Add centering, cropping, and constraint setup methods to uikit_ui_util.

BUG=None.

Review URL: https://codereview.chromium.org/1079933002

Cr-Commit-Position: refs/heads/master@{#326550}

2 files changed, 45 insertions, 3 deletions

diff --git a/ios/chrome/browser/ui/uikit_ui_util.h b/ios/chrome/browser/ui/uikit_ui_util.h
index 37aa0d3..052fbff 100644
--- a/ios/chrome/browser/ui/uikit_ui_util.h
+++ b/ios/chrome/browser/ui/uikit_ui_util.h
@@ -101,6 +101,9 @@ UIImage* BlurImage(UIImage* image,
                    CGFloat saturationDeltaFactor,
                    UIImage* maskImage);
 
+// Returns a cropped image using |cropRect| on |image|.
+UIImage* CropImage(UIImage* image, const CGRect& cropRect);
+
 // Returns the interface orientation of the app.
 UIInterfaceOrientation GetInterfaceOrientation();
 
@@ -127,14 +130,26 @@ void ApplyVisualConstraints(NSArray* constraints,
                             NSDictionary* subviewsDictionary,
                             UIView* parentView);
 
+// Applies all |constraints| with |metrics| to all views in |subviewsDictionary|
+// in the superview |parentView|
+void ApplyVisualConstraintsWithMetrics(NSArray* constraints,
+                                       NSDictionary* subviewsDictionary,
+                                       NSDictionary* metrics,
+                                       UIView* parentView);
+
 // Adds a constraint that |subview| is center aligned horizontally in
 // |parentView|.
-// |subview| must be a subiew of |parentView|.
+// |subview| must be a subview of |parentView|.
 void AddSameCenterXConstraint(UIView* parentView, UIView* subview);
 
+// Adds a constraint that |subview| is center aligned vertically in
+// |parentView|.
+// |subview| must be a subview of |parentView|.
+void AddSameCenterYConstraint(UIView* parentView, UIView* subview);
+
 // Adds a constraint that |subview1| and |subview2| are center aligned
 // vertically on |parentView|.
-// |subview1| and |subview2| must be subiews of |parentView|.
+// |subview1| and |subview2| must be subview of |parentView|.
 void AddSameCenterYConstraint(UIView* parentView,
                               UIView* subview1,
                               UIView* subview2);
diff --git a/ios/chrome/browser/ui/uikit_ui_util.mm b/ios/chrome/browser/ui/uikit_ui_util.mm
index 5810da0..8d301aa 100644
--- a/ios/chrome/browser/ui/uikit_ui_util.mm
+++ b/ios/chrome/browser/ui/uikit_ui_util.mm
@@ -353,6 +353,13 @@ UIImage* BlurImage(UIImage* image,
   return outputImage;
 }
 
+UIImage* CropImage(UIImage* image, const CGRect& cropRect) {
+  CGImageRef cgImage = CGImageCreateWithImageInRect([image CGImage], cropRect);
+  UIImage* result = [UIImage imageWithCGImage:cgImage];
+  CGImageRelease(cgImage);
+  return result;
+}
+
 UIInterfaceOrientation GetInterfaceOrientation() {
   return [[UIApplication sharedApplication] statusBarOrientation];
 }
@@ -419,13 +426,21 @@ UIColor* InterpolateFromColorToColor(UIColor* firstColor,
 void ApplyVisualConstraints(NSArray* constraints,
                             NSDictionary* subviewsDictionary,
                             UIView* parentView) {
+  ApplyVisualConstraintsWithMetrics(constraints, subviewsDictionary, nil,
+                                    parentView);
+}
+
+void ApplyVisualConstraintsWithMetrics(NSArray* constraints,
+                                       NSDictionary* subviewsDictionary,
+                                       NSDictionary* metrics,
+                                       UIView* parentView) {
   for (NSString* constraint in constraints) {
     DCHECK([constraint isKindOfClass:[NSString class]]);
     [parentView
         addConstraints:[NSLayoutConstraint
                            constraintsWithVisualFormat:constraint
                                                options:0
-                                               metrics:nil
+                                               metrics:metrics
                                                  views:subviewsDictionary]];
   }
 }
@@ -442,6 +457,18 @@ void AddSameCenterXConstraint(UIView* parentView, UIView* subview) {
                                           constant:0]];
 }
 
+void AddSameCenterYConstraint(UIView* parentView, UIView* subview) {
+  DCHECK_EQ(parentView, [subview superview]);
+  [parentView addConstraint:[NSLayoutConstraint
+                                constraintWithItem:subview
+                                         attribute:NSLayoutAttributeCenterY
+                                         relatedBy:NSLayoutRelationEqual
+                                            toItem:parentView
+                                         attribute:NSLayoutAttributeCenterY
+                                        multiplier:1
+                                          constant:0]];
+}
+
 void AddSameCenterYConstraint(UIView* parentView,
                               UIView* subview1,
                               UIView* subview2) {