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gnome-shell/js/ui/magnifier.js
Colin Walters dc424280a1 Add missing magnifier files from the last commit 
Also, this patch differs from the one in Bugzilla
in that we start/stop tracking the mouse depending
on whether the magnifier is active.
2010-05-11 15:00:07 -04:00

1485 lines
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JavaScript
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/* -*- mode: js2; js2-basic-offset: 4; indent-tabs-mode: nil -*- */
const DBus = imports.dbus;
const Gtk = imports.gi.Gtk;
const Gdk = imports.gi.Gdk;
const Clutter = imports.gi.Clutter;
const Shell = imports.gi.Shell;
const St = imports.gi.St;
const Lang = imports.lang;
const Mainloop = imports.mainloop;
const Main = imports.ui.main;
const MagnifierDBus = imports.ui.magnifierDBus;
const MouseTrackingMode = {
NONE: 0,
CENTERED: 1,
PUSH: 2,
PROPORTIONAL: 3
};
const ScreenPosition = {
NONE: 0,
FULL_SCREEN: 1,
TOP_HALF: 2,
BOTTOM_HALF: 3,
LEFT_HALF: 4,
RIGHT_HALF: 5
};
// Default settings
const DEFAULT_X_MAGFACTOR = 2;
const DEFAULT_Y_MAGFACTOR = 2;
const DEFAULT_MOUSE_POLL_FREQUENCY = 50;
const DEFAULT_LENS_MODE = false;
const DEFAULT_SCREEN_POSITION = ScreenPosition.BOTTOM_HALF;
const DEFAULT_MOUSE_TRACKING_MODE = MouseTrackingMode.CENTERED;
const DEFAULT_CLAMP_SCROLLING_AT_EDGES = true;
const DEFAULT_SHOW_CROSSHAIRS = false;
const DEFAULT_CROSSHAIRS_THICKNESS = 8;
const DEFAULT_CROSSHAIRS_OPACITY = 169; // 66%
const DEFAULT_CROSSHAIRS_LENGTH = 4096;
const DEFAULT_CROSSHAIRS_CLIP = false;
const DEFAULT_CROSSHAIRS_CLIP_SIZE = [100, 100];
const DEFAULT_CROSSHAIRS_COLOR = new Clutter.Color();
DEFAULT_CROSSHAIRS_COLOR.from_string("Red");
// GConf settings
const A11Y_MAG_PREFS_DIR = "/desktop/gnome/accessibility/magnifier";
const SHOW_KEY = A11Y_MAG_PREFS_DIR + "/show_magnifier";
const SCREEN_POSITION_KEY = A11Y_MAG_PREFS_DIR + "/screen_position";
const MAG_FACTOR_KEY = A11Y_MAG_PREFS_DIR + "/mag_factor";
const LENS_MODE_KEY = A11Y_MAG_PREFS_DIR + "/lens_mode";
const CLAMP_MODE_KEY = A11Y_MAG_PREFS_DIR + "/scroll_at_edges";
const MOUSE_TRACKING_KEY = A11Y_MAG_PREFS_DIR + "/mouse_tracking";
const SHOW_CROSS_HAIRS_KEY = A11Y_MAG_PREFS_DIR + "/show_cross_hairs";
const CROSS_HAIRS_THICKNESS_KEY = A11Y_MAG_PREFS_DIR + "/cross_hairs_thickness";
const CROSS_HAIRS_COLOR_KEY = A11Y_MAG_PREFS_DIR + "/cross_hairs_color";
const CROSS_HAIRS_OPACITY_KEY = A11Y_MAG_PREFS_DIR + "/cross_hairs_opacity";
const CROSS_HAIRS_LENGTH_KEY = A11Y_MAG_PREFS_DIR + "/cross_hairs_length";
const CROSS_HAIRS_CLIP_KEY = A11Y_MAG_PREFS_DIR + "/cross_hairs_clip";
let magDBusService = null;
function Magnifier() {
this._init();
}
Magnifier.prototype = {
_init: function() {
// Magnifier is a manager of ZoomRegions.
this._zoomRegions = [];
// Create small clutter tree for the magnified mouse.
let xfixesCursor = Shell.XFixesCursor.get_default();
this._mouseSprite = new Clutter.Texture();
xfixesCursor.update_texture_image(this._mouseSprite);
this._cursorRoot = new Clutter.Group();
this._cursorRoot.add_actor(this._mouseSprite);
// Create the first ZoomRegion and initialize it according to the
// magnification GConf settings.
let [objUnder, xMouse, yMouse, mask] =
Gdk.Screen.get_default().get_root_window().get_pointer();
let aZoomRegion = new ZoomRegion(this, this._cursorRoot);
this._zoomRegions.push(aZoomRegion);
let showAtLaunch = this._gConfInit(aZoomRegion);
aZoomRegion.scrollContentsTo(xMouse, yMouse);
xfixesCursor.connect('cursor-change', Lang.bind(this, this._updateMouseSprite));
this._xfixesCursor = xfixesCursor;
// Export to dbus.
magDBusService = new MagnifierDBus.ShellMagnifier();
this.setActive(showAtLaunch);
},
/**
* showSystemCursor:
* Show the system mouse pointer.
