Upstream Chrome on iOS source code [8/11].

ios/chrome/browser/ui/stack_view/stack_card.mm

+// Copyright 2012 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/stack_view/stack_card.h"
+
+#include "base/logging.h"
+#import "base/mac/scoped_nsobject.h"
+#import "ios/chrome/browser/ui/rtl_geometry.h"
+#import "ios/chrome/browser/ui/stack_view/card_view.h"
+#import "ios/chrome/browser/ui/ui_util.h"
+
+@interface StackCard () {
+  id<StackCardViewProvider> _viewProvider;
+  base::scoped_nsobject<CardView> _view;
+}
+
+// The pixel-aligned frame generated by applying |self.layout| under the current
+// language direction.
+@property(nonatomic, readonly) CGRect frame;
+
+// Applies |self.layout| to the underlying CardView if it exists.
+- (void)applyLayout;
+
+@end
+
+@implementation StackCard
+
+@synthesize layout = _layout;
+@synthesize synchronizeView = _synchronizeView;
+@synthesize isActiveTab = _isActiveTab;
+@synthesize tabID = _tabID;
+
+- (instancetype)initWithViewProvider:(id<StackCardViewProvider>)viewProvider {
+  if ((self = [super init])) {
+    DCHECK(viewProvider);
+    _viewProvider = viewProvider;
+    _synchronizeView = YES;
+  }
+  return self;
+}
+
+- (instancetype)init {
+  NOTREACHED();
+  return nil;
+}
+
+- (void)releaseView {
+  if (self.viewIsLive)
+    _view.reset();
+}
+
+#pragma mark - Properties
+
+- (CardView*)view {
+  if (!_view) {
+    _view.reset([[_viewProvider cardViewWithFrame:self.frame forStackCard:self]
+        retain]);
+    _view.get().isActiveTab = _isActiveTab;
+  }
+  return _view.get();
+}
+
+- (void)setLayout:(LayoutRect)layout {
+  if (!LayoutRectEqualToRect(_layout, layout)) {
+    _layout = layout;
+    [self applyLayout];
+  }
+}
+
+- (CGSize)size {
+  return self.layout.size;
+}
+
+- (void)setSize:(CGSize)size {
+  CGSize oldSize = self.size;
+  if (!CGSizeEqualToSize(oldSize, size)) {
+    _layout.size = size;
+    _layout.position.leading += (oldSize.width - size.width) / 2.0;
+    _layout.position.originY += (oldSize.height - size.height) / 2.0;
+    [self applyLayout];
+  }
+}
+
+- (void)setSynchronizeView:(BOOL)synchronizeView {
+  if (_synchronizeView != synchronizeView) {
+    _synchronizeView = synchronizeView;
+    [self applyLayout];
+  }
+}
+
+- (void)setIsActiveTab:(BOOL)isActiveTab {
+  _isActiveTab = isActiveTab;
+  _view.get().isActiveTab = _isActiveTab;
+}
+
+- (BOOL)viewIsLive {
+  return _view != nil;
+}
+
+- (CGRect)frame {
+  return AlignRectOriginAndSizeToPixels(LayoutRectGetRect(self.layout));
+}
+
+#pragma mark -
+
+- (void)applyLayout {
+  if (!self.viewIsLive || !self.synchronizeView)
+    return;
+  self.view.frame = self.frame;
+}
+
+@end