mirror of https://github.com/dahall/Vanara.git
64 lines
1.8 KiB
C#
64 lines
1.8 KiB
C#
using System.Security;
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using System.Windows.Forms;
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using Vanara.PInvoke;
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namespace Vanara.Windows.Shell;
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internal interface IMessageWindowHost
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{
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void WndProc(ref Message msg);
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}
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[System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
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[SecuritySafeCritical]
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internal class HostedMessageWindow<THost> : NativeWindow where THost : IMessageWindowHost
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{
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private readonly THost host;
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private GCHandle rooting;
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internal HostedMessageWindow(THost host) => this.host = host ?? throw new ArgumentNullException(nameof(host));
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~HostedMessageWindow()
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{
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if (Handle != default && !DoNotClose)
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User32.PostMessage(Handle, (uint)User32.WindowMessage.WM_CLOSE);
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}
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protected virtual bool DoNotClose => false;
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public void LockReference(bool locked)
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{
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if (locked)
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{
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if (!rooting.IsAllocated)
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rooting = GCHandle.Alloc(host, GCHandleType.Normal);
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}
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else
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{
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if (rooting.IsAllocated)
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rooting.Free();
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}
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}
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protected override void OnThreadException(Exception e) => Application.OnThreadException(e);
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[System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
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protected override void WndProc(ref Message m)
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{
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host.WndProc(ref m);
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base.WndProc(ref m);
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}
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}
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[System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
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internal class WindowMessageHook<THost> : HostedMessageWindow<THost> where THost : IMessageWindowHost
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{
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public WindowMessageHook(Control parent, THost host) : base(host)
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{
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if (parent is null) throw new ArgumentNullException(nameof(parent));
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parent.HandleCreated += (s, e) => AssignHandle(((Control?)s)?.Handle ?? IntPtr.Zero);
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parent.HandleDestroyed += (s, e) => ReleaseHandle();
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}
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protected override bool DoNotClose => true;
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} |