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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.
#ifndef CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_H_
#define CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_H_
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include <vector>
#include "base/containers/span.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
#include "chrome/browser/ui/tabs/tab_strip_model_order_controller.h"
#include "ui/base/models/list_selection_model.h"
#include "ui/base/page_transition_types.h"
class Profile;
class TabStripModelDelegate;
namespace content {
class WebContents;
}
////////////////////////////////////////////////////////////////////////////////
//
// TabStripModel
//
// A model & low level controller of a Browser Window tabstrip. Holds a vector
// of WebContentses, and provides an API for adding, removing and
// shuffling them, as well as a higher level API for doing specific Browser-
// related tasks like adding new Tabs from just a URL, etc.
//
// Each tab may be pinned. Pinned tabs are locked to the left side of the tab
// strip and rendered differently (small tabs with only a favicon). The model
// makes sure all pinned tabs are at the beginning of the tab strip. For
// example, if a non-pinned tab is added it is forced to be with non-pinned
// tabs. Requests to move tabs outside the range of the tab type are ignored.
// For example, a request to move a pinned tab after non-pinned tabs is ignored.
//
// A TabStripModel has one delegate that it relies on to perform certain tasks
// like creating new TabStripModels (probably hosted in Browser windows) when
// required. See TabStripDelegate above for more information.
//
// A TabStripModel also has N observers (see TabStripModelObserver above),
// which can be registered via Add/RemoveObserver. An Observer is notified of
// tab creations, removals, moves, and other interesting events. The
// TabStrip implements this interface to know when to create new tabs in
// the View, and the Browser object likewise implements to be able to update
// its bookkeeping when such events happen.
//
////////////////////////////////////////////////////////////////////////////////
class TabStripModel {
public:
// Used to specify what should happen when the tab is closed.
enum CloseTypes {
CLOSE_NONE = 0,
// Indicates the tab was closed by the user. If true,
// WebContents::SetClosedByUserGesture(true) is invoked.
CLOSE_USER_GESTURE = 1 << 0,
// If true the history is recorded so that the tab can be reopened later.
// You almost always want to set this.
CLOSE_CREATE_HISTORICAL_TAB = 1 << 1,
};
// Constants used when adding tabs.
enum AddTabTypes {
// Used to indicate nothing special should happen to the newly inserted
// tab.
ADD_NONE = 0,
// The tab should be active.
ADD_ACTIVE = 1 << 0,
// The tab should be pinned.
ADD_PINNED = 1 << 1,
// If not set the insertion index of the WebContents is left up to
// the Order Controller associated, so the final insertion index may differ
// from the specified index. Otherwise the index supplied is used.
ADD_FORCE_INDEX = 1 << 2,
// If set the newly inserted tab inherits the group of the currently
// selected tab. If not set the tab may still inherit the group under
// certain situations.
ADD_INHERIT_GROUP = 1 << 3,
// If set the newly inserted tab's opener is set to the active tab. If not
// set the tab may still inherit the group/opener under certain situations.
// NOTE: this is ignored if ADD_INHERIT_GROUP is set.
ADD_INHERIT_OPENER = 1 << 4,
};
// Enumerates different ways to open a new tab. Does not apply to opening
// existing links or searches in a new tab, only to brand new empty tabs.
enum NewTab {
// New tab was opened using the new tab button on the tab strip.
NEW_TAB_BUTTON,
// New tab was opened using the menu command - either through the keyboard
// shortcut, or by opening the menu and selecting the command. Applies to
// both app menu and the menu bar's File menu (on platforms that have one).
NEW_TAB_COMMAND,
// New tab was opened through the context menu on the tab strip.
NEW_TAB_CONTEXT_MENU,
// Number of enum entries, used for UMA histogram reporting macros.
NEW_TAB_ENUM_COUNT,
};
static const int kNoTab = -1;
// Construct a TabStripModel with a delegate to help it do certain things
// (see the TabStripModelDelegate documentation). |delegate| cannot be NULL.
explicit TabStripModel(TabStripModelDelegate* delegate, Profile* profile);
~TabStripModel();
// Retrieves the TabStripModelDelegate associated with this TabStripModel.
TabStripModelDelegate* delegate() const { return delegate_; }
// Add and remove observers to changes within this TabStripModel.
void AddObserver(TabStripModelObserver* observer);
void RemoveObserver(TabStripModelObserver* observer);
// Retrieve the number of WebContentses/emptiness of the TabStripModel.
int count() const { return static_cast<int>(contents_data_.size()); }
bool empty() const { return contents_data_.empty(); }
// Retrieve the Profile associated with this TabStripModel.
