Katana_mirror/katie
1
0
Fork 0
mirror of https://bitbucket.org/smil3y/katie.git synced 2025-02-27 04:13:08 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions
katie/src/gui/kernel/qboxlayout.cpp
Ivailo Monev b0cbbe9318 mostly mac leftovers removal 
Signed-off-by: Ivailo Monev <xakepa10@laimg.moc>
2016-09-19 18:25:25 +00:00

1277 lines
36 KiB
C++
Raw Blame History

/****************************************************************************
**
** 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 "qboxlayout.h"
#include "qapplication.h"
#include "qwidget.h"
#include "qlist.h"
#include "qsizepolicy.h"
#include "qvector.h"
#include "qlayoutengine_p.h"
#include "qlayout_p.h"
QT_BEGIN_NAMESPACE
struct QBoxLayoutItem
{
QBoxLayoutItem(QLayoutItem *it, int stretch_ = 0)
: item(it), stretch(stretch_), magic(false) { }
~QBoxLayoutItem() { delete item; }
int hfw(int w) {
if (item->hasHeightForWidth()) {
return item->heightForWidth(w);
} else {
return item->sizeHint().height();
}
}
int mhfw(int w) {
if (item->hasHeightForWidth()) {
return item->heightForWidth(w);
} else {
return item->minimumSize().height();
}
}
int hStretch() {
if (stretch == 0 && item->widget()) {
return item->widget()->sizePolicy().horizontalStretch();
} else {
return stretch;
}
}
int vStretch() {
if (stretch == 0 && item->widget()) {
return item->widget()->sizePolicy().verticalStretch();
} else {
return stretch;
}
}
QLayoutItem *item;
int stretch;
bool magic;
};
class QBoxLayoutPrivate : public QLayoutPrivate
{
Q_DECLARE_PUBLIC(QBoxLayout)
public:
QBoxLayoutPrivate() : hfwWidth(-1), dirty(true), spacing(-1) { }
~QBoxLayoutPrivate();
void setDirty() {
geomArray.clear();
hfwWidth = -1;
hfwHeight = -1;
dirty = true;
}
QList<QBoxLayoutItem *> list;
QVector<QLayoutStruct> geomArray;
int hfwWidth;
int hfwHeight;
int hfwMinHeight;
QSize sizeHint;
QSize minSize;
QSize maxSize;
int leftMargin, topMargin, rightMargin, bottomMargin;
Qt::Orientations expanding;
uint hasHfw : 1;
uint dirty : 1;
QBoxLayout::Direction dir;
int spacing;
inline void deleteAll() { while (!list.isEmpty()) delete list.takeFirst(); }
void setupGeom();
void calcHfw(int);
void effectiveMargins(int *left, int *top, int *right, int *bottom) const;
};
QBoxLayoutPrivate::~QBoxLayoutPrivate()
{
}
static inline bool horz(QBoxLayout::Direction dir)
{
return dir == QBoxLayout::RightToLeft || dir == QBoxLayout::LeftToRight;
}
/**
* The purpose of this function is to make sure that widgets are not laid out outside its layout.
* E.g. the layoutItemRect margins are only meant to take of the surrounding margins/spacings.
* However, if the margin is 0, it can easily cover the area of a widget above it.
*/
void QBoxLayoutPrivate::effectiveMargins(int *left, int *top, int *right, int *bottom) const
{
if (left)
*left = leftMargin;
if (top)
*top = topMargin;
if (right)
*right = rightMargin;
if (bottom)
*bottom = bottomMargin;
}
/*
Initializes the data structure needed by qGeomCalc and
recalculates max/min and size hint.
