GetTemplateChild在自定义ContentControl上不起作用
GetTemplateChild在自定义ContentControl上不起作用
提问于 2022-03-03 19:52:23
我有一个定制的ContentControl，如下所示。
Modal.xaml：
<Style TargetType="local:Modal">
<Setter Property="Background" Value="#65000000" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="local:Modal">
<Grid Background="{TemplateBinding Background}"
Padding="{TemplateBinding Padding}"
Visibility="{Binding IsOpen, RelativeSource={RelativeSource Mode=TemplatedParent}, Converter={StaticResource BoolToVisibilityConverter}}">
<Border x:Name="ContentBorder"
Padding="80">
<ContentControl HorizontalContentAlignment="Stretch"
VerticalContentAlignment="Stretch">
<Grid x:Name="ContentGrid"
HorizontalAlignment="Stretch"
VerticalAlignment="Center"
CornerRadius="10">
<ContentPresenter Content="{TemplateBinding Content}"/>
</Grid>
</ContentControl>
</Border>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>如何访问代码后面的ContentBorder或ContentGrid控件。我说的是if (control.GetTemplateChild("ContentBorder") is Border border)，它找不到它。请帮帮忙。
后面的代码如下：
Modal.cs：
public class Modal : ContentControl
{
public Modal()
{
DefaultStyleKey = typeof(Modal);
}
public static readonly DependencyProperty IsOpenProperty =
DependencyProperty.Register(nameof(IsOpen), typeof(bool), typeof(Modal), new PropertyMetadata(false));
public bool IsOpen
{
get => (bool)GetValue(IsOpenProperty);
set => SetValue(IsOpenProperty, value);
}
public static readonly DependencyProperty DialogMaxWidthProperty =
DependencyProperty.Register(nameof(DialogMaxWidth), typeof(double), typeof(Modal), new PropertyMetadata(0, OnMaxWidthSet));
private static void OnMaxWidthSet(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var control = (Modal)d;
//GetTemplateChild is unable to find ContentBorder.
if (control.GetTemplateChild("ContentBorder") is Border border)
{
border.MaxWidth = (double)e.NewValue;
}
}
public double DialogMaxWidth
{
get => (double)GetValue(DialogMaxWidthProperty);
set => SetValue(DialogMaxWidthProperty, value);
}
}我正在使用自定义控件从某些地方外部如下所示。
<controls:Modal x:Name="ContentModal"
Canvas.ZIndex="100"
Grid.Row="0"
Grid.RowSpan="2"
IsOpen="{x:Bind ViewModel.IsModalOpen, Mode=OneWay}"
DialogMaxWidth="450"/>Stack Overflow用户
回答已采纳
发布于 2022-03-03 20:28:29
如果DialogMaxWidth属性在OnApplyTemplate之前更改执行，GetTemplateChild将返回null。因此，您必须添加一个字段并在OnApplyTemplate函数上设置它。然后检查它的属性
private Border brd;
public override void OnApplyTemplate()
{
brd = this.GetTemplateChild("ContentBorder") as Border;
if (brd!=null && DialogMaxWidth!=0)
brd.MaxWidth = DialogMaxWidth;
}
private static void OnMaxWidthSet(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var control = (Modal)d;
//GetTemplateChild is unable to find ContentBorder.
if (control.brd != null && control.brd is Border)
{
control.brd.MaxWidth = (double)e.NewValue;
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/71343016
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