gnome-shell/js/ui/genericDisplay.js
Milan Bouchet-Valat 3852176e80 Use a fading icon button in genericDisplay
Add a new icon button in button.js that fades in/out with a short delay when the mouse enters/leaves its parent. Use it for the information button of genericDisplay.
2009-07-05 10:40:50 +02:00

801 lines
32 KiB
JavaScript

/* -*- mode: js2; js2-basic-offset: 4; indent-tabs-mode: nil -*- */
const Big = imports.gi.Big;
const Clutter = imports.gi.Clutter;
const Gio = imports.gi.Gio;
const Gdk = imports.gi.Gdk;
const Gtk = imports.gi.Gtk;
const Lang = imports.lang;
const Mainloop = imports.mainloop;
const Pango = imports.gi.Pango;
const Signals = imports.signals;
const Shell = imports.gi.Shell;
const Tidy = imports.gi.Tidy;
const Button = imports.ui.button;
const DND = imports.ui.dnd;
const Link = imports.ui.link;
const ITEM_DISPLAY_NAME_COLOR = new Clutter.Color();
ITEM_DISPLAY_NAME_COLOR.from_pixel(0xffffffff);
const ITEM_DISPLAY_DESCRIPTION_COLOR = new Clutter.Color();
ITEM_DISPLAY_DESCRIPTION_COLOR.from_pixel(0xffffffbb);
const ITEM_DISPLAY_BACKGROUND_COLOR = new Clutter.Color();
ITEM_DISPLAY_BACKGROUND_COLOR.from_pixel(0x00000000);
const ITEM_DISPLAY_SELECTED_BACKGROUND_COLOR = new Clutter.Color();
ITEM_DISPLAY_SELECTED_BACKGROUND_COLOR.from_pixel(0x4f6fadaa);
const DISPLAY_CONTROL_SELECTED_COLOR = new Clutter.Color();
DISPLAY_CONTROL_SELECTED_COLOR.from_pixel(0x112288ff);
const PREVIEW_BOX_BACKGROUND_COLOR = new Clutter.Color();
PREVIEW_BOX_BACKGROUND_COLOR.from_pixel(0xADADADf0);
const HOT_PINK_DEBUG = new Clutter.Color();
HOT_PINK_DEBUG.from_pixel(0xFF8888FF);
const ITEM_DISPLAY_HEIGHT = 50;
const ITEM_DISPLAY_ICON_SIZE = 48;
const ITEM_DISPLAY_PADDING_TOP = 1;
const ITEM_DISPLAY_PADDING_RIGHT = 2;
const DEFAULT_COLUMN_GAP = 6;
const LABEL_HEIGHT = 16;
const PREVIEW_ICON_SIZE = 96;
const PREVIEW_BOX_PADDING = 6;
const PREVIEW_BOX_SPACING = 4;
const PREVIEW_BOX_CORNER_RADIUS = 10;
// how far relative to the full item width the preview box should be placed
const PREVIEW_PLACING = 3/4;
const PREVIEW_DETAILS_MIN_WIDTH = PREVIEW_ICON_SIZE * 2;
const INFORMATION_BUTTON_SIZE = 16;
/* This is a virtual class that represents a single display item containing
* a name, a description, and an icon. It allows selecting an item and represents
* it by highlighting it with a different background color than the default.
*
* availableWidth - total width available for the item
*/
function GenericDisplayItem(availableWidth) {
this._init(availableWidth);
}
GenericDisplayItem.prototype = {
_init: function(availableWidth) {
this._availableWidth = availableWidth;
this.actor = new Clutter.Group({ reactive: true,
width: availableWidth,
height: ITEM_DISPLAY_HEIGHT });
this.actor._delegate = this;
this.actor.connect('button-release-event',
Lang.bind(this,
function() {
// Activates the item by launching it
this.emit('activate');
return true;
}));
let draggable = DND.makeDraggable(this.actor);
draggable.connect('drag-begin', Lang.bind(this, this._onDragBegin));
this._bg = new Big.Box({ background_color: ITEM_DISPLAY_BACKGROUND_COLOR,
corner_radius: 4,
x: 0, y: 0,
width: availableWidth, height: ITEM_DISPLAY_HEIGHT });
this.actor.add_actor(this._bg);
let global = Shell.Global.get();
let infoIconUri = "file://" + global.imagedir + "info.svg";
let infoIcon = Shell.TextureCache.get_default().load_uri_sync(infoIconUri,
INFORMATION_BUTTON_SIZE,
INFORMATION_BUTTON_SIZE);
this._informationButton = new Button.iconButton(this.actor, INFORMATION_BUTTON_SIZE, infoIcon);
this._informationButton.actor.x = availableWidth - ITEM_DISPLAY_PADDING_RIGHT - INFORMATION_BUTTON_SIZE;
this._informationButton.actor.y = ITEM_DISPLAY_HEIGHT / 2 - INFORMATION_BUTTON_SIZE / 2;
// Connecting to the button-press-event for the information button ensures that the actor,
// which is a draggable actor, does not get the button-press-event and doesn't initiate
// the dragging, which then prevents us from getting the button-release-event for the button.
