窗口拖动功能,以及拖动时卡的解决方案

最新推荐文章于 2021-11-16 15:14:12 发布

转载最新推荐文章于 2021-11-16 15:14:12 发布 · 2.8k 阅读

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/diulela/archive/2012/06/11/2544593.html

文章标签：

#c# #python #javascript #ViewUI

本文介绍了一种在Windows窗体应用中实现无边框窗体拖动的方法，利用了 SendMessage 函数发送 WM_NCLBUTTONDOWN 消息来模拟点击标题栏拖动的行为，并对比了通过更改窗体位置实现拖动的方式。

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const int WM_NCLBUTTONDOWN = 0xA1;  
const int HT_CAPTION = 0x2;  
[DllImport("user32.dll")]  
static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);  
  
private void Form2_MouseDown(object sender, MouseEventArgs e)  
{  
    if (e.Button == MouseButtons.Left & this.WindowState == FormWindowState.Normal)  
    {  
        // 移动窗体   
        this.Capture = false;  
        SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);  
    }  
}  
const int WM_NCLBUTTONDOWN = 0xA1;
const int HT_CAPTION = 0x2;
[DllImport("user32.dll")]
static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

private void Form2_MouseDown(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left & this.WindowState == FormWindowState.Normal)
    {
        // 移动窗体
        this.Capture = false;
        SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
    }
}

实验证明这个方法是比较好的，它模拟了点击窗口标题栏进行拖动的动作

我以前用过的方法是设置窗体的Location的方法，很卡，而且快速拖动会不同步

Point m_oldpoint;  
bool m_mouse_is_down = false;  
  
private void pictureBox_title_MouseDown(object sender, MouseEventArgs e)  
{  
    m_oldpoint = MousePosition;  
}  
  
private void pictureBox_title_MouseMove(object sender, MouseEventArgs e)  
{  
    if ((e.Button != MouseButtons.Left) || (MousePosition == m_oldpoint))  
    {  
        return;  
    }  
    this.Location = new Point(this.Location.X + MousePosition.X - m_oldpoint.X, this.Location.Y + MousePosition.Y - m_oldpoint.Y);  
    m_oldpoint = MousePosition;  
}

Point m_oldpoint; bool m_mouse_is_down = false; private void pictureBox_title_MouseDown(object sender, MouseEventArgs e) { m_oldpoint = MousePosition; } private void pictureBox_title_MouseMove(object sender, MouseEventArgs e) { if ((e.Button != MouseButtons.Left) || (MousePosition == m_oldpoint)) { return; } this.Location = new Point(this.Location.X + MousePosition.X - m_oldpoint.X, this.Location.Y + MousePosition.Y - m_oldpoint.Y); m_oldpoint = MousePosition; }

转载于:https://www.cnblogs.com/diulela/archive/2012/06/11/2544593.html