qabstractbutton.cpp

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#include "private/qabstractbutton_p.h"
 
#if QT_CONFIG(itemviews)
#include "qabstractitemview.h"
#endif
#if QT_CONFIG(buttongroup)
#include "qbuttongroup.h"
#include "private/qapplication_p.h"
#include "private/qbuttongroup_p.h"
#endif
#include "qabstractbutton_p.h"
#include "qevent.h"
#include "qpainter.h"
#include "qapplication.h"
#include "qstyle.h"
#ifndef QT_NO_ACCESSIBILITY
#include "qaccessible.h"
#endif
 
#include <algorithm>
 
QT_BEGIN_NAMESPACE
 
#define AUTO_REPEAT_DELAY  300
#define AUTO_REPEAT_INTERVAL 100
 
Q_WIDGETS_EXPORT extern bool qt_tab_all_widgets();
 
QAbstractButtonPrivate::QAbstractButtonPrivate(QSizePolicy::ControlType type)
    :
#ifndef QT_NO_SHORTCUT
    shortcutId(0),
#endif
    checkable(false), checked(false), autoRepeat(false), autoExclusive(false),
    down(false), blockRefresh(false), pressed(false),
#if QT_CONFIG(buttongroup)
    group(nullptr),
#endif
    autoRepeatDelay(AUTO_REPEAT_DELAY),
    autoRepeatInterval(AUTO_REPEAT_INTERVAL),
    controlType(type)
{}
 
QList<QAbstractButton *>QAbstractButtonPrivate::queryButtonList() const
{
#if QT_CONFIG(buttongroup)
    if (group)
        return group->d_func()->buttonList;
#endif
 
    if (!parent)
        return {};
    QList<QAbstractButton *> candidates = parent->findChildren<QAbstractButton *>();
    if (autoExclusive) {
        auto isNoMemberOfMyAutoExclusiveGroup = [](QAbstractButton *candidate) {
            return !candidate->autoExclusive()
#if QT_CONFIG(buttongroup)
                || candidate->group()
#endif
                ;
        };
        candidates.removeIf(isNoMemberOfMyAutoExclusiveGroup);
    }
    return candidates;
}
 
QAbstractButton *QAbstractButtonPrivate::queryCheckedButton() const
{
#if QT_CONFIG(buttongroup)
    if (group)
        return group->d_func()->checkedButton;
#endif
 
    Q_Q(const QAbstractButton);
    QList<QAbstractButton *> buttonList = queryButtonList();
    if (!autoExclusive || buttonList.count() == 1) // no group
        return nullptr;
 
    for (int i = 0; i < buttonList.count(); ++i) {
        QAbstractButton *b = buttonList.at(i);
        if (b->d_func()->checked && b != q)
            return b;
    }
    return checked  ? const_cast<QAbstractButton *>(q) : nullptr;
}
 
void QAbstractButtonPrivate::notifyChecked()
{
#if QT_CONFIG(buttongroup)
    Q_Q(QAbstractButton);
    if (group) {
        QAbstractButton *previous = group->d_func()->checkedButton;
        group->d_func()->checkedButton = q;
        if (group->d_func()->exclusive && previous && previous != q)
            previous->nextCheckState();
    } else
#endif
    if (autoExclusive) {
        if (QAbstractButton *b = queryCheckedButton())
            b->setChecked(false);
    }
}
 
void QAbstractButtonPrivate::moveFocus(int key)
{
    QList<QAbstractButton *> buttonList = queryButtonList();
#if QT_CONFIG(buttongroup)
    bool exclusive = group ? group->d_func()->exclusive : autoExclusive;
#else
    bool exclusive = autoExclusive;
#endif
    QWidget *f = QApplication::focusWidget();
    QAbstractButton *fb = qobject_cast<QAbstractButton *>(f);
    if (!fb || !buttonList.contains(fb))
        return;
 
    QAbstractButton *candidate = nullptr;
    int bestScore = -1;
    QRect target = f->rect().translated(f->mapToGlobal(QPoint(0,0)));
    QPoint goal = target.center();
    uint focus_flag = qt_tab_all_widgets() ? Qt::TabFocus : Qt::StrongFocus;
 
    for (int i = 0; i < buttonList.count(); ++i) {
        QAbstractButton *button = buttonList.at(i);
        if (button != f && button->window() == f->window() && button->isEnabled() && !button->isHidden() &&
            (exclusive || (button->focusPolicy() & focus_flag) == focus_flag)) {
            QRect buttonRect = button->rect().translated(button->mapToGlobal(QPoint(0,0)));
            QPoint p = buttonRect.center();
 
