mirror of https://github.com/dahall/Vanara.git
More work on BasicMessageWindow
parent
c70614bd19
commit
5c0f92d07c
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@ -5,6 +5,19 @@ using static Vanara.PInvoke.User32;
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namespace Vanara.PInvoke
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{
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/// <summary>A filter method that handles messages sent to a window.</summary>
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/// <param name="hwnd">A handle to the window.</param>
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/// <param name="msg">The MSG.</param>
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/// <param name="wParam">Additional message information. The contents of this parameter depend on the value of the uMsg parameter.</param>
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/// <param name="lParam">Additional message information. The contents of this parameter depend on the value of the uMsg parameter.</param>
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/// <param name="lReturn">The return value is the result of the message processing and depends on the message sent.</param>
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/// <returns>
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/// <see langword="true"/> if the message is handled and <see cref="DefWindowProc(HWND, uint, IntPtr, IntPtr)"/> should not be called;
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/// <see langword="false"/> otherwise.
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/// </returns>
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[UnmanagedFunctionPointer(CallingConvention.Winapi)]
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public delegate bool BasicMessageWindowFilter(HWND hwnd, uint msg, IntPtr wParam, IntPtr lParam, out IntPtr lReturn);
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/// <summary>Simple window to process messages.</summary>
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/// <seealso cref="System.MarshalByRefObject"/>
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/// <seealso cref="System.IDisposable"/>
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@ -15,12 +28,10 @@ namespace Vanara.PInvoke
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private bool isDisposed;
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/// <summary>Initializes a new instance of the <see cref="BasicMessageWindow"/> class.</summary>
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/// <param name="callback">
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/// Specifies the callback method to use to process messages. A <see langword="null"/> value will just use <c>DefWindowProc</c>.
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/// </param>
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public BasicMessageWindow(WindowProc callback = null)
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/// <param name="callback">Specifies the callback method to use to process messages.</param>
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public BasicMessageWindow(BasicMessageWindowFilter callback = null)
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{
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Callback = callback;
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MessageFilter = callback;
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ClassName = $"MessageWindowBase+{Guid.NewGuid()}";
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hwnd = CreateWindow();
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@ -29,10 +40,6 @@ namespace Vanara.PInvoke
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/// <summary>Finalizes an instance of the <see cref="BasicMessageWindow"/> class.</summary>
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~BasicMessageWindow() => Dispose(false);
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/// <summary>Gets or sets the callback method used to filter window messages.</summary>
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/// <value>The callback method.</value>
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public WindowProc Callback { get; set; }
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/// <summary>Gets the name of the class.</summary>
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/// <value>The name of the class.</value>
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public string ClassName { get; private set; }
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@ -41,6 +48,10 @@ namespace Vanara.PInvoke
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/// <value>The handle.</value>
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public HWND Handle => hwnd;
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/// <summary>Gets or sets the callback method used to filter window messages.</summary>
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/// <value>The callback method.</value>
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public BasicMessageWindowFilter MessageFilter { get; set; }
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/// <summary>Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.</summary>
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public void Dispose()
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{
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@ -81,7 +92,11 @@ namespace Vanara.PInvoke
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private IntPtr WndProc(HWND hwnd, uint msg, IntPtr wParam, IntPtr lParam)
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{
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var ret = (Callback ?? DefWindowProc).Invoke(hwnd, msg, wParam, lParam);
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IntPtr ret;
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if (!(MessageFilter is null) && MessageFilter.Invoke(hwnd, msg, wParam, lParam, out var lRet))
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ret = lRet;
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else
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ret = DefWindowProc(hwnd, msg, wParam, lParam);
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if (msg == (uint)WindowMessage.WM_NCDESTROY)
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Dispose(true);
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@ -36,11 +36,12 @@ namespace Vanara.PInvoke.Tests
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timer.Stop();
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Assert.True(gotMsg);
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IntPtr meth(HWND hwnd, uint uMsg, IntPtr wParam, IntPtr lParam)
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bool meth(HWND hwnd, uint uMsg, IntPtr wParam, IntPtr lParam, out IntPtr lReturn)
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{
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lReturn = default;
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TestContext.WriteLine($"{timer.ElapsedMilliseconds} Message: {(WindowMessage)uMsg} ({uMsg})");
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gotMsg = true;
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return DefWindowProc(hwnd, uMsg, wParam, lParam);
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return false;
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}
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}
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