76 lines
2.6 KiB
C#
76 lines
2.6 KiB
C#
using System;
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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 KaraokePlayer
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{
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public partial class OverlayForm : Form
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{
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private const int DwmwaTransitionsForcedisabled = 3;
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ContainerControl _parent;
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public OverlayForm(ContainerControl parent)
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{
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InitializeComponent();
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_parent = parent;
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BackColor = Color.FromArgb(1, 1, 1);
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TransparencyKey = Color.FromArgb(1, 1, 1);
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FormBorderStyle = FormBorderStyle.None;
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ControlBox = false;
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ShowInTaskbar = false;
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StartPosition = FormStartPosition.Manual;
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AutoScaleMode = AutoScaleMode.None;
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Location = parent.PointToScreen(Point.Empty);
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ClientSize = parent.ClientSize;
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Show(parent);
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parent.ParentForm.LocationChanged += Cover_LocationChanged;
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parent.ClientSizeChanged += Cover_ClientSizeChanged;
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// Disable Aero transitions, the plexiglass gets too visible
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if (Environment.OSVersion.Version.Major >= 6)
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{
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var value = 1;
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DwmSetWindowAttribute(parent.ParentForm.Handle, DwmwaTransitionsForcedisabled, ref value, 4);
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}
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}
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public sealed override Color BackColor
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{
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get { return base.BackColor; }
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set { base.BackColor = value; }
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}
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private void Cover_LocationChanged(object sender, EventArgs e)
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{
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Location = _parent.PointToScreen(Point.Empty);
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}
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private void Cover_ClientSizeChanged(object sender, EventArgs e)
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{
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ClientSize = _parent.ClientSize;
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}
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protected override void OnFormClosing(FormClosingEventArgs e)
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{
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// Restore owner
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Owner.LocationChanged -= Cover_LocationChanged;
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Owner.ClientSizeChanged -= Cover_ClientSizeChanged;
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if (!Owner.IsDisposed && Environment.OSVersion.Version.Major >= 6)
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{
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var value = 1;
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DwmSetWindowAttribute(Owner.Handle, DwmwaTransitionsForcedisabled, ref value, 4);
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}
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base.OnFormClosing(e);
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}
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protected override void OnActivated(EventArgs e)
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{
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// Always keep the owner activated instead
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// BeginInvoke(new Action(() => Owner.Activate()));
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}
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[DllImport("dwmapi.dll")]
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private static extern int DwmSetWindowAttribute(IntPtr hWnd, int attr, ref int value, int attrLen);
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}
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}
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