            //Priority to widgets that overlap on the same coordinate.
            //In that case, the distance in the direction will be used as significant score,
            //take also in account orthogonal distance in case two widget are in the same distance.
            int score;
            if ((buttonRect.x() < target.right() && target.x() < buttonRect.right())
                  && (key == Qt::Key_Up || key == Qt::Key_Down)) {
                //one item's is at the vertical of the other
                score = (qAbs(p.y() - goal.y()) << 16) + qAbs(p.x() - goal.x());
            } else if ((buttonRect.y() < target.bottom() && target.y() < buttonRect.bottom())
                        && (key == Qt::Key_Left || key == Qt::Key_Right) ) {
                //one item's is at the horizontal of the other
                score = (qAbs(p.x() - goal.x()) << 16) + qAbs(p.y() - goal.y());
            } else {
                score = (1 << 30) + (p.y() - goal.y()) * (p.y() - goal.y()) + (p.x() - goal.x()) * (p.x() - goal.x());
            }
 
            if (score > bestScore && candidate)
                continue;
 
            switch(key) {
            case Qt::Key_Up:
                if (p.y() < goal.y()) {
                    candidate = button;
                    bestScore = score;
                }
                break;
            case Qt::Key_Down:
                if (p.y() > goal.y()) {
                    candidate = button;
                    bestScore = score;
                }
                break;
            case Qt::Key_Left:
                if (p.x() < goal.x()) {
                    candidate = button;
                    bestScore = score;
                }
                break;
            case Qt::Key_Right:
                if (p.x() > goal.x()) {
                    candidate = button;
                    bestScore = score;
                }
                break;
            }
        }
    }
 
    if (exclusive
#ifdef QT_KEYPAD_NAVIGATION
        && !QApplicationPrivate::keypadNavigationEnabled()
#endif
        && candidate
        && fb->d_func()->checked
        && candidate->d_func()->checkable)
        candidate->click();
 
    if (candidate) {
        if (key == Qt::Key_Up || key == Qt::Key_Left)
            candidate->setFocus(Qt::BacktabFocusReason);
        else
            candidate->setFocus(Qt::TabFocusReason);
    }
}
 
void QAbstractButtonPrivate::fixFocusPolicy()
{
    Q_Q(QAbstractButton);
#if QT_CONFIG(buttongroup)
    if (!group && !autoExclusive)
#else
    if (!autoExclusive)
#endif
        return;
 
    QList<QAbstractButton *> buttonList = queryButtonList();
    for (int i = 0; i < buttonList.count(); ++i) {
        QAbstractButton *b = buttonList.at(i);
        if (!b->isCheckable())
            continue;
        b->setFocusPolicy((Qt::FocusPolicy) ((b == q || !q->isCheckable())
                                         ? (b->focusPolicy() | Qt::TabFocus)
                                         :  (b->focusPolicy() & ~Qt::TabFocus)));
    }
}
 
void QAbstractButtonPrivate::init()
{
    Q_Q(QAbstractButton);
 
    q->setFocusPolicy(Qt::FocusPolicy(q->style()->styleHint(QStyle::SH_Button_FocusPolicy)));
    q->setSizePolicy(QSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed, controlType));
    q->setAttribute(Qt::WA_WState_OwnSizePolicy, false);
    q->setForegroundRole(QPalette::ButtonText);
    q->setBackgroundRole(QPalette::Button);
}
 
void QAbstractButtonPrivate::refresh()
{
    Q_Q(QAbstractButton);
 
    if (blockRefresh)
        return;
    q->update();
}
 
void QAbstractButtonPrivate::click()
{
    Q_Q(QAbstractButton);
 
    down = false;
    blockRefresh = true;
    bool changeState = true;
    if (checked && queryCheckedButton() == q) {
        // the checked button of an exclusive or autoexclusive group cannot be unchecked
#if QT_CONFIG(buttongroup)
        if (group ? group->d_func()->exclusive : autoExclusive)
#else
        if (autoExclusive)
#endif
            changeState = false;
    }
 
