WPF ImageControl描边图片 

 1     [TemplatePart(Name = "PART_Highlight", Type = typeof(Image))]
 2     public class ImageControl : Control
 3     {
 4         Image HighLightImage = null;
 5 
 6         public bool IsHighLight
 7         {
 8             get { return (bool)GetValue(IsHighLightProperty); }
 9             set { SetValue(IsHighLightProperty, value); }
10         }
11 
12         public static readonly DependencyProperty IsHighLightProperty =
13             DependencyProperty.Register("IsHighLight", typeof(bool), typeof(ImageControl), new FrameworkPropertyMetadata(false, propertyChangedCallback: OnIsHighLightChanged));
14 
15         private static void OnIsHighLightChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
16         {
17             var ic = d as ImageControl;
18             if((bool)e.NewValue)
19             {
20                 ic.HighLightImage.Visibility = Visibility.Visible;
21                 string path = ic.Source.ToString().Replace("file:///", string.Empty);
22                 byte[] bs = null;
23                 using (var bitmap = new System.Drawing.Bitmap(path))
24                     bs = bitmap.GetVerge1(true);
25                 WriteableBitmap wb = new WriteableBitmap((int)ic.Source.Width + 2, (int)ic.Source.Height + 2, 96, 96, PixelFormats.Bgra32, null);
26                 wb.Lock();
27                 wb.WritePixels(new Int32Rect(0, 0, wb.PixelWidth, wb.PixelHeight), bs, wb.PixelWidth * 4, 0);
28                 wb.Unlock();
29                 ic.HighLightImage.Source = wb;
30             }
31             else
32             {
33                 ic.HighLightImage.Source = null;
34             }
35         }
36 
37         public ImageSource Source
38         {
39             get { return (ImageSource)GetValue(SourceProperty); }
40             set { SetValue(SourceProperty, value); }
41         }
42 
43         public static readonly DependencyProperty SourceProperty =
44             DependencyProperty.Register("Source", typeof(ImageSource), typeof(ImageControl), new FrameworkPropertyMetadata((ImageSource)null));
45 
46         public override void OnApplyTemplate()
47         {
48             base.OnApplyTemplate();
49             HighLightImage = GetTemplateChild("PART_Highlight") as Image;
50         }
51 
52         protected override void OnMouseEnter(MouseEventArgs e)
53         {
54             IsHighLight = true;
55             base.OnMouseEnter(e);
56         }
57 
58         protected override void OnMouseLeave(MouseEventArgs e)
59         {
60             IsHighLight = false;
61             base.OnMouseLeave(e);
62         }
63     }

样式：

<Style TargetType="local:ImageControl">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="local:ImageControl">
                        <Canvas>
                            <Image Source="{TemplateBinding Source}"/>
                            <Image Name="PART_Highlight" IsHitTestVisible="False" Canvas.Left="-1" Canvas.Top="-1"/>
                        </Canvas>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

使用：

<local:ImageControl x:Name="img" Source="D:\1.png" />

 

posted @ 2022-04-01 16:56  HotSky  阅读(107)  评论(0)  编辑  收藏  举报