this._informationButton.actor.connect('button-press-event',
Lang.bind(this,
function() {
return true;
}));
this._informationButton.actor.connect('button-release-event',
Lang.bind(this,
function() {
// Selects the item by highlighting it and displaying its details
this.emit('select');
return true;
}));
this.actor.add_actor(this._informationButton.actor);
this._informationButton.actor.lower_bottom();
this._name = null;
this._description = null;
this._icon = null;
this._previewIcon = null;
this.dragActor = null;
},
//// Draggable object interface ////
// Returns a cloned texture of the item's icon to represent the item as it
// is being dragged.
getDragActor: function(stageX, stageY) {
this.dragActor = this._createIcon();
// If the user dragged from the icon itself, then position
// the dragActor over the original icon. Otherwise center it
// around the pointer
let [iconX, iconY] = this._icon.get_transformed_position();
let [iconWidth, iconHeight] = this._icon.get_transformed_size();
if (stageX > iconX && stageX <= iconX + iconWidth &&
stageY > iconY && stageY <= iconY + iconHeight)
this.dragActor.set_position(iconX, iconY);
else
this.dragActor.set_position(stageX - this.dragActor.width / 2, stageY - this.dragActor.height / 2);
return this.dragActor;
},
// Returns the item icon, a separate copy of which is used to
// represent the item as it is being dragged. This is used to
// determine a snap-back location for the drag icon if it does
// not get accepted by any drop target.
getDragActorSource: function() {
return this._icon;
},
//// Public methods ////
// Shows the information button when the item was drawn under the mouse pointer.
onDrawnUnderPointer: function() {
this._informationButton.show();
},
// Highlights the item by setting a different background color than the default
// if isSelected is true, removes the highlighting otherwise.
markSelected: function(isSelected) {
let color;
if (isSelected) {
color = ITEM_DISPLAY_SELECTED_BACKGROUND_COLOR;
this._informationButton.forceShow(true);
}
else {
color = ITEM_DISPLAY_BACKGROUND_COLOR;
this._informationButton.forceShow(false);
}
this._bg.background_color = color;
},
/*
* Returns an actor containing item details. In the future details can have more information than what
* the preview pop-up has and be item-type specific.
*
* availableWidth - width available for displaying details
* availableHeight - height available for displaying details
*/
createDetailsActor: function(availableWidth, availableHeight) {
let details = new Big.Box({ orientation: Big.BoxOrientation.VERTICAL,
spacing: PREVIEW_BOX_SPACING,
width: availableWidth });
let mainDetails = new Big.Box({ orientation: Big.BoxOrientation.HORIZONTAL,
spacing: PREVIEW_BOX_SPACING,
width: availableWidth });
// Inner box with name and description
let textDetails = new Big.Box({ orientation: Big.BoxOrientation.VERTICAL,
spacing: PREVIEW_BOX_SPACING });
let detailsName = new Clutter.Text({ color: ITEM_DISPLAY_NAME_COLOR,
font_name: "Sans bold 14px",
line_wrap: true,
text: this._name.text});
textDetails.append(detailsName, Big.BoxPackFlags.NONE);
let detailsDescription = new Clutter.Text({ color: ITEM_DISPLAY_NAME_COLOR,
font_name: "Sans 14px",
line_wrap: true,
text: this._description.text });
textDetails.append(detailsDescription, Big.BoxPackFlags.NONE);
mainDetails.append(textDetails, Big.BoxPackFlags.EXPAND);
this._ensurePreviewIconCreated();
let largePreviewIcon = this._createLargePreviewIcon(availableWidth, Math.max(0, availableHeight - mainDetails.height - PREVIEW_BOX_SPACING));
if (this._previewIcon != null && largePreviewIcon == null) {
let previewIconClone = new Clutter.Clone({ source: this._previewIcon });
mainDetails.prepend(previewIconClone, Big.BoxPackFlags.NONE);
}
details.append(mainDetails, Big.BoxPackFlags.NONE);
if (largePreviewIcon != null) {
let largePreview = new Big.Box({ orientation: Big.BoxOrientation.HORIZONTAL });
largePreview.append(largePreviewIcon, Big.BoxPackFlags.NONE);
details.append(largePreview, Big.BoxPackFlags.NONE);
}
return details;
},
// Destoys the item.