    QPointer<QAbstractButton> guard(q);
    if (changeState) {
        q->nextCheckState();
        if (!guard)
            return;
    }
    blockRefresh = false;
    refresh();
    q->repaint();
    if (guard)
        emitReleased();
    if (guard)
        emitClicked();
}
 
void QAbstractButtonPrivate::emitClicked()
{
    Q_Q(QAbstractButton);
    QPointer<QAbstractButton> guard(q);
    emit q->clicked(checked);
#if QT_CONFIG(buttongroup)
    if (guard && group) {
        emit group->idClicked(group->id(q));
        if (guard && group)
            emit group->buttonClicked(q);
    }
#endif
}
 
void QAbstractButtonPrivate::emitPressed()
{
    Q_Q(QAbstractButton);
    QPointer<QAbstractButton> guard(q);
    emit q->pressed();
#if QT_CONFIG(buttongroup)
    if (guard && group) {
        emit group->idPressed(group->id(q));
        if (guard && group)
            emit group->buttonPressed(q);
    }
#endif
}
 
void QAbstractButtonPrivate::emitReleased()
{
    Q_Q(QAbstractButton);
    QPointer<QAbstractButton> guard(q);
    emit q->released();
#if QT_CONFIG(buttongroup)
    if (guard && group) {
        emit group->idReleased(group->id(q));
        if (guard && group)
            emit group->buttonReleased(q);
    }
#endif
}
 
void QAbstractButtonPrivate::emitToggled(bool checked)
{
    Q_Q(QAbstractButton);
    QPointer<QAbstractButton> guard(q);
    emit q->toggled(checked);
#if QT_CONFIG(buttongroup)
    if (guard && group) {
        emit group->idToggled(group->id(q), checked);
        if (guard && group)
            emit group->buttonToggled(q, checked);
    }
#endif
}
 
QAbstractButton::QAbstractButton(QWidget *parent)
    : QWidget(*new QAbstractButtonPrivate, parent, { })
{
    Q_D(QAbstractButton);
    d->init();
}
 
 QAbstractButton::~QAbstractButton()
{
#if QT_CONFIG(buttongroup)
    Q_D(QAbstractButton);
    if (d->group)
        d->group->removeButton(this);
#endif
}
 
 
QAbstractButton::QAbstractButton(QAbstractButtonPrivate &dd, QWidget *parent)
    : QWidget(dd, parent, { })
{
    Q_D(QAbstractButton);
    d->init();
}
 
void QAbstractButton::setText(const QString &text)
{
    Q_D(QAbstractButton);
    if (d->text == text)
        return;
    d->text = text;
#ifndef QT_NO_SHORTCUT
    QKeySequence newMnemonic = QKeySequence::mnemonic(text);
    setShortcut(newMnemonic);
#endif
    d->sizeHint = QSize();
    update();
    updateGeometry();
#ifndef QT_NO_ACCESSIBILITY
    QAccessibleEvent event(this, QAccessible::NameChanged);
    QAccessible::updateAccessibility(&event);
#endif
}
 
QString QAbstractButton::text() const
{
    Q_D(const QAbstractButton);
    return d->text;
}
 
 
void QAbstractButton::setIcon(const QIcon &icon)
{
    Q_D(QAbstractButton);
    d->icon = icon;
    d->sizeHint = QSize();
    update();
    updateGeometry();
}
 
QIcon QAbstractButton::icon() const
{
    Q_D(const QAbstractButton);
    return d->icon;
}
 
#ifndef QT_NO_SHORTCUT
void QAbstractButton::setShortcut(const QKeySequence &key)
{
    Q_D(QAbstractButton);
    if (d->shortcutId != 0)
        releaseShortcut(d->shortcutId);
    d->shortcut = key;
    d->shortcutId = grabShortcut(key);
}
 
