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katie/src/gui/kernel/qlayout.cpp
Ivailo Monev a6af900561 mostly mac/win cruft removal 
Signed-off-by: Ivailo Monev <xakepa10@laimg.moc>
2016-10-05 03:45:29 +00:00

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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtGui 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://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 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qlayout.h"
#include "qapplication.h"
#include "qlayoutengine_p.h"
#include "qmenubar.h"
#include "qtoolbar.h"
#include "qsizegrip.h"
#include "qevent.h"
#include "qstyle.h"
#include "qvariant.h"
#include "qwidget_p.h"
#include "qlayout_p.h"
#include "qformlayout.h"
QT_BEGIN_NAMESPACE
static int menuBarHeightForWidth(QWidget *menubar, int w)
{
if (menubar && !menubar->isHidden() && !menubar->isWindow()) {
int result = menubar->heightForWidth(qMax(w, menubar->minimumWidth()));
if (result == -1)
result = menubar->sizeHint().height();
const int min = qSmartMinSize(menubar).height();
result = qBound(min, result, menubar->maximumSize().height());
if (result != -1)
return result;
}
return 0;
}
/*!
\class QLayout
\brief The QLayout class is the base class of geometry managers.
\ingroup geomanagement
This is an abstract base class inherited by the concrete classes
QBoxLayout, QGridLayout, QFormLayout, and QStackedLayout.
For users of QLayout subclasses or of QMainWindow there is seldom
any need to use the basic functions provided by QLayout, such as
setSizeConstraint() or setMenuBar(). See \l{Layout Management}
for more information.
To make your own layout manager, implement the functions
addItem(), sizeHint(), setGeometry(), itemAt() and takeAt(). You
should also implement minimumSize() to ensure your layout isn't
resized to zero size if there is too little space. To support
children whose heights depend on their widths, implement
hasHeightForWidth() and heightForWidth(). See the
\l{layouts/borderlayout}{Border Layout} and
\l{layouts/flowlayout}{Flow Layout} examples for
more information about implementing custom layout managers.
Geometry management stops when the layout manager is deleted.
\sa QLayoutItem, {Layout Management}, {Basic Layouts Example},
{Border Layout Example}, {Flow Layout Example}
*/
/*!
Constructs a new top-level QLayout, with parent \a parent.
\a parent may not be 0.
There can be only one top-level layout for a widget. It is
returned by QWidget::layout().
*/
QLayout::QLayout(QWidget *parent)
: QObject(*new QLayoutPrivate, parent)
{
if (!parent)
return;
parent->setLayout(this);
}
/*!
Constructs a new child QLayout.
This layout has to be inserted into another layout before geometry
management will work.
*/
QLayout::QLayout()
: QObject(*new QLayoutPrivate, 0)
{
}
/*! \internal
*/
QLayout::QLayout(QLayoutPrivate &dd, QLayout *lay, QWidget *w)
: QObject(dd, lay ? static_cast<QObject*>(lay) : static_cast<QObject*>(w))
{
Q_D(QLayout);
if (lay) {
lay->addItem(this);
} else if (w) {
if (w->layout()) {
qWarning("QLayout: Attempting to add QLayout \"%s\" to %s \"%s\", which"
" already has a layout",
qPrintable(QObject::objectName()), w->metaObject()->className(),
w->objectName().toLocal8Bit().data());
setParent(0);
} else {
d->topLevel = true;
w->d_func()->layout = this;
QT_TRY {
invalidate();
} QT_CATCH(...) {
w->d_func()->layout = 0;
QT_RETHROW;
}
}
}
}
QLayoutPrivate::QLayoutPrivate()
: QObjectPrivate(), insideSpacing(-1), userLeftMargin(-1), userTopMargin(-1), userRightMargin(-1),
userBottomMargin(-1), topLevel(false), enabled(true), activated(true), autoNewChild(false),
constraint(QLayout::SetDefaultConstraint), menubar(0)
{
}
void QLayoutPrivate::getMargin(int *result, int userMargin, QStyle::PixelMetric pm) const
{
if (!result)
return;
Q_Q(const QLayout);
if (userMargin >= 0) {
*result = userMargin;
} else if (!topLevel) {
*result = 0;
} else if (QWidget *pw = q->parentWidget()) {
*result = pw->style()->pixelMetric(pm, 0, pw);
} else {
*result = 0;
}
}
// Static item factory functions that allow for hooking things in Designer
QLayoutPrivate::QWidgetItemFactoryMethod QLayoutPrivate::widgetItemFactoryMethod = 0;
QLayoutPrivate::QSpacerItemFactoryMethod QLayoutPrivate::spacerItemFactoryMethod = 0;
QWidgetItem *QLayoutPrivate::createWidgetItem(const QLayout *layout, QWidget *widget)
{
if (widgetItemFactoryMethod)
if (QWidgetItem *wi = (*widgetItemFactoryMethod)(layout, widget))
return wi;
return new QWidgetItemV2(widget);
}
QSpacerItem *QLayoutPrivate::createSpacerItem(const QLayout *layout, int w, int h, QSizePolicy::Policy hPolicy, QSizePolicy::Policy vPolicy)
{
if (spacerItemFactoryMethod)
if (QSpacerItem *si = (*spacerItemFactoryMethod)(layout, w, h, hPolicy, vPolicy))
return si;
return new QSpacerItem(w, h, hPolicy, vPolicy);
}
/*!
