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accessibility.js
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accessibility.js
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// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
const Gio = imports.gi.Gio;
const Lang = imports.lang;
const PanelMenu = imports.ui.panelMenu;
const PopupMenu = imports.ui.popupMenu;
const A11Y_SCHEMA = 'org.gnome.desktop.a11y.keyboard';
const A11Y_MT_SCHEMA = 'org.gnome.desktop.a11y.mouse';
const KEY_STICKY_KEYS_ENABLED = 'stickykeys-enable';
const KEY_BOUNCE_KEYS_ENABLED = 'bouncekeys-enable';
const KEY_SLOW_KEYS_ENABLED = 'slowkeys-enable';
const KEY_MOUSE_KEYS_ENABLED = 'mousekeys-enable';
const DWELL_CLICK_ENABLED = 'dwell-click-enabled';
const APPLICATIONS_SCHEMA = 'org.gnome.desktop.a11y.applications';
const DPI_LOW_REASONABLE_VALUE = 50;
const DPI_HIGH_REASONABLE_VALUE = 500;
const DPI_FACTOR_LARGE = 1.25;
const DPI_FACTOR_LARGER = 1.5;
const DPI_FACTOR_LARGEST = 2.0;
const WM_SCHEMA = 'org.gnome.desktop.wm.preferences';
const KEY_VISUAL_BELL = 'visual-bell';
const DESKTOP_INTERFACE_SCHEMA = 'org.gnome.desktop.interface';
const KEY_GTK_THEME = 'gtk-theme';
const KEY_ICON_THEME = 'icon-theme';
const KEY_WM_THEME = 'theme';
const KEY_TEXT_SCALING_FACTOR = 'text-scaling-factor';
const HIGH_CONTRAST_THEME = 'HighContrast';
const ATIndicator = new Lang.Class({
Name: 'ATIndicator',
Extends: PanelMenu.SystemStatusButton,
_init: function() {
this.parent('preferences-desktop-accessibility-symbolic', _("Accessibility"));
let highContrast = this._buildHCItem();
this.menu.addMenuItem(highContrast);
let magnifier = this._buildItem(_("Zoom"), APPLICATIONS_SCHEMA,
'screen-magnifier-enabled');
this.menu.addMenuItem(magnifier);
this.menu.addMenuItem(this._buildFontItem());
let screenReader = this._buildItem(_("Screen Reader"), APPLICATIONS_SCHEMA,
'screen-reader-enabled');
this.menu.addMenuItem(screenReader);
let screenKeyboard = this._buildItem(_("Screen Keyboard"), APPLICATIONS_SCHEMA,
'screen-keyboard-enabled');
this.menu.addMenuItem(screenKeyboard);
let visualBell = this._buildItem(_("Visual Alerts"), WM_SCHEMA, KEY_VISUAL_BELL);
this.menu.addMenuItem(visualBell);
let stickyKeys = this._buildItem(_("Sticky Keys"), A11Y_SCHEMA, KEY_STICKY_KEYS_ENABLED);
this.menu.addMenuItem(stickyKeys);
let slowKeys = this._buildItem(_("Slow Keys"), A11Y_SCHEMA, KEY_SLOW_KEYS_ENABLED);
this.menu.addMenuItem(slowKeys);
let bounceKeys = this._buildItem(_("Bounce Keys"), A11Y_SCHEMA, KEY_BOUNCE_KEYS_ENABLED);
this.menu.addMenuItem(bounceKeys);
let mouseKeys = this._buildItem(_("Mouse Keys"), A11Y_SCHEMA, KEY_MOUSE_KEYS_ENABLED);
this.menu.addMenuItem(mouseKeys);
let hoverClick =this._buildItem(_("Hover Click"), A11Y_MT_SCHEMA, DWELL_CLICK_ENABLED);
this.menu.addMenuItem(hoverClick);
this.menu.addMenuItem(new PopupMenu.PopupSeparatorMenuItem());
this.menu.addSettingsAction(_("Universal Access Settings"), 'gnome-universal-access-panel.desktop');
},
_buildItemExtended: function(
string, initial_value, writable, on_set) {
