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5.15: qpushbutton.cpp & qpushbutton_p.h original

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kleuter 2021-05-12 21:20:44 +02:00
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5.15.2/qtbase/src/widgets/widgets/qpushbutton.cpp Normal file
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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtWidgets module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qapplication.h"
#include "qbitmap.h"
#include "qdesktopwidget.h"
#include <private/qdesktopwidget_p.h>
#if QT_CONFIG(dialog)
#include <private/qdialog_p.h>
#endif
#include "qdrawutil.h"
#include "qevent.h"
#include "qfontmetrics.h"
#include "qstylepainter.h"
#include "qpixmap.h"
#include "qpointer.h"
#include "qpushbutton.h"
#include "qstyle.h"
#include "qstyleoption.h"
#if QT_CONFIG(toolbar)
#include "qtoolbar.h"
#endif
#include "qdebug.h"
#include "qlayoutitem.h"
#if QT_CONFIG(dialogbuttonbox)
#include "qdialogbuttonbox.h"
#endif
#ifndef QT_NO_ACCESSIBILITY
#include "qaccessible.h"
#endif
#if QT_CONFIG(menu)
#include "qmenu.h"
#include "private/qmenu_p.h"
#endif
#include "private/qpushbutton_p.h"
QT_BEGIN_NAMESPACE
/*!
\class QPushButton
\brief The QPushButton widget provides a command button.
\ingroup basicwidgets
\inmodule QtWidgets
\image windows-pushbutton.png
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. A shortcut key can be specified by
preceding the preferred character with an ampersand in the
text. For example:
\snippet code/src_gui_widgets_qpushbutton.cpp 0
In this example the shortcut is \e{Alt+D}. See the \l
{QShortcut#mnemonic}{QShortcut} documentation for details (to
display an actual ampersand, use '&&').
Push buttons display a textual label, and optionally a small
icon. These can be set using the constructors and changed later
using setText() and setIcon(). If the button is disabled, the
appearance of the text and icon 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 shortcut. 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
\li Available or not (grayed out, disabled).
\li Standard push button, toggling push button or menu button.
\li On or off (only for toggling push buttons).
\li Default or normal. The default button in a dialog can generally
be "clicked" using the Enter or Return key.
\li Auto-repeat or not.
\li 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 setCheckable()) 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.
\note On \macos when a push button's width becomes smaller than 50 or
its height becomes smaller than 30, the button's corners are
changed from round to square. Use the setMinimumSize()
function to prevent this behavior.
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 setMenu() to
associate a popup menu with a push button.
Other classes of buttons are option buttons (see QRadioButton) and
check boxes (see QCheckBox).
In Qt, the QAbstractButton base class provides most of the modes
and other API, and QPushButton provides GUI logic.
See QAbstractButton for more information about the API.
\sa QToolButton, QRadioButton, QCheckBox, {fowler}{GUI Design Handbook: Push Button}
*/
/*!
\property QPushButton::autoDefault
\brief whether the push button is an auto default button
If this property is set to true then the push button is an auto
default button.
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::default
\brief whether the push button is the default button
Default and autodefault buttons decide what happens when the user
presses enter in a dialog.
A button with this property set to true (i.e., the dialog's
\e default button,) will automatically be pressed when the user presses enter,
with one exception: if an \a autoDefault button currently has focus, the autoDefault
button is pressed. When the dialog has \l autoDefault buttons but no default button,
pressing enter will press either the \l autoDefault button that currently has focus, or if no
button has focus, the next \l autoDefault button in the focus chain.
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 Spacebar when
the button has focus.
If the default property is set to false on the current default button
while the dialog is visible, a new default will automatically be
assigned the next time a push button in the dialog receives focus.
This property's default is false.
*/
/*!
\property QPushButton::flat
\brief whether the button border is raised
This property's default is false. If this property is set, most
styles will not paint the button background unless the button is
being pressed. setAutoFillBackground() can be used to ensure that
the background is filled using the QPalette::Button brush.
*/
/*!
Constructs a push button with no text and a \a parent.
*/
QPushButton::QPushButton(QWidget *parent)
: QAbstractButton(*new QPushButtonPrivate, parent)
{
Q_D(QPushButton);
d->init();
}
/*!
Constructs a push button with the parent \a parent and the text \a
text.
*/
QPushButton::QPushButton(const QString &text, QWidget *parent)
: QPushButton(parent)
{
setText(text);
}
/*!
Constructs a push button with an \a icon and a \a text, and a \a parent.
Note that you can also pass a QPixmap object as an icon (thanks to
the implicit type conversion provided by C++).