*/
void QBoxLayoutPrivate::setupGeom()
{
if (!dirty)
return;
Q_Q(QBoxLayout);
int maxw = horz(dir) ? 0 : QLAYOUTSIZE_MAX;
int maxh = horz(dir) ? QLAYOUTSIZE_MAX : 0;
int minw = 0;
int minh = 0;
int hintw = 0;
int hinth = 0;
bool horexp = false;
bool verexp = false;
hasHfw = false;
int n = list.count();
geomArray.clear();
QVector<QLayoutStruct> a(n);
QSizePolicy::ControlTypes controlTypes1;
QSizePolicy::ControlTypes controlTypes2;
int fixedSpacing = q->spacing();
int previousNonEmptyIndex = -1;
QStyle *style = 0;
if (fixedSpacing < 0) {
if (QWidget *parentWidget = q->parentWidget())
style = parentWidget->style();
}
for (int i = 0; i < n; i++) {
QBoxLayoutItem *box = list.at(i);
QSize max = box->item->maximumSize();
QSize min = box->item->minimumSize();
QSize hint = box->item->sizeHint();
Qt::Orientations exp = box->item->expandingDirections();
bool empty = box->item->isEmpty();
int spacing = 0;
if (!empty) {
if (fixedSpacing >= 0) {
spacing = (previousNonEmptyIndex >= 0) ? fixedSpacing : 0;
} else {
controlTypes1 = controlTypes2;
controlTypes2 = box->item->controlTypes();
if (previousNonEmptyIndex >= 0) {
QSizePolicy::ControlTypes actual1 = controlTypes1;
QSizePolicy::ControlTypes actual2 = controlTypes2;
if (dir == QBoxLayout::RightToLeft || dir == QBoxLayout::BottomToTop)
qSwap(actual1, actual2);
if (style) {
spacing = style->combinedLayoutSpacing(actual1, actual2,
horz(dir) ? Qt::Horizontal : Qt::Vertical,
0, q->parentWidget());
if (spacing < 0)
spacing = 0;
}
}
}
if (previousNonEmptyIndex >= 0)
a[previousNonEmptyIndex].spacing = spacing;
previousNonEmptyIndex = i;
}
bool ignore = empty && box->item->widget(); // ignore hidden widgets
bool dummy = true;
if (horz(dir)) {
bool expand = (exp & Qt::Horizontal || box->stretch > 0);
horexp = horexp || expand;
maxw += spacing + max.width();
minw += spacing + min.width();
hintw += spacing + hint.width();
if (!ignore)
qMaxExpCalc(maxh, verexp, dummy,
max.height(), exp & Qt::Vertical, box->item->isEmpty());
minh = qMax(minh, min.height());
hinth = qMax(hinth, hint.height());
a[i].sizeHint = hint.width();
a[i].maximumSize = max.width();
a[i].minimumSize = min.width();
a[i].expansive = expand;
a[i].stretch = box->stretch ? box->stretch : box->hStretch();
} else {
bool expand = (exp & Qt::Vertical || box->stretch > 0);
verexp = verexp || expand;
maxh += spacing + max.height();
minh += spacing + min.height();
hinth += spacing + hint.height();
if (!ignore)
qMaxExpCalc(maxw, horexp, dummy,
max.width(), exp & Qt::Horizontal, box->item->isEmpty());
minw = qMax(minw, min.width());
hintw = qMax(hintw, hint.width());
a[i].sizeHint = hint.height();
a[i].maximumSize = max.height();
a[i].minimumSize = min.height();
a[i].expansive = expand;
a[i].stretch = box->stretch ? box->stretch : box->vStretch();
}
a[i].empty = empty;
a[i].spacing = 0; // might be be initialized with a non-zero value in a later iteration
hasHfw = hasHfw || box->item->hasHeightForWidth();
}
geomArray = a;
expanding = (Qt::Orientations)
((horexp ? Qt::Horizontal : 0)
| (verexp ? Qt::Vertical : 0));
minSize = QSize(minw, minh);
maxSize = QSize(maxw, maxh).expandedTo(minSize);
sizeHint = QSize(hintw, hinth).expandedTo(minSize).boundedTo(maxSize);
q->getContentsMargins(&leftMargin, &topMargin, &rightMargin, &bottomMargin);
int left, top, right, bottom;
effectiveMargins(&left, &top, &right, &bottom);
QSize extra(left + right, top + bottom);
minSize += extra;
maxSize += extra;
sizeHint += extra;
dirty = false;
}
/*
Calculates and stores the preferred height given the width \a w.
*/
void QBoxLayoutPrivate::calcHfw(int w)
{
QVector<QLayoutStruct> &a = geomArray;
int n = a.count();
int h = 0;
int mh = 0;
Q_ASSERT(n == list.size());
if (horz(dir)) {
qGeomCalc(a, 0, n, 0, w);
for (int i = 0; i < n; i++) {
QBoxLayoutItem *box = list.at(i);
h = qMax(h, box->hfw(a.at(i).size));
mh = qMax(mh, box->mhfw(a.at(i).size));
}
} else {
for (int i = 0; i < n; ++i) {
QBoxLayoutItem *box = list.at(i);
int spacing = a.at(i).spacing;
h += box->hfw(w);
mh += box->mhfw(w);
h += spacing;
mh += spacing;
}
}
hfwWidth = w;
hfwHeight = h;
hfwMinHeight = mh;
}
/*!
