QWinWidget Inside MFC对话框不重新绘制或响应标签/箭头键 [英] QWinWidget Inside MFC Dialog Not Repainting or Responding to Tab/Arrow keys

问题描述

我在MFC对话框中使用 QWinWidget ，并且QWinWidget无法正确绘制本身，并且无法正确处理键盘输入。

I am using a QWinWidget inside of an MFC dialog and the QWinWidget is not drawing itself correctly and it is not handling keyboard input correctly.

QWinWidget，我有一个QTableWidget。当我滚动QTableWidget，它不会重画本身，直到我停止滚动，在这一点，它重绘一切。类似地，我可以在QTableWidget中输入单元格，控件不更新，直到我强制它通过向上或向下滚动重新更新（滚动停止时重新更新）。

Within the QWinWidget, I have a QTableWidget. When I scroll the QTableWidget, it does not redraw itself until I stop scrolling, at which point it redraws everything. Similarly, I can type into cells in the QTableWidget and the control is not updated until I force it to re-update by scrolling up or down (it re-updates when the scrolling stops).

由于这个QWinWidget放在一个MFC CDialog中，我试图覆盖CDialog的OnPaint方法，只调用QWinWidget :: repaint方法，但是这有相反的问题，现在只有QWinWidget被更新，CDialog从来没有重绘，导致工件。如果我调用QWinWidget :: repaint和CDialog :: OnPaint，结果是相同的，没有重写OnPaint方法。有人看过这个问题或知道如何解决这个问题吗？

Since this QWinWidget is housed in an MFC CDialog, I tried overriding the CDialog's OnPaint method and only call the QWinWidget::repaint method, however this has the opposite problem where now only the QWinWidget is updated and the CDialog is never redrawn, resulting in artifacts. If I call QWinWidget::repaint and CDialog::OnPaint, the result is the same as not overriding the OnPaint method. Has anyone ever seen this problem or know how to resolve it?

QWinWidget中的控件会正确响应Tab键或箭头键。标签/箭头键简单地跳过整个QWinWidget（和所有子控件）。即使我点击QWinWidget里面并选择一个控件，下一次按Tab键，它会完全跳过整个QWinWidget的焦点。

None of the controls within the QWinWidget respond to the tab key or arrow keys correctly. The tab/arrow keys simply skip over the entire QWinWidget (and all child controls). Even if I click inside the QWinWidget and select a control, the next time I press the tab key, it skips the focus completely out of the entire QWinWidget.

我注意到QWinWidget有两个函数，QWinWidget :: focusNextPrevChild和QWinWidget :: focusInEvent，他们都有一个注释标题说\reimp。我应该重写这些功能，以获得正确的选项卡功能？

I noticed that the QWinWidget has two functions, QWinWidget::focusNextPrevChild and QWinWidget::focusInEvent and both of them have a comment header saying "\reimp". Am I supposed to override these functions in order to get correct tab functionality? If so, how can these functions be implemented for correct tab functionality.

推荐答案

我修正了键盘输入问题。 QWinWidget类需要一些变化：

I have fixed the keyboard input issue. The QWinWidget class needed some changes:

在QWinWidget :: init方法中，WS_TABSTOP必须添加到窗口样式：

in the QWinWidget::init method, the WS_TABSTOP must be added to the window style:

SetWindowLong(winId(), GWL_STYLE, WS_CHILD | WS_CLIPCHILDREN | WS_CLIPSIBLINGS | WS_TABSTOP);

此外，QWinWidget :: winEvent方法需要响应WM_GETDLGCODE，让Windows知道有兴趣接收键/标签输入。我必须添加这个if块：

Also, the QWinWidget::winEvent method needs to respond to the WM_GETDLGCODE to let Windows know that it is interested in receiving key/tab inputs. I had to add this if block:

if(msg->message == WM_GETDLGCODE)
{
   *result = DLGC_WANTARROWS | DLGC_WANTTAB;
   return(true);
}

我还在努力让小部件正确地绘制。

I am still working on getting the widget to paint properly.

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