Folks;
iTunes and Excel both have a feature wherein if you double-click on
the column divider in the tableHeader then the table column width is
adjusted to the maximum width of the data in the column.
Below is a reasonably generic Cocoa solution for implementing this
behavior.
The tableView I developed this for uses an arrayController with
individual column bindings; not the old school -dataSource methods for
handling the data.
This code should exist in tableView's delegate.
This solution handles both strings and images.
I don't like the reliance on calling the arrayController directly but
for now it serves my purpose
I am interested in both criticisms and improvements - both will serve
the Cocoa community..
- (void)tableView:(NSTableView *)tableView
mouseDownInHeaderOfTableColumn:(NSTableColumn *)tableColumn {
NSEvent *event = [NSApp currentEvent];
if ([event clickCount]==2) {
NSPoint location = [event locationInWindow];
NSTableHeaderView *header = [tableView headerView];
location = [header convertPoint:location fromView:nil];
if (location.x>=2.0) location.x-=2; // offset point 2 pixels 'cause
the 'split' cursor is a little 'permissive'
NSTableColumn *thisColumn = [[tableView tableColumns] objectAtIndex:
[header columnAtPoint:location]];
NSString *maxStr = @"";
id thisObj;
NSCell *dCell;
float newWidth, maxStringWidth = 0.0 ,maxImageWidth = 0.0;
// me don't like the next line
NSArray *theValues = [[myArrayController arrangedObjects]
valueForKey:[thisColumn identifier]]; //dump the tableColumn values
to an array
if ((theValues!=nil) && ([theValues count]>0)) {
NSEnumerator *valEnum = [theValues objectEnumerator];
// find the longest string or widest image
while ((thisObj = [valEnum nextObject]) != nil) {
if ([thisObj isKindOfClass:[NSString class]]) {
if ([thisObj length] > [maxStr length]) maxStr = thisObj; //
keep the string 'cause later we use dataCell to get -width
} else if ([thisObj isKindOfClass:[NSImage
class]]) {
if ([thisObj size].width > maxImageWidth) maxImageWidth =
[thisObj size].width;
}
}
//below covers the case where a mix of strings and images were
found - chooses the wider of the two
if ([maxStr length]> 0) {
dCell = [thisColumn dataCell];
[dCell setStringValue:maxStr];
maxStringWidth = [dCell cellSize].width;
}
newWidth = (maxStringWidth > maxImageWidth) ? maxStringWidth :
maxImageWidth;
//this check prevents anything from happing unless we have found
something actionable
if (newWidth>0) {
//bump up max if necessary
if (newWidth>[thisColumn maxWidth]) [thisColumn
setMaxWidth:newWidth];
//set width to max if not already max
if ([thisColumn width] != newWidth) {
[thisColumn setWidth:newWidth];
} else {
//if already max then here double-click sets to half max! (maybe
NOT do this if images were found?)
[thisColumn setWidth:newWidth/2.0];
}
}
}
}
}
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