*/
showSystemCursor: function() {
this._xfixesCursor.show();
},
/**
* hideSystemCursor:
* Hide the system mouse pointer.
*/
hideSystemCursor: function() {
this._xfixesCursor.hide();
},
/**
* setActive:
* Show/hide all the zoom regions.
* @activate: Boolean to activate or de-activate the magnifier.
*/
setActive: function(activate) {
this._zoomRegions.forEach (function(zoomRegion, index, array) {
zoomRegion.setActive(activate);
});
if (activate)
this.startTrackingMouse();
else
this.stopTrackingMouse();
// Make sure system mouse pointer is shown when all zoom regions are
// invisible.
if (!activate)
this._xfixesCursor.show();
},
/**
* isActive:
* @return Whether the magnifier is active (boolean).
*/
isActive: function() {
// Sufficient to check one ZoomRegion since Magnifier's active
// state applies to all of them.
if (this._zoomRegions.length == 0)
return false;
else
return this._zoomRegions[0].isActive();
},
/**
* startTrackingMouse:
* Turn on mouse tracking, if not already doing so.
*/
startTrackingMouse: function() {
// initialize previous mouse coord to undefined.
let prevCoord = { x: NaN, y: NaN };
if (!this._mouseTrackingId)
this._mouseTrackingId = Mainloop.timeout_add(
DEFAULT_MOUSE_POLL_FREQUENCY,
Lang.bind(this, this.scrollToMousePos, prevCoord)
);
},
/**
* stopTrackingMouse:
* Turn off mouse tracking, if not already doing so.
*/
stopTrackingMouse: function() {
if (this._mouseTrackingId)
Mainloop.source_remove(this._mouseTrackingId);
this._mouseTrackingId = null;
},
/**
* isTrackingMouse:
* Is the magnifier tracking the mouse currently?
*/
isTrackingMouse: function() {
return !!this._mouseTrackingId;
},
/**
* scrollToMousePos:
* Position all zoom regions' ROI relative to the current location of the
* system pointer.
* @prevCoord: The previous mouse coordinates. Used to stop scrolling if
* the new position is the same as the last one (optional).
* @return true.
*/
scrollToMousePos: function(prevCoord) {
let [objUnder, xMouse, yMouse, mask] =
Gdk.Screen.get_default().get_root_window().get_pointer();
if (!prevCoord || prevCoord.x != xMouse || prevCoord.y != yMouse) {
let sysMouseOverAny = false;
this._zoomRegions.forEach(function(zoomRegion, index, array) {
if (zoomRegion.scrollToMousePos())
sysMouseOverAny = true;
});
if (sysMouseOverAny)
this.hideSystemCursor();
else
this.showSystemCursor();
if (prevCoord) {
prevCoord.x = xMouse;
prevCoord.y = yMouse;
}
}
return true;
},
/**
* createZoomRegion:
* Create a ZoomRegion instance with the given properties.
* @xMagFactor: The power to set horizontal magnification of the
* ZoomRegion. A value of 1.0 means no magnification. A
* value of 2.0 doubles the size.
* @yMagFactor: The power to set the vertical magnification of the
* ZoomRegion.
* @roi Object in the form { x, y, width, height } that
* defines the region to magnify. Given in unmagnified
* coordinates.
* @viewPort Object in the form { x, y, width, height } that defines
* the position of the ZoomRegion on screen.
* @return The newly created ZoomRegion.
*/
createZoomRegion: function(xMagFactor, yMagFactor, roi, viewPort) {
let zoomRegion = new ZoomRegion(this, this._cursorRoot);
zoomRegion.setMagFactor(xMagFactor, yMagFactor);
zoomRegion.setViewPort(viewPort);
zoomRegion.setROI(roi);
zoomRegion.addCrosshairs(this._crossHairs);
return zoomRegion;
},
/**
* addZoomRegion:
* Append the given ZoomRegion to the list of currently defined ZoomRegions
* for this Magnifier instance.
* @zoomRegion: The zoomRegion to add.
*/
addZoomRegion: function(zoomRegion) {
if(zoomRegion) {
this._zoomRegions.push(zoomRegion);
if (!this.isTrackingMouse())
this.startTrackingMouse();
}
},
/**
* getZoomRegions:
* Return a list of ZoomRegion's for this Magnifier.
