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authorTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-07-10 15:24:15 -0500
committerTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-07-10 15:24:15 -0500
commitbd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch)
tree7a520322212d48ebcb9fbe1087e7fca28b76185c /src/widgets/qpushbutton.cpp
downloadqt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.tar.gz
qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.zip
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+/****************************************************************************
+**
+** Implementation of QPushButton class
+**
+** Created : 940221
+**
+** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
+**
+** This file is part of the widgets module of the Qt GUI Toolkit.
+**
+** This file may be used under the terms of the GNU General
+** Public License versions 2.0 or 3.0 as published by the Free
+** Software Foundation and appearing in the files LICENSE.GPL2
+** and LICENSE.GPL3 included in the packaging of this file.
+** Alternatively you may (at your option) use any later version
+** of the GNU General Public License if such license has been
+** publicly approved by Trolltech ASA (or its successors, if any)
+** and the KDE Free Qt Foundation.
+**
+** Please review the following information to ensure GNU General
+** Public Licensing requirements will be met:
+** http://trolltech.com/products/qt/licenses/licensing/opensource/.
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
+** or contact the sales department at sales@trolltech.com.
+**
+** This file may be used under the terms of the Q Public License as
+** defined by Trolltech ASA and appearing in the file LICENSE.QPL
+** included in the packaging of this file. Licensees holding valid Qt
+** Commercial licenses may use this file in accordance with the Qt
+** Commercial License Agreement provided with the Software.
+**
+** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
+** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
+** herein.
+**
+**********************************************************************/
+
+#include "qpushbutton.h"
+#ifndef QT_NO_PUSHBUTTON
+#include "qdialog.h"
+#include "qfontmetrics.h"
+#include "qpainter.h"
+#include "qdrawutil.h"
+#include "qpixmap.h"
+#include "qbitmap.h"
+#include "qpopupmenu.h"
+#include "qguardedptr.h"
+#include "qapplication.h"
+#include "qtoolbar.h"
+#include "qstyle.h"
+#if defined(QT_ACCESSIBILITY_SUPPORT)
+#include "qaccessible.h"
+#endif
+
+/*!
+ \class QPushButton qpushbutton.h
+ \brief The QPushButton widget provides a command button.
+
+ \ingroup basic
+ \mainclass
+
+ The push button, or command button, is perhaps the most commonly
+ used widget in any graphical user interface. Push (click) a button
+ to command the computer to perform some action, or to answer a
+ question. Typical buttons are OK, Apply, Cancel, Close, Yes, No
+ and Help.
+
+ A command button is rectangular and typically displays a text
+ label describing its action. An underlined character in the label
+ (signified by preceding it with an ampersand in the text)
+ indicates an accelerator key, e.g.
+ \code
+ QPushButton *pb = new QPushButton( "&Download", this );
+ \endcode
+ In this example the accelerator is \e{Alt+D}, and the label text
+ will be displayed as <b><u>D</u>ownload</b>.
+
+ Push buttons can display a textual label or a pixmap, and
+ optionally a small icon. These can be set using the constructors
+ and changed later using setText(), setPixmap() and setIconSet().
+ If the button is disabled the appearance of the text or pixmap and
+ iconset will be manipulated with respect to the GUI style to make
+ the button look "disabled".
+
+ A push button emits the signal clicked() when it is activated by
+ the mouse, the Spacebar or by a keyboard accelerator. Connect to
+ this signal to perform the button's action. Push buttons also
+ provide less commonly used signals, for example, pressed() and
+ released().
+
+ Command buttons in dialogs are by default auto-default buttons,
+ i.e. they become the default push button automatically when they
+ receive the keyboard input focus. A default button is a push
+ button that is activated when the user presses the Enter or Return
+ key in a dialog. You can change this with setAutoDefault(). Note
+ that auto-default buttons reserve a little extra space which is
+ necessary to draw a default-button indicator. If you do not want
+ this space around your buttons, call setAutoDefault(FALSE).
