Question

怎样设置窗口全透明，而鼠标不穿透

Answer 1

环境：VS2008 .net2.0 C# winform
问题：程序需要实现在主窗口上显示子窗口，子窗口上显示电压值，要求背景完全透明但文字不透明，可以拖动改变位置和大小；现在已经基本实现了该功能，就是透明的部分会有鼠标穿透效果，导致点击到透明部分时无法拖动子窗口。请问这个效果该如何修改？

C# code?

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//实现透明
label_U.BackColor = Color.White;
this.TransparencyKey = Color.White;
//移动窗口
private static void labelU_MouseDown(object sender, MouseEventArgs e)
{
FxWinApis.ReleaseCapture();
Control g = sender as Control;
if (g != null)
{
FxWinApis.SendMessage(this.Handle, FxWinApis.WM_SYSCOMMAND, FxWinApis.SC_MOVE + FxWinApis.HTCAPTION, 0);
}
}
//缩放窗口
private void FormShowVoltage_MouseDown(object sender, MouseEventArgs e)
{
this.Capture = false;
Form ff = new Form();
ff.StartPosition = FormStartPosition.Manual;
ff.Size = this.Size;
ff.Location = this.Location;

ff.SizeChanged += new EventHandler(ff_SizeChanged);
ff.LocationChanged += new EventHandler(ff_LocationChanged);

int pos = GetPostionAt(e.Location);
if (pos > 0)
{
SendMessage(ff.Handle, WM_SYSCOMMAND, SC_Size + pos, 0);//发送缩放消息
}

ff.Dispose();
}