forked from mirrors/gecko-dev
28f0bb0532
MozReview-Commit-ID: LQg6NEgCqz2 --HG-- extra : rebase_source : bfe13f52ec729a24ac53854b67d4613fd47b52bb
1084 lines
41 KiB
JavaScript
1084 lines
41 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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this.EXPORTED_SYMBOLS = ["PanelMultiView"];
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const {classes: Cc, interfaces: Ci, utils: Cu} = Components;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "CustomizableWidgets",
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"resource:///modules/CustomizableWidgets.jsm");
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/**
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* Simple implementation of the sliding window pattern; panels are added to a
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* linked list, in-order, and the currently shown panel is remembered using a
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* marker. The marker shifts as navigation between panels is continued, where
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* the panel at index 0 is always the starting point:
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* ┌────┬────┬────┬────┐
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* │▓▓▓▓│ │ │ │ Start
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* └────┴────┴────┴────┘
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* ┌────┬────┬────┬────┐
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* │ │▓▓▓▓│ │ │ Forward
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* └────┴────┴────┴────┘
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* ┌────┬────┬────┬────┐
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* │ │ │▓▓▓▓│ │ Forward
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* └────┴────┴────┴────┘
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* ┌────┬────┬────┬────┐
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* │ │▓▓▓▓│ │ │ Back
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* └────┴────┴────┴────┘
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*/
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class SlidingPanelViews extends Array {
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constructor() {
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super();
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this._marker = 0;
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}
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/**
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* Get the index that points to the currently selected view.
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*
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* @return {Number}
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*/
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get current() {
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return this._marker;
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}
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/**
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* Setter for the current index, which changes the order of elements and
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* updates the internal marker for the currently selected view.
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* We're manipulating the array directly to have it reflect the order of
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* navigation, instead of continuously growing the array with the next selected
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* view to keep memory usage within reasonable proportions. With this method,
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* the data structure grows no larger than the number of panels inside the
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* panelMultiView.
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*
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* @param {Number} index Index of the item to move to the current position.
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* @return {Number} The new marker index.
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*/
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set current(index) {
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if (index == this._marker) {
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// Never change a winning team.
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return index;
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}
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if (index == -1 || index > (this.length - 1)) {
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throw new Error(`SlidingPanelViews :: index ${index} out of bounds`);
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}
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let view = this.splice(index, 1)[0];
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if (this._marker > index) {
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// Correct the current marker if the view-to-select was removed somewhere
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// before it.
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--this._marker;
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}
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// Then add the view-to-select right after the currently selected view.
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this.splice(++this._marker, 0, view);
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return this._marker;
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}
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/**
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* Getter for the currently selected view node.
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*
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* @return {panelview}
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*/
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get currentView() {
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return this[this._marker];
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}
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/**
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* Setter for the currently selected view node.
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*
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* @param {panelview} view
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* @return {Number} Index of the currently selected view.
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*/
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set currentView(view) {
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if (!view)
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return this.current;
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// This will throw an error if the view could not be found.
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return this.current = this.indexOf(view);
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}
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/**
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* Getter for the previous view, which is always positioned one position after
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* the current view.
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*
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* @return {panelview}
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*/
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get previousView() {
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return this[this._marker + 1];
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}
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/**
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* Going back is an explicit action on the data structure, moving the marker
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* one step back.
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*
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* @return {Array} A list of two items: the newly selected view and the previous one.
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*/
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back() {
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if (this._marker > 0)
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--this._marker;
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return [this.currentView, this.previousView];
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}
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/**
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* Reset the data structure to its original construct, removing all references
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* to view nodes.
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*/
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clear() {
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this._marker = 0;
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this.splice(0, this.length);
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}
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}
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/**
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* This is the implementation of the panelUI.xml XBL binding, moved to this
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* module, to make it easier to fork the logic for the newer photon structure.
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* Goals are:
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* 1. to make it easier to programmatically extend the list of panels,
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* 2. allow for navigation between panels multiple levels deep and
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* 3. maintain the pre-photon structure with as little effort possible.
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*
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* @type {PanelMultiView}
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*/
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this.PanelMultiView = class {
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get document() {
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return this.node.ownerDocument;
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}
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get window() {
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return this.node.ownerGlobal;
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}
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get _panel() {
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return this.node.parentNode;
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}
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get showingSubView() {
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return this.node.getAttribute("viewtype") == "subview";
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}
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get _mainViewId() {
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return this.node.getAttribute("mainViewId");
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}
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set _mainViewId(val) {
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this.node.setAttribute("mainViewId", val);
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return val;
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}
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get _mainView() {
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return this._mainViewId ? this.document.getElementById(this._mainViewId) : null;
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}
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get _transitioning() {
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return this.__transitioning;
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}
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set _transitioning(val) {
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this.__transitioning = val;
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if (val) {
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this.node.setAttribute("transitioning", "true");
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} else {
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this.node.removeAttribute("transitioning");
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}
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}
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get panelViews() {
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// If there's a dedicated subViews container, we're not in the right binding
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// to use SlidingPanelViews.
