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/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the Qt Charts module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:GPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3 or (at your option) any later version
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** approved by the KDE Free Qt Foundation. The licenses are as published by
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** the Free Software Foundation and appearing in the file LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <private/legendlayout_p.h>
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#include <private/chartpresenter_p.h>
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#include <private/qlegend_p.h>
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#include <private/abstractchartlayout_p.h>
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#include <private/qlegendmarker_p.h>
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#include <private/legendmarkeritem_p.h>
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#include <QtCharts/QLegendMarker>
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QT_CHARTS_BEGIN_NAMESPACE
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LegendLayout::LegendLayout(QLegend *legend)
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: m_legend(legend),
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m_offsetX(0),
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m_offsetY(0)
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{
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}
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LegendLayout::~LegendLayout()
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{
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}
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void LegendLayout::setOffset(qreal x, qreal y)
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{
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bool scrollHorizontal = true;
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switch (m_legend->alignment()) {
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case Qt::AlignTop:
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case Qt::AlignBottom:
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scrollHorizontal = true;
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break;
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case Qt::AlignLeft:
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case Qt::AlignRight:
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scrollHorizontal = false;
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break;
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}
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// If detached, the scrolling direction is vertical instead of horizontal and vice versa.
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if (!m_legend->isAttachedToChart())
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scrollHorizontal = !scrollHorizontal;
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QRectF boundingRect = geometry();
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qreal left, top, right, bottom;
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getContentsMargins(&left, &top, &right, &bottom);
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boundingRect.adjust(left, top, -right, -bottom);
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// Limit offset between m_minOffset and m_maxOffset
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if (scrollHorizontal) {
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if (m_width <= boundingRect.width())
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return;
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if (x != m_offsetX) {
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m_offsetX = qBound(m_minOffsetX, x, m_maxOffsetX);
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m_legend->d_ptr->items()->setPos(-m_offsetX, boundingRect.top());
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}
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} else {
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if (m_height <= boundingRect.height())
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return;
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if (y != m_offsetY) {
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m_offsetY = qBound(m_minOffsetY, y, m_maxOffsetY);
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m_legend->d_ptr->items()->setPos(boundingRect.left(), -m_offsetY);
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}
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}
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}
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QPointF LegendLayout::offset() const
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{
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return QPointF(m_offsetX, m_offsetY);
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}
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void LegendLayout::invalidate()
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{
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QGraphicsLayout::invalidate();
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if (m_legend->isAttachedToChart())
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m_legend->d_ptr->m_presenter->layout()->invalidate();
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}
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void LegendLayout::setGeometry(const QRectF &rect)
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{
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m_legend->d_ptr->items()->setVisible(m_legend->isVisible());
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QGraphicsLayout::setGeometry(rect);
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if (m_legend->isAttachedToChart())
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setAttachedGeometry(rect);
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else
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setDettachedGeometry(rect);
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}
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void LegendLayout::setAttachedGeometry(const QRectF &rect)
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{
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if (!rect.isValid())
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return;
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qreal oldOffsetX = m_offsetX;
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qreal oldOffsetY = m_offsetY;
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m_offsetX = 0;
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m_offsetY = 0;
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QSizeF size(0, 0);
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if (m_legend->d_ptr->markers().isEmpty()) {
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return;
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}
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m_width = 0;
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m_height = 0;
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qreal left, top, right, bottom;
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getContentsMargins(&left, &top, &right, &bottom);
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QRectF geometry = rect.adjusted(left, top, -right, -bottom);
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switch(m_legend->alignment()) {
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case Qt::AlignTop:
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case Qt::AlignBottom: {
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// Calculate the space required for items and add them to a sorted list.
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qreal markerItemsWidth = 0;
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qreal itemMargins = 0;
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QList<LegendWidthStruct *> legendWidthList;
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foreach (QLegendMarker *marker, m_legend->d_ptr->markers()) {
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LegendMarkerItem *item = marker->d_ptr->item();
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if (item->isVisible()) {
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QSizeF dummySize;
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qreal itemWidth = item->sizeHint(Qt::PreferredSize, dummySize).width();
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LegendWidthStruct *structItem = new LegendWidthStruct;
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structItem->item = item;
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structItem->width = itemWidth;
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legendWidthList.append(structItem);
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markerItemsWidth += itemWidth;
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itemMargins += marker->d_ptr->item()->m_margin;
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}
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}
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std::sort(legendWidthList.begin(), legendWidthList.end(), widthLongerThan);
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// If the items would occupy more space than is available, start truncating them
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// from the longest one.