* @return: The Magnifier's zoom region list (array).
*/
getZoomRegions: function() {
return this._zoomRegions;
},
/**
* clearAllZoomRegions:
* Remove all the zoom regions from this Magnfier's ZoomRegion list.
*/
clearAllZoomRegions: function() {
// First ZoomRegion is special since its magnified mouse and crosshairs
// are the original -- all the others are Clutter.Clone's. Deal with
// all but first zoom region.
for (let i = 1; i < this._zoomRegions.length; i++) {
this._zoomRegions[i].setActive(false);
this._zoomRegions[i].removeFromStage();
}
this._zoomRegions[0].setActive(false);
// Detach the (original) magnified mouse and cross hair for later reuse
// before removing ZoomRegion from the stage.
this._cursorRoot.get_parent().remove_actor(this._cursorRoot);
if (this._crossHairs)
this._crossHairs.removeFromParent();
this._zoomRegions[0].removeFromStage();
this._zoomRegions.length = 0;
this.stopTrackingMouse();
this.showSystemCursor();
},
/**
* addCrosshairs:
* Add and show a cross hair centered on the magnified mouse.
* @thickness: The thickness of the vertical and horizontal lines of the
* crosshair.
* @color: The color of the crosshairs
* @opacity: The opacity.
* @length: The length of each hair.
* @clip: Whether the crosshairs intersection is clipped by the
* magnified mouse image.
*/
addCrosshairs: function(thickness, color, opacity, length, clip) {
if (!this._crossHairs)
this._crossHairs = new Crosshairs();
this.setCrosshairsThickness(thickness);
this.setCrosshairsColor(color);
this.setCrosshairsOpacity(opacity);
this.setCrosshairsLength(length);
this.setCrosshairsClip(clip);
let theCrossHairs = this._crossHairs;
this._zoomRegions.forEach (function(zoomRegion, index, array) {
zoomRegion.addCrosshairs(theCrossHairs);
});
},
/**
* setCrosshairsVisible:
* Show or hide the cross hair.
* @visible Flag that indicates show (true) or hide (false).
*/
setCrosshairsVisible: function(visible) {
if (visible) {
if (!this._crossHairs)
this.addCrosshairs(DEFAULT_CROSSHAIRS_THICKNESS, DEFAULT_CROSSHAIRS_COLOR, DEFAULT_CROSSHAIRS_OPACITY, DEFAULT_CROSSHAIRS_CLIP);
this._crossHairs.show();
}
else {
if (this._crossHairs)
this._crossHairs.hide();
}
},
/**
* setCrosshairsColor:
* Set the color of the crosshairs for all ZoomRegions.
* @color: The color as a string, e.g. "#ff0000ff" or "red".
*/
setCrosshairsColor: function(color) {
if (this._crossHairs) {
let clutterColor = new Clutter.Color();
clutterColor.from_string(color);
this._crossHairs.setColor(clutterColor);
}
},
/**
* getCrosshairsColor:
* Get the color of the crosshairs.
* @return: The color as a string, e.g. "#0000ffff" for blue.
*/
getCrosshairsColor: function() {
if (this._crossHairs) {
let clutterColor = this._crossHairs.getColor();
return clutterColor.to_string();
}
else
return "#00000000";
},
/**
* setCrosshairsThickness:
* Set the crosshairs thickness for all ZoomRegions.
* @thickness: The width of the vertical and horizontal lines of the
* crosshairs.
*/
setCrosshairsThickness: function(thickness) {
if (this._crossHairs)
this._crossHairs.setThickness(thickness);
},
/**
* getCrosshairsThickness:
* Get the crosshairs thickness.
* @return: The width of the vertical and horizontal lines of the
* crosshairs.
*/
getCrosshairsThickness: function() {
if (this._crossHairs)
return this._crossHairs.getThickness();
else
return 0;
},
/**
* setCrosshairsOpacity:
* @opacity: Value between 0 (transparent) and 255 (fully opaque).
*/
setCrosshairsOpacity: function(opacity) {
if (this._crossHairs)
this._crossHairs.setOpacity(opacity);
},
/**
* getCrosshairsOpacity:
* @return: Value between 0 (transparent) and 255 (fully opaque).
*/
getCrosshairsOpacity: function() {
if (this._crossHairs)
return this._crossHairs.getOpacity();
else
return 0;
},
/**
* setCrosshairsLength:
* Set the crosshairs length for all ZoomRegions.
* @length: The length of the vertical and horizontal lines making up the
* crosshairs.
*/
setCrosshairsLength: function(length) {
if (this._crossHairs)
this._crossHairs.setLength(length);
},
/**
* getCrosshairsLength:
* Get the crosshairs length.
