Add iPadOS pointer support to NTP tiles.

Add pointer support to the mostVisited and shortcut buttons
on the NTP.

BUG=1139054

Change-Id: I9486aca3c27871312df0051149f8ed1e6f1dea22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2476957
Auto-Submit: Mike Pinkerton <pinkerton@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Mike Pinkerton <pinkerton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820328}

ios/chrome/browser/ui/ntp_tile_views/BUILD.gn

@@ -22,6 +22,7 @@ source_set("ntp_tile_views") {
     "resources:ntp_readinglist_icon",
     "resources:ntp_recent_icon",
     "//base",
+    "//ios/chrome/browser/ui:feature_flags",
     "//ios/chrome/browser/ui/util",
     "//ios/chrome/common/ui/colors",
     "//ios/chrome/common/ui/favicon",

ios/chrome/browser/ui/ntp_tile_views/ntp_tile_view.h

@@ -10,7 +10,11 @@
 // A generic NTP tile view. Provides a title label and an image container on a
 // squircle-shaped background. Concrete subclasses of this are used to display
 // most visited tiles and shortcut tiles on NTP and other places.
+#ifdef __IPHONE_13_4
+@interface NTPTileView : UIView <UIPointerInteractionDelegate>
+#else
 @interface NTPTileView : UIView
+#endif
 
 // Container for the image view. Used in subclasses.
 @property(nonatomic, strong, readonly, nonnull) UIView* imageContainerView;

ios/chrome/browser/ui/ntp_tile_views/ntp_tile_view.mm

@@ -4,6 +4,8 @@
 
 #import "ios/chrome/browser/ui/ntp_tile_views/ntp_tile_view.h"
 
+#include "base/feature_list.h"
+#include "ios/chrome/browser/ui/ui_feature_flags.h"
 #import "ios/chrome/browser/ui/util/dynamic_type_util.h"
 #import "ios/chrome/common/ui/colors/UIColor+cr_semantic_colors.h"
 #import "ios/chrome/common/ui/colors/semantic_color_names.h"
@@ -68,6 +70,15 @@ const CGFloat kPreferredMaxWidth = 73;
         @{ @"space" : @(kSpaceIconTitle) });
 
     _imageBackgroundView = backgroundView;
+
+#ifdef __IPHONE_13_4
+    if (@available(iOS 13.4, *)) {
+      if (base::FeatureList::IsEnabled(kPointerSupport)) {
+        [self addInteraction:[[UIPointerInteraction alloc]
+                                 initWithDelegate:self]];
+      }
+    }
+#endif
   }
   return self;
 }
@@ -90,4 +101,30 @@ const CGFloat kPreferredMaxWidth = 73;
   }
 }
 
+#pragma mark - UIPointerInteractionDelegate
+
+#ifdef __IPHONE_13_4
+
+- (UIPointerRegion*)pointerInteraction:(UIPointerInteraction*)interaction
+                      regionForRequest:(UIPointerRegionRequest*)request
+                         defaultRegion:(UIPointerRegion*)defaultRegion
+    API_AVAILABLE(ios(13.4)) {
+  return defaultRegion;
+}
+
+- (UIPointerStyle*)pointerInteraction:(UIPointerInteraction*)interaction
+                       styleForRegion:(UIPointerRegion*)region
+    API_AVAILABLE(ios(13.4)) {
+  UITargetedPreview* preview =
+      [[UITargetedPreview alloc] initWithView:_imageContainerView];
+  UIPointerHighlightEffect* effect =
+      [UIPointerHighlightEffect effectWithPreview:preview];
+  UIPointerShape* shape =
+      [UIPointerShape shapeWithRoundedRect:_imageContainerView.frame
+                              cornerRadius:8.0];
+  return [UIPointerStyle styleWithEffect:effect shape:shape];
+}
+
+#endif
+
 @end