\class QBoxLayout
\brief The QBoxLayout class lines up child widgets horizontally or
vertically.
\ingroup geomanagement
QBoxLayout takes the space it gets (from its parent layout or from
the parentWidget()), divides it up into a row of boxes, and makes
each managed widget fill one box.
\image qhboxlayout-with-5-children.png Horizontal box layout with five child widgets
If the QBoxLayout's orientation is Qt::Horizontal the boxes are
placed in a row, with suitable sizes. Each widget (or other box)
will get at least its minimum size and at most its maximum size.
Any excess space is shared according to the stretch factors (more
about that below).
\image qvboxlayout-with-5-children.png Vertical box layout with five child widgets
If the QBoxLayout's orientation is Qt::Vertical, the boxes are
placed in a column, again with suitable sizes.
The easiest way to create a QBoxLayout is to use one of the
convenience classes, e.g. QHBoxLayout (for Qt::Horizontal boxes)
or QVBoxLayout (for Qt::Vertical boxes). You can also use the
QBoxLayout constructor directly, specifying its direction as
LeftToRight, RightToLeft, TopToBottom, or BottomToTop.
If the QBoxLayout is not the top-level layout (i.e. it is not
managing all of the widget's area and children), you must add it
to its parent layout before you can do anything with it. The
normal way to add a layout is by calling
parentLayout-\>addLayout().
Once you have done this, you can add boxes to the QBoxLayout using
one of four functions:
\list
\o addWidget() to add a widget to the QBoxLayout and set the
widget's stretch factor. (The stretch factor is along the row of
boxes.)
\o addSpacing() to create an empty box; this is one of the
functions you use to create nice and spacious dialogs. See below
for ways to set margins.
\o addStretch() to create an empty, stretchable box.
\o addLayout() to add a box containing another QLayout to the row
and set that layout's stretch factor.
\endlist
Use insertWidget(), insertSpacing(), insertStretch() or
insertLayout() to insert a box at a specified position in the
layout.
QBoxLayout also includes two margin widths:
\list
\o setContentsMargins() sets the width of the outer border on
each side of the widget. This is the width of the reserved space
along each of the QBoxLayout's four sides.
\o setSpacing() sets the width between neighboring boxes. (You
can use addSpacing() to get more space at a particular spot.)
\endlist
The margin default is provided by the style. The default margin
most Qt styles specify is 9 for child widgets and 11 for windows.
The spacing defaults to the same as the margin width for a
top-level layout, or to the same as the parent layout.
To remove a widget from a layout, call removeWidget(). Calling
QWidget::hide() on a widget also effectively removes the widget
from the layout until QWidget::show() is called.
You will almost always want to use QVBoxLayout and QHBoxLayout
rather than QBoxLayout because of their convenient constructors.
\sa QGridLayout, QStackedLayout, {Layout Management}
*/
/*!
\enum QBoxLayout::Direction
This type is used to determine the direction of a box layout.
\value LeftToRight Horizontal from left to right.
\value RightToLeft Horizontal from right to left.
\value TopToBottom Vertical from top to bottom.
\value BottomToTop Vertical from bottom to top.
\omitvalue Down
\omitvalue Up
*/
/*!
Constructs a new QBoxLayout with direction \a dir and parent widget \a
parent.
\sa direction()
*/
QBoxLayout::QBoxLayout(Direction dir, QWidget *parent)
: QLayout(*new QBoxLayoutPrivate, 0, parent)
{
Q_D(QBoxLayout);
d->dir = dir;
}
/*!
Destroys this box layout.
The layout's widgets aren't destroyed.
*/
QBoxLayout::~QBoxLayout()
{
Q_D(QBoxLayout);
d->deleteAll(); // must do it before QObject deletes children, so can't be in ~QBoxLayoutPrivate
}
/*!
Reimplements QLayout::spacing(). If the spacing property is
valid, that value is returned. Otherwise, a value for the spacing
property is computed and returned. Since layout spacing in a widget
is style dependent, if the parent is a widget, it queries the style
for the (horizontal or vertical) spacing of the layout. Otherwise,
the parent is a layout, and it queries the parent layout for the
spacing().
