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liblxqt-packaging/lxqtgridlayout.cpp

608 lines
15 KiB

/* BEGIN_COMMON_COPYRIGHT_HEADER
* (c)LGPL2+
*
* LXQt - a lightweight, Qt based, desktop toolset
* http://razor-qt.org
*
* Copyright: 2012 Razor team
* Authors:
* Alexander Sokoloff <sokoloff.a@gmail.com>
*
* This program or library is free software; you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*
* END_COMMON_COPYRIGHT_HEADER */
#include "lxqtgridlayout.h"
#include <QDebug>
#include <math.h>
#include <QWidget>
using namespace LxQt;
class LxQt::GridLayoutPrivate
{
public:
GridLayoutPrivate();
QList<QLayoutItem*> mItems;
int mRowCount;
int mColumnCount;
GridLayout::Direction mDirection;
bool mIsValid;
QSize mCellSizeHint;
QSize mCellMaxSize;
int mVisibleCount;
GridLayout::Stretch mStretch;
void updateCache();
int rows() const;
int cols() const;
QSize mPrefCellMinSize;
QSize mPrefCellMaxSize;
};
/************************************************
************************************************/
GridLayoutPrivate::GridLayoutPrivate()
{
mColumnCount = 0;
mRowCount = 0;
mDirection = GridLayout::LeftToRight;
mIsValid = false;
mVisibleCount = 0;
mStretch = GridLayout::StretchHorizontal | GridLayout::StretchVertical;
mPrefCellMinSize = QSize(0,0);
mPrefCellMaxSize = QSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
}
/************************************************
************************************************/
void GridLayoutPrivate::updateCache()
{
mCellSizeHint = QSize(0, 0);
mCellMaxSize = QSize(0, 0);
mVisibleCount = 0;
for (int i=0; i<mItems.count(); ++i)
{
QLayoutItem *item = mItems.at(i);
if (!item->widget() || item->widget()->isHidden())
continue;
int h = qBound(item->minimumSize().height(),
item->sizeHint().height(),
item->maximumSize().height());
int w = qBound(item->minimumSize().width(),
item->sizeHint().width(),
item->maximumSize().width());
mCellSizeHint.rheight() = qMax(mCellSizeHint.height(), h);
mCellSizeHint.rwidth() = qMax(mCellSizeHint.width(), w);
mCellMaxSize.rheight() = qMax(mCellMaxSize.height(), item->maximumSize().height());
mCellMaxSize.rwidth() = qMax(mCellMaxSize.width(), item->maximumSize().width());
mVisibleCount++;
#if 0
qDebug() << "-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-";
qDebug() << "item.min" << item->minimumSize().width();
qDebug() << "item.sz " << item->sizeHint().width();
qDebug() << "item.max" << item->maximumSize().width();
qDebug() << "w h" << w << h;
qDebug() << "wid.sizeHint" << item->widget()->sizeHint();
qDebug() << "mCellSizeHint:" << mCellSizeHint;
qDebug() << "mCellMaxSize: " << mCellMaxSize;
qDebug() << "-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-";
#endif
}
mCellSizeHint.rwidth() = qBound(mPrefCellMinSize.width(), mCellSizeHint.width(), mPrefCellMaxSize.width());
mCellSizeHint.rheight()= qBound(mPrefCellMinSize.height(), mCellSizeHint.height(), mPrefCellMaxSize.height());
mIsValid = !mCellSizeHint.isEmpty();
}
/************************************************
************************************************/
int GridLayoutPrivate::rows() const
{
if (mRowCount)
return mRowCount;
if (!mColumnCount)
return 1;
return ceil(mVisibleCount * 1.0 / mColumnCount);
}
/************************************************
************************************************/
int GridLayoutPrivate::cols() const
{
if (mColumnCount)
return mColumnCount;
int rows = mRowCount;
if (!rows)
rows = 1;
return ceil(mVisibleCount * 1.0 / rows);
}
/************************************************
************************************************/
GridLayout::GridLayout(QWidget *parent):
QLayout(parent),
d_ptr(new GridLayoutPrivate())
{
}
/************************************************
************************************************/
GridLayout::~GridLayout()
{
delete d_ptr;
}
/************************************************
************************************************/
void GridLayout::addItem(QLayoutItem *item)
{
d_ptr->mItems.append(item);
}
/************************************************
************************************************/
QLayoutItem *GridLayout::itemAt(int index) const
{
Q_D(const GridLayout);
if (index < 0 || index >= d->mItems.count())
return 0;
return d->mItems.at(index);
}
/************************************************
************************************************/
QLayoutItem *GridLayout::takeAt(int index)
