qgroupbox.cpp

奇趣公司比较新的qt/emd版本

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#include "qgroupbox.h"
#ifndef QT_NO_GROUPBOX
#include "qapplication.h"
#include "qbitmap.h"
#include "qdrawutil.h"
#include "qevent.h"
#include "qlayout.h"
#include "qradiobutton.h"
#include "qstyle.h"
#include "qstyleoption.h"
#include "qstylepainter.h"
#ifndef QT_NO_ACCESSIBILITY
#include "qaccessible.h"
#endif
#include <private/qwidget_p.h>

#include "qdebug.h"

class QGroupBoxPrivate : public QWidgetPrivate
{
    Q_DECLARE_PUBLIC(QGroupBox)

public:
    void skip();
    void init();
    void calculateFrame();
    QString title;
    int align;
#ifndef QT_NO_SHORTCUT
    int shortcutId;
#endif

    void _q_fixFocus(Qt::FocusReason reason);
    void _q_setChildrenEnabled(bool b);
    void click();
    bool flat;
    bool checkable;
    bool checked;
    bool hover;
    QStyle::SubControl pressedControl;
};

/*!
    Initialize \a option with the values from this QGroupBox. This method
    is useful for subclasses when they need a QStyleOptionGroupBox, but don't want
    to fill in all the information themselves.

    \sa QStyleOption::initFrom()
*/
void QGroupBox::initStyleOption(QStyleOptionGroupBox *option) const
{
    if (!option)
        return;

    Q_D(const QGroupBox);
    option->initFrom(this);
    option->text = d->title;
    option->lineWidth = 1;
    option->midLineWidth = 0;
    option->textAlignment = Qt::Alignment(d->align);
    option->activeSubControls |= d->pressedControl;
    option->subControls = QStyle::SC_GroupBoxFrame;

    if (d->hover)
        option->state |= QStyle::State_MouseOver;
    else
        option->state &= ~QStyle::State_MouseOver;

    if (d->flat)
        option->features |= QStyleOptionFrameV2::Flat;

    if (d->checkable) {
        option->subControls |= QStyle::SC_GroupBoxCheckBox;
        option->state |= (d->checked ? QStyle::State_On : QStyle::State_Off);
        if (d->pressedControl == QStyle::SC_GroupBoxCheckBox
                || d->pressedControl == QStyle::SC_GroupBoxLabel)
            option->state |= QStyle::State_Sunken;
    }

    if (!testAttribute(Qt::WA_SetPalette))
        option->textColor = QColor(style()->styleHint(QStyle::SH_GroupBox_TextLabelColor,
                                   option, this));

    if (!d->title.isEmpty())
        option->subControls |= QStyle::SC_GroupBoxLabel;
}

void QGroupBoxPrivate::click()
{
    Q_Q(QGroupBox);

    QPointer<QGroupBox> guard(q);
    q->setChecked(!checked);
    if (!guard)
        return;
    emit q->clicked(checked);
}

/*!
    \class QGroupBox
    \brief The QGroupBox widget provides a group box frame with a title.

    \ingroup organizers
    \ingroup geomanagement
    \ingroup appearance
    \mainclass

    A group box provides a frame, a title and a keyboard shortcut, and
    displays various other widgets inside itself. The title is on top,
    the keyboard shortcut moves keyboard focus to one of the group
    box's child widgets.

    QGroupBox also lets you set the \l title (normally set in the
    constructor) and the title's \l alignment. Group boxes can be
    \l checkable; child widgets in checkable group boxes are enabled or
    disabled depending on whether or not the group box is \l checked.

    You can minimize the space consumption of a group box by enabling
    the \l flat property. In most \l{QStyle}{styles}, enabling this
    property results in the removal of the left, right and bottom
    edges of the frame.

    QGroupBox doesn't automatically lay out the child widgets (which
    are often \l{QCheckBox}es or \l{QRadioButton}s but can be any
    widgets). The following example shows how we can set up a
    QGroupBox with a layout:

    \quotefromfile widgets/groupbox/window.cpp
    \skipto = new QGroupBox
    \printuntil setLayout(

    \table 100%
    \row \o \inlineimage windowsxp-groupbox.png Screenshot of a Windows XP style group box
         \o \inlineimage macintosh-groupbox.png Screenshot of a Macintosh style group box
         \o \inlineimage plastique-groupbox.png Screenshot of a Plastique style group box
    \row \o A \l{Windows XP Style Widget Gallery}{Windows XP style} group box.
         \o A \l{Macintosh Style Widget Gallery}{Macintosh style} group box.
         \o A \l{Plastique Style Widget Gallery}{Plastique style} group box.
    \endtable

    \sa QButtonGroup, {Group Box Example}
*/



/*!
    Constructs a group box widget with the given \a parent but with no title.
*/

QGroupBox::QGroupBox(QWidget *parent)
    : QWidget(*new QGroupBoxPrivate, parent, 0)
{
    Q_D(QGroupBox);
    d->init();
}

/*!
    Constructs a group box with the given \a title and \a parent.
*/

QGroupBox::QGroupBox(const QString &title, QWidget *parent)
    : QWidget(*new QGroupBoxPrivate, parent, 0)
{
    Q_D(QGroupBox);
    d->init();
    setTitle(title);
}


