[ios] Adds support for Find in Page to the new architecture.

ios/clean/chrome/browser/ui/find_in_page/find_in_page_view_controller.mm

Index: ios/clean/chrome/browser/ui/find_in_page/find_in_page_view_controller.mm
diff --git a/ios/clean/chrome/browser/ui/find_in_page/find_in_page_view_controller.mm b/ios/clean/chrome/browser/ui/find_in_page/find_in_page_view_controller.mm
new file mode 100644
index 0000000000000000000000000000000000000000..4ff81892910cc547618c2bb244a5545e9efe4fbf
--- /dev/null
+++ b/ios/clean/chrome/browser/ui/find_in_page/find_in_page_view_controller.mm
@@ -0,0 +1,110 @@
+// 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/find_in_page/find_in_page_view_controller.h"
+
+#include "base/format_macros.h"
+#include "base/strings/sys_string_conversions.h"
+#include "components/strings/grit/components_strings.h"
+#import "ios/chrome/browser/ui/find_bar/find_bar_view.h"
+#include "ui/base/l10n/l10n_util_mac.h"
+
+namespace {
+// For the first |kSearchDelayChars| characters, delay by |kSearchLongDelay|
+// For the remaining characters, delay by |kSearchShortDelay|.
+const NSUInteger kSearchDelayChars = 3;
+const NSTimeInterval kSearchLongDelay = 1.0;
+const NSTimeInterval kSearchShortDelay = 0.100;
+}  // namespace
+
+@interface FindInPageViewController ()
+// Redeclare the |view| property to be the FindBarView subclass instead of a

[marq (ping after 24h), 2017/04/06 16:13:27]

So for the omnibox, we have the view controller's view remain a UIView that acts
as a container for the omnibox text field. Here, we just have the FindBarView
directly as the view. Is one approach better than the other? 

(I prefer not to use spurious container views if we can avoid it).

[rohitrao (ping after 24h), 2017/04/06 16:27:07]

We should avoid spurious containers if we can.  The location bar view contains
only the textfield for now, but it will eventually have other children (star
button, voice search button, etc).  I may change that one to be a UIStackView,
actually.

[marq (ping after 24h), 2017/04/07 09:45:55]

Acknowledged.

+// generic UIView.
+@property(nonatomic, readwrite, strong) FindBarView* view;
+
+// Typing delay timer.
+@property(nonatomic, strong) NSTimer* delayTimer;
+@end
+
+@implementation FindInPageViewController
+
+@dynamic view;
+@synthesize delayTimer = _delayTimer;
+@synthesize dispatcher = _dispatcher;
+
+- (void)viewDidLoad {
+  FindBarView* findBarView = [[FindBarView alloc] initWithDarkAppearance:NO];
+  findBarView.backgroundColor = [UIColor whiteColor];
+  [findBarView.inputField addTarget:self
+                             action:@selector(findBarTextDidChange)
+                   forControlEvents:UIControlEventEditingChanged];
+  [findBarView.nextButton addTarget:self
+                             action:@selector(findNextInPage)
+                   forControlEvents:UIControlEventTouchUpInside];
+  [findBarView.previousButton addTarget:self
+                                 action:@selector(findPreviousInPage)
+                       forControlEvents:UIControlEventTouchUpInside];
+  [findBarView.closeButton addTarget:self
+                              action:@selector(hideFindInPage)
+                    forControlEvents:UIControlEventTouchUpInside];
+  self.view = findBarView;
+
+  [NSLayoutConstraint activateConstraints:[self subviewConstraints]];
+}
+
+- (NSArray*)subviewConstraints {
+  return @[];
+}
+
+- (void)setCurrentMatch:(NSUInteger)current ofTotalMatches:(NSUInteger)total {
+  NSString* indexStr = [NSString stringWithFormat:@"%" PRIdNS, current];
+  NSString* matchesStr = [NSString stringWithFormat:@"%" PRIdNS, total];
+  NSString* text = l10n_util::GetNSStringF(
+      IDS_FIND_IN_PAGE_COUNT, base::SysNSStringToUTF16(indexStr),
+      base::SysNSStringToUTF16(matchesStr));
+  [static_cast<FindBarView*>(self.view) updateResultsLabelWithText:text];
+}
+
+- (void)textChanged {
+  [self.dispatcher findStringInPage:self.view.inputField.text];
+}
+
+#pragma mark - Actions
+
+- (void)showFindInPage {
+  NOTREACHED();
+  [self.dispatcher showFindInPage];
+}
+
+- (void)findNextInPage {
+  [self.dispatcher findNextInPage];
+}
+
+- (void)findPreviousInPage {
+  [self.dispatcher findPreviousInPage];
+}
+
+- (void)hideFindInPage {
+  [self.dispatcher hideFindInPage];
+}
+
+- (void)findBarTextDidChange {
+  [self.delayTimer invalidate];
+  NSUInteger length = [self.view.inputField.text length];
+  if (length == 0)
+    return [self textChanged];
+
+  // Delay delivery of text change event.  Use a longer delay when the input
+  // length is short.
+  NSTimeInterval delay =
+      (length > kSearchDelayChars) ? kSearchShortDelay : kSearchLongDelay;
+  self.delayTimer =
+      [NSTimer scheduledTimerWithTimeInterval:delay
+                                       target:self
+                                     selector:@selector(textChanged)
+                                     userInfo:nil
+                                      repeats:NO];
+}
+
+@end