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#include "spatialnavigation4dir.h"
#include <QQuickItem>
#include <QDebug>
#include <algorithm>
#include <functional>
//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(ItemRegister *itemRegister)
:CursorNavigationAlgorithm (itemRegister)
{
}
QQuickItem* SpatialNavigation4Dir::getNextCandidate(const QList<QQuickItem*> &candidates,
const QQuickItem *currentItem,
const CursorNavigationCommand &cmd)
{
if (candidates.isEmpty())
return nullptr;
qDebug() << "spatial chooser called, no of candidates=" << candidates.count();
if (!currentItem && candidates.size()) {
qDebug() << "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->mapRectToScene(QRectF( 0, 0,
currentItem->width(), currentItem->height() ));
//NOTICE: overlapping candidates will be ignored for now (TODO, this needs to be changed)
if (cmd.angleIsBetween(315, 45) || cmd.angleIsBetween(135, 225) ) {
//if (cmd == CursorNavigationCommand::Right || cmd == CursorNavigationCommand::Left) {
isInProjection = [¤tItemSceneRect](const QRectF &itemRect) {
return !( currentItemSceneRect.y() > itemRect.y()+itemRect.height() ||
currentItemSceneRect.y()+currentItemSceneRect.height() < itemRect.y() );
};
if (cmd.angleIsBetween(315, 45)) {
//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 (cmd.angleIsBetween(225, 315) || cmd.angleIsBetween(45, 135)) {
//} else if (cmd == Command_Up || cmd == Command_Down) {
isInProjection = [¤tItemSceneRect](const QRectF &itemRect) {
return !( currentItemSceneRect.x() > itemRect.x()+itemRect.width() ||
currentItemSceneRect.x()+currentItemSceneRect.width() < itemRect.x() );
};
if (cmd.angleIsBetween(45, 135)) {
//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;
}
std::pair<QQuickItem*,int> closest(nullptr,0);
//qDebug() << "current: x=" << currentItemSceneRect.x() << " y=" << currentItemSceneRect.y();
for (auto candidate : candidates)
{
if (!candidate->isVisible() || !candidate->isEnabled()) {
//qDebug() << "skipping a invisible/disabled item";
continue;
}
//scene coords of the candidate
QRectF candidateSceneRect = candidate->mapRectToScene(
QRect( 0, 0,
candidate->width(), candidate->height() ));
//qDebug() << "x=" << candidateSceneRect.x() << " y=" << candidateSceneRect.y();
if (isInDirection(candidateSceneRect) && isInProjection(candidateSceneRect))
{
//qDebug() << " is in direction and projection...";
int dist = distanceSquared(currentItemSceneRect,candidateSceneRect);
if (closest.second > dist || !closest.first)
{
closest.second = dist;
closest.first = candidate;
}
}
}
if (closest.first)
{
qDebug() << "chosen one: " << closest.first->mapRectToScene(
QRect( 0, 0,
closest.first->width(), closest.first->height() ));
}
if (!closest.first) {
//qDebug() << Q_FUNC_INFO << " looking for a candidate in the general direction...";
for (auto candidate : candidates)
{
if (!candidate->isVisible() || !candidate->isEnabled()) {
//qDebug() << "skipping a invisible/disabled item";
continue;
}
//scene coords of the candidate
QRectF candidateSceneRect = candidate->mapRectToScene(
QRect( 0, 0,
candidate->width(), candidate->height() ));
if (isInDirection(candidateSceneRect))
{
int dist = distanceSquared(currentItemSceneRect,candidateSceneRect);
if (closest.second > dist || !closest.first)
{
closest.second = dist;
closest.first = candidate;
}
}
}
}
qDebug() << Q_FUNC_INFO << " selected candidate:" << closest.first;
return closest.first;
}
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