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【CSharp】 Tooltip

作者:Dezai.CN / 发布于2011/5/4/ 654

<div>
C# code
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;
namespace WindowsApplication35
{
public partial class Form1 : Form
{
public class ToolTipListBox : System.Windows.Forms.ListBox
{
[StructLayout(LayoutKind.Sequential)]
public struct SIZE
{
public int cx;
public int cy;
}
[DllImport("gdi32.dll")]
public static extern int GetTextExtentPoint32(IntPtr hdc,
String str, int len, ref SIZE size);
[DllImport("user32.dll")]
public static extern IntPtr GetDC(IntPtr hWnd);
[DllImport("user32.dll")]
public static extern int ReleaseDC(IntPtr hWnd, IntPtr hdc);

public ToolTipListBox()
{
tp.InitialDelay = 500;
tp.ReshowDelay = 500;
tp.AutoPopDelay = 3000;
tp.Active = true;
}

protected override void OnMouseMove(
System.Windows.Forms.MouseEventArgs e)
{
/* Get the index of the mouse-hovered item */
int index = IndexFromPoint(e.X, e.Y);
/* Ensure that there is an item */
if (index != ListBox.NoMatches)
{
/* 
Check if the mouse has moved enough
distance for a new index 
*/
if (LastIndex != index)
{
string s = Items[index].ToString();
/* Get the text extent */
IntPtr hdc = GetDC(this.Handle);
SIZE size;
size.cx = 0;
size.cy = 0;
GetTextExtentPoint32(hdc, s, s.Length, ref size);
ReleaseDC(this.Handle, hdc);
/* If it won't fit show tool-tip */
if (this.Width < size.cx)
tp.SetToolTip(this, s);
LastIndex = index;
}
}
}
private ToolTip tp = new ToolTip();
private int LastIndex = -1;
}
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
ToolTipListBox list = new ToolTipListBox();
list.Width = 100;
list.Height = 100;
this.Controls.Add(list);
list.Items.Add("jinjazz jinjazz");
list.Items.Add("jinjazz jinjazz jinjazz jinjazz");
}
}
}
</div>

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