今天遇到一个需求，要求能对可拖动的对象提供二种模式：允许拖动、禁止拖动。
之前的拖动为了省事，直接用了：Blend自带的MouseDragElementBehavior，于是就需要在cs代码中控制这个东东了。
折腾了一下，还算简单：
xaml代码
代码语言：javascript复制<UserControl
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:i="http://schemas.microsoft.com/expression/2010/interactivity" xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions" x:Class="slTest.MainPage"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400">
<Grid x:Name="LayoutRoot" Background="White">
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition MinHeight="22" Height="Auto"/>
</Grid.RowDefinitions>
<Canvas Background="Navy" x:Name="c" Cursor="Hand">
<i:Interaction.Behaviors>
<ei:MouseDragElementBehavior/>
</i:Interaction.Behaviors>
<TextBlock Foreground="White" FontSize="24">点击拖动Canvas</TextBlock>
</Canvas>
<StackPanel Grid.Row="1" Orientation="Horizontal" HorizontalAlignment="Center" Margin="0,5">
<Button Width="80" Content="允许拖动" x:Name="btnEnable" Click="btnEnable_Click"/>
<Button Width="80" Content="禁止拖动" Margin="5,0,0,0" x:Name="btnDisable" Click="btnDisable_Click"/>
</StackPanel>
</Grid>
</UserControl>xaml.cs代码
代码语言：javascript复制using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Interactivity;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Expression.Interactivity;
using Microsoft.Expression.Interactivity.Layout;
namespace slTest
{
public partial class MainPage : UserControl
{
public MainPage()
{
InitializeComponent();
}
private void btnEnable_Click(object sender, RoutedEventArgs e)
{
var behaviorsCollection = Interaction.GetBehaviors(c);
if (behaviorsCollection.Count>0)
{
var behavior = behaviorsCollection[0] as MouseDragElementBehavior;
if (behavior!=null){
behavior.Attach(c);
}
}
}
private void btnDisable_Click(object sender, RoutedEventArgs e)
{
var behaviorsCollection = Interaction.GetBehaviors(c);
if (behaviorsCollection.Count > 0)
{
var behavior = behaviorsCollection[0] as MouseDragElementBehavior;
if (behavior!=null){
behavior.Detach();
}
}
}
}
}
