Behavior.OnMouseDoubleClick(Glyph, MouseButtons, Point) 方法

定義

命名空間:

System.Windows.Forms.Design.Behavior

組件:

System.Windows.Forms.Design.dll

來源:

Behavior.cs

在任何按兩下滑鼠 (Double-Click) 訊息進入 BehaviorService 的裝飾項視窗時進行呼叫。

public:
 virtual bool OnMouseDoubleClick(System::Windows::Forms::Design::Behavior::Glyph ^ g, System::Windows::Forms::MouseButtons button, System::Drawing::Point mouseLoc);

public virtual bool OnMouseDoubleClick (System.Windows.Forms.Design.Behavior.Glyph? g, System.Windows.Forms.MouseButtons button, System.Drawing.Point mouseLoc);

abstract member OnMouseDoubleClick : System.Windows.Forms.Design.Behavior.Glyph * System.Windows.Forms.MouseButtons * System.Drawing.Point -> bool
override this.OnMouseDoubleClick : System.Windows.Forms.Design.Behavior.Glyph * System.Windows.Forms.MouseButtons * System.Drawing.Point -> bool

Public Overridable Function OnMouseDoubleClick (g As Glyph, button As MouseButtons, mouseLoc As Point) As Boolean

參數

g

Glyph

Glyph。

button

MouseButtons

MouseButtons 值，表示按下的按鈕。

mouseLoc

Point

發生按一下動作的位置。

傳回

Boolean

如果已處理訊息，則為 true；否則為 false。

範例

下列程式代碼範例示範如何處理按兩下訊息。 如需完整的程式代碼清單，請參閱 如何：擴充設計模式中控件的外觀和行為。

// When you double-click on an AnchorGlyph, the value of 
// the control's Anchor property is toggled.
//
// Note that the value of the Anchor property is not set
// by direct assignment. Instead, the 
// PropertyDescriptor.SetValue method is used. This 
// enables notification of the design environment, so 
// related events can be raised, for example, the
// IComponentChangeService.ComponentChanged event.

public override bool OnMouseDoubleClick(
    Glyph g, 
    MouseButtons button, 
    Point mouseLoc)
{
    base.OnMouseDoubleClick(g, button, mouseLoc);

    if (button == MouseButtons.Left)
    {
        AnchorGlyph ag = g as AnchorGlyph;
        PropertyDescriptor pdAnchor = 
            TypeDescriptor.GetProperties(ag.relatedControl)["Anchor"];

        if (ag.IsEnabled)
        {
            // The glyph is enabled. 
            // Clear the AnchorStyle flag to disable the Glyph.
            pdAnchor.SetValue(
                ag.relatedControl, 
                ag.relatedControl.Anchor ^ ag.anchorStyle );
        }
        else
        {
            // The glyph is disabled. 
            // Set the AnchorStyle flag to enable the Glyph.
            pdAnchor.SetValue(
                ag.relatedControl,
                ag.relatedControl.Anchor | ag.anchorStyle);
        }
    }

    return true;
}

' When you double-click on an AnchorGlyph, the value of 
' the control's Anchor property is toggled.
'
' Note that the value of the Anchor property is not set
' by direct assignment. Instead, the 
' PropertyDescriptor.SetValue method is used. This 
' enables notification of the design environment, so 
' related events can be raised, for example, the
' IComponentChangeService.ComponentChanged event.
Public Overrides Function OnMouseDoubleClick( _
ByVal g As Glyph, _
ByVal button As MouseButtons, _
ByVal mouseLoc As Point) As Boolean

    MyBase.OnMouseDoubleClick(g, button, mouseLoc)

    If button = MouseButtons.Left Then
        Dim ag As AnchorGlyph = g

        Dim pdAnchor As PropertyDescriptor = _
        TypeDescriptor.GetProperties(ag.relatedControl)("Anchor")

        If ag.IsEnabled Then
            ' The glyph is enabled. 
            ' Clear the AnchorStyle flag to disable the Glyph.
            pdAnchor.SetValue(ag.relatedControl, _
            ag.relatedControl.Anchor Xor ag.anchorStyle)
        Else
            ' The glyph is disabled. 
            ' Set the AnchorStyle flag to enable the Glyph.
            pdAnchor.SetValue(ag.relatedControl, _
            ag.relatedControl.Anchor Or ag.anchorStyle)
        End If
    End If

    Return True

End Function

備註

OnMouseDoubleClick當任何按兩下訊息進入 WndProc 的裝飾項視窗BehaviorService時，就會呼叫 方法。 訊息會先在此傳遞至行為堆疊中的最 Behavior 上層。 true從這個方法傳回表示 訊息已由 Behavior 處理，不應繼續處理。 從這裡，訊息會傳送至適當的行為。

另請參閱

• Glyph
• BehaviorService
• MenuCommand
• 如何：在設計模式中擴充控制項的外觀和行為