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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#include "flamegraph.h"
namespace FlameGraph {
FlameGraph::FlameGraph(QQuickItem *parent) :
QQuickItem(parent)
{
setAcceptedMouseButtons(Qt::LeftButton);
// Queue the rebuild in this case so that a delegate can set the root without getting deleted
// during the call.
connect(this, &FlameGraph::rootChanged, this, &FlameGraph::rebuild, Qt::QueuedConnection);
}
QQmlComponent *FlameGraph::delegate() const
{
return m_delegate;
}
void FlameGraph::setDelegate(QQmlComponent *delegate)
{
if (delegate != m_delegate) {
m_delegate = delegate;
emit delegateChanged(delegate);
}
}
QAbstractItemModel *FlameGraph::model() const
{
return m_model;
}
void FlameGraph::setModel(QAbstractItemModel *model)
{
if (model != m_model) {
if (m_model)
disconnect(m_model, &QAbstractItemModel::modelReset, this, &FlameGraph::rebuild);
m_model = model;
if (m_model)
connect(m_model, &QAbstractItemModel::modelReset, this, &FlameGraph::rebuild);
emit modelChanged(model);
rebuild();
}
}
int FlameGraph::sizeRole() const
{
return m_sizeRole;
}
void FlameGraph::setSizeRole(int sizeRole)
{
if (sizeRole != m_sizeRole) {
m_sizeRole = sizeRole;
emit sizeRoleChanged(sizeRole);
rebuild();
}
}
qreal FlameGraph::sizeThreshold() const
{
return m_sizeThreshold;
}
void FlameGraph::setSizeThreshold(qreal sizeThreshold)
{
if (sizeThreshold != m_sizeThreshold) {
m_sizeThreshold = sizeThreshold;
emit sizeThresholdChanged(sizeThreshold);
rebuild();
}
}
int FlameGraph::depth() const
{
return m_depth;
}
FlameGraphAttached *FlameGraph::qmlAttachedProperties(QObject *object)
{
FlameGraphAttached *attached =
object->findChild<FlameGraphAttached *>(QString(), Qt::FindDirectChildrenOnly);
if (!attached)
attached = new FlameGraphAttached(object);
return attached;
}
QObject *FlameGraph::appendChild(QObject *parentObject, QQuickItem *parentItem,
QQmlContext *context, const QModelIndex &childIndex,
qreal position, qreal size)
{
QObject *childObject = m_delegate->beginCreate(context);
if (parentItem) {
QQuickItem *childItem = qobject_cast<QQuickItem *>(childObject);
if (childItem)
childItem->setParentItem(parentItem);
}
childObject->setParent(parentObject);
FlameGraphAttached *attached = FlameGraph::qmlAttachedProperties(childObject);
attached->setRelativePosition(position);
attached->setRelativeSize(size);
attached->setModelIndex(childIndex);
connect(m_model, &QAbstractItemModel::dataChanged,
attached, &FlameGraphAttached::modelIndexChanged);
m_delegate->completeCreate();
return childObject;
}
int FlameGraph::buildNode(const QModelIndex &parentIndex, QObject *parentObject, int depth,
int maximumDepth)
{
qreal position = 0;
qreal skipped = 0;
qreal parentSize = m_model->data(parentIndex, m_sizeRole).toReal();
QQuickItem *parentItem = qobject_cast<QQuickItem *>(parentObject);
QQmlContext *context = qmlContext(this);
int rowCount = m_model->rowCount(parentIndex);
int childrenDepth = depth;
if (depth == maximumDepth - 1) {
skipped = parentSize;
} else {
for (int row = 0; row < rowCount; ++row) {
QModelIndex childIndex = m_model->index(row, 0, parentIndex);
qreal size = m_model->data(childIndex, m_sizeRole).toReal();
if (size / m_model->data(m_root, m_sizeRole).toReal() < m_sizeThreshold) {
skipped += size;
continue;
}
QObject *childObject = appendChild(parentObject, parentItem, context, childIndex,
position / parentSize, size / parentSize);
position += size;
childrenDepth = qMax(childrenDepth, buildNode(childIndex, childObject, depth + 1,
maximumDepth));
}
}
// Invisible Root object: attribute all remaining width to "others"
if (!parentIndex.isValid())
skipped = parentSize - position;
if (skipped > 0) {
appendChild(parentObject, parentItem, context, QModelIndex(), position / parentSize,
skipped / parentSize);
childrenDepth = qMax(childrenDepth, depth + 1);
}
return childrenDepth;
}
void FlameGraph::rebuild()
{
qDeleteAll(childItems());
m_depth = 0;
if (!m_model) {
emit depthChanged(m_depth);
return;
}
if (m_model->data(m_root, m_sizeRole).toReal() > 0) {
if (m_root.isValid()) {
QObject *parentObject = appendChild(this, this, qmlContext(this), m_root, 0, 1);
m_depth = buildNode(m_root, parentObject, 1, m_maximumDepth);
} else {
m_depth = buildNode(m_root, this, 0, m_maximumDepth);
}
}
emit depthChanged(m_depth);
}
void FlameGraph::mousePressEvent(QMouseEvent *event)
{
Q_UNUSED(event)
}
void FlameGraph::mouseReleaseEvent(QMouseEvent *event)
{
Q_UNUSED(event)
setSelectedTypeId(-1);
}
void FlameGraph::mouseDoubleClickEvent(QMouseEvent *event)
{
Q_UNUSED(event)
setSelectedTypeId(-1);
resetRoot();
}
} // namespace FlameGraph
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