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  1. using System;
  2. using System.Collections.Generic;
  3. using System.ComponentModel;
  4. using System.Drawing;
  5. using System.Data;
  6. using System.Linq;
  7. using System.Text;
  8. using System.Windows.Forms;
  9. using System.Runtime.InteropServices;
  10.  
  11. namespace IconFreeArrangementPanel
  12. {
  13.     public partial class FreeListView : ListView
  14.     {
  15.         [DllImport("comctl32.dll")]
  16.         private static extern bool ImageList_BeginDrag(IntPtr imageList,
  17.                                                        int index, int x, int y);
  18.         [DllImport("comctl32.dll")]
  19.         private static extern void ImageList_EndDrag();
  20.         [DllImport("comctl32.dll")]
  21.         private static extern bool ImageList_DragEnter(IntPtr window, int x, int y);
  22.         [DllImport("comctl32.dll")]
  23.         private static extern bool ImageList_DragLeave(IntPtr window);
  24.         [DllImport("comctl32.dll")]
  25.         private static extern bool ImageList_DragMove(int x, int y);
  26.         [DllImport("comctl32.dll")]
  27.         private static extern bool ImageList_Destroy(IntPtr imgaeList);
  28.         [DllImport("comctl32.dll")]
  29.         private static extern IntPtr ImageList_Merge(IntPtr imgaeList1, int index1,
  30.                                                      IntPtr imageList2, int index2,
  31.                                                      int x, int y);
  32.         private IntPtr dragImage;
  33.         /// <summary> ドラッグする前のクリック位置(X座標) </summary>
  34.         private int pointX;
  35.         /// <summary> ドラッグする前のクリック位置(Y座標) </summary>
  36.         private int pointY;
  37.  
  38.         /// <summary>
  39.         /// コンストラクタ
  40.         /// </summary>
  41.         public FreeListView()
  42.         {
  43.             InitializeComponent();
  44.         }
  45.  
  46.         public FreeListView(string imageDir)
  47.             : this()
  48.         {
  49.             string[] jpgFiles =
  50.               System.IO.Directory.GetFiles(imageDir, "*.jpg");
  51.  
  52.             int width = 100;
  53.             int height = 80;
  54.  
  55.             imageList1.ImageSize = new Size(width, height);
  56.             this.LargeImageList = imageList1;
  57.  
  58.             Image original = null;
  59.             Image thumbnail = null;
  60.  
  61.             for (int i = 0; i < jpgFiles.Length; i++)
  62.             {
  63.                 original = Bitmap.FromFile(jpgFiles[i]);
  64.                 thumbnail = this.createThumbnail(original, width, height);
  65.  
  66.                 // ImageListのImage設定
  67.                 imageList1.Images.Add(thumbnail);
  68.                 // ListViewのラベル設定
  69.                 this.Items.Add("Item" + i, i);
  70.  
  71.                 original.Dispose();
  72.                 //thumbnail.Dispose();
  73.             }
  74.         }
  75.  
  76.         /// <summary>
  77.         /// 幅w、高さhのImageオブジェクトを作成
  78.         /// </summary>
  79.         /// <param name="image"></param>
  80.         /// <param name="w"></param>
  81.         /// <param name="h"></param>
  82.         /// <returns></returns>
  83.         public Image createThumbnail(Image image, int w, int h)
  84.         {
  85.             Bitmap canvas = new Bitmap(w, h);
  86.  
  87.             Graphics g = Graphics.FromImage(canvas);
  88.             g.FillRectangle(new SolidBrush(Color.White), 0, 0, w, h);
  89.  
  90.             float fw = (float)w / (float)image.Width;
  91.             float fh = (float)h / (float)image.Height;
  92.  
  93.             float scale = Math.Min(fw, fh);
  94.             fw = image.Width * scale;
  95.             fh = image.Height * scale;
  96.  
  97.             g.DrawImage(image, (w - fw) / 2, (h - fh) / 2, fw, fh);
  98.             g.Dispose();
  99.  
  100.             return canvas;
  101.         }
  102.  