* @return: The length of the vertical and horizontal lines making up the
* crosshairs.
*/
getCrosshairsLength: function() {
if (this._crossHairs)
return this._crossHairs.getLength();
else
return 0;
},
/**
* setCrosshairsClip:
* Set whether the crosshairs are clipped at their intersection.
* @clip: Flag to indicate whether to clip the crosshairs.
*/
setCrosshairsClip: function(clip) {
if (clip) {
if (this._crossHairs)
this._crossHairs.setClip(DEFAULT_CROSSHAIRS_CLIP_SIZE);
}
else {
// Setting no clipping on crosshairs means a zero sized clip
// rectangle.
if (this._crossHairs)
this._crossHairs.setClip([0, 0]);
}
},
/**
* getCrosshairsClip:
* Get whether the crosshairs are clipped by the mouse image.
* @return: Whether the crosshairs are clipped.
*/
getCrosshairsClip: function() {
if (this._crossHairs) {
let [clipWidth, clipHeight] = this._crossHairs.getClip();
return (clipWidth > 0 && clipHeight > 0);
}
else
return false;
},
//// Private methods ////
_updateMouseSprite: function() {
this._xfixesCursor.update_texture_image(this._mouseSprite);
let xHot = this._xfixesCursor.get_hot_x();
let yHot = this._xfixesCursor.get_hot_y();
this._mouseSprite.set_anchor_point(xHot, yHot);
},
_gConfInit: function(zoomRegion) {
let gConf = Shell.GConf.get_default();
if (zoomRegion) {
// Mag factor is accurate to two decimal places.
let aPref = parseFloat(gConf.get_float(MAG_FACTOR_KEY).toFixed(2));
if (aPref != 0.0)
zoomRegion.setMagFactor(aPref, aPref);
aPref = gConf.get_int(SCREEN_POSITION_KEY);
if (aPref)
zoomRegion.setScreenPosition(aPref);
zoomRegion.setLensMode(gConf.get_boolean(LENS_MODE_KEY));
zoomRegion.setClampScrollingAtEdges(!gConf.get_boolean(CLAMP_MODE_KEY));
aPref = gConf.get_int(MOUSE_TRACKING_KEY);
if (aPref)
zoomRegion.setMouseTrackingMode(aPref);
}
let showCrosshairs = gConf.get_boolean(SHOW_CROSS_HAIRS_KEY);
let thickness = gConf.get_int(CROSS_HAIRS_THICKNESS_KEY);
let color = gConf.get_string(CROSS_HAIRS_COLOR_KEY);
let opacity = gConf.get_int(CROSS_HAIRS_OPACITY_KEY);
let length = gConf.get_int(CROSS_HAIRS_LENGTH_KEY);
let clip = gConf.get_boolean(CROSS_HAIRS_CLIP_KEY);
this.addCrosshairs(thickness, color, opacity, length, clip);
this.setCrosshairsVisible(showCrosshairs);
gConf.watch_directory(A11Y_MAG_PREFS_DIR);
gConf.connect('changed::' + SHOW_KEY, Lang.bind(this, this._updateShowHide));
gConf.connect('changed::' + SCREEN_POSITION_KEY, Lang.bind(this, this._updateScreenPosition));
gConf.connect('changed::' + MAG_FACTOR_KEY, Lang.bind(this, this._updateMagFactor));
gConf.connect('changed::' + LENS_MODE_KEY, Lang.bind(this, this._updateLensMode));
gConf.connect('changed::' + CLAMP_MODE_KEY, Lang.bind(this, this._updateClampMode));
gConf.connect('changed::' + MOUSE_TRACKING_KEY, Lang.bind(this, this._updateMouseTrackingMode));
gConf.connect('changed::' + SHOW_CROSS_HAIRS_KEY, Lang.bind(this, this._updateShowCrosshairs));
gConf.connect('changed::' + CROSS_HAIRS_THICKNESS_KEY, Lang.bind(this, this._updateCrosshairsThickness));
gConf.connect('changed::' + CROSS_HAIRS_COLOR_KEY, Lang.bind(this, this._updateCrosshairsColor));
gConf.connect('changed::' + CROSS_HAIRS_OPACITY_KEY, Lang.bind(this, this._updateCrosshairsOpacity));
gConf.connect('changed::' + CROSS_HAIRS_LENGTH_KEY, Lang.bind(this, this._updateCrosshairsLength));
gConf.connect('changed::' + CROSS_HAIRS_CLIP_KEY, Lang.bind(this, this._updateCrosshairsClip));
return gConf.get_boolean(SHOW_KEY);
},
_updateShowHide: function() {
let gConf = Shell.GConf.get_default();
this.setActive(gConf.get_boolean(SHOW_KEY));
},
_updateScreenPosition: function() {
// Applies only to the first zoom region.