\fn void QLayout::addItem(QLayoutItem *item)
Implemented in subclasses to add an \a item. How it is added is
specific to each subclass.
This function is not usually called in application code. To add a widget
to a layout, use the addWidget() function; to add a child layout, use the
addLayout() function provided by the relevant QLayout subclass.
\bold{Note:} The ownership of \a item is transferred to the layout, and it's
the layout's responsibility to delete it.
\sa addWidget(), QBoxLayout::addLayout(), QGridLayout::addLayout()
*/
/*!
Adds widget \a w to this layout in a manner specific to the
layout. This function uses addItem().
*/
void QLayout::addWidget(QWidget *w)
{
addChildWidget(w);
addItem(QLayoutPrivate::createWidgetItem(this, w));
}
/*!
Sets the alignment for widget \a w to \a alignment and returns
true if \a w is found in this layout (not including child
layouts); otherwise returns false.
*/
bool QLayout::setAlignment(QWidget *w, Qt::Alignment alignment)
{
int i = 0;
QLayoutItem *item = itemAt(i);
while (item) {
if (item->widget() == w) {
item->setAlignment(alignment);
invalidate();
return true;
}
++i;
item = itemAt(i);
}
return false;
}
/*!
\overload
Sets the alignment for the layout \a l to \a alignment and
returns true if \a l is found in this layout (not including child
layouts); otherwise returns false.
*/
bool QLayout::setAlignment(QLayout *l, Qt::Alignment alignment)
{
int i = 0;
QLayoutItem *item = itemAt(i);
while (item) {
if (item->layout() == l) {
item->setAlignment(alignment);
invalidate();
return true;
}
++i;
item = itemAt(i);
}
return false;
}
/*!
\fn void QLayout::setAlignment(Qt::Alignment alignment)
Sets the alignment of this item to \a alignment.
\sa QLayoutItem::setAlignment()
*/
/*!
\fn bool QLayout::isTopLevel() const
Returns true if this layout is a top-level layout, i.e. not a
child of another layout; otherwise returns false.
*/
/*!
\property QLayout::margin
\brief the width of the outside border of the layout
\obsolete
Use setContentsMargins() and getContentsMargins() instead.
\sa contentsRect(), spacing
*/
/*!
\obsolete
*/
int QLayout::margin() const
{
int left, top, right, bottom;
getContentsMargins(&left, &top, &right, &bottom);
if (left == top && top == right && right == bottom) {
return left;
} else {
return -1;
}
}
/*!
\property QLayout::spacing
\brief the spacing between widgets inside the layout
If no value is explicitly set, the layout's spacing is inherited
from the parent layout, or from the style settings for the parent
widget.
For QGridLayout and QFormLayout, it is possible to set different horizontal and
vertical spacings using \l{QGridLayout::}{setHorizontalSpacing()}
and \l{QGridLayout::}{setVerticalSpacing()}. In that case,
spacing() returns -1.
\sa contentsRect(), getContentsMargins(), QStyle::layoutSpacing(),
QStyle::pixelMetric()
*/
int QLayout::spacing() const
{
if (const QBoxLayout* boxlayout = qobject_cast<const QBoxLayout*>(this)) {
return boxlayout->spacing();
} else if (const QGridLayout* gridlayout = qobject_cast<const QGridLayout*>(this)) {
return gridlayout->spacing();
} else if (const QFormLayout* formlayout = qobject_cast<const QFormLayout*>(this)) {
return formlayout->spacing();
} else {
Q_D(const QLayout);
if (d->insideSpacing >=0) {
return d->insideSpacing;
} else {
// arbitrarily prefer horizontal spacing to vertical spacing
return qSmartSpacing(this, QStyle::PM_LayoutHorizontalSpacing);
}
}
}
/*!
\obsolete
*/
void QLayout::setMargin(int margin)
{
setContentsMargins(margin, margin, margin, margin);
}
void QLayout::setSpacing(int spacing)
{
if (QBoxLayout* boxlayout = qobject_cast<QBoxLayout*>(this)) {
boxlayout->setSpacing(spacing);
} else if (QGridLayout* gridlayout = qobject_cast<QGridLayout*>(this)) {
gridlayout->setSpacing(spacing);
} else if (QFormLayout* formlayout = qobject_cast<QFormLayout*>(this)) {
formlayout->setSpacing(spacing);
} else {
Q_D(QLayout);
d->insideSpacing = spacing;
invalidate();
}
}
/*!