  103.         /// <summary>
  104.         /// ドラッグ開始
  105.         /// </summary>
  106.         /// <param name="e"></param>
  107.         protected override void OnItemDrag(ItemDragEventArgs e)
  108.         {
  109.             base.OnItemDrag(e);
  110.             const int LvmCreateDragImage = 0x1000 + 33;
  111.             Point pos = Point.Empty;
  112.             foreach (ListViewItem item in this.SelectedItems)
  113.             {                
  114.                 IntPtr pp = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(Point)));
  115.                 Message m = Message.Create(this.Handle, LvmCreateDragImage,
  116.                                            new IntPtr(item.Index), pp);
  117.                 this.WndProc(ref m);
  118.                 Point p = (Point)Marshal.PtrToStructure(pp, typeof(Point));
  119.                 Marshal.FreeCoTaskMem(pp);
  120.                 if (this.dragImage.Equals(IntPtr.Zero))
  121.                 {
  122.                     this.dragImage = m.Result;
  123.                     pos = p;
  124.                 }
  125.                 else
  126.                 {
  127.                     IntPtr old = this.dragImage;
  128.                     this.dragImage = ImageList_Merge(old, 0, m.Result, 0,
  129.                                                      p.X - pos.X, p.Y - pos.Y);
  130.                     ImageList_Destroy(old);
  131.                     ImageList_Destroy(m.Result);
  132.                 }
  133.             }
  134.             Point view = this.PointToClient(Control.MousePosition);
  135.             ImageList_BeginDrag(dragImage, 0, view.X - pos.X, view.Y - pos.Y);
  136.             ImageList_DragEnter(this.Handle, view.X, view.Y);
  137.         }
  138.  
  139.         /// <summary>
  140.         /// コントロール上を移動
  141.         /// </summary>
  142.         /// <param name="e"></param>
  143.         protected override void OnMouseMove(MouseEventArgs e)
  144.         {
  145.             base.OnMouseMove(e);
  146.             if (dragImage != IntPtr.Zero)
  147.             {
  148.                 ImageList_DragMove(e.X, e.Y);
  149.             }
  150.         }
  151.  
  152.         /// <summary>
  153.         /// マウスボタンが離された(ドラッグ終了)
  154.         /// </summary>
  155.         /// <param name="e"></param>
  156.         protected override void OnMouseUp(MouseEventArgs e)
  157.         {
  158.             base.OnMouseUp(e);
  159.             if (dragImage != IntPtr.Zero)
  160.             {
  161.                 ImageList_DragLeave(this.Handle);
  162.                 ImageList_EndDrag();
  163.                 ImageList_Destroy(dragImage);
  164.                 dragImage = IntPtr.Zero;
  165.  
  166.                 foreach (ListViewItem srcItem in this.SelectedItems)
  167.                 {
  168.                     // ドロップ位置から挿入位置となるインデックス値を決定する
  169.                     ListViewItem item = this.GetItemAt(e.X, e.Y);
  170.                     int destIndex = this.Items.IndexOf(item);
  171.  
  172.                     // 項目の範囲外でドロップしたときは、最後尾に追加する様にインデックス値を設定
  173.                     if (destIndex < 0)
  174.                     {
  175.                         destIndex = this.Items.Count;
  176.                     }
  177.                     else if (destIndex > srcItem.Index)
  178.                     {                        
  179.                         destIndex++;
  180.                     }
  181.  
  182.                     ListViewItem newItem = this.Items.Insert(destIndex, (ListViewItem)srcItem.Clone());
  183.                     newItem.Selected = true;
  184.                     this.Items.Remove(srcItem);
  185.                 }
  186.             }
  187.         }
  188.     }
  189. }
  190.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.cs(4,14): error CS0234: The type or namespace name `Drawing' does not exist in the namespace `System'. Are you missing an assembly reference?
prog.cs(5,14): error CS0234: The type or namespace name `Data' does not exist in the namespace `System'. Are you missing an assembly reference?
prog.cs(8,14): error CS0234: The type or namespace name `Windows' does not exist in the namespace `System'. Are you missing an assembly reference?
Compilation failed: 3 error(s), 0 warnings
stdout
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Standard output is empty
https://ideone.com/X67yK
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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