+
+ Being so central, the button widget has grown to accommodate a
+ great many variations in the past decade. The Microsoft style
+ guide now shows about ten different states of Windows push buttons
+ and the text implies that there are dozens more when all the
+ combinations of features are taken into consideration.
+
+ The most important modes or states are:
+ \list
+ \i Available or not (grayed out, disabled).
+ \i Standard push button, toggling push button or menu button.
+ \i On or off (only for toggling push buttons).
+ \i Default or normal. The default button in a dialog can generally
+ be "clicked" using the Enter or Return key.
+ \i Auto-repeat or not.
+ \i Pressed down or not.
+ \endlist
+
+ As a general rule, use a push button when the application or
+ dialog window performs an action when the user clicks on it (such
+ as Apply, Cancel, Close and Help) \e and when the widget is
+ supposed to have a wide, rectangular shape with a text label.
+ Small, typically square buttons that change the state of the
+ window rather than performing an action (such as the buttons in
+ the top-right corner of the QFileDialog) are not command buttons,
+ but tool buttons. Qt provides a special class (QToolButton) for
+ these buttons.
+
+ If you need toggle behavior (see setToggleButton()) or a button
+ that auto-repeats the activation signal when being pushed down
+ like the arrows in a scroll bar (see setAutoRepeat()), a command
+ button is probably not what you want. When in doubt, use a tool
+ button.
+
+ A variation of a command button is a menu button. These provide
+ not just one command, but several, since when they are clicked
+ they pop up a menu of options. Use the method setPopup() to
+ associate a popup menu with a push button.
+
+ Other classes of buttons are option buttons (see QRadioButton) and
+ check boxes (see QCheckBox).
+
+ <img src="qpushbt-m.png"> <img src="qpushbt-w.png">
+
+ In Qt, the QButton abstract base class provides most of the modes
+ and other API, and QPushButton provides GUI logic. See QButton for
+ more information about the API.
+
+ \important text, setText, text, pixmap, setPixmap, accel, setAccel,
+ isToggleButton, setDown, isDown, isOn, state, autoRepeat,
+ isExclusiveToggle, group, setAutoRepeat, toggle, pressed, released,
+ clicked, toggled, state stateChanged
+
+ \sa QToolButton, QRadioButton QCheckBox
+ \link guibooks.html#fowler GUI Design Handbook: Push Button\endlink
+*/
+
+/*!
+ \property QPushButton::autoDefault
+ \brief whether the push button is the auto default button
+
+ If this property is set to TRUE then the push button is the auto
+ default button in a dialog.
+
+ In some GUI styles a default button is drawn with an extra frame
+ around it, up to 3 pixels or more. Qt automatically keeps this
+ space free around auto-default buttons, i.e. auto-default buttons
+ may have a slightly larger size hint.
+
+ This property's default is TRUE for buttons that have a QDialog
+ parent; otherwise it defaults to FALSE.
+
+ See the \l default property for details of how \l default and
+ auto-default interact.
+*/
+
+/*!
+ \property QPushButton::autoMask
+ \brief whether the button is automatically masked
+
+ \sa QWidget::setAutoMask()
+*/
+
+/*!
+ \property QPushButton::default
+ \brief whether the push button is the default button
+
+ If this property is set to TRUE then the push button will be
+ pressed if the user presses the Enter (or Return) key in a dialog.
+
+ Regardless of focus, if the user presses Enter: If there is a
+ default button the default button is pressed; otherwise, if
+ there are one or more \l autoDefault buttons the first \l autoDefault
+ button that is next in the tab order is pressed. If there are no
+ default or \l autoDefault buttons only pressing Space on a button
+ with focus, mouse clicking, or using an accelerator will press a
+ button.
+
+ In a dialog, only one push button at a time can be the default
+ button. This button is then displayed with an additional frame
+ (depending on the GUI style).
+
+ The default button behavior is provided only in dialogs. Buttons
+ can always be clicked from the keyboard by pressing Enter (or
+ Return) or the Spacebar when the button has focus.
+
+ This property's default is FALSE.
+*/
+
+/*!
+ \property QPushButton::flat
+ \brief whether the border is disabled
+
+ This property's default is FALSE.
