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記錄修行的印記

鍵盤事件的傳遞

class Q_GUI_EXPORT QWidget : public QObject, public QPaintDevice
{
protected:
    QWidget(QWidgetPrivate &d, QWidget* parent, Qt::WindowFlags f);
}

/*!
\internal
*/
QWidget::QWidget(QWidgetPrivate &dd, QWidget* parent, Qt::WindowFlags f)
    : QObject(dd, 0), QPaintDevice()
{
    Q_D(QWidget);
    QT_TRY {
        d->init(parent, f);
    } QT_CATCH(

) {
        QWidgetExceptionCleaner::cleanup(this, d_func());
        QT_RETHROW;
    }
}

//鍵盤事件的傳遞
extern "C" LRESULT QT_WIN_CALLBACK QtWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
        case WM_CHAR: {
            MSG msg1;
            bool anyMsg = PeekMessage(&msg1, msg.hwnd, 0, 0, PM_NOREMOVE);
            if (anyMsg && msg1.message == WM_DEADCHAR) {
                result = true; // consume event since there is a dead char next
                break;
            }
            QWidget *g = QWidget::keyboardGrabber();
            if (g && qt_get_tablet_widget() && hwnd == qt_get_tablet_widget()->winId()) {
                // if we get an event for the internal tablet widget,
                // then don't send it to the keyboard grabber, but
                // send it to the widget itself (we don't use it right
                // now, just in case).
                g = 0;
            }
            if (g)
                widget = (QETWidget*)g;
            else if (QApplication::activePopupWidget())
                widget = (QETWidget*)QApplication::activePopupWidget()->focusWidget()
                       ? (QETWidget*)QApplication::activePopupWidget()->focusWidget()
                       : (QETWidget*)QApplication::activePopupWidget();
            else if (QApplication::focusWidget())  //這里條件為真
                widget = (QETWidget*)QApplication::focusWidget();  //得到具有輸入焦點(diǎn)的widget
            else if (!widget || widget->internalWinId() == GetFocus()) // We faked the message to go to exactly that widget.
                widget = (QETWidget*)widget->window();
            if (widget->isEnabled())
                result = sm_blockUserInput
                            ? true
                            : qt_keymapper_private()->translateKeyEvent(widget, msg, g != 0);
            break;
        }
    //..
}

extern "C" LRESULT QT_WIN_CALLBACK QtWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    if (qt_is_translatable_mouse_event(message)) {
        if (QApplication::activePopupWidget() != 0) { // in popup mode
            POINT curPos = msg.pt;
            QWidget* w = QApplication::widgetAt(curPos.x, curPos.y);
            if (w)
                widget = (QETWidget*)w;
        }

    if (!qt_tabletChokeMouse) {
        result = widget->translateMouseEvent(msg);
    }
    }
}

posted on 2013-07-04 12:02 天下閱讀(507) 評論(0) 編輯收藏引用所屬分類: QT

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