/*

     File: TableViewVariableRowHeightsAppDelegate.m 

 Abstract: The sample's application delegate used to manage its primary window and table view. 

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 */

#import "TableViewVariableRowHeightsAppDelegate.h"

#define WRAPPER_COLUMN_ID @"Wrapper"

@implementation TableViewVariableRowHeightsAppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {

    // Store off the initial table column width. We use this as a constant for calculating the height of a given row.

    _tableColumnWidth = [[_tableView tableColumnWithIdentifier:WRAPPER_COLUMN_ID] width];

    _tableViewContents = [NSMutableArray new];

    // Add some short and long strings that we want to wrap

    [_tableViewContents addObject:@"Hello world!\nHello World line two!"];

    [_tableViewContents addObject:@"Let's add some sample text that can wrap and truncate.."];

    [_tableViewContents addObject:@"I think it is time to go outside and ride the unicycle around town for a bit. Maybe down Lombard Street? I bet we could go faster than the cars."];

    [_tableViewContents addObject:@"Well, it turns out going 25 mph down Lombard Street wasn't such a good idea."];

    [_tableViewContents addObject:@"At least I'm still here to give tips and tricks!"];

    [_tableViewContents addObject:@"A few tips, a few tricks, a little bit of Cocoa, and a little bit of caffeine."];

    [_tableView reloadData];

}

#pragma mark - NSTableView delegate/datasource methods

- (NSInteger)numberOfRowsInTableView:(NSTableView *)tableView {

    return [_tableViewContents count];

}

- (id)tableView:(NSTableView *)tableView objectValueForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row {

    // Return the same value for any table column -- it is just a string

    return [_tableViewContents objectAtIndex:row];

}

- (void)tableViewColumnDidResize:(NSNotification *)notification {

    _tableColumnWidth = [[_tableView tableColumnWithIdentifier:WRAPPER_COLUMN_ID] width];

    // Tell the table that we will have changed the row heights

    [_tableView noteHeightOfRowsWithIndexesChanged:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, _tableView.numberOfRows)]];    

}

- (CGFloat)tableView:(NSTableView *)tableView heightOfRow:(NSInteger)row {

    // It is important to use a constant value when calculating the height. Querying the tableColumn width will not work, since it dynamically changes as the user resizes -- however, we don't get a notification that the user "did resize" it until after the mouse is let go. We use the latter as a hook for telling the table that the heights changed. We must return the same height from this method every time, until we tell the table the heights have changed. Not doing so will quicly cause drawing problems.

    NSTableColumn *tableColumnToWrap = [_tableView tableColumnWithIdentifier:WRAPPER_COLUMN_ID];

    NSInteger columnToWrap = [_tableView.tableColumns indexOfObject:tableColumnToWrap];

    // Grab the fully prepared cell with our content filled in. Note that in IB the cell's Layout is set to Wraps.

    NSCell *cell = [tableView preparedCellAtColumn:columnToWrap row:row];

    // See how tall it naturally would want to be if given a restricted with, but unbound height

    NSRect constrainedBounds = NSMakeRect(0, 0, _tableColumnWidth, CGFLOAT_MAX);

    NSSize naturalSize = [cell cellSizeForBounds:constrainedBounds];

    // Make sure we have a minimum height -- use the table's set height as the minimum.

    if (naturalSize.height > [_tableView rowHeight]) {

        return naturalSize.height;

    } else {

        return [_tableView rowHeight];

    }

}

- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender {

    return YES;

}

@end