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#include "library/treeitemmodel.h"
#include "library/treeitem.h"
/*
* Just a word about how the TreeItem objects and TreeItemModels are used in general:
* TreeItems are used by the TreeItemModel class to display tree
* structures in the sidebar.
*
* The constructor has 4 arguments:
* 1. argument represents a name shown in the sidebar view later on
* 2. argument represents the absolute path of this tree item
* 3. argument is a library feature object.
* This is necessary because in sidebar.cpp we hanlde 'activateChid' events
* 4. the parent TreeItem object
* The constructor does not add this TreeItem object to the parent's child list
*
* In case of no arguments, the standard constructor creates a
* root item that is not visible in the sidebar.
*
* Once the TreeItem objects are inserted to models, the models take care of their
* deletion.
*
* Examples on how to use TreeItem and TreeItemModels can be found in
* - playlistfeature.cpp
* - cratefeature.cpp
* - *feature.cpp
*/
TreeItemModel::TreeItemModel(QObject *parent)
: QAbstractItemModel(parent),
m_pRootItem(std::make_unique<TreeItem>()) {
}
TreeItemModel::~TreeItemModel() {
}
//Our Treeview Model supports exactly a single column
int TreeItemModel::columnCount(const QModelIndex &parent) const {
Q_UNUSED(parent);
return 1;
}
QVariant TreeItemModel::data(const QModelIndex &index, int role) const {
if (!index.isValid()) {
return QVariant();
}
TreeItem *item = static_cast<TreeItem*>(index.internalPointer());
// We use Qt::UserRole to ask for the data.
switch (role) {
case Qt::DisplayRole:
return item->getLabel();
case kDataRole:
return item->getData();
case kBoldRole:
return item->isBold();
default:
return QVariant();
}
}
bool TreeItemModel::setData(const QModelIndex &a_rIndex,
const QVariant &a_rValue, int a_iRole) {
// Get the item referred to by this index.
TreeItem *pItem = static_cast<TreeItem*>(a_rIndex.internalPointer());
if (pItem == nullptr) {
return false;
}
// Set the relevant data.
switch (a_iRole) {
case Qt::DisplayRole:
pItem->setLabel(a_rValue.toString());
break;
case kDataRole:
pItem->setData(a_rValue);
break;
case kBoldRole:
pItem->setBold(a_rValue.toBool());
break;
default:
return false;
}
emit(dataChanged(a_rIndex, a_rIndex));
return true;
}
Qt::ItemFlags TreeItemModel::flags(const QModelIndex &index) const {
if (index.isValid()) {
return Qt::ItemIsEnabled | Qt::ItemIsSelectable;
} else {
return 0;
}
}
QVariant TreeItemModel::headerData(int section, Qt::Orientation orientation, int role) const {
Q_UNUSED(section);
Q_UNUSED(orientation);
Q_UNUSED(role);
return QVariant();
}
QModelIndex TreeItemModel::index(int row, int column, const QModelIndex &parent) const {
if (!hasIndex(row, column, parent)) {
return QModelIndex();
}
TreeItem *parentItem;
if (parent.isValid()) {
parentItem = static_cast<TreeItem*>(parent.internalPointer());
} else {
parentItem = getRootItem();
}
TreeItem *childItem = parentItem->child(row);
if (childItem) {
return createIndex(row, column, childItem);
} else {
return QModelIndex();
}
}
QModelIndex TreeItemModel::parent(const QModelIndex& index) const {
if (!index.isValid()) {
return QModelIndex();
}
TreeItem *childItem = static_cast<TreeItem*>(index.internalPointer());
TreeItem *parentItem = childItem->parent();
if (parentItem == getRootItem()) {
return QModelIndex();
} else {
return createIndex(parentItem->parentRow(), 0, parentItem);
}
}
int TreeItemModel::rowCount(const QModelIndex& parent) const {
if (parent.column() > 0) {
return 0;
}
TreeItem* parentItem;
if (parent.isValid()) {
parentItem = static_cast<TreeItem*>(parent.internalPointer());
} else {
parentItem = getRootItem();
}
return parentItem->childRows();
}
/**
* Populates the model and notifies the view.
* Call this method first, before you do call any other methods.
*/
TreeItem* TreeItemModel::setRootItem(std::unique_ptr<TreeItem> pRootItem) {
m_pRootItem = std::move(pRootItem);
reset();
return getRootItem();
}
/**
* Before you can resize the data model dynamically by using 'insertRows' and 'removeRows'
* make sure you have initialized
*/
bool TreeItemModel::insertRows(QList<TreeItem*> &data, int position, int rows, const QModelIndex &parent) {
if (rows == 0) {
return true;
}
TreeItem *parentItem = getItem(parent);
beginInsertRows(parent, position, position + rows - 1);
parentItem->insertChildren(data, position, rows);
endInsertRows();
return true;
}
bool TreeItemModel::removeRows(int position, int rows, const QModelIndex &parent) {
if (rows == 0) {
return true;
}
TreeItem *parentItem = getItem(parent);
beginRemoveRows(parent, position, position + rows - 1);
parentItem->removeChildren(position, rows);
endRemoveRows();
return true;
}
TreeItem* TreeItemModel::getItem(const QModelIndex &index) const {
if (index.isValid()) {
TreeItem* pItem = static_cast<TreeItem*>(index.internalPointer());
if (pItem != nullptr) {
return pItem;
}
}
return getRootItem();
}
void TreeItemModel::triggerRepaint() {
QModelIndex left = index(0, 0);
QModelIndex right = index(rowCount() - 1, columnCount() - 1);
emit(dataChanged(left, right));
}
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