更改窗口标题中的光标 [英] Change cursor in window caption

问题描述

我有一个WinForm，现在当它在Windows标题部分中时，我需要更改光标.我有一些代码在工作，它有2个问题:

I have a WinForm and now I need to change the cursor when it's in the windows caption part. I have some code working, it has 2 problems:

1. <罢工> 当位于边缘时，它也会更改光标(应该显示正常的调整大小光标). 我发现我需要这样的WM_NCHITTEST& HTTOP，但是我该如何结合呢?
2. 移动鼠标时会有一些闪烁.

1. It also changes the cursor when on the edges (normal resize cursor should be shown). I found out the I need something like this WM_NCHITTEST & HTTOP, but how do I combine that?
2. There's some flicker when moving the mouse.

我还尝试将代码放置在base.WndProc(ref m);下面.

I also tried placing the code below the base.WndProc(ref m);.

这是我已经拥有的代码:

This is the code I already have:

if ((m.Msg == Win32.WM.NCMOUSEMOVE
    || m.Msg == Win32.WM.NCLBUTTONDOWN || m.Msg == Win32.WM.NCLBUTTONUP
    || m.Msg == Win32.WM.NCRBUTTONDOWN || m.Msg == Win32.WM.NCRBUTTONUP)
)
{
    if (m.WParam.ToInt32() != Win32.HT.TOP && m.WParam.ToInt32() != Win32.HT.RIGHT && m.WParam.ToInt32() != Win32.HT.BOTTOM && m.WParam.ToInt32() != Win32.HT.LEFT)
    {
        Cursor = Cursors.Hand;
    }
}

我没有在Spy ++中正确记录消息.找到了窗口边缘的解决方案(请参阅更新的代码).

I wasn't logging the message correctly in Spy++. Found the solution to the window edges (see updated code).

Thnx，J

推荐答案

它闪烁，因为您使用了错误的消息. WM_SETCURSOR跟随鼠标的任何移动，以允许应用更改光标.因此，光标会变回默认值.改为拦截WM_SETCURSOR. LParam的低位字包含点击测试代码.

It flickers because you use the wrong message. Any mouse move is followed by WM_SETCURSOR to allow the app to change the cursor. So the cursor changes back to the default. Intercept WM_SETCURSOR instead. The low word of LParam contains the hit test code.

    protected override void WndProc(ref Message m) {
        if (m.Msg == 0x20) {  // Trap WM_SETCUROR
            if ((m.LParam.ToInt32() & 0xffff) == 2) { // Trap HTCAPTION
                Cursor.Current = Cursors.Hand;
                m.Result = (IntPtr)1;  // Processed
                return;
            }
        }
        base.WndProc(ref m);
    }

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