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qreal availableGeometry = geometry.width() - right - left * 2 - itemMargins;
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if (markerItemsWidth >= availableGeometry && legendWidthList.count() > 0) {
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bool truncated(false);
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int count = legendWidthList.count();
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for (int i = 1; i < count; i++) {
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int truncateIndex = i - 1;
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while (legendWidthList.at(truncateIndex)->width >= legendWidthList.at(i)->width
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&& !truncated) {
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legendWidthList.at(truncateIndex)->width--;
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markerItemsWidth--;
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if (i > 1) {
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// Truncate the items that are before the truncated one in the list.
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for (int j = truncateIndex - 1; j >= 0; j--) {
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if (legendWidthList.at(truncateIndex)->width
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< legendWidthList.at(j)->width) {
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legendWidthList.at(j)->width--;
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markerItemsWidth--;
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}
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}
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}
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if (markerItemsWidth < availableGeometry)
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truncated = true;
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}
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// Truncate the last item if needed.
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if (i == count - 1) {
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if (legendWidthList.at(count - 1)->width
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> legendWidthList.at(truncateIndex)->width) {
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legendWidthList.at(count - 1)->width--;
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markerItemsWidth--;
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}
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}
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if (truncated)
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break;
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}
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// Items are of same width and all of them need to be truncated
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// or there is just one item that is truncated.
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while (markerItemsWidth >= availableGeometry) {
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for (int i = 0; i < count; i++) {
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legendWidthList.at(i)->width--;
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markerItemsWidth--;
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}
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}
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}
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QPointF point(0,0);
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int markerCount = m_legend->d_ptr->markers().count();
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for (int i = 0; i < markerCount; i++) {
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QLegendMarker *marker;
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if (m_legend->d_ptr->m_reverseMarkers)
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marker = m_legend->d_ptr->markers().at(markerCount - 1 - i);
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else
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marker = m_legend->d_ptr->markers().at(i);
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LegendMarkerItem *item = marker->d_ptr->item();
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if (item->isVisible()) {
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QRectF itemRect = geometry;
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qreal availableWidth = 0;
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for (int i = 0; i < legendWidthList.size(); ++i) {
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if (legendWidthList.at(i)->item == item) {
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availableWidth = legendWidthList.at(i)->width;
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break;
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}
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}
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itemRect.setWidth(availableWidth);
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item->setGeometry(itemRect);
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item->setPos(point.x(),geometry.height()/2 - item->boundingRect().height()/2);
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const QRectF &rect = item->boundingRect();
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size = size.expandedTo(rect.size());
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qreal w = rect.width();
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m_width = m_width + w - item->m_margin;
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point.setX(point.x() + w);
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}
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}
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// Delete structs from the container
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qDeleteAll(legendWidthList);
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// Round to full pixel via QPoint to avoid one pixel clipping on the edge in some cases
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if (m_width < geometry.width()) {
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m_legend->d_ptr->items()->setPos(QPoint(geometry.width() / 2 - m_width / 2,
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geometry.top()));
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} else {
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m_legend->d_ptr->items()->setPos(geometry.topLeft().toPoint());
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}
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m_height = size.height();
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}
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break;
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case Qt::AlignLeft:
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case Qt::AlignRight: {
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QPointF point(0,0);
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int markerCount = m_legend->d_ptr->markers().count();
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for (int i = 0; i < markerCount; i++) {
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QLegendMarker *marker;
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if (m_legend->d_ptr->m_reverseMarkers)
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marker = m_legend->d_ptr->markers().at(markerCount - 1 - i);
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else
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marker = m_legend->d_ptr->markers().at(i);
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LegendMarkerItem *item = marker->d_ptr->item();
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if (item->isVisible()) {
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item->setGeometry(geometry);
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item->setPos(point);
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const QRectF &rect = item->boundingRect();
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qreal h = rect.height();
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size = size.expandedTo(rect.size());
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m_height+=h;
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point.setY(point.y() + h);
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}
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}
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// Round to full pixel via QPoint to avoid one pixel clipping on the edge in some cases
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if (m_height < geometry.height()) {
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m_legend->d_ptr->items()->setPos(QPoint(geometry.left(),
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geometry.height() / 2 - m_height / 2));
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} else {
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m_legend->d_ptr->items()->setPos(geometry.topLeft().toPoint());
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}
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m_width = size.width();
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break;
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}
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}
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m_minOffsetX = -left;
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m_minOffsetY = - top;
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m_maxOffsetX = m_width - geometry.width() - right;
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m_maxOffsetY = m_height - geometry.height() - bottom;
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setOffset(oldOffsetX, oldOffsetY);
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}
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void LegendLayout::setDettachedGeometry(const QRectF &rect)
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{
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if (!rect.isValid())
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return;
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// Detached layout is different.
