[英]Binding with a Custom Control and DataTemplate
我知道这个问题已经被一遍又一遍地问过,并且我已经对我的代码进行了很多建议的更改,但是直到现在似乎没有任何效果。 基本上,我想扩展某些具有某些属性的控件。 最简单的示例是带有新属性IsInEditMode的TextBox 。
public class EditableTextBox : TextBox
{
public static readonly DependencyProperty IsInEditModeProperty =
DependencyProperty.Register("IsInEditMode", typeof(bool), typeof(EditableTextBox),
new FrameworkPropertyMetadata(true, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, (o, e) => ((EditableTextBox)o).IsInEditModeChanged(e)));
private void IsInEditModeChanged(DependencyPropertyChangedEventArgs e)
{
IsInEditMode = (bool)e.NewValue;
}
[Bindable(true)]
public bool IsInEditMode
{
get { return (bool)GetValue(IsInEditModeProperty); }
set { SetValue(IsInEditModeProperty, value); }
}
}
对应的DataTemplate
<Style TargetType="controls:EditableTextBox" BasedOn="{StaticResource {x:Type TextBox}}">
<Setter Property="Background" Value="{x:Null}"/>
<Setter Property="BorderBrush" Value="{StaticResource LuculusDarkGrayBrush}"/>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="Foreground" Value="{StaticResource LuculusBlueBrush}"/>
<Setter Property="FontWeight" Value="Normal"/>
<Setter Property="FocusVisualStyle" Value="{x:Null}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="controls:EditableTextBox">
<TextBox x:Name="edTextBox" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" FontWeight="{TemplateBinding FontWeight}"
Background="{TemplateBinding Background}" SnapsToDevicePixels="True" Foreground="{TemplateBinding Foreground}" Text="{TemplateBinding Text}"/>
<ControlTemplate.Triggers>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsInEditMode" Value="False"/>
</MultiTrigger.Conditions>
<Setter Property="BorderThickness" Value="0" TargetName="edTextBox" />
<Setter Property="Cursor" Value="Arrow" TargetName="edTextBox"/>
<Setter Property="IsReadOnly" Value="True" TargetName="edTextBox"/>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsInEditMode" Value="True"/>
<Condition Property="IsKeyboardFocusWithin" Value="True"/>
</MultiTrigger.Conditions>
<Setter Property="FontWeight" Value="Bold" TargetName="edTextBox"/>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsInEditMode" Value="True"/>
</MultiTrigger.Conditions>
<Setter Property="IsReadOnly" Value="False" TargetName="edTextBox"/>
</MultiTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
控件绑定到这样的viewmodel属性
<controls:EditableTextBox IsInEditMode="{Binding IsInEditMode}"/>
绑定无效。 如果我直接输入布尔值,则行为是预期的。
提前致谢
乔恩
您无需使用IsInEditModeChanged,只需删除此部分。 另外,删除BindableAttribute。
不要忘记为您的模型实现INotifyPropertyChanged。 我测试了这个套件,它工作正常。 控制:
public static readonly DependencyProperty IsInEditModeProperty =
DependencyProperty.Register("IsInEditMode", typeof(bool), typeof(EditableTextBox),
new FrameworkPropertyMetadata(true, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));
public bool IsInEditMode
{
get { return (bool)GetValue(IsInEditModeProperty); }
set { SetValue(IsInEditModeProperty, value); }
}
绑定测试:
<wpfApplication4:EditableTextBox IsInEditMode="{Binding Path=EditMode, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Window}}">
ViewModel:
private bool editMode;
public bool EditMode
{
get { return editMode; }
set
{
editMode = value;
OnPropertyChanged();
}
}
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