如何设置 AppBar 自动隐藏 C# WinForm

Question

我知道有一种方法可以将我的应用程序桌面工具栏设置为自动隐藏，但遗憾的是我不知道如何正确使用它。你能给我举个例子吗？我正在 C# WinForm 编程 AppBar。

非常感谢

有一个代码，我用它来注册AppBar。

    [StructLayout(LayoutKind.Sequential)]
    private struct RECT
    {
        public int left;
        public int top;
        public int right;
        public int bottom;
    }

    [StructLayout(LayoutKind.Sequential)]
    private struct APPBARDATA
    {
        public int cbSize;
        public IntPtr hWnd;
        public int uCallbackMessage;
        public int uEdge;
        public RECT rc;
        public IntPtr lParam;
    }

    private enum ABMsg : int
    {
        ABM_NEW = 0,
        ABM_REMOVE,
        ABM_QUERYPOS,
        ABM_SETPOS,
        ABM_GETSTATE,
        ABM_GETTASKBARPOS,
        ABM_ACTIVATE,
        ABM_GETAUTOHIDEBAR,
        ABM_SETAUTOHIDEBAR,
        ABM_WINDOWPOSCHANGED,
        ABM_SETSTATE
    }

    private enum ABNotify : int
    {
        ABN_STATECHANGE = 0,
        ABN_POSCHANGED,
        ABN_FULLSCREENAPP,
        ABN_WINDOWARRANGE
    }

    private enum ABEdge : int
    {
        ABE_LEFT = 0,
        ABE_TOP,
        ABE_RIGHT,
        ABE_BOTTOM
    }

    private bool isBarRegistered = false;
    private int uCallBack;

    [DllImport("SHELL32", CallingConvention = CallingConvention.StdCall)]
    private static extern uint SHAppBarMessage(int dwMessage, ref APPBARDATA pData);

    [DllImport("USER32")]
    private static extern int GetSystemMetrics(int Index);

    [DllImport("User32.dll", ExactSpelling = true, CharSet = System.Runtime.InteropServices.CharSet.Auto)]
    private static extern bool MoveWindow(IntPtr hWnd, int x, int y, int cx, int cy, bool repaint);

    [DllImport("User32.dll", CharSet = CharSet.Auto)]
    private static extern int RegisterWindowMessage(string msg);

    private void RegisterBar(bool dvojty)
    {
        APPBARDATA abd = new APPBARDATA();
        abd.cbSize = Marshal.SizeOf(abd);
        abd.hWnd = this.Handle;
        if (!isBarRegistered)
        {
            if (Properties.Settings.Default.Strana.ToLower() == "ano")
            {
                this.Width = minSirka;
                this.Height = Screen.FromPoint(this.Location).WorkingArea.Height;
            }
            else
            {
                this.Width = Screen.FromPoint(this.Location).WorkingArea.Width;
                this.Height = minVyska;
            }
            uCallBack = RegisterWindowMessage("AppBarMessage");
            abd.uCallbackMessage = uCallBack;

            uint ret = SHAppBarMessage((int)ABMsg.ABM_NEW, ref abd);
            isBarRegistered = true;

            ABSetPos(hrana);
        }
        else
        {
            toolBar = new Rectangle(0, 0, 0, 0);
            SHAppBarMessage((int)ABMsg.ABM_REMOVE, ref abd);
            isBarRegistered = false;
            //this.TopMost = true;

            if (dvojty)
            {
                if (Properties.Settings.Default.Strana.ToLower() == "ano")
                {
                    this.Width = minSirka;
                    this.Height = Screen.FromPoint(this.Location).WorkingArea.Height;
                }
                else
                {
                    this.Width = Screen.FromPoint(this.Location).WorkingArea.Width;
                    this.Height = minVyska;
                }
                uCallBack = RegisterWindowMessage("AppBarMessage");
                abd.uCallbackMessage = uCallBack;

                uint ret = SHAppBarMessage((int)ABMsg.ABM_NEW, ref abd);
                isBarRegistered = true;

