Question

我想锁定它的左坐标。

这并不是我想要的，因为有毛刺 - 闪烁，因为窗口被移回到Left = 0。我对像LocationChanging这样的东西更感兴趣，以防止它向左或向右移动。

private void Window_LocationChanged(object sender, EventArgs e)
        {
            if (Left != 0) Left = 0;
        }

Answer 1

一个选项是捕获WM_MOVING窗口消息并操纵其lParam。由于WM_MOVING在窗口移动之前到来，您可以根据需要调整下一个位置。

using System;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;

public partial class MainWindow : Window
{
    private const int WM_MOVING = 0x0216;

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

    private int _left;
    private int _width;

    public MainWindow()
    {
        InitializeComponent();
        this.Loaded += OnLoaded;
    }

    private void OnLoaded(object sender, RoutedEventArgs e)
    {
        _left = (int)this.Left;
        _width = (int)this.Width;

        var handle = new WindowInteropHelper(this).Handle;
        var source = HwndSource.FromHwnd(handle);
        source.AddHook(new HwndSourceHook(WndProc));
    }

    private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
    {
        if (msg == WM_MOVING)
        {
            var position = Marshal.PtrToStructure<RECT>(lParam);
            position.left = _left;
            position.right = position.left + _width;
            Marshal.StructureToPtr(position, lParam, true);
        }
        return IntPtr.Zero;
    }
}

wpf - 允许窗口仅上下移动

1 个答案: