gnome-shell/js/ui/docDisplay.js
Colin Walters d024dbd779 Bug 582248 - Async loading of pixbufs and icon caching
Add a ShellTextureCache class which loads (and can cache)
pixmap->texture conversions.  This fixes a problem with the
async code in ClutterTexture that it was lower priority
than animations, and also ensures we're really only
loading these pixbufs once in the icon case.
2009-05-20 11:22:56 -04:00

256 lines
12 KiB
JavaScript

/* -*- mode: js2; js2-basic-offset: 4; indent-tabs-mode: nil -*- */
const Clutter = imports.gi.Clutter;
const Gio = imports.gi.Gio;
const Gtk = imports.gi.Gtk;
const Lang = imports.lang;
const Shell = imports.gi.Shell;
const Signals = imports.signals;
const GenericDisplay = imports.ui.genericDisplay;
const Main = imports.ui.main;
const ITEM_DISPLAY_ICON_MARGIN = 2;
/* This class represents a single display item containing information about a document.
*
* docInfo - GtkRecentInfo object containing information about the document
* availableWidth - total width available for the item
*/
function DocDisplayItem(docInfo, availableWidth) {
this._init(docInfo, availableWidth);
}
DocDisplayItem.prototype = {
__proto__: GenericDisplay.GenericDisplayItem.prototype,
_init : function(docInfo, availableWidth) {
GenericDisplay.GenericDisplayItem.prototype._init.call(this, availableWidth);
this._docInfo = docInfo;
let name = docInfo.get_display_name();
// we can possibly display tags in the space for description in the future
let description = "";
let icon = new Clutter.Texture();
this._iconPixbuf = Shell.get_thumbnail_for_recent_info(docInfo);
if (this._iconPixbuf) {
// We calculate the width and height of the texture so as to preserve the aspect ratio of the thumbnail.
// Because the images generated based on thumbnails don't have an internal padding like system icons do,
// we create a slightly smaller texture and then use extra margin when positioning it.
let scalingFactor = (GenericDisplay.ITEM_DISPLAY_ICON_SIZE - ITEM_DISPLAY_ICON_MARGIN * 2) / Math.max(this._iconPixbuf.get_width(), this._iconPixbuf.get_height());
icon.set_width(Math.ceil(this._iconPixbuf.get_width() * scalingFactor));
icon.set_height(Math.ceil(this._iconPixbuf.get_height() * scalingFactor));
Shell.clutter_texture_set_from_pixbuf(icon, this._iconPixbuf);
icon.x = GenericDisplay.ITEM_DISPLAY_PADDING + ITEM_DISPLAY_ICON_MARGIN;
icon.y = GenericDisplay.ITEM_DISPLAY_PADDING + ITEM_DISPLAY_ICON_MARGIN;
} else {
Shell.clutter_texture_set_from_pixbuf(icon, docInfo.get_icon(GenericDisplay.ITEM_DISPLAY_ICON_SIZE));
icon.x = GenericDisplay.ITEM_DISPLAY_PADDING;
icon.y = GenericDisplay.ITEM_DISPLAY_PADDING;
}
this._setItemInfo(name, description, icon);
},
//// Public methods ////
// Returns the document info associated with this display item.
getDocInfo : function() {
return this._docInfo;
},
//// Public method overrides ////
// Opens a document represented by this display item.
launch : function() {
// While using Gio.app_info_launch_default_for_uri() would be shorter
// in terms of lines of code, we are not doing so because that would
// duplicate the work of retrieving the mime type.
let mimeType = this._docInfo.get_mime_type();
let appInfo = Gio.app_info_get_default_for_type(mimeType, true);
if (appInfo != null) {
appInfo.launch_uris([this._docInfo.get_uri()], Main.createAppLaunchContext());
} else {
log("Failed to get default application info for mime type " + mimeType +
". Will try to use the last application that registered the document.");
let appName = this._docInfo.last_application();
let [success, appExec, count, time] = this._docInfo.get_application_info(appName);
if (success) {
log("Will open a document with the following command: " + appExec);
// TODO: Change this once better support for creating GAppInfo is added to
// GtkRecentInfo, as right now this relies on the fact that the file uri is
// already a part of appExec, so we don't supply any files to appInfo.launch().
// The 'command line' passed to create_from_command_line is allowed to contain
// '%<something>' macros that are expanded to file name / icon name, etc,
// so we need to escape % as %%
appExec = appExec.replace(/%/g, "%%");
let appInfo = Gio.app_info_create_from_commandline(appExec, null, 0, null);
// The point of passing an app launch context to launch() is mostly to get
// startup notification and associated benefits like the app appearing
// on the right desktop; but it doesn't really work for now because with
// the way we create the appInfo we aren't reading the application's desktop
// file, and thus don't find the StartupNotify=true in it. So, despite passing
// the app launch context, no startup notification occurs.
appInfo.launch([], Main.createAppLaunchContext());
} else {
log("Failed to get application info for " + this._docInfo.get_uri());
}
}
},
//// Protected method overrides ////
// Ensures the preview icon is created.
