/****************************************************************************
 **
 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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 **
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of a Qt Solutions component.
 **
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 **
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 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
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 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
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 **     the names of its contributors may be used to endorse or promote
 **     products derived from this software without specific prior written
 **     permission.
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#pragma GCC diagnostic ignored "-Wswitch-default"
#pragma GCC diagnostic ignored "-Wfloat-equal"
#pragma GCC diagnostic ignored "-Wshadow"

#include <QtCore/QSet>
#include <QtCore/QTimer>
#include <QtCore/QMap>
#include <QtGui/QStyle>

#include "qtbuttonpropertybrowser.h"

#if QT_VERSION >= 0x040400
QT_BEGIN_NAMESPACE
#endif



QToolButton *QtButtonPropertyBrowserPrivate::createButton(QWidget *parent) const
{
  QToolButton *button = new QToolButton(parent);
  button->setCheckable(true);
  button->setSizePolicy(QSizePolicy(QSizePolicy::Preferred,
        QSizePolicy::Fixed));
  button->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
  button->setArrowType(Qt::DownArrow);
  button->setIconSize(QSize(3, 16));
  /*
     QIcon icon;
     icon.addPixmap(q_ptr->style()->standardPixmap(QStyle::SP_ArrowDown),
     QIcon::Normal, QIcon::Off);
     icon.addPixmap(q_ptr->style()->standardPixmap(QStyle::SP_ArrowUp),
     QIcon::Normal, QIcon::On);
     button->setIcon(icon);
     */
  return button;
}

int QtButtonPropertyBrowserPrivate::gridRow(WidgetItem *item) const
{
  QList<WidgetItem *> siblings;
  if (item->parent)
    siblings = item->parent->children;
  else
    siblings = m_children;

  int row = 0;
  QListIterator<WidgetItem *> it(siblings);
  while (it.hasNext())
  {
    WidgetItem *sibling = it.next();
    if (sibling == item)
      return row;
    row += gridSpan(sibling);
  }
  return -1;
}

int QtButtonPropertyBrowserPrivate::gridSpan(WidgetItem *item) const
{
  if (item->container && item->expanded)
    return 2;
  return 1;
}

void QtButtonPropertyBrowserPrivate::init(QWidget *parent)
{
  m_mainLayout = new QGridLayout();
  parent->setLayout(m_mainLayout);
  QLayoutItem *item = new QSpacerItem(0, 0,
      QSizePolicy::Fixed, QSizePolicy::Expanding);
  m_mainLayout->addItem(item, 0, 0);
}

void QtButtonPropertyBrowserPrivate::slotEditorDestroyed()
{
  QWidget *editor = qobject_cast<QWidget *>(q_ptr->sender());
  if (!editor)
    return;
  if (!m_widgetToItem.contains(editor))
    return;
  m_widgetToItem[editor]->widget = 0;
  m_widgetToItem.remove(editor);
}

void QtButtonPropertyBrowserPrivate::slotUpdate()
{
  QListIterator<WidgetItem *> itItem(m_recreateQueue);
  while (itItem.hasNext())
  {
    WidgetItem *item = itItem.next();

    WidgetItem *parent = item->parent;
    QWidget *w = 0;
    QGridLayout *l = 0;
    const int oldRow = gridRow(item);
    if (parent)
    {
      w = parent->container;
      l = parent->layout;
    }
    else
    {
      w = q_ptr;
      l = m_mainLayout;
    }

    int span = 1;
    if (!item->widget && !item->widgetLabel)
      span = 2;
    item->label = new QLabel(w);
    item->label->setSizePolicy(QSizePolicy(QSizePolicy::Fixed,
          QSizePolicy::Fixed));
    l->addWidget(item->label, oldRow, 0, 1, span);

    updateItem(item);
  }
  m_recreateQueue.clear();
}

void QtButtonPropertyBrowserPrivate::setExpanded(WidgetItem *item,
    bool expanded)
{
  if (item->expanded == expanded)
    return;

  if (!item->container)
    return;

  item->expanded = expanded;
  const int row = gridRow(item);
  WidgetItem *parent = item->parent;
  QGridLayout *l = 0;
  if (parent)
    l = parent->layout;
  else
    l = m_mainLayout;

  if (expanded)
  {
    insertRow(l, row + 1);
    l->addWidget(item->container, row + 1, 0, 1, 2);
    item->container->show();
  }
  else
  {
    l->removeWidget(item->container);
    item->container->hide();
    removeRow(l, row + 1);
  }

