ImageListView

介绍

ImageListView控件是用于显示图片列表的.Net控件。从外观及操作方式上看类似ListView控件。它使用多线程异步加载图片功能,

控件的外观也完全可以定制。

背景

该控件实际上是从重画ListView控件开始, 但是，第一个版本需要太多的方式去尝试, 特别是确定第一个或最后一个可见的项目被证明是一个挑战。由于这样或那样的问题，我决定推出自己的控件,于是诞生了ImageListView。

如何使用代码

在工具栏上添加ImageListView控件, 然后拖放控件到窗体上。可以通过改变视图模式定制控件的显示样式(1.略缩图 2.详细内容)
如:略缩图尺寸，列标题等等。。。 如你想将ImageListView加入到自己的控件库, 拖动源代码文件（包括用于工具栏上显示的图标)
到解决方案内。重新命名名字空间就可以了.

自定义绘制控件

ImageListViewRenderer 类负责绘制控件,他是一个有虚方法的公共类，派生类可以修改显示大小和列标题或者重绘控件的任何部分。

public class DemoRenderer : ImageListView.ImageListViewRenderer
{
   // Returns item size for the given view mode.
   public override Size MeasureItem(View view)
   {
      if (view == View.Thumbnails)
      {
         Size itemPadding = new Size(4, 4);
         Size sz = ImageListView.ThumbnailSize + ImageListView.ItemMargin +
         itemPadding + itemPadding;
         return sz;
      }
      else
      return base.MeasureItem(view);
   }
   // Draws the background of the control.
   public override void DrawBackground(Graphics g, Rectangle bounds)
   {
      if (ImageListView.View == View.Thumbnails)
      g.Clear(Color.FromArgb(32, 32, 32));
      else
      base.DrawBackground(g, bounds);
   }
   // Draws the specified item on the given graphics.
   public override void DrawItem(Graphics g,
   ImageListViewItem item, ItemState state)
   {
      if (ImageListView.View == View.Thumbnails)
      {
         Rectangle bounds = item.Bounds;
         // Black background
         using (Brush b = new SolidBrush(Color.Black))
         {
            g.FillRoundedRectangle(b, bounds, 4);
         }
         // Background of selected items
         if ((state & ItemState.Selected) == ItemState.Selected)
         {
            using (Brush b = new SolidBrush(Color.FromArgb(128,
            SystemColors.Highlight)))
            {
               g.FillRoundedRectangle(b, bounds, 4);
            }
         }
         // Gradient background
         using (Brush b = new LinearGradientBrush(
         item.Bounds,
         Color.Transparent,
         Color.FromArgb(96, SystemColors.Highlight),
         LinearGradientMode.Vertical))
         {
            g.FillRoundedRectangle(b, bounds, 4);
         }
         // Light overlay for hovered items
         if ((state & ItemState.Hovered) == ItemState.Hovered)
         {
            using (Brush b =
            new SolidBrush(Color.FromArgb(32, SystemColors.Highlight)))
            {
               g.FillRoundedRectangle(b, bounds, 4);
            }
         }
         // Border
         using (Pen p = new Pen(SystemColors.Highlight))
         {
            g.DrawRoundedRectangle(p, bounds.X, bounds.Y, bounds.Width - 1,
            bounds.Height - 1, 4);
         }
         // Image
         Image img = item.ThumbnailImage;
         if (img != null)
         {
            int x = bounds.Left + (bounds.Width - img.Width) / 2;
            int y = bounds.Top + (bounds.Height - img.Height) / 2;
            g.DrawImageUnscaled(item.ThumbnailImage, x, y);
            // Image border
            using (Pen p = new Pen(SystemColors.Highlight))
            {
               g.DrawRectangle(p, x, y, img.Width - 1, img.Height - 1);
            }
         }
      }
      else
      base.DrawItem(g, item, state);
   }
   // Draws the selection rectangle.
   public override void DrawSelectionRectangle(Graphics g, Rectangle selection)
   {
      using (Brush b = new HatchBrush(
      HatchStyle.DarkDownwardDiagonal,
      Color.FromArgb(128, Color.Black),
      Color.FromArgb(128, SystemColors.Highlight)))
      {
         g.FillRectangle(b, selection);
      }
      using (Pen p = new Pen(SystemColors.Highlight))
      {
         g.DrawRectangle(p, selection.X, selection.Y,
         selection.Width, selection.Height);
      }
   }
}

imageListView1.SetRenderer(new DemoRenderer());