                ABSetPos(hrana);
            }
        }
    }

    private void ABSetPos(string edge)
    {
        APPBARDATA abd = new APPBARDATA();
        //SHAppBarMessage((int)ABMsg.ABM_SETAUTOHIDEBAR, ref abd);
        abd.cbSize = Marshal.SizeOf(abd);
        abd.hWnd = this.Handle;

        if (edge == "" || edge == "top")
        {
            abd.uEdge = (int)ABEdge.ABE_TOP;
        }
        else if (edge == "right")
        {
            abd.uEdge = (int)ABEdge.ABE_RIGHT;
        }
        else if (edge == "left")
        {
            abd.uEdge = (int)ABEdge.ABE_LEFT;
        }
        else if (edge == "bottom")
        {
            abd.uEdge = (int)ABEdge.ABE_BOTTOM;
        }
        else
        {
            abd.uEdge = (int)ABEdge.ABE_TOP;
        }

        if (abd.uEdge == (int)ABEdge.ABE_LEFT || abd.uEdge == (int)ABEdge.ABE_RIGHT)
        {
            abd.rc.top = 0;
            abd.rc.bottom = SystemInformation.PrimaryMonitorSize.Height;

            if (abd.uEdge == (int)ABEdge.ABE_LEFT)
            {
                abd.rc.left = 0;
                abd.rc.right = Size.Width;
                okraj = "left";
            }
            else
            {
                abd.rc.right = SystemInformation.PrimaryMonitorSize.Width;
                abd.rc.left = abd.rc.right - Size.Width;
                okraj = "right";
            }

        }
        else
        {
            abd.rc.left = Screen.FromControl(this).WorkingArea.Left;
            abd.rc.right = Screen.FromControl(this).WorkingArea.Right;
            if (abd.uEdge == (int)ABEdge.ABE_TOP)
            {
                abd.rc.top = Screen.FromControl(this).WorkingArea.Top;
                abd.rc.bottom = Size.Height;
                okraj = "top";  
            }
            else
            {
                abd.rc.bottom = Screen.FromControl(this).WorkingArea.Bottom;
                abd.rc.top = abd.rc.bottom - Size.Height;
                okraj = "bottom";
            }
        }

        SHAppBarMessage((int)ABMsg.ABM_QUERYPOS, ref abd);

        switch (abd.uEdge)
        {
            case (int)ABEdge.ABE_LEFT:
                abd.rc.right = abd.rc.left + Size.Width;
                break;
            case (int)ABEdge.ABE_RIGHT:
                abd.rc.left = abd.rc.right - Size.Width;
                break;
            case (int)ABEdge.ABE_TOP:
                abd.rc.bottom = abd.rc.top + Size.Height;
                break;
            case (int)ABEdge.ABE_BOTTOM:
                abd.rc.top = abd.rc.bottom - Size.Height;
                break;
        }

        this.Top -= 1;
        SHAppBarMessage((int)ABMsg.ABM_SETPOS, ref abd);
        MoveWindow(abd.hWnd, abd.rc.left, abd.rc.top, Size.Width, Size.Height, true);
        toolBar = new Rectangle(abd.rc.left, abd.rc.top, Size.Width, Size.Height);
        left = this.Left;
        top = this.Top;
    }

Answer 1

未测试

首先，您的 SHAppBarMessage() 声明应该返回 IntPtr:

[DllImport("SHELL32", CallingConvention = CallingConvention.StdCall)]
private static extern IntPtr SHAppBarMessage(int dwMessage, ref APPBARDATA pData);

然后，根据 ABM_GETAUTOHIDEBAR and ABM_SETAUTOHIDEBAR 的文档，屏幕的每个边缘只能有一个带自动隐藏功能的 AppBar。因此，在您的 ABSetPos() 方法中填写您的 APPBARDATA 结构后（指定您要使用的边缘），您可以查询系统以查看该边缘上是否已经有一个自动隐藏条。如果返回 none，那么您可以注册您的应用程序栏...类似于：

IntPtr curAutoHide = SHAppBarMessage((int)ABMsg.ABM_GETAUTOHIDEBAR, ref abd);
if (curAutoHide.Equals(IntPtr.Zero)) // if there is no current appbar with autohide set for that edge...
{
    abd.lParam = new IntPtr(1); // true
    SHAppBarMessage((int)ABMsg.ABM_SETAUTOHIDEBAR, ref abd);
}

Answer 2

经过多次不成功的尝试，我决定用不同的方式解决自动隐藏问题。如果我将 appBar 设置为自动隐藏，我会将其注册到定义的边缘，但将其大小从该边缘更改为仅 5 像素，并且其中的所有控件设置为 visible = false，并将 appBar 背景设置为黑色。从现在开始，我检查鼠标的位置，一旦鼠标移动到 appbar，appBar 将再次增长到其原始大小 - 但不会重新注册，仅编辑大小并将控件设置为可见 = true！当鼠标离开 appBar 时，设置控件可见的大小。非常简单，经过测试，既实用又无故障。

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