ios/chrome/browser/autofill/form_suggestion_view.mm

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #import "ios/chrome/browser/autofill/form_suggestion_view.h"
   6
   7 #include "base/i18n/rtl.h"
   8 #include "base/mac/scoped_nsobject.h"
   9 #import "ios/chrome/browser/autofill/form_suggestion_label.h"
  10 #import "ios/chrome/browser/autofill/form_suggestion_view_client.h"
  11
  12 namespace {
  13
  14 // Vertical margin between suggestions and the edge of the suggestion content
  15 // frame.
  16 const CGFloat kSuggestionVerticalMargin = 4;
  17
  18 // Horizontal margin around suggestions (i.e. between suggestions, and between
  19 // the end suggestions and the suggestion content frame).
  20 const CGFloat kSuggestionHorizontalMargin = 2;
  21
  22 }  // namespace
  23
  24 @implementation FormSuggestionView {
  25   // The FormSuggestions that are displayed by this view.
  26   base::scoped_nsobject<NSArray> _suggestions;
  27 }
  28
  29 - (instancetype)initWithFrame:(CGRect)frame
  30                        client:(id<FormSuggestionViewClient>)client
  31                   suggestions:(NSArray*)suggestions {
  32   self = [super initWithFrame:frame];
  33   if (self) {
  34     _suggestions.reset([suggestions copy]);
  35
  36     self.showsVerticalScrollIndicator = NO;
  37     self.showsHorizontalScrollIndicator = NO;
  38     self.bounces = NO;
  39     self.canCancelContentTouches = YES;
  40
  41     // Total height occupied by the label content, padding, border and margin.
  42     const CGFloat labelHeight =
  43         CGRectGetHeight(frame) - kSuggestionVerticalMargin * 2;
  44
  45     BOOL isRTL = base::i18n::IsRTL();
  46
  47     NSUInteger suggestionCount = [_suggestions count];
  48     // References to labels. These references are used to adjust the labels'
  49     // positions if they don't take up the whole suggestion view area for RTL.
  50     base::scoped_nsobject<NSMutableArray> labels(
  51         [[NSMutableArray alloc] initWithCapacity:suggestionCount]);
  52     __block CGFloat currentX = kSuggestionHorizontalMargin;
  53     void (^setupBlock)(FormSuggestion* suggestion, NSUInteger idx, BOOL* stop) =
  54         ^(FormSuggestion* suggestion, NSUInteger idx, BOOL* stop) {
  55           // FormSuggestionLabel will adjust the width, so here 0 is used for
  56           // the width.
  57           CGRect proposedFrame =
  58               CGRectMake(currentX, kSuggestionVerticalMargin, 0, labelHeight);
  59           base::scoped_nsobject<UIView> label(
  60               [[FormSuggestionLabel alloc] initWithSuggestion:suggestion
  61                                                 proposedFrame:proposedFrame
  62                                                        client:client]);
  63           [self addSubview:label];
  64           [labels addObject:label];
  65           currentX +=
  66               CGRectGetWidth([label frame]) + kSuggestionHorizontalMargin;
  67         };
  68     [_suggestions enumerateObjectsWithOptions:(isRTL ? NSEnumerationReverse : 0)
  69                                    usingBlock:setupBlock];
  70
  71     if (isRTL) {
  72       if (currentX < CGRectGetWidth(frame)) {
  73         self.contentSize = frame.size;
  74         // Offsets labels for right alignment.
  75         CGFloat offset = CGRectGetWidth(frame) - currentX;
  76         for (UIView* label in labels.get()) {
  77           label.frame = CGRectOffset(label.frame, offset, 0);
  78         }
  79       } else {
  80         self.contentSize = CGSizeMake(currentX, CGRectGetHeight(frame));
  81         // Sets the visible rectangle so suggestions at the right end are
  82         // initially visible.
  83         CGRect initRect = {{currentX - CGRectGetWidth(frame), 0}, frame.size};
  84         [self scrollRectToVisible:initRect animated:NO];
  85       }
  86     } else {
  87       self.contentSize = CGSizeMake(currentX, CGRectGetHeight(frame));
  88     }
  89   }
  90   return self;
  91 }
  92
  93 - (NSArray*)suggestions {
  94   return _suggestions.get();
  95 }
  96
  97 @end