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Room details: fix related to back pagination

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giomfo
2014-10-16 17:04:30 +02:00
parent 3193d20dc9
commit 4a93cc1674
1 changed files with 66 additions and 52 deletions
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118
syMessaging/syMessaging/RoomViewController.m
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@@ -181,6 +181,71 @@
self.roomNavItem.title = mxRoomData.displayname;
}
- (void)scrollToBottomAnimated:(BOOL)animated {
// Scroll table view to the bottom
NSInteger rowNb = messages.count;
if (rowNb) {
[self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:(rowNb - 1) inSection:0] atScrollPosition:UITableViewScrollPositionBottom animated:animated];
}
}
- (void)triggerBackPagination {
if (mxRoomData.canPaginate)
{
[_activityIndicator startAnimating];
[mxRoomData paginateBackMessages:20 success:^(NSArray *oldMessages) {
if (oldMessages.count)
{
// Update table sources
NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, oldMessages.count)];
[messages insertObjects:oldMessages atIndexes:indexSet];
// Prepare insertion of new rows at the top of the table (compute cumulative height of added cells)
NSMutableArray *indexPaths = [NSMutableArray arrayWithCapacity:oldMessages.count];
CGFloat verticalOffset = 0;
for (NSUInteger index = 0; index < oldMessages.count; index++) {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:index inSection:0];
[indexPaths addObject:indexPath];
verticalOffset += [self tableView:self.tableView heightForRowAtIndexPath:indexPath];
}
// Disable animation during cells insertion to prevent flickering
[UIView setAnimationsEnabled:NO];
// Store the current content offset
CGPoint contentOffset = self.tableView.contentOffset;
[self.tableView beginUpdates];
[self.tableView insertRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationNone];
[self.tableView endUpdates];
// Enable animation again
[UIView setAnimationsEnabled:YES];
// Fix vertical offset in order to prevent scrolling down
contentOffset.y += verticalOffset;
[self.tableView setContentOffset:contentOffset animated:NO];
[_activityIndicator stopAnimating];
// Move the current message at the middle of the visible area (dispatch this action in order to let table end its refresh)
dispatch_async(dispatch_get_main_queue(), ^{
[self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:(oldMessages.count - 1) inSection:0] atScrollPosition:UITableViewScrollPositionMiddle animated:YES];
});
} else {
// Here there was no event related to the `messages` property
[_activityIndicator stopAnimating];
// Trigger a new back pagination (if any)
[self triggerBackPagination];
}
} failure:^(NSError *error) {
[_activityIndicator stopAnimating];
NSLog(@"Failed to paginate back: %@", error);
//Alert user
[[AppDelegate theDelegate] showErrorAsAlert:error];
}];
}
}
#pragma mark - keyboard handling
- (void)onKeyboardWillShow:(NSNotification *)notif {
NSValue *rectVal = notif.userInfo[UIKeyboardFrameEndUserInfoKey];
CGRect endRect = rectVal.CGRectValue;
@@ -210,14 +275,6 @@
[_messageTextField resignFirstResponder];
}
- (void)scrollToBottomAnimated:(BOOL)animated {
// Scroll table view to the bottom
NSInteger rowNb = messages.count;
if (rowNb) {
[self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:(rowNb - 1) inSection:0] atScrollPosition:UITableViewScrollPositionBottom animated:animated];
}
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
@@ -277,50 +334,7 @@
// paginate ?
if ((scrollView.contentOffset.y < -64) && (_activityIndicator.isAnimating == NO))
{
if (mxRoomData.canPaginate)
{
[_activityIndicator startAnimating];
[mxRoomData paginateBackMessages:20 success:^(NSArray *oldMessages) {
// Update table sources
NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, oldMessages.count)];
[messages insertObjects:oldMessages atIndexes:indexSet];
// Prepare insertion of new rows at the top of the table (compute cumulative height of added cells)
NSMutableArray *indexPaths = [NSMutableArray arrayWithCapacity:oldMessages.count];
CGFloat verticalOffset = 0;
for (NSUInteger index = 0; index < oldMessages.count; index++) {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:index inSection:0];
[indexPaths addObject:indexPath];
verticalOffset += [self tableView:self.tableView heightForRowAtIndexPath:indexPath];
}
// Disable animation during cells insertion to prevent flickering
[UIView setAnimationsEnabled:NO];
// Store the current content offset
CGPoint contentOffset = self.tableView.contentOffset;
[self.tableView beginUpdates];
[self.tableView insertRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationNone];
[self.tableView endUpdates];
// Enable animation again
[UIView setAnimationsEnabled:YES];
// Fix vertical offset in order to prevent scrolling down
contentOffset.y += verticalOffset;
[self.tableView setContentOffset:contentOffset animated:NO];
[_activityIndicator stopAnimating];
// Move the current message at the middle of the visible area (dispatch this action in order to let table end its refresh)
dispatch_async(dispatch_get_main_queue(), ^{
[self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:(oldMessages.count - 1) inSection:0] atScrollPosition:UITableViewScrollPositionMiddle animated:YES];
});
} failure:^(NSError *error) {
[_activityIndicator stopAnimating];
NSLog(@"Failed to paginate back: %@", error);
//Alert user
[[AppDelegate theDelegate] showErrorAsAlert:error];
}];
}
[self triggerBackPagination];
}
}
}