Index: ios/clean/chrome/browser/ui/tab_grid/tab_grid_collection_view_layout.mm |
diff --git a/ios/clean/chrome/browser/ui/tab_grid/tab_grid_collection_view_layout.mm b/ios/clean/chrome/browser/ui/tab_grid/tab_grid_collection_view_layout.mm |
new file mode 100644 |
index 0000000000000000000000000000000000000000..3810646144ee3e1047b5ba7e3299c2f504c9f1f8 |
--- /dev/null |
+++ b/ios/clean/chrome/browser/ui/tab_grid/tab_grid_collection_view_layout.mm |
@@ -0,0 +1,46 @@ |
+// 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/clean/chrome/browser/ui/tab_grid/tab_grid_collection_view_layout.h" |
+ |
+#if !defined(__has_feature) || !__has_feature(objc_arc) |
+#error "This file requires ARC support." |
+#endif |
+ |
+namespace { |
+const CGFloat kMinTabWidth = 200.0f; |
+const CGFloat kMaxTabWidth = 250.0f; |
+const CGFloat kInterTabSpacing = 20.0f; |
+const UIEdgeInsets kSectionInset = {20.0f, 20.0f, 20.0f, 20.0f}; |
+} |
+ |
+@implementation TabGridCollectionViewLayout |
+ |
+#pragma mark - UICollectionViewLayout |
+ |
+// This is called whenever the layout is invalidated, including during rotation. |
+- (void)prepareLayout { |
+ [super prepareLayout]; |
+ [self updateLayoutWithBounds:[[self collectionView] bounds].size]; |
+} |
+ |
+#pragma mark - Private |
+ |
+// This sets the appropriate itemSize given the bounds of the collection view. |
+- (void)updateLayoutWithBounds:(CGSize)boundsSize { |
+ int columns = static_cast<int>(floor(boundsSize.width - kInterTabSpacing) / |
+ (kMinTabWidth + kInterTabSpacing)); |
+ CGFloat tabWidth = |
+ (boundsSize.width - kInterTabSpacing * (columns + 1)) / columns; |
+ while (columns < 2 || tabWidth > kMaxTabWidth) { |
+ columns++; |
+ tabWidth = (boundsSize.width - kInterTabSpacing * (columns + 1)) / columns; |
+ } |
+ self.itemSize = CGSizeMake(tabWidth, tabWidth); |
+ self.sectionInset = kSectionInset; |
+ self.minimumLineSpacing = kInterTabSpacing; |
+ self.minimumInteritemSpacing = kInterTabSpacing; |
+} |
+ |
+@end |