if (this._zoomRegions.length) {
let gConf = Shell.GConf.get_default();
let position = gConf.get_int(SCREEN_POSITION_KEY);
this._zoomRegions[0].setScreenPosition(position);
if (position != ScreenPosition.FULL_SCREEN)
this._updateLensMode();
}
},
_updateMagFactor: function() {
// Applies only to the first zoom region.
if (this._zoomRegions.length) {
let gConf = Shell.GConf.get_default();
// Mag factor is accurate to two decimal places.
let magFactor = parseFloat(gConf.get_float(MAG_FACTOR_KEY).toFixed(2));
this._zoomRegions[0].setMagFactor(magFactor, magFactor);
}
},
_updateLensMode: function() {
// Applies only to the first zoom region.
if (this._zoomRegions.length) {
let gConf = Shell.GConf.get_default();
this._zoomRegions[0].setLensMode(gConf.get_boolean(LENS_MODE_KEY));
}
},
_updateClampMode: function() {
// Applies only to the first zoom region.
if (this._zoomRegions.length) {
let gConf = Shell.GConf.get_default();
this._zoomRegions[0].setClampScrollingAtEdges(
!gConf.get_boolean(CLAMP_MODE_KEY)
);
}
},
_updateMouseTrackingMode: function() {
// Applies only to the first zoom region.
if (this._zoomRegions.length) {
let gConf = Shell.GConf.get_default();
this._zoomRegions[0].setMouseTrackingMode(
gConf.get_int(MOUSE_TRACKING_KEY)
);
}
},
_updateShowCrosshairs: function() {
let gConf = Shell.GConf.get_default();
this.setCrosshairsVisible(gConf.get_boolean(SHOW_CROSS_HAIRS_KEY));
},
_updateCrosshairsThickness: function() {
let gConf = Shell.GConf.get_default();
this.setCrosshairsThickness(gConf.get_int(CROSS_HAIRS_THICKNESS_KEY));
},
_updateCrosshairsColor: function() {
let gConf = Shell.GConf.get_default();
this.setCrosshairsColor(gConf.get_string(CROSS_HAIRS_COLOR_KEY));
},
_updateCrosshairsOpacity: function() {
let gConf = Shell.GConf.get_default();
this.setCrosshairsOpacity(gConf.get_int(CROSS_HAIRS_OPACITY_KEY));
},
_updateCrosshairsLength: function() {
let gConf = Shell.GConf.get_default();
this.setCrosshairsLength(gConf.get_int(CROSS_HAIRS_LENGTH_KEY));
},
_updateCrosshairsClip: function() {
let gConf = Shell.GConf.get_default();
this.setCrosshairsClip(gConf.get_boolean(CROSS_HAIRS_CLIP_KEY));
}
}
function ZoomRegion(magnifier, mouseRoot) {
this._init(magnifier, mouseRoot);
}
ZoomRegion.prototype = {
_init: function(magnifier, mouseRoot) {
this._magnifier = magnifier;
// The root actor for the zoom region
this._magView = new St.Bin({ style_class: 'magnifier-zoom-region', x_fill: true, y_fill: true });
global.stage.add_actor(this._magView);
this._magView.hide();
// Append a Clutter.Group to clip the contents of the magnified view.
this._mainGroup = new Clutter.Group({ clip_to_allocation: true });
this._magView.set_child(this._mainGroup);
// Add a background for when the magnified uiGroup is scrolled
// out of view (don't want to see desktop showing through).
let background = new Clutter.Rectangle({ color: Main.DEFAULT_BACKGROUND_COLOR });
this._mainGroup.add_actor(background);
// Clone the group that contains all of UI on the screen. This is the
// chrome, the windows, etc.
this._uiGroupClone = new Clutter.Clone({ source: Main.uiGroup });
this._mainGroup.add_actor(this._uiGroupClone);
Main.uiGroup.set_size(global.screen_width, global.screen_height);
background.set_size(global.screen_width, global.screen_height);
this._uiGroupClone.set_size(global.screen_width, global.screen_height);
// Add either the given mouseRoot to the ZoomRegion, or a clone of
// it.
if (mouseRoot.get_parent() != null)
this._mouseRoot = new Clutter.Clone({ source: mouseRoot });
else
this._mouseRoot = mouseRoot;
this._mainGroup.add_actor(this._mouseRoot);
this._crossHairs = null;
this.setMagFactor(DEFAULT_X_MAGFACTOR, DEFAULT_Y_MAGFACTOR);
this.setScreenPosition(DEFAULT_SCREEN_POSITION);
this.setLensMode(DEFAULT_LENS_MODE);
this.setClampScrollingAtEdges(DEFAULT_CLAMP_SCROLLING_AT_EDGES);
this.setMouseTrackingMode(DEFAULT_MOUSE_TRACKING_MODE);
},
/**
* setActive:
* @activate: Boolean to show/hide the ZoomRegion.