\since 4.3
Sets the \a left, \a top, \a right, and \a bottom margins to use
around the layout.
By default, QLayout uses the values provided by the style. On
most platforms, the margin is 11 pixels in all directions.
\sa getContentsMargins(), QStyle::pixelMetric(),
{QStyle::}{PM_LayoutLeftMargin},
{QStyle::}{PM_LayoutTopMargin},
{QStyle::}{PM_LayoutRightMargin},
{QStyle::}{PM_LayoutBottomMargin}
*/
void QLayout::setContentsMargins(int left, int top, int right, int bottom)
{
Q_D(QLayout);
if (d->userLeftMargin == left && d->userTopMargin == top &&
d->userRightMargin == right && d->userBottomMargin == bottom)
return;
d->userLeftMargin = left;
d->userTopMargin = top;
d->userRightMargin = right;
d->userBottomMargin = bottom;
invalidate();
}
/*!
\since 4.6
Sets the \a margins to use around the layout.
By default, QLayout uses the values provided by the style. On
most platforms, the margin is 11 pixels in all directions.
\sa contentsMargins()
*/
void QLayout::setContentsMargins(const QMargins &margins)
{
setContentsMargins(margins.left(), margins.top(), margins.right(), margins.bottom());
}
/*!
\since 4.3
Extracts the left, top, right, and bottom margins used around the
layout, and assigns them to *\a left, *\a top, *\a right, and *\a
bottom (unless they are null pointers).
By default, QLayout uses the values provided by the style. On
most platforms, the margin is 11 pixels in all directions.
\sa setContentsMargins(), QStyle::pixelMetric(),
{QStyle::}{PM_LayoutLeftMargin},
{QStyle::}{PM_LayoutTopMargin},
{QStyle::}{PM_LayoutRightMargin},
{QStyle::}{PM_LayoutBottomMargin}
*/
void QLayout::getContentsMargins(int *left, int *top, int *right, int *bottom) const
{
Q_D(const QLayout);
d->getMargin(left, d->userLeftMargin, QStyle::PM_LayoutLeftMargin);
d->getMargin(top, d->userTopMargin, QStyle::PM_LayoutTopMargin);
d->getMargin(right, d->userRightMargin, QStyle::PM_LayoutRightMargin);
d->getMargin(bottom, d->userBottomMargin, QStyle::PM_LayoutBottomMargin);
}
/*!
\since 4.6
Returns the margins used around the layout.
By default, QLayout uses the values provided by the style. On
most platforms, the margin is 11 pixels in all directions.
\sa setContentsMargins()
*/
QMargins QLayout::contentsMargins() const
{
int left, top, right, bottom;
getContentsMargins(&left, &top, &right, &bottom);
return QMargins(left, top, right, bottom);
}
/*!
\since 4.3
Returns the layout's geometry() rectangle, but taking into account the
contents margins.
\sa setContentsMargins(), getContentsMargins()
*/
QRect QLayout::contentsRect() const
{
Q_D(const QLayout);
int left, top, right, bottom;
getContentsMargins(&left, &top, &right, &bottom);
return d->rect.adjusted(+left, +top, -right, -bottom);
}
/*!
Returns the parent widget of this layout, or 0 if this layout is
not installed on any widget.
If the layout is a sub-layout, this function returns the parent
widget of the parent layout.
\sa parent()
*/
QWidget *QLayout::parentWidget() const
{
Q_D(const QLayout);
if (!d->topLevel) {
if (parent()) {
QLayout *parentLayout = qobject_cast<QLayout*>(parent());
if (!parentLayout) {
qWarning("QLayout::parentWidget: A layout can only have another layout as a parent.");
return 0;
}
return parentLayout->parentWidget();
} else {
return 0;
}
} else {
Q_ASSERT(parent() && parent()->isWidgetType());
return static_cast<QWidget *>(parent());
}
}
/*!
\reimp
*/
bool QLayout::isEmpty() const
{
int i = 0;
QLayoutItem *item = itemAt(i);
while (item) {
if (!item->isEmpty())
return false;
++i;
item = itemAt(i);
}
return true;
}
/*!
\reimp
*/
void QLayout::setGeometry(const QRect &r)
{
Q_D(QLayout);
d->rect = r;
}
/*!
\reimp
*/
QRect QLayout::geometry() const
{
Q_D(const QLayout);
return d->rect;
}
/*!
