Initial commit

DragDropViewer/DragDropViewer.csproj

@@ -44,14 +44,17 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
-    <Compile Include="Form1.cs">
+    <Compile Include="MainForm.cs">
       <SubType>Form</SubType>
     </Compile>
-    <Compile Include="Form1.Designer.cs">
-      <DependentUpon>Form1.cs</DependentUpon>
+    <Compile Include="MainForm.Designer.cs">
+      <DependentUpon>MainForm.cs</DependentUpon>
     </Compile>
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <EmbeddedResource Include="MainForm.resx">
+      <DependentUpon>MainForm.cs</DependentUpon>
+    </EmbeddedResource>
     <EmbeddedResource Include="Properties\Resources.resx">
       <Generator>ResXFileCodeGenerator</Generator>
       <LastGenOutput>Resources.Designer.cs</LastGenOutput>

DragDropViewer/MainForm.cs

@@ -0,0 +1,177 @@
+using System;
+using System.Drawing;
+using System.IO;
+using System.Text;
+using System.Windows.Forms;
+
+namespace DragDropViewer {
+  public partial class MainForm : Form {
+    #region Fields
+    private Control preview;
+    #endregion
+
+    #region Properties
+    private Control PreviewControl {
+      get {
+        return preview;
+      }
+      set {
+        var current = PreviewControl;
+        if (current != null) {
+          tableLayoutPanel1.Controls.Remove(current);
+          current.Dispose();
+          current = null;
+        }
+
+        preview = value;
+
+        if (preview != null) {
+          // Some special cases
+          if (preview is TextBoxBase) {
+            ((TextBoxBase)preview).Multiline = true;
+          }
+
+          value.Dock = DockStyle.Fill;
+
+          tableLayoutPanel1.Controls.Add(value, 1, 1);
+          tableLayoutPanel1.SetRowSpan(value, 2);
+        }
+      }
+    }
+
+    private DataFormat SelectedItem {
+      get {
+        return listFormats.SelectedIndex == -1 ? null : (DataFormat)listFormats.SelectedItem;
+      }
+    }
+    #endregion
+
+    #region Constructors
+    public MainForm() {
+      InitializeComponent();
+    }
+    #endregion
+
+    #region Methods
+    private void LoadData(IDataObject data) {
+      listFormats.SelectedIndexChanged -= listFormats_SelectedIndexChanged;
+      listFormats.BeginUpdate();
+
+      listFormats.Items.Clear();
+      if (data != null) {
+        foreach (var fmt in data.GetFormats(true)) {
+          var item = new DataFormat() {
+            Data = data.GetData(fmt),
+            Name = fmt
+          };
+          listFormats.Items.Add(item);
+        }
+      }
+
+      listFormats.EndUpdate();
+      listFormats.SelectedIndex = -1;
+      listFormats.SelectedIndexChanged += listFormats_SelectedIndexChanged;
+
+    }
+
+    private void OnSelectedItemChanged() {
+      var selected = SelectedItem;
+
+      propertyGrid.SelectedObject = selected?.Data;
+
+      if ((selected == null) || (selected.Data == null)) {
+        PreviewControl = null;
+        return;
+      }
+
+      if (selected.Name == "Rich Text Format") {
+        PreviewControl = new RichTextBox() {
+          Rtf = (string)selected.Data
+        };
+
+      } else if (selected.Name == "text/html") {
+        var stream = selected.Data as Stream;
+        stream.Position = 0;
+
+        PreviewControl = new WebBrowser() {
+          DocumentStream = stream
+        };
+
+      } else if (selected.Type == typeof(string)) {
+        PreviewControl = new TextBox() {
+          Text = (string)selected.Data
+        };
+
+      } else if (selected.Type == typeof(string[])) {
+        PreviewControl = new TextBox() {
+          Lines = (string[])selected.Data
+        };
+
+      } else if (selected.Type == typeof(MemoryStream)) {
+        var ms = selected.Data as MemoryStream;
+        ms.Position = 0;
+
+        Encoding enc;
+        if (
+          selected.Name.EndsWith("W")
+          || selected.Name.Contains("x-moz")
+          ) {
+          enc = Encoding.Unicode;
+        } else {
+          enc = Encoding.UTF8;
+        }
+
+        using (var reader = new StreamReader(ms, enc, true, 1024, true)) {
+          PreviewControl = new TextBox() {
+            Text = reader.ReadToEnd()
+          };
+        }
+
+      } else if (selected.Type == typeof(Bitmap)) {
+        PreviewControl = new PictureBox() {
+          Image = (Bitmap)selected.Data,
+          SizeMode = PictureBoxSizeMode.Zoom
+        };
+
+      } else {
+        PreviewControl = null;
+      }
+
+    }
+    #endregion
+
+    #region Event handlers
+    private void butFromClipboard_Click(object sender, EventArgs e) {
+      LoadData(Clipboard.GetDataObject());
+    }
+
+    private void listFormats_SelectedIndexChanged(object sender, EventArgs e) {
+      OnSelectedItemChanged();
+    }
+
+    private void MainForm_DragEnter(object sender, DragEventArgs e) {
+      e.Effect = e.AllowedEffect;
+    }
+
+    private void MainForm_DragDrop(object sender, DragEventArgs e) {
+      LoadData(e.Data);
+    }
+    #endregion
+
+    #region Inner classes
+    public class DataFormat {
+      public object Data { get; set; }
+
+      public string Name { get; set; }
+
+      public Type Type => Data?.GetType();
+
+      public string TypeName => Type == null ? "null" : Type.Name;
+
+      public override string ToString() {
+        return $"{TypeName} {Name}";
+      }
+    }
+    #endregion
+  }
+}