小编use*_*976的帖子

<utils:ScrollViewer x:Name="ImageViewer" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto" Grid.Row="2"                                                                   
                                       CurrentHorizontalOffset="{Binding ScrollHorizontalValue, Mode=TwoWay}"
                                       CurrentVerticalOffset="{Binding ScrollVerticalValue, Mode=TwoWay}"                                        
                                       >
                    <i:Interaction.Triggers>
                        <i:EventTrigger EventName="PreviewMouseWheel">
                            <cmd:EventToCommand Command="{Binding MouseWheelZoomCommand}" PassEventArgsToCommand="True"/>
                        </i:EventTrigger>
                        <i:EventTrigger EventName="ScrollChanged">
                            <cmd:EventToCommand Command="{Binding ScrollChangedCommand}" PassEventArgsToCommand="True"/>
                        </i:EventTrigger>
                    </i:Interaction.Triggers>
                    <Grid Background="{StaticResource ThatchBackground}" RenderTransformOrigin="0.5,0.5">
                        <ItemsControl ItemsSource="{Binding CanvasItems}" ItemTemplate="{StaticResource templateOfROI}">
                            <ItemsControl.ItemsPanel>
                                <ItemsPanelTemplate>
                                    <Canvas x:Name="BackPanel"
                                        Width="{Binding DataContext.ImageWidth, ElementName=MainGrid}" 
                                        Height="{Binding DataContext.ImageHeight, ElementName=MainGrid}"
                                        ClipToBounds="True">
                                        <Canvas.Background>
                                            <ImageBrush x:Name="BackImage"
                                                        ImageSource="{Binding DataContext.SelectedImage.Path, ElementName=MainGrid}"/>
                                        </Canvas.Background>

                                        <i:Interaction.Triggers>
                                            <i:EventTrigger EventName="MouseRightButtonDown">
                                                <cmd:EventToCommand Command="{Binding DataContext.MouseRightCommand, ElementName=MainGrid}"/>
                                            </i:EventTrigger>
                                            <i:EventTrigger EventName="MouseLeftButtonDown">
                                                <cmd:EventToCommand Command="{Binding DataContext.MouseMoveStartCommand, ElementName=MainGrid}" PassEventArgsToCommand="True"/>
                                            </i:EventTrigger>
                                            <i:EventTrigger EventName="MouseMove">
                                                <cmd:EventToCommand Command="{Binding DataContext.MouseMovingCommand, ElementName=MainGrid}" PassEventArgsToCommand="True"/>
                                            </i:EventTrigger>
                                            <i:EventTrigger …