[iOS] Factor out the KeyboardAccessoryView.

ios/chrome/browser/ui/toolbar/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/keyboard_accessory_view.h"
+
+#include "base/mac/foundation_util.h"
+#include "ios/chrome/browser/ui/commands/ios_command_ids.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 KeyboardAccessoryView ()
+
+@property(nonatomic, weak) id<KeyboardAccessoryViewDelegate> delegate;
+@property(nonatomic, retain) UIButton* voiceSearchButton;
+
+// Creates a button with the same appearance as a keyboard key.
+- (UIView*)keyboardButtonWithTitle:(NSString*)title frame:(CGRect)frame;
+// Called when a keyboard shortcut button is pressed.
+- (void)keyboardButtonPressed:(NSString*)title;
+
+@end
+
+@implementation KeyboardAccessoryView
+
+@synthesize mode = _mode;
+@synthesize delegate = _delegate;
+@synthesize voiceSearchButton = _voiceSearchButton;
+
+- (instancetype)initWithButtons:(NSArray<NSString*>*)buttonTitles
+                       delegate:(id<KeyboardAccessoryViewDelegate>)delegate {
+  const CGFloat kViewHeight = 70.0;
+  const CGFloat kViewHeightCompact = 43.0;
+  const CGFloat kButtonInset = 5.0;
+  const CGFloat kButtonSizeX = 61.0;
+  const CGFloat kButtonSizeXCompact = 46.0;
+  const CGFloat kButtonSizeY = 62.0;
+  const CGFloat kButtonSizeYCompact = 35.0;
+  const CGFloat kBetweenButtonSpacing = 15.0;
+  const CGFloat kBetweenButtonSpacingCompact = 7.0;
+  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;
+
+    // Center buttons in available space by placing them within a parent view
+    // that auto-centers.
+    CGFloat betweenButtonSpacing =
+        isCompact ? kBetweenButtonSpacingCompact : kBetweenButtonSpacing;
+    const CGFloat buttonWidth = isCompact ? kButtonSizeXCompact : kButtonSizeX;
+
+    CGFloat totalWidth = (buttonTitles.count * buttonWidth) +
+                         ((buttonTitles.count - 1) * betweenButtonSpacing);
+    CGFloat indent = floor((width - totalWidth) / 2.0);
+    if (indent < kButtonInset)
+      indent = kButtonInset;
+    CGRect parentViewRect = CGRectMake(indent, 0.0, totalWidth, height);
+    UIView* parentView = [[UIView alloc] initWithFrame:parentViewRect];
+    [parentView setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin |
+                                    UIViewAutoresizingFlexibleRightMargin];
+    [self addSubview:parentView];
+
+    // Create the shortcut buttons, starting at the left edge of |parentView|.
+    CGRect currentFrame =
+        CGRectMake(0.0, kButtonInset, buttonWidth,
+                   isCompact ? kButtonSizeYCompact : kButtonSizeY);
+
+    for (NSString* title in buttonTitles) {
+      UIView* button = [self keyboardButtonWithTitle:title frame:currentFrame];
+      [parentView addSubview:button];
+      currentFrame.origin.x =
+          CGRectGetMaxX(currentFrame) + betweenButtonSpacing;
+    }
+
+    // Create the voice search button and add it over the text buttons.
+    _voiceSearchButton = [UIButton buttonWithType:UIButtonTypeCustom];
+    [_voiceSearchButton setAutoresizingMask:UIViewAutoresizingFlexibleWidth];
+    SetA11yLabelAndUiAutomationName(
+        _voiceSearchButton, IDS_IOS_ACCNAME_VOICE_SEARCH, @"Voice Search");
+    UIImage* voiceRow = [UIImage imageNamed:@"custom_row_voice"];
+    UIImage* voiceRowPressed = [UIImage imageNamed:@"custom_row_voice_pressed"];
+    [_voiceSearchButton setBackgroundImage:voiceRow
+                                  forState:UIControlStateNormal];
+    [_voiceSearchButton setBackgroundImage:voiceRowPressed
+                                  forState:UIControlStateHighlighted];
+
+    UIImage* voiceIcon = [UIImage imageNamed:@"voice_icon_keyboard_accessory"];
+    [_voiceSearchButton setAdjustsImageWhenHighlighted:NO];
+    [_voiceSearchButton setImage:voiceIcon forState:UIControlStateNormal];
+    [_voiceSearchButton setFrame:[self bounds]];
+
+    [_voiceSearchButton
+               addTarget:delegate
+                  action:@selector(keyboardAccessoryVoiceSearchTouchDown)
+        forControlEvents:UIControlEventTouchDown];
+    [_voiceSearchButton
+               addTarget:delegate
+                  action:@selector(keyboardAccessoryVoiceSearchTouchUpInside)
+        forControlEvents:UIControlEventTouchUpInside];
+    [self addSubview:_voiceSearchButton];
+  }
+
+  return self;
+}
+
+- (void)setMode:(KeyboardAccessoryViewMode)mode {
+  _mode = mode;
+  switch (mode) {
+    case VOICE_SEARCH:
+      [_voiceSearchButton setHidden:NO];
+      break;
+    case KEY_SHORTCUTS:
+      [_voiceSearchButton setHidden:YES];
+      break;
+  }
+}
+
+- (UIView*)keyboardButtonWithTitle:(NSString*)title frame:(CGRect)frame {
+  const CGFloat kIpadButtonTitleFontSize = 20.0;
+  const CGFloat kIphoneButtonTitleFontSize = 15.0;
+
+  UIButton* button = [UIButton buttonWithType:UIButtonTypeCustom];
+  UIFont* font = nil;
+  UIImage* backgroundImage = nil;
+  if (IsIPadIdiom()) {
+    font = GetUIFont(FONT_HELVETICA, false, kIpadButtonTitleFontSize);
+  } else {
+    font = GetUIFont(FONT_HELVETICA, true, kIphoneButtonTitleFontSize);
+  }
+  backgroundImage = [UIImage imageNamed:@"keyboard_button"];
+
+  button.frame = frame;
+  [button setTitle:title forState:UIControlStateNormal];
+  [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
+  [button.titleLabel setFont:font];
+  [button setBackgroundImage:backgroundImage forState:UIControlStateNormal];
+  [button addTarget:self
+                action:@selector(keyboardButtonPressed:)
+      forControlEvents:UIControlEventTouchUpInside];
+  button.isAccessibilityElement = YES;
+  [button setAccessibilityLabel:title];
+  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