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/***************************************************************************
* Copyright (C) 2011 by Peter Penz <[email protected]> *
* *
* Based on the Itemviews NG project from Trolltech Labs: *
* http://qt.gitorious.org/qt-labs/itemviews-ng *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
***************************************************************************/
#include "kitemlistselectionmanager.h"
#include "kitemmodelbase.h"
#include <KDebug>
KItemListSelectionManager::KItemListSelectionManager(QObject* parent) :
QObject(parent),
m_currentItem(-1),
m_anchorItem(-1),
m_selectedItems(),
m_model(0)
{
}
KItemListSelectionManager::~KItemListSelectionManager()
{
}
void KItemListSelectionManager::setCurrentItem(int current)
{
const int previous = m_currentItem;
if (m_model && current >= 0 && current < m_model->count()) {
m_currentItem = current;
} else {
m_currentItem = -1;
}
if (m_currentItem != previous) {
emit currentChanged(m_currentItem, previous);
}
}
int KItemListSelectionManager::currentItem() const
{
return m_currentItem;
}
void KItemListSelectionManager::setSelectedItems(const QSet<int>& items)
{
if (m_selectedItems != items) {
const QSet<int> previous = m_selectedItems;
m_selectedItems = items;
emit selectionChanged(m_selectedItems, previous);
}
}
QSet<int> KItemListSelectionManager::selectedItems() const
{
return m_selectedItems;
}
bool KItemListSelectionManager::hasSelection() const
{
return !m_selectedItems.isEmpty();
}
void KItemListSelectionManager::setSelected(int index, int count, SelectionMode mode)
{
if (index < 0 || count < 1 || !m_model || index >= m_model->count()) {
return;
}
const QSet<int> previous = m_selectedItems;
count = qMin(count, m_model->count() - index);
const int endIndex = index + count -1;
switch (mode) {
case Select:
for (int i = index; i <= endIndex; ++i) {
m_selectedItems.insert(i);
}
break;
case Deselect:
for (int i = index; i <= endIndex; ++i) {
m_selectedItems.remove(i);
}
break;
case Toggle:
for (int i = index; i <= endIndex; ++i) {
if (m_selectedItems.contains(i)) {
m_selectedItems.remove(i);
} else {
m_selectedItems.insert(i);
}
}
break;
default:
Q_ASSERT(false);
break;
}
if (m_selectedItems != previous) {
emit selectionChanged(m_selectedItems, previous);
}
}
void KItemListSelectionManager::clearSelection()
{
if (!m_selectedItems.isEmpty()) {
const QSet<int> previous = m_selectedItems;
m_selectedItems.clear();
emit selectionChanged(m_selectedItems, previous);
}
}
void KItemListSelectionManager::beginAnchoredSelection(int anchor, SelectionMode mode)
{
Q_UNUSED(anchor);
Q_UNUSED(mode);
}
void KItemListSelectionManager::endAnchoredSelection()
{
}
void KItemListSelectionManager::setAnchorItem(int anchor)
{
const int previous = m_anchorItem;
if (m_model && anchor < m_model->count()) {
m_anchorItem = anchor;
} else {
m_anchorItem = -1;
}
if (m_anchorItem != previous) {
emit anchorChanged(m_anchorItem, previous);
}
}
int KItemListSelectionManager::anchorItem() const
{
return m_anchorItem;
}
KItemModelBase* KItemListSelectionManager::model() const
{
return m_model;
}
void KItemListSelectionManager::setModel(KItemModelBase* model)
{
m_model = model;
if (model && model->count() > 0) {
m_currentItem = 0;
}
}
void KItemListSelectionManager::itemsInserted(const KItemRangeList& itemRanges)
{
// Update the current item
if (m_currentItem < 0) {
setCurrentItem(0);
} else {
int inc = 0;
foreach (const KItemRange& itemRange, itemRanges) {
if (m_currentItem < itemRange.index) {
break;
}
inc += itemRange.count;
}
setCurrentItem(m_currentItem + inc);
}
// Update the selections
if (!m_selectedItems.isEmpty()) {
const QSet<int> previous = m_selectedItems;
QSet<int> current;
current.reserve(m_selectedItems.count());
QSetIterator<int> it(m_selectedItems);
while (it.hasNext()) {
const int index = it.next();
int inc = 0;
foreach (const KItemRange& itemRange, itemRanges) {
if (index < itemRange.index) {
break;
}
inc += itemRange.count;
}
current.insert(index + inc);
}
if (current != previous) {
m_selectedItems = current;
emit selectionChanged(current, previous);
}
}
}
void KItemListSelectionManager::itemsRemoved(const KItemRangeList& itemRanges)
{
// Update the current item
if (m_currentItem >= 0) {
int currentItem = m_currentItem;
foreach (const KItemRange& itemRange, itemRanges) {
if (currentItem < itemRange.index) {
break;
}
if (currentItem >= itemRange.index + itemRange.count) {
currentItem -= itemRange.count;
} else if (currentItem >= m_model->count()) {
currentItem = m_model->count() - 1;
}
}
setCurrentItem(currentItem);
}
// Update the selections
if (!m_selectedItems.isEmpty()) {
const QSet<int> previous = m_selectedItems;
QSet<int> current;
current.reserve(m_selectedItems.count());
QSetIterator<int> it(m_selectedItems);
while (it.hasNext()) {
int index = it.next();
int dec = 0;
foreach (const KItemRange& itemRange, itemRanges) {
if (index < itemRange.index) {
break;
}
if (index < itemRange.index + itemRange.count) {
// The selection is part of the removed range
// and will get deleted
index = -1;
break;
}
dec += itemRange.count;
}
index -= dec;
if (index >= 0) {
current.insert(index);
}
}
if (current != previous) {
m_selectedItems = current;
emit selectionChanged(current, previous);
}
}
}
#include "kitemlistselectionmanager.moc"
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