如何解决释放鼠标按钮并扩展选择模式时如何在 WPF Listview 中进行选择更改
我在创建 WPF 应用程序期间正在学习 MVVM 模式。不幸的是,我遇到了一点障碍。我想在释放鼠标按钮时更改列表视图中的选择。我找到了一个解决方案 here,但它仅在选择模式为 SIngle 时有效。我必须在以下代码中更改哪些内容才能使用扩展选择模式。提前致谢。
public static class SelectorBehavior
{
#region bool ShouldSelectItemonmouseup
public static readonly DependencyProperty ShouldSelectItemonmouseupProperty =
DependencyProperty.Registerattached(
"ShouldSelectItemonmouseup",typeof(bool),typeof(SelectorBehavior),new PropertyMetadata(default(bool),HandleShouldSelectItemonmouseupChange));
public static void SetShouldSelectItemonmouseup(DependencyObject element,bool value)
{
element.SetValue(ShouldSelectItemonmouseupProperty,value);
}
public static bool GetShouldSelectItemonmouseup(DependencyObject element)
{
return (bool)element.GetValue(ShouldSelectItemonmouseupProperty);
}
private static void HandleShouldSelectItemonmouseupChange(
DependencyObject d,DependencyPropertyChangedEventArgs e)
{
if (d is Selector selector)
{
selector.PreviewMouseDown -= HandleSelectPreviewMouseDown;
selector.MouseUp -= HandleSelectMouseUp;
if (Equals(e.NewValue,true))
{
selector.PreviewMouseDown += HandleSelectPreviewMouseDown;
selector.MouseUp += HandleSelectMouseUp;
}
}
}
private static void HandleSelectMouseUp(object sender,MouseButtonEventArgs e)
{
var selector = (Selector)sender;
if (e.ChangedButton == MouseButton.Left && e.OriginalSource is Visual source)
{
var container = selector.ContainerfromElement(source);
if (container != null)
{
var index = selector.ItemContainerGenerator.IndexFromContainer(container);
if (index >= 0)
{
selector.Selectedindex = index;
}
}
}
}
private static void HandleSelectPreviewMouseDown(object sender,MouseButtonEventArgs e)
{
e.Handled = e.ChangedButton == MouseButton.Left;
}
#endregion
}
XAML:
<ListBox ItemsSource="{Binding viewmodelItems}"
SelectedItem="{Binding SelectedviewmodelItem}"
ui:SelectorBehavior.ShouldSelectItemonmouseup="True" />
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