ITransformProvider.Move(Double, Double) 方法

定义

命名空间:

System.Windows.Automation.Provider

程序集:

UIAutomationProvider.dll

移动此控件。

public:
 void Move(double x, double y);

public void Move (double x, double y);

abstract member Move : double * double -> unit

Public Sub Move (x As Double, y As Double)

参数

x

Double

此控件左侧的绝对屏幕坐标。

y

Double

此控件顶部的绝对屏幕坐标。

例外

InvalidOperationException

如果 CanMove 属性为 false。

示例

以下示例演示了可移动的自定义控件的此方法的一个可能实现。

/// <summary>
/// Moves the provider to the specified position.
/// </summary>
/// <param name="x">The specified X screen coordinate.</param>
/// <param name="y">The specified Y screen coordinate</param>
void ITransformProvider.Move(double x, double y)
{
    int leftInt = (int)x;
    int topInt = (int)y;

    if (!((ITransformProvider)this).CanMove)
        throw new InvalidOperationException(
            "Operation cannot be performed.");

    // Move should never be allowed to place a control outside the 
    // bounds of its container; the control should always be accessible 
    // using the keyboard or mouse.
    // Use the bounds of the parent window to limit the placement 
    // of the custom control.
    int maxLeft = 10;
    int maxTop = 10;
    int maxRight =
        this.customControl.formWidth - this.customControl.Width - 10;
    int maxBottom =
        this.customControl.formHeight - this.customControl.Height - 10;

    if (leftInt < maxLeft)
        leftInt = 0;
    if (topInt < maxTop)
        topInt = 0;
    if (leftInt > maxRight)
        leftInt = maxRight;
    if (topInt > maxBottom)
        topInt = maxBottom;

    // Invoke control method on separate thread to avoid clashing with UI.
    // Use anonymous method for simplicity.
    this.customControl.Invoke(new MethodInvoker(delegate ()
    {
        this.customControl.Left = leftInt;
        this.customControl.Top = topInt;
    }));
}

''' <summary>
''' Moves the provider to the specified position.
''' </summary>
''' <param name="x">The specified X screen coordinate.</param>
''' <param name="y">The specified Y screen coordinate</param>
Private Sub Move(ByVal x As Double, ByVal y As Double) Implements ITransformProvider.Move
    Dim leftInt As Integer = CInt(x)
    Dim topInt As Integer = CInt(y)

    If Not(CType(Me, ITransformProvider)).CanMove Then
        Throw New InvalidOperationException("Operation cannot be performed.")
    End If

    ' Move should never be allowed to place a control outside the 
    ' bounds of its container; the control should always be accessible 
    ' using the keyboard or mouse.
    ' Use the bounds of the parent window to limit the placement 
    ' of the custom control.
    Dim maxLeft As Integer = 10
    Dim maxTop As Integer = 10
    Dim maxRight As Integer = Me.customControl.formWidth - Me.customControl.Width - 10
    Dim maxBottom As Integer = Me.customControl.formHeight - Me.customControl.Height - 10

    If leftInt < maxLeft Then
        leftInt = 0
    End If
    If topInt < maxTop Then
        topInt = 0
    End If
    If leftInt > maxRight Then
        leftInt = maxRight
    End If
    If topInt > maxBottom Then
        topInt = maxBottom
    End If

    ' Invoke control method on separate thread to avoid clashing with UI.
    ' Use anonymous method for simplicity.
    Me.customControl.Invoke(New MethodInvoker(Sub()
        Me.customControl.Left = leftInt
        Me.customControl.Top = topInt
    End Sub))
End Sub

注解

无法移动、调整对象大小或旋转对象，以便其生成的屏幕位置完全超出其容器的坐标，并且无法访问键盘或鼠标。 例如，当顶级窗口完全移出屏幕外或子对象在容器视区边界之外移动时。 在这些情况下，对象尽可能接近所请求的屏幕坐标，并覆盖顶部或左侧坐标，以位于容器边界内。

另请参阅

• 实现 UI 自动化 Transform 控件模式