session-ios/Session/Signal/ConversationView/Cells/OWSBubbleShapeView.m
2020-11-12 08:48:41 +11:00

290 lines
7 KiB
Objective-C

//
// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
//
#import "OWSBubbleShapeView.h"
#import "OWSBubbleView.h"
#import <SignalUtilitiesKit/UIView+OWS.h>
NS_ASSUME_NONNULL_BEGIN
typedef NS_ENUM(NSUInteger, OWSBubbleShapeViewMode) {
// For stroking or filling.
OWSBubbleShapeViewMode_Draw,
OWSBubbleShapeViewMode_Shadow,
OWSBubbleShapeViewMode_Clip,
OWSBubbleShapeViewMode_InnerShadow,
};
@interface OWSBubbleShapeView ()
@property (nonatomic) OWSBubbleShapeViewMode mode;
@property (nonatomic) CAShapeLayer *shapeLayer;
@property (nonatomic) CAShapeLayer *maskLayer;
@property (nonatomic, nullable, weak) OWSBubbleView *bubbleView;
@property (nonatomic) BOOL isConfigured;
@end
#pragma mark -
@implementation OWSBubbleShapeView
- (void)configure
{
self.opaque = NO;
self.backgroundColor = [UIColor clearColor];
self.layoutMargins = UIEdgeInsetsZero;
self.shapeLayer = [CAShapeLayer new];
[self.layer addSublayer:self.shapeLayer];
self.maskLayer = [CAShapeLayer new];
self.isConfigured = YES;
[self updateLayers];
}
- (instancetype)initDraw
{
self = [super initWithFrame:CGRectZero];
if (!self) {
return self;
}
self.mode = OWSBubbleShapeViewMode_Draw;
[self configure];
return self;
}
- (instancetype)initShadow
{
self = [super initWithFrame:CGRectZero];
if (!self) {
return self;
}
self.mode = OWSBubbleShapeViewMode_Shadow;
[self configure];
return self;
}
- (instancetype)initClip
{
self = [super initWithFrame:CGRectZero];
if (!self) {
return self;
}
self.mode = OWSBubbleShapeViewMode_Clip;
[self configure];
return self;
}
- (instancetype)initInnerShadowWithColor:(UIColor *)color radius:(CGFloat)radius opacity:(float)opacity
{
self = [super initWithFrame:CGRectZero];
if (!self) {
return self;
}
self.mode = OWSBubbleShapeViewMode_InnerShadow;
_innerShadowColor = color;
_innerShadowRadius = radius;
_innerShadowOpacity = opacity;
[self configure];
return self;
}
- (void)setFillColor:(nullable UIColor *)fillColor
{
_fillColor = fillColor;
[self updateLayers];
}
- (void)setStrokeColor:(nullable UIColor *)strokeColor
{
_strokeColor = strokeColor;
[self updateLayers];
}
- (void)setStrokeThickness:(CGFloat)strokeThickness
{
_strokeThickness = strokeThickness;
[self updateLayers];
}
- (void)setInnerShadowColor:(nullable UIColor *)innerShadowColor
{
_innerShadowColor = innerShadowColor;
[self updateLayers];
}
- (void)setInnerShadowRadius:(CGFloat)innerShadowRadius
{
_innerShadowRadius = innerShadowRadius;
[self updateLayers];
}
- (void)setInnerShadowOpacity:(float)innerShadowOpacity
{
_innerShadowOpacity = innerShadowOpacity;
[self updateLayers];
}
- (void)setFrame:(CGRect)frame
{
BOOL didChange = !CGRectEqualToRect(self.frame, frame);
[super setFrame:frame];
if (didChange) {
[self updateLayers];
}
}
- (void)setBounds:(CGRect)bounds
{
BOOL didChange = !CGRectEqualToRect(self.bounds, bounds);
[super setBounds:bounds];
if (didChange) {
[self updateLayers];
}
}
- (void)setCenter:(CGPoint)center
{
[super setCenter:center];
[self updateLayers];
}
- (void)setBubbleView:(nullable OWSBubbleView *)bubbleView
{
_bubbleView = bubbleView;
[self updateLayers];
}
- (void)updateLayers
{
if (!self.shapeLayer) {
return;
}
if (!self.bubbleView) {
return;
}
if (!self.isConfigured) {
return;
}
// Prevent the layer from animating changes.