  item->button->setChecked(expanded);
  item->button->setArrowType(expanded ? Qt::UpArrow : Qt::DownArrow);
}

void QtButtonPropertyBrowserPrivate::slotToggled(bool checked)
{
  WidgetItem *item = m_buttonToItem.value(q_ptr->sender());
  if (!item)
    return;

  setExpanded(item, checked);

  if (checked)
    emit q_ptr->expanded(m_itemToIndex.value(item));
  else
    emit q_ptr->collapsed(m_itemToIndex.value(item));
}

void QtButtonPropertyBrowserPrivate::updateLater()
{
  QTimer::singleShot(0, q_ptr, SLOT(slotUpdate()));
}

void QtButtonPropertyBrowserPrivate::propertyInserted(QtBrowserItem *index,
    QtBrowserItem *afterIndex)
{
  WidgetItem *afterItem = m_indexToItem.value(afterIndex);
  WidgetItem *parentItem = m_indexToItem.value(index->parent());

  WidgetItem *newItem = new WidgetItem();
  newItem->parent = parentItem;

  QGridLayout *layout = 0;
  QWidget *parentWidget = 0;
  int row = -1;
  if (!afterItem)
  {
    row = 0;
    if (parentItem)
      parentItem->children.insert(0, newItem);
    else
      m_children.insert(0, newItem);
  }
  else
  {
    row = gridRow(afterItem) + gridSpan(afterItem);
    if (parentItem)
      parentItem->children.insert(parentItem->children.indexOf(afterItem) + 1,
          newItem);
    else
      m_children.insert(m_children.indexOf(afterItem) + 1, newItem);
  }

  if (!parentItem)
  {
    layout = m_mainLayout;
    parentWidget = q_ptr;
  }
  else
  {
    if (!parentItem->container)
    {
      m_recreateQueue.removeAll(parentItem);
      WidgetItem *grandParent = parentItem->parent;
      // QWidget *w = 0;
      QGridLayout *l = 0;
      const int oldRow = gridRow(parentItem);
      if (grandParent)
      {
        // w = grandParent->container;
        l = grandParent->layout;
      }
      else
      {
        // w = q_ptr;
        l = m_mainLayout;
      }
      QFrame *container = new QFrame();
      container->setFrameShape(QFrame::Panel);
      container->setFrameShadow(QFrame::Raised);
      parentItem->container = container;
      parentItem->button = createButton();
      m_buttonToItem[parentItem->button] = parentItem;
      q_ptr->connect(parentItem->button, SIGNAL(toggled(bool)), q_ptr,
          SLOT(slotToggled(bool)));
      parentItem->layout = new QGridLayout();
      container->setLayout(parentItem->layout);
      if (parentItem->label)
      {
        l->removeWidget(parentItem->label);
        delete parentItem->label;
        parentItem->label = 0;
      }
      int span = 1;
      if (!parentItem->widget && !parentItem->widgetLabel)
        span = 2;
      l->addWidget(parentItem->button, oldRow, 0, 1, span);
      updateItem(parentItem);
    }
    layout = parentItem->layout;
    parentWidget = parentItem->container;
  }

  newItem->label = new QLabel(parentWidget);
  newItem->label->setSizePolicy(QSizePolicy(QSizePolicy::Fixed,
        QSizePolicy::Fixed));
  newItem->widget = createEditor(index->property(), parentWidget);
  if (newItem->widget)
  {
    QObject::connect(newItem->widget, SIGNAL(destroyed()), q_ptr,
        SLOT(slotEditorDestroyed()));
    m_widgetToItem[newItem->widget] = newItem;
  }
  else if (index->property()->hasValue())
  {
    newItem->widgetLabel = new QLabel(parentWidget);
    newItem->widgetLabel->setSizePolicy(QSizePolicy(QSizePolicy::Ignored,
          QSizePolicy::Fixed));
  }

  insertRow(layout, row);
  int span = 1;
  if (newItem->widget)
    layout->addWidget(newItem->widget, row, 1);
  else if (newItem->widgetLabel)
    layout->addWidget(newItem->widgetLabel, row, 1);
  else
    span = 2;
  layout->addWidget(newItem->label, row, 0, span, 1);

  m_itemToIndex[newItem] = index;
  m_indexToItem[index] = newItem;

  updateItem(newItem);
}

void QtButtonPropertyBrowserPrivate::propertyRemoved(QtBrowserItem *index)
{
  WidgetItem *item = m_indexToItem.value(index);

  m_indexToItem.remove(index);
  m_itemToIndex.remove(item);

