如何在WPF中获取richtextbox最后一个词是否为BringIntoView(显示)? [英] How to get whether richtextbox last word is BringIntoView(shown) or not in WPF?
问题描述
我在 wpf 工作,我有一个包含一些内容的富文本框.如果内容超出富文本框,我想隐藏底部边框.如果富文本框中的内容我想显示底部边框.现在我正在使用下面的代码将超出的内容带到富文本框中查看.
i am working in wpf,i have a richtextbox with some contents.if the contents are exceeded to richtextbox i want to hide bottom border.if the content within the richtextbox i want to show the bottom border.Now i am using the below code to bring the exceeded content to view in richtextbox.
FrameworkContentElement fce = (startPos.Parent as FrameworkContentElement);
if (fce != null)
{
fce.BringIntoView();
}
但我想显示底部边框,一旦显示在富文本框中的最后一个字.如何实现?
But i want to display the bottom border,once the last word shown in that richtextbox.How to achieve this?
注意:我已经知道如何动态显示底部边框.但我想知道最后一个单词是否显示在富文本框中?
Note: I already known how to show bottom border dynamically.but i want to know last word are displayed within the richtextbox or not?
问候阿俊
推荐答案
我可以给你提供一种检查字符左上角是否可见的方法.创建一个类库Tools
,内容如下:
I can provide you with a method to check whether the upper left corner of a character is visible or not.
Create a class library Tools
with the following content:
public class ToolsRtb
{
public static bool PositionVisibleIs(RichTextBox rtb, TextPointer pos)
{
// Rectangle around the character to check
Rect r = pos.GetCharacterRect(LogicalDirection.Forward);
// Upper left corner of the rectangle ...
Point upperLeftCorner = r.Location;
HitTestResult result = VisualTreeHelper.HitTest(rtb, upperLeftCorner);
// ... is visible?
if (result != null)
return true;
else
return false;
}
}
请注意,PositionVisibleIs(...)
是一个静态方法,并非专用于特定对象.在包含您的 RichTextBox
的窗口的代码隐藏文件中,使用如下方法:
Note that PositionVisibleIs(...)
is a static method and not dedicated to a specific object.
In the code behind file of the window which contains your RichTextBox
use the method like this:
// Is the last character of the current document visible?
if (ToolsRtb.PositionVisibleIs(rtb, rtb.Document.ContentEnd) == true)
{
...
}
希望这会有所帮助.
这篇关于如何在WPF中获取richtextbox最后一个词是否为BringIntoView(显示)?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!