如果我从GotFocus事件处理程序中调用SelectAll，它对鼠标不起作用——鼠标一释放，选择就消失了。
编辑:人们喜欢唐纳利的回答，我将试着解释为什么我不像公认的答案那样喜欢它。
It is more complex, while the accepted answer does the same thing in a simpler way.
The usability of accepted answer is better. When you click in the middle of the text, text gets unselected when you release the mouse allowing you to start editing instantly, and if you still want to select all, just press the button again and this time it will not unselect on release. Following Donelle's recipe, if I click in the middle of text, I have to click second time to be able to edit. If I click somewhere within the text versus outside of the text, this most probably means I want to start editing instead of overwriting everything.
我知道这是非常古老的，但这是我的解决方案，它是基于表达式/微软交互性和交互名称空间。
首先，我按照此链接中的说明将交互性触发器放入样式中。
然后就归结为这个
<Style x:Key="baseTextBox" TargetType="TextBox">
<Setter Property="gint:InteractivityItems.Template">
<Setter.Value>
<gint:InteractivityTemplate>
<gint:InteractivityItems>
<gint:InteractivityItems.Triggers>
<i:EventTrigger EventName="GotKeyboardFocus">
<ei:CallMethodAction MethodName="SelectAll"/>
</i:EventTrigger>
<i:EventTrigger EventName="PreviewMouseLeftButtonDown">
<ei:CallMethodAction MethodName="TextBox_PreviewMouseLeftButtonDown"
TargetObject="{Binding ElementName=HostElementName}"/>
</i:EventTrigger>
</gint:InteractivityItems.Triggers>
</gint:InteractivityItems>
</gint:InteractivityTemplate>
</Setter.Value>
</Setter>
</Style>
这
public void TextBox_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
TextBox tb = e.Source as TextBox;
if((tb != null) && (tb.IsKeyboardFocusWithin == false))
{
tb.Focus();
e.Handled = true;
}
}
在我的例子中，我有一个用户控件，其中的文本框有一个隐藏代码。隐藏代码具有处理程序函数。我在XAML中为用户控件设置了一个名称，并将该名称用于元素。这对我来说非常有效。简单地应用样式的任何文本框，你想有所有的文本选择时，点击在文本框。
当TextBox上的GotKeyboardFocus事件触发时，第一个CallMethodAction调用文本框的SelectAll方法。
我希望这能有所帮助。
对于那些对Donnelle /Groky的方法感兴趣，但想要点击最后一个字符的右边(但仍然在TextBox内)，以将插入符号放在输入文本的末尾，我想出了这个解决方案:
int GetRoundedCharacterIndexFromPoint(TextBox textBox, Point clickedPoint)
{
int position = textBox.GetCharacterIndexFromPoint(clickedPoint, true);
// Check if the clicked point is actually closer to the next character
// or if it exceeds the righmost character in the textbox
// (in this case return increase the position by 1)
Rect charLeftEdge = textBox.GetRectFromCharacterIndex(position, false);
Rect charRightEdge = textBox.GetRectFromCharacterIndex(position, true);
double charWidth = charRightEdge.X - charLeftEdge.X;
if (clickedPoint.X + charWidth / 2 > charLeftEdge.X + charWidth) position++;
return position;
}
void SelectivelyIgnoreMouseButton(object sender, MouseButtonEventArgs e)
{
// Find the TextBox
DependencyObject parent = e.OriginalSource as UIElement;
while (parent != null && !(parent is TextBox))
parent = VisualTreeHelper.GetParent(parent);
if (parent != null)
{
var textBox = (TextBox)parent;
if (!textBox.IsKeyboardFocusWithin)
{
// If the text box is not yet focused, give it the focus and
// stop further processing of this click event.
textBox.Focus();
e.Handled = true;
}
else
{
int pos = GetRoundedCharacterIndexFromPoint(textBox, e.GetPosition(textBox));
textBox.CaretIndex = pos;
}
}
}
void SelectAllText(object sender, RoutedEventArgs e)
{
var textBox = e.OriginalSource as TextBox;
if (textBox != null)
textBox.SelectAll();
}
GetRoundedCharacterIndexFromPoint方法取自这篇文章。
这个简单的实现非常适合我:
void TextBox_GotFocus(object sender, RoutedEventArgs e)
{
((TextBox) sender).SelectAll();
}
void TextBox_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
var TextBox = (TextBox) sender;
if (!TextBox.IsKeyboardFocusWithin)
{
TextBox.Focus();
e.Handled = true;
}
}
把它应用到所有的文本框，把下面的代码InitializeComponent();
EventManager.RegisterClassHandler(typeof(TextBox), TextBox.GotFocusEvent, new RoutedEventHandler(TextBox_GotFocus));
EventManager.RegisterClassHandler(typeof(TextBox), TextBox.PreviewMouseDownEvent, new MouseButtonEventHandler(TextBox_PreviewMouseDown));
