Question

像标题一样，我希望WPF在2台显示器上最大化（现在我的电脑上有2台显示器）。我设置

this.state = {
  imageURL: []
};

fileSelectHandler = (event) => {
  this.setState({
    imageURL: [???]
  });
}

<input type="file" multiple onChange={fileSelectHandler} />
<img src={imageURL[0]} />

但不完整，间距与图像相同。我希望用户单击最大化按钮，然后窗口最大化2个监视器。有人知道吗？谢谢大家！

p / s：对不起，我的英语不好。

Answer 1

您需要找到点Left，Top，Height，Width，并将其直接设置为要最大化的窗口

MonitorFromPoint
MonitorFromRect
MonitorFromWindow

为完整起见，我首先介绍如何在指定的监视器上最大化窗口的简单方法。

void Maximize(HWND hWnd, HMONITOR hMonitor)
{
    // access monitor info
    MONITORINFO monitorInfo = { sizeof(MONITORINFO) };
    GetMonitorInfo(hMonitor, &monitorInfo);

    // restore window to normal size if it is not yet
    ShowWindow(hWnd, SW_RESTORE);

    // move window to the monitor
    SetWindowPos(hWnd, nullptr, monitorInfo.rcMonitor.left, 
    monitorInfo.rcMonitor.top, 0, 0, SWP_NOZORDER | SWP_NOSIZE);

    // maximize window
    ShowWindow(hWnd, SW_MAXIMIZE);    
}

如果使用相同的输入窗口和相同的目标监视器多次调用函数，则闪烁会更加明显。当然，有人可能会争辩说有可能获得窗口的当前状态并避免调用该函数（或者，如果检测到该状态已经正确，则可以在函数中提前返回）。但是，这样的处理只会增加功能的复杂性。我在想是否不能仅隐藏窗口并以某种方式在后台执行状态恢复，而仅在最后显示窗口。但是尝试注入一些SetRender（hWnd，FALSE）或ShowWindow（SW_HIDE）调用只会使输出更糟。经过一些测试，我发现更改最大化/普通窗口仅改变了窗口样式中的一位（WS_MAXIMIZE），最后有了这些信息，我得到了最终的好解决方案：

void Maximize(HWND hWnd, HMONITOR hMonitor)
{
    // access monitor info
    MONITORINFO monitorInfo = { sizeof(MONITORINFO) };
    GetMonitorInfo(hMonitor, &monitorInfo);

    const LONG currStyles = GetWindowLong(hWnd, GWL_STYLE);
    SetWindowLong(hWnd, GWL_STYLE, currStyles | WS_MAXIMIZE);
    const auto rc = monitorInfo.rcMonitor;
    SetWindowPos(&CWnd::wndTop, rc.left, rc.top, rc.Width(), rc.Height(), 0);
}

就是这样。该函数按预期工作，即使被多次调用，也不会闪烁。通过从窗口样式中删除WS_MAXIMIZE并使用正确的矩形信息调用SetWindowPos，可以轻松更改该函数以将窗口恢复为正常大小。

        [DllImport("User32.dll")]
        private static extern IntPtr MonitorFromPoint([In]System.Drawing.Point pt, [In]uint dwFlags);

        //https://msdn.microsoft.com/en-us/library/windows/desktop/dn280510(v=vs.85).aspx
        [DllImport("Shcore.dll")]
        private static extern IntPtr GetDpiForMonitor([In]IntPtr hmonitor, [In]DpiType dpiType, [Out]out uint dpiX, [Out]out uint dpiY);

        public enum DpiType
        {
            Effective = 0,
            Angular = 1,
            Raw = 2,
        }

        /// <summary>
        /// POINT aka POINTAPI
        /// </summary>
        [StructLayout(LayoutKind.Sequential)]
        public struct POINT
        {
            /// <summary>
            /// x coordinate of point.
            /// </summary>
            public int x;
            /// <summary>
            /// y coordinate of point.
            /// </summary>
            public int y;

            /// <summary>
            /// Construct a point of coordinates (x,y).
            /// </summary>
            public POINT(int x, int y)
            {
                this.x = x;
                this.y = y;
            }
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct MINMAXINFO
        {
            public POINT ptReserved;
            public POINT ptMaxSize;
            public POINT ptMaxPosition;
            public POINT ptMinTrackSize;
            public POINT ptMaxTrackSize;
        };

