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Код


void CTest::keyPressEvent(QKeyEvent*ev)
{
    int shift = (ev->modifiers() & Qt::ShiftModifier) ? Qt::SHIFT : 0;
    int ctrl = (ev->modifiers() & Qt::ControlModifier) ? Qt::CTRL : 0;
    int alt = (ev->modifiers() & Qt::AltModifier) ? Qt::ALT : 0;
    QKeySequence ks(ev->key() + shift + ctrl + alt);
    QList<QPair<QWidget*,bool> >widgets;
    foreach(QObject*child,children())
        if(child->isWidgetType()) {
            QAbstractButton*but = qobject_cast<QAbstractButton*>(child);
            if(but && but->isVisible() && (but->shortcut() == ks)) {
                widgets.append(QPair<QWidget*,bool>(but,true));
            }
            QLabel*label = qobject_cast<QLabel*>(child);
            if(label && label->isVisible() && label->buddy() && (ks == QKeySequence::mnemonic(label->text()))) {
                widgets.append(QPair<QWidget*,bool>(label->buddy(),false));
            }
        }
    if(widgets.count()) {
        QPair<QWidget*,bool>pair;
        int index = 0;
        int last = widgets.count()-1;
        for(int i=last;i>=0;i--) {
            if(widgets.at(i).first->hasFocus()) {
                index = (i == last) ? 0 : (i+1);
                break;
            }
        }
        pair = widgets.at(index);
        pair.first->setFocus();
        if(pair.second) {
            QAbstractButton*but = qobject_cast<QAbstractButton*>(pair.first);
            Q_ASSERT(but);
            but->click();
        }
        ev->accept();
    } else {
        ev->ignore();
    }
}

Код


class QWidget; //forward declaration - for faster compilation
class QKeyEvent; //forward declaration- for faster compilation
bool checkWidgetShortcuts(QWidget*widget,QKeyEvent*ev);

Код


#include <QWidget>
#include <QKeyEvent>
#include <QAbstractButton>
#include <QLabel>
#include <QTabWidget>
#include "qglobal.h"

namespace {
    struct SItem
    {
        QWidget*w;
        enum EType {
            BUTTON,
            LABEL,
            TAB
        } type;
        int data;

        SItem(QWidget*_w,EType _t,int _d=0) : w(_w),type(_t),data(_d) {}
    };

    QList<QWidget*> visible_widgets(QWidget*w)
    {
        QList<QWidget*> list;
        Q_ASSERT(w);
        if(w->isVisible() && w->isEnabled()) {
            list.append(w);
            foreach(QObject*child,w->children())
                if(child->isWidgetType())
                    list << visible_widgets(qobject_cast<QWidget*>(child));
        }
        return list;
    }
} //anonymus namespace

bool checkWidgetShortcuts(QWidget*widget,QKeyEvent*ev)
{
    Q_ASSERT(widget && ev);
    bool ret_val = false;
    int shift = (ev->modifiers() & Qt::ShiftModifier) ? (int)Qt::SHIFT : 0;
    int ctrl = (ev->modifiers() & Qt::ControlModifier) ? (int)Qt::CTRL : 0;
    int alt = (ev->modifiers() & Qt::AltModifier) ? (int)Qt::ALT : 0;
    QKeySequence ks(ev->key() + shift + ctrl + alt);
    QList<SItem>list;
    foreach(QWidget*cw,visible_widgets(widget)) {
        if(qobject_cast<QAbstractButton*>(cw)) {
            QAbstractButton*but = qobject_cast<QAbstractButton*>(cw);
            if(but->shortcut() == ks)
                list.append(SItem(but,SItem::BUTTON));
        } else if(qobject_cast<QLabel*>(cw)) {
            QLabel*label = qobject_cast<QLabel*>(cw);
            if(label->buddy() && label->buddy()->isVisible()
                && (ks == QKeySequence::mnemonic(label->text())))
            {
                list.append(SItem(label->buddy(),SItem::LABEL));
            }
        } else if(qobject_cast<QTabWidget*>(cw)) {
            QTabWidget*tab = qobject_cast<QTabWidget*>(cw);
            for(int i=0;i<tab->count();i++)
                if(ks == QKeySequence::mnemonic(tab->tabText(i))) {
                    list.append(SItem(tab,SItem::TAB,i));
                    break;
                }
        }
    }
    if(list.count()) {
        int index = 0;
        int last = list.count()-1;
        for(int i=last;i>=0;i--) {
            if(list.at(i).w->hasFocus()) {
                index = (i == last) ? 0 : (i+1);
                break;
            }
        }
        const SItem& item = list.at(index);
        item.w->setFocus();
        switch(item.type) {
        case SItem::BUTTON: qobject_cast<QAbstractButton*>(item.w)->click(); break;
        case SItem::LABEL: break; //do nothing - just check
        case SItem::TAB: qobject_cast<QTabWidget*>(item.w)->setCurrentIndex(item.data); break;
        default: Q_ASSERT(false); break;
        }
        ev->accept();
        ret_val = true;
    } else {
        ev->ignore();
    }
    return ret_val;
}

Код


void CMainWindow::keyPressEvent(QKeyEvent*event)
{
    if(!checkWidgetShortcuts(this,event)) {
        // do something with keyevent if needed
    }
}