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if (this._subViews)
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return null;
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if (this._panelViews)
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return this._panelViews;
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this._panelViews = new SlidingPanelViews();
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this._panelViews.push(...this.node.getElementsByTagName("panelview"));
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return this._panelViews;
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}
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get _dwu() {
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if (this.__dwu)
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return this.__dwu;
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return this.__dwu = this.window.QueryInterface(Ci.nsIInterfaceRequestor)
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.getInterface(Ci.nsIDOMWindowUtils);
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}
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get _screenManager() {
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if (this.__screenManager)
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return this.__screenManager;
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return this.__screenManager = Cc["@mozilla.org/gfx/screenmanager;1"]
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.getService(Ci.nsIScreenManager);
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}
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get _currentSubView() {
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return this.panelViews ? this.panelViews.currentView : this.__currentSubView;
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}
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set _currentSubView(panel) {
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if (this.panelViews)
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this.panelViews.currentView = panel;
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else
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this.__currentSubView = panel;
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return panel;
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}
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get _keyNavigationMap() {
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if (!this.__keyNavigationMap)
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this.__keyNavigationMap = new Map();
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return this.__keyNavigationMap;
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}
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get _multiLineElementsMap() {
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if (!this.__multiLineElementsMap)
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this.__multiLineElementsMap = new WeakMap();
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return this.__multiLineElementsMap;
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}
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constructor(xulNode, testMode = false) {
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this.node = xulNode;
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// If `testMode` is `true`, the consumer is only interested in accessing the
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// methods of this instance. (E.g. in unit tests.)
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if (testMode)
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return;
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this._currentSubView = this._anchorElement = this._subViewObserver = null;
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this._mainViewHeight = 0;
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this.__transitioning = this._ignoreMutations = false;
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const {document, window} = this;
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this._clickCapturer =
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document.getAnonymousElementByAttribute(this.node, "anonid", "clickCapturer");
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this._viewContainer =
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document.getAnonymousElementByAttribute(this.node, "anonid", "viewContainer");
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this._mainViewContainer =
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document.getAnonymousElementByAttribute(this.node, "anonid", "mainViewContainer");
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this._subViews =
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document.getAnonymousElementByAttribute(this.node, "anonid", "subViews");
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this._viewStack =
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document.getAnonymousElementByAttribute(this.node, "anonid", "viewStack");
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this._offscreenViewStack =
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document.getAnonymousElementByAttribute(this.node, "anonid", "offscreenViewStack");
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XPCOMUtils.defineLazyGetter(this, "_panelViewCache", () => {
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let viewCacheId = this.node.getAttribute("viewCacheId");
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return viewCacheId ? document.getElementById(viewCacheId) : null;
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});
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this._panel.addEventListener("popupshowing", this);
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this._panel.addEventListener("popuphidden", this);
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this._panel.addEventListener("popupshown", this);
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if (this.panelViews) {
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let cs = window.getComputedStyle(document.documentElement);
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// Set CSS-determined attributes now to prevent a layout flush when we do
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// it when transitioning between panels.
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this._dir = cs.direction;
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this.setMainView(this.panelViews.currentView);
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this.showMainView();
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} else {
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this._clickCapturer.addEventListener("click", this);
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this._mainViewContainer.setAttribute("panelid", this._panel.id);
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if (this._mainView) {
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this.setMainView(this._mainView);
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}
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}
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this.node.setAttribute("viewtype", "main");
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// Proxy these public properties and methods, as used elsewhere by various
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// parts of the browser, to this instance.
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["_mainView", "ignoreMutations", "showingSubView"].forEach(property => {
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Object.defineProperty(this.node, property, {
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enumerable: true,
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get: () => this[property],
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set: (val) => this[property] = val
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});
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});
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["goBack", "descriptionHeightWorkaround", "setMainView", "showMainView",
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"showSubView"].forEach(method => {
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Object.defineProperty(this.node, method, {
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enumerable: true,
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value: (...args) => this[method](...args)
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});
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});
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}
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destructor() {
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// Guard against re-entrancy.
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if (!this.node)
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return;
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if (this._mainView) {
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let mainView = this._mainView;
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if (this._panelViewCache)
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this._panelViewCache.appendChild(mainView);
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mainView.removeAttribute("mainview");
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}
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if (this._subViews)
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this._moveOutKids(this._subViews);
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if (this.panelViews) {
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this._moveOutKids(this._viewStack);
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this.panelViews.clear();
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} else {
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this._clickCapturer.removeEventListener("click", this);
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}
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this._panel.removeEventListener("popupshowing", this);
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this._panel.removeEventListener("popupshown", this);
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this._panel.removeEventListener("popuphidden", this);
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this.node = this._clickCapturer = this._viewContainer = this._mainViewContainer =
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this._subViews = this._viewStack = this.__dwu = this._panelViewCache = null;
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}
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/**
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* Remove any child subviews into the panelViewCache, to ensure
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* they remain usable even if this panelmultiview instance is removed
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* from the DOM.
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* @param viewNodeContainer the container from which to remove subviews
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*/
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_moveOutKids(viewNodeContainer) {
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if (!this._panelViewCache)
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return;
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// Node.children and Node.childNodes is live to DOM changes like the
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// ones we're about to do, so iterate over a static copy:
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let subviews = Array.from(viewNodeContainer.childNodes);
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for (let subview of subviews) {
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// XBL lists the 'children' XBL element explicitly. :-(
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if (subview.nodeName != "children")
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this._panelViewCache.appendChild(subview);
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}
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}
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goBack(target) {
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let [current, previous] = this.panelViews.back();
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return this.showSubView(current, target, previous);
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}
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/**
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* Checks whether it is possible to navigate backwards currently. Returns
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* false if this is the panelmultiview's mainview, true otherwise.
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*
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* @param {panelview} view View to check, defaults to the currently active view.
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* @return {Boolean}
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*/
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_canGoBack(view = this._currentSubView) {
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return view != this._mainView;
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}
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setMainView(aNewMainView) {
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if (this._mainView) {
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if (!this.panelViews)
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this._subViews.appendChild(this._mainView);
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this._mainView.removeAttribute("mainview");
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}
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this._mainViewId = aNewMainView.id;
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aNewMainView.setAttribute("mainview", "true");
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if (this.panelViews) {
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// If the new main view is not yet in the zeroth position, make sure it's
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// inserted there.
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if (aNewMainView.parentNode != this._viewStack && this._viewStack.firstChild != aNewMainView) {
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this._viewStack.insertBefore(aNewMainView, this._viewStack.firstChild);
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}
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} else {
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this._mainViewContainer.appendChild(aNewMainView);
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}
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}
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showMainView() {
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if (this.showingSubView) {
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let viewNode = this._currentSubView;
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let evt = new this.window.CustomEvent("ViewHiding", { bubbles: true, cancelable: true });
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viewNode.dispatchEvent(evt);
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if (this.panelViews) {
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viewNode.removeAttribute("current");
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this.showSubView(this._mainViewId);
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} else {
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this._transitionHeight(() => {
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viewNode.removeAttribute("current");
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this._currentSubView = null;
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this.node.setAttribute("viewtype", "main");
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});
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}
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}
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if (!this.panelViews) {
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this._shiftMainView();
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}
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}
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showSubView(aViewId, aAnchor, aPreviousView) {
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const {document, window} = this;
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return (async () => {
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// Support passing in the node directly.
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let viewNode = typeof aViewId == "string" ? this.node.querySelector("#" + aViewId) : aViewId;
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if (!viewNode) {
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viewNode = document.getElementById(aViewId);
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if (viewNode) {
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if (this.panelViews) {
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this._viewStack.appendChild(viewNode);
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this.panelViews.push(viewNode);
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} else {
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this._subViews.appendChild(viewNode);
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}
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} else {
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throw new Error(`Subview ${aViewId} doesn't exist!`);
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}
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}
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let reverse = !!aPreviousView;
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let previousViewNode = aPreviousView || this._currentSubView;
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let playTransition = (!!previousViewNode && previousViewNode != viewNode);
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let dwu, previousRect;
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if (playTransition || this.panelViews) {
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dwu = this._dwu;
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previousRect = previousViewNode.__lastKnownBoundingRect =
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dwu.getBoundsWithoutFlushing(previousViewNode);
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if (this.panelViews) {
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// Here go the measures that have the same caching lifetime as the width
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// of the main view, i.e. 'forever', during the instance lifetime.
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if (!this._mainViewWidth) {
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this._mainViewWidth = previousRect.width;
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let top = dwu.getBoundsWithoutFlushing(previousViewNode.firstChild || previousViewNode).top;
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let bottom = dwu.getBoundsWithoutFlushing(previousViewNode.lastChild || previousViewNode).bottom;
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this._viewVerticalPadding = previousRect.height - (bottom - top);
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}
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// Here go the measures that have the same caching lifetime as the height
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// of the main view, i.e. whilst the panel is shown and/ or visible.
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if (!this._mainViewHeight) {
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this._mainViewHeight = previousRect.height;
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this._viewContainer.style.minHeight = this._mainViewHeight + "px";
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}
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}
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}
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// Emit the ViewShowing event so that the widget definition has a chance
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// to lazily populate the subview with things.
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let detail = {
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blockers: new Set(),
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addBlocker(aPromise) {
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this.blockers.add(aPromise);
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},
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};
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// Make sure that new panels always have a title set.
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let cancel = false;
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if (this.panelViews && aAnchor) {
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if (aAnchor && !viewNode.hasAttribute("title"))
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viewNode.setAttribute("title", aAnchor.getAttribute("label"));
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viewNode.classList.add("PanelUI-subView");
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let custWidget = CustomizableWidgets.find(widget => widget.viewId == viewNode.id);
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if (custWidget) {
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if (custWidget.onInit)
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custWidget.onInit(aAnchor);
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custWidget.onViewShowing({ target: viewNode, preventDefault: () => cancel = true, detail });
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}
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}
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if (this.panelViews && this._mainViewWidth)
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viewNode.style.maxWidth = viewNode.style.minWidth = this._mainViewWidth + "px";
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let evt = new window.CustomEvent("ViewShowing", { bubbles: true, cancelable: true, detail });
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viewNode.dispatchEvent(evt);
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if (!cancel)
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cancel = evt.defaultPrevented;
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if (detail.blockers.size) {
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try {
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let results = await Promise.all(detail.blockers);
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cancel = cancel || results.some(val => val === false);
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} catch (e) {
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Cu.reportError(e);
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cancel = true;
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}
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}
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if (cancel) {
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return;
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}
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this._currentSubView = viewNode;
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viewNode.setAttribute("current", true);
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if (this.panelViews) {
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this.node.setAttribute("viewtype", "subview");
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if (!playTransition)
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this.descriptionHeightWorkaround(viewNode);
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}
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// Now we have to transition the panel. There are a few parts to this:
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//
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// 1) The main view content gets shifted so that the center of the anchor
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// node is at the left-most edge of the panel.
