diff --git a/src/kitemviews/kitemlistselectionmanager.cpp b/src/kitemviews/kitemlistselectionmanager.cpp index efc256e1e..f5e097c02 100644 --- a/src/kitemviews/kitemlistselectionmanager.cpp +++ b/src/kitemviews/kitemlistselectionmanager.cpp @@ -1,396 +1,399 @@ /*************************************************************************** * Copyright (C) 2011 by Peter Penz * * Copyright (C) 2011 by Frank Reininghaus * * * * 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" KItemListSelectionManager::KItemListSelectionManager(QObject* parent) : QObject(parent), m_currentItem(-1), m_anchorItem(-1), m_selectedItems(), m_isAnchoredSelectionActive(false), m_model(nullptr) { } KItemListSelectionManager::~KItemListSelectionManager() { } void KItemListSelectionManager::setCurrentItem(int current) { const int previous = m_currentItem; const KItemSet previousSelection = selectedItems(); 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); if (m_isAnchoredSelectionActive) { const KItemSet selection = selectedItems(); if (selection != previousSelection) { emit selectionChanged(selection, previousSelection); } } } } int KItemListSelectionManager::currentItem() const { return m_currentItem; } void KItemListSelectionManager::setSelectedItems(const KItemSet& items) { if (m_selectedItems != items) { const KItemSet previous = m_selectedItems; m_selectedItems = items; emit selectionChanged(m_selectedItems, previous); } } KItemSet KItemListSelectionManager::selectedItems() const { KItemSet selectedItems = m_selectedItems; if (m_isAnchoredSelectionActive && m_anchorItem != m_currentItem) { Q_ASSERT(m_anchorItem >= 0); Q_ASSERT(m_currentItem >= 0); const int from = qMin(m_anchorItem, m_currentItem); const int to = qMax(m_anchorItem, m_currentItem); for (int index = from; index <= to; ++index) { selectedItems.insert(index); } } return selectedItems; } bool KItemListSelectionManager::isSelected(int index) const { if (m_selectedItems.contains(index)) { return true; } if (m_isAnchoredSelectionActive && m_anchorItem != m_currentItem) { Q_ASSERT(m_anchorItem >= 0); Q_ASSERT(m_currentItem >= 0); const int from = qMin(m_anchorItem, m_currentItem); const int to = qMax(m_anchorItem, m_currentItem); if (from <= index && index <= to) { return true; } } return false; } bool KItemListSelectionManager::hasSelection() const { return !m_selectedItems.isEmpty() || (m_isAnchoredSelectionActive && m_anchorItem != m_currentItem); } void KItemListSelectionManager::setSelected(int index, int count, SelectionMode mode) { if (index < 0 || count < 1 || !m_model || index >= m_model->count()) { return; } endAnchoredSelection(); const KItemSet previous = 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; } const KItemSet selection = selectedItems(); if (selection != previous) { emit selectionChanged(selection, previous); } } void KItemListSelectionManager::clearSelection() { const KItemSet previous = selectedItems(); if (!previous.isEmpty()) { m_selectedItems.clear(); m_isAnchoredSelectionActive = false; emit selectionChanged(KItemSet(), previous); } } void KItemListSelectionManager::beginAnchoredSelection(int anchor) { if (anchor >= 0 && m_model && anchor < m_model->count()) { m_isAnchoredSelectionActive = true; m_anchorItem = anchor; } } void KItemListSelectionManager::endAnchoredSelection() { if (m_isAnchoredSelectionActive && (m_anchorItem != m_currentItem)) { Q_ASSERT(m_anchorItem >= 0); Q_ASSERT(m_currentItem >= 0); const int from = qMin(m_anchorItem, m_currentItem); const int to = qMax(m_anchorItem, m_currentItem); for (int index = from; index <= to; ++index) { m_selectedItems.insert(index); } } m_isAnchoredSelectionActive = false; } bool KItemListSelectionManager::isAnchoredSelectionActive() const { return m_isAnchoredSelectionActive; } 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) { // Store the current selection (needed in the selectionChanged() signal) const KItemSet previousSelection = selectedItems(); // Update the current item if (m_currentItem < 0) { setCurrentItem(0); } else { const int previousCurrent = m_currentItem; int inc = 0; foreach (const KItemRange& itemRange, itemRanges) { if (m_currentItem < itemRange.index) { break; } inc += itemRange.count; } // Calling setCurrentItem would trigger the selectionChanged signal, but we want to // emit it only once in this function -> change the current item manually and emit currentChanged m_currentItem += inc; + if (m_currentItem >= m_model->count()) { + m_currentItem = -1; + } emit currentChanged(m_currentItem, previousCurrent); } // Update the anchor item if (m_anchorItem < 0) { m_anchorItem = 0; } else { int inc = 0; foreach (const KItemRange& itemRange, itemRanges) { if (m_anchorItem < itemRange.index) { break; } inc += itemRange.count; } m_anchorItem += inc; } // Update the selections if (!m_selectedItems.isEmpty()) { const KItemSet previous = m_selectedItems; m_selectedItems.clear(); for (int index: previous) { int inc = 0; foreach (const KItemRange& itemRange, itemRanges) { if (index < itemRange.index) { break; } inc += itemRange.count; } m_selectedItems.insert(index + inc); } } const KItemSet selection = selectedItems(); if (selection != previousSelection) { emit selectionChanged(selection, previousSelection); } } void KItemListSelectionManager::itemsRemoved(const KItemRangeList& itemRanges) { // Store the current selection (needed in the selectionChanged() signal) const KItemSet previousSelection = selectedItems(); const int previousCurrent = m_currentItem; // Update the current item m_currentItem = indexAfterRangesRemoving(m_currentItem, itemRanges, DiscardRemovedIndex); if (m_currentItem != previousCurrent) { emit currentChanged(m_currentItem, previousCurrent); if (m_currentItem < 0) { // Calling setCurrentItem() would trigger the selectionChanged signal, but we want to // emit it only once in this function -> change the current item manually and emit currentChanged m_currentItem = indexAfterRangesRemoving(previousCurrent, itemRanges, AdjustRemovedIndex); emit currentChanged(m_currentItem, -1); } } // Update the anchor item if (m_anchorItem >= 0) { m_anchorItem = indexAfterRangesRemoving(m_anchorItem, itemRanges, DiscardRemovedIndex); if (m_anchorItem < 0) { m_isAnchoredSelectionActive = false; } } // Update the selections and the anchor item if (!m_selectedItems.isEmpty()) { const KItemSet previous = m_selectedItems; m_selectedItems.clear(); for (int oldIndex : previous) { const int index = indexAfterRangesRemoving(oldIndex, itemRanges, DiscardRemovedIndex); if (index >= 0) { m_selectedItems.insert(index); } } } const KItemSet selection = selectedItems(); if (selection != previousSelection) { emit selectionChanged(selection, previousSelection); } Q_ASSERT(m_currentItem < m_model->count()); Q_ASSERT(m_anchorItem < m_model->count()); } void KItemListSelectionManager::itemsMoved(const KItemRange& itemRange, const QList& movedToIndexes) { // Store the current selection (needed in the selectionChanged() signal) const KItemSet previousSelection = selectedItems(); // endAnchoredSelection() adds all items between m_currentItem and // m_anchorItem to m_selectedItems. They can then be moved // individually later in this function. endAnchoredSelection(); // Update the current item if (m_currentItem >= itemRange.index && m_currentItem < itemRange.index + itemRange.count) { const int previousCurrentItem = m_currentItem; const int newCurrentItem = movedToIndexes.at(previousCurrentItem - itemRange.index); // Calling setCurrentItem would trigger the selectionChanged signal, but we want to // emit it only once in this function -> change the current item manually and emit currentChanged m_currentItem = newCurrentItem; emit currentChanged(newCurrentItem, previousCurrentItem); } // Start a new anchored selection. beginAnchoredSelection(m_currentItem); // Update the selections if (!m_selectedItems.isEmpty()) { const KItemSet previous = m_selectedItems; m_selectedItems.clear(); for (int index : previous) { if (index >= itemRange.index && index < itemRange.index + itemRange.count) { m_selectedItems.insert(movedToIndexes.at(index - itemRange.index)); } else { m_selectedItems.insert(index); } } } const KItemSet selection = selectedItems(); if (selection != previousSelection) { emit selectionChanged(selection, previousSelection); } } int KItemListSelectionManager::indexAfterRangesRemoving(int index, const KItemRangeList& itemRanges, const RangesRemovingBehaviour behaviour) const { int dec = 0; foreach (const KItemRange& itemRange, itemRanges) { if (index < itemRange.index) { break; } dec += itemRange.count; const int firstIndexAfterRange = itemRange.index + itemRange.count; if (index < firstIndexAfterRange) { // The index is part of the removed range if (behaviour == DiscardRemovedIndex) { return -1; } else { // Use the first item after the range as new index index = firstIndexAfterRange; break; } } } return qBound(-1, index - dec, m_model->count() - 1); }