*/
QPushButton::QPushButton(const QIcon& icon, const QString &text, QWidget *parent)
: QPushButton(*new QPushButtonPrivate, parent)
{
setText(text);
setIcon(icon);
}
/*! \internal
*/
QPushButton::QPushButton(QPushButtonPrivate &dd, QWidget *parent)
: QAbstractButton(dd, parent)
{
Q_D(QPushButton);
d->init();
}
/*!
Destroys the push button.
*/
QPushButton::~QPushButton()
{
}
#if QT_CONFIG(dialog)
QDialog *QPushButtonPrivate::dialogParent() const
{
Q_Q(const QPushButton);
const QWidget *p = q;
while (p && !p->isWindow()) {
p = p->parentWidget();
if (const QDialog *dialog = qobject_cast<const QDialog *>(p))
return const_cast<QDialog *>(dialog);
}
return nullptr;
}
#endif
/*!
Initialize \a option with the values from this QPushButton. This method is useful
for subclasses when they need a QStyleOptionButton, but don't want to fill
in all the information themselves.
\sa QStyleOption::initFrom()
*/
void QPushButton::initStyleOption(QStyleOptionButton *option) const
{
if (!option)
return;
Q_D(const QPushButton);
option->initFrom(this);
option->features = QStyleOptionButton::None;
if (d->flat)
option->features |= QStyleOptionButton::Flat;
#if QT_CONFIG(menu)
if (d->menu)
option->features |= QStyleOptionButton::HasMenu;
#endif
if (autoDefault())
option->features |= QStyleOptionButton::AutoDefaultButton;
if (d->defaultButton)
option->features |= QStyleOptionButton::DefaultButton;
if (d->down || d->menuOpen)
option->state |= QStyle::State_Sunken;
if (d->checked)
option->state |= QStyle::State_On;
if (!d->flat && !d->down)
option->state |= QStyle::State_Raised;
if (underMouse() && hasMouseTracking())
option->state.setFlag(QStyle::State_MouseOver, d->hovering);
option->text = d->text;
option->icon = d->icon;
option->iconSize = iconSize();
}
void QPushButton::setAutoDefault(bool enable)
{
Q_D(QPushButton);
uint state = enable ? QPushButtonPrivate::On : QPushButtonPrivate::Off;
if (d->autoDefault != QPushButtonPrivate::Auto && d->autoDefault == state)
return;
d->autoDefault = state;
d->sizeHint = QSize();
update();
updateGeometry();
}
bool QPushButton::autoDefault() const
{
Q_D(const QPushButton);
if(d->autoDefault == QPushButtonPrivate::Auto)
return ( d->dialogParent() != nullptr );
return d->autoDefault;
}
void QPushButton::setDefault(bool enable)
{
Q_D(QPushButton);
if (d->defaultButton == enable)
return;
d->defaultButton = enable;
#if QT_CONFIG(dialog)
if (d->defaultButton) {
if (QDialog *dlg = d->dialogParent())
dlg->d_func()->setMainDefault(this);
}
#endif
update();
#ifndef QT_NO_ACCESSIBILITY
QAccessible::State s;
s.defaultButton = true;
QAccessibleStateChangeEvent event(this, s);
QAccessible::updateAccessibility(&event);
#endif
}
bool QPushButton::isDefault() const
{
Q_D(const QPushButton);
return d->defaultButton;
}
/*!
\reimp
*/
QSize QPushButton::sizeHint() const
{
Q_D(const QPushButton);
if (d->sizeHint.isValid() && d->lastAutoDefault == autoDefault())
return d->sizeHint;
d->lastAutoDefault = autoDefault();
ensurePolished();
int w = 0, h = 0;
QStyleOptionButton opt;
initStyleOption(&opt);
// calculate contents size...
#if !defined(QT_NO_ICON) && QT_CONFIG(dialogbuttonbox)
bool showButtonBoxIcons = qobject_cast<QDialogButtonBox*>(parentWidget())
&& style()->styleHint(QStyle::SH_DialogButtonBox_ButtonsHaveIcons);
if (!icon().isNull() || showButtonBoxIcons) {
int ih = opt.iconSize.height();
int iw = opt.iconSize.width() + 4;
w += iw;
h = qMax(h, ih);
}
#endif
QString s(text());
bool empty = s.isEmpty();
if (empty)
s = QStringLiteral("XXXX");
QFontMetrics fm = fontMetrics();
QSize sz = fm.size(Qt::TextShowMnemonic, s);
if(!empty || !w)
w += sz.width();
if(!empty || !h)
h = qMax(h, sz.height());
opt.rect.setSize(QSize(w, h)); // PM_MenuButtonIndicator depends on the height
#if QT_CONFIG(menu)
if (menu())
w += style()->pixelMetric(QStyle::PM_MenuButtonIndicator, &opt, this);
#endif
d->sizeHint = (style()->sizeFromContents(QStyle::CT_PushButton, &opt, QSize(w, h), this).
expandedTo(QApplication::globalStrut()));
return d->sizeHint;
}
/*!
