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Merge pull request #387 from vatsanm/master
Issue #385: SetWindowLongPtr on 32-bit
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| // Copyright (c) All contributors. All rights reserved. | ||
| // Licensed under the MIT license. See LICENSE file in the project root for full license information. | ||
|
|
||
| using System; | ||
| using System.Runtime.InteropServices; | ||
| using PInvoke; | ||
|
|
||
| /// <content> | ||
| /// Contains the inner class <see cref="HwndSubClass"/> | ||
| /// </content> | ||
| public partial class User32Facts | ||
| { | ||
| /// <summary> | ||
| /// Helper to subclass an HWND using SetWindowLongPtr | ||
| /// </summary> | ||
| private class HwndSubClass : IDisposable | ||
| { | ||
| /// <summary> | ||
| /// Keeps track of whether this instnace has been disposed, or not. | ||
| /// </summary> | ||
| private bool disposed = false; | ||
|
|
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| /// <summary> | ||
| /// Initializes a new instance of the <see cref="HwndSubClass"/> class. | ||
| /// </summary> | ||
| /// <param name="hWnd">The HWND being subclassed</param> | ||
| internal HwndSubClass(IntPtr hWnd) | ||
| { | ||
| this.HWnd = hWnd; | ||
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| unsafe | ||
| { | ||
| this.WindowProc = new User32.WndProc(this.HookProc); | ||
| this.WindowProcPointer = Marshal.GetFunctionPointerForDelegate(this.WindowProc); | ||
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| this.OldWindowProcPointer = | ||
| User32.SetWindowLongPtr(this.HWnd, User32.WindowLongIndexFlags.GWLP_WNDPROC, this.WindowProcPointer); | ||
| } | ||
| } | ||
|
|
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| /// <summary> | ||
| /// Finalizes an instance of the <see cref="HwndSubClass"/> class. | ||
| /// </summary> | ||
| ~HwndSubClass() | ||
| { | ||
| this.Dispose(false); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Event fired in response to every window message | ||
| /// </summary> | ||
| internal event EventHandler<WindowMessage> WindowMessage; | ||
|
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| /// <summary> | ||
| /// Gets the new Window proceduce's address that has been replaced in the HWND | ||
| /// </summary> | ||
| internal IntPtr WindowProcPointer { get; } | ||
|
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| /// <summary> | ||
| /// Gets the Window procedure delegate that has been used to subclass the supplied HWND | ||
| /// </summary> | ||
| internal User32.WndProc WindowProc { get; } | ||
|
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| private IntPtr HWnd { get; set; } | ||
|
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| /// <summary> | ||
| /// Gets or sets the original window procedures address. This will be replaced back | ||
| /// to the HWND when this instance of <see cref="HwndSubClass"/> is disposed | ||
| /// </summary> | ||
| private IntPtr OldWindowProcPointer { get; set; } | ||
|
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||
| /// <summary> | ||
| /// Frees resources | ||
| /// </summary> | ||
| public void Dispose() | ||
| { | ||
| this.Dispose(true); | ||
| GC.SuppressFinalize(this); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// This is the replaces Window Procedure which will be used to track all window messages, | ||
| /// and generate events | ||
| /// </summary> | ||
| /// <param name="hWnd">The window handle</param> | ||
| /// <param name="msg">Message ID</param> | ||
| /// <param name="wParam">The wParam value</param> | ||
| /// <param name="lParam">The lParam value</param> | ||
| /// <returns>Message specific return value</returns> | ||
| internal unsafe IntPtr HookProc(IntPtr hWnd, User32.WindowMessage msg, void* wParam, void* lParam) | ||
| { | ||
| this.WindowMessage?.Invoke(this, new WindowMessage(msg, new IntPtr(wParam), new IntPtr(lParam))); | ||
| return User32.DefWindowProc(hWnd, msg, new IntPtr(wParam), new IntPtr(lParam)); | ||
| } | ||
|
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| /// <summary> | ||
| /// Cleanup - replaces the HWND with its original Window Procedure and marks this | ||
| /// instance of <see cref="HwndSubClass"/> as disposed. | ||
| /// </summary> | ||
| /// <param name="disposing">When true, indicates that this call is coming from a <see cref="Dispose()"/> call, | ||
| /// and when false, indicates that this call is coming from the finalizer</param> | ||
| protected virtual void Dispose(bool disposing) | ||
| { | ||
| if (!this.disposed) | ||
| { | ||
| this.disposed = true; | ||
| if (this.HWnd != IntPtr.Zero && this.OldWindowProcPointer != IntPtr.Zero) | ||
| { | ||
| User32.SetWindowLongPtr(this.HWnd, User32.WindowLongIndexFlags.GWLP_WNDPROC, this.OldWindowProcPointer); | ||
| this.HWnd = IntPtr.Zero; | ||
| this.OldWindowProcPointer = IntPtr.Zero; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| // Copyright (c) All contributors. All rights reserved. | ||
| // Licensed under the MIT license. See LICENSE file in the project root for full license information. | ||
|
|
||
| using System; | ||
| using PInvoke; | ||
|
|
||
| /// <content> | ||
| /// Contains the nested class <see cref="WindowMessage"/> | ||
| /// </content> | ||
| public partial class User32Facts | ||
| { | ||
| /// <summary> | ||
| /// A simple wrapper representig a Window Message's payload | ||
| /// </summary> | ||
| private class WindowMessage | ||
| { | ||
| /// <summary> | ||
| /// Initializes a new instance of the <see cref="WindowMessage"/> class. | ||
| /// </summary> | ||
| /// <param name="msg">Window Message ID</param> | ||
| /// <param name="wParam">The wParam value</param> | ||
| /// <param name="lParam">The lparam value</param> | ||
| internal WindowMessage(User32.WindowMessage msg, IntPtr wParam, IntPtr lParam) | ||
| { | ||
| this.Message = msg; | ||
| this.WParam = wParam; | ||
| this.LParam = lParam; | ||
| } | ||
|
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| /// <summary> | ||
| /// Gets the Window Message ID | ||
| /// </summary> | ||
| internal User32.WindowMessage Message { get; } | ||
|
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| /// <summary> | ||
| /// Gets the wParam value | ||
| /// </summary> | ||
| internal IntPtr WParam { get; } | ||
|
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| /// <summary> | ||
| /// Gets the lParam value | ||
| /// </summary> | ||
| internal IntPtr LParam { get; } | ||
| } | ||
| } |
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