add ListViewFocusController
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Cyril Anisimov
parent
75f189e256
commit
f3df9eb5f5
4 changed files with 478 additions and 311 deletions
385
client/ui/controllers/listViewFocusController.cpp
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385
client/ui/controllers/listViewFocusController.cpp
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#include "listViewFocusController.h"
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#include <QQuickItem>
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#include <QQueue>
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#include <QPointF>
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#include <QRectF>
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#include <QQuickWindow>
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bool isVisible(QObject* item)
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{
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const auto res = item->property("visible").toBool();
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// qDebug() << "==>> " << (res ? "VISIBLE" : "NOT visible") << item;
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return res;
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}
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bool isFocusable(QObject* item)
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{
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const auto res = item->property("isFocusable").toBool();
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return res;
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}
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QPointF getItemCenterPointOnScene(QQuickItem* item)
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{
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const auto x0 = item->x() + (item->width() / 2);
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const auto y0 = item->y() + (item->height() / 2);
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return item->parentItem()->mapToScene(QPointF{x0, y0});
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}
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bool isLess(QObject* item1, QObject* item2)
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{
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const auto p1 = getItemCenterPointOnScene(qobject_cast<QQuickItem*>(item1));
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const auto p2 = getItemCenterPointOnScene(qobject_cast<QQuickItem*>(item2));
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return (p1.y() == p2.y()) ? (p1.x() < p2.x()) : (p1.y() < p2.y());
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}
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bool isMore(QObject* item1, QObject* item2)
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{
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return !isLess(item1, item2);
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}
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bool isListView(QObject* item)
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{
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return item->inherits("QQuickListView");
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}
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bool isOnTheScene(QObject* object)
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{
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QQuickItem* item = qobject_cast<QQuickItem*>(object);
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if (!item) {
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qWarning() << "Couldn't recognize object as item";
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return false;
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}
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if (!item->isVisible()) {
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// qDebug() << "===>> The item is not visible: " << item;
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return false;
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}
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QRectF itemRect = item->mapRectToScene(item->childrenRect());
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QQuickWindow* window = item->window();
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if (!window) {
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qWarning() << "Couldn't get the window on the Scene check";
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return false;
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}
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const auto contentItem = window->contentItem();
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if (!contentItem) {
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qWarning() << "Couldn't get the content item on the Scene check";
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return false;
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}
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QRectF windowRect = contentItem->childrenRect();
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const auto res = (windowRect.contains(itemRect) || isListView(item));
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// qDebug() << (res ? "===>> item is inside the Scene" : "===>> ITEM IS OUTSIDE THE SCENE") << " itemRect: " << itemRect << "; windowRect: " << windowRect;
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return res;
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}
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bool isEnabled(QObject* obj)
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{
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const auto item = qobject_cast<QQuickItem*>(obj);
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return item && item->isEnabled();
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}
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QList<QObject*> getSubChain(QObject* object)
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{
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QList<QObject*> res;
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if (!object) {
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qDebug() << "The object is NULL";
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return res;
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}
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const auto children = object->children();
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for(const auto child : children) {
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if (child
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&& isFocusable(child)
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&& isOnTheScene(child)
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&& isEnabled(child)
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) {
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res.append(child);
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} else {
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res.append(getSubChain(child));
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}
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}
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return res;
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}
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void printItems(const QList<QObject*>& items, QObject* current_item)
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{
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for(const auto& item : items) {
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QQuickItem* i = qobject_cast<QQuickItem*>(item);
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QPointF coords {getItemCenterPointOnScene(i)};
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QString prefix = current_item == i ? "==>" : " ";
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qDebug() << prefix << " Item: " << i << " with coords: " << coords;
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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ListViewFocusController::ListViewFocusController(QQuickItem* listView, QObject* parent)
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: QObject{parent}
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, m_listView{listView}
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, m_focusChain{}
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, m_currentSection{Section::Default}
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, m_header{nullptr}
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, m_footer{nullptr}
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, m_focusedItem{nullptr}
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, m_focusedItemIndex{-1}
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, m_delegateIndex{0}
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, m_isReturnNeeded{false}
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, m_currentSectionString {"Default", "Header", "Delegate", "Footer"}
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{
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QVariant headerItemProperty = m_listView->property("headerItem");
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m_header = headerItemProperty.canConvert<QQuickItem*>() ? headerItemProperty.value<QQuickItem*>() : nullptr;
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QVariant footerItemProperty = m_listView->property("footerItem");
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m_footer = footerItemProperty.canConvert<QQuickItem*>() ? footerItemProperty.value<QQuickItem*>() : nullptr;
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}
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ListViewFocusController::~ListViewFocusController()
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{
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}
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void ListViewFocusController::viewAtCurrentIndex()
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{
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switch(m_currentSection) {
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case Section::Default:
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case Section::Header: {
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QMetaObject::invokeMethod(m_listView, "positionViewAtBeginning");
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break;
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}
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case Section::Delegate: {
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QMetaObject::invokeMethod(m_listView, "positionViewAtIndex",
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Q_ARG(int, m_delegateIndex), // Index
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Q_ARG(int, 2)); // PositionMode (0 = Visible)
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break;
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}
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case Section::Footer: {
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QMetaObject::invokeMethod(m_listView, "positionViewAtEnd");
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break;
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}
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}
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}
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int ListViewFocusController::size() const
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{
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return m_listView->property("count").toInt();
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}
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int ListViewFocusController::currentIndex() const
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{
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return m_delegateIndex;
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}
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void ListViewFocusController::nextElement()
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{
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qDebug() << "===>> Current section: " << m_currentSectionString.at(static_cast<qsizetype>(m_currentSection));
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switch(m_currentSection) {
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case Section::Default: {
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if(m_header) {
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m_currentSection = Section::Header;
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break;
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}
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}
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case Section::Header: {
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if (size() > 0) {
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m_currentSection = Section::Delegate;
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break;
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}
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}
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case Section::Delegate:
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if (m_delegateIndex < (size() - 1)) {
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m_delegateIndex++;
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break;
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} else if (m_footer) {
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m_currentSection = Section::Footer;
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break;
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}
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case Section::Footer: {
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m_isReturnNeeded = true;
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m_currentSection = Section::Default;
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break;
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}
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default: {
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qCritical() << "Current section is invalid!";
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break;
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}
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}
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}
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void ListViewFocusController::previousElement()
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{
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switch(m_currentSection) {
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case Section::Default: {
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if(m_footer) {
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m_currentSection = Section::Footer;
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break;
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}
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}
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case Section::Footer: {
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if (size() > 0) {
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m_currentSection = Section::Delegate;
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m_focusedItemIndex = size() - 1; // workarount to default value == -1
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break;
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}
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}
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case Section::Delegate: {
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if (m_delegateIndex > 0) {
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m_delegateIndex--;
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break;
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} else if (m_header) {
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m_currentSection = Section::Header;
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break;
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}
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}
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case Section::Header: {
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m_isReturnNeeded = true;
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m_currentSection = Section::Default;
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break;
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}
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default: {
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qCritical() << "Current section is invalid!";
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break;
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}
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}
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}
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void ListViewFocusController::decrementIndex()
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{
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m_delegateIndex--;
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}
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QQuickItem* ListViewFocusController::itemAtIndex(const int index)
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{
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QQuickItem* item{nullptr};
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QMetaObject::invokeMethod(m_listView, "itemAtIndex",
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Q_RETURN_ARG(QQuickItem*, item),
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Q_ARG(int, index));
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return item;
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}
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QQuickItem* ListViewFocusController::currentDelegate()
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{
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QQuickItem* result{nullptr};
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switch(m_currentSection) {
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case Section::Default: {
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qWarning() << "No elements...";
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break;
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}
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case Section::Header: {
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result = m_header;
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break;
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}
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case Section::Delegate: {
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result = itemAtIndex(m_delegateIndex);
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break;
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}
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case Section::Footer: {
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result = m_footer;
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break;
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}
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}
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return result;
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}
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QQuickItem* ListViewFocusController::focusedItem()
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{
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return m_focusedItem;
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}
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void ListViewFocusController::focusNextItem()
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{
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if (m_isReturnNeeded) {
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return;
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}
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if (m_focusChain.empty()) {
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qDebug() << "Empty focusChain with current delegate: " << currentDelegate() << "Scanning for elements...";
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m_focusChain = getSubChain(currentDelegate());
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}
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if (m_focusChain.empty()) {
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qWarning() << "No elements found. Returning from ListView...";
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nextElement();
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focusNextItem();
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return;
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}
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m_focusedItemIndex++;
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m_focusedItem = qobject_cast<QQuickItem*>(m_focusChain.at(m_focusedItemIndex));
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qDebug() << "==>> Focused Item: " << m_focusedItem << " with Index: " << m_focusedItemIndex;
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m_focusedItem->forceActiveFocus();
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}
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void ListViewFocusController::focusPreviousItem()
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{
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if (m_isReturnNeeded) {
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return;
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}
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if (m_focusChain.empty()) {
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qDebug() << "Empty focusChain with current delegate: " << currentDelegate() << "Scanning for elements...";
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m_focusChain = getSubChain(currentDelegate());
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}
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if (m_focusChain.empty()) {
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qWarning() << "No elements found. Returning from ListView...";
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previousElement();
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focusPreviousItem();
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return;
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}
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m_focusedItemIndex--;
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m_focusedItem = qobject_cast<QQuickItem*>(m_focusChain.at(m_focusedItemIndex));
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qDebug() << "==>> Focused Item: " << m_focusedItem << " with Index: " << m_focusedItemIndex;
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m_focusedItem->forceActiveFocus();
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}
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void ListViewFocusController::resetFocusChain()
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{
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m_focusChain.clear();
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m_focusedItem = nullptr;
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m_focusedItemIndex = -1;
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}
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bool ListViewFocusController::isFirstFocusItemInDelegate()
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{
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return m_focusedItem && (m_focusedItem == m_focusChain.first());
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}
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bool ListViewFocusController::isLastFocusItemInDelegate()
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{
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return m_focusedItem && (m_focusedItem == m_focusChain.last());
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}
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bool ListViewFocusController::isFirstFocusItemInListView()
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{
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return (m_delegateIndex == 0) && isFirstFocusItemInDelegate();
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}
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bool ListViewFocusController::isLastFocusItemInListView()
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{
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bool isLastSection = (m_footer && m_currentSection == Section::Footer)
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|| (!m_footer && (m_currentSection == Section::Delegate) && (m_delegateIndex == size() - 1))
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|| (m_header && (m_currentSection == Section::Header) && (size() <= 0) && !m_footer);
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return isLastSection && isLastFocusItemInDelegate();
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}
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bool ListViewFocusController::isReturnNeeded()
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{
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return m_isReturnNeeded;
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}
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void ListViewFocusController::viewToBegin()
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{
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QMetaObject::invokeMethod(m_listView, "positionViewAtBeginning", Qt::AutoConnection);
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}
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void ListViewFocusController::viewToEnd()
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{
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QMetaObject::invokeMethod(m_listView, "positionViewAtEnd", Qt::AutoConnection);
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}
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