\sa QLayout::spacing(), setSpacing()
*/
int QBoxLayout::spacing() const
{
Q_D(const QBoxLayout);
if (d->spacing >=0) {
return d->spacing;
} else {
return qSmartSpacing(this, d->dir == LeftToRight || d->dir == RightToLeft
? QStyle::PM_LayoutHorizontalSpacing
: QStyle::PM_LayoutVerticalSpacing);
}
}
/*!
Reimplements QLayout::setSpacing(). Sets the spacing
property to \a spacing.
\sa QLayout::setSpacing(), spacing()
*/
void QBoxLayout::setSpacing(int spacing)
{
Q_D(QBoxLayout);
d->spacing = spacing;
invalidate();
}
/*!
\reimp
*/
QSize QBoxLayout::sizeHint() const
{
Q_D(const QBoxLayout);
if (d->dirty)
const_cast<QBoxLayout*>(this)->d_func()->setupGeom();
return d->sizeHint;
}
/*!
\reimp
*/
QSize QBoxLayout::minimumSize() const
{
Q_D(const QBoxLayout);
if (d->dirty)
const_cast<QBoxLayout*>(this)->d_func()->setupGeom();
return d->minSize;
}
/*!
\reimp
*/
QSize QBoxLayout::maximumSize() const
{
Q_D(const QBoxLayout);
if (d->dirty)
const_cast<QBoxLayout*>(this)->d_func()->setupGeom();
QSize s = d->maxSize.boundedTo(QSize(QLAYOUTSIZE_MAX, QLAYOUTSIZE_MAX));
if (alignment() & Qt::AlignHorizontal_Mask)
s.setWidth(QLAYOUTSIZE_MAX);
if (alignment() & Qt::AlignVertical_Mask)
s.setHeight(QLAYOUTSIZE_MAX);
return s;
}
/*!
\reimp
*/
bool QBoxLayout::hasHeightForWidth() const
{
Q_D(const QBoxLayout);
if (d->dirty)
const_cast<QBoxLayout*>(this)->d_func()->setupGeom();
return d->hasHfw;
}
/*!
\reimp
*/
int QBoxLayout::heightForWidth(int w) const
{
Q_D(const QBoxLayout);
if (!hasHeightForWidth())
return -1;
int left, top, right, bottom;
d->effectiveMargins(&left, &top, &right, &bottom);
w -= left + right;
if (w != d->hfwWidth)
const_cast<QBoxLayout*>(this)->d_func()->calcHfw(w);
return d->hfwHeight + top + bottom;
}
/*!
\reimp
*/
int QBoxLayout::minimumHeightForWidth(int w) const
{
Q_D(const QBoxLayout);
(void) heightForWidth(w);
int top, bottom;
d->effectiveMargins(0, &top, 0, &bottom);
return d->hasHfw ? (d->hfwMinHeight + top + bottom) : -1;
}
/*!
Resets cached information.
*/
void QBoxLayout::invalidate()
{
Q_D(QBoxLayout);
d->setDirty();
QLayout::invalidate();
}
/*!
\reimp
*/
int QBoxLayout::count() const
{
Q_D(const QBoxLayout);
return d->list.count();
}
/*!
\reimp
*/
QLayoutItem *QBoxLayout::itemAt(int index) const
{
Q_D(const QBoxLayout);
return index >= 0 && index < d->list.count() ? d->list.at(index)->item : 0;
}
/*!
\reimp
*/
QLayoutItem *QBoxLayout::takeAt(int index)
{
Q_D(QBoxLayout);
if (index < 0 || index >= d->list.count())
return 0;
QBoxLayoutItem *b = d->list.takeAt(index);
QLayoutItem *item = b->item;
b->item = 0;
delete b;
if (QLayout *l = item->layout()) {
// sanity check in case the user passed something weird to QObject::setParent()
if (l->parent() == this)
l->setParent(0);
}
invalidate();
return item;
}
/*!
\reimp
*/
Qt::Orientations QBoxLayout::expandingDirections() const
{
Q_D(const QBoxLayout);
if (d->dirty)
const_cast<QBoxLayout*>(this)->d_func()->setupGeom();
return d->expanding;
}
/*!
