bundesmessenger-ios/Vector/ViewController/HomeViewController.m

/*
 Copyright 2015 OpenMarket Ltd

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */

#import "HomeViewController.h"

#import "RecentsDataSource.h"
#import "RecentsViewController.h"

#import "RoomViewController.h"

@interface HomeViewController ()
{
    // The search bar
    UISearchBar *searchBar;

    RecentsViewController *recentsViewController;
    RecentsDataSource *recentsDataSource;

    // Selected room description
    NSString  *selectedRoomId;
    MXSession *selectedRoomSession;

    // Keep reference on the current room view controller to release it correctly
    RoomViewController *currentRoomViewController;

    // Display a gradient view above the screen
    CAGradientLayer* tableViewMaskLayer;

    // Display a button to a new room
    UIImageView* createNewRoomImageView;

    // Backup of view when displaying search
    UIView *backupTitleView;
    UIBarButtonItem *backupLeftBarButtonItem;
    UIBarButtonItem *backupRightBarButtonItem;
}

@end

@implementation HomeViewController

- (void)displayWithSession:(MXSession *)session
{
    // to display a red navbar when the home server cannot be reached.
    [self addMatrixSession:session];
}


#pragma mark -

- (void)selectRoomWithId:(NSString*)roomId inMatrixSession:(MXSession*)matrixSession
{
    if (selectedRoomId && [selectedRoomId isEqualToString:roomId]
        && selectedRoomSession && selectedRoomSession == matrixSession)
    {
        // Nothing to do
        return;
    }

    selectedRoomId = roomId;
    selectedRoomSession = matrixSession;

    if (roomId && matrixSession)
    {
        [self performSegueWithIdentifier:@"showDetails" sender:self];
    }
    else
    {
        [self closeSelectedRoom];
    }
}

- (void)closeSelectedRoom
{
    selectedRoomId = nil;
    selectedRoomSession = nil;

    if (currentRoomViewController)
    {
        if (currentRoomViewController.roomDataSource)
        {
            // Let the manager release this room data source
            MXSession *mxSession = currentRoomViewController.roomDataSource.mxSession;
            MXKRoomDataSourceManager *roomDataSourceManager = [MXKRoomDataSourceManager sharedManagerForMatrixSession:mxSession];
            [roomDataSourceManager closeRoomDataSource:currentRoomViewController.roomDataSource forceClose:NO];
        }

        [currentRoomViewController destroy];
        currentRoomViewController = nil;
    }
}

- (void)viewDidLoad
{
    // Set up the SegmentedVC tabs before calling [super viewDidLoad]
    MXSession *session = self.mxSessions[0];

    NSMutableArray* viewControllers = [[NSMutableArray alloc] init];
    NSMutableArray* titles = [[NSMutableArray alloc] init];

    [titles addObject: NSLocalizedStringFromTable(@"Rooms", @"Vector", nil)];
    recentsViewController = [RecentsViewController recentListViewController];
    recentsDataSource = [[RecentsDataSource alloc] initWithMatrixSession:session];
    [recentsViewController displayList:recentsDataSource];
    recentsViewController.delegate = self;
    [viewControllers addObject:recentsViewController];

    [titles addObject: NSLocalizedStringFromTable(@"Messages", @"Vector", nil)];
    MXKViewController *tempMessagesVC = [[MXKViewController alloc] init];
    [viewControllers addObject:tempMessagesVC];

    [titles addObject: NSLocalizedStringFromTable(@"People", @"Vector", nil)];
    MXKViewController *tempPeopleVC = [[MXKViewController alloc] init];
    [viewControllers addObject:tempPeopleVC];

    [self initWithTitles:titles viewControllers:viewControllers defaultSelected:0];

    [super viewDidLoad];

    self.navigationItem.title = NSLocalizedStringFromTable(@"recents", @"Vector", nil);
    
    self.backgroundImageView.image = [UIImage imageNamed:@"search_bg"];

    // Search bar
    searchBar = [[UISearchBar alloc] init];
    searchBar.showsCancelButton = YES;
    searchBar.delegate = self;
}

- (void)dealloc
{
    [self closeSelectedRoom];
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    // Let's child display the loading not the home view controller
    if (self.activityIndicator)
    {
        [self.activityIndicator stopAnimating];
        self.activityIndicator = nil;
    }

