Entry

How do i get sort arrows in the header of my NSTableView?

May 16th, 2002 00:50
Ben Hines, http://cocoa.mamasam.com/COCOADEV/2001/11/2/18932.php

// per Chuck Pistula on Cocoadev list, this is the "right" way to find the sort image as of 10.1
// This uses internal stuff, so make sure you save a local copy of the sort images, in case the "_defaultTableHeaderSortImage" goes away in 10.2.
	if ([[NSTableView class] respondsToSelector: @selector(_defaultTableHeaderSortImage)]) 
	{ 
		upSortImage = [[[NSTableView class] performSelector:@selector(_defaultTableHeaderSortImage)] retain];
	} else {
		upSortImage = [[NSImage alloc] initWithContentsOfFile:[inBundle pathForResource:@"sort-up" ofType:@"tiff"]];
	}
	if ([[NSTableView class] respondsToSelector: @selector(_defaultTableHeaderReverseSortImage)]) 
	{
		downSortImage = [[[NSTableView class] performSelector:@selector(_defaultTableHeaderReverseSortImage)] retain];
	} else {
		downSortImage = [[NSImage alloc] initWithContentsOfFile:[inBundle pathForResource:@"sort-down" ofType:@"tiff"]];
	}
	Then you can sort your tableview like this:
	// -----------------------------------------------------------------------------
//
//	- (void) tableView:(NSTableView*) didClickTableColumn:(NSTableColumn *)\
//
//	Called when a table header cell is clicked.
//  (note this will apparently not be called if the table columns are not re-orderable)
- (void) tableView:(NSTableView*)tableView didClickTableColumn:(NSTableColumn *)tableColumn
{ 
	NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
	// check to see if this column was already the selected one and if so invert the sort function.   
	if ([currentSortedColumn_ isEqualToString:[tableColumn identifier]] == YES)
	{
		if(upSort) upSort = FALSE; else upSort = TRUE;
	}
	else
	{   // if there already was a sorted column, remove the indicator image from it.
		[tableView setIndicatorImage:nil inTableColumn:[oTable tableColumnWithIdentifier:currentSortedColumn_]];
		upSort = TRUE;
	}
	// set the highlight+indicator image in the newly selected column
	[tableView setHighlightedTableColumn:tableColumn];	
	if(upSort)
		[tableView setIndicatorImage:upSortImage inTableColumn:tableColumn];
	else
		[tableView setIndicatorImage:downSortImage inTableColumn:tableColumn];
	[currentSortedColumn_ setString:[[tableColumn identifier] retain]]; 
	[mResultArray sortUsingFunction:(int (*)(id, id, void *))(sortDictArray) context:self];
	[tableView reloadData];
	[defaults setObject:currentSortedColumn_ forKey:kResultsSortColumn];
	[defaults synchronize];	
}