[CATransaction begin];
[CATransaction setDisableActions:YES];
UIBezierPath *bezierPath = [UIBezierPath new];
// Add the bubble view's path to the local path.
UIBezierPath *bubbleBezierPath = [self.bubbleView maskPath];
// We need to convert between coordinate systems using layers, not views.
CGPoint bubbleOffset = [self.layer convertPoint:CGPointZero fromLayer:self.bubbleView.layer];
CGAffineTransform transform = CGAffineTransformMakeTranslation(bubbleOffset.x, bubbleOffset.y);
[bubbleBezierPath applyTransform:transform];
[bezierPath appendPath:bubbleBezierPath];
switch (self.mode) {
case OWSBubbleShapeViewMode_Draw: {
UIBezierPath *boundsBezierPath = [UIBezierPath bezierPathWithRect:self.bounds];
[bezierPath appendPath:boundsBezierPath];
self.clipsToBounds = YES;
if (self.strokeColor) {
self.shapeLayer.strokeColor = self.strokeColor.CGColor;
self.shapeLayer.lineWidth = self.strokeThickness;
self.shapeLayer.zPosition = 100.f;
} else {
self.shapeLayer.strokeColor = nil;
self.shapeLayer.lineWidth = 0.f;
}
if (self.fillColor) {
self.shapeLayer.fillColor = self.fillColor.CGColor;
} else {
self.shapeLayer.fillColor = nil;
}
self.shapeLayer.path = bezierPath.CGPath;
break;
}
case OWSBubbleShapeViewMode_Shadow:
self.clipsToBounds = NO;
if (self.fillColor) {
self.shapeLayer.fillColor = self.fillColor.CGColor;
} else {
self.shapeLayer.fillColor = nil;
}
self.shapeLayer.path = bezierPath.CGPath;
self.shapeLayer.frame = self.bounds;
self.shapeLayer.masksToBounds = YES;
break;
case OWSBubbleShapeViewMode_Clip:
self.maskLayer.path = bezierPath.CGPath;
self.layer.mask = self.maskLayer;
break;
case OWSBubbleShapeViewMode_InnerShadow: {
self.maskLayer.path = bezierPath.CGPath;
self.layer.mask = self.maskLayer;
// Inner shadow.
// This should usually not be visible; it is used to distinguish
// profile pics from the background if they are similar.
self.shapeLayer.frame = self.bounds;
self.shapeLayer.masksToBounds = YES;
CGRect shadowBounds = self.bounds;
UIBezierPath *shadowPath = [bezierPath copy];
// This can be any value large enough to cast a sufficiently large shadow.
CGFloat shadowInset = -(self.innerShadowRadius * 4.f);
[shadowPath
appendPath:[UIBezierPath bezierPathWithRect:CGRectInset(shadowBounds, shadowInset, shadowInset)]];
// This can be any color since the fill should be clipped.
self.shapeLayer.fillColor = UIColor.blackColor.CGColor;
self.shapeLayer.path = shadowPath.CGPath;
self.shapeLayer.fillRule = kCAFillRuleEvenOdd;
self.shapeLayer.shadowColor = self.innerShadowColor.CGColor;
self.shapeLayer.shadowRadius = self.innerShadowRadius;
self.shapeLayer.shadowOpacity = self.innerShadowOpacity;
self.shapeLayer.shadowOffset = CGSizeZero;
break;
}
}
[CATransaction commit];
}
@end
NS_ASSUME_NONNULL_END