destroy: function() {
this.actor.destroy();
},
//// Pure virtual public methods ////
// Performes an action associated with launching this item, such as opening a file or an application.
launch: function() {
throw new Error("Not implemented");
},
//// Protected methods ////
/*
* Creates the graphical elements for the item based on the item information.
*
* nameText - name of the item
* descriptionText - short description of the item
*/
_setItemInfo: function(nameText, descriptionText) {
if (this._name != null) {
// this also removes this._name from the parent container,
// so we don't need to call this.actor.remove_actor(this._name) directly
this._name.destroy();
this._name = null;
}
if (this._description != null) {
this._description.destroy();
this._description = null;
}
if (this._icon != null) {
// though we get the icon from elsewhere, we assume its ownership here,
// and therefore should be responsible for distroying it
this._icon.destroy();
this._icon = null;
}
// This ensures we'll create a new previewIcon next time we need it
if (this._previewIcon != null) {
this._previewIcon.destroy();
this._previewIcon = null;
}
this._icon = this._createIcon();
this.actor.add_actor(this._icon);
let textWidth = this._availableWidth - (ITEM_DISPLAY_ICON_SIZE + 4) - INFORMATION_BUTTON_SIZE - ITEM_DISPLAY_PADDING_RIGHT;
this._name = new Clutter.Text({ color: ITEM_DISPLAY_NAME_COLOR,
font_name: "Sans 14px",
width: textWidth,
ellipsize: Pango.EllipsizeMode.END,
text: nameText,
x: ITEM_DISPLAY_ICON_SIZE + 4,
y: ITEM_DISPLAY_PADDING_TOP });
this.actor.add_actor(this._name);
this._description = new Clutter.Text({ color: ITEM_DISPLAY_DESCRIPTION_COLOR,
font_name: "Sans 12px",
width: textWidth,
ellipsize: Pango.EllipsizeMode.END,
text: descriptionText ? descriptionText : "",
x: this._name.x,
y: this._name.height + 4 });
this.actor.add_actor(this._description);
},
//// Virtual protected methods ////
// Creates and returns a large preview icon, but only if we have a detailed image.
_createLargePreviewIcon : function(availableWidth, availableHeight) {
return null;
},
//// Pure virtual protected methods ////
// Returns an icon for the item.
_createIcon: function() {
throw new Error("Not implemented");
},
// Ensures the preview icon is created.
_ensurePreviewIconCreated: function() {
throw new Error("Not implemented");
},
//// Private methods ////
// Hides the information button once the item starts being dragged.
_onDragBegin : function (draggable, time) {
// For some reason, we are not getting leave-event signal when we are dragging an item,
// so we should remove the link manually.
this._informationButton.actor.hide();
}
};
Signals.addSignalMethods(GenericDisplayItem.prototype);
/* This is a virtual class that represents a display containing a collection of items
* that can be filtered with a search string.
*
* width - width available for the display
*/
function GenericDisplay(width) {
this._init(width);
}
GenericDisplay.prototype = {
_init : function(width) {
this._search = '';
this._expanded = false;
this._width = width;
this._maxItemsPerPage = null;
this._list = new Shell.OverflowList({ width: this._width,
spacing: 6.0,
item_height: ITEM_DISPLAY_HEIGHT });
this._list.connect('notify::n-pages', Lang.bind(this, function (grid, alloc) {
this._updateDisplayControl(true);
}));
this._list.connect('notify::page', Lang.bind(this, function (grid, alloc) {
this._updateDisplayControl(false);
}));
// map<itemId, Object> where Object represents the item info
this._allItems = {};
// an array of itemIds of items that match the current request
// in the order in which the items should be displayed
this._matchedItems = [];
// map<itemId, GenericDisplayItem>
this._displayedItems = {};
this._displayedItemsCount = 0;
this._selectedIndex = -1;
// These two are public - .actor is the normal "actor subclass" property,
// but we also expose a .displayControl actor which is separate.