{
Q_D(GridLayout);
if (index < 0 || index >= d->mItems.count())
return 0;
QLayoutItem *item = d->mItems.takeAt(index);
return item;
}
/************************************************
************************************************/
int GridLayout::count() const
{
Q_D(const GridLayout);
return d->mItems.count();
}
/************************************************
************************************************/
void GridLayout::invalidate()
{
Q_D(GridLayout);
d->mIsValid = false;
QLayout::invalidate();
}
/************************************************
************************************************/
int GridLayout::rowCount() const
{
Q_D(const GridLayout);
return d->mRowCount;
}
/************************************************
************************************************/
void GridLayout::setRowCount(int value)
{
Q_D(GridLayout);
if (d->mRowCount != value)
{
d->mRowCount = value;
invalidate();
}
}
/************************************************
************************************************/
int GridLayout::columnCount() const
{
Q_D(const GridLayout);
return d->mColumnCount;
}
/************************************************
************************************************/
void GridLayout::setColumnCount(int value)
{
Q_D(GridLayout);
if (d->mColumnCount != value)
{
d->mColumnCount = value;
invalidate();
}
}
/************************************************
************************************************/
GridLayout::Direction GridLayout::direction() const
{
Q_D(const GridLayout);
return d->mDirection;
}
/************************************************
************************************************/
void GridLayout::setDirection(GridLayout::Direction value)
{
Q_D(GridLayout);
if (d->mDirection != value)
{
d->mDirection = value;
invalidate();
}
}
/************************************************
************************************************/
GridLayout::Stretch GridLayout::stretch() const
{
Q_D(const GridLayout);
return d->mStretch;
}
/************************************************
************************************************/
void GridLayout::setStretch(Stretch value)
{
Q_D(GridLayout);
if (d->mStretch != value)
{
d->mStretch = value;
invalidate();
}
}
/************************************************
************************************************/
void GridLayout::moveItem(int from, int to)
{
Q_D(GridLayout);
d->mItems.move(from, to);
invalidate();
}
/************************************************
************************************************/
QSize GridLayout::cellMinimumSize() const
{
Q_D(const GridLayout);
return d->mPrefCellMinSize;
}
/************************************************
************************************************/
void GridLayout::setCellMinimumSize(QSize minSize)
{
Q_D(GridLayout);
if (d->mPrefCellMinSize != minSize)
{
d->mPrefCellMinSize = minSize;
invalidate();
}
}
/************************************************
************************************************/
void GridLayout::setCellMinimumHeight(int value)
{
Q_D(GridLayout);
if (d->mPrefCellMinSize.height() != value)
{
d->mPrefCellMinSize.setHeight(value);
invalidate();
}
}
/************************************************
************************************************/
void GridLayout::setCellMinimumWidth(int value)
{
Q_D(GridLayout);
if (d->mPrefCellMinSize.width() != value)
{
d->mPrefCellMinSize.setWidth(value);
invalidate();
}
}
/************************************************
************************************************/
QSize GridLayout::cellMaximumSize() const
{
Q_D(const GridLayout);
return d->mPrefCellMaxSize;
}
/************************************************
************************************************/
void GridLayout::setCellMaximumSize(QSize maxSize)
{
Q_D(GridLayout);
if (d->mPrefCellMaxSize != maxSize)
{
d->mPrefCellMaxSize = maxSize;
invalidate();
}
}
/************************************************
************************************************/
void GridLayout::setCellMaximumHeight(int value)
{
Q_D(GridLayout);
if (d->mPrefCellMaxSize.height() != value)
{
d->mPrefCellMaxSize.setHeight(value);
invalidate();
}
}
/************************************************
************************************************/
void GridLayout::setCellMaximumWidth(int value)
{
Q_D(GridLayout);
if (d->mPrefCellMaxSize.width() != value)
{
d->mPrefCellMaxSize.setWidth(value);