\reimp
*/
void QBoxLayout::setGeometry(const QRect &r)
{
Q_D(QBoxLayout);
if (d->dirty || r != geometry()) {
QRect oldRect = geometry();
QLayout::setGeometry(r);
if (d->dirty)
d->setupGeom();
QRect cr = alignment() ? alignmentRect(r) : r;
int left, top, right, bottom;
d->effectiveMargins(&left, &top, &right, &bottom);
QRect s(cr.x() + left, cr.y() + top,
cr.width() - (left + right),
cr.height() - (top + bottom));
QVector<QLayoutStruct> a = d->geomArray;
int pos = horz(d->dir) ? s.x() : s.y();
int space = horz(d->dir) ? s.width() : s.height();
int n = a.count();
if (d->hasHfw && !horz(d->dir)) {
for (int i = 0; i < n; i++) {
QBoxLayoutItem *box = d->list.at(i);
if (box->item->hasHeightForWidth()) {
int width = qBound(box->item->minimumSize().width(), s.width(), box->item->maximumSize().width());
a[i].sizeHint = a[i].minimumSize =
box->item->heightForWidth(width);
}
}
}
Direction visualDir = d->dir;
QWidget *parent = parentWidget();
if (parent && parent->isRightToLeft()) {
if (d->dir == LeftToRight)
visualDir = RightToLeft;
else if (d->dir == RightToLeft)
visualDir = LeftToRight;
}
qGeomCalc(a, 0, n, pos, space);
bool reverse = (horz(visualDir)
? ((r.right() > oldRect.right()) != (visualDir == RightToLeft))
: r.bottom() > oldRect.bottom());
for (int j = 0; j < n; j++) {
int i = reverse ? n-j-1 : j;
QBoxLayoutItem *box = d->list.at(i);
switch (visualDir) {
case LeftToRight:
box->item->setGeometry(QRect(a.at(i).pos, s.y(), a.at(i).size, s.height()));
break;
case RightToLeft:
box->item->setGeometry(QRect(s.left() + s.right() - a.at(i).pos - a.at(i).size + 1,
s.y(), a.at(i).size, s.height()));
break;
case TopToBottom:
box->item->setGeometry(QRect(s.x(), a.at(i).pos, s.width(), a.at(i).size));
break;
case BottomToTop:
box->item->setGeometry(QRect(s.x(),
s.top() + s.bottom() - a.at(i).pos - a.at(i).size + 1,
s.width(), a.at(i).size));
}
}
}
}
/*!
\reimp
*/
void QBoxLayout::addItem(QLayoutItem *item)
{
Q_D(QBoxLayout);
QBoxLayoutItem *it = new QBoxLayoutItem(item);
d->list.append(it);
invalidate();
}
/*!
Inserts \a item into this box layout at position \a index. If \a
index is negative, the item is added at the end.
\sa addItem(), insertWidget(), insertLayout(), insertStretch(),
insertSpacing()
*/
void QBoxLayout::insertItem(int index, QLayoutItem *item)
{
Q_D(QBoxLayout);
if (index < 0) // append
index = d->list.count();
QBoxLayoutItem *it = new QBoxLayoutItem(item);
d->list.insert(index, it);
invalidate();
}
/*!
Inserts a non-stretchable space (a QSpacerItem) at position \a index, with
size \a size. If \a index is negative the space is added at the end.
The box layout has default margin and spacing. This function adds
additional space.
\sa addSpacing(), insertItem(), QSpacerItem
*/
void QBoxLayout::insertSpacing(int index, int size)
{
Q_D(QBoxLayout);
if (index < 0) // append
index = d->list.count();
QLayoutItem *b;
if (horz(d->dir))
b = QLayoutPrivate::createSpacerItem(this, size, 0, QSizePolicy::Fixed, QSizePolicy::Minimum);
else
b = QLayoutPrivate::createSpacerItem(this, 0, size, QSizePolicy::Minimum, QSizePolicy::Fixed);
QT_TRY {
QBoxLayoutItem *it = new QBoxLayoutItem(b);
it->magic = true;
d->list.insert(index, it);
} QT_CATCH(...) {
delete b;
QT_RETHROW;
}
invalidate();
}
/*!
Inserts a stretchable space (a QSpacerItem) at position \a
index, with zero minimum size and stretch factor \a stretch. If \a
index is negative the space is added at the end.
\sa addStretch(), insertItem(), QSpacerItem
*/
void QBoxLayout::insertStretch(int index, int stretch)
{
Q_D(QBoxLayout);
if (index < 0) // append
index = d->list.count();
QLayoutItem *b;
if (horz(d->dir))
b = QLayoutPrivate::createSpacerItem(this, 0, 0, QSizePolicy::Expanding, QSizePolicy::Minimum);
else
b = QLayoutPrivate::createSpacerItem(this, 0, 0, QSizePolicy::Minimum, QSizePolicy::Expanding);
QBoxLayoutItem *it = new QBoxLayoutItem(b, stretch);
it->magic = true;
d->list.insert(index, it);
invalidate();
}
/*!
