QQ窗体上滑的效果，主要通过处理鼠标消息实现的。
有三种消息需要处理：
左键弹起：判断窗体的上边，是否在屏幕上边线以上，是则调整窗体的Y坐标为0.
鼠标移出窗体：判断窗体左上角Y坐标是否为0
鼠标进入窗体：判断窗体是否已经上滑，如果已经上滑，需要还原窗体。
移动窗体的时候，计算出Y轴上需要移动的距离，然后分成10次移动，每次间隔50ms，以达到连续移动的效果。
代码如下：
类QQ窗体
using System;
using System.Drawing;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace FormHideLikeQQ
{
public partial class QQForm : Form
{
public QQForm()
{
InitializeComponent();
}
///
/// 鼠标弹起时，如果上边缘超过上顶端线。将其移动到顶端线上
///
///
///
private void QQForm_MouseUp()
{
if (this.Location.Y < 0)
{
MoveForm(new Point(this.Location.X, 0));
}
}
///
/// 如果上边缘在上顶端线上，鼠标离开则上滑窗体
///
///
///
private void QQForm_MouseLeave()
{
if (this.Location.Y == 0)
{
MoveForm(new Point(this.Location.X, 5 - this.Size.Height));
}
}
///
/// 窗体移动函数，有缓慢移动特效。
///
///
private void MoveForm(Point newPos)
{
//500ms内移动完
Point currentPos = this.Location;
double step = (newPos.Y - this.Location.Y) / 10.0;
for (int i = 1; i <= 10; i++)
{
this.Location = new Point(this.Location.X, (int)(currentPos.Y + step * i));
System.Threading.Thread.Sleep(50);
}
}
///
/// 鼠标进入窗体的响应事件
///
private void QQForm_MouseEnter()
{
if (this.Location.Y == (5 - this.Size.Height))
{
MoveForm(new Point(this.Location.X, 0));
}
}
[DllImport("user32")]
public static extern bool TrackMouseEvent(TRACKMOUSEEVENT lpEventTrack);
[StructLayout( LayoutKind.Sequential,CharSet=CharSet.Ansi)]
public struct TRACKMOUSEEVENT {
public long cbSize;
public long dwFlags;
public long hwndTrack;
public long dwHoverTime;
}
private const int WM_MOUSEHOVER = 0x2a1;
private const int WM_MOUSELEAVE = 0x2a3;
private const int WM_MOUSEMOVE = 0x200;
private const int TME_HOVER = 0x1;
private const int WM_LBUTTONUP = 0x202;
private const int WM_LBUTTONDOWN = 0x201;
private const int VK_LBUTTON = 0x01;
///
/// 消息处理函数
///
///
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
switch (m.Msg)
{
case WM_LBUTTONDOWN:
{
if (m.WParam.ToInt32() == VK_LBUTTON)
{
this._mouseDownPos = GetPointFromLPARAM(m.LParam.ToInt32());
}
}
break;
case WM_LBUTTONUP:
QQForm_MouseUp();
break;
case WM_MOUSELEAVE:
QQForm_MouseLeave();
break;
case WM_MOUSEHOVER:
QQForm_MouseEnter();
break;
case WM_MOUSEMOVE:
{
TRACKMOUSEEVENT msevnt = new TRACKMOUSEEVENT();