C# Avalonia 11- DragInCanvasTest

使用开源例子，小小修改了下，使用了动态加载Behavior的方法。

https://github.com/wieslawsoltes/Xaml.Behaviors

DragInCanvasTest.axaml代码

<Window xmlns="https://github.com/avaloniaui"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"Height="600" Width="450"x:Class="AvaloniaUI.DragInCanvasTest"Title="DragInCanvasTest"><!--https://github.com/wieslawsoltes/Xaml.Behaviors--><StackPanel Margin="5" Spacing="12"><TextBlock Text="MouseDragElementBehavior" HorizontalAlignment="Center"/><Canvas Width="300" Height="120" Background="LightGray"><Rectangle Fill="Red" Width="40" Height="40" Canvas.Left="20" Canvas.Top="20"><Interaction.Behaviors><MouseDragElementBehavior ConstrainToParentBounds="True" /></Interaction.Behaviors></Rectangle><Rectangle Fill="Green" Width="40" Height="40" Canvas.Left="120" Canvas.Top="20"><Interaction.Behaviors><MouseDragElementBehavior ConstrainToParentBounds="True" /></Interaction.Behaviors></Rectangle></Canvas><TextBlock Text="MultiMouseDragElementBehavior" HorizontalAlignment="Center"/><Canvas Width="300" Height="120" Background="LightGray"><Rectangle x:Name="MultiRect1" Fill="Blue" Width="40" Height="40" Canvas.Left="30" Canvas.Top="30"/><Rectangle x:Name="MultiRect2" Fill="Orange" Width="40" Height="40" Canvas.Left="90" Canvas.Top="40"/><Rectangle x:Name="MultiRect3" Fill="Purple" Width="40" Height="40" Canvas.Left="150" Canvas.Top="50"/></Canvas></StackPanel>
</Window>

DragInCanvasTest.axaml.cs代码

using Avalonia;
using Avalonia.Controls;
using Avalonia.Markup.Xaml;
using Avalonia.Xaml.Interactions.Draggable;
using Avalonia.Xaml.Interactivity;
using System.Linq;namespace AvaloniaUI;public partial class DragInCanvasTest : Window
{public DragInCanvasTest(){InitializeComponent();var rect1 = this.FindControl<Control>("MultiRect1");var rect2 = this.FindControl<Control>("MultiRect2");var rect3 = this.FindControl<Control>("MultiRect3");//动态添加BehaviorsInteraction.GetBehaviors(rect1!).Add(new MultiMouseDragElementBehavior() { ConstrainToParentBounds = true });//MultiRect1(rect1)是唯一点击控件if (rect1 is not null && rect2 is not null && rect3 is not null){var behavior = Interaction.GetBehaviors(rect1).OfType<MultiMouseDragElementBehavior>().FirstOrDefault();if (behavior is not null){behavior.TargetControls.Add(rect2);behavior.TargetControls.Add(rect3);}}}
}

运行效果