UICollectionViewDelegates.swift
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//
// UICollectionViewDelegates.swift
//
// Copyright (c) 2016-2017 JTAppleCalendar (https://github.com/patchthecode/JTAppleCalendar)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
extension JTAppleCalendarView: UICollectionViewDelegate, UICollectionViewDataSource {
/// Asks your data source object to provide a
/// supplementary view to display in the collection view.
public func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
guard
let validDate = monthInfoFromSection(indexPath.section),
let delegate = calendarDelegate else {
developerError(string: "Either date could not be generated or delegate was nil")
assert(false, "Date could not be generated for section. This is a bug. Contact the developer")
return UICollectionReusableView()
}
let headerView = delegate.calendar(self, headerViewForDateRange: validDate.range, at: indexPath)
if #available(iOS 9.0, *) {
headerView.transform.a = semanticContentAttribute == .forceRightToLeft ? -1 : 1
}
return headerView
}
public func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
if !pathsToReload.contains(indexPath) { return }
pathsToReload.remove(indexPath)
let cellState: CellState
if let validCachedCellState = selectedCellData[indexPath]?.cellState {
cellState = validCachedCellState
} else {
cellState = cellStateFromIndexPath(indexPath)
}
calendarDelegate!.calendar(self, willDisplay: cell as! JTAppleCell, forItemAt: cellState.date, cellState: cellState, indexPath: indexPath)
}
/// Asks your data source object for the cell that corresponds
/// to the specified item in the collection view.
public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
guard let delegate = calendarDelegate else {
print("Your delegate does not conform to JTAppleCalendarViewDelegate")
assert(false)
return UICollectionViewCell()
}
let cellState = cellStateFromIndexPath(indexPath)
let configuredCell = delegate.calendar(self, cellForItemAt: cellState.date, cellState: cellState, indexPath: indexPath)
pathsToReload.remove(indexPath)
if #available(iOS 9.0, *) {
configuredCell.transform.a = semanticContentAttribute == .forceRightToLeft ? -1 : 1
}
return configuredCell
}
/// Asks your data sourceobject for the number of sections in
/// the collection view. The number of sections in collectionView.
public func numberOfSections(in collectionView: UICollectionView) -> Int {
return monthMap.count
}
/// Asks your data source object for the number of items in the
/// specified section. The number of rows in section.
public func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if calendarViewLayout.cellCache.isEmpty {return 0}
guard let count = calendarViewLayout.cellCache[section]?.count else {
developerError(string: "cellCacheSection does not exist.")
return 0
}
return count
}
/// Asks the delegate if the specified item should be selected.
/// true if the item should be selected or false if it should not.
public func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool {
return handleShouldSelectionValueChange(collectionView, action: .shouldSelect, indexPath: indexPath, selectionType: .userInitiated)
}
/// Asks the delegate if the specified item should be deselected.
/// true if the item should be deselected or false if it should not.
public func collectionView(_ collectionView: UICollectionView, shouldDeselectItemAt indexPath: IndexPath) -> Bool {
return handleShouldSelectionValueChange(collectionView, action: .shouldDeselect, indexPath: indexPath, selectionType: .userInitiated)
}
/// Tells the delegate that the item at the specified index
/// path was selected. The collection view calls this method when the
/// user successfully selects an item in the collection view.
/// It does not call this method when you programmatically
/// set the selection.
public func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
handleSelectionValueChanged(collectionView, action: .didSelect, indexPath: indexPath, selectionType: .userInitiated)
}
/// Tells the delegate that the item at the specified path was deselected.
/// The collection view calls this method when the user successfully
/// deselects an item in the collection view.
/// It does not call this method when you programmatically deselect items.
public func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) {
handleSelectionValueChanged(collectionView, action: .didDeselect, indexPath: indexPath, selectionType: .userInitiated)
}
public func sizeOfDecorationView(indexPath: IndexPath) -> CGRect {
guard let size = calendarDelegate?.sizeOfDecorationView(indexPath: indexPath) else { return .zero }
return size
}
func handleSelectionValueChanged(_ collectionView: UICollectionView, action: SelectionAction, indexPath: IndexPath, selectionType: SelectionType, shouldTriggerSelectionDelegate: Bool = true) {
guard
let delegate = calendarDelegate,
let infoOfDate = dateOwnerInfoFromPath(indexPath) else {
return
}
// index paths to be reloaded should be index to the left and right of the selected index
var localPathsToReload = isRangeSelectionUsed ? validForwardAndBackwordSelectedIndexes(forIndexPath: indexPath) : []
let cell = collectionView.cellForItem(at: indexPath) as? JTAppleCell
if !shouldTriggerSelectionDelegate || cell == nil {
pathsToReload.insert(indexPath)
localPathsToReload.insert(indexPath)
}
let isSelected = action == .didSelect ? true : false
// If cell has a counterpart cell, then select it as well
let cellState = cellStateFromIndexPath(indexPath, withDateInfo: infoOfDate, cell: cell, isSelected: isSelected, selectionType: selectionType)
// Update model
let cleanupAction: (IndexPath, Date, DateOwner) -> IndexPath?
if action == .didSelect {
cleanupAction = selectCounterPartCellIndexPath
addCellToSelectedSet(indexPath, date: infoOfDate.date, cellState: cellState)
} else {
cleanupAction = deselectCounterPartCellIndexPath
deleteCellFromSelectedSetIfSelected(indexPath)
}
// check if the paths to reload (forward&backward indexes) also have counterpart dates
if !localPathsToReload.isEmpty {
let reloadPaths = localPathsToReload
for path in reloadPaths {
if let validCounterPath = selectedCellData[path]?.counterIndexPath {
localPathsToReload.insert(validCounterPath)
}
}
}
if let counterPartIndexPath = cleanupAction(indexPath, infoOfDate.date, cellState.dateBelongsTo) {
localPathsToReload.insert(counterPartIndexPath)
let counterPathsToReload = isRangeSelectionUsed ? validForwardAndBackwordSelectedIndexes(forIndexPath: counterPartIndexPath) : []
localPathsToReload.formUnion(counterPathsToReload)
}
if shouldTriggerSelectionDelegate {
if action == .didSelect {
delegate.calendar(self, didSelectDate: infoOfDate.date, cell: cell, cellState: cellState)
} else {
delegate.calendar(self, didDeselectDate: infoOfDate.date, cell: cell, cellState: cellState)
}
}
if !localPathsToReload.isEmpty {
batchReloadIndexPaths(Array(localPathsToReload))
}
}
func handleShouldSelectionValueChange(_ collectionView: UICollectionView, action: ShouldSelectionAction, indexPath: IndexPath, selectionType: SelectionType) -> Bool {
if let
delegate = calendarDelegate,
let infoOfDate = dateOwnerInfoFromPath(indexPath) {
let cell = collectionView.cellForItem(at: indexPath) as? JTAppleCell
let cellState = cellStateFromIndexPath(indexPath,
withDateInfo: infoOfDate,
selectionType: selectionType)
switch action {
case .shouldSelect:
return delegate.calendar(self, shouldSelectDate: infoOfDate.date, cell: cell, cellState: cellState)
case .shouldDeselect:
return delegate.calendar(self, shouldDeselectDate: infoOfDate.date, cell: cell, cellState: cellState)
}
}
return false
}
}