/*!
    Destroys the group box.
*/
QGroupBox::~QGroupBox()
{
}

void QGroupBoxPrivate::init()
{
    Q_Q(QGroupBox);
    align = Qt::AlignLeft;
#ifndef QT_NO_SHORTCUT
    shortcutId = 0;
#endif
    flat = false;
    checkable = false;
    checked = true;
    hover = false;
    pressedControl = QStyle::SC_None;
    calculateFrame();
    q->setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred, 
                     QSizePolicy::GroupBox));
}

void QGroupBox::setTitle(const QString &title)
{
    Q_D(QGroupBox);
    if (d->title == title)                                // no change
        return;
    d->title = title;
#ifndef QT_NO_SHORTCUT
    releaseShortcut(d->shortcutId);
    d->shortcutId = grabShortcut(QKeySequence::mnemonic(title));
#endif
    d->calculateFrame();

    update();
    updateGeometry();
#ifndef QT_NO_ACCESSIBILITY
    QAccessible::updateAccessibility(this, 0, QAccessible::NameChanged);
#endif
}

/*!
    \property QGroupBox::title
    \brief the group box title text

    The group box title text will have a keyboard shortcut if the title
    contains an ampersand ('&') followed by a letter.

    \code
        g->setTitle("&User information");
    \endcode

    In the example above, \key Alt+U moves the keyboard focus to the
    group box. See the \l {QShortcut#mnemonic}{QShortcut}
    documentation for details (to display an actual ampersand, use
    '&&').

    There is no default title text.

    \sa alignment
*/

QString QGroupBox::title() const
{
    Q_D(const QGroupBox);
    return d->title;
}

/*!
    \property QGroupBox::alignment
    \brief the alignment of the group box title.

    Most styles place the title at the top of the frame. The horizontal
    alignment of the title can be specified using single values from
    the following list:

    \list
    \i Qt::AlignLeft aligns the title text with the left-hand side of the group box.
    \i Qt::AlignRight aligns the title text with the right-hand side of the group box.
    \i Qt::AlignHCenter aligns the title text with the horizontal center of the group box.
    \endlist

    The default alignment is Qt::AlignLeft.

    \sa Qt::Alignment
*/
Qt::Alignment QGroupBox::alignment() const
{
    Q_D(const QGroupBox);
    return QFlag(d->align);
}

void QGroupBox::setAlignment(int alignment)
{
    Q_D(QGroupBox);
    d->align = alignment;
    updateGeometry();
    update();
}

/*! \reimp
*/
void QGroupBox::resizeEvent(QResizeEvent *e)
{
    QWidget::resizeEvent(e);
    updateGeometry();
}

/*! \reimp
*/

void QGroupBox::paintEvent(QPaintEvent *)
{
    QStylePainter paint(this);
    QStyleOptionGroupBox option;
    initStyleOption(&option);
    paint.drawComplexControl(QStyle::CC_GroupBox, option);
}

/*! \reimp  */
bool QGroupBox::event(QEvent *e)
{
    Q_D(QGroupBox);
#ifndef QT_NO_SHORTCUT
    if (e->type() == QEvent::Shortcut) {
        QShortcutEvent *se = static_cast<QShortcutEvent *>(e);
        if (se->shortcutId() == d->shortcutId) {
            if (!isCheckable()) {
                d->_q_fixFocus(Qt::ShortcutFocusReason);
            } else {
                d->click();
                setFocus(Qt::ShortcutFocusReason);
            }
            return true;
        }
    }
#endif
    QStyleOptionGroupBox box;
    initStyleOption(&box);
    switch (e->type()) {
    case QEvent::HoverEnter:
    case QEvent::HoverMove: {
        QStyle::SubControl control = style()->hitTestComplexControl(QStyle::CC_GroupBox, &box,
                                                                    static_cast<QHoverEvent *>(e)->pos(),
                                                                    this);
        bool oldHover = d->hover;
        d->hover = d->checkable && (control == QStyle::SC_GroupBoxLabel || control == QStyle::SC_GroupBoxCheckBox);
        if (oldHover != d->hover) {
            QRect rect = style()->subControlRect(QStyle::CC_GroupBox, &box, QStyle::SC_GroupBoxCheckBox, this)
                         | style()->subControlRect(QStyle::CC_GroupBox, &box, QStyle::SC_GroupBoxLabel, this);
            update(rect);
        }
        return true;
    }
    case QEvent::HoverLeave:
        d->hover = false;
        if (d->checkable) {
            QRect rect = style()->subControlRect(QStyle::CC_GroupBox, &box, QStyle::SC_GroupBoxCheckBox, this)
                         | style()->subControlRect(QStyle::CC_GroupBox, &box, QStyle::SC_GroupBoxLabel, this);
            update(rect);
        }
        return true;
    case QEvent::KeyPress: {
        QKeyEvent *k = static_cast<QKeyEvent*>(e);
        if (!k->isAutoRepeat() && (k->key() == Qt::Key_Select || k->key() == Qt::Key_Space)) {
            d->pressedControl = QStyle::SC_GroupBoxCheckBox;
            update(style()->subControlRect(QStyle::CC_GroupBox, &box, QStyle::SC_GroupBoxCheckBox, this));
            return true;
        }
        break;
    }
    case QEvent::KeyRelease: {
        QKeyEvent *k = static_cast<QKeyEvent*>(e);
        if (!k->isAutoRepeat() && (k->key() == Qt::Key_Select || k->key() == Qt::Key_Space)) {
            bool toggle = (d->pressedControl == QStyle::SC_GroupBoxLabel
                           || d->pressedControl == QStyle::SC_GroupBoxCheckBox);