Profile* profile() const { return profile_; }
// Retrieve the index of the currently active WebContents. This will be
// ui::ListSelectionModel::kUnselectedIndex if no tab is currently selected
// (this happens while the tab strip is being initialized or is empty).
int active_index() const { return selection_model_.active(); }
// Returns true if the tabstrip is currently closing all open tabs (via a
// call to CloseAllTabs). As tabs close, the selection in the tabstrip
// changes which notifies observers, which can use this as an optimization to
// avoid doing meaningless or unhelpful work.
bool closing_all() const { return closing_all_; }
// Basic API /////////////////////////////////////////////////////////////////
// Determines if the specified index is contained within the TabStripModel.
bool ContainsIndex(int index) const;
// Adds the specified WebContents in the default location. Tabs opened
// in the foreground inherit the group of the previously active tab.
void AppendWebContents(std::unique_ptr<content::WebContents> contents,
bool foreground);
// Adds the specified WebContents at the specified location.
// |add_types| is a bitmask of AddTabTypes; see it for details.
//
// All append/insert methods end up in this method.
//
// NOTE: adding a tab using this method does NOT query the order controller,
// as such the ADD_FORCE_INDEX AddTabTypes is meaningless here. The only time
// the |index| is changed is if using the index would result in breaking the
// constraint that all pinned tabs occur before non-pinned tabs.
// See also AddWebContents.
void InsertWebContentsAt(int index,
std::unique_ptr<content::WebContents> contents,
int add_types);
// Closes the WebContents at the specified index. This causes the
// WebContents to be destroyed, but it may not happen immediately.
// |close_types| is a bitmask of CloseTypes. Returns true if the
// WebContents was closed immediately, false if it was not closed (we
// may be waiting for a response from an onunload handler, or waiting for the
// user to confirm closure).
bool CloseWebContentsAt(int index, uint32_t close_types);
// Replaces the WebContents at |index| with |new_contents|. The
// WebContents that was at |index| is returned and its ownership returns
// to the caller.
std::unique_ptr<content::WebContents> ReplaceWebContentsAt(
int index,
std::unique_ptr<content::WebContents> new_contents);
// Detaches the WebContents at the specified index from this strip. The
// WebContents is not destroyed, just removed from display. The caller
// is responsible for doing something with it (e.g. stuffing it into another
// strip). Returns the detached WebContents.
std::unique_ptr<content::WebContents> DetachWebContentsAt(int index);
// Makes the tab at the specified index the active tab. |user_gesture| is true
// if the user actually clicked on the tab or navigated to it using a keyboard
// command, false if the tab was activated as a by-product of some other
// action.
void ActivateTabAt(int index, bool user_gesture);
// Adds tab at |index| to the currently selected tabs, without changing the
// active tab index.
void AddTabAtToSelection(int index);
// Move the WebContents at the specified index to another index. This
// method does NOT send Detached/Attached notifications, rather it moves the
// WebContents inline and sends a Moved notification instead.
// If |select_after_move| is false, whatever tab was selected before the move
// will still be selected, but its index may have incremented or decremented
// one slot.
void MoveWebContentsAt(int index, int to_position, bool select_after_move);
// Moves the selected tabs to |index|. |index| is treated as if the tab strip
// did not contain any of the selected tabs. For example, if the tabstrip
// contains [A b c D E f] (upper case selected) and this is invoked with 1 the
// result is [b A D E c f].
// This method maintains that all pinned tabs occur before non-pinned tabs.
// When pinned tabs are selected the move is processed in two chunks: first
// pinned tabs are moved, then non-pinned tabs are moved. If the index is
// after (pinned-tab-count - selected-pinned-tab-count), then the index the
// non-pinned selected tabs are moved to is (index +
// selected-pinned-tab-count). For example, if the model consists of
// [A b c D E f] (A b c are pinned) and this is invoked with 2, the result is
// [b c A D E f]. In this example nothing special happened because the target
// index was <= (pinned-tab-count - selected-pinned-tab-count). If the target
// index were 3, then the result would be [b c A f D F]. A, being pinned, can
// move no further than index 2. The non-pinned tabs are moved to the target
// index + selected-pinned tab-count (3 + 1).
void MoveSelectedTabsTo(int index);
// Returns the currently active WebContents, or NULL if there is none.
content::WebContents* GetActiveWebContents() const;
// Returns the WebContents at the specified index, or NULL if there is
// none.