QKeySequence QAbstractButton::shortcut() const
{
    Q_D(const QAbstractButton);
    return d->shortcut;
}
#endif // QT_NO_SHORTCUT
 
void QAbstractButton::setCheckable(bool checkable)
{
    Q_D(QAbstractButton);
    if (d->checkable == checkable)
        return;
 
    d->checkable = checkable;
    d->checked = false;
}
 
bool QAbstractButton::isCheckable() const
{
    Q_D(const QAbstractButton);
    return d->checkable;
}
 
void QAbstractButton::setChecked(bool checked)
{
    Q_D(QAbstractButton);
    if (!d->checkable || d->checked == checked) {
        if (!d->blockRefresh)
            checkStateSet();
        return;
    }
 
    if (!checked && d->queryCheckedButton() == this) {
        // the checked button of an exclusive or autoexclusive group cannot be  unchecked
#if QT_CONFIG(buttongroup)
        if (d->group ? d->group->d_func()->exclusive : d->autoExclusive)
            return;
        if (d->group)
            d->group->d_func()->detectCheckedButton();
#else
        if (d->autoExclusive)
            return;
#endif
    }
 
    QPointer<QAbstractButton> guard(this);
 
    d->checked = checked;
    if (!d->blockRefresh)
        checkStateSet();
    d->refresh();
 
    if (guard && checked)
        d->notifyChecked();
    if (guard)
        d->emitToggled(checked);
 
 
#ifndef QT_NO_ACCESSIBILITY
    QAccessible::State s;
    s.checked = true;
    QAccessibleStateChangeEvent event(this, s);
    QAccessible::updateAccessibility(&event);
#endif
}
 
bool QAbstractButton::isChecked() const
{
    Q_D(const QAbstractButton);
    return d->checked;
}
 
void QAbstractButton::setDown(bool down)
{
    Q_D(QAbstractButton);
    if (d->down == down)
        return;
    d->down = down;
    d->refresh();
    if (d->autoRepeat && d->down)
        d->repeatTimer.start(d->autoRepeatDelay, this);
    else
        d->repeatTimer.stop();
}
 
bool QAbstractButton::isDown() const
{
    Q_D(const QAbstractButton);
    return d->down;
}
 
void QAbstractButton::setAutoRepeat(bool autoRepeat)
{
    Q_D(QAbstractButton);
    if (d->autoRepeat == autoRepeat)
        return;
    d->autoRepeat = autoRepeat;
    if (d->autoRepeat && d->down)
        d->repeatTimer.start(d->autoRepeatDelay, this);
    else
        d->repeatTimer.stop();
}
 
bool QAbstractButton::autoRepeat() const
{
    Q_D(const QAbstractButton);
    return d->autoRepeat;
}
 
void QAbstractButton::setAutoRepeatDelay(int autoRepeatDelay)
{
    Q_D(QAbstractButton);
    d->autoRepeatDelay = autoRepeatDelay;
}
 
int QAbstractButton::autoRepeatDelay() const
{
    Q_D(const QAbstractButton);
    return d->autoRepeatDelay;
}
 
void QAbstractButton::setAutoRepeatInterval(int autoRepeatInterval)
{
    Q_D(QAbstractButton);
    d->autoRepeatInterval = autoRepeatInterval;
}
 
int QAbstractButton::autoRepeatInterval() const
{
    Q_D(const QAbstractButton);
    return d->autoRepeatInterval;
}
 
 
 
void QAbstractButton::setAutoExclusive(bool autoExclusive)
{
    Q_D(QAbstractButton);
    d->autoExclusive = autoExclusive;
}
 
bool QAbstractButton::autoExclusive() const
{
    Q_D(const QAbstractButton);
    return d->autoExclusive;
}
 
#if QT_CONFIG(buttongroup)
QButtonGroup *QAbstractButton::group() const
{
    Q_D(const QAbstractButton);
    return d->group;
}
#endif // QT_CONFIG(buttongroup)
 
void QAbstractButton::animateClick()
{
    if (!isEnabled())
        return;
    Q_D(QAbstractButton);
    if (d->checkable && focusPolicy() & Qt::ClickFocus)
        setFocus();
    setDown(true);
    repaint();
    if (!d->animateTimer.isActive())
        d->emitPressed();
    d->animateTimer.start(100, this);
}
 
void QAbstractButton::click()
{
    if (!isEnabled())
        return;
    Q_D(QAbstractButton);
    QPointer<QAbstractButton> guard(this);
    d->down = true;
    d->emitPressed();
    if (guard) {
        d->down = false;
        nextCheckState();
        if (guard)
            d->emitReleased();
        if (guard)
            d->emitClicked();
    }
}
 