+*/
+
+/*!
+ \property QPushButton::iconSet
+ \brief the icon set on the push button
+
+ This property will return 0 if the push button has no iconset.
+*/
+
+/*!
+ \property QPushButton::on
+ \brief whether the push button is toggled
+
+ This property should only be set for toggle push buttons. The
+ default value is FALSE.
+
+ \sa isOn(), toggle(), toggled(), isToggleButton()
+*/
+
+/*!
+ \property QPushButton::toggleButton
+ \brief whether the button is a toggle button
+
+ Toggle buttons have an on/off state similar to \link QCheckBox
+ check boxes. \endlink A push button is initially not a toggle
+ button.
+
+ \sa setOn(), toggle(), isToggleButton() toggled()
+*/
+
+/*! \property QPushButton::menuButton
+ \brief whether the push button has a menu button on it
+ \obsolete
+
+ If this property is set to TRUE, then a down arrow is drawn on the push
+ button to indicate that a menu will pop up if the user clicks on the
+ arrow.
+*/
+
+class QPushButtonPrivate
+{
+public:
+ QPushButtonPrivate()
+ :iconset( 0 )
+ {}
+ ~QPushButtonPrivate()
+ {
+#ifndef QT_NO_ICONSET
+ delete iconset;
+#endif
+ }
+#ifndef QT_NO_POPUPMENU
+ QGuardedPtr<QPopupMenu> popup;
+#endif
+ QIconSet* iconset;
+};
+
+
+/*!
+ Constructs a push button with no text.
+
+ The \a parent and \a name arguments are sent on to the QWidget
+ constructor.
+*/
+
+QPushButton::QPushButton( QWidget *parent, const char *name )
+ : QButton( parent, name )
+{
+ init();
+}
+
+/*!
+ Constructs a push button called \a name with the parent \a parent
+ and the text \a text.
+*/
+
+QPushButton::QPushButton( const QString &text, QWidget *parent,
+ const char *name )
+ : QButton( parent, name )
+{
+ init();
+ setText( text );
+}
+
+
+/*!
+ Constructs a push button with an \a icon and a \a text.
+
+ Note that you can also pass a QPixmap object as an icon (thanks to
+ the implicit type conversion provided by C++).
+
+ The \a parent and \a name arguments are sent to the QWidget
+ constructor.
+*/
+#ifndef QT_NO_ICONSET
+QPushButton::QPushButton( const QIconSet& icon, const QString &text,
+ QWidget *parent, const char *name )
+ : QButton( parent, name )
+{
+ init();
+ setText( text );
+ setIconSet( icon );
+}
+#endif
+
+
+/*!
+ Destroys the push button.
+*/
+QPushButton::~QPushButton()
+{
+ delete d;
+}
+
+void QPushButton::init()
+{
+ d = 0;
+ defButton = FALSE;
+ lastEnabled = FALSE;
+ hasMenuArrow = FALSE;
+ flt = FALSE;
+#ifndef QT_NO_DIALOG
+ autoDefButton = ::qt_cast<QDialog*>(topLevelWidget()) != 0;
+#else
+ autoDefButton = FALSE;
+#endif
+ setBackgroundMode( PaletteButton );
+ setSizePolicy( QSizePolicy( QSizePolicy::Minimum, QSizePolicy::Fixed ) );
+}
+
+
+/*
+ Makes the push button a toggle button if \a enable is TRUE or a normal
+ push button if \a enable is FALSE.
+
+ Toggle buttons have an on/off state similar to \link QCheckBox check
+ boxes. \endlink A push button is initially not a toggle button.
+
+ \sa setOn(), toggle(), isToggleButton() toggled()
+*/
+
+void QPushButton::setToggleButton( bool enable )
+{
+ QButton::setToggleButton( enable );
+}
+
+
+/*
+ Switches a toggle button on if \a enable is TRUE or off if \a enable is
+ FALSE.