\since 4.4
Inserts \a spacerItem at position \a index, with zero minimum
size and stretch factor. If \a index is negative the
space is added at the end.
\sa addSpacerItem(), insertStretch(), insertSpacing()
*/
void QBoxLayout::insertSpacerItem(int index, QSpacerItem *spacerItem)
{
Q_D(QBoxLayout);
if (index < 0) // append
index = d->list.count();
QBoxLayoutItem *it = new QBoxLayoutItem(spacerItem);
it->magic = true;
d->list.insert(index, it);
invalidate();
}
/*!
Inserts \a layout at position \a index, with stretch factor \a
stretch. If \a index is negative, the layout is added at the end.
\a layout becomes a child of the box layout.
\sa addLayout(), insertItem()
*/
void QBoxLayout::insertLayout(int index, QLayout *layout, int stretch)
{
Q_D(QBoxLayout);
if (!adoptLayout(layout))
return;
if (index < 0) // append
index = d->list.count();
QBoxLayoutItem *it = new QBoxLayoutItem(layout, stretch);
d->list.insert(index, it);
invalidate();
}
/*!
Inserts \a widget at position \a index, with stretch factor \a
stretch and alignment \a alignment. If \a index is negative, the
widget is added at the end.
The stretch factor applies only in the \l{direction()}{direction}
of the QBoxLayout, and is relative to the other boxes and widgets
in this QBoxLayout. Widgets and boxes with higher stretch factors
grow more.
If the stretch factor is 0 and nothing else in the QBoxLayout has
a stretch factor greater than zero, the space is distributed
according to the QWidget:sizePolicy() of each widget that's
involved.
The alignment is specified by \a alignment. The default alignment
is 0, which means that the widget fills the entire cell.
\sa addWidget(), insertItem()
*/
void QBoxLayout::insertWidget(int index, QWidget *widget, int stretch,
Qt::Alignment alignment)
{
Q_D(QBoxLayout);
// check if the widget can be added to the layout
if (!widget) {
qWarning("QLayout: Cannot add null widget to %s/%s", metaObject()->className(),
objectName().toLocal8Bit().data());
return;
}
addChildWidget(widget);
if (index < 0) // append
index = d->list.count();
QWidgetItem *b = QLayoutPrivate::createWidgetItem(this, widget);
b->setAlignment(alignment);
QBoxLayoutItem *it;
QT_TRY{
it = new QBoxLayoutItem(b, stretch);
} QT_CATCH(...) {
delete b;
QT_RETHROW;
}
QT_TRY{
d->list.insert(index, it);
} QT_CATCH(...) {
delete it;
QT_RETHROW;
}
invalidate();
}
/*!
Adds a non-stretchable space (a QSpacerItem) with size \a size
to the end of this box layout. QBoxLayout provides default margin
and spacing. This function adds additional space.
\sa insertSpacing(), addItem(), QSpacerItem
*/
void QBoxLayout::addSpacing(int size)
{
insertSpacing(-1, size);
}
/*!
Adds a stretchable space (a QSpacerItem) with zero minimum
size and stretch factor \a stretch to the end of this box layout.
\sa insertStretch(), addItem(), QSpacerItem
*/
void QBoxLayout::addStretch(int stretch)
{
insertStretch(-1, stretch);
}
/*!
\since 4.4
Adds \a spacerItem to the end of this box layout.
\sa addSpacing(), addStretch()
*/
void QBoxLayout::addSpacerItem(QSpacerItem *spacerItem)
{
insertSpacerItem(-1, spacerItem);
}
/*!
Adds \a widget to the end of this box layout, with a stretch
factor of \a stretch and alignment \a alignment.
The stretch factor applies only in the \l{direction()}{direction}
of the QBoxLayout, and is relative to the other boxes and widgets
in this QBoxLayout. Widgets and boxes with higher stretch factors
grow more.
If the stretch factor is 0 and nothing else in the QBoxLayout has
a stretch factor greater than zero, the space is distributed
according to the QWidget:sizePolicy() of each widget that's
involved.
The alignment is specified by \a alignment. The default
alignment is 0, which means that the widget fills the entire cell.
