Windows 表单:通过部分透明的始终在顶部传递点击 window

Windows Forms: Pass clicks through a partially transparent always-on-top window

我正在设计一个 window,它始终显示在屏幕上,不透明度约为 20%。它被设计成一种状态 window,因此它始终位于顶部,但我希望人们能够通过单击 window 进入下面的任何其他应用程序。这是不透明的 window 位于此 SO post 之上,我现在正在输入:

看到那个灰色条了吗?它会阻止我此刻在标签框中输入。

您可以通过添加 WS_EX_LAYERED and WS_EX_TRANSPARENT styles to its extended styles. Also to make it always on top set its TopMost to true and to make it semi-transparent use suitable Opacity 值来制作 window,点击率:

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        this.Opacity = 0.5;
        this.TopMost = true;
    }
    [DllImport("user32.dll", SetLastError = true)]
    static extern int GetWindowLong(IntPtr hWnd, int nIndex);
    [DllImport("user32.dll")]
    static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
    const int GWL_EXSTYLE = -20;
    const int WS_EX_LAYERED = 0x80000;
    const int WS_EX_TRANSPARENT = 0x20;
    protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e);
        var style = GetWindowLong(this.Handle, GWL_EXSTYLE);
        SetWindowLong(this.Handle,GWL_EXSTYLE , style | WS_EX_LAYERED | WS_EX_TRANSPARENT);
    }
}

示例结果