.

By default, the QueryContinueDrag event sets Action to DragAction.Cancel if the ESC key was pressed and sets Action to DragAction.Drop if the left, middle, or right mouse button is pressed.

This code excerpt demonstrates using the QueryContinueDragEventArgs class with the QueryContinueDrag event. See the DoDragDrop method for the complete code example.

private void ListDragSource_QueryContinueDrag(object sender, System.Windows.Forms.QueryContinueDragEventArgs e) {
    // Cancel the drag if the mouse moves off the form.
    ListBox lb = sender as ListBox;

    if (lb != null) {

        Form f = lb.FindForm();

        // Cancel the drag if the mouse moves off the form. The screenOffset
        // takes into account any desktop bands that may be at the top or left
        // side of the screen.
        if (((Control.MousePosition.X - screenOffset.X) < f.DesktopBounds.Left) ||
            ((Control.MousePosition.X - screenOffset.X) > f.DesktopBounds.Right) ||
            ((Control.MousePosition.Y - screenOffset.Y) < f.DesktopBounds.Top) ||
            ((Control.MousePosition.Y - screenOffset.Y) > f.DesktopBounds.Bottom)) {

            e.Action = DragAction.Cancel;
        }
    }
}

private void listDragSource_QueryContinueDrag(Object sender, 
    System.Windows.Forms.QueryContinueDragEventArgs e)
{
    // Cancel the drag if the mouse moves off the form.
    ListBox lb = (ListBox)sender;

    if (lb != null) {
        Form f = lb.FindForm();
        // Cancel the drag if the mouse moves off the form. The 
        // screenOffset takes into account any desktop bands 
        // that may be at the top or left side of the screen.
        if (Control.get_MousePosition().get_X() - screenOffset.get_X() 
            < f.get_DesktopBounds().get_Left() 
            || Control.get_MousePosition().get_X() 
            - screenOffset.get_X() > f.get_DesktopBounds().get_Right() 
            || Control.get_MousePosition().get_Y() - screenOffset.get_Y() 
            < f.get_DesktopBounds().get_Top() 
            || Control.get_MousePosition().get_Y() - screenOffset.get_Y() 
            > f.get_DesktopBounds().get_Bottom()) {
            e.set_Action(DragAction.Cancel);
        }
    }
} //listDragSource_QueryContinueDrag

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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