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// 2) The subview deck slides in so that it takes up almost all of the
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// panel.
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// 3) If the subview is taller then the main panel contents, then the panel
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// must grow to meet that new height. Otherwise, it must shrink.
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//
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// All three of these actions make use of CSS transformations, so they
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// should all occur simultaneously.
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if (this.panelViews && playTransition) {
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// Sliding the next subview in means that the previous panelview stays
|
|
// where it is and the active panelview slides in from the left in LTR
|
|
// mode, right in RTL mode.
|
|
let onTransitionEnd = () => {
|
|
evt = new window.CustomEvent("ViewHiding", { bubbles: true, cancelable: true });
|
|
previousViewNode.dispatchEvent(evt);
|
|
previousViewNode.removeAttribute("current");
|
|
this.descriptionHeightWorkaround(viewNode);
|
|
};
|
|
|
|
// There's absolutely no need to show off our epic animation skillz when
|
|
// the panel's not even open.
|
|
if (this._panel.state != "open") {
|
|
onTransitionEnd();
|
|
return;
|
|
}
|
|
|
|
if (aAnchor)
|
|
aAnchor.setAttribute("open", true);
|
|
|
|
// Set the viewContainer dimensions to make sure only the current view
|
|
// is visible.
|
|
this._viewContainer.style.height = Math.max(previousRect.height, this._mainViewHeight) + "px";
|
|
this._viewContainer.style.width = previousRect.width + "px";
|
|
// Lock the dimensions of the window that hosts the popup panel.
|
|
let rect = this._panel.popupBoxObject.getOuterScreenRect();
|
|
this._panel.setAttribute("width", rect.width);
|
|
this._panel.setAttribute("height", rect.height);
|
|
|
|
this._viewBoundsOffscreen(viewNode, viewRect => {
|
|
this._transitioning = true;
|
|
if (this._autoResizeWorkaroundTimer)
|
|
window.clearTimeout(this._autoResizeWorkaroundTimer);
|
|
this._viewContainer.setAttribute("transition-reverse", reverse);
|
|
let nodeToAnimate = reverse ? previousViewNode : viewNode;
|
|
|
|
if (!reverse) {
|
|
// We set the margin here to make sure the view is positioned next
|
|
// to the view that is currently visible. The animation is taken
|
|
// care of by transitioning the `transform: translateX()` property
|
|
// instead.
|
|
// Once the transition finished, we clean both properties up.
|
|
nodeToAnimate.style.marginInlineStart = previousRect.width + "px";
|
|
}
|
|
|
|
// Set the transition style and listen for its end to clean up and
|
|
// make sure the box sizing becomes dynamic again.
|
|
// Somehow, putting these properties in PanelUI.css doesn't work for
|
|
// newly shown nodes in a XUL parent node.
|
|
nodeToAnimate.style.transition = "transform ease-" + (reverse ? "in" : "out") +
|
|
" var(--panelui-subview-transition-duration)";
|
|
nodeToAnimate.style.willChange = "transform";
|
|
nodeToAnimate.style.borderInlineStart = "1px solid var(--panel-separator-color)";
|
|
|
|
// Wait until after the first paint to ensure setting 'current=true'
|
|
// has taken full effect; once both views are visible, we want to
|
|
// correctly measure rects using `dwu.getBoundsWithoutFlushing`.
|
|
window.addEventListener("MozAfterPaint", () => {
|
|
// Now set the viewContainer dimensions to that of the new view, which
|
|
// kicks of the height animation.
|
|
this._viewContainer.style.height = Math.max(viewRect.height, this._mainViewHeight) + "px";
|
|
this._viewContainer.style.width = viewRect.width + "px";
|
|
this._panel.removeAttribute("width");
|
|
this._panel.removeAttribute("height");
|
|
|
|
// The 'magic' part: build up the amount of pixels to move right or left.
|
|
let moveToLeft = (this._dir == "rtl" && !reverse) || (this._dir == "ltr" && reverse);
|
|
let movementX = reverse ? viewRect.width : previousRect.width;
|
|
let moveX = (moveToLeft ? "" : "-") + movementX;
|
|
nodeToAnimate.style.transform = "translateX(" + moveX + "px)";
|
|
// We're setting the width property to prevent flickering during the
|
|
// sliding animation with smaller views.
|
|
nodeToAnimate.style.width = viewRect.width + "px";
|
|
|
|
let listener;
|
|
this._viewContainer.addEventListener("transitionend", listener = ev => {
|
|
// It's quite common that `height` on the view container doesn't need
|
|
// to transition, so we make sure to do all the work on the transform
|
|
// transition-end, because that is guaranteed to happen.
|
|
if (ev.target != nodeToAnimate || ev.propertyName != "transform")
|
|
return;
|
|
|
|
this._viewContainer.removeEventListener("transitionend", listener);
|
|
onTransitionEnd();
|
|
this._transitioning = false;
|
|
this._resetKeyNavigation(previousViewNode);
|
|
|
|
// Myeah, panel layout auto-resizing is a funky thing. We'll wait
|
|
// another few milliseconds to remove the width and height 'fixtures',
|
|
// to be sure we don't flicker annoyingly.
