Re: Attributed strings - and bounding rects
Re: Attributed strings - and bounding rects
- Subject: Re: Attributed strings - and bounding rects
- From: Peter Hudson <email@hidden>
- Date: Sat, 04 Mar 2017 10:20:47 +0000
Many thanks for this detailed help Jonathan.
I’ll work my way through it !
Peter
> On 4 Mar 2017, at 09:54, Jonathan Mitchell <email@hidden> wrote:
>
>> I’m still not out of the wood yet though.
>
>
> Sorry. I should have provided more details.
>
> What I do to support table cell view wrapping is this. However, I have to support back to 10.9 so it may be possible to use some of the newer auto NSTextField line wrapping stuff.
>
> 1. Create a nib containing a wrapping cell view and associate it with a column that we want to wrap the content of. View based tableviews use Auto Layout for interior layout but in IB it doesn’t generally add and constrains to the default table cell views. So make a BPWrappingTableCellView nib that contains an NSTextField configured to wrap and constrained to the width and height of the cell.
>
> columnCellNib = [[NSNib alloc] initWithNibNamed:@"BPWrappingTableCellView" bundle:nil];
> [self.tableView registerNib:columnCellNib forIdentifier:@"action”];
>
> 2. Now the height of a row in the tableview must equal the height of the tallest cell in the row. There is a NSTableViewDelegate call for this. IN this example I have only one column that I need to wrap. If you have more you will need to find out which column has the tallest content.
>
> - (CGFloat)tableView:(NSTableView *)tableView heightOfRow:(NSInteger)row
> {
> // calculate height of row based on height of cell view in variable height column
> id obj = self.arrayController.arrangedObjects[row];
> CGFloat height = [tableView bp_heightOfRowForString:obj.description variableHeightColumnIdentifier:@"action"];
> return height;
> }
>
> 3. Calculate height of cell using a worker cell. This is an NSTableView category method.
>
> #pragma mark -
> #pragma mark Row height support
>
> - (CGFloat)bp_heightOfRowForString:(NSString *)text variableHeightColumnIdentifier:(NSString *)identifier
> {
> /*
>
> Calculate height of row to accomodate wrapping text field in the description column.
> On 10.11 it might be possible to just use the fields Automatic setting.
>
> http://stackoverflow.com/questions/7504546/view-based-nstableview-with-rows-that-have-dynamic-heights
>
> */
> // we use a layout worker cell for height calcs.
> if (!self.layoutCellView) {
> self.layoutCellView = [self makeViewWithIdentifier:identifier owner:nil];
> }
>
> // reset size
> CGFloat width = [self tableColumnWithIdentifier:identifier].width;
> [self.layoutCellView setFrameSize:NSMakeSize(width, 10)];
>
> // set the cell text
> self.layoutCellView.textField.stringValue = text;
>
> // layout to calculate size
> self.layoutCellView.textField.preferredMaxLayoutWidth = width - self.layoutCellView.textField.frame.origin.x - 10;
> [self.layoutCellView layoutSubtreeIfNeeded];
> CGFloat height = self.layoutCellView.frame.size.height;
>
> if (height < 30) height = 30;
> if (height > 150) height = 150;
>
> return height;
> }
>
> 4. Deal with column resizing:
>
> - (void)tableViewColumnDidResize:(NSNotification *)aNotification
> {
> // notify table view of row height change if variable height column width changes
> NSTableColumn *tableColumn = aNotification.userInfo[@"NSTableColumn"];
> NSTableView *tableView = tableColumn.tableView;
> [tableView bp_columnDidResize:tableColumn variableHeightColumnIdentifiers:@[@"action"]];
> }
>
> Another NSTableView category method.
> - (void)bp_columnDidResize:(NSTableColumn *)tableColumn variableHeightColumnIdentifiers:(NSArray *)columnIds
> {
> /*
>
> Trigger row height recalculation when change table column width
>
> */
> if (self.numberOfRows > 0 && [columnIds containsObject:tableColumn.identifier]) {
> NSIndexSet *rowIndexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, self.numberOfRows)];
> [NSAnimationContext beginGrouping];
> [[NSAnimationContext currentContext] setDuration:0];
> [self noteHeightOfRowsWithIndexesChanged:rowIndexSet];
> [NSAnimationContext endGrouping];
> }
> }
>
> HTH
>
> J
>
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