\reimp
*/
void QLayout::invalidate()
{
Q_D(QLayout);
d->rect = QRect();
update();
}
static bool removeWidgetRecursively(QLayoutItem *li, QWidget *w)
{
QLayout *lay = li->layout();
if (!lay)
return false;
int i = 0;
QLayoutItem *child;
while ((child = lay->itemAt(i))) {
if (child->widget() == w) {
delete lay->takeAt(i);
lay->invalidate();
return true;
} else if (removeWidgetRecursively(child, w)) {
return true;
} else {
++i;
}
}
return false;
}
void QLayoutPrivate::doResize(const QSize &r)
{
Q_Q(QLayout);
int mbh = menuBarHeightForWidth(menubar, r.width());
QWidget *mw = q->parentWidget();
QRect rect = mw->testAttribute(Qt::WA_LayoutOnEntireRect) ? mw->rect() : mw->contentsRect();
rect.setTop(rect.top() + mbh);
q->setGeometry(rect);
#ifndef QT_NO_MENUBAR
if (menubar)
menubar->setGeometry(0,0,r.width(), mbh);
#endif
}
/*!
\internal
Performs child widget layout when the parent widget is
resized. Also handles removal of widgets. \a e is the
event
*/
void QLayout::widgetEvent(QEvent *e)
{
Q_D(QLayout);
if (!d->enabled)
return;
switch (e->type()) {
case QEvent::Resize:
if (d->activated) {
QResizeEvent *r = (QResizeEvent *)e;
d->doResize(r->size());
} else {
activate();
}
break;
case QEvent::ChildRemoved:
{
QChildEvent *c = (QChildEvent *)e;
if (c->child()->isWidgetType()) {
QWidget *w = (QWidget *)c->child();
#ifndef QT_NO_MENUBAR
if (w == d->menubar)
d->menubar = 0;
#endif
removeWidgetRecursively(this, w);
}
}
break;
case QEvent::LayoutRequest:
if (static_cast<QWidget *>(parent())->isVisible())
activate();
break;
default:
break;
}
}
/*!
\reimp
*/
void QLayout::childEvent(QChildEvent *e)
{
Q_D(QLayout);
if (!d->enabled)
return;
if (e->type() == QEvent::ChildRemoved) {
QChildEvent *c = (QChildEvent*)e;
int i = 0;
QLayoutItem *item;
while ((item = itemAt(i))) {
if (item == static_cast<QLayout*>(c->child())) {
takeAt(i);
invalidate();
break;
} else {
++i;
}
}
}
}
/*!
\internal
Also takes contentsMargins and menu bar into account.
*/
int QLayout::totalHeightForWidth(int w) const
{
Q_D(const QLayout);
int side=0, top=0;
if (d->topLevel) {
QWidget *parent = parentWidget();
parent->ensurePolished();
QWidgetPrivate *wd = parent->d_func();
side += wd->leftmargin + wd->rightmargin;
top += wd->topmargin + wd->bottommargin;
}
int h = heightForWidth(w - side) + top;
#ifndef QT_NO_MENUBAR
h += menuBarHeightForWidth(d->menubar, w);
#endif
return h;
}
/*!
\internal
Also takes contentsMargins and menu bar into account.
*/
QSize QLayout::totalMinimumSize() const
{
Q_D(const QLayout);
int side=0, top=0;
if (d->topLevel) {
QWidget *pw = parentWidget();
pw->ensurePolished();
QWidgetPrivate *wd = pw->d_func();
side += wd->leftmargin + wd->rightmargin;
top += wd->topmargin + wd->bottommargin;
}
QSize s = minimumSize();
#ifndef QT_NO_MENUBAR
top += menuBarHeightForWidth(d->menubar, s.width() + side);
#endif
return s + QSize(side, top);
}
/*!
\internal
Also takes contentsMargins and menu bar into account.
*/
QSize QLayout::totalSizeHint() const
{
Q_D(const QLayout);
int side=0, top=0;
if (d->topLevel) {
QWidget *pw = parentWidget();
pw->ensurePolished();
QWidgetPrivate *wd = pw->d_func();
side += wd->leftmargin + wd->rightmargin;
top += wd->topmargin + wd->bottommargin;
}
QSize s = sizeHint();
if (hasHeightForWidth())
s.setHeight(heightForWidth(s.width() + side));
#ifndef QT_NO_MENUBAR
top += menuBarHeightForWidth(d->menubar, s.width());
#endif
return s + QSize(side, top);
}
/*!
\internal
Also takes contentsMargins and menu bar into account.
*/
QSize QLayout::totalMaximumSize() const
{
Q_D(const QLayout);
int side=0, top=0;
if (d->topLevel) {
QWidget *pw = parentWidget();
pw->ensurePolished();
QWidgetPrivate *wd = pw->d_func();
side += wd->leftmargin + wd->rightmargin;
top += wd->topmargin + wd->bottommargin;
}
QSize s = maximumSize();
#ifndef QT_NO_MENUBAR
top += menuBarHeightForWidth(d->menubar, s.width());
#endif
if (d->topLevel)
s = QSize(qMin(s.width() + side, QLAYOUTSIZE_MAX),
qMin(s.height() + top, QLAYOUTSIZE_MAX));
return s;
}
/*!