let widget = new PopupMenu.PopupSwitchMenuItem(string, initial_value);
if (!writable)
widget.actor.reactive = false;
else
widget.connect('toggled', function(item) {
on_set(item.state);
});
return widget;
},
_buildItem: function(string, schema, key) {
let settings = new Gio.Settings({ schema: schema });
let widget = this._buildItemExtended(string,
settings.get_boolean(key),
settings.is_writable(key),
function(enabled) {
return settings.set_boolean(key, enabled);
});
settings.connect('changed::'+key, function() {
widget.setToggleState(settings.get_boolean(key));
});
return widget;
},
_buildHCItem: function() {
let interfaceSettings = new Gio.Settings({ schema: DESKTOP_INTERFACE_SCHEMA });
let wmSettings = new Gio.Settings({ schema: WM_SCHEMA });
let gtkTheme = interfaceSettings.get_string(KEY_GTK_THEME);
let iconTheme = interfaceSettings.get_string(KEY_ICON_THEME);
let wmTheme = wmSettings.get_string(KEY_WM_THEME);
let hasHC = (gtkTheme == HIGH_CONTRAST_THEME);
let highContrast = this._buildItemExtended(
_("High Contrast"),
hasHC,
interfaceSettings.is_writable(KEY_GTK_THEME) &&
interfaceSettings.is_writable(KEY_ICON_THEME) &&
wmSettings.is_writable(KEY_WM_THEME),
function (enabled) {
if (enabled) {
interfaceSettings.set_string(KEY_GTK_THEME, HIGH_CONTRAST_THEME);
interfaceSettings.set_string(KEY_ICON_THEME, HIGH_CONTRAST_THEME);
wmSettings.set_string(KEY_WM_THEME, HIGH_CONTRAST_THEME);
} else if(!hasHC) {
interfaceSettings.set_string(KEY_GTK_THEME, gtkTheme);
interfaceSettings.set_string(KEY_ICON_THEME, iconTheme);
wmSettings.set_string(KEY_WM_THEME, wmTheme);
} else {
interfaceSettings.reset(KEY_GTK_THEME);
interfaceSettings.reset(KEY_ICON_THEME);
wmSettings.reset(KEY_WM_THEME);
}
});
interfaceSettings.connect('changed::' + KEY_GTK_THEME, function() {
let value = interfaceSettings.get_string(KEY_GTK_THEME);
if (value == HIGH_CONTRAST_THEME) {
highContrast.setToggleState(true);
} else {
highContrast.setToggleState(false);
gtkTheme = value;
}
});
interfaceSettings.connect('changed::' + KEY_ICON_THEME, function() {
let value = interfaceSettings.get_string(KEY_ICON_THEME);
if (value != HIGH_CONTRAST_THEME)
iconTheme = value;
});
wmSettings.connect('changed::' + KEY_WM_THEME, function() {
let value = wmSettings.get_string(KEY_WM_THEME);
if (value != HIGH_CONTRAST_THEME)
wmTheme = value;
});
return highContrast;
},
_buildFontItem: function() {
let settings = new Gio.Settings({ schema: DESKTOP_INTERFACE_SCHEMA });
let factor = settings.get_double(KEY_TEXT_SCALING_FACTOR);
let initial_setting = (factor > 1.0);
let widget = this._buildItemExtended(_("Large Text"),
initial_setting,
settings.is_writable(KEY_TEXT_SCALING_FACTOR),
function (enabled) {
if (enabled)
settings.set_double(KEY_TEXT_SCALING_FACTOR,
DPI_FACTOR_LARGE);
else
settings.reset(KEY_TEXT_SCALING_FACTOR);
});
settings.connect('changed::' + KEY_TEXT_SCALING_FACTOR, function() {
let factor = settings.get_double(KEY_TEXT_SCALING_FACTOR);
let active = (factor > 1.0);
widget.setToggleState(active);
});
return widget;
}
});