\sa insertWidget(), addItem(), addLayout(), addStretch(),
addSpacing(), addStrut()
*/
void QBoxLayout::addWidget(QWidget *widget, int stretch, Qt::Alignment alignment)
{
insertWidget(-1, widget, stretch, alignment);
}
/*!
Adds \a layout to the end of the box, with serial stretch factor
\a stretch.
\sa insertLayout(), addItem(), addWidget()
*/
void QBoxLayout::addLayout(QLayout *layout, int stretch)
{
insertLayout(-1, layout, stretch);
}
/*!
Limits the perpendicular dimension of the box (e.g. height if the
box is \l LeftToRight) to a minimum of \a size. Other constraints
may increase the limit.
\sa addItem()
*/
void QBoxLayout::addStrut(int size)
{
Q_D(QBoxLayout);
QLayoutItem *b;
if (horz(d->dir))
b = QLayoutPrivate::createSpacerItem(this, 0, size, QSizePolicy::Fixed, QSizePolicy::Minimum);
else
b = QLayoutPrivate::createSpacerItem(this, size, 0, QSizePolicy::Minimum, QSizePolicy::Fixed);
QBoxLayoutItem *it = new QBoxLayoutItem(b);
it->magic = true;
d->list.append(it);
invalidate();
}
/*!
\fn int QBoxLayout::findWidget(QWidget *widget)
Use indexOf(\a widget) instead.
*/
/*!
Sets the stretch factor for \a widget to \a stretch and returns
true if \a widget is found in this layout (not including child
layouts); otherwise returns false.
\sa setAlignment()
*/
bool QBoxLayout::setStretchFactor(QWidget *widget, int stretch)
{
Q_D(QBoxLayout);
if (!widget)
return false;
for (int i = 0; i < d->list.size(); ++i) {
QBoxLayoutItem *box = d->list.at(i);
if (box->item->widget() == widget) {
box->stretch = stretch;
invalidate();
return true;
}
}
return false;
}
/*!
\overload
Sets the stretch factor for the layout \a layout to \a stretch and
returns true if \a layout is found in this layout (not including
child layouts); otherwise returns false.
*/
bool QBoxLayout::setStretchFactor(QLayout *layout, int stretch)
{
Q_D(QBoxLayout);
for (int i = 0; i < d->list.size(); ++i) {
QBoxLayoutItem *box = d->list.at(i);
if (box->item->layout() == layout) {
if (box->stretch != stretch) {
box->stretch = stretch;
invalidate();
}
return true;
}
}
return false;
}
/*!
Sets the stretch factor at position \a index. to \a stretch.
\since 4.5
*/
void QBoxLayout::setStretch(int index, int stretch)
{
Q_D(QBoxLayout);
if (index >= 0 && index < d->list.size()) {
QBoxLayoutItem *box = d->list.at(index);
if (box->stretch != stretch) {
box->stretch = stretch;
invalidate();
}
}
}
/*!
Returns the stretch factor at position \a index.
\since 4.5
*/
int QBoxLayout::stretch(int index) const
{
Q_D(const QBoxLayout);
if (index >= 0 && index < d->list.size())
return d->list.at(index)->stretch;
return -1;
}
/*!
Sets the direction of this layout to \a direction.
*/
void QBoxLayout::setDirection(Direction direction)
{
Q_D(QBoxLayout);
if (d->dir == direction)
return;
if (horz(d->dir) != horz(direction)) {
//swap around the spacers (the "magic" bits)
//#### a bit yucky, knows too much.
//#### probably best to add access functions to spacerItem
//#### or even a QSpacerItem::flip()
for (int i = 0; i < d->list.size(); ++i) {
QBoxLayoutItem *box = d->list.at(i);
if (box->magic) {
QSpacerItem *sp = box->item->spacerItem();
if (sp) {
if (sp->expandingDirections() == Qt::Orientations(0) /*No Direction*/) {
//spacing or strut
QSize s = sp->sizeHint();
sp->changeSize(s.height(), s.width(),
horz(direction) ? QSizePolicy::Fixed:QSizePolicy::Minimum,
horz(direction) ? QSizePolicy::Minimum:QSizePolicy::Fixed);
} else {
//stretch
if (horz(direction))
sp->changeSize(0, 0, QSizePolicy::Expanding,
QSizePolicy::Minimum);
else
sp->changeSize(0, 0, QSizePolicy::Minimum,
QSizePolicy::Expanding);
}
}
}
}
}
d->dir = direction;
invalidate();
}
/*!
