gala/lib/Utils.vala
2018-03-11 19:26:03 +01:00

397 lines
12 KiB
Vala

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