    // Add blur mask programatically
    if (!tableViewMaskLayer)
    {
        tableViewMaskLayer = [CAGradientLayer layer];

        CGColorRef opaqueWhiteColor = [UIColor colorWithWhite:1.0 alpha:1.0].CGColor;
        CGColorRef transparentWhiteColor = [UIColor colorWithWhite:1.0 alpha:0].CGColor;

        tableViewMaskLayer.colors = [NSArray arrayWithObjects:(__bridge id)transparentWhiteColor, (__bridge id)transparentWhiteColor, (__bridge id)opaqueWhiteColor, nil];

        // display a gradient to the rencents bottom (20% of the bottom of the screen)
        tableViewMaskLayer.locations = [NSArray arrayWithObjects:
                                        [NSNumber numberWithFloat:0],
                                        [NSNumber numberWithFloat:0.8],
                                        [NSNumber numberWithFloat:1.0], nil];

        tableViewMaskLayer.bounds = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
        tableViewMaskLayer.anchorPoint = CGPointZero;

        // CAConstraint is not supported on IOS.
        // it seems only being supported on Mac OS.
        // so viewDidLayoutSubviews will refresh the layout bounds.
        [self.view.layer addSublayer:tableViewMaskLayer];
    }

    // Add new room button programatically
    if (!createNewRoomImageView)
    {
        createNewRoomImageView = [[UIImageView alloc] init];
        [createNewRoomImageView setTranslatesAutoresizingMaskIntoConstraints:NO];
        [self.view addSubview:createNewRoomImageView];

        createNewRoomImageView.backgroundColor = [UIColor clearColor];
        createNewRoomImageView.image = [UIImage imageNamed:@"create_room"];

        CGFloat side = 50.0f;
        NSLayoutConstraint* widthConstraint = [NSLayoutConstraint constraintWithItem:createNewRoomImageView
                                                                           attribute:NSLayoutAttributeWidth
                                                                           relatedBy:NSLayoutRelationEqual
                                                                              toItem:nil
                                                                           attribute:NSLayoutAttributeNotAnAttribute
                                                                          multiplier:1
                                                                            constant:side];

        NSLayoutConstraint* heightConstraint = [NSLayoutConstraint constraintWithItem:createNewRoomImageView
                                                                            attribute:NSLayoutAttributeHeight
                                                                            relatedBy:NSLayoutRelationEqual
                                                                               toItem:nil
                                                                            attribute:NSLayoutAttributeNotAnAttribute
                                                                           multiplier:1
                                                                             constant:side];

        NSLayoutConstraint* centerXConstraint = [NSLayoutConstraint constraintWithItem:createNewRoomImageView
                                                                             attribute:NSLayoutAttributeCenterX
                                                                             relatedBy:NSLayoutRelationEqual
                                                                                toItem:self.view
                                                                             attribute:NSLayoutAttributeCenterX
                                                                            multiplier:1
                                                                              constant:0];

        NSLayoutConstraint* bottomConstraint = [NSLayoutConstraint constraintWithItem:self.view
                                                                            attribute:NSLayoutAttributeBottom
                                                                            relatedBy:NSLayoutRelationEqual
                                                                               toItem:createNewRoomImageView
                                                                            attribute:NSLayoutAttributeBottom
                                                                           multiplier:1
                                                                             constant:50];

        if ([NSLayoutConstraint respondsToSelector:@selector(activateConstraints:)])
        {
            [NSLayoutConstraint activateConstraints:@[widthConstraint, heightConstraint, centerXConstraint, bottomConstraint]];
        }
        else
        {
            [createNewRoomImageView addConstraint:widthConstraint];
            [createNewRoomImageView addConstraint:heightConstraint];

            [self.view addConstraint:bottomConstraint];
            [self.view addConstraint:centerXConstraint];
        }

        createNewRoomImageView.userInteractionEnabled = YES;

        // tap -> switch to text edition
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onNewRoomPressed)];
        [tap setNumberOfTouchesRequired:1];
        [tap setNumberOfTapsRequired:1];
        [tap setDelegate:self];
        [createNewRoomImageView addGestureRecognizer:tap];
    }

    // TODO: a dedicated segmented viewWillAppear may be more appropriate
    [self.displayedViewController viewWillAppear:animated];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];

