Unity3d user32.dll 拖动 window 并取回焦点

Question

我做了一个无边框的 windowed 应用程序和一个 "fake" 标题栏来拖动它。

我正在使用 user32.dll、

这将开始 window 拖动（由 unity IBeginDragHandler 触发）：

public const int WM_NCLBUTTONDOWN = 0xA1;
public const int WM_NCLBUTTONUP = 0x00A2;
public const int WM_LBUTTONUP = 0x0202;

[DllImport("User32.dll")]
public static extern bool ReleaseCapture();

[DllImport("User32.dll")]
public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

IntPtr window = GetActiveWindow();
...
...
ReleaseCapture();
SendMessage(window, WM_NCLBUTTONDOWN, HTCAPTION, 0);

然后停止拖动（这部分不确定）：

    ReleaseCapture();
    SendMessage(window, WM_NCLBUTTONUP, HTCAPTION, 0);
    SendMessage(window, WM_LBUTTONUP, HTCAPTION, 0);

它在编辑器和构建上运行良好，但在开发构建时产生错误：

An abnormal situation has occurred: the PlayerLoop internal function has been called recursively. Please contact Customer Support with a sample project so that we can reproduce the problem and troubleshoot it. LauncherWindow:SendMessage(IntPtr, Int32, Int32, Int32) LauncherWindow:StartWindowDrag() (at E:\Unity Projects\Crime Club Launcher\Assets\Scripts\Lib\LauncherWindow.cs:115) WindowDragZone:UnityEngine.EventSystems.IBeginDragHandler.OnBeginDrag(PointerEventData) (at E:\Unity Projects\Crime Club Launcher\Assets\WindowDragZone.cs:9) UnityEngine.EventSystems.ExecuteEvents:Execute(IBeginDragHandler, BaseEventData) (at C:\buildslave\unity\build\Extensions\guisystem\UnityEngine.UI\EventSystem\ExecuteEvents.cs:64) UnityEngine.EventSystems.ExecuteEvents:Execute(GameObject, BaseEventData, EventFunction`1) (at C:\buildslave\unity\build\Extensions\guisystem\UnityEngine.UI\EventSystem\ExecuteEvents.cs:261) UnityEngine.EventSystems.PointerInputModule:ProcessDrag(PointerEventData) (at C:\buildslave\unity\build\Extensions\guisystem\UnityEngine.UI\EventSystem\InputModules\PointerInputModule.cs:261) UnityEngine.EventSystems.StandaloneInputModule:ProcessMouseEvent(Int32) (at C:\buildslave\unity\build\Extensions\guisystem\UnityEngine.UI\EventSystem\InputModules\StandaloneInputModule.cs:434) UnityEngine.EventSystems.StandaloneInputModule:ProcessMouseEvent() (at C:\buildslave\unity\build\Extensions\guisystem\UnityEngine.UI\EventSystem\InputModules\StandaloneInputModule.cs:412) UnityEngine.EventSystems.StandaloneInputModule:Process() (at C:\buildslave\unity\build\Extensions\guisystem\UnityEngine.UI\EventSystem\InputModules\StandaloneInputModule.cs:186) UnityEngine.EventSystems.EventSystem:Update() (at C:\buildslave\unity\build\Extensions\guisystem\UnityEngine.UI\EventSystem\EventSystem.cs:283)

你怎么看这个？

编辑： 好的，所以我终于通过替换

摆脱了那个错误

SendMessage(window, WM_NCLBUTTONDOWN, HTCAPTION, 0);

来自：

private const int WM_SYSCOMMAND = 0x112;
private const int MOUSE_MOVE = 0xF012;
SendMessage(window, WM_SYSCOMMAND, MOUSE_MOVE, 0);

现在我有最后一个小问题： windows 在鼠标释放时被拖放，但我看起来 window 正在失去对类似内容的关注：第一次点击总是错过，我必须点击两次才能再次拖动或简单地与 unity 应用程序交互。

我在 OnEndDrag 中尝试了 User32 的函数： ShowWindow、SetActiveWindow、SetFocus 等... 我发现的所有内容都与该问题有关，但它们都没有明显效果，我仍然必须单击两次。

Answer 1

最终通过将 SendMessage() 替换为 :

摆脱了这个错误

SendMessageCallback(window, WM_SYSCOMMAND, MOUSE_MOVE, 0, WindowDropCallback, 0);

Unity3d user32.dll 拖动 window 并取回焦点

Unity3d user32.dll drag window and take focus back

c#

user32

unity3d