QueryContinueDragEventArgs.Action 屬性
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
取得或設定拖放作業的狀態。
public:
property System::Windows::Forms::DragAction Action { System::Windows::Forms::DragAction get(); void set(System::Windows::Forms::DragAction value); };public System.Windows.Forms.DragAction Action { get; set; }member this.Action : System.Windows.Forms.DragAction with get, setPublic Property Action As DragAction屬性值
DragAction 值。
範例
此程式碼摘錄示範搭配 事件使用 QueryContinueDragEventArgs 類別 QueryContinueDrag 。 如需完整的程式碼範例， DoDragDrop 請參閱 方法。
void ListDragSource_QueryContinueDrag( Object^ sender, System::Windows::Forms::QueryContinueDragEventArgs^ e )
{
// Cancel the drag if the mouse moves off the form.
ListBox^ lb = dynamic_cast<ListBox^>(sender);
if ( lb != nullptr )
{
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, 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 Sub ListDragSource_QueryContinueDrag(ByVal sender As Object, ByVal e As QueryContinueDragEventArgs) Handles ListDragSource.QueryContinueDrag
' Cancel the drag if the mouse moves off the form.
Dim lb As ListBox = CType(sender, ListBox)
If (lb IsNot Nothing) Then
Dim f As Form = 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) Or
((Control.MousePosition.X - screenOffset.X) > f.DesktopBounds.Right) Or
((Control.MousePosition.Y - screenOffset.Y) < f.DesktopBounds.Top) Or
((Control.MousePosition.Y - screenOffset.Y) > f.DesktopBounds.Bottom)) Then
e.Action = DragAction.Cancel
End If
End If
End Sub
備註
依預設，QueryContinueDrag 事件會在按下 ESC 鍵時，將 Action 設為 DragAction.Cancel，並在按下滑鼠左、中或右鍵時，將 Action 設為 DragAction.Drop。
