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

ios/chrome/browser/ui/history/clear_browsing_bar.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/clear_browsing_bar.h"
+
+#include "base/logging.h"
+#include "base/mac/objc_property_releaser.h"
+#include "components/strings/grit/components_strings.h"
+#include "ios/chrome/browser/ui/rtl_geometry.h"
+#import "ios/chrome/browser/ui/uikit_ui_util.h"
+#import "ios/third_party/material_components_ios/src/components/Palettes/src/MaterialPalettes.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 clear browsing bar.
+CGFloat kShadowOpacity = 0.2f;
+// Horizontal margin for the contents of ClearBrowsingBar.
+CGFloat kHorizontalMargin = 8.0f;
+// Enum to specify button position in the clear browsing bar.
+typedef NS_ENUM(BOOL, ButtonPlacement) { Leading, Trailing };
+}  // namespace
+
+@interface ClearBrowsingBar () {
+  base::mac::ObjCPropertyReleaser propertyReleaser_ClearBrowsingBar_;
+}
+
+// Button that displays "Clear Browsing Data...".
+@property(nonatomic, strong) UIButton* clearBrowsingDataButton;
+// Button that displays "Edit".
+@property(nonatomic, strong) UIButton* editButton;
+// Button that displays "Delete".
+@property(nonatomic, strong) UIButton* deleteButton;
+// Button that displays "Cancel".
+@property(nonatomic, strong) UIButton* cancelButton;
+// Stack view for arranging the buttons.
+@property(nonatomic, strong) UIStackView* stackView;
+
+// Styles button for Leading or Trailing placement. Leading buttons have red
+// text that is aligned to the leading edge. Trailing buttons have blue text
+// that is aligned to the trailing edge.
+- (void)styleButton:(UIButton*)button forPlacement:(ButtonPlacement)placement;
+
+@end
+
+@implementation ClearBrowsingBar
+
+@synthesize editing = _editing;
+@synthesize clearBrowsingDataButton = _clearBrowsingDataButton;
+@synthesize editButton = _editButton;
+@synthesize deleteButton = _deleteButton;
+@synthesize cancelButton = _cancelButton;
+@synthesize stackView = _stackView;
+
+- (instancetype)initWithFrame:(CGRect)frame {
+  self = [super initWithFrame:frame];
+  if (self) {
+    _clearBrowsingDataButton =
+        [[UIButton buttonWithType:UIButtonTypeCustom] retain];
+    [_clearBrowsingDataButton
+        setTitle:l10n_util::GetNSStringWithFixup(
+                     IDS_HISTORY_OPEN_CLEAR_BROWSING_DATA_DIALOG)
+        forState:UIControlStateNormal];
+    [self styleButton:_clearBrowsingDataButton forPlacement:Leading];
+
+    _editButton = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
+    [_editButton
+        setTitle:l10n_util::GetNSString(IDS_HISTORY_START_EDITING_BUTTON)
+        forState:UIControlStateNormal];
+    [self styleButton:_editButton forPlacement:Trailing];
+
+    _deleteButton = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
+    [_deleteButton setTitle:l10n_util::GetNSString(
+                                IDS_HISTORY_DELETE_SELECTED_ENTRIES_BUTTON)
+                   forState:UIControlStateNormal];
+    [self styleButton:_deleteButton forPlacement:Leading];
+
+    _cancelButton = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
+    [_cancelButton
+        setTitle:l10n_util::GetNSString(IDS_HISTORY_CANCEL_EDITING_BUTTON)
+        forState:UIControlStateNormal];
+    [self styleButton:_cancelButton forPlacement:Trailing];
+
+    _stackView = [[UIStackView alloc] initWithArrangedSubviews:@[
+      _clearBrowsingDataButton, _editButton, _deleteButton, _cancelButton
