Notification Window - Preventing the window from ever getting focus
我在让通知框在 c# 中正常运行时遇到了一些问题。基本上，我在屏幕的右下角显示了一个无边界表格，它会显示一条消息几秒钟然后消失。问题是我需要它出现在其他窗口的顶部，而它却无法窃取焦点。理想情况下，我希望它是纯托管代码，尽管查看类似示例我怀疑这是否可能。
目前我正在阻止它在调用 Form.Show() 时窃取焦点：
1 2 3 4 | protected override bool ShowWithoutActivation // stops the window from stealing focus { get { return true; } } |
然后忽略鼠标点击：
1 2 3 4 5 6 7 8 9 10 11 12 | private const int WM_MOUSEACTIVATE = 0x0021; private const int MA_NOACTIVATEANDEAT = 0x0004; protected override void WndProc(ref Message m) { if (m.Msg == WM_MOUSEACTIVATE) { m.Result = (IntPtr)MA_NOACTIVATEANDEAT; return; } base.WndProc(ref m); } |
但是我发现如果我将它们与 TopMost = true (我需要)结合使用，它无论如何都会获得焦点，如果所有其他窗口都被最小化，它也会获得焦点。
那么，有没有什么方法可以完全阻止表单获得焦点(无论是通过鼠标单击、alt-tab 等)，同时仍然是最顶部/第二顶部的表单？即使只是将焦点立即返回到它从中窃取的窗口也可以工作(尽管会引入闪烁)。
任何建议将不胜感激，我真的坚持这一点。
编辑：
好的，所以我终于设法使用：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | protected override bool ShowWithoutActivation // stops the window from stealing focus { get { return true; } } // and const int WS_EX_NOACTIVATE = 0x08000000; const int WS_EX_TOPMOST = 0x00000008; protected override CreateParams CreateParams { get { CreateParams param = base.CreateParams; param.ExStyle |= WS_EX_TOPMOST; // make the form topmost param.ExStyle |= WS_EX_NOACTIVATE; // prevent the form from being activated return param; } } // and [DllImport("user32.dll")] private extern static IntPtr SetActiveWindow(IntPtr handle); private const int WM_ACTIVATE = 6; private const int WA_INACTIVE = 0; private const int WM_MOUSEACTIVATE = 0x0021; private const int MA_NOACTIVATEANDEAT = 0x0004; protected override void WndProc(ref Message m) { if (m.Msg == WM_MOUSEACTIVATE) { m.Result = (IntPtr)MA_NOACTIVATEANDEAT; // prevent the form from being clicked and gaining focus return; } if (m.Msg == WM_ACTIVATE) // if a message gets through to activate the form somehow { if (((int)m.WParam & 0xFFFF) != WA_INACTIVE) { if (m.LParam != IntPtr.Zero) { SetActiveWindow(m.LParam); } else { // Could not find sender, just in-activate it. SetActiveWindow(IntPtr.Zero); } } } |
我还在 GotFocus 事件中添加了 Form.Hide() ，这样即使它确实以某种方式获得焦点，它也会尽快关闭并离开用户。
此外，如果有人想知道，所有窗口样式等的常量都可以在 WINUSER.H 中找到，如果可以的话，它的在线地址为 http://www.woodmann.com/fravia/sources/WINUSER.H没找到。
但是，如果有人能看到更优雅的方法，将不胜感激。
在 WPF 中试试这个：
1 | ShowActivated="False" |
您正在寻找的可能是 WS_EX_NOACTIVATE 扩展窗口样式。单击时不会激活具有此样式的窗口。例如，虚拟键盘窗口具有这种样式。
要将此样式应用于窗口，请覆盖 CreateParams 函数并更改 baseParams.ExStyle.
我不是在这里寻找积分，因为原始发帖人已经发布了一个对他们有用的解决方案，但我想分享我在这个问题上的经验。使用上面的解决方案(在问题的底部而不是在答案形式中)在使用
我想出了一个替代解决方案来防止表单被点击使用
注意：在这种状态下，您根本无法与表单进行交互，甚至尝试单击"X"按钮只会单击该位置的表单后面的任何内容，因此您需要使用代码来关闭表单:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 | public partial class Form1 : Form { private enum GWL : int { ExStyle = -20 } private enum WS_EX : int { Transparent = 0x20, Layered = 0x80000 } public enum LWA : int { ColorKey = 0x1, Alpha = 0x2 } [DllImport("user32.dll")] static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong); [DllImport("user32.dll")] static extern bool SetLayeredWindowAttributes(IntPtr hwnd, uint crKey, byte bAlpha, uint dwFlags); protected override bool ShowWithoutActivation { get { return true; } } const int WS_EX_NOACTIVATE = 0x08000000; const int WS_EX_TOPMOST = 0x00000008; protected override CreateParams CreateParams { get { CreateParams param = base.CreateParams; param.ExStyle |= WS_EX_TOPMOST; // make the form topmost param.ExStyle |= WS_EX_NOACTIVATE; // prevent the form from being activated return param; } } public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { // Prevent form from showing up in taskbar which also prevents activation by Alt+Tab this.ShowInTaskbar = false; // Allow the form to be clicked through so that the message never physically interferes with work being done on the computer SetWindowLong(this.Handle, (int)GWL.ExStyle, (int)WS_EX.Layered | (int)WS_EX.Transparent); // Set the opacity of the form byte nOpacity = 255; // 0 = invisible, 255 = solid, anything inbetween will show the form with transparency SetLayeredWindowAttributes(this.Handle, 0, nOpacity, (uint)LWA.Alpha); } } |
我还能够通过对上面的
注意：这也使表单无法单击，但行为不同，因为您实际上可以单击最小、最大和"X"按钮，但当您这样做时没有任何反应。当您位于表单边缘时，鼠标光标也会发生变化，好像要调整大小但它不允许调整大小：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 | public partial class Form1 : Form { protected override bool ShowWithoutActivation { get { return true; } } const int WS_EX_NOACTIVATE = 0x08000000; const int WS_EX_TOPMOST = 0x00000008; protected override CreateParams CreateParams { get { CreateParams param = base.CreateParams; param.ExStyle |= WS_EX_TOPMOST; // make the form topmost param.ExStyle |= WS_EX_NOACTIVATE; // prevent the form from being activated return param; } } [DllImport("user32.dll")] private extern static IntPtr SetActiveWindow(IntPtr handle); private const int WM_ACTIVATE = 6; private const int WA_INACTIVE = 0; private const int WM_MOUSEACTIVATE = 0x0021; private const int MA_NOACTIVATEANDEAT = 0x0004; protected override void WndProc(ref Message m) { if (m.Msg == WM_MOUSEACTIVATE) { m.Result = (IntPtr)MA_NOACTIVATEANDEAT; // prevent the form from being clicked and gaining focus return; } if (m.Msg == WM_ACTIVATE) // if a message gets through to activate the form somehow { if (((int)m.WParam & 0xFFFF) != WA_INACTIVE) { if (m.LParam != IntPtr.Zero) { SetActiveWindow(m.LParam); } else { // Could not find sender, just in-activate it. SetActiveWindow(IntPtr.Zero); } } } else { base.WndProc(ref m); } } public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { // Prevent form from showing up in taskbar which also prevents activation by Alt+Tab this.ShowInTaskbar = false; } } |