16

我正在尝试制作从工具栏弹出的无边框表单。我希望用户能够抓住右下角（“调整大小手柄”）并能够调整表单大小，但不能以任何其他方式调整表单大小或重新定位表单。

我听说我可以拦截WM_NCHITTEST发送到表单的消息并将其结果设置为HTBOTTOMRIGHT让操作系统处理表单的大小调整，就好像它有一个相当大的框架一样。我的想法是检测鼠标指针是否进入了我在角落定义的框，如果进入则返回HTBOTTOMRIGHT结果。

说明调整大小手柄的图形

这并不像我预期的那样工作。我能够截获该消息，但似乎只有当用户将鼠标光标放在表单的 1px 粗边框上时才会发送该消息。这意味着它可以按照我的意愿工作，如果您将光标非常精确地定位在右下角边缘。

这是我的WndProc覆盖：

protected override void WndProc(ref Message m)
{
    const UInt32 WM_NCHITTEST = 0x0084;
    const UInt32 HTBOTTOMRIGHT = 17;
    const int RESIZE_HANDLE_SIZE = 40;
    bool handled = false;
    if (m.Msg == WM_NCHITTEST)
    {
        Size formSize = this.Size;
        Point screenPoint = new Point(m.LParam.ToInt32());
        Point clientPoint = this.PointToClient(screenPoint);
        Rectangle hitBox = new Rectangle(formSize.Width - RESIZE_HANDLE_SIZE, formSize.Height - RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE);
        if (hitBox.Contains(clientPoint))
        {
            m.Result = (IntPtr)HTBOTTOMRIGHT;
            handled = true;
        }
    }

    if (!handled)
        base.WndProc(ref m);
}

我做错了什么还是有更好的方法来做我想做的事情？

非常感谢。

4

4 回答 4

21

我正在寻找类似的东西，而 Anton 的代码是一个很好的基础。这就是我最终从各个方面调整大小的工作。我不确定Dictionary存储碰撞箱的最佳方式是什么，但我想这并不重要。

而且由于我的表单使用 Fill as Dock 参数填充了控件，因此我只需要添加一个 5px 的填充就Form可以很好地工作。

protected override void WndProc(ref Message m)
{
    const UInt32 WM_NCHITTEST = 0x0084;
    const UInt32 WM_MOUSEMOVE = 0x0200;

    const UInt32 HTLEFT = 10;
    const UInt32 HTRIGHT = 11;
    const UInt32 HTBOTTOMRIGHT = 17;
    const UInt32 HTBOTTOM = 15;
    const UInt32 HTBOTTOMLEFT = 16;
    const UInt32 HTTOP = 12;
    const UInt32 HTTOPLEFT = 13;
    const UInt32 HTTOPRIGHT = 14;

    const int RESIZE_HANDLE_SIZE = 10;
    bool handled = false;
    if (m.Msg == WM_NCHITTEST || m.Msg == WM_MOUSEMOVE)
    {
        Size formSize = this.Size;
        Point screenPoint = new Point(m.LParam.ToInt32());
        Point clientPoint = this.PointToClient(screenPoint);

        Dictionary<UInt32, Rectangle> boxes = new Dictionary<UInt32, Rectangle>() {
            {HTBOTTOMLEFT, new Rectangle(0, formSize.Height - RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE)},
            {HTBOTTOM, new Rectangle(RESIZE_HANDLE_SIZE, formSize.Height - RESIZE_HANDLE_SIZE, formSize.Width - 2*RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE)},
            {HTBOTTOMRIGHT, new Rectangle(formSize.Width - RESIZE_HANDLE_SIZE, formSize.Height - RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE)},
            {HTRIGHT, new Rectangle(formSize.Width - RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE, formSize.Height - 2*RESIZE_HANDLE_SIZE)},
            {HTTOPRIGHT, new Rectangle(formSize.Width - RESIZE_HANDLE_SIZE, 0, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE) },
            {HTTOP, new Rectangle(RESIZE_HANDLE_SIZE, 0, formSize.Width - 2*RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE) },
            {HTTOPLEFT, new Rectangle(0, 0, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE) },
            {HTLEFT, new Rectangle(0, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE, formSize.Height - 2*RESIZE_HANDLE_SIZE) }
        };