// See also getSideArea.
this.actor = this._list;
this.displayControl = new Big.Box({ background_color: ITEM_DISPLAY_BACKGROUND_COLOR,
spacing: 12,
orientation: Big.BoxOrientation.HORIZONTAL});
this._availableWidthForItemDetails = width;
this.selectedItemDetails = new Big.Box({});
},
//// Public methods ////
// Sets dimensions available for the item details display.
setAvailableDimensionsForItemDetails: function(availableWidth, availableHeight) {
this._availableWidthForItemDetails = availableWidth;
this._availableHeightForItemDetails = availableHeight;
},
// Returns dimensions available for the item details display.
getAvailableDimensionsForItemDetails: function() {
return [this._availableWidthForItemDetails, this._availableHeightForItemDetails];
},
// Sets the search string and displays the matching items.
setSearch: function(text) {
this._search = text.toLowerCase();
this._redisplay(true);
},
// Launches the item that is currently selected and emits 'activated' signal.
activateSelected: function() {
if (this._selectedIndex != -1) {
let selected = this._findDisplayedByIndex(this._selectedIndex);
selected.launch()
this.emit('activated');
}
},
// Moves the selection one up. If the selection was already on the top item, it's moved
// to the bottom one. Returns true if the selection actually moved up, false if it wrapped
// around to the bottom.
selectUp: function() {
let selectedUp = true;
let prev = this._selectedIndex - 1;
if (this._selectedIndex <= 0) {
prev = this._displayedItemsCount - 1;
selectedUp = false;
}
this._selectIndex(prev);
return selectedUp;
},
// Moves the selection one down. If the selection was already on the bottom item, it's moved
// to the top one. Returns true if the selection actually moved down, false if it wrapped
// around to the top.
selectDown: function() {
let selectedDown = true;
let next = this._selectedIndex + 1;
if (this._selectedIndex == this._displayedItemsCount - 1) {
next = 0;
selectedDown = false;
}
this._selectIndex(next);
return selectedDown;
},
// Selects the first item among the displayed items.
selectFirstItem: function() {
if (this.hasItems())
this._selectIndex(0);
},
// Selects the last item among the displayed items.
selectLastItem: function() {
if (this.hasItems())
this._selectIndex(this._displayedItemsCount - 1);
},
// Returns true if the display has some item selected.
hasSelected: function() {
return this._selectedIndex != -1;
},
// Removes selection if some display item is selected.
unsetSelected: function() {
this._selectIndex(-1);
},
// Returns true if the display has any displayed items.
hasItems: function() {
return this._displayedItemsCount > 0;
},
// Updates the displayed items and makes the display actor visible.
show: function() {
this._list.show();
this._redisplay(true);
},
// Hides the display actor.
hide: function() {
this._list.hide();
this._filterReset();
this._removeAllDisplayItems();
},
// Returns an actor which acts as a sidebar; this is used for
// the applications category view
getSideArea: function () {
return null;
},
//// Protected methods ////
/*
* Displays items that match the current request and should show up on the current page.
* Updates the display control to reflect the matched items set and the page selected.
*
* resetDisplayControl - indicates if the display control should be re-created because
* the results or the space allocated for them changed. If it's false,
* the existing display control is used and only the page links are
* updated to reflect the current page selection.
*/
_displayMatchedItems: function(resetDisplayControl) {
// When generating a new list to display, we first remove all the old
// displayed items which will unset the selection. So we need
// to keep a flag which indicates if this display had the selection.
let hadSelected = this.hasSelected();
this._removeAllDisplayItems();
for (let i = 0; i < this._matchedItems.length; i++) {
this._addDisplayItem(this._matchedItems[i]);
}
if (hadSelected) {
this._selectedIndex = -1;
this.selectFirstItem();
}
// We currently redisplay matching items and raise the sideshow as part of two different callbacks.
// Checking what is under the pointer after a timeout allows us to not merge these callbacks into one, at least for now.