|
|
// NB: HACK! Bug 1363756 is there to fix this.
|
|
this._autoResizeWorkaroundTimer = window.setTimeout(() => {
|
|
this._viewContainer.style.removeProperty("height");
|
|
this._viewContainer.style.removeProperty("width");
|
|
}, 500);
|
|
|
|
// Take another breather, just like before, to wait for the 'current'
|
|
// attribute removal to take effect. This prevents a flicker.
|
|
// The cleanup we do doesn't affect the display anymore, so we're not
|
|
// too fussed about the timing here.
|
|
window.addEventListener("MozAfterPaint", () => {
|
|
nodeToAnimate.style.removeProperty("border-inline-start");
|
|
nodeToAnimate.style.removeProperty("transition");
|
|
nodeToAnimate.style.removeProperty("transform");
|
|
nodeToAnimate.style.removeProperty("width");
|
|
|
|
if (!reverse)
|
|
viewNode.style.removeProperty("margin-inline-start");
|
|
if (aAnchor)
|
|
aAnchor.removeAttribute("open");
|
|
|
|
this._viewContainer.removeAttribute("transition-reverse");
|
|
|
|
viewNode.dispatchEvent(new window.CustomEvent("ViewShown",
|
|
{ bubbles: true, cancelable: false }));
|
|
}, { once: true });
|
|
});
|
|
}, { once: true });
|
|
});
|
|
} else if (!this.panelViews) {
|
|
this._transitionHeight(() => {
|
|
viewNode.setAttribute("current", true);
|
|
this.node.setAttribute("viewtype", "subview");
|
|
// Now that the subview is visible, we can check the height of the
|
|
// description elements it contains.
|
|
this.descriptionHeightWorkaround(viewNode);
|
|
viewNode.dispatchEvent(new window.CustomEvent("ViewShown",
|
|
{ bubbles: true, cancelable: false }));
|
|
});
|
|
this._shiftMainView(aAnchor);
|
|
}
|
|
})().catch(e => Cu.reportError(e));
|
|
}
|
|
|
|
/**
|
|
* Calculate the correct bounds of a panelview node offscreen to minimize the
|
|
* amount of paint flashing and keep the stack vs panel layouts from interfering.
|
|
*
|
|
* @param {panelview} viewNode Node to measure the bounds of.
|
|
* @param {Function} callback Called when we got the measurements in and pass
|
|
* them on as its first argument.
|
|
*/
|
|
_viewBoundsOffscreen(viewNode, callback) {
|
|
if (viewNode.__lastKnownBoundingRect) {
|
|
callback(viewNode.__lastKnownBoundingRect);
|
|
return;
|
|
}
|
|
|
|
let oldSibling = viewNode.nextSibling || null;
|
|
this._offscreenViewStack.appendChild(viewNode);
|
|
|
|
this.window.addEventListener("MozAfterPaint", () => {
|
|
let viewRect = this._dwu.getBoundsWithoutFlushing(viewNode);
|
|
|
|
try {
|
|
this._viewStack.insertBefore(viewNode, oldSibling);
|
|
} catch (ex) {
|
|
this._viewStack.appendChild(viewNode);
|
|
}
|
|
|
|
callback(viewRect);
|
|
}, { once: true });
|
|
}
|
|
|
|
/**
|
|
* Applies the height transition for which <panelmultiview> is designed.
|
|
*
|
|
* The height transition involves two elements, the viewContainer and its only
|
|
* immediate child the viewStack. In order for this to work correctly, the
|
|
* viewContainer must have "overflow: hidden;" and the two elements must have
|
|
* no margins or padding. This means that the height of the viewStack is never
|
|
* limited by the viewContainer, but when the height of the container is not
|
|
* constrained it matches the height of the viewStack.
|
|
*
|
|
* @param changeFn
|
|
* This synchronous function is called to make the DOM changes
|
|
* that will result in a new height of the viewStack.
|
|
*/
|
|
_transitionHeight(changeFn) {
|
|
if (this._panel.state != "open") {
|
|
changeFn();
|
|
return;
|
|
}
|
|
|
|
// Lock the dimensions of the window that hosts the popup panel. This
|
|
// in turn constrains the height of the viewContainer.
|
|
let rect = this._panel.popupBoxObject.getOuterScreenRect();
|
|
this._panel.setAttribute("width", rect.width);
|
|
this._panel.setAttribute("height", rect.height);
|
|
|
|
// Read the current height of the viewStack. If we are in the middle
|
|
// of a transition, this is the actual height of the element at this
|
|
// point in time.
|
|
let oldHeight = this._dwu.getBoundsWithoutFlushing(this._viewStack).height;
|
|
|
|
// Make the necessary DOM changes, and remove the "height" property of the
|
|
// viewStack to ensure that we read its final value even if we are in the
|
|
// middle of a transition. To avoid flickering, we have to prevent the panel
|
|
// from being painted in this temporary state, which requires a synchronous
|
|
// layout when reading the new height.