        foreach (KeyValuePair<UInt32, Rectangle> hitBox in boxes)
        {
            if (hitBox.Value.Contains(clientPoint))
            {
                m.Result = (IntPtr) hitBox.Key;
                handled = true;
                break;
            }
        }
    }

    if (!handled)
        base.WndProc(ref m);
}
于 2013-10-29T22:33:11.687 回答
3

基于 Charles P. 解决方案对其进行了一些修改，希望它也对其他人有所帮助:) 每次调用 windows 消息时不声明额外变量的小检查和改进。还检查当窗口状态最大化时不绘制夹点锚。我想用它创建一个自定义控件，但不幸的是，我最终用这段代码填写了表单。

构造函数或在设计器文件中：

this.DoubleBuffered = true;
this.ResizeRedraw   = true;

覆盖windows函数：

    const uint WM_NCHITTEST = 0x0084, WM_MOUSEMOVE = 0x0200,
                 HTLEFT = 10, HTRIGHT = 11, HTBOTTOMRIGHT = 17,
                 HTBOTTOM = 15, HTBOTTOMLEFT = 16, HTTOP = 12,
                 HTTOPLEFT = 13, HTTOPRIGHT = 14;
    Size formSize;
    Point screenPoint;
    Point clientPoint;
    Dictionary<uint, Rectangle> boxes;
    const int RHS = 10; // RESIZE_HANDLE_SIZE
    bool handled;

    protected override void WndProc(ref Message m)
    {
        if (this.WindowState == FormWindowState.Maximized)
        {
            base.WndProc(ref m);
            return;
        }

        handled  = false;
        if (m.Msg == WM_NCHITTEST || m.Msg == WM_MOUSEMOVE)
        {
            formSize    = this.Size;
            screenPoint = new Point(m.LParam.ToInt32());
            clientPoint = this.PointToClient(screenPoint);

            boxes = new Dictionary<uint, Rectangle>() {
                {HTBOTTOMLEFT, new Rectangle(0, formSize.Height - RHS, RHS, RHS)},
                {HTBOTTOM, new Rectangle(RHS, formSize.Height - RHS, formSize.Width - 2*RHS, RHS)},
                {HTBOTTOMRIGHT, new Rectangle(formSize.Width - RHS, formSize.Height - RHS, RHS, RHS)},
                {HTRIGHT, new Rectangle(formSize.Width - RHS, RHS, RHS, formSize.Height - 2*RHS)},
                {HTTOPRIGHT, new Rectangle(formSize.Width - RHS, 0, RHS, RHS) },
                {HTTOP, new Rectangle(RHS, 0, formSize.Width - 2*RHS, RHS) },
                {HTTOPLEFT, new Rectangle(0, 0, RHS, RHS) },
                {HTLEFT, new Rectangle(0, RHS, RHS, formSize.Height - 2*RHS) }
            };

            foreach (var hitBox in boxes)
            {
                if (hitBox.Value.Contains(clientPoint))
                {
                    m.Result = (IntPtr)hitBox.Key;
                    handled  = true;
                    break;
                }
            }
        }

        if (!handled)
            base.WndProc(ref m);
    }


    protected override void OnPaint(PaintEventArgs e)
    {
        if (this.WindowState != FormWindowState.Maximized)
        {
            ControlPaint.DrawSizeGrip(e.Graphics, this.BackColor,
                this.ClientSize.Width - 16, this.ClientSize.Height - 16, 16, 16);
        }

        base.OnPaint(e);
    }
于 2017-04-14T13:12:17.700 回答
2

just little modification to your code. I've added WM_MOUSEMOVE message handling:

