SKTGridPanelController.m

// SKTGridPanelController.m
// Sketch Example
//

#import "SKTGridPanelController.h"
#import "SKTGridView.h"
#import "SKTGraphicView.h"
#import "SKTDrawWindowController.h"

@implementation SKTGridPanelController

+ (id)sharedGridPanelController {
    static SKTGridPanelController *sharedGridPanelController = nil;

    if (!sharedGridPanelController) {
        sharedGridPanelController = [[SKTGridPanelController allocWithZone:NULL] init];
    }

    return sharedGridPanelController;
}

- (id)init {
    self = [self initWithWindowNibName:@"GridPanel"];
    if (self) {
        [self setWindowFrameAutosaveName:@"Grid"];
    }
    return self;
}

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    [super dealloc];
}

- (void)updatePanel {
    if ([self isWindowLoaded]) {
        BOOL hasGraphicView = ((_inspectingGraphicView == nil) ? NO : YES);
        [snapsToGridCheckbox setState:([self snapsToGrid] ? NSOnState : NSOffState)];
        [showsGridCheckbox setState:([self showsGrid] ? NSOnState : NSOffState)];
        [gridSpacingSlider setIntValue:[self gridSpacing]];
        [gridColorWell setColor:[self gridColor]];
        [snapsToGridCheckbox setEnabled:hasGraphicView];
        [showsGridCheckbox setEnabled:hasGraphicView];
        [gridSpacingSlider setEnabled:hasGraphicView];
        [gridColorWell setEnabled:hasGraphicView];
        [gridView setNeedsDisplay:YES];
    }
}

- (void)setMainWindow:(NSWindow *)mainWindow {
    NSWindowController *controller = [mainWindow windowController];

    if (controller && [controller isKindOfClass:[SKTDrawWindowController class]]) {
        _inspectingGraphicView = [(SKTDrawWindowController *)controller graphicView];
    } else {
        _inspectingGraphicView = nil;
    }
    [self updatePanel];
}

- (void)mainWindowChanged:(NSNotification *)notification {
    [self setMainWindow:[notification object]];
}

- (void)mainWindowResigned:(NSNotification *)notification {
    [self setMainWindow:nil];
}

- (void)windowDidLoad {
    [super windowDidLoad];
    [(NSPanel *)[self window] setFloatingPanel:YES];
    [(NSPanel *)[self window] setBecomesKeyOnlyIfNeeded:YES];
    [self setMainWindow:[NSApp mainWindow]];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(mainWindowChanged:) name:NSWindowDidBecomeMainNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(mainWindowResigned:) name:NSWindowDidResignMainNotification object:nil];
}

- (BOOL)snapsToGrid {
    return (_inspectingGraphicView ? [_inspectingGraphicView snapsToGrid] : NO);
}

- (BOOL)showsGrid {
    return (_inspectingGraphicView ? [_inspectingGraphicView showsGrid] : NO);
}

- (float)gridSpacing {
    return (_inspectingGraphicView ? [_inspectingGraphicView gridSpacing] : 8);
}

- (NSColor *)gridColor {
    return (_inspectingGraphicView ? [_inspectingGraphicView gridColor] : [NSColor lightGrayColor]);
}

- (IBAction)snapsToGridCheckboxAction:(id)sender {
    if (_inspectingGraphicView) {
        [_inspectingGraphicView setSnapsToGrid:[sender state]];
    }
}

- (IBAction)showsGridCheckboxAction:(id)sender {
    if (_inspectingGraphicView) {
        [_inspectingGraphicView setShowsGrid:[sender state]];
    }
}

- (IBAction)gridSpacingSliderAction:(id)sender {
    if (_inspectingGraphicView) {
        [_inspectingGraphicView setGridSpacing:(float)[sender intValue]];
    }
    [gridView setNeedsDisplay:YES];
}

- (IBAction)gridColorWellAction:(id)sender {
    if (_inspectingGraphicView) {
        [_inspectingGraphicView setGridColor:[sender color]];
    }
    [gridView setNeedsDisplay:YES];
}

@end

void SKTDrawGridWithSettingsInRect(float spacing, NSColor *color, NSRect rect, NSPoint gridOrigin) {
    int curLine, endLine;
    NSBezierPath *gridPath = [NSBezierPath bezierPath];

    [color set];

    // Columns
    curLine = ceil((NSMinX(rect) - gridOrigin.x) / spacing);
    endLine = floor((NSMaxX(rect) - gridOrigin.x) / spacing);
    for (; curLine<=endLine; curLine++) {
        [gridPath moveToPoint:NSMakePoint((curLine * spacing) + gridOrigin.x, NSMinY(rect))];
        [gridPath lineToPoint:NSMakePoint((curLine * spacing) + gridOrigin.x, NSMaxY(rect))];
    }

    // Rows
    curLine = ceil((NSMinY(rect) - gridOrigin.y) / spacing);
    endLine = floor((NSMaxY(rect) - gridOrigin.y) / spacing);
    for (; curLine<=endLine; curLine++) {
        [gridPath moveToPoint:NSMakePoint(NSMinX(rect), (curLine * spacing) + gridOrigin.y)];
        [gridPath lineToPoint:NSMakePoint(NSMaxX(rect), (curLine * spacing) + gridOrigin.y)];
    }

    [gridPath setLineWidth:0.0];
    [gridPath stroke];
}



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