Adding close button in SigninPromoView

ios/chrome/browser/ui/authentication/signin_promo_view.mm

 // Copyright 2017 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/authentication/signin_promo_view.h"
 
 #include "base/logging.h"
 #import "ios/chrome/browser/ui/colors/MDCPalette+CrAdditions.h"
 #import "ios/chrome/browser/ui/commands/UIKit+ChromeExecuteCommand.h"
 #import "ios/chrome/browser/ui/commands/show_signin_command.h"
@@ skipping 11 matching lines @@
 // Horizontal padding for label and buttons.
 const CGFloat kHorizontalPadding = 40;
 // Vertical padding for the image and the label.
 const CGFloat kVerticalPadding = 12;
 // Vertical padding for buttons.
 const CGFloat kButtonVerticalPadding = 6;
 // Image size for warm state.
 const CGFloat kProfileImageFixedSize = 48;
 // Button height.
 const CGFloat kButtonHeight = 36;
+// Dismiss button size.
+const CGFloat kDismissButtonSize = 24;
 }
 
 @implementation SigninPromoView {
   NSArray<NSLayoutConstraint*>* _coldStateConstraints;
   NSArray<NSLayoutConstraint*>* _warmStateConstraints;
 }
 
 @synthesize mode = _mode;
 @synthesize imageView = _imageView;
 @synthesize textLabel = _textLabel;
 @synthesize primaryButton = _primaryButton;
 @synthesize secondaryButton = _secondaryButton;
+@synthesize dismissButton = _dismissButton;
 @synthesize sendChromeCommand = _sendChromeCommand;
 
 - (instancetype)initWithFrame:(CGRect)frame {
   self = [super initWithFrame:frame];
   if (self) {
     self.isAccessibilityElement = YES;
 
     // Adding subviews.
     self.clipsToBounds = YES;
     _imageView = [[UIImageView alloc] init];
@@ skipping 14 matching lines @@
     [self addSubview:_primaryButton];
 
     _secondaryButton = [[MDCFlatButton alloc] init];
     _secondaryButton.translatesAutoresizingMaskIntoConstraints = NO;
     _secondaryButton.accessibilityIdentifier = @"signin_promo_secondary_button";
     [_secondaryButton addTarget:self
                          action:@selector(onSecondaryButtonAction:)
                forControlEvents:UIControlEventTouchUpInside];
     [self addSubview:_secondaryButton];
 
+    _dismissButton = [[UIButton alloc]
+        initWithFrame:CGRectMake(0, 0, kDismissButtonSize, kDismissButtonSize)];
+    _dismissButton.translatesAutoresizingMaskIntoConstraints = NO;
+    _dismissButton.hidden = YES;
+    [self addSubview:_dismissButton];
+
     // Adding style.
     _imageView.contentMode = UIViewContentModeCenter;
     _imageView.layer.masksToBounds = YES;
     _imageView.contentMode = UIViewContentModeScaleAspectFit;
 
     _textLabel.font = [MDCTypography buttonFont];
     _textLabel.textColor = [[MDCPalette greyPalette] tint900];
     _textLabel.numberOfLines = 0;
     _textLabel.textAlignment = NSTextAlignmentCenter;
 
     [_primaryButton setBackgroundColor:[[MDCPalette cr_bluePalette] tint500]
                               forState:UIControlStateNormal];
     _primaryButton.customTitleColor = [UIColor whiteColor];
     _primaryButton.inkColor = [UIColor colorWithWhite:1 alpha:0.2];
 
     _secondaryButton.customTitleColor = [[MDCPalette cr_bluePalette] tint500];
     _secondaryButton.uppercaseTitle = NO;
 
+    [_dismissButton setImage:[UIImage imageNamed:@"signin_promo_dismiss_gray"]
+                    forState:UIControlStateNormal];
+
     // Adding constraints.
     NSDictionary* metrics = @{
       @"kButtonHeight" : @(kButtonHeight),
       @"kButtonVerticalPadding" : @(kButtonVerticalPadding),
       @"kButtonVerticalPaddingx2" : @(kButtonVerticalPadding * 2),
       @"kHorizontalPadding" : @(kHorizontalPadding),
       @"kVerticalPadding" : @(kVerticalPadding),
       @"kVerticalPaddingx2" : @(kVerticalPadding * 2),
       @"kVerticalPaddingkButtonVerticalPadding" :
           @(kVerticalPadding + kButtonVerticalPadding),
     };
     NSDictionary* views = @{
+      @"dismissButton" : _dismissButton,
       @"imageView" : _imageView,
       @"primaryButton" : _primaryButton,
       @"secondaryButton" : _secondaryButton,
       @"textLabel" : _textLabel,
     };
 
     // Constraints shared between modes.
     NSString* sharedVerticalConstraints =
         @"V:|-kVerticalPaddingx2-[imageView]-kVerticalPadding-[textLabel]-"
         @"kVerticalPaddingkButtonVerticalPadding-[primaryButton(kButtonHeight)"
@@ skipping 16 matching lines @@
     NSString* warmStateVerticalConstraints =
         @"V:[primaryButton]-kButtonVerticalPaddingx2-[secondaryButton("
         @"kButtonHeight)]-kVerticalPaddingkButtonVerticalPadding-|";
     NSArray* warmStateVisualConstraints = @[
       warmStateVerticalConstraints,
       @"H:|-kHorizontalPadding-[secondaryButton]-kHorizontalPadding-|",
     ];
     _warmStateConstraints = VisualConstraintsWithMetrics(
         warmStateVisualConstraints, views, metrics);
 
+    // Constraints for the dismiss button.
+    NSArray* buttonVisualConstraints =
+        @[ @"H:[dismissButton]-|", @"V:|-[dismissButton]" ];
+    ApplyVisualConstraints(buttonVisualConstraints, views);
+
     _mode = SigninPromoViewModeColdState;
     [self activateColdMode];
   }
   return self;
 }
 
 - (void)setMode:(SigninPromoViewMode)mode {
   if (mode == _mode) {
     return;
   }
@@ skipping 105 matching lines @@
                 target:self
               selector:@selector(accessibilitySecondaryAction:)];
   return @[ primaryCustomAction, secondaryCustomAction ];
 }
 
 - (NSString*)accessibilityLabel {
   return _textLabel.text;
 }
 
 @end