[2] | 1 | /****************************************************************************
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| 2 | **
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[846] | 3 | ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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[561] | 4 | ** All rights reserved.
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| 5 | ** Contact: Nokia Corporation ([email protected])
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[2] | 6 | **
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| 7 | ** This file is part of the QtGui module of the Qt Toolkit.
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| 8 | **
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| 9 | ** $QT_BEGIN_LICENSE:LGPL$
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| 10 | ** Commercial Usage
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| 11 | ** Licensees holding valid Qt Commercial licenses may use this file in
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| 12 | ** accordance with the Qt Commercial License Agreement provided with the
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| 13 | ** Software or, alternatively, in accordance with the terms contained in
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| 14 | ** a written agreement between you and Nokia.
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| 15 | **
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| 16 | ** GNU Lesser General Public License Usage
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| 17 | ** Alternatively, this file may be used under the terms of the GNU Lesser
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| 18 | ** General Public License version 2.1 as published by the Free Software
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| 19 | ** Foundation and appearing in the file LICENSE.LGPL included in the
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| 20 | ** packaging of this file. Please review the following information to
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| 21 | ** ensure the GNU Lesser General Public License version 2.1 requirements
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| 22 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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| 23 | **
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[561] | 24 | ** In addition, as a special exception, Nokia gives you certain additional
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| 25 | ** rights. These rights are described in the Nokia Qt LGPL Exception
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| 26 | ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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[2] | 27 | **
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| 28 | ** GNU General Public License Usage
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| 29 | ** Alternatively, this file may be used under the terms of the GNU
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| 30 | ** General Public License version 3.0 as published by the Free Software
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| 31 | ** Foundation and appearing in the file LICENSE.GPL included in the
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| 32 | ** packaging of this file. Please review the following information to
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| 33 | ** ensure the GNU General Public License version 3.0 requirements will be
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| 34 | ** met: http://www.gnu.org/copyleft/gpl.html.
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| 35 | **
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[561] | 36 | ** If you have questions regarding the use of this file, please contact
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| 37 | ** Nokia at [email protected].
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[2] | 38 | ** $QT_END_LICENSE$
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| 39 | **
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| 40 | ****************************************************************************/
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| 41 |
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| 42 | #include "qradiobutton.h"
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| 43 | #include "qapplication.h"
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| 44 | #include "qbitmap.h"
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| 45 | #include "qbuttongroup.h"
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| 46 | #include "qstylepainter.h"
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| 47 | #include "qstyle.h"
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| 48 | #include "qstyleoption.h"
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| 49 | #include "qevent.h"
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| 50 |
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| 51 | #include "private/qabstractbutton_p.h"
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| 52 |
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| 53 | QT_BEGIN_NAMESPACE
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| 54 |
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| 55 | class QRadioButtonPrivate : public QAbstractButtonPrivate
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| 56 | {
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| 57 | Q_DECLARE_PUBLIC(QRadioButton)
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| 58 |
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| 59 | public:
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| 60 | QRadioButtonPrivate() : QAbstractButtonPrivate(QSizePolicy::RadioButton), hovering(true) {}
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| 61 | void init();
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| 62 | uint hovering : 1;
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| 63 | };
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| 64 |
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| 65 | /*
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| 66 | Initializes the radio button.
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| 67 | */
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| 68 | void QRadioButtonPrivate::init()
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| 69 | {
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| 70 | Q_Q(QRadioButton);
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| 71 | q->setCheckable(true);
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| 72 | q->setAutoExclusive(true);
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| 73 | q->setMouseTracking(true);
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| 74 | q->setForegroundRole(QPalette::WindowText);
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| 75 | setLayoutItemMargins(QStyle::SE_RadioButtonLayoutItem);
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| 76 | }
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| 77 |
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| 78 | /*!
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| 79 | \class QRadioButton
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| 80 | \brief The QRadioButton widget provides a radio button with a text label.
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| 81 |
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| 82 | \ingroup basicwidgets
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| 83 |
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[561] | 84 |
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[2] | 85 | A QRadioButton is an option button that can be switched on (checked) or
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| 86 | off (unchecked). Radio buttons typically present the user with a "one
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| 87 | of many" choice. In a group of radio buttons only one radio button at
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| 88 | a time can be checked; if the user selects another button, the
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| 89 | previously selected button is switched off.
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| 90 |
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| 91 | Radio buttons are autoExclusive by default. If auto-exclusive is
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| 92 | enabled, radio buttons that belong to the same parent widget
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| 93 | behave as if they were part of the same exclusive button group. If
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| 94 | you need multiple exclusive button groups for radio buttons that
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| 95 | belong to the same parent widget, put them into a QButtonGroup.