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// In detached mode legend may have multiple rows and columns, so layout calculations
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// differ a log from attached mode.
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// Also the scrolling logic is bit different.
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qreal oldOffsetX = m_offsetX;
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qreal oldOffsetY = m_offsetY;
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m_offsetX = 0;
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m_offsetY = 0;
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qreal left, top, right, bottom;
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getContentsMargins(&left, &top, &right, &bottom);
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QRectF geometry = rect.adjusted(left, top, -right, -bottom);
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QSizeF size(0, 0);
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QList<QLegendMarker *> markers = m_legend->d_ptr->markers();
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if (markers.isEmpty())
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return;
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switch (m_legend->alignment()) {
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case Qt::AlignTop: {
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QPointF point(0, 0);
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m_width = 0;
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m_height = 0;
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for (int i = 0; i < markers.count(); i++) {
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LegendMarkerItem *item = markers.at(i)->d_ptr->item();
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if (item->isVisible()) {
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item->setGeometry(geometry);
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item->setPos(point.x(),point.y());
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const QRectF &boundingRect = item->boundingRect();
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qreal w = boundingRect.width();
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qreal h = boundingRect.height();
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m_width = qMax(m_width,w);
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m_height = qMax(m_height,h);
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point.setX(point.x() + w);
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if (point.x() + w > geometry.left() + geometry.width() - right) {
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// Next item would go off rect.
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point.setX(0);
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point.setY(point.y() + h);
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if (i+1 < markers.count()) {
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m_height += h;
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}
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}
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}
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}
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m_legend->d_ptr->items()->setPos(geometry.topLeft());
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m_minOffsetX = -left;
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m_minOffsetY = -top;
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m_maxOffsetX = m_width - geometry.width() - right;
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m_maxOffsetY = m_height - geometry.height() - bottom;
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}
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break;
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case Qt::AlignBottom: {
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QPointF point(0, geometry.height());
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m_width = 0;
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m_height = 0;
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for (int i = 0; i < markers.count(); i++) {
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LegendMarkerItem *item = markers.at(i)->d_ptr->item();
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if (item->isVisible()) {
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item->setGeometry(geometry);
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const QRectF &boundingRect = item->boundingRect();
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qreal w = boundingRect.width();
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qreal h = boundingRect.height();
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m_width = qMax(m_width,w);
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m_height = qMax(m_height,h);
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item->setPos(point.x(),point.y() - h);
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point.setX(point.x() + w);
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if (point.x() + w > geometry.left() + geometry.width() - right) {
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// Next item would go off rect.
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point.setX(0);
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point.setY(point.y() - h);
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if (i+1 < markers.count()) {
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m_height += h;
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}
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}
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}
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}
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m_legend->d_ptr->items()->setPos(geometry.topLeft());
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m_minOffsetX = -left;
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m_minOffsetY = -m_height + geometry.height() - top;
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m_maxOffsetX = m_width - geometry.width() - right;
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m_maxOffsetY = -bottom;
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}
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break;
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case Qt::AlignLeft: {
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QPointF point(0, 0);
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m_width = 0;
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m_height = 0;
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qreal maxWidth = 0;
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for (int i = 0; i < markers.count(); i++) {
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LegendMarkerItem *item = markers.at(i)->d_ptr->item();
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if (item->isVisible()) {
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item->setGeometry(geometry);
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const QRectF &boundingRect = item->boundingRect();
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qreal w = boundingRect.width();
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qreal h = boundingRect.height();
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m_height = qMax(m_height,h);
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maxWidth = qMax(maxWidth,w);
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item->setPos(point.x(),point.y());
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point.setY(point.y() + h);
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if (point.y() + h > geometry.bottom() - bottom) {
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// Next item would go off rect.
