如何在运行时调整没有boder的表单 [英] how to resize a form without boder at runtime

问题描述

hi
我有这段代码在运行时调整表单大小：

hi I have this code to resize a form at runtime:

private const int WM_NCLBUTTONDOWN = 0xA1;
private const int HTBORDER = 18;
private const int HTBOTTOM = 15;
private const int HTBOTTOMLEFT = 16;
private const int HTBOTTOMRIGHT = 17;
private const int HTCAPTION = 2;
private const int HTLEFT = 10;
private const int HTRIGHT = 11;
private const int HTTOP = 12;
private const int HTTOPLEFT = 13;
private const int HTTOPRIGHT = 14;

[DllImport("user32.dll")]
public extern static bool ReleaseCapture();

[DllImport("user32.dll")]
public extern static bool SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

private enum ResizeDirection
{
    None,
    Left,
    TopLeft,
    Top,
    TopRight,
    Right,
    BottomRight,
    Bottom,
    BottomLeft
}

private ResizeDirection resizeDir;

private ResizeDirection ResizeDir
{
    get { return resizeDir; }
    set
    {
        resizeDir = value;

        switch (resizeDir)
        {
            case ResizeDirection.Left:
                Cursor = Cursors.SizeWE;
                break;

            case ResizeDirection.Right:
                Cursor = Cursors.SizeWE;
                break;

            case ResizeDirection.Top:
                Cursor = Cursors.SizeNS;
                break;

            case ResizeDirection.Bottom:
                Cursor = Cursors.SizeNS;
                break;

            case ResizeDirection.BottomLeft:
                Cursor = Cursors.SizeNESW;
                break;

            case ResizeDirection.TopRight:
                Cursor = Cursors.SizeNESW;
                break;

            case ResizeDirection.BottomRight:
                Cursor = Cursors.SizeNWSE;
                break;

            case ResizeDirection.TopLeft:
                Cursor = Cursors.SizeNWSE;
                break;

            default:
                Cursor = Cursors.Default;
                break;
        }
    }
}

private void ResizeForm(ResizeDirection direction)
{
    int dir = -1;

    switch (direction)
    {
        case ResizeDirection.Left:
            dir = HTLEFT;
            break;

        case ResizeDirection.TopLeft:
            dir = HTTOPLEFT;
            break;

        case ResizeDirection.Top:
            dir = HTTOP;
            break;

        case ResizeDirection.TopRight:
            dir = HTTOPRIGHT;
            break;

        case ResizeDirection.Right:
            dir = HTRIGHT;
            break;

        case ResizeDirection.BottomRight:
            dir = HTBOTTOMRIGHT;
            break;

        case ResizeDirection.Bottom:
            dir = HTBOTTOM;
            break;

        case ResizeDirection.BottomLeft:
            dir = HTBOTTOMLEFT;
            break;
    }

    if (dir != -1)
    {
        ReleaseCapture();
        SendMessage(Handle, WM_NCLBUTTONDOWN, dir, 0);
    }
}

protected override void OnMouseDown(MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left && WindowState != FormWindowState.Maximized)
        ResizeForm(ResizeDir);

    base.OnMouseDown(e);
}

private const int BorderWidth = 6;

protected override void OnMouseMove(MouseEventArgs e)
{
    if (e.Location.X < BorderWidth && e.Location.Y < BorderWidth)
        ResizeDir = ResizeDirection.TopLeft;

    else if (e.Location.X < BorderWidth && e.Location.Y > Height - BorderWidth)
        ResizeDir = ResizeDirection.BottomLeft;

    else if (e.Location.X > Width - BorderWidth && e.Location.Y > Height - BorderWidth)
        ResizeDir = ResizeDirection.BottomRight;

    else if (e.Location.X > Width - BorderWidth && e.Location.Y < BorderWidth)
        ResizeDir = ResizeDirection.TopRight;

    else if (e.Location.X < BorderWidth)
        ResizeDir = ResizeDirection.Left;

    else if (e.Location.X > Width - BorderWidth)
        ResizeDir = ResizeDirection.Right;

    else if (e.Location.Y < BorderWidth)
        ResizeDir = ResizeDirection.Top;

    else if (e.Location.Y > Height - BorderWidth)
        ResizeDir = ResizeDirection.Bottom;

    else ResizeDir = ResizeDirection.None;


    base.OnMouseMove(e);
}

代码工作正常没有问题，但我也希望在表单上显示系统菜单我也使用此代码：

the Code works fine without problems, but I also want to show the system menu on the form also I use this code:

