为什么在我的ListBox拖放中文本颜色不变？
为什么在我的ListBox拖放中文本颜色不变？
提问于 2014-09-24 18:12:06
我正在尝试从一个列表拖放到另一个列表。我尝试了下面的代码。它可以正确地拖放，但不会更改拖放到另一个列表中的文本的颜色。(我希望放置在旁边的文本的颜色发生变化，这样就可以配置知道哪个文本被放置了(假设是蓝色))。
我的MainPage.xaml是这样的：
<UserControl x:Class="Silverlight4.DragDropListBox.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:toolKit="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Toolkit"
xmlns:local="clr-namespace:Silverlight4.DragDropListBox">
<UserControl.Resources>
<local:StyleFunctionConverter x:Key="StyleFunctionConverter"/>
</UserControl.Resources>
<Grid x:Name="LayoutRoot" Background="White" HorizontalAlignment="Center" VerticalAlignment="Center">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<TextBlock Text="Drag & Drop ListBox Demo" FontSize="20" FontWeight="Bold" Foreground="Red" Margin="10" Grid.Row="0"/>
<StackPanel Orientation="Horizontal" Margin="10" Grid.Row="1">
<toolKit:ListBoxDragDropTarget AllowDrop="True">
<ListBox x:Name="customerListBoxMain" Height="200" Width="200"
DisplayMemberPath="Name" Style="{Binding IsInGroup, Converter={StaticResource StyleFunctionConverter}}">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Vertical"/>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
</toolKit:ListBoxDragDropTarget>
<TextBlock Width="20" />
<toolKit:ListBoxDragDropTarget AllowDrop="True">
<ListBox Height="200" Width="200" DisplayMemberPath="Name" Style="{Binding IsInGroup, Converter={StaticResource StyleFunctionConverter}}">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Vertical"/>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
</toolKit:ListBoxDragDropTarget>
</StackPanel>
</Grid>
</UserControl>MainPage.Xaml.cs类是：
public partial class MainPage : UserControl
{
public MainPage()
{
InitializeComponent();
customerListBoxMain.ItemsSource = PersonDataProvider.GetData();
}
}PersonDataProvider.cs类是：
public class PersonDataProvider
{
public static ObservableCollection<Person> GetData()
{
return new ObservableCollection<Person>
{
new Person { Name = "Akash Sharma" },
new Person { Name = "Vinay Sen" },
new Person { Name = "Lalit Narayan" },
new Person { Name = "Madhumita Chatterjee" },
new Person { Name = "Priyanka Patil" },
new Person { Name = "Kumar Sanu" },
new Person { Name = "Victor Kapoor" },
new Person { Name = "Shymal Sen" },
new Person { Name = "Alan D'Souza" },
new Person { Name = "Kamal Saha" },
new Person { Name = "Alex Chan" },
new Person { Name = "Rohit Sharma" },
new Person { Name = "Dipti Sen" },
new Person { Name = "Dinesh Sharma" },
new Person { Name = "Kamal Kapoor" },
new Person { Name = "Raj Kapoor" },
new Person { Name = "Deepa Karmakar" },
new Person { Name = "Sarmishtha Chakrobarty" },
new Person { Name = "Pranab Kumar Debnath" },
new Person { Name = "Hiral Grover" },
new Person { Name = "Munmun Patel" },
new Person { Name = "Santosh Kumar Sen" },
new Person { Name = "Sandeep Debnath" }
};
}
}和Person.cs (模型为)
public class Person
{
public string Name { get; set; }
}和Styles.xaml (资源字典)
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Style x:Key="ListBoxTextNormalItem" TargetType="TextBlock">
<Setter Property="Foreground">
<Setter.Value>
<SolidColorBrush Color='Blue' />
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>App.xaml是：
<Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="Silverlight4.DragDropListBox.App">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Styles.xaml"></ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
And StyleFunctionConverter.cs is:
public class StyleFunctionConverter : IValueConverter
{
public Object Convert(Object value, Type targetType, Object parameter, CultureInfo culture)
{
if (value == null)
return null;
bool isInGroup = (bool)value;
if (isInGroup)
return Application.Current.Resources["ListBoxTextNormalItem"];
else
return Application.Current.Resources["ListBoxTextChangeItem"];
}
public Object ConvertBack(Object value, Type targetType, Object parameter, CultureInfo culture)
{
return null;
}
}如何将拖放文本的颜色设置为<SolidColorBrush Color='Blue' />？
回答 1
Stack Overflow用户
发布于 2014-09-24 19:17:54
我宁愿在XAML中使用DataTriggers，而不是绑定您的样式。这样，您就可以根据可以通过绑定访问的数据来更改样式。
如下所示：
<ListBox>
<ListBox.Resources>
<Style TargetType="ListBoxItem">
<Setter Property="Foreground" Value="Green" />
<Style.Triggers>
<DataTrigger Binding="{Binding Path=DataContext.IsInGroup}" Value="True">
<Setter Property="Foreground" Value="Blue"></Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</ListBox.Resources>
</ListBox>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/26014265
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