窗体移动

来源：互联网发布：n合一系统优化编辑：程序博客网时间：2024/05/21 14:42

一、

窗体的OnLButtonDown函数中加入如下代码：

PostMessage(WM_NCLBUTTONDOWN,HTCAPTION,MAKELPARAM(point.x, point.y));

或

SendMessage(WM_SYSCOMMAND,0xF012,0);

二、一般思路

首先在对话框类中添加以下消息处理函数：
OnLButtonDown 左键按下
OnMouseMove 鼠标移动
OnLButtonUp 左键放开

然后在对话框类中添加两个变量用来表示是否移动窗口及按下鼠标后那个点（相对于窗口的）
BOOL m_bIsMove; //是否处于移动状态
CPoint m_CenterPt; //移动点中心

再次初始化上面的变量,在对话框类的构造函数中：
m_bIsMove = FALSE;

最后处理三个消息函数如下：
void CMoveWindowDemoDlg::OnLButtonDown(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
m_bIsMove = TRUE;
m_CenterPt = point;

CDialog::OnLButtonDown(nFlags, point);
}

void CMoveWindowDemoDlg::OnMouseMove(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
if (m_bIsMove)
{
//获取移动偏移量
int nX = point.x - m_CenterPt.x;
int nY = point.y - m_CenterPt.y;

//正在处于移动状态
CRect rect;
GetWindowRect(&rect);
rect.OffsetRect(nX,nY);
MoveWindow(rect);
}

CDialog::OnMouseMove(nFlags, point);
}

void CMoveWindowDemoDlg::OnLButtonUp(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
m_bIsMove = FALSE;

CDialog::OnLButtonUp(nFlags, point);
}

简化：

// 设对话框类变量 POINT prePoint;

// 鼠标移动函数:

void CDragMainWindowDlg::OnMouseMove(UINT nFlags, CPoint point)
{
if(nFlags == MK_LBUTTON)
{
RECT rect;
GetWindowRect(&rect);
POINT p = point;
ClientToScreen(&p);

MoveWindow(rect.left+p.x-prePoint.x,rect.top+p.y-prePoint.y,rect.right-rect.left,rect.bottom-rect.top);
prePoint = p;
}
CDialog::OnMouseMove(nFlags, point);
}

// 配合鼠标按下函数:

void CDragMainWindowDlg::OnLButtonDown(UINT nFlags, CPoint point)
{
RECT rect;
GetWindowRect(&rect);
POINT p = point;
ClientToScreen(&p);
prePoint = p;

CDialog::OnLButtonDown(nFlags, point);
}

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