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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import {$} from 'chrome://resources/js/util.js';
import {addNode, addNodeWithText, setNodeDisplay, setNodePosition} from './util.js';
import {View} from './view.js';
const TAB_LIST_ID = 'tab-list';
/** @type {?TabSwitcherView} */
let instance = null;
/**
* Controller and View for switching between tabs.
*
* The View part of TabSwitcherView displays the contents of the currently
* selected tab (only one tab can be active at a time).
*
* The controller part of TabSwitcherView hooks up a dropdown menu (i.e. HTML
* SELECT) to control switching between tabs.
*/
export class TabSwitcherView extends View {
constructor() {
super();
this.tabIdToView_ = {};
this.tabIdToLink_ = {};
// Map from tab id to the views link visiblity.
this.tabIdsLinkVisibility_ = new Map();
this.activeTabId_ = null;
this.onTabSwitched_ = null;
// The ideal width of the tab list. If width is reduced below this, the
// tab list will be shrunk, but it will be returned to this width once it
// can be.
this.tabListWidth_ = $(TAB_LIST_ID).offsetWidth;
}
/**
* @param {!Function} onTabSwitched Callback to run when the
* active tab changes. Called as
* onTabSwitched(oldTabId, newTabId).
*/
setOnTabSwitched(onTabSwitched) {
this.onTabSwitched_ = onTabSwitched;
}
// ---------------------------------------------
// Override methods in View
// ---------------------------------------------
setGeometry(left, top, width, height) {
super.setGeometry(this, left, top, width, height);
const tabListNode = $(TAB_LIST_ID);
// Set position of the tab list. Can't use DivView because DivView sets
// a fixed width at creation time, and need to set the width of the tab
// list only after its been populated.
let tabListWidth = this.tabListWidth_;
if (tabListWidth > width) {
tabListWidth = width;
}
tabListNode.style.position = 'absolute';
setNodePosition(tabListNode, left, top, tabListWidth, height);
// Position each of the tab's content areas.
for (const tabId in this.tabIdToView_) {
const view = this.tabIdToView_[tabId];
view.setGeometry(left + tabListWidth, top, width - tabListWidth, height);
}
}
show(isVisible) {
super.show(isVisible);
const activeView = this.getActiveTabView();
if (activeView) {
activeView.show(isVisible);
}
}
// ---------------------------------------------
/**
* Adds a new tab (initially hidden). To ensure correct tab list sizing,
* may only be called before first layout.
*
* @param {string} tabId The ID to refer to the tab by.
* @param {!View} view The tab's actual contents.
* @param {string} name The name for the menu item that selects the tab.
*/
addTab(tabId, view, name, hash) {
if (!tabId) {
throw Error('Must specify a non-false tabId');
}
this.tabIdToView_[tabId] = view;
this.tabIdsLinkVisibility_.set(tabId, true);
const node = addNodeWithText($(TAB_LIST_ID), 'a', name);
node.href = hash;
this.tabIdToLink_[tabId] = node;
addNode($(TAB_LIST_ID), 'br');
// Tab content views start off hidden.
view.show(false);
this.tabListWidth_ = $(TAB_LIST_ID).offsetWidth;
}
getAllTabViews() {
return this.tabIdToView_;
}
getTabView(tabId) {
return this.tabIdToView_[tabId];
}
getActiveTabView() {
return this.tabIdToView_[this.activeTabId_];
}
getActiveTabId() {
return this.activeTabId_;
}
/**
* Changes the currently active tab to |tabId|. This has several effects:
* (1) Replace the tab contents view with that of the new tab.
* (2) Update the dropdown menu's current selection.
* (3) Invoke the optional onTabSwitched callback.
*/
switchToTab(tabId) {
const newView = this.getTabView(tabId);
if (!newView) {
throw Error('Invalid tabId');
}
const oldTabId = this.activeTabId_;
this.activeTabId_ = tabId;
if (oldTabId) {
this.tabIdToLink_[oldTabId].classList.remove('selected');
// Hide the previously visible tab contents.
this.getTabView(oldTabId).show(false);
}
this.tabIdToLink_[tabId].classList.add('selected');
newView.show(this.isVisible());
if (this.onTabSwitched_) {
this.onTabSwitched_(oldTabId, tabId);
}
}
static getInstance() {
return instance || (instance = new TabSwitcherView());
}
}
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