content::WebContents* GetWebContentsAt(int index) const;
// Returns the index of the specified WebContents, or TabStripModel::kNoTab
// if the WebContents is not in this TabStripModel.
int GetIndexOfWebContents(const content::WebContents* contents) const;
// Notify any observers that the WebContents at the specified index has
// changed in some way. See TabChangeType for details of |change_type|.
void UpdateWebContentsStateAt(int index, TabChangeType change_type);
// Cause a tab to display a UI indication to the user that it needs their
// attention.
void SetTabNeedsAttentionAt(int index, bool attention);
// Close all tabs at once. Code can use closing_all() above to defer
// operations that might otherwise by invoked by the flurry of detach/select
// notifications this method causes.
void CloseAllTabs();
// Returns true if there are any WebContentses that are currently loading.
bool TabsAreLoading() const;
// Returns the WebContents that opened the WebContents at |index|, or NULL if
// there is no opener on record.
content::WebContents* GetOpenerOfWebContentsAt(int index);
// Changes the |opener| of the WebContents at |index|.
// Note: |opener| must be in this tab strip.
void SetOpenerOfWebContentsAt(int index, content::WebContents* opener);
// Returns the index of the last WebContents in the model opened by the
// specified opener, starting at |start_index|.
int GetIndexOfLastWebContentsOpenedBy(const content::WebContents* opener,
int start_index) const;
// To be called when a navigation is about to occur in the specified
// WebContents. Depending on the tab, and the transition type of the
// navigation, the TabStripModel may adjust its selection and grouping
// behavior.
void TabNavigating(content::WebContents* contents,
ui::PageTransition transition);
// Changes the blocked state of the tab at |index|.
void SetTabBlocked(int index, bool blocked);
// Changes the pinned state of the tab at |index|. See description above
// class for details on this.
void SetTabPinned(int index, bool pinned);
// Returns true if the tab at |index| is pinned.
// See description above class for details on pinned tabs.
bool IsTabPinned(int index) const;
// Returns true if the tab at |index| is blocked by a tab modal dialog.
bool IsTabBlocked(int index) const;
// Returns the index of the first tab that is not a pinned tab. This returns
// |count()| if all of the tabs are pinned tabs, and 0 if none of the tabs are
// pinned tabs.
int IndexOfFirstNonPinnedTab() const;
// Extends the selection from the anchor to |index|.
void ExtendSelectionTo(int index);
// Toggles the selection at |index|. This does nothing if |index| is selected
// and there are no other selected tabs.
void ToggleSelectionAt(int index);
// Makes sure the tabs from the anchor to |index| are selected. This only
// adds to the selection.
void AddSelectionFromAnchorTo(int index);
// Returns true if the tab at |index| is selected.
bool IsTabSelected(int index) const;
// Sets the selection to match that of |source|.
void SetSelectionFromModel(ui::ListSelectionModel source);
const ui::ListSelectionModel& selection_model() const;
// Command level API /////////////////////////////////////////////////////////
// Adds a WebContents at the best position in the TabStripModel given
// the specified insertion index, transition, etc. |add_types| is a bitmask of
// AddTabTypes; see it for details. This method ends up calling into
// InsertWebContentsAt to do the actual insertion. Pass kNoTab for |index| to
// append the contents to the end of the tab strip.
void AddWebContents(std::unique_ptr<content::WebContents> contents,
int index,
ui::PageTransition transition,
int add_types);
// Closes the selected tabs.
void CloseSelectedTabs();
// Select adjacent tabs
void SelectNextTab();
void SelectPreviousTab();
// Selects the last tab in the tab strip.
void SelectLastTab();
// Swap adjacent tabs.
void MoveTabNext();
void MoveTabPrevious();
// View API //////////////////////////////////////////////////////////////////
// Context menu functions.
enum ContextMenuCommand {
CommandFirst,
CommandNewTab,
CommandReload,
CommandDuplicate,
CommandCloseTab,
CommandCloseOtherTabs,
CommandCloseTabsToRight,
CommandRestoreTab,
CommandTogglePinned,
CommandToggleTabAudioMuted,
CommandToggleSiteMuted,
CommandBookmarkAllTabs,
CommandSelectByDomain,
CommandSelectByOpener,
CommandLast
};
// Returns true if the specified command is enabled. If |context_index| is
// selected the response applies to all selected tabs.
