[iOS] Add experimental new keyboard accessory view.

ios/chrome/browser/ui/toolbar/new_keyboard_accessory_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/toolbar/new_keyboard_accessory_view.h"
+
+#import <NotificationCenter/NotificationCenter.h>
+
+#include "base/mac/foundation_util.h"
+#include "ios/chrome/browser/experimental_flags.h"
+#include "ios/chrome/browser/ui/commands/ios_command_ids.h"
+#import "ios/chrome/browser/ui/fancy_ui/colored_button.h"
+#include "ios/chrome/browser/ui/rtl_geometry.h"
+#include "ios/chrome/browser/ui/ui_util.h"
+#import "ios/chrome/browser/ui/uikit_ui_util.h"
+#include "ios/chrome/grit/ios_strings.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@interface NewKeyboardAccessoryView ()
+
+@property(nonatomic, weak) id<KeyboardAccessoryViewDelegate> delegate;
+
+// Called when a keyboard shortcut button is pressed.
+- (void)keyboardButtonPressed:(NSString*)title;
+// Creates a button shortcut for |title|.
+- (UIView*)shortcutButtonWithTitle:(NSString*)title;
+// Creates a button with an icon based on |iconName|.
+- (UIButton*)iconButton:(NSString*)iconName;
+
+@end
+
+@implementation NewKeyboardAccessoryView
+
+// Unused by this implementation of |KeyboardAccessoryViewProtocol|.
+@synthesize mode = _mode;
+
+@synthesize delegate = _delegate;
+
+- (instancetype)initWithButtons:(NSArray<NSString*>*)buttonTitles
+                       delegate:(id<KeyboardAccessoryViewDelegate>)delegate {
+  const CGFloat kButtonMinSizeX = 61.0;
+  const CGFloat kButtonMinSizeXCompact = 32.0;
+  const CGFloat kButtonSizeY = 62.0;
+  const CGFloat kButtonSizeYCompact = 30.0;
+  const CGFloat kBetweenButtonSpacing = 15.0;
+  const CGFloat kBetweenButtonSpacingCompact = 6.0;
+  const CGFloat kSeparatorAlpha = 0.1;
+  const CGFloat kViewHeight = 70.0;
+  const CGFloat kViewHeightCompact = 43.0;
+  const BOOL isCompact = IsCompact();
+
+  CGFloat width = [[UIScreen mainScreen] bounds].size.width;
+  CGFloat height = isCompact ? kViewHeightCompact : kViewHeight;
+  CGRect frame = CGRectMake(0.0, 0.0, width, height);
+
+  self = [super initWithFrame:frame inputViewStyle:UIInputViewStyleKeyboard];
+  if (self) {
+    _delegate = delegate;
+
+    // Create and add stackview filled with the shortcut buttons.
+    UIStackView* stackView = [[UIStackView alloc] init];
+    [stackView setTranslatesAutoresizingMaskIntoConstraints:NO];
+    stackView.spacing =
+        isCompact ? kBetweenButtonSpacingCompact : kBetweenButtonSpacing;
+    for (NSString* title in buttonTitles) {
+      UIView* button = [self shortcutButtonWithTitle:title];
+      [button setTranslatesAutoresizingMaskIntoConstraints:NO];
+      CGFloat buttonMinWidth =
+          isCompact ? kButtonMinSizeXCompact : kButtonMinSizeX;
+      [button.widthAnchor constraintGreaterThanOrEqualToConstant:buttonMinWidth]
+          .active = YES;
+      CGFloat buttonHeight = isCompact ? kButtonSizeYCompact : kButtonSizeY;
+      [button.heightAnchor constraintEqualToConstant:buttonHeight].active = YES;
+      [stackView addArrangedSubview:button];
+    }
+    [self addSubview:stackView];
+
+    // Create and add buttons for voice and camera search.
+    UIButton* cameraButton = [self iconButton:@"qr_scanner_keyboard_accessory"];
+    [cameraButton
+               addTarget:_delegate
+                  action:@selector(keyboardAccessoryCameraSearchTouchUpInside)
+        forControlEvents:UIControlEventTouchUpInside];
+    [self addSubview:cameraButton];
+
+    UIButton* voiceSearchButton =
+        [self iconButton:@"voice_icon_keyboard_accessory"];
+    [self addSubview:voiceSearchButton];
+    [voiceSearchButton
+               addTarget:_delegate
+                  action:@selector(keyboardAccessoryVoiceSearchTouchDown)
+        forControlEvents:UIControlEventTouchDown];
+    [voiceSearchButton
+               addTarget:_delegate
+                  action:@selector(keyboardAccessoryVoiceSearchTouchUpInside)
+        forControlEvents:UIControlEventTouchUpInside];
+
+    // Create and add 1 pixel high separator view.
