Upstream ios/web/web_state/ui support classes

ios/web/web_state/ui/crw_ui_simple_web_view_controller.mm

+// Copyright 2014 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/web/web_state/ui/crw_ui_simple_web_view_controller.h"
+
+#include "base/ios/weak_nsobject.h"
+#import "base/logging.h"
+#import "base/mac/scoped_nsobject.h"
+
+@interface CRWUISimpleWebViewController () <UIWebViewDelegate>
+@end
+
+@implementation CRWUISimpleWebViewController {
+  base::scoped_nsobject<UIWebView> _webView;
+  base::WeakNSProtocol<id<CRWSimpleWebViewControllerDelegate>> _delegate;
+}
+
+- (instancetype)initWithUIWebView:(UIWebView*)webView {
+  self = [super init];
+  if (self) {
+    DCHECK(webView);
+    _webView.reset([webView retain]);
+    [_webView setDelegate:self];
+  }
+  return self;
+}
+
+- (void)dealloc {
+  [_webView setDelegate:nil];
+  [super dealloc];
+}
+
+#pragma mark -
+#pragma mark CRWSimpleWebView implementation
+
+- (void)reload {
+  [_webView reload];
+}
+
+- (UIView*)view {
+  return _webView.get();
+}
+
+- (UIScrollView*)scrollView {
+  return [_webView scrollView];
+}
+
+- (NSString*)title {
+  return [_webView stringByEvaluatingJavaScriptFromString:@"document.title"];
+}
+
+- (void)loadRequest:(NSURLRequest*)request {
+  [_webView loadRequest:request];
+}
+
+- (void)loadHTMLString:(NSString*)html baseURL:(NSURL*)baseURL {
+  [_webView loadHTMLString:html baseURL:baseURL];
+}
+
+- (void)setDelegate:(id<CRWSimpleWebViewControllerDelegate>)delegate {
+  _delegate.reset(delegate);
+}
+
+- (id<CRWSimpleWebViewControllerDelegate>)delegate {
+  return _delegate.get();
+}
+
+- (void)loadPDFAtFilePath:(NSString*)filePath {
+  DCHECK([[NSFileManager defaultManager] fileExistsAtPath:filePath]);
+  NSData* data = [NSData dataWithContentsOfFile:filePath];
+  [_webView loadData:data
+              MIMEType:@"application/pdf"
+      textEncodingName:@"utf-8"
+               baseURL:nil];
+}
+
+- (void)evaluateJavaScript:(NSString*)script
+       stringResultHandler:(web::JavaScriptCompletion)handler {
+  web::EvaluateJavaScript(_webView, script, handler);
+}
+
+#pragma mark -
+#pragma mark UIWebViewDelegateMethods
+
+- (BOOL)webView:(UIWebView*)webView
+    shouldStartLoadWithRequest:(NSURLRequest*)request
+                navigationType:(UIWebViewNavigationType)navigationType {
+  if ([_delegate respondsToSelector:@selector(simpleWebViewController:
+                                           shouldStartLoadWithRequest:)]) {
+    return [_delegate simpleWebViewController:self
+                   shouldStartLoadWithRequest:request];
+  }
+  // By default all loads are allowed.
+  return YES;
+}
+
+- (void)webViewDidFinishLoad:(UIWebView*)webView {
+  if (![_delegate respondsToSelector:@selector(simpleWebViewController:
+                                                   titleMayHaveChanged:)]) {
+    return;
+  }
+  [_delegate simpleWebViewController:self titleMayHaveChanged:self.title];
+}
+
+@end