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|
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#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"
QT_BEGIN_NAMESPACE
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;
bool overCheckBox;
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) && (d->hover || d->overCheckBox))
option->state |= QStyle::State_Sunken;
}
if (!option->palette.isBrushSet(isEnabled() ? QPalette::Active :
QPalette::Disabled, QPalette::WindowText))
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:
\snippet examples/widgets/groupbox/window.cpp 2
\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;
overCheckBox = 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.
\snippet doc/src/snippets/code/src_gui_widgets_qgroupbox.cpp 0
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);
}
/*! \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);
d->pressedControl = QStyle::SC_None;
if (toggle)
d->click();
return true;
}
break;
}
default:
break;
}
return QWidget::event(e);
}
/*!\reimp */
void QGroupBox::childEvent(QChildEvent *c)
{
Q_D(QGroupBox);
if (c->type() != QEvent::ChildAdded || !c->child()->isWidgetType())
return;
QWidget *w = (QWidget*)c->child();
if (d->checkable) {
if (d->checked) {
if (!w->testAttribute(Qt::WA_ForceDisabled))
w->setEnabled(true);
} else {
if (w->isEnabled()) {
w->setEnabled(false);
w->setAttribute(Qt::WA_ForceDisabled, false);
}
}
}
}
/*!
\internal
This private slot finds a widget in this group box that can accept
focus, and gives the focus to that widget.
*/
void QGroupBoxPrivate::_q_fixFocus(Qt::FocusReason reason)
{
Q_Q(QGroupBox);
QWidget *fw = q->focusWidget();
if (!fw || fw == q) {
QWidget * best = 0;
QWidget * candidate = 0;
QWidget * w = q;
while ((w = w->nextInFocusChain()) != q) {
if (q->isAncestorOf(w) && (w->focusPolicy() & Qt::TabFocus) == Qt::TabFocus && w->isVisibleTo(q)) {
if (!best && qobject_cast<QRadioButton*>(w) && ((QRadioButton*)w)->isChecked())
// we prefer a checked radio button or a widget that
// already has focus, if there is one
best = w;
else
if (!candidate)
// but we'll accept anything that takes focus
candidate = w;
}
}
if (best)
fw = best;
else if (candidate)
fw = candidate;
}
if (fw)
fw->setFocus(reason);
}
/*
Sets the right frame rect depending on the title.
*/
void QGroupBoxPrivate::calculateFrame()
{
Q_Q(QGroupBox);
QStyleOptionGroupBox box;
q->initStyleOption(&box);
QRect contentsRect = q->style()->subControlRect(QStyle::CC_GroupBox, &box, QStyle::SC_GroupBoxContents, q);
q->setContentsMargins(contentsRect.left() - box.rect.left(), contentsRect.top() - box.rect.top(),
box.rect.right() - contentsRect.right(), box.rect.bottom() - contentsRect.bottom());
setLayoutItemMargins(QStyle::SE_GroupBoxLayoutItem, &box);
}
/*! \reimp
*/
void QGroupBox::focusInEvent(QFocusEvent *fe)
{ // note no call to super
Q_D(QGroupBox);
if (focusPolicy() == Qt::NoFocus) {
d->_q_fixFocus(fe->reason());
} else {
QWidget::focusInEvent(fe);
}
}
/*!
\reimp
*/
QSize QGroupBox::minimumSizeHint() const
{
Q_D(const QGroupBox);
QStyleOptionGroupBox option;
initStyleOption(&option);
QFontMetrics metrics(fontMetrics());
int baseWidth = metrics.width(d->title) + metrics.width(QLatin1Char(' '));
int baseHeight = metrics.height();
if (d->checkable) {
baseWidth += style()->pixelMetric(QStyle::PM_IndicatorWidth);
baseWidth += style()->pixelMetric(QStyle::PM_CheckBoxLabelSpacing);
baseHeight = qMax(baseHeight, style()->pixelMetric(QStyle::PM_IndicatorHeight));
}
QSize size = style()->sizeFromContents(QStyle::CT_GroupBox, &option, QSize(baseWidth, baseHeight), this);
return size.expandedTo(QWidget::minimumSizeHint());
}
/*!