private const int WS_CLIPCHILDREN = 0x2000000;
private const int WS_MINIMIZEBOX = 0x20000;
private const int WS_MAXIMIZEBOX = 0x10000;
private const int WS_SYSMENU = 0x80000;
private const int CS_DBLCLKS = 0x8;

protected override CreateParams CreateParams
{
    get
    {
        CreateParams cp = base.CreateParams;

        cp.Style |= WS_CLIPCHILDREN | WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_SYSMENU;
        cp.ClassStyle = CS_DBLCLKS;

        return cp;
    }
}

当我打下最后一个代码时，缩放器代码停止工作，当我更改此代码时代码：

When I lay the last code, the resizer code stops working and when I change this code:

protected override CreateParams CreateParams
{
    get
    {
        CreateParams cp = base.CreateParams;

        cp.Style |= WS_CLIPCHILDREN | WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_SYSMENU;
        cp.Style |= WS_CLIPCHILDREN | WS_MINIMIZEBOX | WS_MAXIMIZEBOX; //| WS_SYSMENU;
        cp.ClassStyle = CS_DBLCLKS;

        return cp;
    }
}

resizer代码重新开始工作，但系统菜单不再出现。

什么是解决方案

谢谢

the resizer code returns to work again, but the system menu does not longer appear.
What is the solution
Thanks

推荐答案

删除从Windows API和所有P /中获取的所有定义调用。此类基本功能基于纯.NET FCL实现，无需在应用程序级别使用任何平台调用服务。还要记住，这会大大影响应用程序的平台兼容性。



特别是 System.Windows.Forms 库允许你

调整大小并重新定位表格： https://msdn.microsoft.com/en-us/library/system.windows.forms.form.desktoplocation(v = vs.110）.aspx [ ^ ]， https://msdn.microsoft.com/en-us/library /ms159414(v=vs.110).aspx [ ^ ]， https://msdn.microsoft.com/en-us/library/25w4thew(v=vs.110).aspx [ ^ ];

捕获鼠标： https://msdn.microsoft.com/en- us / library / ms171545％28v = vs.110％29.aspx [ ^ ]，

处理调整大小事件： https://msdn.microsoft.com/en-us/library/system.windows.forms.control.resize （v = vs.110）.aspx [ ^ ]， https://msdn.microsoft.com/en-us/library/system.windows.forms.form.resizebegin（v = vs.110）的.aspx [ ^ ]， https://msdn.microsoft.com /en-us/library/system.windows.forms.form.resizeend(v=vs.110).aspx [ ^ ];

更改表单状态： https://msdn.microsoft.com /en-us/library/system.windows.forms.formwindowstate%28v=vs.110%29.aspx [ ^ ]， https://msdn.microsoft.com/en-us/ library / system.windows.forms.form.windowstate％28v = vs.110％29.aspx [ ^ ]; ...

...以及更多。



在所有代码示例中，我都可以找到.NET FCL中缺少的一个功能。如果我错过了什么，很有可能，你很容易找到它。

-SA

Remove all the definitions taken from Windows API and all P/Invoke. Such basic functionality is implemented based on pure .NET FCL, without any platform invocation services use on the application level. Also remember that this greatly compromises your application's platform compatibility.

In particular System.Windows.Forms library allows you
resize and relocate forms: https://msdn.microsoft.com/en-us/library/system.windows.forms.form.desktoplocation(v=vs.110).aspx[^], https://msdn.microsoft.com/en-us/library/ms159414(v=vs.110).aspx[^], https://msdn.microsoft.com/en-us/library/25w4thew(v=vs.110).aspx[^];
capture mouse: https://msdn.microsoft.com/en-us/library/ms171545%28v=vs.110%29.aspx[^],
handle resize events: https://msdn.microsoft.com/en-us/library/system.windows.forms.control.resize(v=vs.110).aspx[^], https://msdn.microsoft.com/en-us/library/system.windows.forms.form.resizebegin(v=vs.110).aspx[^], https://msdn.microsoft.com/en-us/library/system.windows.forms.form.resizeend(v=vs.110).aspx[^];
change form states: https://msdn.microsoft.com/en-us/library/system.windows.forms.formwindowstate%28v=vs.110%29.aspx[^], https://msdn.microsoft.com/en-us/library/system.windows.forms.form.windowstate%28v=vs.110%29.aspx[^]; …
…and a lot more.

In all of your code sample, I could find a single feature missing from .NET FCL. If I missed something, chances are, you can easily find it.

—SA

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