Upstream Chrome on iOS source code [5/11].

ios/chrome/browser/ui/history/history_search_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/history/history_search_view.h"
+
+#include "base/mac/objc_property_releaser.h"
+#include "components/strings/grit/components_strings.h"
+#include "ios/chrome/browser/ui/uikit_ui_util.h"
+#import "ios/third_party/material_components_ios/src/components/Typography/src/MaterialTypography.h"
+#include "ui/base/l10n/l10n_util_mac.h"
+
+namespace {
+// Shadow opacity for the search view.
+CGFloat kShadowOpacity = 0.2f;
+// Margin for the search view.
+CGFloat kHorizontalMargin = 16.0f;
+}  // namespace
+
+@interface HistorySearchView () {
+  base::mac::ObjCPropertyReleaser propertyReleaser_HistorySearchView_;
+}
+
+// Stack view for laying out the text field and cancel button.
+@property(nonatomic, strong) UIStackView* stackView;
+// Text field for the search view.
+@property(nonatomic, strong) UITextField* textField;
+// Cancel button for dismissing the search view.
+@property(nonatomic, strong) UIButton* cancelButton;
+// Constraint for the top anchor.
+@property(nonatomic, strong) NSLayoutConstraint* topAnchorConstraint;
+
+@end
+
+@implementation HistorySearchView
+
+@synthesize enabled = _enabled;
+@synthesize stackView = _stackView;
+@synthesize textField = _textField;
+@synthesize cancelButton = _cancelButton;
+@synthesize topAnchorConstraint = _topAnchorConstraint;
+
+- (instancetype)initWithFrame:(CGRect)frame {
+  self = [super initWithFrame:frame];
+  if (self) {
+    [self setBackgroundColor:[UIColor whiteColor]];
+    [[self layer] setShadowOpacity:kShadowOpacity];
+
+    _textField = [[UITextField alloc] init];
+    _textField.contentVerticalAlignment =
+        UIControlContentVerticalAlignmentCenter;
+    _textField.backgroundColor = [UIColor whiteColor];
+    _textField.textColor =
+        [UIColor colorWithWhite:0 alpha:[MDCTypography body1FontOpacity]];
+    _textField.font = [MDCTypography subheadFont];
+    _textField.borderStyle = UITextBorderStyleNone;
+    [_textField setLeftViewMode:UITextFieldViewModeNever];
+    _textField.clearButtonMode = UITextFieldViewModeAlways;
+    _textField.placeholder = l10n_util::GetNSString(IDS_HISTORY_SEARCH_BUTTON);
+
+    _cancelButton = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
+    [_cancelButton setImage:[UIImage imageNamed:@"collapse"]
+                   forState:UIControlStateNormal];
+    [_cancelButton setImage:[UIImage imageNamed:@"collapse_pressed"]
+                   forState:UIControlStateHighlighted];
+    [_cancelButton
+        setContentCompressionResistancePriority:UILayoutPriorityRequired
+                                        forAxis:
+                                            UILayoutConstraintAxisHorizontal];
+    [_cancelButton setContentHuggingPriority:UILayoutPriorityRequired
+                                     forAxis:UILayoutConstraintAxisHorizontal];
+    [_cancelButton setAccessibilityLabel:l10n_util::GetNSString(IDS_CANCEL)];
+
+    _stackView = [[UIStackView alloc]
+        initWithArrangedSubviews:@[ _textField, _cancelButton ]];
+    _stackView.alignment = UIStackViewAlignmentFill;
+    _stackView.axis = UILayoutConstraintAxisHorizontal;
+    _stackView.distribution = UIStackViewDistributionFill;
+    [self addSubview:_stackView];
+    _stackView.translatesAutoresizingMaskIntoConstraints = NO;
+    _stackView.layoutMarginsRelativeArrangement = YES;
+
+    CGFloat topAnchorConstant = IsCompact() ? StatusBarHeight() : 0;
+    _topAnchorConstraint = [[_stackView.topAnchor
+        constraintEqualToAnchor:self.topAnchor
+                       constant:topAnchorConstant] retain];
+    [NSLayoutConstraint activateConstraints:@[
+      _topAnchorConstraint,
+      [_stackView.bottomAnchor constraintEqualToAnchor:self.bottomAnchor],
+      [_stackView.layoutMarginsGuide.leadingAnchor
+          constraintEqualToAnchor:self.leadingAnchor
+                         constant:kHorizontalMargin],
+      [_stackView.layoutMarginsGuide.trailingAnchor
+          constraintEqualToAnchor:self.trailingAnchor
+                         constant:-kHorizontalMargin],
+    ]];
+
+    propertyReleaser_HistorySearchView_.Init(self, [HistorySearchView class]);
+  }
+  return self;
+}
+
+- (BOOL)becomeFirstResponder {
+  return [self.textField becomeFirstResponder];
+}
+
+- (void)setEnabled:(BOOL)enabled {
+  _enabled = enabled;
+  self.cancelButton.enabled = enabled;
+  self.textField.enabled = enabled;
+  self.textField.clearButtonMode =
+      enabled ? UITextFieldViewModeAlways : UITextFieldViewModeNever;
+}
+
+- (void)setCancelTarget:(id)target action:(SEL)action {
+  [_cancelButton addTarget:target
+                    action:action
+          forControlEvents:UIControlEventTouchUpInside];
+}
+
+- (void)setSearchBarDelegate:(id<UITextFieldDelegate>)delegate {
+  [self.textField setDelegate:delegate];
+}
+
+- (void)clearText {
+  self.textField.text = nil;
+}
+
+#pragma mark - UITraitEnvironment
+
+- (void)traitCollectionDidChange:(UITraitCollection*)previousTraitCollection {
+  self.topAnchorConstraint.constant = IsCompact() ? StatusBarHeight() : 0;
+}
+
+@end