Mainloop.timeout_add(5,
Lang.bind(this,
function() {
// Check if the pointer is over one of the items and display the information button if it is.
let [child, x, y, mask] = Gdk.Screen.get_default().get_root_window().get_pointer();
let global = Shell.Global.get();
let actor = global.stage.get_actor_at_pos(Clutter.PickMode.REACTIVE,
x, y);
if (actor != null) {
let item = this._findDisplayedByActor(actor);
if (item != null) {
item.onDrawnUnderPointer();
}
}
return false;
}));
},
// Creates a display item based on the information associated with itemId
// and adds it to the displayed items.
_addDisplayItem : function(itemId) {
if (this._displayedItems.hasOwnProperty(itemId)) {
log("Tried adding a display item for " + itemId + ", but an item with this item id is already among displayed items.");
return;
}
let itemInfo = this._allItems[itemId];
let displayItem = this._createDisplayItem(itemInfo, this._width);
displayItem.connect('activate',
Lang.bind(this,
function() {
// update the selection
this._selectIndex(this._getIndexOfDisplayedActor(displayItem.actor));
this.activateSelected();
}));
displayItem.connect('select',
Lang.bind(this,
function() {
// update the selection
this._selectIndex(this._getIndexOfDisplayedActor(displayItem.actor));
}));
this._list.add_actor(displayItem.actor);
this._displayedItems[itemId] = displayItem;
this._displayedItemsCount++;
},
// Removes an item identifed by the itemId from the displayed items.
_removeDisplayItem: function(itemId) {
let displayItem = this._displayedItems[itemId];
let displayItemIndex = this._getIndexOfDisplayedActor(displayItem.actor);
if (this.hasSelected() && (this._displayedItemsCount == 1 || !this._list.visible)) {
this.unsetSelected();
} else if (this.hasSelected() && displayItemIndex < this._selectedIndex) {
this.selectUp();
}
displayItem.destroy();
delete this._displayedItems[itemId];
this._displayedItemsCount--;
},
// Removes all displayed items.
_removeAllDisplayItems: function() {
this.unsetSelected();
for (itemId in this._displayedItems)
this._removeDisplayItem(itemId);
},
// Return true if there's an active search or other constraint
// on the list
_filterActive: function() {
return this._search != "";
},
// Called when we are resetting state
_filterReset: function() {
this.unsetSelected();
},
/*
* Updates the displayed items, applying the search string if one exists.
*
* resetPage - indicates if the page selection should be reset when displaying the matching results.
* We reset the page selection when the change in results was initiated by the user by
* entering a different search criteria or by viewing the results list in a different
* size mode, but we keep the page selection the same if the results got updated on
* their own while the user was browsing through the result pages.
*/
_redisplay: function(resetPage) {
if (!this._list.visible)
return;
this._refreshCache();
if (!this._filterActive())
this._setDefaultList();
else
this._doSearchFilter();
if (resetPage)
this._list.page = 0;
this._displayMatchedItems(true);
this.emit('redisplayed');
},
//// Pure virtual protected methods ////
// Performs the steps needed to have the latest information about the items.
_refreshCache: function() {
throw new Error("Not implemented");
},
// Sets the list of the displayed items based on the default sorting order.
// The default sorting order is specific to each implementing class.
_setDefaultList: function() {
throw new Error("Not implemented");
},
// Compares items associated with the item ids based on the order in which the
// items should be displayed.
// Intended to be used as a compareFunction for array.sort().
// Returns an integer value indicating the result of the comparison.
_compareItems: function(itemIdA, itemIdB) {
throw new Error("Not implemented");
},
// Checks if the item info can be a match for the search string.
// Returns a boolean flag indicating if that's the case.
_isInfoMatching: function(itemInfo, search) {
throw new Error("Not implemented");
},
// Creates a display item based on itemInfo.
_createDisplayItem: function(itemInfo) {
throw new Error("Not implemented");
},
//// Private methods ////
_getSearchMatchedItems: function() {
let matchedItemsForSearch = {};
// Break the search up into terms, and search for each
// individual term. Keep track of the number of terms
// each item matched.
let terms = this._search.split(/\s+/);
for (let i = 0; i < terms.length; i++) {
let term = terms[i];
for (itemId in this._allItems) {
let item = this._allItems[itemId];
if (this._isInfoMatching(item, term)) {
let count = matchedItemsForSearch[itemId];
if (!count)
count = 0;
count += 1;
matchedItemsForSearch[itemId] = count;
}
}
}
return matchedItemsForSearch;
},
// Applies the search string to the list of items to find matches,
// and displays the matching items.