    protected override void WndProc(ref Message m)
    {
        const UInt32 WM_NCHITTEST = 0x0084;
        const UInt32 WM_MOUSEMOVE = 0x0200;
        const UInt32 HTBOTTOMRIGHT = 17;
        const int RESIZE_HANDLE_SIZE = 10;
        bool handled = false;
        if (m.Msg == WM_NCHITTEST || m.Msg == WM_MOUSEMOVE )
        {
            Size formSize = this.Size;
            Point screenPoint = new Point(m.LParam.ToInt32());
            Point clientPoint = this.PointToClient(screenPoint);
            Rectangle hitBox = new Rectangle(formSize.Width - RESIZE_HANDLE_SIZE, formSize.Height - RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE);
            if (hitBox.Contains(clientPoint))
            {
                m.Result = (IntPtr)HTBOTTOMRIGHT;
                handled = true;
            }
        }

        if (!handled)
            base.WndProc(ref m);
    }

by the way, you can draw system specific window size grip with ControlPaint.DrawSizeGrip Method http://msdn.microsoft.com/en-us/library/2e1yx2sa.aspx

于 2013-07-19T19:07:53.253 回答
2

Anton Semenov，我不明白你的代码。

无论如何，当我最大化窗口然后尝试更改其大小时，我对 Charles P 的第一个代码有问题- 它正在调整大小。 之后我无法再次将其修复为正常大小，也无法使用正常的最大按钮再次最大化它。

我为解决这个问题所做的就是在底部的“foreach”循环中添加条件：

    protected override void WndProc(ref Message m)
    {
        const UInt32 WM_NCHITTEST = 0x0084;
        const UInt32 WM_MOUSEMOVE = 0x0200;

        const UInt32 HTLEFT = 10;
        const UInt32 HTRIGHT = 11;
        const UInt32 HTBOTTOMRIGHT = 17;
        const UInt32 HTBOTTOM = 15;
        const UInt32 HTBOTTOMLEFT = 16;
        const UInt32 HTTOP = 12;
        const UInt32 HTTOPLEFT = 13;
        const UInt32 HTTOPRIGHT = 14;

        const int RESIZE_HANDLE_SIZE = 10;
        bool handled = false;
        if (m.Msg == WM_NCHITTEST || m.Msg == WM_MOUSEMOVE)
        {
            Size formSize = this.Size;
            Point screenPoint = new Point(m.LParam.ToInt32());
            Point clientPoint = this.PointToClient(screenPoint);

            Dictionary<UInt32, Rectangle> boxes = new Dictionary<UInt32, Rectangle>() {
        {HTBOTTOMLEFT, new Rectangle(0, formSize.Height - RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE)},
        {HTBOTTOM, new Rectangle(RESIZE_HANDLE_SIZE, formSize.Height - RESIZE_HANDLE_SIZE, formSize.Width - 2*RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE)},
        {HTBOTTOMRIGHT, new Rectangle(formSize.Width - RESIZE_HANDLE_SIZE, formSize.Height - RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE)},
        {HTRIGHT, new Rectangle(formSize.Width - RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE, formSize.Height - 2*RESIZE_HANDLE_SIZE)},
        {HTTOPRIGHT, new Rectangle(formSize.Width - RESIZE_HANDLE_SIZE, 0, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE) },
        {HTTOP, new Rectangle(RESIZE_HANDLE_SIZE, 0, formSize.Width - 2*RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE) },
        {HTTOPLEFT, new Rectangle(0, 0, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE) },
        {HTLEFT, new Rectangle(0, RESIZE_HANDLE_SIZE, RESIZE_HANDLE_SIZE, formSize.Height - 2*RESIZE_HANDLE_SIZE) }
            };

            foreach (KeyValuePair<UInt32, Rectangle> hitBox in boxes)
            {
                if (this.WindowState != FormWindowState.Maximized 
                    && hitBox.Value.Contains(clientPoint))
                    {
                        m.Result = (IntPtr)hitBox.Key;
                        handled = true;
                        break;
                    }
            }
        }

        if (!handled)
            base.WndProc(ref m);
    }
于 2014-07-08T07:23:58.457 回答