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point.setX(point.x() + maxWidth);
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point.setY(0);
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if (i+1 < markers.count()) {
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m_width += maxWidth;
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maxWidth = 0;
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}
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}
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}
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}
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m_width += maxWidth;
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m_legend->d_ptr->items()->setPos(geometry.topLeft());
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m_minOffsetX = -left;
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m_minOffsetY = -top;
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m_maxOffsetX = m_width - geometry.width() - right;
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m_maxOffsetY = m_height - geometry.height() - bottom;
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}
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break;
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case Qt::AlignRight: {
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|
QPointF point(geometry.width(), 0);
|
|
|
m_width = 0;
|
|
|
m_height = 0;
|
|
|
qreal maxWidth = 0;
|
|
|
for (int i = 0; i < markers.count(); i++) {
|
|
|
LegendMarkerItem *item = markers.at(i)->d_ptr->item();
|
|
|
if (item->isVisible()) {
|
|
|
item->setGeometry(geometry);
|
|
|
const QRectF &boundingRect = item->boundingRect();
|
|
|
qreal w = boundingRect.width();
|
|
|
qreal h = boundingRect.height();
|
|
|
m_height = qMax(m_height,h);
|
|
|
maxWidth = qMax(maxWidth,w);
|
|
|
item->setPos(point.x() - w,point.y());
|
|
|
point.setY(point.y() + h);
|
|
|
if (point.y() + h > geometry.bottom()-bottom) {
|
|
|
// Next item would go off rect.
|
|
|
point.setX(point.x() - maxWidth);
|
|
|
point.setY(0);
|
|
|
if (i+1 < markers.count()) {
|
|
|
m_width += maxWidth;
|
|
|
maxWidth = 0;
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
m_width += maxWidth;
|
|
|
m_legend->d_ptr->items()->setPos(geometry.topLeft());
|
|
|
|
|
|
m_minOffsetX = - m_width + geometry.width() - left;
|
|
|
m_minOffsetY = -top;
|
|
|
m_maxOffsetX = - right;
|
|
|
m_maxOffsetY = m_height - geometry.height() - bottom;
|
|
|
}
|
|
|
break;
|
|
|
default:
|
|
|
break;
|
|
|
}
|
|
|
|
|
|
setOffset(oldOffsetX, oldOffsetY);
|
|
|
}
|
|
|
|
|
|
QSizeF LegendLayout::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
|
|
|
{
|
|
|
QSizeF size(0, 0);
|
|
|
qreal left, top, right, bottom;
|
|
|
getContentsMargins(&left, &top, &right, &bottom);
|
|
|
|
|
|
if(constraint.isValid()) {
|
|
|
foreach(QLegendMarker *marker, m_legend->d_ptr->markers()) {
|
|
|
LegendMarkerItem *item = marker->d_ptr->item();
|
|
|
size = size.expandedTo(item->effectiveSizeHint(which));
|
|
|
}
|
|
|
size = size.boundedTo(constraint);
|
|
|
}
|
|
|
else if (constraint.width() >= 0) {
|
|
|
qreal width = 0;
|
|
|
qreal height = 0;
|
|
|
foreach(QLegendMarker *marker, m_legend->d_ptr->markers()) {
|
|
|
LegendMarkerItem *item = marker->d_ptr->item();
|
|
|
width+=item->effectiveSizeHint(which).width();
|
|
|
height=qMax(height,item->effectiveSizeHint(which).height());
|
|
|
}
|
|
|
|
|
|
size = QSizeF(qMin(constraint.width(),width), height);
|
|
|
}
|
|
|
else if (constraint.height() >= 0) {
|
|
|
qreal width = 0;
|
|
|
qreal height = 0;
|
|
|
foreach(QLegendMarker *marker, m_legend->d_ptr->markers()) {
|
|
|
LegendMarkerItem *item = marker->d_ptr->item();
|
|
|
width=qMax(width,item->effectiveSizeHint(which).width());
|
|
|
height+=height,item->effectiveSizeHint(which).height();
|
|
|
}
|
|
|
size = QSizeF(width,qMin(constraint.height(),height));
|
|
|
}
|
|
|
else {
|
|
|
foreach(QLegendMarker *marker, m_legend->d_ptr->markers()) {
|
|
|
LegendMarkerItem *item = marker->d_ptr->item();
|
|
|
size = size.expandedTo(item->effectiveSizeHint(which));
|
|
|
}
|
|
|
}
|
|
|
size += QSize(left + right, top + bottom);
|
|
|
return size;
|
|
|
}
|
|
|
|
|
|
bool LegendLayout::widthLongerThan(const LegendWidthStruct *item1,
|
|
|
const LegendWidthStruct *item2)
|
|
|
{
|
|
|
return item1->width > item2->width;
|
|
|
}
|
|
|
|
|
|
QT_CHARTS_END_NAMESPACE
|
|
|
|