        /// <summary>
        /// </summary>
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
        public class MONITORINFO
        {
            /// <summary>
            /// </summary>            
            public int cbSize = Marshal.SizeOf(typeof(MONITORINFO));

            /// <summary>
            /// </summary>            
            public RECT rcMonitor = new RECT();

            /// <summary>
            /// </summary>            
            public RECT rcWork = new RECT();

            /// <summary>
            /// </summary>            
            public int dwFlags = 0;
        }


        /// <summary> Win32 </summary>
        [StructLayout(LayoutKind.Sequential, Pack = 0)]
        public struct RECT
        {
            /// <summary> Win32 </summary>
            public int left;
            /// <summary> Win32 </summary>
            public int top;
            /// <summary> Win32 </summary>
            public int right;
            /// <summary> Win32 </summary>
            public int bottom;

            /// <summary> Win32 </summary>
            public static readonly RECT Empty = new RECT();

            /// <summary> Win32 </summary>
            public int Width
            {
                get { return Math.Abs(right - left); }  // Abs needed for BIDI OS
            }
            /// <summary> Win32 </summary>
            public int Height
            {
                get { return bottom - top; }
            }

            /// <summary> Win32 </summary>
            public RECT(int left, int top, int right, int bottom)
            {
                this.left = left;
                this.top = top;
                this.right = right;
                this.bottom = bottom;
            }


            /// <summary> Win32 </summary>
            public RECT(RECT rcSrc)
            {
                this.left = rcSrc.left;
                this.top = rcSrc.top;
                this.right = rcSrc.right;
                this.bottom = rcSrc.bottom;
            }

            /// <summary> Win32 </summary>
            public bool IsEmpty
            {
                get
                {
                    // BUGBUG : On Bidi OS (hebrew arabic) left > right
                    return left >= right || top >= bottom;
                }
            }
            /// <summary> Return a user friendly representation of this struct </summary>
            public override string ToString()
            {
                if (this == RECT.Empty) { return "RECT {Empty}"; }
                return "RECT { left : " + left + " / top : " + top + " / right : " + right + " / bottom : " + bottom + " }";
            }

            /// <summary> Determine if 2 RECT are equal (deep compare) </summary>
            public override bool Equals(object obj)
            {
                if (!(obj is Rect)) { return false; }
                return (this == (RECT)obj);
            }

            /// <summary>Return the HashCode for this struct (not garanteed to be unique)</summary>
            public override int GetHashCode()
            {
                return left.GetHashCode() + top.GetHashCode() + right.GetHashCode() + bottom.GetHashCode();
            }


            /// <summary> Determine if 2 RECT are equal (deep compare)</summary>
            public static bool operator ==(RECT rect1, RECT rect2)
            {
                return (rect1.left == rect2.left && rect1.top == rect2.top && rect1.right == rect2.right && rect1.bottom == rect2.bottom);
            }

            /// <summary> Determine if 2 RECT are different(deep compare)</summary>
            public static bool operator !=(RECT rect1, RECT rect2)
            {
                return !(rect1 == rect2);
            }


        }

        [DllImport("user32")]
        internal static extern bool GetMonitorInfo(IntPtr hMonitor, MONITORINFO lpmi);

         [DllImport("User32")]
    internal static extern IntPtr MonitorFromWindow(IntPtr handle, int flags);

链接：- http://msdn.microsoft.com/en-us/library/windows/desktop/dd145071%28v=vs.85%29.aspx http://blogs.msdn.com/b/oldnewthing/archive/2010/04/12/9994016.aspx

Answer 2

我希望用户单击最大化按钮，然后窗口最大化2个监视器。

当用户单击最大化按钮时，将其放置。

if (System.Windows.Forms.Screen.AllScreens.Length > 1)
{
    System.Drawing.Rectangle entireSize = System.Drawing.Rectangle.Empty;

    foreach (System.Windows.Forms.Screen s in System.Windows.Forms.Screen.AllScreens)
        entireSize = System.Drawing.Rectangle.Union(entireSize, s.Bounds);

    //this.WindowState = NORMAL // SET Window State to Normal.


    this.Width = entireSize.Width;
    this.Height = entireSize.Height;

    this.Left = entireSize.Left;
    this.Top = entireSize.Top;

}

最大化2个监视器上的WPF窗口

2 个答案: