77 lines
3.5 KiB
C#
77 lines
3.5 KiB
C#
 
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using System.Drawing;
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using System.Runtime.InteropServices;
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using System.Windows.Forms;
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namespace RemSound.App;
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/// <summary>
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/// Shows a dialog FRONT-AND-CENTRE with keyboard focus, WITHOUT disturbing the main window — it can
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/// stay minimised in the tray the whole time. We give the dialog a momentary, top-most, off-taskbar
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/// 1×1 owner window at screen centre and force THAT owner to the foreground (the AttachThreadInput
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/// dance bypasses Windows' focus-stealing lock), so the modal dialog opens on top with focus and a
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/// screen reader lands on it wherever RemSound happens to be sitting. Used for every warning/notice
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/// the app raises (mic-privacy, Realtek, About-after-update, config-moved), so a minimised RemSound
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/// never leaves a blind user with a dialog dinging away behind everything.
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/// </summary>
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internal static class ForegroundDialog
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{
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/// <summary>Run <paramref name="show"/> with a foreground 1×1 owner; returns its result.</summary>
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public static T Show<T>(Func<IWin32Window, T> show)
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{
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var area = Screen.PrimaryScreen?.WorkingArea ?? new Rectangle(0, 0, 800, 600);
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using var owner = new Form
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{
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ShowInTaskbar = false,
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FormBorderStyle = FormBorderStyle.None,
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StartPosition = FormStartPosition.Manual,
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Size = new Size(1, 1),
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Location = new Point(area.X + area.Width / 2, area.Y + area.Height / 2),
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TopMost = true,
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};
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owner.Show();
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ForceForeground(owner.Handle);
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try { return show(owner); }
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finally { try { owner.Close(); } catch { /* ignore */ } }
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}
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/// <summary>Void convenience overload.</summary>
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public static void Show(Action<IWin32Window> show) =>
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Show<object?>(owner => { show(owner); return null; });
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/// <summary>Force <paramref name="hWnd"/> to the foreground even when RemSound isn't the active
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/// app. A plain SetForegroundWindow from a background process is refused by Windows; attaching
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/// our input queue to the current foreground thread for the call lifts that restriction. The
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/// owner is top-most regardless, so this is belt-and-braces for focus.</summary>
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private static void ForceForeground(IntPtr hWnd)
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{
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try
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{
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var foreThread = GetWindowThreadProcessId(GetForegroundWindow(), out _);
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var thisThread = GetCurrentThreadId();
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if (foreThread != 0 && foreThread != thisThread)
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{
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AttachThreadInput(foreThread, thisThread, true);
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try
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{
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BringWindowToTop(hWnd);
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SetForegroundWindow(hWnd);
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}
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finally { AttachThreadInput(foreThread, thisThread, false); }
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}
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else
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{
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BringWindowToTop(hWnd);
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SetForegroundWindow(hWnd);
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}
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}
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catch { /* best-effort; the owner is top-most anyway */ }
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}
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[DllImport("user32.dll")] private static extern IntPtr GetForegroundWindow();
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[DllImport("user32.dll")] private static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint pid);
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[DllImport("user32.dll")] private static extern uint GetCurrentThreadId();
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[DllImport("user32.dll")] private static extern bool AttachThreadInput(uint idAttach, uint idAttachTo, bool fAttach);
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[DllImport("user32.dll")] private static extern bool SetForegroundWindow(IntPtr hWnd);
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[DllImport("user32.dll")] private static extern bool BringWindowToTop(IntPtr hWnd);
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}
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