.NET：有没有点击和拖动＆QUOT;台式机一样的＆QUOT;控制？ [英] .NET: is there a Click-and-drag "Desktop-Like" control?

问题描述

确定，首先为背景看Windows桌面;你可以把桌面上的项目（文件夹，文件），并拖动他们到不同的地方，他们留在那里你拖动它们。这似乎是一个pretty的有用的功能，为用户提供，以便让他们创建的项目属于自己的分组。

OK, first for context look at the Windows desktop; You can take items (folders, files) on the desktop and drag them around to different places and they "stay" where you dragged them. This seems to be a pretty useful feature to offer users so as to allow them to create their own "groupings" of items.

我的问题就是如此： 是否有近似于物品的集合？

My question is thus: Is there a control in .NET that approximates this behavior with a collection of items?

我想是这样的LargeIcon模式下的列表视图，但它可以让你拖动图标到控制内部不同的地方。

I'm thinking something like a listview in "LargeIcon" mode, but it allows you to drag the icons around to different places inside the control.

推荐答案

您可以通过实施拖和下降一个标准的ListView控件做到这一点。下面是一个示例的控制，做这样的：

You can do this with a standard ListView control by implementing drag-and-drop. Here's a sample control that does this:

using System;
using System.Drawing;
using System.Windows.Forms;

public class MyListView : ListView {
  private Point mItemStartPos;
  private Point mMouseStartPos;

  public MyListView() {
    this.AllowDrop = true;
    this.View = View.LargeIcon;
    this.AutoArrange = false;
    this.DoubleBuffered = true;
  }

  protected override void OnDragEnter(DragEventArgs e) {
    if (e.Data.GetData(typeof(ListViewItem)) != null) e.Effect = DragDropEffects.Move;
  }
  protected override void OnItemDrag(ItemDragEventArgs e) {
    // Start dragging
    ListViewItem item = e.Item as ListViewItem;
    mItemStartPos = item.Position;
    mMouseStartPos = Control.MousePosition;
    this.DoDragDrop(item, DragDropEffects.Move);
  }
  protected override void OnDragOver(DragEventArgs e) {
    // Move icon
    ListViewItem item = e.Data.GetData(typeof(ListViewItem)) as ListViewItem;
    if (item != null) {
      Point mousePos = Control.MousePosition;
      item.Position = new Point(mItemStartPos.X + mousePos.X - mMouseStartPos.X,
          mItemStartPos.Y + mousePos.Y - mMouseStartPos.Y);
    }
  }
}

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