+ \sa isOn(), toggle(), toggled(), isToggleButton()
+*/
+
+void QPushButton::setOn( bool enable )
+{
+ if ( !isToggleButton() )
+ return;
+ QButton::setOn( enable );
+}
+
+void QPushButton::setAutoDefault( bool enable )
+{
+ if ( (bool)autoDefButton == enable )
+ return;
+ autoDefButton = enable;
+ update();
+ updateGeometry();
+}
+
+
+void QPushButton::setDefault( bool enable )
+{
+ if ( (bool)defButton == enable )
+ return; // no change
+ defButton = enable;
+#ifndef QT_NO_DIALOG
+ if ( defButton && ::qt_cast<QDialog*>(topLevelWidget()) )
+ ((QDialog*)topLevelWidget())->setMainDefault( this );
+#endif
+ update();
+#if defined(QT_ACCESSIBILITY_SUPPORT)
+ QAccessible::updateAccessibility( this, 0, QAccessible::StateChanged );
+#endif
+}
+
+
+/*!
+ \reimp
+*/
+QSize QPushButton::sizeHint() const
+{
+ constPolish();
+
+ int w = 0, h = 0;
+
+ // calculate contents size...
+#ifndef QT_NO_ICONSET
+ if ( iconSet() && !iconSet()->isNull() ) {
+ int iw = iconSet()->pixmap( QIconSet::Small, QIconSet::Normal ).width() + 4;
+ int ih = iconSet()->pixmap( QIconSet::Small, QIconSet::Normal ).height();
+ w += iw;
+ h = QMAX( h, ih );
+ }
+#endif
+ if ( isMenuButton() )
+ w += style().pixelMetric(QStyle::PM_MenuButtonIndicator, this);
+
+ if ( pixmap() ) {
+ QPixmap *pm = (QPixmap *)pixmap();
+ w += pm->width();
+ h += pm->height();
+ } else {
+ QString s( text() );
+ bool empty = s.isEmpty();
+ if ( empty )
+ s = QString::fromLatin1("XXXX");
+ QFontMetrics fm = fontMetrics();
+ QSize sz = fm.size( ShowPrefix, s );
+ if(!empty || !w)
+ w += sz.width();
+ if(!empty || !h)
+ h = QMAX(h, sz.height());
+ }
+
+ return (style().sizeFromContents(QStyle::CT_PushButton, this, QSize(w, h)).
+ expandedTo(QApplication::globalStrut()));
+}
+
+
+/*!
+ \reimp
+*/
+void QPushButton::move( int x, int y )
+{
+ QWidget::move( x, y );
+}
+
+/*!
+ \reimp
+*/
+void QPushButton::move( const QPoint &p )
+{
+ move( p.x(), p.y() );
+}
+
+/*!
+ \reimp
+*/
+void QPushButton::resize( int w, int h )
+{
+ QWidget::resize( w, h );
+}
+
+/*!
+ \reimp
+*/
+void QPushButton::resize( const QSize &s )
+{
+ resize( s.width(), s.height() );
+}
+
+/*!
+ \reimp
+*/
+void QPushButton::setGeometry( int x, int y, int w, int h )
+{
+ QWidget::setGeometry( x, y, w, h );
+}
+
+/*!
+ \reimp
+*/
+void QPushButton::setGeometry( const QRect &r )
+{
+ QWidget::setGeometry( r );
+}
+
+/*!
+ \reimp
+ */
+void QPushButton::resizeEvent( QResizeEvent * )
+{
+ if ( autoMask() )
+ updateMask();
+}
+
+/*!
