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// 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.
#ifndef CHROME_BROWSER_UI_TAB_HELPERS_H_
#define CHROME_BROWSER_UI_TAB_HELPERS_H_
namespace android {
class TabWebContentsDelegateAndroid;
}
namespace content {
class WebContents;
}
namespace chrome {
class BrowserTabStripModelDelegate;
}
namespace prerender {
class PrerenderContents;
}
// A "tab contents" is a WebContents that is used as a tab in a browser window
// (or the equivalent on Android). The TabHelpers class allows specific classes
// to attach the set of tab helpers that is used for tab contents.
//
// https://chromium.googlesource.com/chromium/src/+/master/docs/tab_helpers.md
//
// TODO(avi): This list is rather large, and for most callers it's due to the
// fact that they need tab helpers attached early to deal with arbitrary
// content loaded into a WebContents that will later be added to the tabstrip.
// Is there a better way to handle this? (Ideally, this list would contain
// only Browser and BrowserTabStripModelDelegate.)
class TabHelpers {
private:
// Browser and its TabStripModelDelegate have intimate control of tabs.
// TabAndroid is the equivalent on Android.
friend class Browser;
friend class chrome::BrowserTabStripModelDelegate;
// These are the Android equivalents of the two classes above.
friend class TabAndroid;
friend class android::TabWebContentsDelegateAndroid;
// chrome::Navigate creates WebContents that are destined for the tab strip,
// and that might have WebUI that immediately calls back into random tab
// helpers.
friend class BrowserNavigatorWebContentsAdoption;
// Prerendering loads pages that have arbitrary external content; it needs
// the full set of tab helpers to deal with it.
friend class prerender::PrerenderContents;
// FYI: Do NOT add any more friends here. The functions above are the ONLY
// ones that need to call AttachTabHelpers; if you think you do, re-read the
// design document linked above, especially the section "Reusing tab helpers".
// Adopts the specified WebContents as a full-fledged browser tab, attaching
// all the associated tab helpers that are needed for the WebContents to
// serve in that role. It is safe to call this on a WebContents that was
// already adopted.
static void AttachTabHelpers(content::WebContents* web_contents);
};
#endif // CHROME_BROWSER_UI_TAB_HELPERS_H_
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