*/
setActive: function(activate) {
if (activate) {
this._magView.show();
if (this.isMouseOverRegion())
this._magnifier.hideSystemCursor();
this._updateMousePosition(false /* mouse didn't move */);
}
else
this._magView.hide();
},
/**
* isActive:
* @return Whether this ZoomRegion is active (boolean).
*/
isActive: function() {
return this._magView.visible;
},
/**
* removeFromStage:
* Remove the magnified view from the stage.
*/
removeFromStage: function() {
global.stage.remove_actor(this._magView);
this._mouseRoot = null;
this._uiGroupClone = null;
this._magView = null;
},
/**
* setMagFactor:
* @xMagFactor: The power to set the horizontal magnification factor to
* of the magnified view. A value of 1.0 means no
* magnification. A value of 2.0 doubles the size.
* @yMagFactor: The power to set the vertical magnification factor to
* of the magnified view.
*/
setMagFactor: function(xMagFactor, yMagFactor) {
if (xMagFactor > 0 && yMagFactor > 0) {
// Changing the mag factor moves the pixels along the axes of
// magnification. Set the view back to the point that was at the centre
// of the region of interest.
let [x, y, width, height] = this.getROI();
let xCentre = x + width / 2;
let yCentre = y + height / 2;
this._uiGroupClone.set_scale(xMagFactor, yMagFactor);
this._mouseRoot.set_scale(xMagFactor, yMagFactor);
this._calcRightBottomStops();
this._scrollToPosition(xCentre, yCentre);
this._updateMousePosition(false /* mouse didn't move */);
}
},
/**
* getMagFactor:
* @return an array, [xMagFactor, yMagFactor], containing the horizontal
* and vertical magnification powers. A value of 1.0 means no
* magnification. A value of 2.0 means the contents are doubled
* in size, and so on.
*/
getMagFactor: function() {
return this._uiGroupClone.get_scale();
},
/**
* setMouseTrackingMode
* @mode: One of the enum MouseTrackingMode values.
*/
setMouseTrackingMode: function(mode) {
if (mode >= MouseTrackingMode.NONE && mode <= MouseTrackingMode.PROPORTIONAL)
this._mouseTrackingMode = mode;
},
/**
* getMouseTrackingMode
* @return: One of the enum MouseTrackingMode values.
*/
getMouseTrackingMode: function() {
return this._mouseTrackingMode;
},
/**
* setViewPort
* Sets the position and size of the ZoomRegion on screen.
* @viewPort: Object defining the position and size of the view port. It
* has the form { x, y, width, height }. The values are in
* stage coordinate space.
*/
setViewPort: function(viewPort) {
let [xRoi, yRoi, wRoi, hRoi] = this.getROI();
// Remove border if the view port is the entire screen. Otherwise,
// ensure that the border is there.
if (viewPort.x == 0 && viewPort.y == 0 && viewPort.width == global.screen_width && viewPort.height == global.screen_height)
this._magView.add_style_class_name('full-screen');
else
this._magView.remove_style_class_name('full-screen');
this.setSize(viewPort.width, viewPort.height);
this.setPosition(viewPort.x, viewPort.y);
if (this._crossHairs)
this._crossHairs.reCenter();
this.scrollContentsTo(xRoi + wRoi / 2, yRoi + hRoi / 2);
if (this.isMouseOverRegion())
this._magnifier.hideSystemCursor();
this._screenPosition = ScreenPosition.NONE;
},
/**
* setROI
* Sets the "region of interest" that the ZoomRegion is magnifying.
* @roi: Object that defines the region of the screen to magnify. It
* has the form { x, y, width, height }. The values are in
* screen (unmagnified) coordinate space.
*/
setROI: function(roi) {
let xRoiCenter = roi.x + roi.width / 2;
let yRoiCenter = roi.y + roi.height / 2;
this.scrollContentsTo(xRoiCenter, yRoiCenter);
},
/**
* setSize:
* @width: The width to set the magnified view to.
* @height: The height to set the magnified view to.
*/
setSize: function(width, height) {
this._magView.set_size(width, height);
this._calcRightBottomStops();
},
/**
* getSize:
* @return an array, [width, height], that specifies the size of the
* magnified view.
*/
getSize: function() {
return this._magView.get_size();
},
/**
* setPosition:
* Position the magnified view at the given coordinates.