    // Release the current selected room (if any) except if the Room ViewController is still visible (see splitViewController.isCollapsed condition)
    // Note: 'isCollapsed' property is available in UISplitViewController for iOS 8 and later.
    if (!self.splitViewController || ([self.splitViewController respondsToSelector:@selector(isCollapsed)] && self.splitViewController.isCollapsed))
    {
        // Release the current selected room (if any).
        [self closeSelectedRoom];
    }
    else
    {
        // In case of split view controller where the primary and secondary view controllers are displayed side-by-side onscreen,
        // the selected room (if any) is highlighted.
        [self refreshCurrentSelectedCell:YES];
    }
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];

    selectedRoomId = nil;
    selectedRoomSession = nil;
}

- (void) viewDidLayoutSubviews
{
    [super viewDidLayoutSubviews];

    // sanity check
    if (tableViewMaskLayer)
    {
        CGRect currentBounds = tableViewMaskLayer.bounds;
        CGRect newBounds = CGRectIntegral(self.view.frame);

        // check if there is an update
        if (!CGSizeEqualToSize(currentBounds.size, newBounds.size))
        {
            newBounds.origin = CGPointZero;
            tableViewMaskLayer.bounds = newBounds;
        }
    }
}


 #pragma mark - Navigation

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Keep ref on destinationViewController
    [super prepareForSegue:segue sender:sender];

    if ([[segue identifier] isEqualToString:@"showDetails"])
    {
        UIViewController *controller;
        if ([[segue destinationViewController] isKindOfClass:[UINavigationController class]])
        {
            controller = [[segue destinationViewController] topViewController];
        }
        else
        {
            controller = [segue destinationViewController];
        }

        if ([controller isKindOfClass:[RoomViewController class]])
        {
            // Release existing Room view controller (if any)
            if (currentRoomViewController)
            {
                if (currentRoomViewController.roomDataSource)
                {
                    // Let the manager release this room data source
                    MXSession *mxSession = currentRoomViewController.roomDataSource.mxSession;
                    MXKRoomDataSourceManager *roomDataSourceManager = [MXKRoomDataSourceManager sharedManagerForMatrixSession:mxSession];
                    [roomDataSourceManager closeRoomDataSource:currentRoomViewController.roomDataSource forceClose:NO];
                }

                [currentRoomViewController destroy];
                currentRoomViewController = nil;
            }

            currentRoomViewController = (RoomViewController *)controller;

            MXKRoomDataSourceManager *roomDataSourceManager = [MXKRoomDataSourceManager sharedManagerForMatrixSession:selectedRoomSession];
            MXKRoomDataSource *roomDataSource = [roomDataSourceManager roomDataSourceForRoom:selectedRoomId create:YES];
            [currentRoomViewController displayRoom:roomDataSource];
        }

        if (self.splitViewController)
        {
            // Refresh selected cell without scrolling the selected cell (We suppose it's visible here)
            [self refreshCurrentSelectedCell:NO];

            // IOS >= 8
            if ([self.splitViewController respondsToSelector:@selector(displayModeButtonItem)])
            {
                controller.navigationItem.leftBarButtonItem = self.splitViewController.displayModeButtonItem;
            }

            //
            controller.navigationItem.leftItemsSupplementBackButton = YES;
        }
    }

    // Hide back button title
    self.navigationItem.backBarButtonItem =[[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];
}

#pragma mark - Internal methods


- (void)refreshCurrentSelectedCell:(BOOL)forceVisible
{
    // Update here the index of the current selected cell (if any) - Useful in landscape mode with split view controller.
    // TODO currentSelectedCellIndexPath = nil;
    if (currentRoomViewController)
    {
        // Restore the current selected room id, it is erased when view controller disappeared (see viewWillDisappear).
        if (!selectedRoomId)
        {
            selectedRoomId = currentRoomViewController.roomDataSource.roomId;
            selectedRoomSession = currentRoomViewController.mainSession;
        }

        // Look for the rank of this selected room in displayed recents
         // TODO currentSelectedCellIndexPath = [self.dataSource cellIndexPathWithRoomId:selectedRoomId andMatrixSession:selectedRoomSession];
    }

