/**************************************************************************** ** ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the QtGui module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** No Commercial Usage ** This file contains pre-release code and may not be distributed. ** You may use this file in accordance with the terms and conditions ** contained in the Technology Preview License Agreement accompanying ** this package. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain additional ** rights. These rights are described in the Nokia Qt LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** If you have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** ** ** ** ** ** ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include #include "qtreewidget.h" #include "qtreewidget_p.h" #include "qwidgetitemdata_p.h" #ifndef QT_NO_TREEWIDGET QT_BEGIN_NAMESPACE /*! \class QTreeWidgetItemIterator \ingroup model-view \brief The QTreeWidgetItemIterator class provides a way to iterate over the items in a QTreeWidget instance. The iterator will walk the items in a pre-order traversal order, thus visiting the parent node \e before it continues to the child nodes. For example, the following code examples each item in a tree, checking the text in the first column against a user-specified search string: \snippet doc/src/snippets/qtreewidgetitemiterator-using/mainwindow.cpp 0 It is also possible to filter out certain types of node by passing certain \l{IteratorFlag}{flags} to the constructor of QTreeWidgetItemIterator. \sa QTreeWidget, {Model/View Programming}, QTreeWidgetItem */ /*! Constructs an iterator for the same QTreeWidget as \a it. The current iterator item is set to point on the current item of \a it. */ QTreeWidgetItemIterator::QTreeWidgetItemIterator(const QTreeWidgetItemIterator &it) : d_ptr(new QTreeWidgetItemIteratorPrivate(*(it.d_ptr))), current(it.current), flags(it.flags) { Q_D(QTreeWidgetItemIterator); Q_ASSERT(d->m_model); d->m_model->iterators.append(this); } /*! Constructs an iterator for the given \a widget that uses the specified \a flags to determine which items are found during iteration. The iterator is set to point to the first top-level item contained in the widget, or the next matching item if the top-level item doesn't match the flags. \sa QTreeWidgetItemIterator::IteratorFlag */ QTreeWidgetItemIterator::QTreeWidgetItemIterator(QTreeWidget *widget, IteratorFlags flags) : current(0), flags(flags) { Q_ASSERT(widget); QTreeModel *model = qobject_cast(widget->model()); Q_ASSERT(model); d_ptr = new QTreeWidgetItemIteratorPrivate(this, model); model->iterators.append(this); if (!model->rootItem->children.isEmpty()) current = model->rootItem->children.first(); if (current && !matchesFlags(current)) ++(*this); } /*! Constructs an iterator for the given \a item that uses the specified \a flags to determine which items are found during iteration. The iterator is set to point to \a item, or the next matching item if \a item doesn't match the flags. \sa QTreeWidgetItemIterator::IteratorFlag */ QTreeWidgetItemIterator::QTreeWidgetItemIterator(QTreeWidgetItem *item, IteratorFlags flags) : d_ptr(new QTreeWidgetItemIteratorPrivate( this, qobject_cast(item->view->model()))), current(item), flags(flags) { Q_D(QTreeWidgetItemIterator); Q_ASSERT(item); QTreeModel *model = qobject_cast(item->view->model()); Q_ASSERT(model); model->iterators.append(this); // Initialize m_currentIndex and m_parentIndex as it would be if we had traversed from // the beginning. QTreeWidgetItem *parent = item; parent = parent->parent(); QList children = parent ? parent->children : d->m_model->rootItem->children; d->m_currentIndex = children.indexOf(item); while (parent) { QTreeWidgetItem *itm = parent; parent = parent->parent(); QList children = parent ? parent->children : d->m_model->rootItem->children; int index = children.indexOf(itm); d->m_parentIndex.prepend(index); } if (current && !matchesFlags(current)) ++(*this); } /*! Destroys the iterator. */ QTreeWidgetItemIterator::~QTreeWidgetItemIterator() { d_func()->m_model->iterators.removeAll(this); delete d_ptr; } /*! Assignment. Makes a copy