在 WPF 中，我正在为我的 TODO 程序创建一个简单的自定义控件。它应该执行以下操作:
- 显示为一个列表框，上面有一个添加和删除按钮。
- 添加和删除按钮应该从我的基类中添加和删除项目。
- 我有这个工作
- 按 F2 键后，我希望列表框项变为 TextBox 控件。
我的主要问题/问题是:
- 在 OnKeyDown 上，我收到错误:此操作仅对应用此模板的元素有效。我该如何解决这个问题？这是我想按 F2 键的地方，以便能够使 TextBox 可见而 Label 不可见。
有更好的方法吗？如果我的控件是按钮和文本框的容器，我不应该继承自 ListBox 吗？我应该从 Control 继承并使它成为一个容器吗？
- 如果是这样，我如何实现它？我是否主要在样式中使用以下代码，并删除 OnKeyDown 等覆盖，而是为文本框注册 KeyDown 事件？我会在这篇文章后尝试一下，但如果您有任何建议，请告诉我。
我之前有一些接近的工作，在下面的代码中，但现在我希望它从我的主 Window XAML 移动到自定义控件代码，我希望能够在按下按钮时进行编辑:
<!-- In my MainWindow.XAML -->
<TaskDashControls:ListBoxWithAddRemove x:Name="listBoxItems" Grid.Row="1" Grid.Column="3" Grid.RowSpan="3"
ItemsSource="{Binding}">
<TaskDashControls:ListBoxWithAddRemove.ItemTemplate>
<DataTemplate>
<DockPanel>
<Button DockPanel.Dock="Left" Click="SelectItemClick">SELECT</Button>
<TextBlock x:Name="LabelDescription" Visibility="Visible" DockPanel.Dock="Left" Text="{Binding Description}" Height="25" Width="150" />
<TextBox x:Name="EditableDescription" Visibility="Collapsed" DockPanel.Dock="Left" Text="{Binding Description}" Height="25" Width="150" />
<Button DockPanel.Dock="Left" Click="EditTaskItemClick">EDIT</Button>
</DockPanel>
</DataTemplate>
</TaskDashControls:ListBoxWithAddRemove.ItemTemplate>
</TaskDashControls:ListBoxWithAddRemove>
我现在删除了 DataTemplate，将其移至自定义控件:
<!-- In my MainWindow.XAML -->
<TaskDashControls:ListBoxWithAddRemove x:Name="listBoxItems" Grid.Row="1" Grid.Column="3" Grid.RowSpan="3"
ItemsSource="{Binding}"/>
这是 Generic.XAML 中的自定义控件:
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:TaskDash.Controls">
<SolidColorBrush x:Key="WindowBackgroundBrush" Color="#FFF" />
<SolidColorBrush x:Key="SolidBorderBrush" Color="#888" />
<SolidColorBrush x:Key="DisabledForegroundBrush" Color="#888" />
<SolidColorBrush x:Key="DisabledBackgroundBrush" Color="#EEE" />
<SolidColorBrush x:Key="DisabledBorderBrush" Color="#AAA" />
<Style TargetType="{x:Type TextBox}">
<Setter Property="Margin" Value="2" />
</Style>
<Style x:Key="{x:Type local:ListBoxWithAddRemove}" TargetType="{x:Type local:ListBoxWithAddRemove}">
<Setter Property="Margin" Value="3" />
<Setter Property="SnapsToDevicePixels" Value="True"/>
<Setter Property="KeyboardNavigation.TabNavigation" Value="None"/>
<Setter Property="FocusVisualStyle" Value="{x:Null}"/>
<Setter Property="MinWidth" Value="120"/>
<Setter Property="MinHeight" Value="20"/>
<Setter Property="AllowDrop" Value="true"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="25" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<!--<Button Grid.Column="0" Grid.Row="0" x:Name="DeleteButton"
Click="DeleteControlClick">Delete</Button>
<Button Grid.Column="1" Grid.Row="0" x:Name="AddButton"
Click="AddControlClick">Add</Button>-->
<Button Grid.Column="0" Grid.Row="0" x:Name="DeleteButton">Delete</Button>
<Button Grid.Column="1" Grid.Row="0" x:Name="AddButton">Add</Button>
<Border
Grid.Column="0" Grid.Row="1" Grid.ColumnSpan="2"
Name="Border"
Background="{StaticResource WindowBackgroundBrush}"
BorderBrush="{StaticResource SolidBorderBrush}"
BorderThickness="1"
CornerRadius="2">
<ScrollViewer
Margin="0"
Focusable="false">
<StackPanel Margin="0" IsItemsHost="True" />
