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/*
scenemodel.cpp
This file is part of GammaRay, the Qt application inspection and manipulation tool.
SPDX-FileCopyrightText: 2010 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
Author: Volker Krause <volker.krause@kdab.com>
SPDX-License-Identifier: GPL-2.0-or-later
Contact KDAB at <info@kdab.com> for commercial licensing options.
*/
#include "scenemodel.h"
#include <common/objectmodel.h>
#include <common/objectid.h>
#include <QApplication>
#include <QGraphicsItem>
#include <QGraphicsScene>
#include <QPalette>
using namespace GammaRay;
#define QGV_ITEMTYPE(Type) \
{ \
Type t; \
m_typeNames.insert(t.type(), QStringLiteral(#Type)); \
}
SceneModel::SceneModel(QObject *parent)
: QAbstractItemModel(parent)
, m_scene(nullptr)
{
QGV_ITEMTYPE(QGraphicsLineItem)
QGV_ITEMTYPE(QGraphicsPixmapItem)
QGV_ITEMTYPE(QGraphicsRectItem)
QGV_ITEMTYPE(QGraphicsEllipseItem)
QGV_ITEMTYPE(QGraphicsPathItem)
QGV_ITEMTYPE(QGraphicsPolygonItem)
QGV_ITEMTYPE(QGraphicsSimpleTextItem)
QGV_ITEMTYPE(QGraphicsItemGroup)
}
void SceneModel::setScene(QGraphicsScene *scene)
{
beginResetModel();
m_scene = scene;
endResetModel();
}
QGraphicsScene *SceneModel::scene() const
{
return m_scene;
}
QVariant SceneModel::data(const QModelIndex &index, int role) const
{
if (!index.isValid())
return QVariant();
QGraphicsItem *item = static_cast<QGraphicsItem *>(index.internalPointer());
if (item && role == Qt::DisplayRole) {
QGraphicsObject *obj = item->toGraphicsObject();
if (index.column() == 0) {
if (obj && !obj->objectName().isEmpty())
return obj->objectName();
return QStringLiteral("0x%1").arg(QString::number(reinterpret_cast<qlonglong>(item), 16));
} else if (index.column() == 1) {
if (obj)
return obj->metaObject()->className();
return typeName(item->type());
}
} else if (role == SceneItemRole) {
return QVariant::fromValue(item);
} else if (item && role == Qt::ForegroundRole) {
if (!item->isVisible())
return qApp->palette().color(QPalette::Disabled, QPalette::Text);
} else if (item && role == ObjectModel::ObjectIdRole) {
// TODO also handle the non-QObject case
return QVariant::fromValue(ObjectId(item->toGraphicsObject()));
}
return QVariant();
}
int SceneModel::columnCount(const QModelIndex &parent) const
{
Q_UNUSED(parent);
return 2;
}
int SceneModel::rowCount(const QModelIndex &parent) const
{
if (!m_scene)
return 0;
if (parent.isValid()) {
if (parent.column() != 0)
return 0;
QGraphicsItem *item = static_cast<QGraphicsItem *>(parent.internalPointer());
if (item)
return item->childItems().size();
else
return 0;
}
return topLevelItems().size();
}
// QGraphicsItem::childItems() sorts them by stacking order, which takes into account the
// items' insertion order, calls to QGraphicsItem::stackBefore(), and Z-values
// That's too prone to change under our feet without telling us, breaking model invariants
// So always just sort them... by pointer address, for lack of a better idea
namespace {
QList<QGraphicsItem *> sortedChildItems(QGraphicsItem *parent)
{
auto items = parent->childItems();
std::sort(items.begin(), items.end());
return items;
}
}
int SceneModel::rowForItem(QGraphicsItem *item) const
{
auto parent = item->parentItem();
if (parent)
return sortedChildItems(parent).indexOf(item);
else
return topLevelItems().indexOf(item);
}
QModelIndex SceneModel::parent(const QModelIndex &child) const
{
if (!child.isValid())
return {};
QGraphicsItem *item = static_cast<QGraphicsItem *>(child.internalPointer());
if (!item->parentItem())
return QModelIndex();
const int row = rowForItem(item->parentItem());
return createIndex(row, 0, item->parentItem());
}
QModelIndex SceneModel::index(int row, int column, const QModelIndex &parent) const
{
if (column < 0 || column >= columnCount())
return {};
if (!parent.isValid() && row >= 0 && row < topLevelItems().size())
return createIndex(row, column, topLevelItems().at(row));
QGraphicsItem *parentItem = static_cast<QGraphicsItem *>(parent.internalPointer());
if (!parentItem || row < 0 || row >= parentItem->childItems().size())
return QModelIndex();
return createIndex(row, column, sortedChildItems(parentItem).at(row));
}
QList<QGraphicsItem *> SceneModel::topLevelItems() const
{
QList<QGraphicsItem *> topLevel;
if (!m_scene)
return topLevel;
const auto allItems = m_scene->items();
const auto isTopLevel = [](QGraphicsItem *item) { return !item->parentItem(); };
std::copy_if(allItems.begin(), allItems.end(), std::back_inserter(topLevel), isTopLevel);
std::sort(topLevel.begin(), topLevel.end());
return topLevel;
}
QVariant SceneModel::headerData(int section, Qt::Orientation orientation, int role) const
{
if (role == Qt::DisplayRole && orientation == Qt::Horizontal) {
switch (section) {
case 0:
return tr("Item");
case 1:
return tr("Type");
}
}
return QAbstractItemModel::headerData(section, orientation, role);
}
QString SceneModel::typeName(int itemType) const
{
auto it = m_typeNames.find(itemType);
if (it != m_typeNames.end())
return it.value();
if (itemType == QGraphicsItem::UserType)
return QStringLiteral("UserType");
if (itemType > QGraphicsItem::UserType) {
return QStringLiteral("UserType + %1").arg(itemType - static_cast<int>(QGraphicsItem::UserType));
}
return QString::number(itemType);
}
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