winforms 如何正确对齐标签到文本框，如果DPI是变化的？

krugob8w 于 2023-03-31 发布在其他

关注(0)|答案(1)|浏览(118)

我已经在配置文件中启用了这些建议的设置：

<add key="DpiAware" value="true" />
<add key="DpiAwareness" value="PerMonitorV2" />
<add key="EnableWindowsFormsHighDpiAutoResizing" value="true" />

在main函数中：

Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);

所有内容都在顶部和左侧锚定，这是它在100%缩放显示屏上的外观：

当我将窗口移动到150或175%缩放显示时：

如您所见，标签向下偏移了几个像素。
容器的AutoScaleMode设置为DPI。
如何保持对齐？

winforms

来源：https://stackoverflow.com/questions/75146918/how-to-properly-align-label-to-text-box-if-dpi-is-changing

1条答案

按热度按时间

plupiseo1#

我遇到了同样的问题，经过一些挖掘，我带着这个控件来了，它可以代替标签使用。已知问题：单击时，获得焦点的控件将失去焦点。这既可以在TableLayoutPanel中使用，也可以单独使用。

public class LabelTextBox : System.Windows.Forms.TextBox
{
    private const int WM_NCPAINT = 0x85;
    private const int WM_SETFOCUS = 0x07;
    private const int WM_ENABLE = 0x0A;
    private const int WM_SETCURSOR = 0x20;

    [StructLayout(LayoutKind.Sequential)]
    private struct RECT
    {
        // https://www.pinvoke.net/default.aspx/Structures/RECT.html
    }

    [StructLayout(LayoutKind.Sequential)]
    private struct POINT
    {
        // https://www.pinvoke.net/default.aspx/Structures/POINT.html
    }

    public LabelTextBox()
    {
        // Disable some TextBox interactions, so it is intact as the Label
        this.ReadOnly = true;
        this.TabStop = false;
    }

    [DllImport("user32")]
    private static extern IntPtr GetWindowDC(IntPtr hwnd);
    
    [DllImport("user32")]
    private static extern bool GetClientRect(IntPtr hwnd, out RECT rectangle);
    
    [DllImport("user32")]
    private static extern bool GetWindowRect(IntPtr hwnd, out RECT rectangle);

    [DllImport("user32.dll")]
    static extern bool ClientToScreen(IntPtr hWnd, ref POINT lpPoint);

    protected override void WndProc(ref Message m)
    {
        // Disable some TextBox interactions, so it is intact as the Label
        if (m.Msg == WM_SETFOCUS || m.Msg == WM_ENABLE || m.Msg == WM_SETCURSOR)
            return;

        // When the boreder should be painted
        if (m.Msg == WM_NCPAINT)
        {
            // Get the rect of the client area in the sceen coordinates.
            var clientOrigin = new POINT(0, 0);
            ClientToScreen(Handle, ref clientOrigin);
            GetClientRect(Handle, out var clientRect);
            clientRect.X = clientOrigin.X;
            clientRect.Y = clientOrigin.Y;

            // Get the rect of the window area in the sceen coordinates.
            GetWindowRect(Handle, out var windowRect);

            // Calculate the rect of the client area in the window coordinates.
            // This will be our clipping area, because we want to paint only the border.
            var clip = new Rectangle(
                clientRect.Left - windowRect.Left,
                clientRect.Top - windowRect.Top,
                clientRect.Width,
                clientRect.Height
                );

            // Get the Graphics, set the clip and fill with the BackColor.
            var dc = GetWindowDC(Handle);
            using (Graphics g = Graphics.FromHdc(dc))
            {
                g.SetClip(clip, CombineMode.Exclude);
                g.FillRectangle(new SolidBrush(BackColor), 0, 0, windowRect.Width, windowRect.Height);
            }
            
            return;
        }

        base.WndProc(ref m);
    }
}

结果是：
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