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/****************************************************************************
**
** Copyright (C) 2018, 2019 Luxoft Sweden AB. All rights reserved.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the cursor management module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "spatialnavigation4dir.h"
#include "cursornavigationattached.h"
#include <QQuickItem>
#include <QDebug>
#include <algorithm>
#include <functional>
#include <QtMath>
//we only compare distances to eachother so no need to calculate expensive
//square roots. centerpoint comparison is just enough for now too
float distanceSquared(const QRectF& item1, const QRectF& item2)
{
QPointF p1=item1.center();
QPointF p2=item2.center();
float dx=p1.x()-p2.x();
float dy=p1.y()-p2.y();
return dx*dx+dy*dy;
}
SpatialNavigation4Dir::SpatialNavigation4Dir()
{
}
CursorNavigationAttached* SpatialNavigation4Dir::getNextCandidate(
const QList<CursorNavigationAttached*> &candidates,
const CursorNavigationAttached *currentItem,
const CursorNavigationCommand &cmd)
{
if (candidates.isEmpty())
return nullptr;
qCDebug(cursorNavigationLog) << "4-way algortihm called, no of candidates=" << candidates.count();
if (!currentItem && candidates.size()) {
qCDebug(cursorNavigationLog) << "the spatial chooser falling back to first child" << candidates.first();
return candidates.first();
}
//picking the next item according to the current items location and the command:
//-check direction
//-choose candidates in that general direction currentItem our current item (up, down, left or right)
//-currentItem those pick ones inside of current items projection
// -currentItem those within the projection pick the closest one
//-if no hits within the projection, then take the closest with distance just in the general direction
//this algorithm uses the scene coordinates of the items
std::function<bool(const QRectF&)> isInDirection;
std::function<bool(const QRectF&)> isInProjection;
//scene coords of the current item
const QRectF currentItemSceneRect = currentItem->item()->mapRectToScene(QRectF( 0, 0,
currentItem->item()->width(), currentItem->item()->height() ));
//NOTICE: candidates overlapping with current item will be ignored for now (TODO, this needs to be changed)
qreal right_start = -M_PI_4;
qreal right_end = M_PI_4;
qreal left_start = M_PI-M_PI_4;
qreal left_end = -M_PI+M_PI_4;
if (CursorNavigationCommand::angleIsBetween(cmd.angle, right_start, right_end) ||
CursorNavigationCommand::angleIsBetween(cmd.angle, left_start, left_end) ) {
isInProjection = [¤tItemSceneRect](const QRectF &itemRect) {
return !( currentItemSceneRect.y() > itemRect.y()+itemRect.height() ||
currentItemSceneRect.y()+currentItemSceneRect.height() < itemRect.y() );
};
if (CursorNavigationCommand::angleIsBetween(cmd.angle, right_start, right_end)) {
//if (cmd == Command_Right) {
isInDirection = [¤tItemSceneRect](const QRectF &itemRect) {
return currentItemSceneRect.x()+currentItemSceneRect.width() <= itemRect.x();
};
} else {
isInDirection = [¤tItemSceneRect](const QRectF &itemRect) {
return currentItemSceneRect.x() >= itemRect.x()+itemRect.width();
};
}
} else if (CursorNavigationCommand::angleIsBetween(cmd.angle, left_end, right_start) ||
CursorNavigationCommand::angleIsBetween(cmd.angle, right_end, left_start)) {
isInProjection = [¤tItemSceneRect](const QRectF &itemRect) {
return !( currentItemSceneRect.x() > itemRect.x()+itemRect.width() ||
currentItemSceneRect.x()+currentItemSceneRect.width() < itemRect.x() );
};
if (CursorNavigationCommand::angleIsBetween(cmd.angle, right_end, left_start)) {
//if (cmd == Command_Down) {
isInDirection = [¤tItemSceneRect](const QRectF &itemRect) {
return currentItemSceneRect.y()+currentItemSceneRect.height() <= itemRect.y();
};
} else {
isInDirection = [currentItemSceneRect](const QRectF &itemRect) {
return currentItemSceneRect.y() >= itemRect.y()+itemRect.height();
};
}
} else {
return nullptr;
}
//item that is closest within the projection
CursorNavigationAttached* inProjectionItem = nullptr;
float inProjectionItemDistance = -1;
//item that is closest in the general direction, but not within projection
CursorNavigationAttached* inDirectionItem = nullptr;
float inDirectionItemDistance = -1;
for (auto candidate : candidates)
{
QQuickItem *candidateItem = candidate->item();
if (!candidate->available() || candidate == currentItem)
continue;
//scene coords of the candidate
QRectF candidateSceneRect = candidateItem->mapRectToScene(
QRectF( 0, 0,
candidateItem->width(), candidateItem->height() ));
if (isInDirection(candidateSceneRect)) {
if (isInProjection(candidateSceneRect)) {
float dist = distanceSquared(currentItemSceneRect,candidateSceneRect);
if (inProjectionItemDistance > dist || !inProjectionItem)
{
inProjectionItemDistance = dist;
inProjectionItem = candidate;
}
} else if (!inProjectionItem) {
float dist = distanceSquared(currentItemSceneRect,candidateSceneRect);
if (inDirectionItemDistance > dist || !inDirectionItem)
{
inDirectionItemDistance = dist;
inDirectionItem = candidate;
}
}
}
}
if (inProjectionItem)
{
return inProjectionItem;
}
return inDirectionItem;
}
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