Instant: Use only one hidden WebContents per profile.

chrome/browser/ui/views/frame/instant_preview_controller_views.cc

-// Copyright 2012 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.
-
-#include "chrome/browser/ui/views/frame/instant_preview_controller_views.h"
-
-#include "chrome/browser/instant/instant_model.h"
-#include "chrome/browser/profiles/profile.h"
-#include "chrome/browser/ui/browser.h"
-#include "chrome/browser/ui/view_ids.h"
-#include "chrome/browser/ui/views/frame/browser_view.h"
-#include "chrome/browser/ui/views/frame/contents_container.h"
-#include "chrome/browser/ui/views/infobars/infobar_container_view.h"
-#include "ui/views/controls/webview/webview.h"
-
-InstantPreviewControllerViews::InstantPreviewControllerViews(
-    Browser* browser,
-    ContentsContainer* contents)
-    : InstantPreviewController(browser),
-      contents_(contents) {
-}
-
-InstantPreviewControllerViews::~InstantPreviewControllerViews() {
-}
-
-void InstantPreviewControllerViews::PreviewStateChanged(
-    const InstantModel& model) {
-  if (model.mode().is_ntp() || model.mode().is_search_suggestions()) {
-    // Show the preview.
-    if (!preview_) {
-      preview_.reset(new views::WebView(browser_->profile()));
-      preview_->set_id(VIEW_ID_TAB_CONTAINER);
-    }
-    // Drop shadow is only needed if search mode is not |NTP| and preview does
-    // not fill up the entire contents page.
-    bool draw_drop_shadow = !model.mode().is_ntp() &&
-        !(contents_->IsPreviewFullHeight(model.height(), model.height_units()));
-    content::WebContents* web_contents = model.GetPreviewContents();
-    contents_->SetPreview(preview_.get(), web_contents, model.mode(),
-                          model.height(), model.height_units(),
-                          draw_drop_shadow);
-    preview_->SetWebContents(web_contents);
-  } else if (preview_) {
-    // Hide the preview. SetWebContents() must happen before SetPreview().
-    preview_->SetWebContents(NULL);
-    contents_->SetPreview(NULL, NULL, model.mode(), 100, INSTANT_SIZE_PERCENT,
-                          false);
-    preview_.reset();
-  }
-
-  browser_->MaybeUpdateBookmarkBarStateForInstantPreview(model.mode());
-
-  // If an instant preview is added during an immersive mode reveal, the reveal
-  // view needs to stay on top.
-  // Notify infobar container of change in preview state.
-  if (preview_) {
-    BrowserView* browser_view = BrowserView::GetBrowserViewForBrowser(browser_);
-    if (browser_view) {
-      browser_view->MaybeStackImmersiveRevealAtTop();
-      browser_view->infobar_container()->PreviewStateChanged(model);
-    }
-  }
-}