Creates FaviconAttributesProvider.

ios/chrome/browser/ui/favicon_view.mm

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ios/chrome/browser/ui/favicon_view.h"
+
+#include "base/mac/objc_property_releaser.h"
+#import "ios/chrome/browser/ui/uikit_ui_util.h"
+
+namespace {
+// Default corner radius for the favicon image view.
+const CGFloat kDefaultCornerRadius = 3;
+}
+
+@interface FaviconViewNew () {
+  // Property releaser for FaviconViewNew.
+  base::mac::ObjCPropertyReleaser _propertyReleaser_FaviconViewNew;
+}
+
+// Image view for the favicon.
+@property(nonatomic, retain) UIImageView* faviconImageView;
+// Label for fallback favicon placeholder.
+@property(nonatomic, retain) UILabel* faviconFallbackLabel;
+
+@end
+
+@implementation FaviconViewNew
+@synthesize faviconImageView = _faviconImageView;
+@synthesize faviconFallbackLabel = _faviconFallbackLabel;
+
++ (CGFloat)defaultSize {
+  return 24.0f;
+}
+
++ (CGFloat)minSize {
+  return 16.0f;
+}
+
+- (instancetype)initWithFrame:(CGRect)frame {
+  self = [super initWithFrame:frame];
+  if (self) {
+    _propertyReleaser_FaviconViewNew.Init(self, [FaviconViewNew class]);
+    _faviconImageView = [[UIImageView alloc] initWithFrame:self.bounds];
+    _faviconImageView.clipsToBounds = YES;
+    _faviconImageView.layer.cornerRadius = kDefaultCornerRadius;
+    _faviconImageView.image = nil;
+
+    _faviconFallbackLabel = [[UILabel alloc] initWithFrame:self.bounds];
+    _faviconFallbackLabel.backgroundColor = [UIColor clearColor];
+    _faviconFallbackLabel.textAlignment = NSTextAlignmentCenter;
+    _faviconFallbackLabel.isAccessibilityElement = NO;
+    _faviconFallbackLabel.clipsToBounds = YES;
+    _faviconFallbackLabel.layer.cornerRadius = kDefaultCornerRadius;
+    _faviconFallbackLabel.text = nil;
+
+    [self addSubview:_faviconFallbackLabel];
+    [self addSubview:_faviconImageView];
+
+    [_faviconImageView setTranslatesAutoresizingMaskIntoConstraints:NO];
+    [_faviconFallbackLabel setTranslatesAutoresizingMaskIntoConstraints:NO];
+
+    // Both image and fallback label are centered and match the size of favicon.
+    AddSameCenterConstraints(_faviconImageView, _faviconFallbackLabel);
+    AddSameSizeConstraint(_faviconFallbackLabel, self);

[Jackie Quinn, 2016/09/23 23:11:01]

I think we may still need to constrain the subview centers to self's center? For
orientation changes, etc. 

[stkhapugin, 2016/09/26 15:51:36]

You are right! I don't know why it even worked. Good catch!

+    AddSameSizeConstraint(_faviconImageView, self);
+  }
+  return self;
+}
+
+- (void)configureWithAttribues:(FaviconAttributes* _Nonnull)attributes {
+  if (attributes.faviconImage) {
+    self.faviconImageView.image = attributes.faviconImage;
+    self.faviconImageView.hidden = NO;
+    self.faviconFallbackLabel.hidden = YES;
+  } else {
+    self.faviconFallbackLabel.backgroundColor = attributes.backgroundColor;
+    self.faviconFallbackLabel.textColor = attributes.textColor;
+    self.faviconFallbackLabel.text = attributes.monogramString;
+    self.faviconFallbackLabel.hidden = NO;
+    self.faviconImageView.hidden = YES;
+  }
+}
+
+- (void)setFont:(UIFont* _Nonnull)font {
+  self.faviconFallbackLabel.font = font;
+}
+
+@end