\fn QBoxLayout::Direction QBoxLayout::direction() const
Returns the direction of the box. addWidget() and addSpacing()
work in this direction; the stretch stretches in this direction.
\sa QBoxLayout::Direction addWidget() addSpacing()
*/
QBoxLayout::Direction QBoxLayout::direction() const
{
Q_D(const QBoxLayout);
return d->dir;
}
/*!
\class QHBoxLayout
\brief The QHBoxLayout class lines up widgets horizontally.
\ingroup geomanagement
This class is used to construct horizontal box layout objects. See
QBoxLayout for details.
The simplest use of the class is like this:
\snippet doc/src/snippets/layouts/layouts.cpp 0
\snippet doc/src/snippets/layouts/layouts.cpp 1
\snippet doc/src/snippets/layouts/layouts.cpp 2
\codeline
\snippet doc/src/snippets/layouts/layouts.cpp 3
\snippet doc/src/snippets/layouts/layouts.cpp 4
\snippet doc/src/snippets/layouts/layouts.cpp 5
First, we create the widgets we want in the layout. Then, we
create the QHBoxLayout object and add the widgets into the
layout. Finally, we call QWidget::setLayout() to install the
QHBoxLayout object onto the widget. At that point, the widgets in
the layout are reparented to have \c window as their parent.
\image qhboxlayout-with-5-children.png Horizontal box layout with five child widgets
\sa QVBoxLayout, QGridLayout, QStackedLayout, {Layout Management}, {Basic Layouts Example}
*/
/*!
Constructs a new top-level horizontal box with
parent \a parent.
*/
QHBoxLayout::QHBoxLayout(QWidget *parent)
: QBoxLayout(LeftToRight, parent)
{
}
/*!
Constructs a new horizontal box. You must add
it to another layout.
*/
QHBoxLayout::QHBoxLayout()
: QBoxLayout(LeftToRight)
{
}
/*!
Destroys this box layout.
The layout's widgets aren't destroyed.
*/
QHBoxLayout::~QHBoxLayout()
{
}
/*!
\class QVBoxLayout
\brief The QVBoxLayout class lines up widgets vertically.
\ingroup geomanagement
This class is used to construct vertical box layout objects. See
QBoxLayout for details.
The simplest use of the class is like this:
\snippet doc/src/snippets/layouts/layouts.cpp 6
\snippet doc/src/snippets/layouts/layouts.cpp 7
\snippet doc/src/snippets/layouts/layouts.cpp 8
\codeline
\snippet doc/src/snippets/layouts/layouts.cpp 9
\snippet doc/src/snippets/layouts/layouts.cpp 10
\snippet doc/src/snippets/layouts/layouts.cpp 11
First, we create the widgets we want in the layout. Then, we
create the QVBoxLayout object and add the widgets into the
layout. Finally, we call QWidget::setLayout() to install the
QVBoxLayout object onto the widget. At that point, the widgets in
the layout are reparented to have \c window as their parent.
\image qvboxlayout-with-5-children.png Horizontal box layout with five child widgets
\sa QHBoxLayout, QGridLayout, QStackedLayout, {Layout Management}, {Basic Layouts Example}
*/
/*!
Constructs a new top-level vertical box with
parent \a parent.
*/
QVBoxLayout::QVBoxLayout(QWidget *parent)
: QBoxLayout(TopToBottom, parent)
{
}
/*!
Constructs a new vertical box. You must add
it to another layout.
*/
QVBoxLayout::QVBoxLayout()
: QBoxLayout(TopToBottom)
{
}
/*!
Destroys this box layout.
The layout's widgets aren't destroyed.
*/
QVBoxLayout::~QVBoxLayout()
{
}
/*!
\fn QWidget *QLayout::mainWidget() const
Use parentWidget() instead.
*/
/*!
\fn void QLayout::remove(QWidget *widget)
Use removeWidget(\a widget) instead.
*/
/*!
\fn void QLayout::add(QWidget *widget)
Use addWidget(\a widget) instead.
*/
/*!
\fn QLayoutIterator QLayout::iterator()
Use a QLayoutIterator() constructor instead.
*/
/*!
\fn int QLayout::defaultBorder() const
Use spacing() instead.
*/
QT_END_NAMESPACE
#include "moc_qboxlayout.h"
Reference in a new issue View git blame Copy permalink