\reimp
*/
QSize QPushButton::minimumSizeHint() const
{
return sizeHint();
}
/*!\reimp
*/
void QPushButton::paintEvent(QPaintEvent *)
{
QStylePainter p(this);
QStyleOptionButton option;
initStyleOption(&option);
p.drawControl(QStyle::CE_PushButton, option);
}
/*! \reimp */
void QPushButton::keyPressEvent(QKeyEvent *e)
{
Q_D(QPushButton);
switch (e->key()) {
case Qt::Key_Enter:
case Qt::Key_Return:
if (autoDefault() || d->defaultButton) {
click();
break;
}
Q_FALLTHROUGH();
default:
QAbstractButton::keyPressEvent(e);
}
}
/*!
\reimp
*/
void QPushButton::focusInEvent(QFocusEvent *e)
{
Q_D(QPushButton);
if (e->reason() != Qt::PopupFocusReason && autoDefault() && !d->defaultButton) {
d->defaultButton = true;
#if QT_CONFIG(dialog)
QDialog *dlg = qobject_cast<QDialog*>(window());
if (dlg)
dlg->d_func()->setDefault(this);
#endif
}
QAbstractButton::focusInEvent(e);
}
/*!
\reimp
*/
void QPushButton::focusOutEvent(QFocusEvent *e)
{
Q_D(QPushButton);
if (e->reason() != Qt::PopupFocusReason && autoDefault() && d->defaultButton) {
#if QT_CONFIG(dialog)
QDialog *dlg = qobject_cast<QDialog*>(window());
if (dlg)
dlg->d_func()->setDefault(nullptr);
else
d->defaultButton = false;
#endif
}
QAbstractButton::focusOutEvent(e);
#if QT_CONFIG(menu)
if (d->menu && d->menu->isVisible()) // restore pressed status
setDown(true);
#endif
}
/*!
\reimp
*/
bool QPushButton::hitButton(const QPoint &pos) const
{
QStyleOptionButton option;
initStyleOption(&option);
const QRect bevel = style()->subElementRect(QStyle::SE_PushButtonBevel, &option, this);
return bevel.contains(pos);
}
#if QT_CONFIG(menu)
/*!
Associates the popup menu \a menu with this push button. This
turns the button into a menu button, which in some styles will
produce a small triangle to the right of the button's text.
Ownership of the menu is \e not transferred to the push button.
\image fusion-pushbutton-menu.png Screenshot of a Fusion style push button with popup menu.
A push button with popup menus shown in the \l{Qt Widget Gallery}
{Fusion widget style}.
\sa menu()
*/
void QPushButton::setMenu(QMenu* menu)
{
Q_D(QPushButton);
if (menu == d->menu)
return;
if (menu && !d->menu) {
connect(this, SIGNAL(pressed()), this, SLOT(_q_popupPressed()), Qt::UniqueConnection);
}
if (d->menu)
removeAction(d->menu->menuAction());
d->menu = menu;
if (d->menu)
addAction(d->menu->menuAction());
d->resetLayoutItemMargins();
d->sizeHint = QSize();
update();
updateGeometry();
}
/*!
Returns the button's associated popup menu or \nullptr if no popup
menu has been set.
\sa setMenu()
*/
QMenu* QPushButton::menu() const
{
Q_D(const QPushButton);
return d->menu;
}
/*!
Shows (pops up) the associated popup menu. If there is no such
menu, this function does nothing. This function does not return
until the popup menu has been closed by the user.