bool IsContextMenuCommandEnabled(int context_index,
ContextMenuCommand command_id) const;
// Performs the action associated with the specified command for the given
// TabStripModel index |context_index|. If |context_index| is selected the
// command applies to all selected tabs.
void ExecuteContextMenuCommand(int context_index,
ContextMenuCommand command_id);
// Returns a vector of indices of the tabs that will close when executing the
// command |id| for the tab at |index|. The returned indices are sorted in
// descending order.
std::vector<int> GetIndicesClosedByCommand(int index,
ContextMenuCommand id) const;
// Returns true if 'CommandToggleTabAudioMuted' will mute. |index| is the
// index supplied to |ExecuteContextMenuCommand|.
bool WillContextMenuMute(int index);
// Returns true if 'CommandToggleSiteMuted' will mute. |index| is the
// index supplied to |ExecuteContextMenuCommand|.
bool WillContextMenuMuteSites(int index);
// Returns true if 'CommandTogglePinned' will pin. |index| is the index
// supplied to |ExecuteContextMenuCommand|.
bool WillContextMenuPin(int index);
// Convert a ContextMenuCommand into a browser command. Returns true if a
// corresponding browser command exists, false otherwise.
static bool ContextMenuCommandToBrowserCommand(int cmd_id, int* browser_cmd);
// Access the order controller. Exposed only for unit tests.
TabStripModelOrderController* order_controller() const {
return order_controller_.get();
}
// Returns the index of the next WebContents in the sequence of WebContentses
// spawned by the specified WebContents after |start_index|. If |use_group| is
// true, the group property of the tab is used instead of the opener to find
// the next tab. Under some circumstances the group relationship may exist but
// the opener may not.
int GetIndexOfNextWebContentsOpenedBy(const content::WebContents* opener,
int start_index,
bool use_group) const;
// Forget all Opener relationships that are stored (but _not_ group
// relationships!) This is to reduce unpredictable tab switching behavior
// in complex session states. The exact circumstances under which this method
// is called are left up to the implementation of the selected
// TabStripModelOrderController.
void ForgetAllOpeners();
// Forgets the group affiliation of the specified WebContents. This
// should be called when a WebContents that is part of a logical group
// of tabs is moved to a new logical context by the user (e.g. by typing a new
// URL or selecting a bookmark). This also forgets the opener, which is
// considered a weaker relationship than group.
void ForgetGroup(content::WebContents* contents);
// Returns true if the group/opener relationships present for |contents|
// should be reset when _any_ selection change occurs in the model.
bool ShouldResetGroupOnSelect(content::WebContents* contents) const;
private:
class WebContentsData;
struct DetachedWebContents;
struct DetachNotifications;
// Used when making selection notifications.
enum class Notify {
kDefault,
// The selection is changing from a user gesture.
kUserGesture,
};
// Performs all the work to detach a WebContents instance but avoids sending
// most notifications. TabClosingAt() and TabDetachedAt() are sent because
// observers are reliant on the selection model being accurate at the time
// that TabDetachedAt() is called.
std::unique_ptr<content::WebContents> DetachWebContentsImpl(
int index,
bool create_historical_tab,
bool will_delete);
// We batch send notifications. This has two benefits:
// 1) This allows us to send the minimal number of necessary notifications.
// This is important because some notifications cause the main thread to
// synchronously communicate with the GPU process and cause jank.
// https://crbug.com/826287.
// 2) This allows us to avoid some problems caused by re-entrancy [e.g.
// using destroyed WebContents instances]. Ideally, this second check
// wouldn't be necessary because we would enforce that there is no
// re-entrancy in the TabStripModel, but that condition is currently
// violated in tests [and possibly in the wild as well].
void SendDetachWebContentsNotifications(DetachNotifications* notifications);
bool ContainsWebContents(content::WebContents* contents);
bool RunUnloadListenerBeforeClosing(content::WebContents* contents);
bool ShouldRunUnloadListenerBeforeClosing(content::WebContents* contents);
int ConstrainInsertionIndex(int index, bool pinned_tab);
// Convenience for converting a vector of indices into a vector of
// WebContents.
std::vector<content::WebContents*> GetWebContentsFromIndices(
const std::vector<int>& indices) const;
// Gets the set of tab indices whose domain matches the tab at |index|.
void GetIndicesWithSameDomain(int index, std::vector<int>* indices);
// Gets the set of tab indices that have the same opener as the tab at
// |index|.
void GetIndicesWithSameOpener(int index, std::vector<int>* indices);
// If |index| is selected all the selected indices are returned, otherwise a
// vector with |index| is returned. This is used when executing commands to
// determine which indices the command applies to.