|
|
this._viewStack.style.removeProperty("height");
|
|
changeFn();
|
|
let newHeight = this._viewStack.getBoundingClientRect().height;
|
|
|
|
// Now we can allow the popup panel to resize again. This must occur
|
|
// in the same tick as the code below, but we can do this before
|
|
// setting the starting height in case the transition is not needed.
|
|
this._panel.removeAttribute("width");
|
|
this._panel.removeAttribute("height");
|
|
|
|
if (oldHeight != newHeight) {
|
|
// Height transitions can only occur between two numeric values, and
|
|
// cannot start if the height is not set. In case a transition is
|
|
// needed, we have to set the height to the old value, then force a
|
|
// synchronous layout so the panel won't resize unexpectedly.
|
|
this._viewStack.style.height = oldHeight + "px";
|
|
this._viewStack.getBoundingClientRect().height;
|
|
|
|
// We can now set the new height to start the transition, but
|
|
// before doing that we set up a listener to reset the height to
|
|
// "auto" at the end, so that DOM changes made after the
|
|
// transition ends are still reflected by the height of the panel.
|
|
let onTransitionEnd = event => {
|
|
if (event.target != this._viewStack) {
|
|
return;
|
|
}
|
|
this._viewStack.removeEventListener("transitionend", onTransitionEnd);
|
|
this._viewStack.style.removeProperty("height");
|
|
};
|
|
this._viewStack.addEventListener("transitionend", onTransitionEnd);
|
|
this._viewStack.style.height = newHeight + "px";
|
|
}
|
|
}
|
|
|
|
_shiftMainView(aAnchor) {
|
|
if (aAnchor) {
|
|
// We need to find the edge of the anchor, relative to the main panel.
|
|
// Then we need to add half the width of the anchor. This is the target
|
|
// that we need to transition to.
|
|
let anchorRect = aAnchor.getBoundingClientRect();
|
|
let mainViewRect = this._mainViewContainer.getBoundingClientRect();
|
|
let center = aAnchor.clientWidth / 2;
|
|
let direction = aAnchor.ownerGlobal.getComputedStyle(aAnchor).direction;
|
|
let edge;
|
|
if (direction == "ltr") {
|
|
edge = anchorRect.left - mainViewRect.left;
|
|
} else {
|
|
edge = mainViewRect.right - anchorRect.right;
|
|
}
|
|
|
|
// If the anchor is an element on the far end of the mainView we
|
|
// don't want to shift the mainView too far, we would reveal empty
|
|
// space otherwise.
|
|
let cstyle = this.window.getComputedStyle(this.document.documentElement);
|
|
let exitSubViewGutterWidth =
|
|
cstyle.getPropertyValue("--panel-ui-exit-subview-gutter-width");
|
|
let maxShift = mainViewRect.width - parseInt(exitSubViewGutterWidth);
|
|
let target = Math.min(maxShift, edge + center);
|
|
|
|
let neg = direction == "ltr" ? "-" : "";
|
|
this._mainViewContainer.style.transform = `translateX(${neg}${target}px)`;
|
|
aAnchor.setAttribute("panel-multiview-anchor", true);
|
|
} else {
|
|
this._mainViewContainer.style.transform = "";
|
|
if (this.anchorElement)
|
|
this.anchorElement.removeAttribute("panel-multiview-anchor");
|
|
}
|
|
this.anchorElement = aAnchor;
|
|
}
|
|
|
|
handleEvent(aEvent) {
|
|
if (aEvent.type.startsWith("popup") && aEvent.target != this._panel) {
|
|
// Shouldn't act on e.g. context menus being shown from within the panel.
|
|
return;
|
|
}
|
|
switch (aEvent.type) {
|
|
case "click":
|
|
if (aEvent.originalTarget == this._clickCapturer) {
|
|
this.showMainView();
|
|
}
|
|
break;
|
|
case "keydown":
|
|
this._keyNavigation(aEvent);
|
|
break;
|
|
case "mousemove":
|
|
this._resetKeyNavigation();
|
|
break;
|
|
case "popupshowing":
|
|
this.node.setAttribute("panelopen", "true");
|
|
// Bug 941196 - The panel can get taller when opening a subview. Disabling
|
|
// autoPositioning means that the panel won't jump around if an opened
|
|
// subview causes the panel to exceed the dimensions of the screen in the
|
|
// direction that the panel originally opened in. This property resets
|
|
// every time the popup closes, which is why we have to set it each time.
|
|
this._panel.autoPosition = false;
|
|
if (this.panelViews) {
|
|
this.window.addEventListener("keydown", this);
|
|
this._panel.addEventListener("mousemove", this);
|
|
}
|
|
|
|
// Before opening the panel, we have to limit the maximum height of any
|
|
// view based on the space that will be available. We cannot just use
|
|
// window.screen.availTop and availHeight because these may return an
|
|
// incorrect value when the window spans multiple screens.
|
|
let anchorBox = this._panel.anchorNode.boxObject;
|
|
let screen = this._screenManager.screenForRect(anchorBox.screenX,
|
|
anchorBox.screenY,
|
|
anchorBox.width,
|
|
anchorBox.height);
|
|
let availTop = {}, availHeight = {};
|
|
screen.GetAvailRect({}, availTop, {}, availHeight);
|
|
let cssAvailTop = availTop.value / screen.defaultCSSScaleFactor;
|
|
|
|
// The distance from the anchor to the available margin of the screen is
|
|
// based on whether the panel will open towards the top or the bottom.