\internal
Destroys the layout, deleting all child layouts.
Geometry management stops when a top-level layout is deleted.
The layout classes will probably be fatally confused if you delete
a sublayout.
*/
QLayout::~QLayout()
{
Q_D(QLayout);
/*
This function may be called during the QObject destructor,
when the parent no longer is a QWidget.
*/
if (d->topLevel && parent() && parent()->isWidgetType() &&
((QWidget*)parent())->layout() == this)
((QWidget*)parent())->d_func()->layout = 0;
}
/*!
This function is called from \c addLayout() or \c insertLayout() functions in
subclasses to add layout \a l as a sub-layout.
The only scenario in which you need to call it directly is if you
implement a custom layout that supports nested layouts.
\sa QBoxLayout::addLayout(), QBoxLayout::insertLayout(), QGridLayout::addLayout()
*/
void QLayout::addChildLayout(QLayout *l)
{
if (l->parent()) {
qWarning("QLayout::addChildLayout: layout \"%s\" already has a parent",
l->objectName().toLocal8Bit().data());
return;
}
l->setParent(this);
if (QWidget *mw = parentWidget()) {
l->d_func()->reparentChildWidgets(mw);
}
}
/*!
\internal
*/
bool QLayout::adoptLayout(QLayout *layout)
{
const bool ok = !layout->parent();
addChildLayout(layout);
return ok;
}
#ifdef QT_DEBUG
static bool layoutDebug()
{
static int checked_env = -1;
if(checked_env == -1)
checked_env = !!qgetenv("QT_LAYOUT_DEBUG").toInt();
return checked_env;
}
#endif
void QLayoutPrivate::reparentChildWidgets(QWidget *mw)
{
Q_Q(QLayout);
int n = q->count();
#ifndef QT_NO_MENUBAR
if (menubar && menubar->parentWidget() != mw) {
menubar->setParent(mw);
}
#endif
bool mwVisible = mw && mw->isVisible();
for (int i = 0; i < n; ++i) {
QLayoutItem *item = q->itemAt(i);
if (QWidget *w = item->widget()) {
QWidget *pw = w->parentWidget();
#ifdef QT_DEBUG
if (pw && pw != mw && layoutDebug()) {
qWarning("QLayout::addChildLayout: widget %s \"%s\" in wrong parent; moved to correct parent",
w->metaObject()->className(), w->objectName().toLocal8Bit().data());
}
#endif
bool needShow = mwVisible && !(w->isHidden() && w->testAttribute(Qt::WA_WState_ExplicitShowHide));
if (pw != mw)
w->setParent(mw);
if (needShow)
QMetaObject::invokeMethod(w, "_q_showIfNotHidden", Qt::QueuedConnection); //show later
} else if (QLayout *l = item->layout()) {
l->d_func()->reparentChildWidgets(mw);
}
}
}
/*!
This function is called from \c addWidget() functions in
subclasses to add \a w as a managed widget of a layout.
If \a w is already managed by a layout, this function will give a warning
and remove \a w from that layout. This function must therefore be
called before adding \a w to the layout's data structure.
*/
void QLayout::addChildWidget(QWidget *w)
{
QWidget *mw = parentWidget();
QWidget *pw = w->parentWidget();
//Qt::WA_LaidOut is never reset. It only means that the widget at some point has
//been in a layout.
if (pw && w->testAttribute(Qt::WA_LaidOut)) {
QLayout *l = pw->layout();
if (l && removeWidgetRecursively(l, w)) {
#ifdef QT_DEBUG
if (layoutDebug())
qWarning("QLayout::addChildWidget: %s \"%s\" is already in a layout; moved to new layout",
w->metaObject()->className(), w->objectName().toLocal8Bit().data());
#endif
}
}
if (pw && mw && pw != mw) {
#ifdef QT_DEBUG
if (layoutDebug())
qWarning("QLayout::addChildWidget: %s \"%s\" in wrong parent; moved to correct parent",
w->metaObject()->className(), w->objectName().toLocal8Bit().data());
#endif
pw = 0;
}
bool needShow = mw && mw->isVisible() && !(w->isHidden() && w->testAttribute(Qt::WA_WState_ExplicitShowHide));
if (!pw && mw)
w->setParent(mw);
w->setAttribute(Qt::WA_LaidOut);
if (needShow)
QMetaObject::invokeMethod(w, "_q_showIfNotHidden", Qt::QueuedConnection); //show later
}
/*!
Tells the geometry manager to place the menu bar \a widget at the
top of parentWidget(), outside QWidget::contentsMargins(). All
child widgets are placed below the bottom edge of the menu bar.
*/
void QLayout::setMenuBar(QWidget *widget)
{
Q_D(QLayout);
if (widget)
addChildWidget(widget);
d->menubar = widget;
}
/*!
Returns the menu bar set for this layout, or 0 if no menu bar is
set.
