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/****************************************************************************
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**
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** Copyright (C) 2012 Digia Plc
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** All rights reserved.
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** For any questions to Digia, please use contact form at http://qt.digia.com
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**
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** This file is part of the Qt Commercial Charts Add-on.
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**
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** $QT_BEGIN_LICENSE$
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt 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 Digia.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.digia.com
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "legendlayout_p.h"
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#include "chartpresenter_p.h"
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#include "legendmarker_p.h"
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#include "qlegend_p.h"
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#include <QDebug>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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LegendLayout::LegendLayout(QLegend* legend)
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: m_legend(legend)
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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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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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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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QPointF point(0, 0);
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foreach (LegendMarker *marker, m_legend->d_ptr->markers()) {
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if (marker->isVisible()) {
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marker->setGeometry(geometry);
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marker->setPos(point.x(), geometry.height() / 2 - marker->boundingRect().height() / 2);
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const QRectF& rect = marker->boundingRect();
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size = size.expandedTo(rect.size());
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qreal w = rect.width();
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m_width += w;
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point.setX(point.x() + w);
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}
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}
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if (m_width < geometry.width())
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m_legend->d_ptr->items()->setPos(geometry.width() / 2 - m_width / 2, geometry.top());
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else
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m_legend->d_ptr->items()->setPos(geometry.topLeft());
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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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foreach (LegendMarker *marker, m_legend->d_ptr->markers()) {
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if (marker->isVisible()) {
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marker->setGeometry(geometry);
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marker->setPos(point);
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const QRectF& rect = marker->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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if (m_height < geometry.height())
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m_legend->d_ptr->items()->setPos(geometry.left(), geometry.height() / 2 - m_height / 2);
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else
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m_legend->d_ptr->items()->setPos(geometry.topLeft());
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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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}
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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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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<LegendMarker *> 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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LegendMarker *marker = markers.at(i);
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if (marker->isVisible()) {
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marker->setGeometry(geometry);
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marker->setPos(point.x(), point.y());
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const QRectF& boundingRect = marker->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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LegendMarker *marker = markers.at(i);
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if (marker->isVisible()) {
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marker->setGeometry(geometry);
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const QRectF& boundingRect = marker->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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marker->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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LegendMarker *marker = markers.at(i);
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if (marker->isVisible()) {
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marker->setGeometry(geometry);
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const QRectF& boundingRect = marker->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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marker->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);
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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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LegendMarker *marker = markers.at(i);
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if (marker->isVisible()) {
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marker->setGeometry(geometry);
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const QRectF& boundingRect = marker->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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marker->setPos(point.x() - w, 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 = - m_width + geometry.width() - left;
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m_minOffsetY = -top;
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m_maxOffsetX = - 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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default:
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break;
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}
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}
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QSizeF LegendLayout::sizeHint(Qt::SizeHint which, const QSizeF & constraint) const
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{
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QSizeF size(0, 0);
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qreal left, top, right, bottom;
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getContentsMargins(&left, &top, &right, &bottom);
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if (constraint.isValid()) {
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foreach (LegendMarker *marker, m_legend->d_ptr->markers())
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size = size.expandedTo(marker->effectiveSizeHint(which));
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size = size.boundedTo(constraint);
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} else if (constraint.width() >= 0) {
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qreal width = 0;
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qreal height = 0;
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foreach (LegendMarker *marker, m_legend->d_ptr->markers()) {
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width += marker->effectiveSizeHint(which).width();
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height = qMax(height, marker->effectiveSizeHint(which).height());
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}
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size = QSizeF(qMin(constraint.width(), width), height);
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} else if (constraint.height() >= 0) {
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qreal width = 0;
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qreal height = 0;
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foreach (LegendMarker *marker, m_legend->d_ptr->markers()) {
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width = qMax(width, marker->effectiveSizeHint(which).width());
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height += height, marker->effectiveSizeHint(which).height();
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}
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size = QSizeF(width, qMin(constraint.height(), height));
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} else {
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foreach (LegendMarker *marker, m_legend->d_ptr->markers())
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size = size.expandedTo(marker->effectiveSizeHint(which));
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}
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size += QSize(left + right, top + bottom);
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return size;
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}
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QTCOMMERCIALCHART_END_NAMESPACE
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