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Added support for tableView:targetIndexPathForMoveFromRowAtIndexPath:toProposedIndexPath: #7

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Added support for tableView:targetIndexPathForMoveFromRowAtIndexPath:toProposedIndexPath: #7

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69 changes: 39 additions & 30 deletions ATSDragToReorderTableViewController.m
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Original file line number Diff line number Diff line change
Expand Up @@ -1108,37 +1108,46 @@ - (void)shuffleCellsOutOfWayOfDraggedCellIfNeeded {
}
}

if (rowToMoveTo != nil)
{
// Check with the delegate to ensure that this destination row is valid, and get another one if necessary.

if ([self.tableView.delegate respondsToSelector:@selector(tableView:targetIndexPathForMoveFromRowAtIndexPath:toProposedIndexPath:)]) {
rowToMoveTo = [self.tableView.delegate tableView:self.tableView targetIndexPathForMoveFromRowAtIndexPath:self.indexPathBelowDraggedCell toProposedIndexPath:rowToMoveTo];
}


/*
If the dragged cell is covering a new row that isn't the one with the blank item, move the blank item to that new row.
*/
if (rowToMoveTo != nil && !(rowToMoveTo.section == self.indexPathBelowDraggedCell.section && rowToMoveTo.row == self.indexPathBelowDraggedCell.row)) {
/*
Tableview's dataSource must update before we ask the tableview to update rows.
*/
[self.tableView.dataSource tableView:self.tableView moveRowAtIndexPath:self.indexPathBelowDraggedCell toIndexPath:rowToMoveTo];

/*
Update the blank index path
*/
NSIndexPath *formerBlankIndexPath = [[self.indexPathBelowDraggedCell retain] autorelease];
self.indexPathBelowDraggedCell = rowToMoveTo;

/*
Then animate the row updates.
*/
[self.tableView beginUpdates];
[self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:formerBlankIndexPath] withRowAnimation:UITableViewRowAnimationNone];
[self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:self.indexPathBelowDraggedCell] withRowAnimation:UITableViewRowAnimationNone];
[self.tableView endUpdates];

/*
Keep the cell under the dragged cell hidden.
This is a crucial line of code. Otherwise we get all kinds of graphical weirdness
*/
UITableViewCell *cellToHide = [self.tableView cellForRowAtIndexPath:self.indexPathBelowDraggedCell];
cellToHide.hidden = YES;

/*
If the dragged cell is covering a new row that isn't the one with the blank item, move the blank item to that new row.
*/
if (!(rowToMoveTo.section == self.indexPathBelowDraggedCell.section && rowToMoveTo.row == self.indexPathBelowDraggedCell.row)) {
/*
Tableview's dataSource must update before we ask the tableview to update rows.
*/
[self.tableView.dataSource tableView:self.tableView moveRowAtIndexPath:self.indexPathBelowDraggedCell toIndexPath:rowToMoveTo];

/*
Update the blank index path
*/
NSIndexPath *formerBlankIndexPath = [[self.indexPathBelowDraggedCell retain] autorelease];
self.indexPathBelowDraggedCell = rowToMoveTo;

/*
Then animate the row updates.
*/
[self.tableView beginUpdates];
[self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:formerBlankIndexPath] withRowAnimation:UITableViewRowAnimationNone];
[self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:self.indexPathBelowDraggedCell] withRowAnimation:UITableViewRowAnimationNone];
[self.tableView endUpdates];

/*
Keep the cell under the dragged cell hidden.
This is a crucial line of code. Otherwise we get all kinds of graphical weirdness
*/
UITableViewCell *cellToHide = [self.tableView cellForRowAtIndexPath:self.indexPathBelowDraggedCell];
cellToHide.hidden = YES;
}

}
}

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