mirror of
https://github.com/elementary/gala.git
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397 lines
12 KiB
Vala
397 lines
12 KiB
Vala
//
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// Copyright (C) 2012 Tom Beckmann, Rico Tzschichholz
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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namespace Gala
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{
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public class Utils
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{
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// Cache xid:pixbuf and icon:pixbuf pairs to provide a faster way aquiring icons
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static HashTable<string, Gdk.Pixbuf> xid_pixbuf_cache;
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static HashTable<string, Gdk.Pixbuf> icon_pixbuf_cache;
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static uint cache_clear_timeout = 0;
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static Gdk.Pixbuf? close_pixbuf = null;
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static Gdk.Pixbuf? resize_pixbuf = null;
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static construct
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{
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xid_pixbuf_cache = new HashTable<string, Gdk.Pixbuf> (str_hash, str_equal);
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icon_pixbuf_cache = new HashTable<string, Gdk.Pixbuf> (str_hash, str_equal);
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}
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Utils ()
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{
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}
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/**
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* Clean icon caches
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*/
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static void clean_icon_cache (uint32[] xids)
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{
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var list = xid_pixbuf_cache.get_keys ();
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var pixbuf_list = icon_pixbuf_cache.get_values ();
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var icon_list = icon_pixbuf_cache.get_keys ();
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foreach (var xid_key in list) {
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var xid = (uint32)uint64.parse (xid_key.split ("::")[0]);
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if (!(xid in xids)) {
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var pixbuf = xid_pixbuf_cache.get (xid_key);
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for (var j = 0; j < pixbuf_list.length (); j++) {
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if (pixbuf_list.nth_data (j) == pixbuf) {
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xid_pixbuf_cache.remove (icon_list.nth_data (j));
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}
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}
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xid_pixbuf_cache.remove (xid_key);
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}
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}
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}
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/**
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* Marks the given xids as no longer needed, the corresponding icons
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* may be freed now. Mainly for internal purposes.
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*
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* @param xids The xids of the window that no longer need icons
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*/
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public static void request_clean_icon_cache (uint32[] xids)
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{
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if (cache_clear_timeout > 0)
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GLib.Source.remove (cache_clear_timeout);
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cache_clear_timeout = Timeout.add_seconds (30, () => {
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cache_clear_timeout = 0;
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Idle.add (() => {
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clean_icon_cache (xids);
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return false;
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});
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return false;
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});
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}
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/**
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* Returns a pixbuf for the application of this window or a default icon
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*
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* @param window The window to get an icon for
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* @param size The size of the icon
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* @param scale The desired scale of the icon
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* @param ignore_cache Should not be necessary in most cases, if you care about the icon
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* being loaded correctly, you should consider using the WindowIcon class
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*/
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public static Gdk.Pixbuf get_icon_for_window (Meta.Window window, int size, int scale = 1, bool ignore_cache = false)
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{
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return get_icon_for_xid ((uint32)window.get_xwindow (), size, scale, ignore_cache);
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}
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/**
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* Returns a pixbuf for a given xid or a default icon
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*
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* @see get_icon_for_window
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*/
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public static Gdk.Pixbuf get_icon_for_xid (uint32 xid, int size, int scale = 1, bool ignore_cache = false)
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{
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Gdk.Pixbuf? result = null;
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var xid_key = "%u::%i".printf (xid, size);
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if (!ignore_cache && (result = xid_pixbuf_cache.get (xid_key)) != null)
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return result;
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var app = Bamf.Matcher.get_default ().get_application_for_xid (xid);
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result = get_icon_for_application (app, size, scale, ignore_cache);
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xid_pixbuf_cache.set (xid_key, result);
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return result;
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}
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/**
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* Returns a pixbuf for this application or a default icon
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*
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* @see get_icon_for_window
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*/
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static Gdk.Pixbuf get_icon_for_application (Bamf.Application? app, int size, int scale = 1,
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bool ignore_cache = false)
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{
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Gdk.Pixbuf? image = null;
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bool not_cached = false;
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string? icon = null;
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string? icon_key = null;
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if (app != null && app.get_desktop_file () != null) {
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var appinfo = new DesktopAppInfo.from_filename (app.get_desktop_file ());
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if (appinfo != null) {
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icon = Plank.DrawingService.get_icon_from_gicon (appinfo.get_icon ());
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icon_key = "%s::%i::%i".printf (icon, size, scale);
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if (ignore_cache || (image = icon_pixbuf_cache.get (icon_key)) == null) {
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var scaled_size = size * scale;