of \a it and returns a reference to its iterator. */ QTreeWidgetItemIterator &QTreeWidgetItemIterator::operator=(const QTreeWidgetItemIterator &it) { Q_D(QTreeWidgetItemIterator); if (d_func()->m_model != it.d_func()->m_model) { d_func()->m_model->iterators.removeAll(this); it.d_func()->m_model->iterators.append(this); } current = it.current; flags = it.flags; d->operator=(*it.d_func()); return *this; } /*! The prefix ++ operator (++it) advances the iterator to the next matching item and returns a reference to the resulting iterator. Sets the current pointer to 0 if the current item is the last matching item. */ QTreeWidgetItemIterator &QTreeWidgetItemIterator::operator++() { if (current) do { current = d_func()->next(current); } while (current && !matchesFlags(current)); return *this; } /*! The prefix -- operator (--it) advances the iterator to the previous matching item and returns a reference to the resulting iterator. Sets the current pointer to 0 if the current item is the first matching item. */ QTreeWidgetItemIterator &QTreeWidgetItemIterator::operator--() { if (current) do { current = d_func()->previous(current); } while (current && !matchesFlags(current)); return *this; } /*! \internal */ bool QTreeWidgetItemIterator::matchesFlags(const QTreeWidgetItem *item) const { if (!item) return false; if (flags == All) return true; { Qt::ItemFlags itemFlags = item->flags(); if ((flags & Selectable) && !(itemFlags & Qt::ItemIsSelectable)) return false; if ((flags & NotSelectable) && (itemFlags & Qt::ItemIsSelectable)) return false; if ((flags & DragEnabled) && !(itemFlags & Qt::ItemIsDragEnabled)) return false; if ((flags & DragDisabled) && (itemFlags & Qt::ItemIsDragEnabled)) return false; if ((flags & DropEnabled) && !(itemFlags & Qt::ItemIsDropEnabled)) return false; if ((flags & DropDisabled) && (itemFlags & Qt::ItemIsDropEnabled)) return false; if ((flags & Enabled) && !(itemFlags & Qt::ItemIsEnabled)) return false; if ((flags & Disabled) && (itemFlags & Qt::ItemIsEnabled)) return false; if ((flags & Editable) && !(itemFlags & Qt::ItemIsEditable)) return false; if ((flags & NotEditable) && (itemFlags & Qt::ItemIsEditable)) return false; } if (flags & (Checked|NotChecked)) { // ### We only test the check state for column 0 Qt::CheckState check = item->checkState(0); // PartiallyChecked matches as Checked. if ((flags & Checked) && (check == Qt::Unchecked)) return false; if ((flags & NotChecked) && (check != Qt::Unchecked)) return false; } if ((flags & HasChildren) && !item->childCount()) return false; if ((flags & NoChildren) && item->childCount()) return false; if ((flags & Hidden) && !item->isHidden()) return false; if ((flags & NotHidden) && item->isHidden()) return false; if ((flags & Selected) && !item->isSelected()) return false; if ((flags & Unselected) && item->isSelected()) return false; return true; } /* * Implementation of QTreeWidgetItemIteratorPrivate */ QTreeWidgetItem* QTreeWidgetItemIteratorPrivate::nextSibling(const QTreeWidgetItem* item) const { Q_ASSERT(item); QTreeWidgetItem *next = 0; if (QTreeWidgetItem *par = item->parent()) { int i = par->indexOfChild(const_cast(item)); next = par->child(i + 1); } else { QTreeWidget *tw = item->treeWidget(); int i = tw->indexOfTopLevelItem(const_cast(item)); next = tw->topLevelItem(i + 1); } return next; } QTreeWidgetItem *QTreeWidgetItemIteratorPrivate::next(const QTreeWidgetItem *current) { if (!current) return 0; QTreeWidgetItem *next = 0; if (current->childCount()) { // walk the child m_parentIndex.push(m_currentIndex); m_currentIndex = 0; next = current->child(0); } else { // walk the sibling QTreeWidgetItem *parent = current->parent(); next = parent ? parent->child(m_currentIndex + 1) : m_model->rootItem->child(m_currentIndex + 1); while (!next && parent) { // if we had no sibling walk up the parent and try the sibling of that parent = parent->parent(); m_currentIndex = m_parentIndex.pop(); next = parent ? parent->child(m_currentIndex + 1) : m_model->rootItem->child(m_currentIndex + 1); } if (next) ++(m_currentIndex); } return next; } QTreeWidgetItem *QTreeWidgetItemIteratorPrivate::previous(const QTreeWidgetItem *current) { if (!current) return 0; QTreeWidgetItem *prev = 0; // walk the previous sibling QTreeWidgetItem *parent = current->parent(); prev = parent ? parent->child(m_currentIndex - 1) : m_model->rootItem->child(m_currentIndex - 1); if (prev) { // Yes, we had a previous sibling but we need go down to the last leafnode. --m_currentIndex; while (prev && prev->childCount()) { m_parentIndex.push(m_currentIndex); m_currentIndex = prev->childCount() - 1; prev = prev->child(m_currentIndex); } } else if (parent) { m_currentIndex = m_parentIndex.pop(); prev = parent; } return prev; } void QTreeWidgetItemIteratorPrivate::ensureValidIterator(const QTreeWidgetItem *itemToBeRemoved) { Q_Q(QTreeWidgetItemIterator); Q_ASSERT(itemToBeRemoved); if (!q->current) return; QTreeWidgetItem *nextItem = q->current; // Do not walk to the ancestor to find the other item if they have the same parent. if (nextItem->parent() != itemToBeRemoved->parent()) { while (nextItem->parent() && nextItem != itemToBeRemoved) { nextItem = nextItem->parent(); } } // If the item to be removed is an ancestor of the current iterator item, // we need to adjust the iterator. if (nextItem == itemToBeRemoved) { QTreeWidgetItem *parent = nextItem; nextItem = 0; while (parent && !nextItem) { nextItem = nextSibling(parent); parent = parent->parent(); } if (nextItem) { // Ooooh... Set the iterator to the next valid item *q = QTreeWidgetItemIterator(nextItem, q->flags); if (!(q->matchesFlags(nextItem))) ++(*q); } else { // set it to null. q->current = 0; m_parentIndex.clear(); return; } } if (nextItem->parent() == itemToBeRemoved->parent()) { // They have the same parent, i.e. we have to adjust the m_currentIndex member of the iterator // if the deleted item is to the left of the nextItem. QTreeWidgetItem *par = itemToBeRemoved->parent(); // We know they both have the same parent. QTreeWidget *tw = itemToBeRemoved->treeWidget(); // ..and widget int indexOfItemToBeRemoved = par ? par->indexOfChild(const_cast(itemToBeRemoved)) : tw->indexOfTopLevelItem(const_cast(itemToBeRemoved)); int indexOfNextItem = par ? par->indexOfChild(nextItem) : tw->indexOfTopLevelItem(nextItem); if (indexOfItemToBeRemoved <= indexOfNextItem) { // A sibling to the left of us was deleted, adjust the m_currentIndex member of the iterator. // Note that the m_currentIndex will be wrong until the item is actually removed! m_currentIndex--; } } } /*! \fn const QTreeWidgetItemIterator QTreeWidgetItemIterator::operator++(int) The postfix ++ operator (it++) advances the iterator to the next matching item and returns an iterator to the previously current item. */ /*! \fn QTreeWidgetItemIterator &QTreeWidgetItemIterator::operator+=(int n) Makes the iterator go forward by \a n matching items. (If n is negative, the iterator goes backward.) If the current item is beyond the last item, the current item pointer is set to 0. Returns the resulting iterator. */ /*! \fn const QTreeWidgetItemIterator QTreeWidgetItemIterator::operator--(int) The postfix -- operator (it--) makes the preceding matching item current and returns an iterator to the previously current item. */ /*! \fn QTreeWidgetItemIterator &QTreeWidgetItemIterator::operator-=(int n) Makes the iterator go backward by \a n matching items. (If n is negative, the iterator goes forward.) If the current item is ahead of the last item, the current item pointer is set to 0. Returns the resulting iterator. */ /*! \fn QTreeWidgetItem *QTreeWidgetItemIterator::operator*() const Dereference operator. Returns a pointer to the current item. */ /*! \enum QTreeWidgetItemIterator::IteratorFlag These flags can be passed to a QTreeWidgetItemIterator constructor (OR-ed together if more than one is used), so that the iterator will only iterate over items that match the given flags. \value All \value Hidden \value NotHidden \value Selected \value Unselected \value Selectable \value NotSelectable \value DragEnabled \value DragDisabled \value DropEnabled \value DropDisabled \value HasChildren \value NoChildren \value Checked \value NotChecked \value Enabled \value Disabled \value Editable \value NotEditable \value UserFlag */ QT_END_NAMESPACE #endif // QT_NO_TREEWIDGET