|
|
let maxHeight;
|
|
if (this._panel.alignmentPosition.startsWith("before_")) {
|
|
maxHeight = anchorBox.screenY - cssAvailTop;
|
|
} else {
|
|
let anchorScreenBottom = anchorBox.screenY + anchorBox.height;
|
|
let cssAvailHeight = availHeight.value / screen.defaultCSSScaleFactor;
|
|
maxHeight = cssAvailTop + cssAvailHeight - anchorScreenBottom;
|
|
}
|
|
|
|
// To go from the maximum height of the panel to the maximum height of
|
|
// the view stack, we need to subtract the height of the arrow and the
|
|
// height of the opposite margin, but we cannot get their actual values
|
|
// because the panel is not visible yet. However, we know that this is
|
|
// currently 11px on Mac, 13px on Windows, and 13px on Linux. We also
|
|
// want an extra margin, both for visual reasons and to prevent glitches
|
|
// due to small rounding errors. So, we just use a value that makes
|
|
// sense for all platforms. If the arrow visuals change significantly,
|
|
// this value will be easy to adjust.
|
|
const EXTRA_MARGIN_PX = 20;
|
|
this._viewStack.style.maxHeight = (maxHeight - EXTRA_MARGIN_PX) + "px";
|
|
break;
|
|
case "popupshown":
|
|
// Now that the main view is visible, we can check the height of the
|
|
// description elements it contains.
|
|
this.descriptionHeightWorkaround();
|
|
break;
|
|
case "popuphidden":
|
|
this.node.removeAttribute("panelopen");
|
|
this.showMainView();
|
|
if (this.panelViews) {
|
|
for (let panelView of this._viewStack.children) {
|
|
if (panelView.nodeName != "children") {
|
|
panelView.style.removeProperty("min-width");
|
|
panelView.style.removeProperty("max-width");
|
|
}
|
|
}
|
|
this.window.removeEventListener("keydown", this);
|
|
this._panel.removeEventListener("mousemove", this);
|
|
this._resetKeyNavigation();
|
|
this._mainViewHeight = 0;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Allow for navigating subview buttons using the arrow keys and the Enter key.
|
|
* The Up and Down keys can be used to navigate the list up and down and the
|
|
* Enter, Right or Left - depending on the text direction - key can be used to
|
|
* simulate a click on the currently selected button.
|
|
* The Right or Left key - depending on the text direction - can be used to
|
|
* navigate to the previous view, functioning as a shortcut for the view's
|
|
* back button.
|
|
* Thus, in LTR mode:
|
|
* - The Right key functions the same as the Enter key, simulating a click
|
|
* - The Left key triggers a navigation back to the previous view.
|
|
*
|
|
* @param {KeyEvent} event
|
|
*/
|
|
_keyNavigation(event) {
|
|
if (this._transitioning)
|
|
return;
|
|
|
|
let view = this._currentSubView;
|
|
let navMap = this._keyNavigationMap.get(view);
|
|
if (!navMap) {
|
|
navMap = {};
|
|
this._keyNavigationMap.set(view, navMap);
|
|
}
|
|
|
|
let buttons = navMap.buttons;
|
|
if (!buttons || !buttons.length) {
|
|
buttons = navMap.buttons = this._getNavigableElements(view);
|
|
// Set the 'tabindex' attribute on the buttons to make sure they're focussable.
|
|
for (let button of buttons) {
|
|
if (button.classList.contains("subviewbutton-back"))
|
|
continue;
|
|
// If we've been here before, forget about it!
|
|
if (button.hasAttribute("tabindex"))
|
|
break;
|
|
button.setAttribute("tabindex", 0);
|
|
}
|
|
}
|
|
if (!buttons.length)
|
|
return;
|
|
|
|
let stop = () => {
|
|
event.stopPropagation();
|
|
event.preventDefault();
|
|
};
|
|
|
|
let keyCode = event.code;
|
|
switch (keyCode) {
|
|
case "ArrowDown":
|
|
case "ArrowUp": {
|
|
stop();
|
|
let isDown = (keyCode == "ArrowDown");
|
|
let maxIdx = buttons.length - 1;
|
|
let buttonIndex = isDown ? 0 : maxIdx;
|
|
if (typeof navMap.selected == "number") {
|
|
// Buttons may get selected whilst the panel is shown, so add an extra
|
|
// check here.
|
|
do {
|
|
buttonIndex = navMap.selected = (navMap.selected + (isDown ? 1 : -1));
|
|
} while (buttons[buttonIndex] && buttons[buttonIndex].disabled)
|
|
if (isDown && buttonIndex > maxIdx)
|
|
buttonIndex = 0;
|
|
else if (!isDown && buttonIndex < 0)
|
|
buttonIndex = maxIdx;
|
|
}
|
|
let button = buttons[buttonIndex];
|
|
button.focus();
|
|
navMap.selected = buttonIndex;
|
|
break;
|
|
}
|
|
case "ArrowLeft":
|
|
case "ArrowRight": {
|
|
stop();
|
|
let dir = this._dir;
|
|
if ((dir == "ltr" && keyCode == "ArrowLeft") ||
|
|
(dir == "rtl" && keyCode == "ArrowRight")) {
|
|
if (this._canGoBack(view))
|
|
this.goBack(view.backButton);
|
|
break;
|
|
}
|
|
// If the current button is _not_ one that points to a subview, pressing
|
|
// the arrow key shouldn't do anything.
