从Qt4移植后，带有Win32 HWND嵌入的Qt5 QWidget :: create()不再起作用 [英] Qt5 QWidget::create() with Win32 HWND embedding not longer working after port from Qt4

查看：135 发布时间：2020/5/20 23:17:34 c++ windows qt opengl

本文介绍了从Qt4移植后，带有Win32 HWND嵌入的Qt5 QWidget :: create()不再起作用的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

以下代码尝试使用create方法将自定义创建的OpenGL窗口的本机Win32 HWND嵌入到QWidget中:

the following code tries to embed a native Win32 HWND of a custom created OpenGL windows into a QWidget using the create method:

viewer_widget::viewer_widget(
    QWidget* parent,
    const viewer::viewer_attributes&     view_attrib,
    const wm::context::attribute_desc&   ctx_attrib,
    const wm::surface::format_desc&      win_fmt)
  : QWidget(parent)
{
    setMouseTracking(true);
    setFocusPolicy(Qt::StrongFocus);

    setAttribute(Qt::WA_NativeWindow, true);
    setAttribute(Qt::WA_PaintOnScreen, true); // disables qt double buffering (seems X11 only since qt4.5, ...)
    setAttribute(Qt::WA_NoSystemBackground, true);
    setAutoFillBackground(false);

    _viewer = make_shared<viewer>(math::vec2ui(100, 100), parent->winId(), view_attrib, ctx_attrib, win_fmt);

    // ok set the native window as this widgets window...and hold thumbs
    QWidget::create(_viewer->window()->window_handle(), true, true);
}

查看器创建一个本机Win32(或X11)窗口，并以QWidget的父级作为父级.它还创建并初始化OpenGL上下文.这样做是为了更好地控制上下文的创建和实时(我知道Qt5在这方面有了很大的改进).现在，QWidget :: create()方法将获取本机窗口的HWND并将其嵌入到当前的QWidget中，以便完全通过Qt完成事件处理.

The viewer creates a native Win32 (or X11) window wit the parent of the QWidget as a parent. It also creates and initializes an OpenGL context. This was/is done for more control over the context creation and live time (I know that Qt5 is much improved in that regard). The QWidget::create() method now takes the HWND of the native window and embeds it into the current QWidget, so that event handling is completely done through Qt.

这在Qt4上完美运行(最新使用的是Windows 7/Visual Studio 2013上的Qt 4.8.6 x64(在Visual Studio 2013上为x64).

This works perfectly on Qt4 (latest used is Qt 4.8.6 x64 on Windows 7/8.1 x64 on Visual Studio 2013).

现在，当移植到Qt5时，根据Qt5文档，相同的代码仍然可以正常工作.它需要进行细微的更改以解决WId类型的更改. QWidget :: winId()方法仍然返回小部件的本机HWND句柄，我已使用spyxx.exe(Visual Studio工具)对其进行了验证.

Now when porting to Qt5 the same code should still work according to the Qt5 documentation. It required minor changes to account for the change in the WId type. The QWidget::winId() methods still return the native HWND handles of the widgets, which I verified using spyxx.exe (Visual Studio Tools).

但是，该代码不再起作用(在Windows 7/Visual Studio 2013上使用Qt 5.4.0 x64(在Visual Studio 2013上使用x64)).本机窗口只是未嵌入.在Qt4中，当检查创建的QWidget时，其在创建调用之后的本机句柄(winId)与本机HWND相同，这意味着嵌入有效.现在使用Qt5，QWidget包含了自己的HWND，我可以再次使用spyxx.exe进行确认.现在有一个父窗口小部件/窗口和两个子窗口小部件/窗口，其中应该只有一个子窗口(本机窗口小窗口).我查看了两个Qt版本的create()方法的源代码，但我不明白为什么它不再起作用.

However, the code does not work anymore (using Qt 5.4.0 x64 on Windows 7/8.1 x64 on Visual Studio 2013). The native window is just not embedded. In Qt4 when inspecting the created QWidget its native handle (winId) after the create call was identical to the native HWND, which meant the embedding worked. Now using Qt5 the QWidget contains its own HWND which I could again confirm using spyxx.exe. Now there is the parent widget/window and two child widgets/windows where there should only be one child (the native one). I looked at the source code of the create() method for both Qt versions and I do not understand why it is not working anymore.

好吧，在第一天晚上想弄清楚这一点之后，我尝试了在论坛或文档中可以找到的其他几种方法:

Ok, after the first night trying to figure this out I tried several other methods I could find on forums or the documentation:

QWindow :: fromWinId(HWND)和QWidget :: createWindowContainer(QWindow):这似乎是Qt-Devs希望我这样做的方式:

_viewer = make_shared<viewer>(math::vec2ui(100, 100), par_hndl, view_attrib, ctx_attrib, win_fmt);
QWindow* native_wnd  = QWindow::fromWinId((WId)_viewer->window()->window_handle());
QWidget* native_wdgt = QWidget::createWindowContainer(native_wnd);

QHBoxLayout* lo        = new QHBoxLayout(this);
lo->setContentsMargins(0, 0, 0, 0);
lo->addWidget(native_wdgt);

这至少表现得几乎与我期望的一样.我看到了我的窗口，并且在新创建的窗口小部件中嵌入了本机窗口.但是:我发现 no 方法无法从该新创建的小部件中获取任何鼠标事件/输入.我添加了一个没有好运的eventFilter.我尝试了带有透明顶级窗口小部件的QStackedLayout来捕获输入，但是由于通过createWindowContainer()创建的窗口小部件总是在Windows堆栈顶部，因此该方法不起作用.我尝试创建一个QWindow派生的类来拦截nativeEvent()调用，但是没有运气...

This at least at least behaves almost the way I expect. I see my window and in the newly created widget the native window is embedded. BUT: I have found no way to get any mouse events/input from that newly created widget. I added an eventFilter without luck. I tried a QStackedLayout with a transparent top-level widget to catch the input, but this does not work as the widget created through createWindowContainer() is always on top of the windows stack. I tries creating a QWindow-derived class to intercept the nativeEvent() invocation, without luck...

我想尽一切办法使Qt4能够正常工作.我有什么可以改变的方式来恢复旧的行为?我可以使用Qt :: StrongFocus策略在父窗口小部件中跟踪键盘输入，但是鼠标输入会被本机窗口完全吞噬.我无法移动Qt5 OpenGL窗口代码，需要使用我们的自定义OpenGL上下文工具，因为我们正在处理Qt5仍不完全支持的上下文.

I am at the end of my ideas to get this working as with Qt4. Is there anything I can to differently to get the old behavior back? The keyboard input I can track through the parent widget using a Qt::StrongFocus policy but the mouse input in complete swallows by the native window. I cannot move the the Qt5 OpenGL window code and need to use our custom OpenGL context tools as we are doing things with the contexts that Qt5 still does not fully support.

我还不能在Linux上尝试Qt5，但是上面看到的Qt4代码确实可以在这里工作.

I could not yet try Qt5 on Linux, but the Qt4 code as seen above did work there.

从Qt4移植后，带有Win32 HWND嵌入的Qt5 QWidget :: create()不再起作用 [英] Qt5 QWidget::create() with Win32 HWND embedding not longer working after port from Qt4

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从Qt4移植后，带有Win32 HWND嵌入的Qt5 QWidget :: create()不再起作用 [英] Qt5 QWidget::create() with Win32 HWND embedding not longer working after port from Qt4

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