IToggleProvider.Toggle 方法

定义

命名空间:

System.Windows.Automation.Provider

程序集:

UIAutomationProvider.dll

循环通过控件的切换状态。

public:
 void Toggle();

public void Toggle ();

abstract member Toggle : unit -> unit

Public Sub Toggle ()

示例

以下示例演示了可切换的自定义控件的此方法的一种可能实现。

/// <summary>
/// Toggles the control.
/// </summary>
/// <remarks>
/// For this custom control the toggle state is reflected by the color 
/// of the control. This is analogous to the CheckBox IsChecked property.
/// Green   - ToggleState.On
/// Red     - ToggleState.Off
/// Yellow  - ToggleState.Indeterminate
/// </remarks>
void IToggleProvider.Toggle()
{
    ToggleState toggleState =
        customControl.toggleStateColor[customControl.controlColor];
    // Invoke control method on separate thread to avoid clashing with UI.
    // Use anonymous method for simplicity.
    this.customControl.Invoke(new MethodInvoker(delegate ()
    {
        if (toggleState == ToggleState.On)
        {
            customControl.controlColor = Color.Red;
        }
        else if (toggleState == ToggleState.Off)
        {
            customControl.controlColor = Color.Yellow;
        }
        else if (toggleState == ToggleState.Indeterminate)
        {
            customControl.controlColor = Color.Green;
        }
        customControl.Refresh();
    }));
}

''' <summary>
''' Toggles the control.
''' </summary>
''' <remarks>
''' For this custom control the toggle state is reflected by the color 
''' of the control. This is analogous to the CheckBox IsChecked property.
''' Green   - ToggleState.On
''' Red     - ToggleState.Off
''' Yellow  - ToggleState.Indeterminate
''' </remarks>
Private Sub Toggle() Implements IToggleProvider.Toggle
    Dim toggleState As ToggleState = customControl.toggleStateColor(customControl.controlColor)
    ' Invoke control method on separate thread to avoid clashing with UI.
    ' Use anonymous method for simplicity.
    Me.customControl.Invoke(New MethodInvoker(Sub()
                                                  If toggleState = Windows.Automation.ToggleState.On Then
                                                      customControl.controlColor = Color.Red
                                                  ElseIf toggleState = Windows.Automation.ToggleState.Off Then
                                                      customControl.controlColor = Color.Yellow
                                                  ElseIf toggleState = Windows.Automation.ToggleState.Indeterminate Then
                                                      customControl.controlColor = Color.Green
                                                  End If
                                                  customControl.Refresh()
                                              End Sub))
End Sub

注解

控件必须按以下顺序循环访问其切换状态： On、 Off和 (（如果支持) Indeterminate。

另请参阅

• 实现 UI 自动化 Toggle 控件模式