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| 96 |
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| 97 | Whenever a button is switched on or off it emits the toggled() signal.
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| 98 | Connect to this signal if you want to trigger an action each time the
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| 99 | button changes state. Use isChecked() to see if a particular button is
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| 100 | selected.
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| 101 |
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| 102 | Just like QPushButton, a radio button displays text, and
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| 103 | optionally a small icon. The icon is set with setIcon(). The text
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| 104 | can be set in the constructor or with setText(). A shortcut key
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| 105 | can be specified by preceding the preferred character with an
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| 106 | ampersand in the text. For example:
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| 107 |
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| 108 | \snippet doc/src/snippets/code/src_gui_widgets_qradiobutton.cpp 0
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| 109 |
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| 110 | In this example the shortcut is \e{Alt+c}. See the \l
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| 111 | {QShortcut#mnemonic}{QShortcut} documentation for details (to
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| 112 | display an actual ampersand, use '&&').
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| 113 |
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| 114 | Important inherited members: text(), setText(), text(),
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| 115 | setDown(), isDown(), autoRepeat(), group(), setAutoRepeat(),
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| 116 | toggle(), pressed(), released(), clicked(), and toggled().
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| 117 |
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| 118 | \table 100%
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| 119 | \row \o \inlineimage plastique-radiobutton.png Screenshot of a Plastique radio button
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| 120 | \o A radio button shown in the \l{Plastique Style Widget Gallery}{Plastique widget style}.
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| 121 | \row \o \inlineimage windows-radiobutton.png Screenshot of a Windows XP radio button
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| 122 | \o A radio button shown in the \l{Windows XP Style Widget Gallery}{Windows XP widget style}.
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| 123 | \row \o \inlineimage macintosh-radiobutton.png Screenshot of a Macintosh radio button
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| 124 | \o A radio button shown in the \l{Macintosh Style Widget Gallery}{Macintosh widget style}.
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| 125 | \endtable
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| 126 |
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| 127 | \sa QPushButton, QToolButton, QCheckBox, {fowler}{GUI Design Handbook: Radio Button},
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| 128 | {Group Box Example}
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| 129 | */
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| 130 |
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| 131 |
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| 132 | /*!
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| 133 | Constructs a radio button with the given \a parent, but with no text or
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| 134 | pixmap.
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| 135 |
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| 136 | The \a parent argument is passed on to the QAbstractButton constructor.
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| 137 | */
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| 138 |
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| 139 | QRadioButton::QRadioButton(QWidget *parent)
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| 140 | : QAbstractButton(*new QRadioButtonPrivate, parent)
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| 141 | {
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| 142 | Q_D(QRadioButton);
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| 143 | d->init();
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| 144 | }
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| 145 |
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| 146 | /*!
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| 147 | Constructs a radio button with the given \a parent and a \a text string.
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| 148 |
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| 149 | The \a parent argument is passed on to the QAbstractButton constructor.
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| 150 | */
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| 151 |
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| 152 | QRadioButton::QRadioButton(const QString &text, QWidget *parent)
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| 153 | : QAbstractButton(*new QRadioButtonPrivate, parent)
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| 154 | {
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| 155 | Q_D(QRadioButton);
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| 156 | d->init();
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| 157 | setText(text);
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| 158 | }
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| 159 |
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| 160 | /*!
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| 161 | Initialize \a option with the values from this QRadioButton. This method is useful
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| 162 | for subclasses when they need a QStyleOptionButton, but don't want to fill
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| 163 | in all the information themselves.
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| 164 |
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| 165 | \sa QStyleOption::initFrom()
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| 166 | */
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| 167 | void QRadioButton::initStyleOption(QStyleOptionButton *option) const
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| 168 | {
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| 169 | if (!option)
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| 170 | return;
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| 171 | Q_D(const QRadioButton);
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| 172 | option->initFrom(this);
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| 173 | option->text = d->text;
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| 174 | option->icon = d->icon;
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| 175 | option->iconSize = iconSize();
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| 176 | if (d->down)
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| 177 | option->state |= QStyle::State_Sunken;
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| 178 | option->state |= (d->checked) ? QStyle::State_On : QStyle::State_Off;
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| 179 | if (testAttribute(Qt::WA_Hover) && underMouse()) {
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| 180 | if (d->hovering)
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| 181 | option->state |= QStyle::State_MouseOver;
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| 182 | else
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| 183 | option->state &= ~QStyle::State_MouseOver;
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| 184 | }
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| 185 | }
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| 186 |
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| 187 | /*!
