C# 实现可拖动的工具栏[转]

C# 实现可拖动的工具栏，可停靠浮动工具栏，也就是说，可以将工具栏拖出其原先的停靠位置，而且可以将拖出来的工具栏再拖放回去。

实现的基本思路如下：
1、拖动出来以后，需要创建一个大小合适的窗口，作为工具栏新的停靠容器，这个窗口可以这样设置：

FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow;
ShowIcon = false;
ShowInTaskbar = false;
TopMost = true;

2、浮动工具栏可以扩展自.Net Framework提供的ToolStrip，它被拖动都某个位置，松开鼠标左键时，会触发EndDarg事件，在这个事件中，我们将其从原来的停靠容器中移除，同时根据鼠标左键松开时，在鼠标所在位置上创建一个窗口，作为工具栏的新容器。

这个就是基本的思路了，下面是浮动工具栏FloatToolstrip 具体的实现代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;

namespace FloatToolStripDemo
{
    public partial class FloatToolstrip : ToolStrip
    {
        private ToolStripPanel tsPanel;

        public FloatToolstrip()
        {
            InitializeComponent();
            this.EndDrag += new EventHandler(MyToolStrip_EndDrag);
            this.SizeChanged += new EventHandler(MyToolStrip_SizeChanged);
        }

        private ToolStripFloatWindow floatForm;
        public ToolStripFloatWindow FloatForm
        {
            get { return floatForm; }
            set
            {
                floatForm = value;
                if (floatForm != null)
                {
                    floatForm.LocationChanged += new EventHandler(floatForm_LocationChanged);
                    floatForm.FormClosing += new FormClosingEventHandler(floatForm_FormClosing);
                }
            }
        }

        void floatForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            e.Cancel = true;
        }

        private void floatForm_LocationChanged(object sender, EventArgs e)
        {
            //当floatwindws的位置移动到toolstrippanel中时，将this放置到 toolstripPanel上 
            if (this.floatForm == null)
            {
                return;
            }
            else
            {
                if (floatForm.HasCreated)
                {
                    Point currentPt = new Point(floatForm.Location.X, floatForm.Location.Y);
                    Point minPt = this.tsPanel.PointToScreen(tsPanel.Location);
                    Point maxPt;
                    if (this.tsPanel.Height <= 20)
                    {
                        maxPt = new Point(minPt.X + this.tsPanel.Width, minPt.Y + 20);

                    }
                    else
                    {
                        maxPt = new Point(minPt.X + this.tsPanel.Width, minPt.Y + this.tsPanel.Height);
                    }

                    if ((currentPt.X > minPt.X) && (currentPt.X < maxPt.X) && (currentPt.Y > minPt.Y - 25) && (currentPt.Y < maxPt.Y - 25))
                    {
                        this.floatForm.Controls.Remove(this);
                        this.tsPanel.SuspendLayout();
                        this.tsPanel.Controls.Add(this);
                        this.Location = this.tsPanel.PointToClient(currentPt);
                        this.tsPanel.ResumeLayout();
                        this.floatForm.Dispose();
                        this.floatForm = null;
                    }
                }
            }
        }

        public bool isFloating
        {
            get
            {
                return (floatForm != null);
            }
        }

        public ToolStripPanel ToolStripPanel
        {
            get
            {
                return this.tsPanel;
            }
            set
            {
                this.tsPanel = value;
            }
        }

        private void MyToolStrip_EndDrag(object sender, EventArgs e)
        {
            //判断移除时
            if (this.tsPanel == null)
            {
                MessageBox.Show("请先设置ToolStripPanel属性");
                return;
            }
            Point dockPoint = Cursor.Position;
            int openX, openY;
            openX = dockPoint.X;
            openY = dockPoint.Y;

            Point clientPt = this.tsPanel.Parent.PointToClient(dockPoint);
            if (clientPt.Y > tsPanel.Height)
            {
                ToolStripFloatWindow tsfw = new ToolStripFloatWindow();
                this.tsPanel.Controls.Remove(this);
                tsfw.Controls.Add(this);
                this.Left = 0;
                this.Top = 0;
                this.FloatForm = tsfw;
                Point newLoc = new Point(openX, openY);
                tsfw.Show();
                tsfw.Location = newLoc;
                tsfw.SetBounds(newLoc.X, newLoc.Y, this.ClientSize.Width, this.ClientSize.Height+25);
            }
        }

        private void MyToolStrip_SizeChanged(object sender, EventArgs e)
        {
            if (this.isFloating)
            {
                this.floatForm.Width = this.ClientSize.Width;
            }
        }
    }
}

动态创建的作为浮动工具栏临时容器的窗口，需要加入一些处理技巧，以免发生在创建该窗口的工作尚未结束时，Dispose了这个窗口，这种情况发生在快速拖动工具栏时，触发了EndDrag事件，导致去创建临时窗口作为工具栏新的容器，而这时又将工具栏拖回原停靠容器中，会导致Dispose还没有创建完毕的临时窗口，发生异常！

下面是具体的代码：

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;

namespace FloatToolStripDemo
{
    public class ToolStripFloatWindow : Form
    {
        //解决鼠标拖动后，已经正在创建，但是触发Dispose的问题
        private bool hasCreated=false;
        public bool HasCreated
        {
            get
            {
                return hasCreated;
            }
        }

        public ToolStripFloatWindow():base()
        {
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow;
            this.Name = "ToolStripFloatWindow";
            this.ShowIcon = false;
            this.ShowInTaskbar = false;
            this.TopMost = true;
            this.Load += new System.EventHandler(this.ToolStripFloatWindow_Load);
        }

        private void ToolStripFloatWindow_Load(object sender, EventArgs e)
        {
            this.hasCreated = true;
        }
    }
}