*/
QWidget *QLayout::menuBar() const
{
Q_D(const QLayout);
return d->menubar;
}
/*!
Returns the minimum size of this layout. This is the smallest
size that the layout can have while still respecting the
specifications.
The returned value doesn't include the space required by
QWidget::setContentsMargins() or menuBar().
The default implementation allows unlimited resizing.
*/
QSize QLayout::minimumSize() const
{
return QSize(0, 0);
}
/*!
Returns the maximum size of this layout. This is the largest size
that the layout can have while still respecting the
specifications.
The returned value doesn't include the space required by
QWidget::setContentsMargins() or menuBar().
The default implementation allows unlimited resizing.
*/
QSize QLayout::maximumSize() const
{
return QSize(QLAYOUTSIZE_MAX, QLAYOUTSIZE_MAX);
}
/*!
Returns whether this layout can make use of more space than
sizeHint(). A value of Qt::Vertical or Qt::Horizontal means that
it wants to grow in only one dimension, whereas Qt::Vertical |
Qt::Horizontal means that it wants to grow in both dimensions.
The default implementation returns Qt::Horizontal | Qt::Vertical.
Subclasses reimplement it to return a meaningful value based on
their child widgets's \l{QSizePolicy}{size policies}.
\sa sizeHint()
*/
Qt::Orientations QLayout::expandingDirections() const
{
return Qt::Horizontal | Qt::Vertical;
}
void QLayout::activateRecursiveHelper(QLayoutItem *item)
{
item->invalidate();
QLayout *layout = item->layout();
if (layout) {
QLayoutItem *child;
int i=0;
while ((child = layout->itemAt(i++)))
activateRecursiveHelper(child);
layout->d_func()->activated = true;
}
}
/*!
Updates the layout for parentWidget().
You should generally not need to call this because it is
automatically called at the most appropriate times.
\sa activate(), invalidate()
*/
void QLayout::update()
{
QLayout *layout = this;
while (layout && layout->d_func()->activated) {
layout->d_func()->activated = false;
if (layout->d_func()->topLevel) {
Q_ASSERT(layout->parent()->isWidgetType());
QWidget *mw = static_cast<QWidget*>(layout->parent());
QApplication::postEvent(mw, new QEvent(QEvent::LayoutRequest));
break;
}
layout = static_cast<QLayout*>(layout->parent());
}
}
/*!
Redoes the layout for parentWidget() if necessary.
You should generally not need to call this because it is
automatically called at the most appropriate times. It returns
true if the layout was redone.
\sa update(), QWidget::updateGeometry()
*/
bool QLayout::activate()
{
Q_D(QLayout);
if (!d->enabled || !parent())
return false;
if (!d->topLevel)
return static_cast<QLayout*>(parent())->activate();
if (d->activated)
return false;
QWidget *mw = static_cast<QWidget*>(parent());
if (mw == 0) {
qWarning("QLayout::activate: %s \"%s\" does not have a main widget",
QObject::metaObject()->className(), QObject::objectName().toLocal8Bit().data());
return false;
}
activateRecursiveHelper(this);
QWidgetPrivate *md = mw->d_func();
uint explMin = md->extra ? md->extra->explicitMinSize : 0;
uint explMax = md->extra ? md->extra->explicitMaxSize : 0;
switch (d->constraint) {
case SetFixedSize:
// will trigger resize
mw->setFixedSize(totalSizeHint());
break;
case SetMinimumSize:
mw->setMinimumSize(totalMinimumSize());
break;
case SetMaximumSize:
mw->setMaximumSize(totalMaximumSize());
break;
case SetMinAndMaxSize:
mw->setMinimumSize(totalMinimumSize());
mw->setMaximumSize(totalMaximumSize());
break;
case SetDefaultConstraint: {
bool widthSet = explMin & Qt::Horizontal;
bool heightSet = explMin & Qt::Vertical;
if (mw->isWindow()) {
QSize ms = totalMinimumSize();
if (widthSet)
ms.setWidth(mw->minimumSize().width());
if (heightSet)
ms.setHeight(mw->minimumSize().height());
if ((!heightSet || !widthSet) && hasHeightForWidth()) {
int h = minimumHeightForWidth(ms.width());
if (h > ms.height()) {
if (!heightSet)
ms.setHeight(0);
if (!widthSet)
ms.setWidth(0);
}
}
mw->setMinimumSize(ms);
} else if (!widthSet || !heightSet) {
QSize ms = mw->minimumSize();
if (!widthSet)
ms.setWidth(0);
if (!heightSet)
ms.setHeight(0);
mw->setMinimumSize(ms);
}
break;
}
case SetNoConstraint:
break;
}
d->doResize(mw->size());
if (md->extra) {
md->extra->explicitMinSize = explMin;
md->extra->explicitMaxSize = explMax;
}
// ideally only if sizeHint() or sizePolicy() has changed
mw->updateGeometry();
return true;
}
/*!