* @x: The x-coord of the new position.
* @y: The y-coord of the new position.
*/
setPosition: function(x, y) {
let [width, height] = this._magView.get_size();
if (this._clampScrollingAtEdges) {
// Restrict positioning so view doesn't go beyond any edge of the
// screen.
if (x < 0)
x = 0;
if (x + width > global.screen_width)
x = global.screen_width - width;
if (y < 0)
y = 0;
if (y + height > global.screen_height)
y = global.screen_height - height;
}
this._magView.set_position(x, y);
},
/**
* getPosition:
* @return an array, [x, y], that gives the position of the
* magnified view on screen.
*/
getPosition: function() {
return this._magView.get_position();
},
/**
* getCenter:
* @return an array, [x, y], that is half the width and height of the
* magnified view (the center of the magnified view).
*/
getCenter: function() {
let [width, height] = this._magView.get_size();
return [width / 2, height / 2];
},
/**
* isFullScreenMode:
* Does the magnified view occupy the whole screen?
*/
isFullScreenMode: function() {
let [x, y] = this._magView.get_position();
if (x != 0 || y != 0)
return false;
[width, height] = this._magView.get_size();
if (width != global.screen_width || height != global.screen_height)
return false;
return true;
},
/**
* getROI:
* Retrieves the "region of interest" -- the rectangular bounds of that part
* of the desktop that the magnified view is showing (x, y, width, height).
* The bounds are given in non-magnified coordinates.
* @return an array, [x, y, width, height], representing the bounding
* rectangle of what is shown in the magnified view.
*/
getROI: function() {
let [xMagnified, yMagnified] = this._uiGroupClone.get_position();
let [xMagFactor, yMagFactor] = this.getMagFactor();
let [width, height] = this.getSize();
let x = (0 - xMagnified) / xMagFactor;
let y = (0 - yMagnified) / yMagFactor;
return [x, y, width / xMagFactor, height / yMagFactor];
},
/**
* setLensMode:
* Turn lens mode on/off. In full screen mode, lens mode is alway off since
* a lens the size of the screen is pointless.
* @lensMode: A boolean to set the sense of lens mode.
*/
setLensMode: function(lensMode) {
let fullScreen = this.isFullScreenMode();
this._lensMode = (lensMode && !fullScreen);
if (!this._lensMode && !fullScreen)
this.setScreenPosition (this._screenPosition);
},
/**
* isLensMode:
* Is lens mode on or off?
* @return The lens mode state as a boolean.
*/
isLensMode: function() {
return this._lensMode;
},
/**
* setClampScrollingAtEdges:
* Stop vs. allow scrolling of the magnified contents when it scroll beyond
* the edges of the screen.
* @clamp: Boolean to turn on/off clamping.
*/
setClampScrollingAtEdges: function(clamp) {
this._clampScrollingAtEdges = clamp;
},
/**
* setTopHalf:
* Magnifier view occupies the top half of the screen.
*/
setTopHalf: function() {
let viewPort = {};
viewPort.x = 0;
viewPort.y = 0;
viewPort.width = global.screen_width;
viewPort.height = global.screen_height/2;
this.setViewPort(viewPort);
this._screenPosition = ScreenPosition.TOP_HALF;
},
/**
* setBottomHalf:
* Magnifier view occupies the bottom half of the screen.
*/
setBottomHalf: function() {
let viewPort = {};
viewPort.x = 0;
viewPort.y = global.screen_height/2;
viewPort.width = global.screen_width;
viewPort.height = global.screen_height/2;
this.setViewPort(viewPort);
this._screenPosition = ScreenPosition.BOTTOM_HALF;
},
/**
* setLeftHalf:
* Magnifier view occupies the left half of the screen.
*/
setLeftHalf: function() {
let viewPort = {};
viewPort.x = 0;
viewPort.y = 0;
viewPort.width = global.screen_width/2;
viewPort.height = global.screen_height;
this.setViewPort(viewPort);
this._screenPosition = ScreenPosition.LEFT_HALF;
},
/**
* setRightHalf:
* Magnifier view occupies the right half of the screen.
*/
setRightHalf: function() {
let viewPort = {};
viewPort.x = global.screen_width/2;
viewPort.y = 0;
viewPort.width = global.screen_width/2;
viewPort.height = global.screen_height;
this.setViewPort(viewPort);
this._screenPosition = ScreenPosition.RIGHT_HALF;
},
/**
* getScreenPosition:
* Tell the outside world what the current mode is -- magnifiying the
* top half, bottom half, etc.
* @return: the current mode.
*/
getScreenPosition: function() {
return this._screenPosition;
},
/**
* scrollToMousePos:
* Set the region of interest based on the position of the system pointer.