void QAbstractButton::toggle()
{
    Q_D(QAbstractButton);
    setChecked(!d->checked);
}
 
 
void QAbstractButton::checkStateSet()
{
}
 
void QAbstractButton::nextCheckState()
{
    if (isCheckable())
        setChecked(!isChecked());
}
 
bool QAbstractButton::hitButton(const QPoint &pos) const
{
    return rect().contains(pos);
}
 
bool QAbstractButton::event(QEvent *e)
{
    // as opposed to other widgets, disabled buttons accept mouse
    // events. This avoids surprising click-through scenarios
    if (!isEnabled()) {
        switch(e->type()) {
        case QEvent::TabletPress:
        case QEvent::TabletRelease:
        case QEvent::TabletMove:
        case QEvent::MouseButtonPress:
        case QEvent::MouseButtonRelease:
        case QEvent::MouseButtonDblClick:
        case QEvent::MouseMove:
        case QEvent::HoverMove:
        case QEvent::HoverEnter:
        case QEvent::HoverLeave:
        case QEvent::ContextMenu:
#if QT_CONFIG(wheelevent)
        case QEvent::Wheel:
#endif
            return true;
        default:
            break;
        }
    }
 
#ifndef QT_NO_SHORTCUT
    if (e->type() == QEvent::Shortcut) {
        Q_D(QAbstractButton);
        QShortcutEvent *se = static_cast<QShortcutEvent *>(e);
        if (d->shortcutId != se->shortcutId())
            return false;
        if (!se->isAmbiguous()) {
            if (!d->animateTimer.isActive())
                animateClick();
        } else {
            if (focusPolicy() != Qt::NoFocus)
                setFocus(Qt::ShortcutFocusReason);
            window()->setAttribute(Qt::WA_KeyboardFocusChange);
        }
        return true;
    }
#endif
    return QWidget::event(e);
}
 
void QAbstractButton::mousePressEvent(QMouseEvent *e)
{
    Q_D(QAbstractButton);
    if (e->button() != Qt::LeftButton) {
        e->ignore();
        return;
    }
    if (hitButton(e->position().toPoint())) {
        setDown(true);
        d->pressed = true;
        repaint();
        d->emitPressed();
        e->accept();
    } else {
        e->ignore();
    }
}
 
void QAbstractButton::mouseReleaseEvent(QMouseEvent *e)
{
    Q_D(QAbstractButton);
 
    if (e->button() != Qt::LeftButton) {
        e->ignore();
        return;
    }
 
    d->pressed = false;
 
    if (!d->down) {
        // refresh is required by QMacStyle to resume the default button animation
        d->refresh();
        e->ignore();
        return;
    }
 
    if (hitButton(e->position().toPoint())) {
        d->repeatTimer.stop();
        d->click();
        e->accept();
    } else {
        setDown(false);
        e->ignore();
    }
}
 
void QAbstractButton::mouseMoveEvent(QMouseEvent *e)
{
    Q_D(QAbstractButton);
    if (!(e->buttons() & Qt::LeftButton) || !d->pressed) {
        e->ignore();
        return;
    }
 
    if (hitButton(e->position().toPoint()) != d->down) {
        setDown(!d->down);
        repaint();
        if (d->down)
            d->emitPressed();
        else
            d->emitReleased();
        e->accept();
    } else if (!hitButton(e->position().toPoint())) {
        e->ignore();
    }
}
 
