Move frame-related methods out of GoogleLandingViewController

ios/chrome/browser/ui/content_suggestions/content_suggestions_collection_utils.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/content_suggestions/content_suggestions_collection_utils.h"
+
+#include "base/logging.h"
+#import "ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_most_visited_item.h"
+#include "ios/chrome/browser/ui/ui_util.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+namespace {
+const CGFloat kSpacingIPhone = 16;
+const CGFloat kSpacingIPad = 24;
+
+const CGFloat kMaxSearchFieldFrameMargin = 200;
+const CGFloat kDoodleTopMarginIPadPortrait = 82;
+const CGFloat kDoodleTopMarginIPadLandscape = 82;
+const CGFloat kNTPSearchFieldBottomPadding = 16;
+
+// Height for the doodle frame when Google is not the default search engine.
+const CGFloat kNonGoogleSearchDoodleHeight = 60;
+// Height for the header view on tablet when Google is not the default search
+// engine.
+const CGFloat kNonGoogleSearchHeaderHeightIPad = 10;
+
+enum InterfaceOrientation {
+  ALL = 0,
+  IPHONE_LANDSCAPE = 1,
+};
+
+// Returns the width necessary to fit |numberOfItem| items, with no padding on
+// the side.
+CGFloat widthForNumberOfItem(NSUInteger numberOfItem) {
+  return (numberOfItem - 1) * content_suggestions::spacingBetweenTiles() +
+         numberOfItem * [ContentSuggestionsMostVisitedCell defaultSize].width;
+}
+}
+
+namespace content_suggestions {
+
+NSUInteger numberOfTilesForWidth(CGFloat availableWidth) {
+  if (availableWidth > widthForNumberOfItem(4))
+    return 4;
+  if (availableWidth > widthForNumberOfItem(3))
+    return 3;
+  if (availableWidth > widthForNumberOfItem(2))
+    return 2;
+
+  return 1;
+}
+
+CGFloat spacingBetweenTiles() {
+  return IsIPadIdiom() ? kSpacingIPad : kSpacingIPhone;
+}
+
+CGRect getOrientationFrame(const CGRect frames[], CGFloat width) {
+  BOOL is_portrait = UIInterfaceOrientationIsPortrait(
+      [[UIApplication sharedApplication] statusBarOrientation]);
+  InterfaceOrientation orientation =
+      (IsIPadIdiom() || is_portrait) ? ALL : IPHONE_LANDSCAPE;
+
+  // Calculate width based on screen width and origin x.
+  CGRect frame = frames[orientation];
+  frame.size.width = fmax(width - 2 * frame.origin.x, 50);
+  return frame;
+}
+
+CGFloat centeredTilesMarginForWidth(CGFloat width) {
+  NSUInteger columns = numberOfTilesForWidth(width - 2 * spacingBetweenTiles());
+  CGFloat whitespace =
+      width - columns * [ContentSuggestionsMostVisitedCell defaultSize].width -
+      (columns - 1) * spacingBetweenTiles();
+  CGFloat margin = AlignValueToPixel(whitespace / 2);
+  DCHECK(margin >= spacingBetweenTiles());
+  return margin;
+}
+
+CGRect doodleFrame(CGFloat width, BOOL logoIsShowing) {
+  const CGRect kDoodleFrame[2] = {
+      CGRectMake(0, 66, 0, 120), CGRectMake(0, 56, 0, 120),
+  };
+  CGRect doodleFrame = getOrientationFrame(kDoodleFrame, width);
+  if (!IsIPadIdiom() && !logoIsShowing)
+    doodleFrame.size.height = kNonGoogleSearchDoodleHeight;
+  if (IsIPadIdiom()) {
+    doodleFrame.origin.y = IsPortrait() ? kDoodleTopMarginIPadPortrait
+                                        : kDoodleTopMarginIPadLandscape;
+  }
+  return doodleFrame;
+}
+
+CGRect searchFieldFrame(CGFloat width, BOOL logoIsShowing) {
+  CGFloat y = CGRectGetMaxY(doodleFrame(width, logoIsShowing));
+  CGFloat margin = centeredTilesMarginForWidth(width);
+  if (margin > kMaxSearchFieldFrameMargin)
+    margin = kMaxSearchFieldFrameMargin;
+  const CGRect kSearchFieldFrame[2] = {
+      CGRectMake(margin, y + 32, 0, 50), CGRectMake(margin, y + 16, 0, 50),
+  };
+  CGRect searchFieldFrame = getOrientationFrame(kSearchFieldFrame, width);
+  if (IsIPadIdiom()) {
+    CGFloat iPadTopMargin = IsPortrait() ? kDoodleTopMarginIPadPortrait
+                                         : kDoodleTopMarginIPadLandscape;
+    searchFieldFrame.origin.y += iPadTopMargin - 32;
+  }
+  return searchFieldFrame;
+}
+
+CGFloat heightForLogoHeader(CGFloat width,
+                            BOOL logoIsShowing,
+                            BOOL promoCanShow) {
+  CGFloat headerHeight = CGRectGetMaxY(searchFieldFrame(width, logoIsShowing)) +
+                         kNTPSearchFieldBottomPadding;
+  if (!IsIPadIdiom()) {
+    return headerHeight;
+  }
+  if (!logoIsShowing) {
+    return kNonGoogleSearchHeaderHeightIPad;
+  }
+  if (!promoCanShow) {
+    UIInterfaceOrientation orient =
+        [[UIApplication sharedApplication] statusBarOrientation];
+    const CGFloat kTopSpacingMaterialPortrait = 56;
+    const CGFloat kTopSpacingMaterialLandscape = 32;
+    headerHeight += UIInterfaceOrientationIsPortrait(orient)
+                        ? kTopSpacingMaterialPortrait
+                        : kTopSpacingMaterialLandscape;
+  }
+
+  return headerHeight;
+}
+
+}  // namespace content_suggestions