+ \reimp
+*/
+void QPushButton::drawButton( QPainter *paint )
+{
+ int diw = 0;
+ if ( isDefault() || autoDefault() ) {
+ diw = style().pixelMetric(QStyle::PM_ButtonDefaultIndicator, this);
+
+ if ( diw > 0 ) {
+ if (backgroundMode() == X11ParentRelative) {
+ erase( 0, 0, width(), diw );
+ erase( 0, 0, diw, height() );
+ erase( 0, height() - diw, width(), diw );
+ erase( width() - diw, 0, diw, height() );
+ } else if ( parentWidget() && parentWidget()->backgroundPixmap() ){
+ // pseudo tranparency
+ paint->drawTiledPixmap( 0, 0, width(), diw,
+ *parentWidget()->backgroundPixmap(),
+ x(), y() );
+ paint->drawTiledPixmap( 0, 0, diw, height(),
+ *parentWidget()->backgroundPixmap(),
+ x(), y() );
+ paint->drawTiledPixmap( 0, height()-diw, width(), diw,
+ *parentWidget()->backgroundPixmap(),
+ x(), y()+height() );
+ paint->drawTiledPixmap( width()-diw, 0, diw, height(),
+ *parentWidget()->backgroundPixmap(),
+ x()+width(), y() );
+ } else {
+ paint->fillRect( 0, 0, width(), diw,
+ colorGroup().brush(QColorGroup::Background) );
+ paint->fillRect( 0, 0, diw, height(),
+ colorGroup().brush(QColorGroup::Background) );
+ paint->fillRect( 0, height()-diw, width(), diw,
+ colorGroup().brush(QColorGroup::Background) );
+ paint->fillRect( width()-diw, 0, diw, height(),
+ colorGroup().brush(QColorGroup::Background) );
+ }
+
+ }
+ }
+
+ QStyle::SFlags flags = QStyle::Style_Default;
+ if (isEnabled())
+ flags |= QStyle::Style_Enabled;
+ if (hasFocus())
+ flags |= QStyle::Style_HasFocus;
+ if (isDown())
+ flags |= QStyle::Style_Down;
+ if (isOn())
+ flags |= QStyle::Style_On;
+ if (! isFlat() && ! isDown())
+ flags |= QStyle::Style_Raised;
+ if (isDefault())
+ flags |= QStyle::Style_ButtonDefault;
+
+ style().drawControl(QStyle::CE_PushButton, paint, this, rect(), colorGroup(), flags);
+ drawButtonLabel( paint );
+
+ lastEnabled = isEnabled();
+}
+
+
+/*!
+ \reimp
+*/
+void QPushButton::drawButtonLabel( QPainter *paint )
+{
+
+ QStyle::SFlags flags = QStyle::Style_Default;
+ if (isEnabled())
+ flags |= QStyle::Style_Enabled;
+ if (hasFocus())
+ flags |= QStyle::Style_HasFocus;
+ if (isDown())
+ flags |= QStyle::Style_Down;
+ if (isOn())
+ flags |= QStyle::Style_On;
+ if (! isFlat() && ! isDown())
+ flags |= QStyle::Style_Raised;
+ if (isDefault())
+ flags |= QStyle::Style_ButtonDefault;
+
+ style().drawControl(QStyle::CE_PushButtonLabel, paint, this,
+ style().subRect(QStyle::SR_PushButtonContents, this),
+ colorGroup(), flags);
+}
+
+
+/*!
+ \reimp
+ */
+void QPushButton::updateMask()
+{
+ QBitmap bm( size() );
+ bm.fill( color0 );
+
+ {
+ QPainter p( &bm, this );
+ style().drawControlMask(QStyle::CE_PushButton, &p, this, rect());
+ }
+
+ setMask( bm );
+}
+
+/*!
+ \reimp
+*/
+void QPushButton::focusInEvent( QFocusEvent *e )
+{
+ if (autoDefButton && !defButton) {
+ defButton = TRUE;
+#ifndef QT_NO_DIALOG
+ if ( defButton && ::qt_cast<QDialog*>(topLevelWidget()) )
+ ((QDialog*)topLevelWidget())->setDefault( this );
+#endif
+ }
+ QButton::focusInEvent( e );
+}
+
+/*!
+ \reimp
+*/
+void QPushButton::focusOutEvent( QFocusEvent *e )
+{
+#ifndef QT_NO_DIALOG
+ if ( defButton && autoDefButton ) {
+ if ( ::qt_cast<QDialog*>(topLevelWidget()) )
+ ((QDialog*)topLevelWidget())->setDefault( 0 );
+ }
+#endif
+
+ QButton::focusOutEvent( e );
+#ifndef QT_NO_POPUPMENU
+ if ( popup() && popup()->isVisible() ) // restore pressed status
+ setDown( TRUE );
+#endif
+}
+
+
+#ifndef QT_NO_POPUPMENU
+/*!
