QueryContinueDragEventArgs Class

Definition

Namespace:

System.Windows.Forms

Assembly:

System.Windows.Forms.dll

Source:

QueryContinueDragEventArgs.cs

Provides data for the QueryContinueDrag event.

C#

public class QueryContinueDragEventArgs : EventArgs

Inheritance

Object

EventArgs

QueryContinueDragEventArgs

Examples

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

C#

private void ListDragSource_QueryContinueDrag(object sender, 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;
        }
    }
}

Remarks

The QueryContinueDrag event occurs during a drag-and-drop operation and allows the drag source to determine whether the drag-and-drop operation should be canceled. A QueryContinueDragEventArgs specifies whether and how the drag-and-drop operation should proceed, whether any modifier keys are pressed, and whether the user has pressed the ESC key.

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.

For information about the event model, see Handling and Raising Events.

Constructors

QueryContinueDragEventArgs(Int32, Boolean, DragAction)

Initializes a new instance of the QueryContinueDragEventArgs class.

Properties

Action	Gets or sets the status of a drag-and-drop operation.
EscapePressed	Gets whether the user pressed the ESC key.
KeyState	Gets the current state of the SHIFT, CTRL, and ALT keys.

Applies to

See also

• DragAction
• DoDragDrop(Object, DragDropEffects)