+    ]];
+    _stackView.alignment = UIStackViewAlignmentFill;
+    _stackView.distribution = UIStackViewDistributionEqualSpacing;
+    _stackView.axis = UILayoutConstraintAxisHorizontal;
+
+    [self addSubview:_stackView];
+    _stackView.translatesAutoresizingMaskIntoConstraints = NO;
+    _stackView.layoutMarginsRelativeArrangement = YES;
+    [NSLayoutConstraint activateConstraints:@[
+      [_stackView.layoutMarginsGuide.leadingAnchor
+          constraintEqualToAnchor:self.leadingAnchor
+                         constant:kHorizontalMargin],
+      [_stackView.layoutMarginsGuide.trailingAnchor
+          constraintEqualToAnchor:self.trailingAnchor
+                         constant:-kHorizontalMargin],
+      [_stackView.topAnchor constraintEqualToAnchor:self.topAnchor],
+      [_stackView.bottomAnchor constraintEqualToAnchor:self.bottomAnchor],
+    ]];
+
+    [self setBackgroundColor:[UIColor whiteColor]];
+    [[self layer] setShadowOpacity:kShadowOpacity];
+    [self setEditing:NO];
+    propertyReleaser_ClearBrowsingBar_.Init(self, [ClearBrowsingBar class]);
+  }
+  return self;
+}
+
+#pragma mark Public Methods
+
+- (void)setEditing:(BOOL)editing {
+  _editing = editing;
+  self.clearBrowsingDataButton.hidden = editing;
+  self.editButton.hidden = editing;
+  self.deleteButton.hidden = !editing;
+  self.cancelButton.hidden = !editing;
+}
+
+- (BOOL)isEditButtonEnabled {
+  return self.editButton.enabled;
+}
+
+- (void)setEditButtonEnabled:(BOOL)editButtonEnabled {
+  self.editButton.enabled = editButtonEnabled;
+}
+
+- (BOOL)isDeleteButtonEnabled {
+  return self.deleteButton.enabled;
+}
+
+- (void)setDeleteButtonEnabled:(BOOL)deleteButtonEnabled {
+  self.deleteButton.enabled = deleteButtonEnabled;
+}
+
+- (void)setClearBrowsingDataTarget:(id)target action:(SEL)action {
+  [self.clearBrowsingDataButton addTarget:target
+                                   action:action
+                         forControlEvents:UIControlEventTouchUpInside];
+}
+
+- (void)setEditTarget:(id)target action:(SEL)action {
+  [self.editButton addTarget:target
+                      action:action
+            forControlEvents:UIControlEventTouchUpInside];
+}
+
+- (void)setDeleteTarget:(id)target action:(SEL)action {
+  [self.deleteButton addTarget:target
+                        action:action
+              forControlEvents:UIControlEventTouchUpInside];
+}
+
+- (void)setCancelTarget:(id)target action:(SEL)action {
+  [self.cancelButton addTarget:target
+                        action:action
+              forControlEvents:UIControlEventTouchUpInside];
+}
+
+#pragma mark Private Methods
+
+- (void)styleButton:(UIButton*)button forPlacement:(ButtonPlacement)placement {
+  BOOL leading = placement == Leading;
+  [button setBackgroundColor:[UIColor whiteColor]];
+  UIColor* textColor = leading ? [[MDCPalette redPalette] tint500]
+                               : [[MDCPalette bluePalette] tint500];
+  [button setTitleColor:textColor forState:UIControlStateNormal];
+  [button setTitleColor:[[MDCPalette greyPalette] tint500]
+               forState:UIControlStateDisabled];
+  [[button titleLabel]
+      setFont:[[MDCTypography fontLoader] regularFontOfSize:14]];
+  button.contentHorizontalAlignment =
+      leading ^ UseRTLLayout() ? UIControlContentHorizontalAlignmentLeft
+                               : UIControlContentHorizontalAlignmentRight;
+  [button setTranslatesAutoresizingMaskIntoConstraints:NO];
+}
+
+@end