+ Associates the popup menu \a popup with this push button. This
+ turns the button into a menu button.
+
+ Ownership of the popup menu is \e not transferred to the push
+ button.
+
+ \sa popup()
+*/
+void QPushButton::setPopup( QPopupMenu* popup )
+{
+ if ( !d )
+ d = new QPushButtonPrivate;
+ if ( popup && !d->popup )
+ connect( this, SIGNAL( pressed() ), this, SLOT( popupPressed() ) );
+
+ d->popup = popup;
+ setIsMenuButton( popup != 0 );
+}
+#endif //QT_NO_POPUPMENU
+#ifndef QT_NO_ICONSET
+void QPushButton::setIconSet( const QIconSet& icon )
+{
+ if ( !d )
+ d = new QPushButtonPrivate;
+ if ( !icon.isNull() ) {
+ if ( d->iconset )
+ *d->iconset = icon;
+ else
+ d->iconset = new QIconSet( icon );
+ } else if ( d->iconset) {
+ delete d->iconset;
+ d->iconset = 0;
+ }
+
+ update();
+ updateGeometry();
+}
+
+
+QIconSet* QPushButton::iconSet() const
+{
+ return d ? d->iconset : 0;
+}
+#endif // QT_NO_ICONSET
+#ifndef QT_NO_POPUPMENU
+/*!
+ Returns the button's associated popup menu or 0 if no popup menu
+ has been set.
+
+ \sa setPopup()
+*/
+QPopupMenu* QPushButton::popup() const
+{
+ return d ? (QPopupMenu*)d->popup : 0;
+}
+
+void QPushButton::popupPressed()
+{
+ QPopupMenu* popup = d ? (QPopupMenu*) d->popup : 0;
+ QGuardedPtr<QPushButton> that = this;
+ if ( isDown() && popup ) {
+ bool horizontal = TRUE;
+ bool topLeft = TRUE; // ### always TRUE
+#ifndef QT_NO_TOOLBAR
+ QToolBar *tb = ::qt_cast<QToolBar*>(parentWidget());
+ if ( tb && tb->orientation() == Vertical )
+ horizontal = FALSE;
+#endif
+ if ( horizontal ) {
+ if ( topLeft ) {
+ if ( mapToGlobal( QPoint( 0, rect().bottom() ) ).y() + popup->sizeHint().height() <= qApp->desktop()->height() )
+ popup->exec( mapToGlobal( rect().bottomLeft() ) );
+ else
+ popup->exec( mapToGlobal( rect().topLeft() - QPoint( 0, popup->sizeHint().height() ) ) );
+ } else {
+ QSize sz( popup->sizeHint() );
+ QPoint p = mapToGlobal( rect().topLeft() );
+ p.ry() -= sz.height();
+ popup->exec( p );
+ }
+ } else {
+ if ( topLeft ) {
+ if ( mapToGlobal( QPoint( rect().right(), 0 ) ).x() + popup->sizeHint().width() <= qApp->desktop()->width() )
+ popup->exec( mapToGlobal( rect().topRight() ) );
+ else
+ popup->exec( mapToGlobal( rect().topLeft() - QPoint( popup->sizeHint().width(), 0 ) ) );
+ } else {
+ QSize sz( popup->sizeHint() );
+ QPoint p = mapToGlobal( rect().topLeft() );
+ p.rx() -= sz.width();
+ popup->exec( p );
+ }
+ }
+ if (that)
+ setDown( FALSE );
+ }
+}
+#endif
+
+void QPushButton::setFlat( bool f )
+{
+ flt = f;
+ update();
+}
+
+bool QPushButton::isFlat() const
+{
+ return flt;
+}
+
+/*!
+ \obsolete
+ \fn virtual void QPushButton::setIsMenuButton( bool enable )
+*/
+
+#endif