\property QGroupBox::flat
\brief whether the group box is painted flat or has a frame
A group box usually consists of a surrounding frame with a title
at the top. If this property is enabled, only the top part of the frame is
drawn in most styles; otherwise the whole frame is drawn.
By default, this property is disabled; i.e. group boxes are not flat unless
explicitly specified.
\bold{Note:} In some styles, flat and non-flat group boxes have similar
representations and may not be as distinguishable as they are in other
styles.
\sa title
*/
bool QGroupBox::isFlat() const
{
Q_D(const QGroupBox);
return d->flat;
}
void QGroupBox::setFlat(bool b)
{
Q_D(QGroupBox);
if (d->flat == b)
return;
d->flat = b;
updateGeometry();
update();
}
/*!
\property QGroupBox::checkable
\brief whether the group box has a checkbox in its title
If this property is true, the group box displays its title using
a checkbox in place of an ordinary label. If the checkbox is checked,
the group box's children are enabled; otherwise they are disabled and
inaccessible.
By default, group boxes are not checkable.
If this property is enabled for a group box, it will also be initially
checked to ensure that its contents are enabled.
\sa checked
*/
void QGroupBox::setCheckable(bool checkable)
{
Q_D(QGroupBox);
bool wasCheckable = d->checkable;
d->checkable = checkable;
if (checkable) {
setChecked(true);
if (!wasCheckable) {
setFocusPolicy(Qt::StrongFocus);
d->_q_setChildrenEnabled(true);
updateGeometry();
}
} else {
if (wasCheckable) {
setFocusPolicy(Qt::NoFocus);
d->_q_setChildrenEnabled(true);
updateGeometry();
}
d->_q_setChildrenEnabled(true);
}
if (wasCheckable != checkable) {
d->calculateFrame();
update();
}
}
bool QGroupBox::isCheckable() const
{
Q_D(const QGroupBox);
return d->checkable;
}
bool QGroupBox::isChecked() const
{
Q_D(const QGroupBox);
return d->checkable && d->checked;
}
/*!
\fn void QGroupBox::toggled(bool on)
If the group box is checkable, this signal is emitted when the check box
is toggled. \a on is true if the check box is checked; otherwise it is false.
\sa checkable
*/
/*!
\fn void QGroupBox::clicked(bool checked)
\since 4.2
This signal is emitted when the check box is activated (i.e. pressed down
then released while the mouse cursor is inside the button), or when the
shortcut key is typed, Notably, this signal is \e not emitted if you call
setChecked().
If the check box is checked \a checked is true; it is false if the check
box is unchecked.
\sa checkable, toggled(), checked
*/
/*!
\property QGroupBox::checked
\brief whether the group box is checked
If the group box is checkable, it is displayed with a check box.
If the check box is checked, the group box's children are enabled;
otherwise the children are disabled and are inaccessible to the user.
By default, checkable group boxes are also checked.
