/*

     File: DisplayController.m

 Abstract: A window controller to display the titles of the text snippets.

  Version: 1.1

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL

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 */

#import "AppDelegate.h"

#import "DisplayController.h"

#import "Step.h"

@implementation DisplayController

@synthesize arrayController, tableView;

#pragma mark -

#pragma mark Services methods

-(NSString *)textForCurrentSelectionAndAdvance {

    NSString *string = nil;

    NSUInteger selectedRow = [arrayController selectionIndex];

    if (selectedRow != NSNotFound) {

        Step *step = (Step *)[[arrayController arrangedObjects] objectAtIndex:selectedRow];

        string = step.body;

        if (string == nil) {

            string = @"";

        }

        [self moveDownOneLine];

    }

    else {

        string = @"";

    }

    return string;

}

- (void)rewind {

    [tableView selectRowIndexes:[NSIndexSet indexSetWithIndex:0] byExtendingSelection:NO];

    [tableView scrollRowToVisible:0];

}

- (void)moveUpOneLine {

    NSUInteger selectedRow = [arrayController selectionIndex];

    if ((selectedRow > 0) && (selectedRow != NSNotFound)) {

        [tableView selectRowIndexes:[NSIndexSet indexSetWithIndex:(selectedRow -1)] byExtendingSelection:NO];

        [tableView scrollRowToVisible:(selectedRow -1)];

    }

}

- (void)moveDownOneLine {

    NSUInteger selectedRow = [arrayController selectionIndex];

    if (selectedRow == NSNotFound) {

        return;

    }

    selectedRow++;

    if (selectedRow < [[arrayController arrangedObjects] count]) {

        [arrayController setSelectionIndex:selectedRow];    

        [tableView scrollRowToVisible:selectedRow];

    }

}

#pragma mark -

#pragma mark Table view delegate methods

- (NSString *)tableView:(NSTableView *)aTableView toolTipForCell:(NSCell *)aCell rect:(NSRectPointer)rect tableColumn:(NSTableColumn *)aTableColumn row:(NSInteger)row mouseLocation:(NSPoint)mouseLocation {

    // If user defaults allows tooltips, then return the step's tooltip.

    if ([[[[NSUserDefaultsController sharedUserDefaultsController]

        values] valueForKey:DMKDisplayToolTipsKey] boolValue]) {

        Step *step = (Step *)[[arrayController arrangedObjects] objectAtIndex:row];

        return step.tooltip;

    }

    return nil;

}

- (BOOL)tableView:(NSTableView *)aTableView shouldSelectRow:(NSInteger)rowIndex {

    // For convenience, automatically write the row to the pasteboard then make sure the next row is displayed, ready for the next selection.

    BOOL ok = [self writeRow:rowIndex toPasteboard:[NSPasteboard generalPasteboard]];

    if (ok && (rowIndex < [[arrayController arrangedObjects] count] -1)) {

        [self performSelector:@selector(scrollTableViewToRow:) withObject:[NSNumber numberWithInteger:(rowIndex+1)] afterDelay:0.1];

    }

    return ok;

}

- (BOOL)tableView:(NSTableView *)tv writeRowsWithIndexes:(NSIndexSet *)rowIndexes toPasteboard:(NSPasteboard*)pboard {

    // Don't write anything if more than one row is selected.

    if ([rowIndexes count] != 1) {

        return NO;

    }

    NSInteger row = [rowIndexes firstIndex];

    if (row < [[arrayController arrangedObjects] count] -1) {

        [self performSelector:@selector(scrollTableViewToRow:) withObject:[NSNumber numberWithInteger:(row+1)] afterDelay:0.1];

    }

    return [self writeRow:row toPasteboard:pboard];

}

#pragma mark -

#pragma mark Table view drag and drop

/*

 The display table view shouldn't support drag and drop or any reordering.

 */

- (NSDragOperation)tableView:(NSTableView*)tv validateDrop:(id <NSDraggingInfo>)info proposedRow:(NSInteger)row proposedDropOperation:(NSTableViewDropOperation)op {

    return NSDragOperationNone;

}

- (BOOL)tableView:(NSTableView*)tv acceptDrop:(id <NSDraggingInfo>)info row:(NSInteger)row dropOperation:(NSTableViewDropOperation)op {

    return NO;

}

#pragma mark -

#pragma mark Scroll to view

- (void)scrollTableViewToRow:(NSNumber *)row {

    [tableView scrollRowToVisible:[row integerValue]];    

}

#pragma mark -

#pragma mark Writing rows

- (BOOL)writeRow:(NSInteger)row toPasteboard:(NSPasteboard*)pboard {

    // For the display window, just write the selected step's body, not the complete step.

    Step *step = (Step *)[[arrayController arrangedObjects] objectAtIndex:row];

    NSString *stepBody = step.body;

    if (stepBody == nil) {

        return NO;

    }

    [pboard clearContents];

    [pboard writeObjects:[NSArray arrayWithObject:stepBody]];

    return YES;

}

#pragma mark -

#pragma mark Window transparency

/*

 Observe the shared user defaults controller for changes to the displayWindowAlpha preference.

 Update the window's alpha value in response.

 */

static const NSString *windowAlphaContext;

- (void)windowDidLoad {

    [super windowDidLoad];

    [tableView setDraggingSourceOperationMask:NSDragOperationCopy forLocal:NO];

    NSUserDefaultsController *udc = [NSUserDefaultsController sharedUserDefaultsController];

    NSString *displayWindowAlphaKeyPath = [@"values." stringByAppendingString:DMKDisplayWindowAlphaKey];

    [udc addObserver:self forKeyPath:displayWindowAlphaKeyPath options:0 context:&windowAlphaContext];

    [[self window] setAlphaValue:[[udc valueForKeyPath:displayWindowAlphaKeyPath] floatValue]];

}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {

    if (context != &windowAlphaContext) {

        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];

        return;

    }

    [[self window] setAlphaValue:[[object valueForKeyPath:[@"values." stringByAppendingString:DMKDisplayWindowAlphaKey]] floatValue]];

}

#pragma mark -

#pragma mark Object lifecycle

- (void) dealloc {

    NSUserDefaultsController *udc = [NSUserDefaultsController sharedUserDefaultsController];

    [udc removeObserver:self forKeyPath:[@"values." stringByAppendingString:DMKDisplayWindowAlphaKey]];

    [super dealloc];    

}

@end