WPF 控件的缩放和移动

1.页面代码

<ContentControl ClipToBounds="True" Cursor="SizeAll"><Viewboxx:Name="viewbox"MouseDown="viewbox_MouseDown"MouseMove="viewbox_MouseMove"MouseWheel="Viewbox_MouseWheel"><Viewbox.RenderTransform><TransformGroup><!--  将下面的三种转换组合到一起  --><ScaleTransform x:Name="scaler"/><TranslateTransform x:Name="transer" /></TransformGroup></Viewbox.RenderTransform><Image Name="image" Source="{Binding ImageSource, RelativeSource={RelativeSource AncestorType=UserControl, Mode=FindAncestor}}" /></Viewbox></ContentControl>

ScaleTransform 用于进行缩放

TranslateTransform 用于进行位置的移动

ViewBox中可以放入不同的控件不光可以是图片

ContentControl 可以对超过容器的部分进行剪切,这样就不会覆盖到其他控件了

2.后台代码

public partial class ImageSuper : UserControl
{public ImageSuper(){InitializeComponent();}public ImageSource ImageSource{get { return (ImageSource)GetValue(ImageSourceProperty); }set { SetValue(ImageSourceProperty, value); }}public static readonly DependencyProperty ImageSourceProperty =DependencyProperty.Register("ImageSource", typeof(ImageSource), typeof(ImageSuper), null);public double Scale{get { return (double)GetValue(ScaleProperty); }set { SetValue(ScaleProperty, value); }}public static readonly DependencyProperty ScaleProperty =DependencyProperty.Register("Scale", typeof(double), typeof(ImageSuper),new PropertyMetadata(default(double), new PropertyChangedCallback(ScalePropertyChanged)));public double TranserX{get { return (double)GetValue(TranserXProperty); }set { SetValue(TranserXProperty, value); }}public static readonly DependencyProperty TranserXProperty =DependencyProperty.Register("TranserX", typeof(double), typeof(ImageSuper),new PropertyMetadata(default(double), new PropertyChangedCallback(TranserPropertyChanged)));public double TranserY{get { return (double)GetValue(TranserYProperty); }set { SetValue(TranserYProperty, value); }}public static readonly DependencyProperty TranserYProperty =DependencyProperty.Register("TranserY", typeof(double), typeof(ImageSuper),new PropertyMetadata(default(double), new PropertyChangedCallback(TranserPropertyChanged)));public static void ScalePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e){(d as ImageSuper).DoScale();}public static void TranserPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e){(d as ImageSuper).DoMove();}/// <summary>/// 缩放图片。最小为0.1倍，最大为0倍/// </summary>private void DoScale(){// 限制最大、最小缩放倍数if (scaler.ScaleX + Scale < 0.1 || scaler.ScaleX + Scale > 80) return;scaler.ScaleX = Scale;scaler.ScaleY = Scale;}/// <summary>/// 移动图片/// </summary>private void DoMove(){transer.X = TranserX;transer.Y = TranserY;}private void Viewbox_MouseWheel(object sender, MouseWheelEventArgs e){var point = e.GetPosition(viewbox);var delta = e.Delta * 0.002;Scale += delta;TranserX -= point.X * delta;TranserY -= point.Y * delta;}private Point lastMousePosition;private void viewbox_MouseDown(object sender, MouseButtonEventArgs e){Point currentMousePosition = e.GetPosition(image);lastMousePosition = currentMousePosition;}private void viewbox_MouseMove(object sender, MouseEventArgs e){if (e.LeftButton == MouseButtonState.Pressed){// 获取鼠标相对于图片的位置Point currentMousePosition = e.GetPosition(image);// 获取鼠标在X轴和Y轴上的移动距离double deltaX = currentMousePosition.X - lastMousePosition.X;double deltaY = currentMousePosition.Y - lastMousePosition.Y;TranserX += deltaX / 10;TranserY += deltaY / 10;}}
}