void QAbstractButton::keyPressEvent(QKeyEvent *e)
{
    Q_D(QAbstractButton);
    bool next = true;
    switch (e->key()) {
    case Qt::Key_Enter:
    case Qt::Key_Return:
        e->ignore();
        break;
    case Qt::Key_Select:
    case Qt::Key_Space:
        if (!e->isAutoRepeat()) {
            setDown(true);
            repaint();
            d->emitPressed();
        }
        break;
    case Qt::Key_Up:
        next = false;
        Q_FALLTHROUGH();
    case Qt::Key_Left:
    case Qt::Key_Right:
    case Qt::Key_Down: {
#ifdef QT_KEYPAD_NAVIGATION
        if ((QApplicationPrivate::keypadNavigationEnabled()
                && (e->key() == Qt::Key_Left || e->key() == Qt::Key_Right))
                || (!QApplication::navigationMode() == Qt::NavigationModeKeypadDirectional
                || (e->key() == Qt::Key_Up || e->key() == Qt::Key_Down))) {
            e->ignore();
            return;
        }
#endif
        QWidget *pw = parentWidget();
        if (d->autoExclusive
#if QT_CONFIG(buttongroup)
        || d->group
#endif
#if QT_CONFIG(itemviews)
        || (pw && qobject_cast<QAbstractItemView *>(pw->parentWidget()))
#endif
        ) {
            // ### Using qobject_cast to check if the parent is a viewport of
            // QAbstractItemView is a crude hack, and should be revisited and
            // cleaned up when fixing task 194373. It's here to ensure that we
            // keep compatibility outside QAbstractItemView.
            d->moveFocus(e->key());
            if (hasFocus()) // nothing happend, propagate
                e->ignore();
        } else {
            // Prefer parent widget, use this if parent is absent
            QWidget *w = pw ? pw : this;
            bool reverse = (w->layoutDirection() == Qt::RightToLeft);
            if ((e->key() == Qt::Key_Left && !reverse)
                || (e->key() == Qt::Key_Right && reverse)) {
                next = false;
            }
            focusNextPrevChild(next);
        }
        break;
    }
    default:
#ifndef QT_NO_SHORTCUT
        if (e->matches(QKeySequence::Cancel) && d->down) {
            setDown(false);
            repaint();
            d->emitReleased();
            return;
        }
#endif
        e->ignore();
    }
}
 
void QAbstractButton::keyReleaseEvent(QKeyEvent *e)
{
    Q_D(QAbstractButton);
 
    if (!e->isAutoRepeat())
        d->repeatTimer.stop();
 
    switch (e->key()) {
    case Qt::Key_Select:
    case Qt::Key_Space:
        if (!e->isAutoRepeat() && d->down)
            d->click();
        break;
    default:
        e->ignore();
    }
}
 
void QAbstractButton::timerEvent(QTimerEvent *e)
{
    Q_D(QAbstractButton);
    if (e->timerId() == d->repeatTimer.timerId()) {
        d->repeatTimer.start(d->autoRepeatInterval, this);
        if (d->down) {
            QPointer<QAbstractButton> guard(this);
            nextCheckState();
            if (guard)
                d->emitReleased();
            if (guard)
                d->emitClicked();
            if (guard)
                d->emitPressed();
        }
    } else if (e->timerId() == d->animateTimer.timerId()) {
        d->animateTimer.stop();
        d->click();
    }
}
 
void QAbstractButton::focusInEvent(QFocusEvent *e)
{
    Q_D(QAbstractButton);
#ifdef QT_KEYPAD_NAVIGATION
    if (!QApplicationPrivate::keypadNavigationEnabled())
#endif
    d->fixFocusPolicy();
    QWidget::focusInEvent(e);
}
 
void QAbstractButton::focusOutEvent(QFocusEvent *e)
{
    Q_D(QAbstractButton);
    if (e->reason() != Qt::PopupFocusReason && d->down) {
        d->down = false;
        d->emitReleased();
    }
    QWidget::focusOutEvent(e);
}
 
void QAbstractButton::changeEvent(QEvent *e)
{
    Q_D(QAbstractButton);
    switch (e->type()) {
    case QEvent::EnabledChange:
        if (!isEnabled() && d->down) {
            d->down = false;
            d->emitReleased();
        }
        break;
    default:
        d->sizeHint = QSize();
        break;
    }
    QWidget::changeEvent(e);
}
 
QSize QAbstractButton::iconSize() const
{
    Q_D(const QAbstractButton);
    if (d->iconSize.isValid())
        return d->iconSize;
    int e = style()->pixelMetric(QStyle::PM_ButtonIconSize, nullptr, this);
    return QSize(e, e);
}
 
void QAbstractButton::setIconSize(const QSize &size)
{
    Q_D(QAbstractButton);
    if (d->iconSize == size)
        return;
 
    d->iconSize = size;
    d->sizeHint = QSize();
    updateGeometry();
    if (isVisible()) {
        update();
    }
}
 
 
 
QT_END_NAMESPACE
 
#include "moc_qabstractbutton.cpp"