Stylus.PreviewStylusInRange 附加事件
定义
在触笔进入绘图板范围时发生。Occurs when the stylus comes within range of the tablet.
see AddPreviewStylusInRangeHandler, and RemovePreviewStylusInRangeHandler
see AddPreviewStylusInRangeHandler, and RemovePreviewStylusInRangeHandler
see AddPreviewStylusInRangeHandler, and RemovePreviewStylusInRangeHandler
示例
下面的示例演示如何确定触笔是否反转。The following example demonstrates how to determine whether the stylus is inverted. 此示例假定存在一个名为 TextBox 的 textBox1
,该事件已 PreviewStylusInRange 连接到事件处理程序。This example assumes that there is a TextBox called textBox1
and that the PreviewStylusInRange event is connected to the event handlers.
void textbox1_PreviewStylusInRange(object sender, StylusEventArgs e)
{
if (e.StylusDevice.Inverted)
{
textbox1.AppendText("Pen is inverted\n");
}
else
{
textbox1.AppendText("Pen is not inverted\n");
}
}
Private Sub textbox1_PreviewStylusInRange(ByVal sender As Object, _
ByVal e As StylusEventArgs) Handles textbox1.PreviewStylusInRange
If e.StylusDevice.Inverted Then
textbox1.AppendText("Pen is inverted" & vbLf)
Else
textbox1.AppendText("Pen is not inverted" & vbLf)
End If
End Sub
注解
这是一个附加事件。This is an attached event. WPF 将附加事件作为路由事件实现。WPF implements attached events as routed events. 附加事件本质上是一种 XAML 语言概念,用于引用在不具有自身定义事件的对象上处理的事件。An attached event is, fundamentally, a XAML language concept used to reference events that are handled on objects that do not, themselves, define events. WPF 进一步扩展了附加事件的功能,从而允许它遍历路由。WPF further expands an attached event's capabilities, allowing it to traverse a route. 附加事件在代码中没有直接处理语法;若要在代码中附加路由事件的处理程序,请使用指定的 Add * 处理程序方法。Attached events do not have a direct handling syntax in code; to attach handlers for a routed event in code, use a designated Add*Handler method. 有关详细信息,请参阅 附加事件概述。For details, see Attached Events Overview.
路由事件信息Routed Event Information
标识符字段Identifier field | PreviewStylusInRangeEvent |
路由策略Routing strategy | 隧道Tunneling |
委托Delegate | StylusEventHandler |