Initial push

LICENSE

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+MIT License
+
+Copyright (c) 2019 LumiaWOA
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+_____________________________________________________________________________
+
+Copyright (c) 2018 Konstantin Preißer, www.preisser-it.de
+
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

TaskDialog/LICENSE

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+Copyright (c) 2018 Konstantin Preißer, www.preisser-it.de
+
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

TaskDialog/TaskDialog.WindowSubclassHandler.cs

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+using System;
+
+namespace KPreisser.UI
+{
+    public partial class TaskDialog
+    {
+        private class WindowSubclassHandler : UI.WindowSubclassHandler
+        {
+            private readonly TaskDialog _taskDialog;
+
+            private bool _processedShowWindowMessage;
+
+            public WindowSubclassHandler(TaskDialog taskDialog)
+                : base(taskDialog?._hwndDialog ?? throw new ArgumentNullException(nameof(taskDialog)))
+            {
+                _taskDialog = taskDialog;
+            }
+
+            protected override unsafe IntPtr WndProc(int msg, IntPtr wParam, IntPtr lParam)
+            {
+                switch (msg)
+                {
+                    case TaskDialogNativeMethods.WM_WINDOWPOSCHANGED:
+                        IntPtr result = base.WndProc(msg, wParam, lParam);
+
+                        ref TaskDialogNativeMethods.WINDOWPOS windowPos =
+                                ref *(TaskDialogNativeMethods.WINDOWPOS*)lParam;
+
+                        if ((windowPos.flags & TaskDialogNativeMethods.WINDOWPOS_FLAGS.SWP_SHOWWINDOW) ==
+                                TaskDialogNativeMethods.WINDOWPOS_FLAGS.SWP_SHOWWINDOW &&
+                                !_processedShowWindowMessage)
+                        {
+                            _processedShowWindowMessage = true;
+
+                            // The task dialog window has been shown for the first time.
+                            _taskDialog.OnShown(EventArgs.Empty);
+                        }
+
+                        return result;
+
+                    case ContinueButtonClickHandlingMessage:
+                        // We received the message which we posted earlier when
+                        // handling a TDN_BUTTON_CLICKED notification, so we should
+                        // no longer ignore such notifications.
+                        _taskDialog._ignoreButtonClickedNotifications = false;
+
+                        // Do not forward the message to the base class.
+                        return IntPtr.Zero;
+
+                    default:
+                        return base.WndProc(msg, wParam, lParam);
+                }
+            }
+        }
+    }
+}