  WidgetItem *parentItem = item->parent;

  const int row = gridRow(item);

  if (parentItem)
    parentItem->children.removeAt(parentItem->children.indexOf(item));
  else
    m_children.removeAt(m_children.indexOf(item));

  const int colSpan = gridSpan(item);

  m_buttonToItem.remove(item->button);

  if (item->widget)
    delete item->widget;
  if (item->label)
    delete item->label;
  if (item->widgetLabel)
    delete item->widgetLabel;
  if (item->button)
    delete item->button;
  if (item->container)
    delete item->container;

  if (!parentItem)
  {
    removeRow(m_mainLayout, row);
    if (colSpan > 1)
      removeRow(m_mainLayout, row);
  }
  else if (parentItem->children.count() != 0)
  {
    removeRow(parentItem->layout, row);
    if (colSpan > 1)
      removeRow(parentItem->layout, row);
  }
  else
  {
    const WidgetItem *grandParent = parentItem->parent;
    QGridLayout *l = 0;
    if (grandParent)
    {
      l = grandParent->layout;
    }
    else
    {
      l = m_mainLayout;
    }

    const int parentRow = gridRow(parentItem);
    const int parentSpan = gridSpan(parentItem);

    l->removeWidget(parentItem->button);
    l->removeWidget(parentItem->container);
    delete parentItem->button;
    delete parentItem->container;
    parentItem->button = 0;
    parentItem->container = 0;
    parentItem->layout = 0;
    if (!m_recreateQueue.contains(parentItem))
      m_recreateQueue.append(parentItem);
    if (parentSpan > 1)
      removeRow(l, parentRow + 1);

    updateLater();
  }
  m_recreateQueue.removeAll(item);

  delete item;
}

void QtButtonPropertyBrowserPrivate::insertRow(QGridLayout *layout,
    int row) const
{
  QMap<QLayoutItem *, QRect> itemToPos;
  int idx = 0;
  while (idx < layout->count())
  {
    int r, c, rs, cs;
    layout->getItemPosition(idx, &r, &c, &rs, &cs);
    if (r >= row)
    {
      itemToPos[layout->takeAt(idx)] = QRect(r + 1, c, rs, cs);
    }
    else
    {
      idx++;
    }
  }

  const QMap<QLayoutItem *, QRect>::ConstIterator icend =  itemToPos.constEnd();
  for (QMap<QLayoutItem *,
      QRect>::ConstIterator it = itemToPos.constBegin(); it != icend; ++it)
  {
    const QRect r = it.value();
    layout->addItem(it.key(), r.x(), r.y(), r.width(), r.height());
  }
}

void QtButtonPropertyBrowserPrivate::removeRow(QGridLayout *layout,
    int row) const
{
  QMap<QLayoutItem *, QRect> itemToPos;
  int idx = 0;
  while (idx < layout->count())
  {
    int r, c, rs, cs;
    layout->getItemPosition(idx, &r, &c, &rs, &cs);
    if (r > row)
    {
      itemToPos[layout->takeAt(idx)] = QRect(r - 1, c, rs, cs);
    }
    else
    {
      idx++;
    }
  }

  const QMap<QLayoutItem *, QRect>::ConstIterator icend =  itemToPos.constEnd();
  for (QMap<QLayoutItem *,
      QRect>::ConstIterator it = itemToPos.constBegin(); it != icend; ++it)
  {
    const QRect r = it.value();
    layout->addItem(it.key(), r.x(), r.y(), r.width(), r.height());
  }
}

void QtButtonPropertyBrowserPrivate::propertyChanged(QtBrowserItem *index)
{
  WidgetItem *item = m_indexToItem.value(index);

  updateItem(item);
}

void QtButtonPropertyBrowserPrivate::updateItem(WidgetItem *item)
{
  QtProperty *property = m_itemToIndex[item]->property();
  if (item->button)
  {
    QFont font = item->button->font();
    font.setUnderline(property->isModified());
    item->button->setFont(font);
    item->button->setText(property->propertyName());
    item->button->setToolTip(property->toolTip());
    item->button->setStatusTip(property->statusTip());
    item->button->setWhatsThis(property->whatsThis());
    item->button->setEnabled(property->isEnabled());
  }
  if (item->label)
  {
    QFont font = item->label->font();
    font.setUnderline(property->isModified());
    item->label->setFont(font);
    item->label->setText(property->propertyName());
    item->label->setToolTip(property->toolTip());
    item->label->setStatusTip(property->statusTip());
    item->label->setWhatsThis(property->whatsThis());
    item->label->setEnabled(property->isEnabled());
  }
  if (item->widgetLabel)
  {
    QFont font = item->widgetLabel->font();
    font.setUnderline(false);
    item->widgetLabel->setFont(font);
    item->widgetLabel->setText(property->valueText());
    item->widgetLabel->setToolTip(property->valueText());
    item->widgetLabel->setEnabled(property->isEnabled());
  }
  if (item->widget)
  {
    QFont font = item->widget->font();
    font.setUnderline(false);
    item->widget->setFont(font);
    item->widget->setEnabled(property->isEnabled());
    item->widget->setToolTip(property->valueText());
  }
}