//    if (currentSelectedCellIndexPath)
//    {
//        // Select the right row
//        [self.recentsTableView selectRowAtIndexPath:currentSelectedCellIndexPath animated:YES scrollPosition:UITableViewScrollPositionNone];
//
//        if (forceVisible)
//        {
//            // Scroll table view to make the selected row appear at second position
//            NSInteger topCellIndexPathRow = currentSelectedCellIndexPath.row ? currentSelectedCellIndexPath.row - 1: currentSelectedCellIndexPath.row;
//            NSIndexPath* indexPath = [NSIndexPath indexPathForRow:topCellIndexPathRow inSection:currentSelectedCellIndexPath.section];
//            [self.recentsTableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:NO];
//        }
//    }
//    else
//    {
//        NSIndexPath *indexPath = [self.recentsTableView indexPathForSelectedRow];
//        if (indexPath)
//        {
//            [self.recentsTableView deselectRowAtIndexPath:indexPath animated:NO];
//        }
//    }
}


#pragma mark - Search

- (void)showSearch:(BOOL)animated
{
    backupTitleView = self.navigationItem.titleView;
    backupLeftBarButtonItem = self.navigationItem.leftBarButtonItem;
    backupRightBarButtonItem = self.navigationItem.rightBarButtonItem;

    // Remove navigation buttons
    self.navigationItem.rightBarButtonItem = nil;
    self.navigationItem.leftBarButtonItem = nil;

    // Add the search bar and
    self.navigationItem.titleView = searchBar;
    [searchBar becomeFirstResponder];

    // Show the tabs header
    if (animated)
    {
        [self updateSearch];

        [UIView animateWithDuration:.3 delay:0 options:UIViewAnimationOptionBeginFromCurrentState | UIViewAnimationOptionCurveEaseIn
                         animations:^{

                             self.selectionContainerHeightConstraint.constant = 44;
                             [self.view layoutIfNeeded];
                         }
                         completion:^(BOOL finished){
                         }];
    }
    else
    {
        [self updateSearch];
        self.selectionContainerHeightConstraint.constant = 44;
        [self.view layoutIfNeeded];
    }
}

- (void)hideSearch:(BOOL)animated
{
    if (backupLeftBarButtonItem)
    {
        self.navigationItem.titleView = backupTitleView;
        self.navigationItem.leftBarButtonItem = backupLeftBarButtonItem;
        self.navigationItem.rightBarButtonItem = backupRightBarButtonItem;
    }

    // Hide the tabs header
    if (animated)
    {
        [UIView animateWithDuration:.3 delay:0 options:UIViewAnimationOptionBeginFromCurrentState | UIViewAnimationOptionCurveEaseIn
                         animations:^{

                             self.selectionContainerHeightConstraint.constant = 0;
                             [self.view layoutIfNeeded];
                         }
                         completion:nil];
    }
    else
    {
        self.selectionContainerHeightConstraint.constant = 0;
        [self.view layoutIfNeeded];
    }

    // Go back under the recents tab
    // TODO: Open the feature in SegmentedVC
    [recentsDataSource searchWithPatterns:nil];
    self.displayedViewController.view.hidden = NO;
}

// Update search results under the currently selected tab
- (void)updateSearch
{
    if (searchBar.text.length)
    {
        self.displayedViewController.view.hidden = NO;

        // Forward the search request to the data source
        if (self.displayedViewController == recentsViewController)
        {
            [recentsDataSource searchWithPatterns:@[searchBar.text]];
        }
    }
    else
    {
        // Nothing to search = Show nothing
        self.displayedViewController.view.hidden = YES;
    }
}

#pragma mark - UISearchBarDelegate

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
    if (self.displayedViewController == recentsViewController)
    {
        // As the search is local, it can be updated on each text change
        [self updateSearch];
    }
}

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar2
{
    // "Search" key has been pressed
    [searchBar resignFirstResponder];
}

- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar2
{
    [self hideSearch:YES];
}

#pragma mark - MXKRecentListViewControllerDelegate

- (void)recentListViewController:(MXKRecentListViewController *)recentListViewController didSelectRoom:(NSString *)roomId inMatrixSession:(MXSession *)matrixSession
{
    // Open the room
    [self selectRoomWithId:roomId inMatrixSession:matrixSession];
}

#pragma mark - Actions

- (IBAction)onButtonPressed:(id)sender
{
    if (sender == _searchBarButtonIem)
    {
        [self showSearch:YES];
    }
}

- (void)onNewRoomPressed
{
    [self performSegueWithIdentifier:@"presentRoomCreationStep1" sender:self];
}

@end