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var surface = Plank.DrawingService.load_icon_for_scale (icon, scaled_size, scaled_size, scale);
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image = Gdk.pixbuf_get_from_surface (surface, 0, 0, scaled_size, scaled_size);
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not_cached = true;
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}
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}
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}
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if (image == null) {
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try {
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unowned Gtk.IconTheme icon_theme = Gtk.IconTheme.get_default ();
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icon = "application-default-icon";
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icon_key = "%s::%i::%i".printf (icon, size, scale);
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if ((image = icon_pixbuf_cache.get (icon_key)) == null) {
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image = icon_theme.load_icon_for_scale (icon, size, scale, 0);
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not_cached = true;
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}
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} catch (Error e) {
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warning (e.message);
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}
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}
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if (image == null) {
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icon = "";
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icon_key = "::%i".printf (size);
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if ((image = icon_pixbuf_cache.get (icon_key)) == null) {
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image = new Gdk.Pixbuf (Gdk.Colorspace.RGB, true, 8, size, size);
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image.fill (0x00000000);
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not_cached = true;
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}
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}
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if (size * scale != image.width || size * scale != image.height)
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image = Plank.DrawingService.ar_scale (image, size * scale, size * scale);
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if (not_cached)
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icon_pixbuf_cache.set (icon_key, image);
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return image;
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}
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/**
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* Get the next window that should be active on a workspace right now. Based on
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* stacking order
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*
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* @param workspace The workspace on which to find the window
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* @param backward Whether to get the previous one instead
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*/
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public static Meta.Window get_next_window (Meta.Workspace workspace, bool backward = false)
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{
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var screen = workspace.get_screen ();
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var display = screen.get_display ();
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var window = display.get_tab_next (Meta.TabList.NORMAL,
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workspace, null, backward);
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if (window == null)
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window = display.get_tab_current (Meta.TabList.NORMAL, workspace);
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return window;
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}
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/**
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* Get the number of toplevel windows on a workspace excluding those that are
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* on all workspaces
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*
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* @param workspace The workspace on which to count the windows
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*/
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public static uint get_n_windows (Meta.Workspace workspace)
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{
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var n = 0;
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foreach (var window in workspace.list_windows ()) {
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if (window.is_on_all_workspaces ())
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continue;
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if (window.window_type == Meta.WindowType.NORMAL ||
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window.window_type == Meta.WindowType.DIALOG ||
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window.window_type == Meta.WindowType.MODAL_DIALOG)
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n ++;
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}
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return n;
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}
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/**
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* Creates an actor showing the current contents of the given WindowActor.
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*
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* @param actor The actor from which to create a shnapshot
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* @param inner_rect The inner (actually visible) rectangle of the window
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* @param outer_rect The outer (input region) rectangle of the window
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*
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* @return A copy of the actor at that time or %NULL
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*/
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public static Clutter.Actor? get_window_actor_snapshot (Meta.WindowActor actor, Meta.Rectangle inner_rect, Meta.Rectangle outer_rect)
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{
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var texture = actor.get_texture () as Meta.ShapedTexture;
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if (texture == null)
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return null;
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var surface = texture.get_image ({
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inner_rect.x - outer_rect.x,
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inner_rect.y - outer_rect.y,
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inner_rect.width,
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inner_rect.height
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});
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if (surface == null)
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return null;
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var canvas = new Clutter.Canvas ();
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var handler = canvas.draw.connect ((cr) => {
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cr.set_source_surface (surface, 0, 0);
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cr.paint ();
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return false;
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});
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canvas.set_size (inner_rect.width, inner_rect.height);
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SignalHandler.disconnect (canvas, handler);
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var container = new Clutter.Actor ();
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container.set_size (inner_rect.width, inner_rect.height);
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container.content = canvas;
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return container;
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}
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/**
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* Ring the system bell, will most likely emit a <beep> error sound or, if the
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* audible bell is disabled, flash the screen
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*
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* @param screen The screen to flash, if necessary
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*/
