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/***************************************************************************
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* Copyright (C) 2010 - 2011 by Ingomar Wesp <ingomar@wesp.name> *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
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***************************************************************************/
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#include "icongridlayout.h"
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#include <QtCore/QList>
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#include <QtCore/QSizeF>
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#include <QtCore/QRectF>
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#include <QtGui/QGraphicsLayout>
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#include <QtGui/QGraphicsLayoutItem>
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#include <QtGui/QSizePolicy>
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#include <KIconLoader>
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namespace Quicklaunch {
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const int IconGridLayout::DEFAULT_CELL_SPACING = 4;
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IconGridLayout::IconGridLayout(QGraphicsLayoutItem *parent)
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: QGraphicsLayout(parent),
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m_cellSpacing(DEFAULT_CELL_SPACING),
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m_maxSectionCountForced(false),
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setContentsMargins(0, 0, 0, 0);
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QSizePolicy sizePolicy(
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QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);
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sizePolicy.setHeightForWidth(true);
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sizePolicy.setHorizontalStretch(1);
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sizePolicy.setVerticalStretch(1);
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setSizePolicy(sizePolicy);
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IconGridLayout::~IconGridLayout()
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Q_FOREACH(QGraphicsLayoutItem *item, m_items) {
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if (item->ownedByLayout()) {
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IconGridLayout::Mode IconGridLayout::mode() const
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void IconGridLayout::setMode(Mode mode)
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updateGridParameters();
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int IconGridLayout::cellSpacing() const
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void IconGridLayout::setCellSpacing(int cellSpacing)
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cellSpacing = qMax(0, cellSpacing);
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if (cellSpacing == m_cellSpacing) {
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m_cellSpacing = cellSpacing;
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updateGridParameters();
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int IconGridLayout::maxSectionCount() const
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return m_maxSectionCount;
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void IconGridLayout::setMaxSectionCount(int maxSectionCount)
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if (m_maxSectionCount == maxSectionCount) {
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m_maxSectionCount = maxSectionCount;
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updateGridParameters();
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bool IconGridLayout::maxSectionCountForced() const
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return m_maxSectionCountForced;
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void IconGridLayout::setMaxSectionCountForced(bool enable)
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if (m_maxSectionCountForced == enable) {
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m_maxSectionCountForced = enable;
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updateGridParameters();
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void IconGridLayout::addItem(QGraphicsLayoutItem *item)
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m_items.append(item);
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addChildLayoutItem(item);
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item->setParentLayoutItem(this);
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updateGridParameters();
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void IconGridLayout::insertItem(int index, QGraphicsLayoutItem *item)
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m_items.insert(index, item);
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addChildLayoutItem(item);
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item->setParentLayoutItem(this);
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updateGridParameters();
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void IconGridLayout::moveItem(int from, int to)
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m_items.move(from, to);
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int IconGridLayout::rowCount() const
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int IconGridLayout::columnCount() const
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return m_columnCount;
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int IconGridLayout::count() const
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return m_items.size();
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QGraphicsLayoutItem *IconGridLayout::itemAt(int index) const
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return m_items[index];
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QGraphicsLayoutItem *IconGridLayout::itemAt(int row, int column) const
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return m_items[row * m_columnCount + column];
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void IconGridLayout::removeAt(int index)
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QGraphicsLayoutItem *item = m_items.takeAt(index);
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item->setParentLayoutItem(0);
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if (item->ownedByLayout()) {
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updateGridParameters();
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void IconGridLayout::setGeometry(const QRectF &rect)
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QGraphicsLayout::setGeometry(rect);
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updateGridParameters();
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contentsRect().left(),
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(contentsRect().width() - preferredWidth()) / 2);
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contentsRect().top(),
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(contentsRect().height() - preferredHeight()) / 2);
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QPointF pos(offsetLeft, offsetTop);
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int itemCount = m_items.size();
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for (int i = 0; i < itemCount; i++) {
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int row = i / m_columnCount;
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int column = i % m_columnCount;
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size.setHeight(m_rowHeights.at(row));
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pos.rx() = offsetLeft;
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pos.ry() += m_rowHeights.at(row-1) + m_cellSpacing;
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pos.rx() += m_columnWidths.at(column-1) + m_cellSpacing;
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size.setWidth(m_columnWidths.at(column));
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m_items[i]->setGeometry(QRectF(pos, size));
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QSizeF IconGridLayout::sizeHint(
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Qt::SizeHint which, const QSizeF &constraint) const
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Q_UNUSED(constraint);
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case Qt::PreferredSize: return m_preferredSizeHint;
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case Qt::MinimumSize:
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if (m_mode == PreferRows) {
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return QSizeF(m_preferredSizeHint.width(), KIconLoader::SizeSmall);
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return QSizeF(KIconLoader::SizeSmall, m_preferredSizeHint.height());
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void IconGridLayout::computeGridParameters(
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QList<int> &rowHeights, QList<int> &columnWidths,
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QSizeF &preferredSize) const
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columnWidths.clear();
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const int itemCount = m_items.size();
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if (itemCount == 0) {
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preferredSize.setWidth(.0);
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preferredSize.setHeight(.0);
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if (m_mode == PreferRows) {
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const int height = int(contentsRect().height());
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int minRowHeight = 0;
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Q_FOREACH(QGraphicsLayoutItem *item, m_items) {
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minRowHeight = qMax(minRowHeight, (int)item->minimumHeight());
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if (m_maxSectionCount > 0 && m_maxSectionCountForced) {
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rowCount = qMin(itemCount, m_maxSectionCount);
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rowCount = height / (minRowHeight + m_cellSpacing);
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rowCount = qBound(1, rowCount, itemCount);
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if (m_maxSectionCount > 0) {
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rowCount = qMin(rowCount, m_maxSectionCount);
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columnCount = ceil(double(itemCount) / rowCount);
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// Determine row heights.