+    UIView* separator = [[UIView alloc] init];
+    [separator setTranslatesAutoresizingMaskIntoConstraints:NO];
+    [separator
+        setBackgroundColor:[UIColor colorWithWhite:0 alpha:kSeparatorAlpha]];
+    [separator.heightAnchor
+        constraintEqualToConstant:1.0 / [[UIScreen mainScreen] scale]]
+        .active = YES;
+    [self addSubview:separator];
+
+    // Position all the views.
+    NSDictionary* viewsDictionary = @{
+      @"cameraButton" : cameraButton,
+      @"voiceSearch" : voiceSearchButton,
+      @"stackView" : stackView,
+      @"separator" : separator,
+    };
+    NSArray* constraints = @[
+      @"H:|-8-[cameraButton]-8-[voiceSearch]-(>=16)-[stackView]",
+      @"H:|-0-[separator]-0-|",
+      @"V:[separator]-0-|",
+    ];
+    ApplyVisualConstraintsWithOptions(constraints, viewsDictionary,
+                                      LayoutOptionForRTLSupport(), self);
+    AddSameCenterYConstraint(self, cameraButton);
+    AddSameCenterYConstraint(self, voiceSearchButton);
+    AddSameCenterYConstraint(self, stackView);
+    // The following constraint is supposed to break if there's not enough
+    // space to center the stack view.
+    NSLayoutConstraint* horizontallyCenterStackViewConstraint =
+        [self.centerXAnchor constraintEqualToAnchor:stackView.centerXAnchor];
+    horizontallyCenterStackViewConstraint.priority =
+        UILayoutPriorityDefaultHigh;
+    horizontallyCenterStackViewConstraint.active = YES;
+  }
+  return self;
+}
+
+- (UIView*)shortcutButtonWithTitle:(NSString*)title {
+  const CGFloat kCornerRadius = 4.0;
+  const CGFloat kAlphaStateNormal = 0.1;
+  const CGFloat kAlphaStateHighlighted = 0.2;
+  const CGFloat kHorizontalEdgeInset = 8;
+  const CGFloat kIpadButtonTitleFontSize = 20.0;
+  const CGFloat kIphoneButtonTitleFontSize = 15.0;
+
+  ColoredButton* button = [ColoredButton buttonWithType:UIButtonTypeCustom];
+  UIFont* font = nil;
+
+  [button setTitle:title forState:UIControlStateNormal];
+  [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
+
+  [button setBackgroundColor:UIColorFromRGB(0, kAlphaStateNormal)
+                    forState:UIControlStateNormal];
+  [button setBackgroundColor:UIColorFromRGB(0, kAlphaStateHighlighted)
+                    forState:UIControlStateHighlighted];
+
+  button.layer.cornerRadius = kCornerRadius;
+  button.contentEdgeInsets =
+      UIEdgeInsetsMake(0, kHorizontalEdgeInset, 0, kHorizontalEdgeInset);
+  button.clipsToBounds = YES;
+
+  if (IsIPadIdiom()) {
+    font = [UIFont systemFontOfSize:kIpadButtonTitleFontSize];
+  } else {
+    font = [UIFont boldSystemFontOfSize:kIphoneButtonTitleFontSize];
+  }
+
+  [button.titleLabel setFont:font];
+
+  [button addTarget:self
+                action:@selector(keyboardButtonPressed:)
+      forControlEvents:UIControlEventTouchUpInside];
+  button.isAccessibilityElement = YES;
+  [button setAccessibilityLabel:title];
+  return button;
+}
+
+- (UIButton*)iconButton:(NSString*)iconName {
+  const CGFloat kIconTintAlphaStateNormal = 0.45;
+  const CGFloat kIconTintAlphaStateHighlighted = 0.6;
+
+  UIColor* iconTintStateNormal = UIColorFromRGB(0, kIconTintAlphaStateNormal);
+  UIColor* iconTintStateHighlighted =
+      UIColorFromRGB(0, kIconTintAlphaStateHighlighted);
+
+  ColoredButton* button = [ColoredButton buttonWithType:UIButtonTypeCustom];
+
+  [button setTintColor:iconTintStateNormal forState:UIControlStateNormal];
+  [button setTintColor:iconTintStateHighlighted
+              forState:UIControlStateHighlighted];
+  [button setTranslatesAutoresizingMaskIntoConstraints:NO];
+  UIImage* icon = [[UIImage imageNamed:iconName]
+      imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
+  [button setImage:icon forState:UIControlStateNormal];
+  return button;
+}
+
+- (BOOL)enableInputClicksWhenVisible {
+  return YES;
+}
+
+- (void)keyboardButtonPressed:(id)sender {
+  UIButton* button = base::mac::ObjCCastStrict<UIButton>(sender);
+  [[UIDevice currentDevice] playInputClick];
+  [_delegate keyPressed:[button currentTitle]];
+}
+
+@end