invalidate();
}
}
/************************************************
************************************************/
void GridLayout::setCellFixedSize(QSize size)
{
Q_D(GridLayout);
if (d->mPrefCellMinSize != size ||
d->mPrefCellMaxSize != size)
{
d->mPrefCellMinSize = size;
d->mPrefCellMaxSize = size;
invalidate();
}
}
/************************************************
************************************************/
void GridLayout::setCellFixedHeight(int value)
{
Q_D(GridLayout);
if (d->mPrefCellMinSize.height() != value ||
d->mPrefCellMaxSize.height() != value)
{
d->mPrefCellMinSize.setHeight(value);
d->mPrefCellMaxSize.setHeight(value);
invalidate();
}
}
/************************************************
************************************************/
void GridLayout::setCellFixedWidth(int value)
{
Q_D(GridLayout);
if (d->mPrefCellMinSize.width() != value ||
d->mPrefCellMaxSize.width() != value)
{
d->mPrefCellMinSize.setWidth(value);
d->mPrefCellMaxSize.setWidth(value);
invalidate();
}
}
/************************************************
************************************************/
QSize GridLayout::sizeHint() const
{
Q_D(const GridLayout);
if (!d->mIsValid)
const_cast<GridLayoutPrivate*>(d)->updateCache();
return QSize(d->cols() * d->mCellSizeHint.width(),
d->rows() * d->mCellSizeHint.height());
}
/************************************************
************************************************/
void GridLayout::setGeometry(const QRect &geometry)
{
Q_D(GridLayout);
if (!d->mIsValid)
d->updateCache();
int y = geometry.top();
int x = geometry.left();
// For historical reasons QRect::right returns left() + width() - 1
// and QRect::bottom() returns top() + height() - 1;
// So we use left() + height() and top() + height()
//
// http://qt-project.org/doc/qt-4.8/qrect.html
const int maxX = geometry.left() + geometry.width();
const int maxY = geometry.top() + geometry.height();
const bool stretch_h = d->mStretch.testFlag(StretchHorizontal);
const bool stretch_v = d->mStretch.testFlag(StretchVertical);
const int cols = d->cols();
int itemWidth = 0;
if (stretch_h && 0 < cols)
itemWidth = qMin(geometry.width() / cols, d->mCellMaxSize.width());
else
itemWidth = d->mCellSizeHint.width();
itemWidth = qBound(qMin(d->mPrefCellMinSize.width(), maxX), itemWidth, d->mPrefCellMaxSize.width());
const int widthRemain = stretch_h && 0 < itemWidth ? geometry.width() % itemWidth : 0;
const int rows = d->rows();
int itemHeight = 0;
if (stretch_v && 0 < rows)
itemHeight = qMin(geometry.height() / rows, d->mCellMaxSize.height());
else
itemHeight = d->mCellSizeHint.height();
itemHeight = qBound(qMin(d->mPrefCellMinSize.height(), maxY), itemHeight, d->mPrefCellMaxSize.height());
const int heightRemain = stretch_v && 0 < itemHeight ? geometry.height() % itemHeight : 0;
#if 0
qDebug() << "** GridLayout::setGeometry *******************************";
qDebug() << "Geometry:" << geometry;
qDebug() << "CellSize:" << d->mCellSizeHint;
qDebug() << "Constraints:" << "min" << d->mPrefCellMinSize << "max" << d->mPrefCellMaxSize;
qDebug() << "Count" << count();
qDebug() << "Cols:" << d->cols() << "(" << d->mColumnCount << ")";
qDebug() << "Rows:" << d->rows() << "(" << d->mRowCount << ")";
qDebug() << "Stretch:" << "h:" << (d->mStretch.testFlag(StretchHorizontal)) << " v:" << (d->mStretch.testFlag(StretchVertical));
qDebug() << "Item:" << "h:" << itemHeight << " w:" << itemWidth;
#endif
int remain_height = heightRemain;
int remain_width = widthRemain;
if (d->mDirection == LeftToRight)
{
int height = itemHeight + (0 < remain_height-- ? 1 : 0);
foreach(QLayoutItem *item, d->mItems)
{
if (!item->widget() || item->widget()->isHidden())
continue;
int width = itemWidth + (0 < remain_width-- ? 1 : 0);
if (x + width > maxX)
{
x = geometry.left();
y += height;
height = itemHeight + (0 < remain_height-- ? 1 : 0);
remain_width = widthRemain;
}
item->setGeometry(QRect(x, y, width, height));
x += width;
}
}
else
{
int width = itemWidth + (0 < remain_width-- ? 1 : 0);
foreach(QLayoutItem *item, d->mItems)
{
if (!item->widget() || item->widget()->isHidden())
continue;
int height = itemHeight + (0 < remain_height-- ? 1 : 0);
if (y + height > maxY)
{
y = geometry.top();
x += width;
width = itemWidth + (0 < remain_width-- ? 1 : 0);
remain_height = heightRemain;
}
item->setGeometry(QRect(x, y, width, height));
y += height;
}
}
}