support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Controls/Window/ImageBrowser.cs

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+using System;
+using System.IO;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Input;
+using System.Windows.Media.Imaging;
+using HandyControl.Data;
+using HandyControl.Interactivity;
+
+namespace HandyControl.Controls
+{
+    /// <summary>
+    ///     图片浏览器
+    /// </summary>
+    [TemplatePart(Name = ElementGridTop, Type = typeof(Grid))]
+    [TemplatePart(Name = ElementImageViewer, Type = typeof(ImageViewer))]
+    public class ImageBrowser : Window
+    {
+        #region Constants
+
+        private const string ElementGridTop = "PART_GridTop";
+
+        private const string ElementImageViewer = "PART_ImageViewer";
+
+        #endregion Constants
+
+        #region Data
+
+        private Grid _gridTop;
+
+        private ImageViewer _imageViewer;
+
+        #endregion Data
+
+        static ImageBrowser()
+        {
+            IsFullScreenProperty.AddOwner(typeof(ImageBrowser), new PropertyMetadata(ValueBoxes.FalseBox));
+        }    
+
+        public ImageBrowser()
+        {
+            CommandBindings.Add(new CommandBinding(ControlCommands.Close, ButtonClose_OnClick));
+
+            WindowStartupLocation = WindowStartupLocation.CenterScreen;
+            WindowStyle = WindowStyle.None;
+            AllowsTransparency = true;
+        }
+
+        /// <summary>
+        ///     带一个图片Uri的构造函数
+        /// </summary>
+        /// <param name="uri"></param>
+        public ImageBrowser(Uri uri) : this()
+        {
+            Loaded += (s, e) =>
+            {
+                try
+                {
+                    _imageViewer.ImageSource = BitmapFrame.Create(uri);
+                    _imageViewer.ImgPath = uri.AbsolutePath;
+                    if (File.Exists(_imageViewer.ImgPath))
+                    {
+                        var info = new FileInfo(_imageViewer.ImgPath);
+                        _imageViewer.ImgSize = info.Length;
+                    }
+                }
+                catch
+                {
+                    MessageBox.Show(Properties.Langs.Lang.ErrorImgPath);
+                }
+            };
+        }
+
+        /// <summary>
+        ///     带一个图片路径的构造函数
+        /// </summary>
+        /// <param name="path"></param>
+        public ImageBrowser(string path) : this(new Uri(path))
+        {
+
+        }
+
+        public override void OnApplyTemplate()
+        {
+            if (_gridTop != null)
+            {
+                _gridTop.MouseLeftButtonDown -= GridTop_OnMouseLeftButtonDown;
+            }
+
+            if (_imageViewer != null)
+            {
+                _imageViewer.MouseLeftButtonDown -= ImageViewer_MouseLeftButtonDown;
+            }
+
+            base.OnApplyTemplate();
+
+            _gridTop = GetTemplateChild(ElementGridTop) as Grid;
+            _imageViewer = GetTemplateChild(ElementImageViewer) as ImageViewer;
+
+            if (_gridTop != null)
+            {
+                _gridTop.MouseLeftButtonDown += GridTop_OnMouseLeftButtonDown;
+            }
+
+            if (_imageViewer != null)
+            {
+                _imageViewer.MouseLeftButtonDown += ImageViewer_MouseLeftButtonDown;
+            }
+        }
+
+        private void ButtonClose_OnClick(object sender, RoutedEventArgs e) => Close();
+
+        private void GridTop_OnMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
+        {
+            if (e.LeftButton == MouseButtonState.Pressed)
+            {
+                DragMove();
+            }
+        }
+
+        private void ImageViewer_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
+        {
+            if (e.LeftButton == MouseButtonState.Pressed && !(_imageViewer.ImageWidth > ActualWidth || _imageViewer.ImageHeight > ActualHeight))
+            {
+                DragMove();
+            }
+        }
+    }
+}