|
|
if (!navMap.selected || !buttons[navMap.selected].classList.contains("subviewbutton-nav"))
|
|
break;
|
|
// Fall-through...
|
|
}
|
|
case "Enter": {
|
|
let button = buttons[navMap.selected];
|
|
if (!button)
|
|
break;
|
|
stop();
|
|
// Unfortunately, 'tabindex' doesn't not execute the default action, so
|
|
// we explicitly do this here.
|
|
button.click();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Clear all traces of keyboard navigation happening right now.
|
|
*
|
|
* @param {panelview} view View to reset the key navigation attributes of.
|
|
* Defaults to `this._currentSubView`.
|
|
*/
|
|
_resetKeyNavigation(view = this._currentSubView) {
|
|
let navMap = this._keyNavigationMap.get(view);
|
|
this._keyNavigationMap.clear();
|
|
if (!navMap)
|
|
return;
|
|
|
|
let buttons = this._getNavigableElements(view);
|
|
if (!buttons.length)
|
|
return;
|
|
|
|
let button = buttons[navMap.selected];
|
|
if (button)
|
|
button.blur();
|
|
}
|
|
|
|
/**
|
|
* Retrieve the button elements from a view node that can be used for navigation
|
|
* using the keyboard; enabled buttons and the back button, if visible.
|
|
*
|
|
* @param {nsIDOMNode} view
|
|
* @return {Array}
|
|
*/
|
|
_getNavigableElements(view) {
|
|
let buttons = Array.from(view.querySelectorAll(".subviewbutton:not([disabled])"));
|
|
if (this._canGoBack(view))
|
|
buttons.unshift(view.backButton);
|
|
let dwu = this._dwu;
|
|
return buttons.filter(button => {
|
|
let bounds = dwu.getBoundsWithoutFlushing(button);
|
|
return bounds.width > 0 && bounds.height > 0;
|
|
});
|
|
}
|
|
|
|
/**
|
|
* If the main view or a subview contains wrapping elements, the attribute
|
|
* "descriptionheightworkaround" should be set on the view to force all the
|
|
* wrapping "description", "label" or "toolbarbutton" elements to a fixed
|
|
* height. If the attribute is set and the visibility, contents, or width
|
|
* of any of these elements changes, this function should be called to
|
|
* refresh the calculated heights.
|
|
*
|
|
* This may trigger a synchronous layout.
|
|
*
|
|
* @param viewNode
|
|
* Indicates the node to scan for descendant elements. This is the main
|
|
* view if omitted.
|
|
*/
|
|
descriptionHeightWorkaround(viewNode = this._mainView) {
|
|
if (!viewNode.hasAttribute("descriptionheightworkaround")) {
|
|
// This view does not require the workaround.
|
|
return;
|
|
}
|
|
|
|
// We batch DOM changes together in order to reduce synchronous layouts.
|
|
// First we reset any change we may have made previously. The first time
|
|
// this is called, and in the best case scenario, this has no effect.
|
|
let items = [];
|
|
// Non-hidden <label> or <description> elements that also aren't empty
|
|
// and also don't have a value attribute can be multiline (if their
|
|
// text content is long enough).
|
|
let isMultiline = ":not(:-moz-any([hidden],[value],:empty))";
|
|
let selector = [
|
|
"description" + isMultiline,
|
|
"label" + isMultiline,
|
|
"toolbarbutton[wrap]:not([hidden])",
|
|
].join(",");
|
|
for (let element of viewNode.querySelectorAll(selector)) {
|
|
// Ignore items in hidden containers.
|
|
if (element.closest("[hidden]")) {
|
|
continue;
|
|
}
|
|
// Take the label for toolbarbuttons; it only exists on those elements.
|
|
element = element.labelElement || element;
|
|
|
|
let bounds = element.getBoundingClientRect();
|
|
let previous = this._multiLineElementsMap.get(element);
|
|
// We don't need to (re-)apply the workaround for invisible elements or
|
|
// on elements we've seen before and haven't changed in the meantime.
|
|
if (!bounds.width || !bounds.height ||
|
|
(previous && element.textContent == previous.textContent &&
|
|
bounds.width == previous.bounds.width)) {
|
|
continue;
|
|
}
|
|
|
|
items.push({ element });
|
|
}
|
|
|
|
// Removing the 'height' property will only cause a layout flush in the next
|
|
// loop below if it was set.
|
|
for (let item of items) {
|
|
item.element.style.removeProperty("height");
|
|
}
|
|
|
|
// We now read the computed style to store the height of any element that
|
|
// may contain wrapping text.
|
|
for (let item of items) {
|
|
item.bounds = item.element.getBoundingClientRect();
|
|
}
|
|
|
|
// Now we can make all the necessary DOM changes at once.
|
|
for (let { element, bounds } of items) {
|
|
this._multiLineElementsMap.set(element, { bounds, textContent: element.textContent });
|
|
element.style.height = bounds.height + "px";
|
|
}
|
|
}
|
|
}
|