_ensurePreviewIconCreated : function() {
if (this._previewIcon)
return;
this._previewIcon = new Clutter.Texture();
if (this._iconPixbuf) {
let scalingFactor = (GenericDisplay.PREVIEW_ICON_SIZE / Math.max(this._iconPixbuf.get_width(), this._iconPixbuf.get_height()));
this._previewIcon.set_width(Math.ceil(this._iconPixbuf.get_width() * scalingFactor));
this._previewIcon.set_height(Math.ceil(this._iconPixbuf.get_height() * scalingFactor));
Shell.clutter_texture_set_from_pixbuf(this._previewIcon, this._iconPixbuf);
} else {
Shell.clutter_texture_set_from_pixbuf(this._previewIcon, this._docInfo.get_icon(GenericDisplay.PREVIEW_ICON_SIZE));
}
},
// Creates and returns a large preview icon, but only if this._docInfo is an image file
// and we were able to generate a pixbuf from it successfully.
_createLargePreviewIcon : function(availableWidth, availableHeight) {
if (this._docInfo.get_mime_type() == null || this._docInfo.get_mime_type().indexOf("image/") != 0)
return null;
return Shell.TextureCache.load_uri_sync(this._docInfo.get_uri(), availableWidth, availableHeight);
}
};
/* This class represents a display containing a collection of document items.
* The documents are sorted by how recently they were last visited.
*
* width - width available for the display
* height - height available for the display
*/
function DocDisplay(width, height, numberOfColumns, columnGap) {
this._init(width, height, numberOfColumns, columnGap);
}
DocDisplay.prototype = {
__proto__: GenericDisplay.GenericDisplay.prototype,
_init : function(width, height, numberOfColumns, columnGap) {
GenericDisplay.GenericDisplay.prototype._init.call(this, width, height, numberOfColumns, columnGap);
let me = this;
this._recentManager = Gtk.RecentManager.get_default();
this._docsStale = true;
this._recentManager.connect('changed', function(recentManager, userData) {
me._docsStale = true;
// Changes in local recent files should not happen when we are in the overlay mode,
// but redisplaying right away is cool when we use Zephyr.
// Also, we might be displaying remote documents, like Google Docs, in the future
// which might be edited by someone else.
me._redisplay(false);
});
},
//// Protected method overrides ////
// Gets the list of recent items from the recent items manager.
_refreshCache : function() {
let me = this;
if (!this._docsStale)
return;
this._allItems = {};
let docs = this._recentManager.get_items();
for (let i = 0; i < docs.length; i++) {
let docInfo = docs[i];
let docId = docInfo.get_uri();
// we use GtkRecentInfo URI as an item Id
this._allItems[docId] = docInfo;
}
this._docsStale = false;
},
// Sets the list of the displayed items based on how recently they were last visited.
_setDefaultList : function() {
// It seems to be an implementation detail of the Mozilla JavaScript that object
// properties are returned during the iteration in the same order in which they were
// defined, but it is not a guarantee according to this
// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Statements/for...in
// While this._allItems associative array seems to always be ordered by last added,
// as the results of this._recentManager.get_items() based on which it is constructed are,
// we should do the sorting manually because we want the order to be based on last visited.
//
// This function is called each time the search string is set back to '' or we display
// the overlay, so we are doing the sorting over the same items multiple times if the list
// of recent items didn't change. We could store an additional array of doc ids and sort
// them once when they are returned by this._recentManager.get_items() to avoid having to do
// this sorting each time, but the sorting seems to be very fast anyway, so there is no need
// to introduce an additional class variable.
this._matchedItems = [];
let docIdsToRemove = [];
for (docId in this._allItems) {
// this._allItems[docId].exists() checks if the resource still exists
if (this._allItems[docId].exists())
this._matchedItems.push(docId);
else
docIdsToRemove.push(docId);
}
for (docId in docIdsToRemove) {
delete this._allItems[docId];
}
this._matchedItems.sort(Lang.bind(this, function (a,b) { return this._compareItems(a,b); }));
},
// Compares items associated with the item ids based on how recently the items
// were last visited.
// Returns an integer value indicating the result of the comparison.
_compareItems : function(itemIdA, itemIdB) {
let docA = this._allItems[itemIdA];
let docB = this._allItems[itemIdB];
// We actually used get_modified() instead of get_visited() here, as GtkRecentInfo
// doesn't updated get_visited() correctly.
// See http://bugzilla.gnome.org/show_bug.cgi?id=567094
if (docA.get_modified() > docB.get_modified())
return -1;
else if (docA.get_modified() < docB.get_modified())
return 1;
else
return 0;
},
// Checks if the item info can be a match for the search string by checking
// the name of the document. Item info is expected to be GtkRecentInfo.
// Returns a boolean flag indicating if itemInfo is a match.
_isInfoMatching : function(itemInfo, search) {
if (!itemInfo.exists())
return false;
if (search == null || search == '')
return true;
let name = itemInfo.get_display_name().toLowerCase();
if (name.indexOf(search) >= 0)
return true;
// TODO: we can also check doc URIs, so that
// if you search for a directory name, we display recent files from it
return false;
},
// Creates a DocDisplayItem based on itemInfo, which is expected be a GtkRecentInfo object.
_createDisplayItem: function(itemInfo) {
return new DocDisplayItem(itemInfo, this._columnWidth);
}
};
Signals.addSignalMethods(DocDisplay.prototype);