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#import "GBImageView.h"
@implementation GBImageViewGridConfiguration
- (instancetype)initWithColor:(NSColor *)color size:(NSUInteger)size
{
self = [super init];
self.color = color;
self.size = size;
return self;
}
@end
@interface GBGridView : NSView
@end
@implementation GBGridView
- (void)drawRect:(NSRect)dirtyRect
{
GBImageView *parent = (GBImageView *)self.superview;
CGFloat y_ratio = parent.frame.size.height / parent.image.size.height;
CGFloat x_ratio = parent.frame.size.width / parent.image.size.width;
for (GBImageViewGridConfiguration *conf in parent.verticalGrids) {
[conf.color set];
for (CGFloat y = conf.size * y_ratio; y < self.frame.size.height; y += conf.size * y_ratio) {
NSBezierPath *line = [NSBezierPath bezierPath];
[line moveToPoint:NSMakePoint(0, y - 0.5)];
[line lineToPoint:NSMakePoint(self.frame.size.width, y - 0.5)];
[line setLineWidth:1.0];
[line stroke];
}
}
for (GBImageViewGridConfiguration *conf in parent.horizontalGrids) {
[conf.color set];
for (CGFloat x = conf.size * x_ratio; x < self.frame.size.width; x += conf.size * x_ratio) {
NSBezierPath *line = [NSBezierPath bezierPath];
[line moveToPoint:NSMakePoint(x + 0.5, 0)];
[line lineToPoint:NSMakePoint(x + 0.5, self.frame.size.height)];
[line setLineWidth:1.0];
[line stroke];
}
}
if (parent.displayScrollRect) {
// CGRectInfinite in NSBezierPath is broken in newer macOS versions
NSBezierPath *path = [NSBezierPath bezierPathWithRect:CGRectMake(-0x4000, -0x4000, 0x8000, 0x8000)];
for (unsigned x = 0; x < 2; x++) {
for (unsigned y = 0; y < 2; y++) {
NSRect rect = parent.scrollRect;
rect.origin.x *= x_ratio;
rect.origin.y *= y_ratio;
rect.size.width *= x_ratio;
rect.size.height *= y_ratio;
rect.origin.y = self.frame.size.height - rect.origin.y - rect.size.height;
rect.origin.x -= self.frame.size.width * x;
rect.origin.y += self.frame.size.height * y;
NSBezierPath *subpath = [NSBezierPath bezierPathWithRect:rect];
[path appendBezierPath:subpath];
}
}
[path setWindingRule:NSEvenOddWindingRule];
[path setLineWidth:4.0];
[path setLineJoinStyle:NSRoundLineJoinStyle];
[[NSColor colorWithWhite:0.2 alpha:0.5] set];
[path fill];
[path addClip];
[[NSColor colorWithWhite:0.0 alpha:0.6] set];
[path stroke];
}
}
@end
@implementation GBImageView
{
NSTrackingArea *_trackingArea;
GBGridView *_gridView;
NSRect _scrollRect;
}
- (instancetype)initWithCoder:(NSCoder *)coder
{
self = [super initWithCoder:coder];
self.wantsLayer = true;
_gridView = [[GBGridView alloc] initWithFrame:self.bounds];
_gridView.autoresizingMask = NSViewWidthSizable | NSViewHeightSizable;
[self addSubview:_gridView];
return self;
}
-(void)viewWillDraw
{
[super viewWillDraw];
for (CALayer *layer in self.layer.sublayers) {
layer.magnificationFilter = kCAFilterNearest;
}
}
- (void)setHorizontalGrids:(NSArray *)horizontalGrids
{
self->_horizontalGrids = horizontalGrids;
[_gridView setNeedsDisplay:true];
}
- (void)setVerticalGrids:(NSArray *)verticalGrids
{
self->_verticalGrids = verticalGrids;
[_gridView setNeedsDisplay:true];
}
- (void)setDisplayScrollRect:(bool)displayScrollRect
{
self->_displayScrollRect = displayScrollRect;
[_gridView setNeedsDisplay:true];
}
- (void)updateTrackingAreas
{
if (_trackingArea != nil) {
[self removeTrackingArea:_trackingArea];
}
_trackingArea = [ [NSTrackingArea alloc] initWithRect:[self bounds]
options:NSTrackingMouseEnteredAndExited | NSTrackingActiveAlways | NSTrackingMouseMoved
owner:self
userInfo:nil];
[self addTrackingArea:_trackingArea];
}
- (void)mouseExited:(NSEvent *)theEvent
{
if ([self.delegate respondsToSelector:@selector(mouseDidLeaveImageView:)]) {
[self.delegate mouseDidLeaveImageView:self];
}
}
- (void)mouseMoved:(NSEvent *)theEvent
{
if ([self.delegate respondsToSelector:@selector(imageView:mouseMovedToX:Y:)]) {
NSPoint location = [self convertPoint:theEvent.locationInWindow fromView:nil];
location.x /= self.bounds.size.width;
location.y /= self.bounds.size.height;
location.y = 1 - location.y;
location.x *= self.image.size.width;
location.y *= self.image.size.height;
[self.delegate imageView:self mouseMovedToX:(NSUInteger)location.x Y:(NSUInteger)location.y];
}
}
- (void)setScrollRect:(NSRect)scrollRect
{
if (memcmp(&scrollRect, &_scrollRect, sizeof(scrollRect)) != 0) {
_scrollRect = scrollRect;
[_gridView setNeedsDisplay:true];
}
}
- (NSRect)scrollRect
{
return _scrollRect;
}
@end
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