\fn QLayoutItem *QLayout::itemAt(int index) const
Must be implemented in subclasses to return the layout item at \a
index. If there is no such item, the function must return 0.
Items are numbered consecutively from 0. If an item is deleted, other items will be renumbered.
This function can be used to iterate over a layout. The following
code will draw a rectangle for each layout item in the layout structure of the widget.
\snippet doc/src/snippets/code/src_gui_kernel_qlayout.cpp 0
\sa count(), takeAt()
*/
/*!
\fn QLayoutItem *QLayout::takeAt(int index)
Must be implemented in subclasses to remove the layout item at \a
index from the layout, and return the item. If there is no such
item, the function must do nothing and return 0. Items are numbered
consecutively from 0. If an item is removed, other items will be
renumbered.
The following code fragment shows a safe way to remove all items
from a layout:
\snippet doc/src/snippets/code/src_gui_kernel_qlayout.cpp 1
\sa itemAt(), count()
*/
/*!
\fn int *QLayout::count() const
Must be implemented in subclasses to return the number of items
in the layout.
\sa itemAt()
*/
/*!
Searches for widget \a widget in this layout (not including child
layouts).
Returns the index of \a widget, or -1 if \a widget is not found.
The default implementation iterates over all items using itemAt()
*/
int QLayout::indexOf(QWidget *widget) const
{
int i = 0;
QLayoutItem *item = itemAt(i);
while (item) {
if (item->widget() == widget)
return i;
++i;
item = itemAt(i);
}
return -1;
}
/*!
\enum QLayout::SizeConstraint
The possible values are:
\value SetDefaultConstraint The main widget's minimum size is set
to minimumSize(), unless the widget already has
a minimum size.
\value SetFixedSize The main widget's size is set to sizeHint(); it
cannot be resized at all.
\value SetMinimumSize The main widget's minimum size is set to
minimumSize(); it cannot be smaller.
\value SetMaximumSize The main widget's maximum size is set to
maximumSize(); it cannot be larger.
\value SetMinAndMaxSize The main widget's minimum size is set to
minimumSize() and its maximum size is set to
maximumSize().
\value SetNoConstraint The widget is not constrained.
\omitvalue Auto
\omitvalue FreeResize
\omitvalue Minimum
\omitvalue Fixed
\sa setSizeConstraint()
*/
/*!
\property QLayout::sizeConstraint
\brief the resize mode of the layout
The default mode is \l {QLayout::SetDefaultConstraint}
{SetDefaultConstraint}.
*/
void QLayout::setSizeConstraint(SizeConstraint constraint)
{
Q_D(QLayout);
if (constraint == d->constraint)
return;
d->constraint = constraint;
invalidate();
}
QLayout::SizeConstraint QLayout::sizeConstraint() const
{
Q_D(const QLayout);
return d->constraint;
}
/*!
Returns the rectangle that should be covered when the geometry of
this layout is set to \a r, provided that this layout supports
setAlignment().
The result is derived from sizeHint() and expanding(). It is never
larger than \a r.
*/
QRect QLayout::alignmentRect(const QRect &r) const
{
QSize s = sizeHint();
Qt::Alignment a = alignment();
/*
This is a hack to obtain the real maximum size, not
QSize(QLAYOUTSIZE_MAX, QLAYOUTSIZE_MAX), the value consistently
returned by QLayoutItems that have an alignment.
*/
QLayout *that = const_cast<QLayout *>(this);
that->setAlignment(0);
QSize ms = that->maximumSize();
that->setAlignment(a);
if ((expandingDirections() & Qt::Horizontal) ||
!(a & Qt::AlignHorizontal_Mask)) {
s.setWidth(qMin(r.width(), ms.width()));
}
if ((expandingDirections() & Qt::Vertical) ||
!(a & Qt::AlignVertical_Mask)) {
s.setHeight(qMin(r.height(), ms.height()));
} else if (hasHeightForWidth()) {
int hfw = heightForWidth(s.width());
if (hfw < s.height())
s.setHeight(qMin(hfw, ms.height()));
}
s = s.boundedTo(r.size());
int x = r.x();
int y = r.y();
if (a & Qt::AlignBottom)
y += (r.height() - s.height());
else if (!(a & Qt::AlignTop))
y += (r.height() - s.height()) / 2;
QWidget *parent = parentWidget();
a = QStyle::visualAlignment(parent ? parent->layoutDirection() : QApplication::layoutDirection(), a);
if (a & Qt::AlignRight)
x += (r.width() - s.width());
else if (!(a & Qt::AlignLeft))
x += (r.width() - s.width()) / 2;
return QRect(x, y, s.width(), s.height());
}
/*!
Removes the widget \a widget from the layout. After this call, it
is the caller's responsibility to give the widget a reasonable
geometry or to put the widget back into a layout.