</ScrollViewer>
<!--<ListBox ItemTemplate="{TemplateBinding ItemTemplate}">
<DataTemplate>
<DockPanel>
<TextBlock x:Name="LabelDescription" Visibility="Visible" DockPanel.Dock="Left" Text="{Binding Description}" Height="25" Width="150" />
<TextBox x:Name="EditableDescription" DockPanel.Dock="Left" Text="{Binding Description}" Height="25" Width="150" />
</DockPanel>
</DataTemplate>
</ListBox>-->
</Border>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
这是我的自定义控件类
using System;
using System.Windows;
using System.Windows.Controls;
namespace TaskDash.Controls
{
[TemplatePart(Name = "Text", Type = typeof(TextBox))]
[TemplatePart(Name = "LabelText", Type = typeof(TextBlock))]
public class TextBoxWithDescription : Control
{
static TextBoxWithDescription()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(TextBoxWithDescription), new FrameworkPropertyMetadata(typeof(TextBoxWithDescription)));
}
public TextBoxWithDescription()
{
LabelText = String.Empty;
Text = String.Empty;
}
public static readonly DependencyProperty LabelTextProperty =
DependencyProperty.Register("LabelText", typeof(string), typeof(TextBoxWithDescription),
new PropertyMetadata(string.Empty, OnLabelTextPropertyChanged));
private static void OnLabelTextPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
}
public string LabelText
{
get { return GetValue(LabelTextProperty).ToString(); ; }
set { SetValue(LabelTextProperty, value); }
}
// http://xamlcoder.com/cs/blogs/joe/archive/2007/12/13/building-custom-template-able-wpf-controls.aspx
public static readonly DependencyProperty TextProperty =
DependencyProperty.Register("Text", typeof(string), typeof(TextBoxWithDescription),
new UIPropertyMetadata(null,
new PropertyChangedCallback(OnTextChanged)
));
private static void OnTextChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
TextBoxWithDescription textBox = o as TextBoxWithDescription;
if (textBox != null)
textBox.OnTextChanged((String)e.OldValue, (String)e.NewValue);
}
protected virtual void OnTextChanged(String oldValue, String newValue)
{
// fire text changed event
this.Text = newValue;
this.RaiseEvent(new RoutedEventArgs(TextChangedEvent, this));
}
public string Text
{
get { return GetValue(TextProperty).ToString(); }
set { SetValue(TextProperty, value); }
}
public static readonly RoutedEvent TextChangedEvent =
EventManager.RegisterRoutedEvent("TextChanged",
RoutingStrategy.Bubble,
typeof(RoutedEventHandler),
typeof(TextBoxWithDescription));
public event RoutedEventHandler TextChanged
{
add { AddHandler(TextChangedEvent, value); }
remove { RemoveHandler(TextChangedEvent, value); }
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
//var textBlock = (TextBlock)this.Template.FindName("LabelText", this);
//if (textBlock != null) textBlock.Text = this.LabelText;
//var textBox = (TextBox)this.Template.FindName("Text", this);
//if (textBox != null) textBox.Text = this.Text;
}
}
}
最佳答案
我将为 TODO 创建一个类，其属性为:String Desc、Visibility txtBox、Visibility txtBlock。然后 TaskDashControls 的项目源是 List TODO。在 xaml 中，您可以绑定(bind)可见性属性。在 TODO 类中，您可以控制一个可见时另一个不可见。
关于c# - WPF ListBox 自定义控件问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/7047884/