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(height - (rowCount - 1) * m_cellSpacing) / rowCount);
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for (int row = 0; row < rowCount; row++) {
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int desiredRowHeight = 0;
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for (int column = 0; column < columnCount; column++) {
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int itemIndex = row * columnCount + column;
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if (itemIndex >= itemCount) {
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qMax(desiredRowHeight, int(m_items.at(itemIndex)->preferredHeight()));
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rowHeights.append(desiredRowHeight < maxRowHeight ? desiredRowHeight : maxRowHeight);
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// Determine column widths.
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for (int column = 0; column < columnCount; column++) {
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for (int row = 0; row < rowCount; row++) {
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int itemIndex = row * columnCount + column;
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if (itemIndex >= itemCount) {
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int preferredItemWidth =
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int(m_items.at(itemIndex)->effectiveSizeHint(Qt::PreferredSize, QSizeF(-1, rowHeights.at(row))).width());
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columnWidth = qMax(columnWidth, preferredItemWidth);
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columnWidths.append(columnWidth);
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} else { // m_mode == PreferColumns
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const int width = int(contentsRect().width());
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int minColumnWidth = 0;
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Q_FOREACH(QGraphicsLayoutItem *item, m_items) {
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minColumnWidth = qMax(minColumnWidth, (int)item->minimumWidth());
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if (m_maxSectionCount > 0 && m_maxSectionCountForced) {
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columnCount = qMin(itemCount, m_maxSectionCount);
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columnCount = width / (minColumnWidth + m_cellSpacing);
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columnCount = qBound(1, columnCount, itemCount);
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if (m_maxSectionCount > 0) {
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columnCount = qMin(columnCount, m_maxSectionCount);
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rowCount = ceil(double(itemCount) / columnCount);
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// Determine column widths.
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(width - (columnCount - 1) * m_cellSpacing) / columnCount);
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for (int column = 0; column < columnCount; column++) {
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int desiredColumnWidth = 0;
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for (int row = 0; row < rowCount; row++) {
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int itemIndex = row * columnCount + column;
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if (itemIndex >= itemCount) {
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qMax(desiredColumnWidth, int(m_items.at(itemIndex)->preferredWidth()));
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columnWidths.append(desiredColumnWidth < maxColumnWidth ? desiredColumnWidth : maxColumnWidth);
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// Determine row heights.
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for (int row = 0; row < rowCount; row++) {
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for (int column = 0; column < columnCount; column++) {
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int itemIndex = row * columnCount + column;
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if (itemIndex >= itemCount) {
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int preferredItemHeight =
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int(m_items.at(itemIndex)->effectiveSizeHint(Qt::PreferredSize, QSizeF(columnWidths.at(column), -1)).height());
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rowHeight = qMax(rowHeight, preferredItemHeight);
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rowHeights.append(rowHeight);
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Q_ASSERT(rowCount > 0 && columnCount > 0);
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Q_ASSERT(rowHeights.length() == rowCount && columnWidths.length() == columnCount);
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preferredSize.setWidth((columnCount - 1) * m_cellSpacing);
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preferredSize.setHeight((rowCount - 1) * m_cellSpacing);
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for (int i = 0; i < columnCount; i++) {
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preferredSize.rwidth() += columnWidths.at(i);
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for (int i = 0; i < rowCount; i++) {
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preferredSize.rheight() += rowHeights.at(i);
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void IconGridLayout::updateGridParameters()
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QSizeF newPreferredSize;
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computeGridParameters(
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m_rowHeights, m_columnWidths,
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m_rowCount = m_rowHeights.size();
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m_columnCount = m_columnWidths.size();
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if (newPreferredSize != m_preferredSizeHint) {
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m_preferredSizeHint = newPreferredSize;