/***************************************************************************
* Copyright (C) 2011 by Peter Penz <peter.penz19@gmail.com> *
+ * Copyright (C) 2011 by Frank Reininghaus <frank78ac@googlemail.com> *
* *
- * Based on the Itemviews NG project from Trolltech Labs: *
- * http://qt.gitorious.org/qt-labs/itemviews-ng *
+ * Based on the Itemviews NG project from Trolltech Labs *
* *
* 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 *
#include "kitemlistselectionmanager.h"
-#include "kitemmodelbase.h"
-
KItemListSelectionManager::KItemListSelectionManager(QObject* parent) :
QObject(parent),
m_currentItem(-1),
m_anchorItem(-1),
- m_model(0)
+ m_selectedItems(),
+ m_isAnchoredSelectionActive(false),
+ m_model(nullptr)
{
}
void KItemListSelectionManager::setCurrentItem(int current)
{
const int previous = m_currentItem;
- if (m_model && current < m_model->count()) {
+ 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);
+ }
+ }
}
}
return m_currentItem;
}
-void KItemListSelectionManager::setAnchorItem(int anchor)
+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)
{
- const int previous = m_anchorItem;
- if (m_model && anchor < m_model->count()) {
+ 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::replaceSelection(int index, int count)
+{
+ const KItemSet previous = selectedItems();
+ if (!previous.isEmpty()) {
+ m_selectedItems.clear();
+ m_isAnchoredSelectionActive = false;
+ }
+ setSelected(index, count);
+}
+
+void KItemListSelectionManager::beginAnchoredSelection(int anchor)
+{
+ if (anchor >= 0 && m_model && anchor < m_model->count()) {
+ m_isAnchoredSelectionActive = true;
m_anchorItem = anchor;
- } else {
- m_anchorItem = -1;
}
+}
+
+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);
- if (m_anchorItem != previous) {
- emit anchorChanged(m_anchorItem, previous);
+ for (int index = from; index <= to; ++index) {
+ m_selectedItems.insert(index);
+ }
}
+
+ m_isAnchoredSelectionActive = false;
}
-int KItemListSelectionManager::anchorItem() const
+bool KItemListSelectionManager::isAnchoredSelectionActive() const
{
- return m_anchorItem;
+ return m_isAnchoredSelectionActive;
}
KItemModelBase* KItemListSelectionManager::model() const
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<int>& movedToIndexes)
+{
+ // Store the current selection (needed in the selectionChanged() signal)
+ const KItemSet previousSelection = selectedItems();
+
+ // Store whether we were doing an anchored selection
+ const bool wasInAnchoredSelection = isAnchoredSelectionActive();
+
+ // 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.
+ if (wasInAnchoredSelection) {
+ 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);
}
-#include "kitemlistselectionmanager.moc"
projects / dolphin.git / blobdiff