_doSearchFilter: function() {
let matchedItemsForSearch;
if (this._filterActive()) {
matchedItemsForSearch = this._getSearchMatchedItems();
} else {
matchedItemsForSearch = {};
for (let itemId in this._allItems) {
matchedItemsForSearch[itemId] = 1;
}
}
this._matchedItems = [];
for (itemId in matchedItemsForSearch) {
this._matchedItems.push(itemId);
}
this._matchedItems.sort(Lang.bind(this, function (a, b) {
let countA = matchedItemsForSearch[a];
let countB = matchedItemsForSearch[b];
if (countA > countB)
return -1;
else if (countA < countB)
return 1;
else
return this._compareItems(a, b);
}));
},
// Displays the page specified by the pageNumber argument.
_displayPage: function(pageNumber) {
this._list.page = pageNumber;
},
/*
* Updates the display control to reflect the matched items set and the page selected.
*
* resetDisplayControl - indicates if the display control should be re-created because
* the results or the space allocated for them changed. If it's false,
* the existing display control is used and only the page links are
* updated to reflect the current page selection.
*/
_updateDisplayControl: function(resetDisplayControl) {
if (resetDisplayControl) {
this.displayControl.remove_all();
let nPages = this._list.n_pages;
let pageNumber = this._list.page;
for (let i = 0; i < nPages; i++) {
let pageControl = new Link.Link({ color: (i == pageNumber) ? DISPLAY_CONTROL_SELECTED_COLOR : ITEM_DISPLAY_DESCRIPTION_COLOR,
font_name: "Sans Bold 16px",
text: (i+1) + "",
height: LABEL_HEIGHT,
reactive: (i == pageNumber) ? false : true});
this.displayControl.append(pageControl.actor, Big.BoxPackFlags.NONE);
// we use pageNumberLocalScope to get the page number right in the callback function
let pageNumberLocalScope = i;
pageControl.connect('clicked',
Lang.bind(this,
function(o, event) {
this._displayPage(pageNumberLocalScope);
}));
}
} else {
let pageControlActors = this.displayControl.get_children();
for (let i = 0; i < pageControlActors.length; i++) {
let pageControlActor = pageControlActors[i];
if (i == this._list.page) {
pageControlActor.color = DISPLAY_CONTROL_SELECTED_COLOR;
pageControlActor.reactive = false;
} else {
pageControlActor.color = ITEM_DISPLAY_DESCRIPTION_COLOR;
pageControlActor.reactive = true;
}
}
}
},
// Returns a display item based on its index in the ordering of the
// display children.
_findDisplayedByIndex: function(index) {
let displayedActors = this._list.get_children();
let actor = displayedActors[index];
return this._findDisplayedByActor(actor);
},
// Returns a display item based on the actor that represents it in
// the display.
_findDisplayedByActor: function(actor) {
for (itemId in this._displayedItems) {
let item = this._displayedItems[itemId];
if (item.actor == actor) {
return item;
}
}
return null;
},
// Returns and index that the actor has in the ordering of the display's
// children.
_getIndexOfDisplayedActor: function(actor) {
let children = this._list.get_children();
for (let i = 0; i < children.length; i++) {
if (children[i] == actor)
return i;
}
return -1;
},
// Selects (e.g. highlights) a display item at the provided index,
// updates this.selectedItemDetails actor, and emits 'selected' signal.
_selectIndex: function(index) {
if (this._selectedIndex != -1) {
let prev = this._findDisplayedByIndex(this._selectedIndex);
prev.markSelected(false);
// Calling destroy() gets large image previews released as quickly as
// possible, if we just removed them, they might hang around for a while
// until the actor was garbage collected.
let children = this.selectedItemDetails.get_children();
for (let i = 0; i < children.length; i++)
children[i].destroy();
this.selectedItemDetails.remove_all();
}
this._selectedIndex = index;
if (index != -1 && index < this._displayedItemsCount) {
let item = this._findDisplayedByIndex(index);
item.markSelected(true);
this.selectedItemDetails.append(item.createDetailsActor(this._availableWidthForItemDetails, this._availableHeightForItemDetails), Big.BoxPackFlags.NONE);
this.emit('selected');
}
}
};
Signals.addSignalMethods(GenericDisplay.prototype);