MyDocument.m

/*
     File: MyDocument.m
 Abstract: Document object to manage a collection of text snippets; the snippets may be displayed in one or two windows:
 * A window managed by a DisplayController window controller which is solely for display purposes;
 * Optionally, a window managed by an EditController window controller, which is used for editing the snippets. 
 
  Version: 1.1
 
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 */

#import "MyDocument.h"
#import "DisplayController.h"
#import "EditController.h"
#import "Step.h"


@implementation MyDocument


@synthesize displayController;

#pragma mark -
#pragma mark Services methods

/*
 Service items apply to the display controller.
 */
-(NSString *)textForCurrentSelectionAndAdvance {
    return [displayController textForCurrentSelectionAndAdvance];
}

- (void)rewind {
    [displayController rewind];
}

- (void)moveUpOneLine {
    [displayController moveUpOneLine];
}

- (void)moveDownOneLine {
    [displayController moveDownOneLine];
}

- (void)createNewStep:(NSPasteboard *)pboard userData:(NSString *)data error:(NSString **)error {
    
    NSArray *newSteps = [pboard readObjectsForClasses:[NSArray arrayWithObject:[Step class]] options:[NSDictionary dictionary]];
    
    if ([newSteps count] != 1) {
        *error = NSLocalizedString(@"Couldn't create a step", @"Service error message");
        return;
    }
    
    Step *newStep = [newSteps objectAtIndex:0];    
    NSUInteger currentStepCount = [self countOfSteps];    
    newStep.tableSummary = [NSString stringWithFormat:@"Step %d", currentStepCount];
    newStep.undoManager = [self undoManager];
    
    [self insertObject:newStep inStepsAtIndex:currentStepCount];    
    [self editSteps:nil];
}


#pragma mark -
#pragma mark Reading and writing file

- (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError **)outError {

    NSArray *newSteps = [NSKeyedUnarchiver unarchiveObjectWithData:data];
    self.steps = newSteps;
    return YES;
}


- (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError {
    return [NSKeyedArchiver archivedDataWithRootObject:steps];
}


#pragma mark -
#pragma mark Managing window controllers

- (void)makeWindowControllers {
    
    // Create the display controller and keep a reference to it.
    DisplayController *aDisplayController = [[DisplayController alloc] initWithWindowNibName:@"Display"];
    [aDisplayController setShouldCloseDocument:YES];
    [aDisplayController showWindow:self];
    [self addWindowController:aDisplayController];
    self.displayController = aDisplayController;
    [aDisplayController release];
}


- (EditController *)editController {
    /*
     If an edit controller exists, it's the second object in window controllers array.  If there's only one item in the array, create a new edit controller.
     */
    EditController *editController = nil;
    NSArray *myWindowControllers = [self windowControllers];
    
    if ([myWindowControllers count] == 1) {
        editController = [[EditController alloc] initWithWindowNibName:@"Edit"];
        [self addWindowController:editController];
        [editController release];
        // Position the edit window atop the display window.
        NSRect frame = [[displayController window] frame];
        NSPoint topLeft = frame.origin;
        topLeft.y += [[[displayController window] contentView] frame].size.height;
        [[editController window] setFrameTopLeftPoint:topLeft];
    }
    else {
        editController = [myWindowControllers objectAtIndex:1];
    }
    
    return editController;
}    



- (IBAction)editSteps:sender {
    [self.editController showWindow:self];
}


#pragma mark -
#pragma mark Steps accessors

- (NSUInteger)countOfSteps {
    return [steps count];
}

- (id)objectInStepsAtIndex:(NSUInteger)idx {
    return [steps objectAtIndex:idx];
}

- (void)insertObject:(id)anObject inStepsAtIndex:(NSUInteger)idx {
    [[[self undoManager] prepareWithInvocationTarget:self] removeObjectFromStepsAtIndex:idx];        
    [steps insertObject:anObject atIndex:idx];
}

- (void)removeObjectFromStepsAtIndex:(NSUInteger)idx {
    
    id anObject = [self objectInStepsAtIndex:idx];
    [[[self undoManager] prepareWithInvocationTarget:self] insertObject:anObject inStepsAtIndex:idx];    
    [steps removeObjectAtIndex:idx];
}

- (void)replaceObjectInStepsAtIndex:(unsigned int)idx withObject:(id)anObject {
    
    id oldObject = [self objectInStepsAtIndex:idx];
    [[[self undoManager] prepareWithInvocationTarget:self] replaceObjectInStepsAtIndex:idx withObject:oldObject];
    [steps replaceObjectAtIndex:idx withObject:anObject];
}

- (NSArray *)steps {
    return steps;
}

- (void)setSteps:(NSArray *)aSteps {
    if (steps != aSteps) {
        [steps release];
        steps = [aSteps mutableCopy];
    }
}


#pragma mark -
#pragma mark Object lifecycle

- init {
    if (self = [super init]) {
        steps = [[NSMutableArray alloc] init];
    }
    return self;    
}



- (void)dealloc {
    [steps release];
    [super dealloc];
}


@end