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| 188 | \reimp
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| 189 | */
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| 190 | QSize QRadioButton::sizeHint() const
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| 191 | {
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| 192 | Q_D(const QRadioButton);
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| 193 | if (d->sizeHint.isValid())
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| 194 | return d->sizeHint;
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| 195 | ensurePolished();
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| 196 | QStyleOptionButton opt;
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| 197 | initStyleOption(&opt);
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[846] | 198 | QSize sz = style()->itemTextRect(fontMetrics(), QRect(), Qt::TextShowMnemonic,
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[2] | 199 | false, text()).size();
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| 200 | if (!opt.icon.isNull())
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| 201 | sz = QSize(sz.width() + opt.iconSize.width() + 4, qMax(sz.height(), opt.iconSize.height()));
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| 202 | d->sizeHint = (style()->sizeFromContents(QStyle::CT_RadioButton, &opt, sz, this).
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| 203 | expandedTo(QApplication::globalStrut()));
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| 204 | return d->sizeHint;
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| 205 | }
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| 206 |
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| 207 | /*!
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| 208 | \reimp
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| 209 | */
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| 210 | bool QRadioButton::hitButton(const QPoint &pos) const
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| 211 | {
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| 212 | QStyleOptionButton opt;
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| 213 | initStyleOption(&opt);
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| 214 | return style()->subElementRect(QStyle::SE_RadioButtonClickRect, &opt, this).contains(pos);
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| 215 | }
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| 216 |
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| 217 | /*!
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| 218 | \reimp
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| 219 | */
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| 220 | void QRadioButton::mouseMoveEvent(QMouseEvent *e)
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| 221 | {
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| 222 | Q_D(QRadioButton);
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| 223 | if (testAttribute(Qt::WA_Hover)) {
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| 224 | bool hit = false;
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| 225 | if (underMouse())
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| 226 | hit = hitButton(e->pos());
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| 227 |
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| 228 | if (hit != d->hovering) {
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| 229 | update();
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| 230 | d->hovering = hit;
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| 231 | }
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| 232 | }
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| 233 |
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| 234 | QAbstractButton::mouseMoveEvent(e);
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| 235 | }
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| 236 |
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| 237 | /*!\reimp
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| 238 | */
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| 239 | void QRadioButton::paintEvent(QPaintEvent *)
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| 240 | {
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| 241 | QStylePainter p(this);
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| 242 | QStyleOptionButton opt;
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| 243 | initStyleOption(&opt);
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| 244 | p.drawControl(QStyle::CE_RadioButton, opt);
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| 245 | }
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| 246 |
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| 247 | /*! \reimp */
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| 248 | bool QRadioButton::event(QEvent *e)
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| 249 | {
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| 250 | Q_D(QRadioButton);
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| 251 | if (e->type() == QEvent::StyleChange
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| 252 | #ifdef Q_WS_MAC
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| 253 | || e->type() == QEvent::MacSizeChange
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| 254 | #endif
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| 255 | )
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| 256 | d->setLayoutItemMargins(QStyle::SE_RadioButtonLayoutItem);
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| 257 | return QAbstractButton::event(e);
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| 258 | }
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| 259 |
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| 260 | #ifdef QT3_SUPPORT
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| 261 | /*!
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| 262 | Use one of the constructors that doesn't take the \a name
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| 263 | argument and then use setObjectName() instead.
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| 264 | */
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| 265 | QRadioButton::QRadioButton(QWidget *parent, const char* name)
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| 266 | : QAbstractButton(*new QRadioButtonPrivate, parent)
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| 267 | {
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| 268 | Q_D(QRadioButton);
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| 269 | d->init();
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| 270 | setObjectName(QString::fromAscii(name));
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| 271 | }
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| 272 |
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| 273 | /*!
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| 274 | Use one of the constructors that doesn't take the \a name
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| 275 | argument and then use setObjectName() instead.
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| 276 | */
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| 277 | QRadioButton::QRadioButton(const QString &text, QWidget *parent, const char* name)
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| 278 | : QAbstractButton(*new QRadioButtonPrivate, parent)
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| 279 | {
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| 280 | Q_D(QRadioButton);
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| 281 | d->init();
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| 282 | setObjectName(QString::fromAscii(name));
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| 283 | setText(text);
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| 284 | }
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| 285 |
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| 286 | #endif
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| 287 |
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| 288 | QT_END_NAMESPACE
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