\bold{Note:} The ownership of \a widget remains the same as
when it was added.
\sa removeItem(), QWidget::setGeometry(), addWidget()
*/
void QLayout::removeWidget(QWidget *widget)
{
int i = 0;
QLayoutItem *child;
while ((child = itemAt(i))) {
if (child->widget() == widget) {
delete takeAt(i);
invalidate();
} else {
++i;
}
}
}
/*!
Removes the layout item \a item from the layout. It is the
caller's responsibility to delete the item.
Notice that \a item can be a layout (since QLayout inherits
QLayoutItem).
\sa removeWidget(), addItem()
*/
void QLayout::removeItem(QLayoutItem *item)
{
int i = 0;
QLayoutItem *child;
while ((child = itemAt(i))) {
if (child == item) {
takeAt(i);
invalidate();
} else {
++i;
}
}
}
/*!
Enables this layout if \a enable is true, otherwise disables it.
An enabled layout adjusts dynamically to changes; a disabled
layout acts as if it did not exist.
By default all layouts are enabled.
\sa isEnabled()
*/
void QLayout::setEnabled(bool enable)
{
Q_D(QLayout);
d->enabled = enable;
}
/*!
Returns true if the layout is enabled; otherwise returns false.
\sa setEnabled()
*/
bool QLayout::isEnabled() const
{
Q_D(const QLayout);
return d->enabled;
}
/*!
Returns a size that satisfies all size constraints on \a widget,
including heightForWidth() and that is as close as possible to \a
size.
*/
QSize QLayout::closestAcceptableSize(const QWidget *widget, const QSize &size)
{
QSize result = size.boundedTo(qSmartMaxSize(widget));
result = result.expandedTo(qSmartMinSize(widget));
QLayout *l = widget->layout();
if (l && l->hasHeightForWidth() && result.height() < l->minimumHeightForWidth(result.width()) ) {
QSize current = widget->size();
int currentHfw = l->minimumHeightForWidth(current.width());
int newHfw = l->minimumHeightForWidth(result.width());
if (current.height() < currentHfw || currentHfw == newHfw) {
//handle the constant hfw case and the vertical-only case, as well as the
// current-size-is-not-correct case
result.setHeight(newHfw);
} else {
// binary search; assume hfw is decreasing ###
int maxw = qMax(widget->width(),result.width());
int maxh = qMax(widget->height(), result.height());
int minw = qMin(widget->width(),result.width());
int minh = qMin(widget->height(), result.height());
int minhfw = l->minimumHeightForWidth(minw);
int maxhfw = l->minimumHeightForWidth(maxw);
while (minw < maxw) {
if (minhfw > maxh) { //assume decreasing
minw = maxw - (maxw-minw)/2;
minhfw = l->minimumHeightForWidth(minw);
} else if (maxhfw < minh ) { //assume decreasing
maxw = minw + (maxw-minw)/2;
maxhfw = l->minimumHeightForWidth(maxw);
} else {
break;
}
}
result = result.expandedTo(QSize(minw, minhfw));
}
}
return result;
}
/*!
\fn void QLayout::setResizeMode(SizeConstraint constraint)
Use setSizeConstraint(\a constraint) instead.
*/
/*!
\fn QLayout::SizeConstraint QLayout::resizeMode() const
Use sizeConstraint() instead.
*/
void QSizePolicy::setControlType(ControlType type)
{
/*
The control type is a flag type, with values 0x1, 0x2, 0x4, 0x8, 0x10,
etc. In memory, we pack it onto the available bits (CTSize) in
setControlType(), and unpack it here.
Example:
0x00000001 maps to 0x00000000
0x00000002 maps to 0x00000200
0x00000004 maps to 0x00000400
0x00000008 maps to 0x00000600
etc.
*/
int i = 0;
while (true) {
if (type & (0x1 << i)) {
data = (data & ~CTMask) | (i << CTShift);
return;
}
++i;
}
}
QSizePolicy::ControlType QSizePolicy::controlType() const
{
return QSizePolicy::ControlType(0x1 << ((data & CTMask) >> CTShift));
}
#ifndef QT_NO_DATASTREAM
/*!
\relates QSizePolicy
\since 4.2
Writes the size \a policy to the data stream \a stream.
\sa \link datastreamformat.html Format of the QDataStream operators \endlink
*/
QDataStream &operator<<(QDataStream &stream, const QSizePolicy &policy)
{
return stream << policy.data;
}
/*!
\relates QSizePolicy
\since 4.2
Reads the size \a policy from the data stream \a stream.
\sa \link datastreamformat.html Format of the QDataStream operators \endlink
*/
QDataStream &operator>>(QDataStream &stream, QSizePolicy &policy)
{
return stream >> policy.data;
}
#endif // QT_NO_DATASTREAM
QT_END_NAMESPACE
#include "moc_qlayout.h"
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