\sa checkable
*/
void QGroupBox::setChecked(bool b)
{
Q_D(QGroupBox);
if (d->checkable && b != d->checked) {
update();
d->checked = b;
d->_q_setChildrenEnabled(b);
emit toggled(b);
}
}
/*
sets all children of the group box except the qt_groupbox_checkbox
to either disabled/enabled
*/
void QGroupBoxPrivate::_q_setChildrenEnabled(bool b)
{
Q_Q(QGroupBox);
QObjectList childList = q->children();
for (int i = 0; i < childList.size(); ++i) {
QObject *o = childList.at(i);
if (o->isWidgetType()) {
QWidget *w = static_cast<QWidget *>(o);
if (b) {
if (!w->testAttribute(Qt::WA_ForceDisabled))
w->setEnabled(true);
} else {
if (w->isEnabled()) {
w->setEnabled(false);
w->setAttribute(Qt::WA_ForceDisabled, false);
}
}
}
}
}
/*! \reimp */
void QGroupBox::changeEvent(QEvent *ev)
{
Q_D(QGroupBox);
if (ev->type() == QEvent::EnabledChange) {
if (d->checkable && isEnabled()) {
// we are being enabled - disable children
if (!d->checked)
d->_q_setChildrenEnabled(false);
}
} else if (ev->type() == QEvent::FontChange
#ifdef Q_WS_MAC
|| ev->type() == QEvent::MacSizeChange
#endif
|| ev->type() == QEvent::StyleChange) {
d->calculateFrame();
}
QWidget::changeEvent(ev);
}
/*! \reimp */
void QGroupBox::mousePressEvent(QMouseEvent *event)
{
if (event->button() != Qt::LeftButton) {
event->ignore();
return;
}
Q_D(QGroupBox);
QStyleOptionGroupBox box;
initStyleOption(&box);
d->pressedControl = style()->hitTestComplexControl(QStyle::CC_GroupBox, &box,
event->pos(), this);
if (d->checkable && (d->pressedControl & (QStyle::SC_GroupBoxCheckBox | QStyle::SC_GroupBoxLabel))) {
d->overCheckBox = true;
update(style()->subControlRect(QStyle::CC_GroupBox, &box, QStyle::SC_GroupBoxCheckBox, this));
}
}
/*! \reimp */
void QGroupBox::mouseMoveEvent(QMouseEvent *event)
{
Q_D(QGroupBox);
QStyleOptionGroupBox box;
initStyleOption(&box);
QStyle::SubControl pressed = style()->hitTestComplexControl(QStyle::CC_GroupBox, &box,
event->pos(), this);
bool oldOverCheckBox = d->overCheckBox;
d->overCheckBox = (pressed == QStyle::SC_GroupBoxCheckBox || pressed == QStyle::SC_GroupBoxLabel);
if (d->checkable && (d->pressedControl == QStyle::SC_GroupBoxCheckBox || d->pressedControl == QStyle::SC_GroupBoxLabel)
&& (d->overCheckBox != oldOverCheckBox))
update(style()->subControlRect(QStyle::CC_GroupBox, &box, QStyle::SC_GroupBoxCheckBox, this));
}
/*! \reimp */
void QGroupBox::mouseReleaseEvent(QMouseEvent *event)
{
if (event->button() != Qt::LeftButton) {
event->ignore();
return;
}
Q_D(QGroupBox);
QStyleOptionGroupBox box;
initStyleOption(&box);
QStyle::SubControl released = style()->hitTestComplexControl(QStyle::CC_GroupBox, &box,
event->pos(), this);
bool toggle = d->checkable && (released == QStyle::SC_GroupBoxLabel
|| released == QStyle::SC_GroupBoxCheckBox);
d->pressedControl = QStyle::SC_None;
d->overCheckBox = false;
if (toggle)
d->click();
else if (d->checkable)
update(style()->subControlRect(QStyle::CC_GroupBox, &box, QStyle::SC_GroupBoxCheckBox, this));
}
#ifdef QT3_SUPPORT
/*!
Use one of the constructors that doesn't take the \a name
argument and then use setObjectName() instead.
*/
QGroupBox::QGroupBox(QWidget *parent, const char *name)
: QWidget(*new QGroupBoxPrivate, parent, 0)
{
Q_D(QGroupBox);
setObjectName(QString::fromAscii(name));
d->init();
}
/*!
Use one of the constructors that doesn't take the \a name
argument and then use setObjectName() instead.
*/
QGroupBox::QGroupBox(const QString &title, QWidget *parent, const char *name)
: QWidget(*new QGroupBoxPrivate, parent, 0)
{
Q_D(QGroupBox);
setObjectName(QString::fromAscii(name));
d->init();
setTitle(title);
}
#endif // QT3_SUPPORT
QT_END_NAMESPACE
#include "moc_qgroupbox.cpp"
#endif //QT_NO_GROUPBOX
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