/*!
  \class QtButtonPropertyBrowser

  \brief The QtButtonPropertyBrowser class provides a drop down QToolButton
  based property browser.

  A property browser is a widget that enables the user to edit a
  given set of properties. Each property is represented by a label
  specifying the property's name, and an editing widget (e.g. a line
  edit or a combobox) holding its value. A property can have zero or
  more subproperties.

  QtButtonPropertyBrowser provides drop down button for all nested
  properties, i.e. subproperties are enclosed by a container associated with

  the drop down button. The parent property's name is displayed as button text. For example:

  \image qtbuttonpropertybrowser.png

  Use the QtAbstractPropertyBrowser API to add, insert and remove
  properties from an instance of the QtButtonPropertyBrowser
  class. The properties themselves are created and managed by
  implementations of the QtAbstractPropertyManager class.

  \sa QtTreePropertyBrowser, QtAbstractPropertyBrowser
  */

/*!
  \fn void QtButtonPropertyBrowser::collapsed(QtBrowserItem *item)

  This signal is emitted when the \a item is collapsed.

  \sa expanded(), setExpanded()
  */

/*!
  \fn void QtButtonPropertyBrowser::expanded(QtBrowserItem *item)

  This signal is emitted when the \a item is expanded.

  \sa collapsed(), setExpanded()
  */

/*!
  Creates a property browser with the given \a parent.
  */
  QtButtonPropertyBrowser::QtButtonPropertyBrowser(QWidget *parent)
: QtAbstractPropertyBrowser(parent)
{
  d_ptr = new QtButtonPropertyBrowserPrivate;
  d_ptr->q_ptr = this;

  d_ptr->init(this);
}

/*!
  Destroys this property browser.

  Note that the properties that were inserted into this browser are
  \e not destroyed since they may still be used in other
  browsers. The properties are owned by the manager that created
  them.

  \sa QtProperty, QtAbstractPropertyManager
  */
QtButtonPropertyBrowser::~QtButtonPropertyBrowser()
{
  const QMap<QtButtonPropertyBrowserPrivate::WidgetItem *,
        QtBrowserItem *>::ConstIterator icend = d_ptr->m_itemToIndex.constEnd();
  for (QMap<QtButtonPropertyBrowserPrivate::WidgetItem *,
      QtBrowserItem *>::ConstIterator  it =  d_ptr->m_itemToIndex.constBegin();
      it != icend; ++it)
    delete it.key();
  delete d_ptr;
}

/*!
  \reimp
  */
void QtButtonPropertyBrowser::itemInserted(QtBrowserItem *item,
    QtBrowserItem *afterItem)
{
  d_ptr->propertyInserted(item, afterItem);
}

/*!
  \reimp
  */
void QtButtonPropertyBrowser::itemRemoved(QtBrowserItem *item)
{
  d_ptr->propertyRemoved(item);
}

/*!
  \reimp
  */
void QtButtonPropertyBrowser::itemChanged(QtBrowserItem *item)
{
  d_ptr->propertyChanged(item);
}

/*!
  Sets the \a item to either collapse or expanded,
  depending on the value of \a expanded.

  \sa isExpanded(), expanded(), collapsed()
  */

void QtButtonPropertyBrowser::setExpanded(QtBrowserItem *item, bool expanded)
{
  QtButtonPropertyBrowserPrivate::WidgetItem *itm =
    d_ptr->m_indexToItem.value(item);
  if (itm)
    d_ptr->setExpanded(itm, expanded);
}

/*!
  Returns true if the \a item is expanded; otherwise returns false.

  \sa setExpanded()
  */

bool QtButtonPropertyBrowser::isExpanded(QtBrowserItem *item) const
{
  QtButtonPropertyBrowserPrivate::WidgetItem *itm =
    d_ptr->m_indexToItem.value(item);
  if (itm)
    return itm->expanded;
  return false;
}

#if QT_VERSION >= 0x040400
QT_END_NAMESPACE
#endif

// #include "moc_qtbuttonpropertybrowser.cxx"
