TextPattern.MarginTopAttribute 字段

定义

标识文本范围的 MarginTop (PageSettings) 特性。Identifies the MarginTop (PageSettings) attribute of a text range.

public: static initonly System::Windows::Automation::AutomationTextAttribute ^ MarginTopAttribute;
public static readonly System.Windows.Automation.AutomationTextAttribute MarginTopAttribute;
 staticval mutable MarginTopAttribute : System.Windows.Automation.AutomationTextAttribute
Public Shared ReadOnly MarginTopAttribute As AutomationTextAttribute 

字段值

示例

下面的示例演示如何获取 Microsoft Notepad 中文本范围的属性值。The following example shows how to obtain an attribute value for a range of text in Microsoft Notepad.

备注

仅出于举例目的,Microsoft Notepad 用作文本提供程序。Microsoft Notepad is used as the text provider for example purposes only. 不保证 Microsoft 记事本支持所请求的属性值。Microsoft Notepad is not guaranteed to support the attribute value being requested.

private void GetMarginTopAttribute()
{
    // Start application.
    Process p = Process.Start("Notepad.exe", "text.txt");

    // target --> The root AutomationElement.
    AutomationElement target = AutomationElement.FromHandle(p.MainWindowHandle);

    // Specify the control type we're looking for, in this case 'Document'
    PropertyCondition cond = new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Document);

    AutomationElement textProvider = target.FindFirst(TreeScope.Descendants, cond);

    TextPattern textpatternPattern = textProvider.GetCurrentPattern(TextPattern.Pattern) as TextPattern;

    if (textpatternPattern == null)
    {
        Console.WriteLine("Root element does not contain a descendant that supports TextPattern.");
        return;
    }

    Object oAttribute = textpatternPattern.DocumentRange.GetAttributeValue(TextPattern.MarginTopAttribute);
    if (oAttribute == TextPattern.MixedAttributeValue)
    {
        Console.WriteLine("Mixed top margins.");
    }
    else
    {
        Console.WriteLine(oAttribute.ToString());
    }
}
Private Sub GetMarginTopAttribute()
    ' Start application.
    Dim p As Process = Process.Start("Notepad.exe", "text.txt")

    ' target --> The root AutomationElement.
    Dim target As AutomationElement = AutomationElement.FromHandle(p.MainWindowHandle)

    ' Specify the control type we're looking for, in this case 'Document'
    Dim cond As PropertyCondition = New PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Document)

    Dim textProvider As AutomationElement = target.FindFirst(TreeScope.Descendants, cond)

    Dim textpatternPattern As TextPattern = CType(textProvider.GetCurrentPattern(TextPattern.Pattern), TextPattern)

    If (textpatternPattern Is Nothing) Then
        Console.WriteLine("Root element does not contain a descendant that supports TextPattern.")
        Return
    End If

    Dim oAttribute As Object = textpatternPattern.DocumentRange.GetAttributeValue(TextPattern.MarginTopAttribute)
    If (oAttribute = TextPattern.MixedAttributeValue) Then
        Console.WriteLine("Mixed top margins.")
    Else
        Console.WriteLine(oAttribute.ToString())
    End If
End Sub

注解

此属性表示应用于与调用文本范围关联的页的上边距。This attribute represents the top margin applied to the page(s) associated with the calling text range.

此标识符由 UI 自动化客户端应用程序使用。This identifier is used by UI Automation client applications. UI 自动化提供程序应在 TextPatternIdentifiers中使用等效字段。UI Automation providers should use the equivalent field in TextPatternIdentifiers.

UI 自动化客户端通过调用 GetAttributeValue获取属性的值。UI Automation clients get the value of the attribute by calling GetAttributeValue.

此属性的值的类型为 DoubleValues for this attribute are of type Double. 默认值为 zeroThe default value is zero.

适用于

另请参阅