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// Copyright (c) 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/tabs/tab_strip_model_order_controller.h"
#include "content/public/browser/web_contents.h"
///////////////////////////////////////////////////////////////////////////////
// TabStripModelOrderController, public:
TabStripModelOrderController::TabStripModelOrderController(
TabStripModel* tabstrip)
: tabstrip_(tabstrip) {
tabstrip_->AddObserver(this);
}
TabStripModelOrderController::~TabStripModelOrderController() {
tabstrip_->RemoveObserver(this);
}
int TabStripModelOrderController::DetermineInsertionIndex(
ui::PageTransition transition,
bool foreground) {
int tab_count = tabstrip_->count();
if (!tab_count)
return 0;
// NOTE: TabStripModel enforces that all non-mini-tabs occur after mini-tabs,
// so we don't have to check here too.
if (transition == ui::PAGE_TRANSITION_LINK &&
tabstrip_->active_index() != -1) {
if (foreground) {
// If the page was opened in the foreground by a link click in another
// tab, insert it adjacent to the tab that opened that link.
return tabstrip_->active_index() + 1;
}
content::WebContents* opener = tabstrip_->GetActiveWebContents();
// Get the index of the next item opened by this tab, and insert after
// it...
int index = tabstrip_->GetIndexOfLastWebContentsOpenedBy(
opener, tabstrip_->active_index());
if (index != TabStripModel::kNoTab)
return index + 1;
// Otherwise insert adjacent to opener...
return tabstrip_->active_index() + 1;
}
// In other cases, such as Ctrl+T, open at the end of the strip.
return tabstrip_->count();
}
int TabStripModelOrderController::DetermineNewSelectedIndex(
int removing_index) const {
int tab_count = tabstrip_->count();
DCHECK(removing_index >= 0 && removing_index < tab_count);
content::WebContents* parent_opener =
tabstrip_->GetOpenerOfWebContentsAt(removing_index);
// First see if the index being removed has any "child" tabs. If it does, we
// want to select the first in that child group, not the next tab in the same
// group of the removed tab.
content::WebContents* removed_contents =
tabstrip_->GetWebContentsAt(removing_index);
// The parent opener should never be the same as the controller being removed.
DCHECK(parent_opener != removed_contents);
int index = tabstrip_->GetIndexOfNextWebContentsOpenedBy(removed_contents,
removing_index,
false);
if (index != TabStripModel::kNoTab)
return GetValidIndex(index, removing_index);
if (parent_opener) {
// If the tab was in a group, shift selection to the next tab in the group.
int index = tabstrip_->GetIndexOfNextWebContentsOpenedBy(parent_opener,
removing_index,
false);
if (index != TabStripModel::kNoTab)
return GetValidIndex(index, removing_index);
// If we can't find a subsequent group member, just fall back to the
// parent_opener itself. Note that we use "group" here since opener is
// reset by select operations..
index = tabstrip_->GetIndexOfWebContents(parent_opener);
if (index != TabStripModel::kNoTab)
return GetValidIndex(index, removing_index);
}
// No opener set, fall through to the default handler...
int selected_index = tabstrip_->active_index();
if (selected_index >= (tab_count - 1))
return selected_index - 1;
return selected_index;
}
void TabStripModelOrderController::ActiveTabChanged(
content::WebContents* old_contents,
content::WebContents* new_contents,
int index,
int reason) {
content::WebContents* old_opener = NULL;
if (old_contents) {
int index = tabstrip_->GetIndexOfWebContents(old_contents);
if (index != TabStripModel::kNoTab) {
old_opener = tabstrip_->GetOpenerOfWebContentsAt(index);
// Forget any group/opener relationships that need to be reset whenever
// selection changes (see comment in TabStripModel::AddWebContentsAt).
if (tabstrip_->ShouldResetGroupOnSelect(old_contents))
tabstrip_->ForgetGroup(old_contents);
}
}
content::WebContents* new_opener = tabstrip_->GetOpenerOfWebContentsAt(index);
if ((reason & CHANGE_REASON_USER_GESTURE) && new_opener != old_opener &&
((old_contents == NULL && new_opener == NULL) ||
new_opener != old_contents) &&
((new_contents == NULL && old_opener == NULL) ||
old_opener != new_contents)) {
tabstrip_->ForgetAllOpeners();
}
}
///////////////////////////////////////////////////////////////////////////////
// TabStripModelOrderController, private:
int TabStripModelOrderController::GetValidIndex(
int index, int removing_index) const {
if (removing_index < index)
index = std::max(0, index - 1);
return index;
}
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