blob: 202e588607a07b90e64af857659c33da5191991c [file] [log] [blame]
// Copyright 2018 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.
#ifndef IOS_CHROME_BROWSER_WEB_FONT_SIZE_TAB_HELPER_H_
#define IOS_CHROME_BROWSER_WEB_FONT_SIZE_TAB_HELPER_H_
#include "base/macros.h"
#import "ios/web/public/web_state/web_state_observer.h"
#import "ios/web/public/web_state/web_state_user_data.h"
namespace web {
class WebState;
} // namespace web
// Adjusts font size of web page by mapping
// |UIApplication.sharedApplication.preferredContentSizeCategory| to a scaling
// percentage and setting it to "-webkit-font-size-adjust" style on <body> when
// the page is successfully loaded or system font size changes.
class FontSizeTabHelper : public web::WebStateObserver,
public web::WebStateUserData<FontSizeTabHelper> {
public:
~FontSizeTabHelper() override;
private:
friend class web::WebStateUserData<FontSizeTabHelper>;
explicit FontSizeTabHelper(web::WebState* web_state);
// Sets font size in web page by scaling percentage.
void SetPageFontSize(int size);
// Returns system suggested font size in scaling percentage(e.g. 150 for
// 150%).
int GetSystemSuggestedFontSize() const;
// web::WebStateObserver overrides:
void PageLoaded(
web::WebState* web_state,
web::PageLoadCompletionStatus load_completion_status) override;
void WebStateDestroyed(web::WebState* web_state) override;
// Observer id returned by registering at NSNotificationCenter.
id content_size_did_change_observer_ = nil;
// WebState this tab helper is attached to.
web::WebState* web_state_ = nullptr;
DISALLOW_COPY_AND_ASSIGN(FontSizeTabHelper);
};
#endif // IOS_CHROME_BROWSER_WEB_FONT_SIZE_TAB_HELPER_H_