*/
void QPushButton::showMenu()
{
Q_D(QPushButton);
if (!d || !d->menu)
return;
setDown(true);
d->_q_popupPressed();
}
void QPushButtonPrivate::init()
{
Q_Q(QPushButton);
q->setAttribute(Qt::WA_MacShowFocusRect);
resetLayoutItemMargins();
}
void QPushButtonPrivate::_q_popupPressed()
{
Q_Q(QPushButton);
if (!down || !menu)
return;
menu->setNoReplayFor(q);
QPoint menuPos = adjustedMenuPosition();
QPointer<QPushButton> guard(q);
QMenuPrivate::get(menu)->causedPopup.widget = guard;
//Because of a delay in menu effects, we must keep track of the
//menu visibility to avoid flicker on button release
menuOpen = true;
menu->exec(menuPos);
if (guard) {
menuOpen = false;
q->setDown(false);
}
}
QPoint QPushButtonPrivate::adjustedMenuPosition()
{
Q_Q(QPushButton);
bool horizontal = true;
#if QT_CONFIG(toolbar)
QToolBar *tb = qobject_cast<QToolBar*>(parent);
if (tb && tb->orientation() == Qt::Vertical)
horizontal = false;
#endif
QWidgetItem item(q);
QRect rect = item.geometry();
rect.setRect(rect.x() - q->x(), rect.y() - q->y(), rect.width(), rect.height());
QSize menuSize = menu->sizeHint();
QPoint globalPos = q->mapToGlobal(rect.topLeft());
int x = globalPos.x();
int y = globalPos.y();
const QRect availableGeometry = QDesktopWidgetPrivate::availableGeometry(q);
if (horizontal) {
if (globalPos.y() + rect.height() + menuSize.height() <= availableGeometry.bottom()) {
y += rect.height();
} else if (globalPos.y() - menuSize.height() >= availableGeometry.y()) {
y -= menuSize.height();
}
if (q->layoutDirection() == Qt::RightToLeft)
x += rect.width() - menuSize.width();
} else {
if (globalPos.x() + rect.width() + menu->sizeHint().width() <= availableGeometry.right()) {
x += rect.width();
} else if (globalPos.x() - menuSize.width() >= availableGeometry.x()) {
x -= menuSize.width();
}
}
return QPoint(x,y);
}
#endif // QT_CONFIG(menu)
void QPushButtonPrivate::resetLayoutItemMargins()
{
Q_Q(QPushButton);
QStyleOptionButton opt;
q->initStyleOption(&opt);
setLayoutItemMargins(QStyle::SE_PushButtonLayoutItem, &opt);
}
void QPushButton::setFlat(bool flat)
{
Q_D(QPushButton);
if (d->flat == flat)
return;
d->flat = flat;
d->resetLayoutItemMargins();
d->sizeHint = QSize();
update();
updateGeometry();
}
bool QPushButton::isFlat() const
{
Q_D(const QPushButton);
return d->flat;
}
/*! \reimp */
bool QPushButton::event(QEvent *e)
{
Q_D(QPushButton);
if (e->type() == QEvent::ParentChange) {
#if QT_CONFIG(dialog)
if (QDialog *dialog = d->dialogParent()) {
if (d->defaultButton)
dialog->d_func()->setMainDefault(this);
}
#endif
} else if (e->type() == QEvent::StyleChange
#ifdef Q_OS_MAC
|| e->type() == QEvent::MacSizeChange
#endif
) {
d->resetLayoutItemMargins();
updateGeometry();
} else if (e->type() == QEvent::PolishRequest) {
updateGeometry();
} else if (e->type() == QEvent::MouseMove) {
const QMouseEvent *mouseEvent = static_cast<QMouseEvent *>(e);
if (testAttribute(Qt::WA_Hover)) {
bool hit = false;
if (underMouse())
hit = hitButton(mouseEvent->pos());
if (hit != d->hovering) {
update(rect());
d->hovering = hit;
}
}
}
return QAbstractButton::event(e);
}
QT_END_NAMESPACE
#include "moc_qpushbutton.cpp"

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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtWidgets module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QPUSHBUTTON_P_H
#define QPUSHBUTTON_P_H
#include <QtWidgets/private/qtwidgetsglobal_p.h>
#include "private/qabstractbutton_p.h"
QT_REQUIRE_CONFIG(pushbutton);
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
QT_BEGIN_NAMESPACE
class QDialog;
class QPushButton;
class QPushButtonPrivate : public QAbstractButtonPrivate
{
Q_DECLARE_PUBLIC(QPushButton)
public:
enum AutoDefaultValue { Off = 0, On = 1, Auto = 2 };
QPushButtonPrivate()
: QAbstractButtonPrivate(QSizePolicy::PushButton), autoDefault(Auto),
defaultButton(false), flat(false), menuOpen(false), hovering(false),
lastAutoDefault(false)
{}
void init();
static QPushButtonPrivate* get(QPushButton *b) { return b->d_func(); }
#if QT_CONFIG(menu)
QPoint adjustedMenuPosition();
#endif
void resetLayoutItemMargins();
void _q_popupPressed();
#if QT_CONFIG(dialog)
QDialog *dialogParent() const;
#else
QDialog *dialogParent() const { return 0; };
#endif
QPointer<QMenu> menu;
uint autoDefault : 2;
uint defaultButton : 1;
uint flat : 1;
uint menuOpen : 1;
uint hovering : 1;
mutable uint lastAutoDefault : 1;
};
QT_END_NAMESPACE
#endif // QPUSHBUTTON_P_H