std::vector<int> GetIndicesForCommand(int index) const;
// Returns true if the specified WebContents is a New Tab at the end of
// the tabstrip. We check for this because opener relationships are _not_
// forgotten for the New Tab page opened as a result of a New Tab gesture
// (e.g. Ctrl+T, etc) since the user may open a tab transiently to look up
// something related to their current activity.
bool IsNewTabAtEndOfTabStrip(content::WebContents* contents) const;
// Closes the WebContentses at the specified indices. This causes the
// WebContentses to be destroyed, but it may not happen immediately. If
// the page in question has an unload event the WebContents will not be
// destroyed until after the event has completed, which will then call back
// into this method.
//
// Returns true if the WebContentses were closed immediately, false if we
// are waiting for the result of an onunload handler.
bool InternalCloseTabs(base::span<content::WebContents* const> items,
uint32_t close_types);
// |close_types| is a bitmask of the types in CloseTypes.
// Returns true if all the tabs have been deleted. A return value of false
// means some portion (potentially none) of the WebContents were deleted.
// WebContents not deleted by this function are processing unload handlers
// which may eventually be deleted based on the results of the unload handler.
// Additionally processing the unload handlers may result in needing to show
// UI for the WebContents. See UnloadController for details on how unload
// handlers are processed.
bool CloseWebContentses(base::span<content::WebContents* const> items,
uint32_t close_types);
// Gets the WebContents at an index. Does no bounds checking.
content::WebContents* GetWebContentsAtImpl(int index) const;
// Returns the WebContentses at the specified indices. This does no checking
// of the indices, it is assumed they are valid.
std::vector<content::WebContents*> GetWebContentsesByIndices(
const std::vector<int>& indices);
// Notifies the observers if the active tab has changed.
void NotifyIfActiveTabChanged(content::WebContents* old_contents,
Notify notify_types);
// Notifies the observers if the active tab or the tab selection has changed.
// |old_model| is a snapshot of |selection_model_| before the change.
// Note: This function might end up sending 0 to 2 notifications in the
// following order: ActiveTabChanged, TabSelectionChanged.
void NotifyIfActiveOrSelectionChanged(
content::WebContents* old_contents,
Notify notify_types,
const ui::ListSelectionModel& old_model);
// Sets the selection to |new_model| and notifies any observers.
// Note: This function might end up sending 0 to 3 notifications in the
// following order: TabDeactivated, ActiveTabChanged, TabSelectionChanged.
void SetSelection(ui::ListSelectionModel new_model, Notify notify_types);
// Selects either the next tab (|forward| is true), or the previous tab
// (|forward| is false).
void SelectRelativeTab(bool forward);
// Does the work of MoveWebContentsAt. This has no checks to make sure the
// position is valid, those are done in MoveWebContentsAt.
void MoveWebContentsAtImpl(int index,
int to_position,
bool select_after_move);
// Implementation of MoveSelectedTabsTo. Moves |length| of the selected tabs
// starting at |start| to |index|. See MoveSelectedTabsTo for more details.
void MoveSelectedTabsToImpl(int index, size_t start, size_t length);
// Returns true if the tab represented by the specified data has an opener
// that matches the specified one. If |use_group| is true, then this will
// fall back to check the group relationship as well.
static bool OpenerMatches(const std::unique_ptr<WebContentsData>& data,
const content::WebContents* opener,
bool use_group);
// Sets the group/opener of any tabs that reference the tab at |index| to that
// tab's group/opener respectively.
void FixOpenersAndGroupsReferencing(int index);
// The WebContents data currently hosted within this TabStripModel.
std::vector<std::unique_ptr<WebContentsData>> contents_data_;
TabStripModelDelegate* delegate_;
base::ObserverList<TabStripModelObserver> observers_;
// A profile associated with this TabStripModel.
Profile* profile_;
// True if all tabs are currently being closed via CloseAllTabs.
bool closing_all_ = false;
// An object that determines where new Tabs should be inserted and where
// selection should move when a Tab is closed.
std::unique_ptr<TabStripModelOrderController> order_controller_;
ui::ListSelectionModel selection_model_;
// Indicates if observers are currently being notified to catch reentrancy
// bugs. See for example http://crbug.com/529407
bool in_notify_ = false;
base::WeakPtrFactory<TabStripModel> weak_factory_;
DISALLOW_IMPLICIT_CONSTRUCTORS(TabStripModel);
};
#endif // CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_H_