C# 如何在wpf中设置内部TextBoxView的边距
我有一个例子,我想最小化文本框的水平填充 使用snoop,我发现文本框由多个子控件组成。 其中之一是边距为2,0,2,0的TextBoxView TextBoxView是一个内部wpf组件,没有公共APIC# 如何在wpf中设置内部TextBoxView的边距,c#,wpf,textbox,margin,padding,C#,Wpf,Textbox,Margin,Padding,我有一个例子,我想最小化文本框的水平填充 使用snoop,我发现文本框由多个子控件组成。 其中之一是边距为2,0,2,0的TextBoxView TextBoxView是一个内部wpf组件,没有公共API 如何去除“内部填充”?将外部边距设置为-2,0,-2,0以补偿填充。我创建了一个自定义控件来删除该内部填充 public class MyTextBox : TextBox { public MyTextBox() { Loaded += OnLoaded;
如何去除“内部填充”?将外部边距设置为-2,0,-2,0以补偿填充。我创建了一个自定义控件来删除该内部填充
public class MyTextBox : TextBox
{
public MyTextBox()
{
Loaded += OnLoaded;
}
void OnLoaded(object sender, RoutedEventArgs e)
{
// the internal TextBoxView has a margin of 2,0,2,0 that needs to be removed
var contentHost = Template.FindName("PART_ContentHost", this) as ScrollViewer;
if (contentHost != null && contentHost.Content != null && contentHost.Content is FrameworkElement)
{
var textBoxView = contentHost.Content as FrameworkElement;
textBoxView.Margin = new Thickness(0,0,0,0);
}
}
}
以下是一种肮脏的做法:
public static class TextBoxView
{
public static readonly DependencyProperty MarginProperty = DependencyProperty.RegisterAttached(
"Margin",
typeof(Thickness?),
typeof(TextBoxView),
new PropertyMetadata(null, OnTextBoxViewMarginChanged));
public static void SetMargin(TextBox element, Thickness? value)
{
element.SetValue(MarginProperty, value);
}
[AttachedPropertyBrowsableForChildren(IncludeDescendants = false)]
[AttachedPropertyBrowsableForType(typeof(TextBox))]
public static Thickness? GetMargin(TextBox element)
{
return (Thickness?)element.GetValue(MarginProperty);
}
private static void OnTextBoxViewMarginChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var textBox = (TextBox)d;
OnTextBoxViewMarginChanged(textBox, (Thickness?)e.NewValue);
}
private static void OnTextBoxViewMarginChanged(TextBox textBox, Thickness? margin)
{
if (!textBox.IsLoaded)
{
textBox.Dispatcher.BeginInvoke(
DispatcherPriority.Loaded,
new Action(() => OnTextBoxViewMarginChanged(textBox, margin)));
return;
}
var textBoxView = textBox.NestedChildren()
.SingleOrDefault(x => x.GetType().Name == "TextBoxView");
if (margin == null)
{
textBoxView?.ClearValue(FrameworkElement.MarginProperty);
}
else
{
textBoxView?.SetValue(FrameworkElement.MarginProperty, margin);
}
}
private static IEnumerable<DependencyObject> NestedChildren(this DependencyObject parent)
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
{
var child = VisualTreeHelper.GetChild(parent, i);
yield return child;
if (VisualTreeHelper.GetChildrenCount(child) == 0)
{
continue;
}
foreach (var nestedChild in NestedChildren(child))
{
yield return nestedChild;
}
}
}
}
公共静态类TextBoxView
{
公共静态只读DependencyProperty MarginProperty=DependencyProperty.RegisterAttached(
“保证金”,
类型(厚度?),
类型(TextBoxView),
新的PropertyMetadata(null,OnTextBoxViewMarginChanged));
公共静态空白设置边距(文本框元素,厚度?值)
{
元素设置值(MarginProperty,value);
}
[AttachedPropertyBrowsableForChildren(包括Descendants=false)]
[AttachedPropertyBrowsableForType(typeof(TextBox))]
公共静态厚度?GetMargin(文本框元素)
{
返回(厚度?)元素.GetValue(MarginProperty);
}
私有静态void OnTextBoxViewMarginChanged(DependencyObject d、DependencyPropertyChangedEventArgs e)
{
var textBox=(textBox)d;
OnTextBoxViewMarginChanged(文本框,(厚度?)e.NewValue);
}
私有静态无效OnTextBoxViewMarginChanged(文本框文本框,厚度?边距)
{
如果(!textBox.IsLoaded)
{
textBox.Dispatcher.BeginInvoke(
DispatcherPriority.已加载,
新操作(()=>OnTextBoxViewMarginChanged(文本框,边距));
返回;
}
var textBoxView=textBox.NestedChildren()
.SingleOrDefault(x=>x.GetType().Name==“TextBoxView”);
如果(边距==null)
{
textBoxView?.ClearValue(FrameworkElement.MarginProperty);
}
其他的
{
textBoxView?.SetValue(FrameworkElement.MarginProperty,边距);
}
}
私有静态IEnumerable嵌套子对象(此DependencyObject父对象)
{
for(int i=0;i
它允许设置文本框的边距:
<Style TargetType="{x:Type TextBox}">
<Setter Property="demo:TextBoxView.Margin" Value="1,0" />
</Style>
根本没有针对性能进行优化。TextBoxView在问题中应用了边距(而不是填充)错误的文本,我将更新此内容。将父控件的边距设置为-2似乎没有帮助。好主意。对我来说是可行的,但是我还是禁用了边框,并且还需要将背景设置为
{x:Null}
,这在我的情况下是可以的。