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public static void bell (Meta.Screen screen)
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{
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if (Meta.Prefs.bell_is_audible ())
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Gdk.beep ();
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else
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screen.get_display ().get_compositor ().flash_screen (screen);
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}
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/**
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* Returns the pixbuf that is used for close buttons throughout gala at a
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* size of 36px
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*
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* @return the close button pixbuf or null if it failed to load
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*/
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public static Gdk.Pixbuf? get_close_button_pixbuf ()
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{
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if (close_pixbuf == null) {
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#if HAS_MUTTER326
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var scale = Meta.Backend.get_backend ().get_settings ().get_ui_scaling_factor ();
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#else
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var scale = 1;
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#endif
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try {
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close_pixbuf = new Gdk.Pixbuf.from_resource_at_scale (Config.RESOURCEPATH + "/buttons/close.svg", -1, 36 * scale, true);
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} catch (Error e) {
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warning (e.message);
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return null;
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}
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}
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return close_pixbuf;
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}
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/**
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* Creates a new reactive ClutterActor at 36px with the close pixbuf
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*
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* @return The close button actor
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*/
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public static Clutter.Actor create_close_button ()
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{
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var texture = new Clutter.Texture ();
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var pixbuf = get_close_button_pixbuf ();
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texture.reactive = true;
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if (pixbuf != null) {
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try {
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texture.set_from_rgb_data (pixbuf.get_pixels (), pixbuf.get_has_alpha (),
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pixbuf.get_width (), pixbuf.get_height (),
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pixbuf.get_rowstride (), (pixbuf.get_has_alpha () ? 4 : 3), 0);
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} catch (Error e) {}
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} else {
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// we'll just make this red so there's at least something as an
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// indicator that loading failed. Should never happen and this
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// works as good as some weird fallback-image-failed-to-load pixbuf
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#if HAS_MUTTER326
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var scale = Meta.Backend.get_backend ().get_settings ().get_ui_scaling_factor ();
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#else
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var scale = 1;
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#endif
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texture.set_size (36 * scale, 36 * scale);
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texture.background_color = { 255, 0, 0, 255 };
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}
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return texture;
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}
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/**
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* Returns the pixbuf that is used for resize buttons throughout gala at a
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* size of 36px
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*
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* @return the close button pixbuf or null if it failed to load
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*/
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public static Gdk.Pixbuf? get_resize_button_pixbuf ()
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{
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if (resize_pixbuf == null) {
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#if HAS_MUTTER326
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var scale = Meta.Backend.get_backend ().get_settings ().get_ui_scaling_factor ();
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#else
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var scale = 1;
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#endif
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try {
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resize_pixbuf = new Gdk.Pixbuf.from_resource_at_scale (Config.RESOURCEPATH + "/buttons/resize.svg", -1, 36 * scale, true);
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} catch (Error e) {
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warning (e.message);
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return null;
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}
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}
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return resize_pixbuf;
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}
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/**
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* Creates a new reactive ClutterActor at 36px with the resize pixbuf
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*
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* @return The resize button actor
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*/
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public static Clutter.Actor create_resize_button ()
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{
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var texture = new Clutter.Texture ();
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var pixbuf = get_resize_button_pixbuf ();
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texture.reactive = true;
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if (pixbuf != null) {
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try {
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texture.set_from_rgb_data (pixbuf.get_pixels (), pixbuf.get_has_alpha (),
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pixbuf.get_width (), pixbuf.get_height (),
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pixbuf.get_rowstride (), (pixbuf.get_has_alpha () ? 4 : 3), 0);
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} catch (Error e) {}
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} else {
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// we'll just make this red so there's at least something as an
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// indicator that loading failed. Should never happen and this
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// works as good as some weird fallback-image-failed-to-load pixbuf
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#if HAS_MUTTER326
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var scale = Meta.Backend.get_backend ().get_settings ().get_ui_scaling_factor ();
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#else
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var scale = 1;
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#endif
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texture.set_size (36 * scale, 36 * scale);
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texture.background_color = { 255, 0, 0, 255 };
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}
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return texture;
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}
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}
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}
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