* @return: Whether the system mouse pointer is over the magnified view.
*/
scrollToMousePos: function() {
let [objUnder, xMouse, yMouse, mask] =
Gdk.Screen.get_default().get_root_window().get_pointer();
if (this._mouseTrackingMode == MouseTrackingMode.PROPORTIONAL) {
this._setROIProportional(xMouse, yMouse);
}
else if (this._mouseTrackingMode == MouseTrackingMode.PUSH) {
this._setROIPush(xMouse, yMouse);
}
else if (this._mouseTrackingMode == MouseTrackingMode.CENTERED) {
this._setROICentered(xMouse, yMouse);
}
this._updateMousePosition(true);
// Determine whether the system mouse pointer is over this zoom region.
return this.isMouseOverRegion(xMouse, yMouse);
},
/**
* setFullScreenMode:
* Set the ZoomRegion to full-screen mode.
* Note: disallows lens mode.
*/
setFullScreenMode: function() {
if (!this.isFullScreenMode()) {
let viewPort = {};
viewPort.x = 0;
viewPort.y = 0;
viewPort.width = global.screen_width;
viewPort.height = global.screen_height;
this.setViewPort(viewPort);
this.setLensMode(false);
if (this.isActive())
this._magnifier.hideSystemCursor();
this._screenPosition = ScreenPosition.FULL_SCREEN;
}
},
/**
* setScreenPosition:
* Positions the zoom region to one of the enumerated positions on the
* screen.
* @position: one of Magnifier.FULL_SCREEN, Magnifier.TOP_HALF,
* Magnifier.BOTTOM_HALF,Magnifier.LEFT_HALF, or
* Magnifier.RIGHT_HALF.
*/
setScreenPosition: function(inPosition) {
switch (inPosition) {
case ScreenPosition.FULL_SCREEN:
this.setFullScreenMode();
break;
case ScreenPosition.TOP_HALF:
this.setTopHalf();
break;
case ScreenPosition.BOTTOM_HALF:
this.setBottomHalf();
break;
case ScreenPosition.LEFT_HALF:
this.setLeftHalf();
break;
case ScreenPosition.RIGHT_HALF:
this.setRightHalf();
break;
}
},
/**
* scrollContentsTo:
* Shift the contents of the magnified view such it is centered on the given
* coordinate. Also, update the position of the magnified mouse image after
* the shift.
* @x: The x-coord of the point to center on.
* @y: The y-coord of the point to center on.
*/
scrollContentsTo: function(x, y) {
this._scrollToPosition(x, y);
this._updateMousePosition(false /* mouse didn't move */);
},
/**
* isMouseOverRegion:
* Return whether the system mouse sprite is over this ZoomRegion. If the
* mouse's position is not given, then it is fetched.
* @xMouse: The system mouse's x-coord. Optional.
* @yMouse: The system mouse's y-coord. Optional.
* @return: Boolean: true if the mouse is over the zoom region; false
* otherwise.
*/
isMouseOverRegion: function(xMouse, yMouse) {
let mouseIsOver = false;
if (this.isActive()) {
if (!xMouse || !yMouse) {
let [objUnder, x, y, mask] =
Gdk.Screen.get_default().get_root_window().get_pointer();
xMouse = x;
yMouse = y;
}
let [x, y] = this.getPosition();
let [width, height] = this.getSize();
mouseIsOver = (
xMouse >= x && xMouse < (x + width) &&
yMouse >= y && yMouse < (y + height)
);
}
return mouseIsOver;
},
/**
* addCrosshairs:
* Add crosshairs centered on the magnified mouse.
* @crossHairs Clutter.Group that contains the actors for the crosshairs.
*/
addCrosshairs: function(crossHairs) {
// If the crossHairs is not already within a larger container, add it
// to this zoom region. Otherwise, add a clone.
if (crossHairs) {
this._crosshairsActor = crossHairs.addToZoomRegion(this, this._mouseRoot);
this._crossHairs = crossHairs;
}
},
//// Private methods ////
_scrollToPosition: function(x, y) {
// Given the point (x, y) in non-magnified coordinates, scroll the
// magnified contenst such that the point is at the centre of the
// magnified view.
let [xMagFactor, yMagFactor] = this.getMagFactor();
let xMagnified = x * xMagFactor;
let yMagnified = y * yMagFactor;
let [xCenterMagView, yCenterMagView] = this.getCenter();
let newX = xCenterMagView - xMagnified;
let newY = yCenterMagView - yMagnified;
if (this._clampScrollingAtEdges) {
if (newX > 0)
newX = 0;
else if (newX < this._rightStop)
newX = this._rightStop;
if (newY > 0)
newY = 0;
else if (newY < this._bottomStop)
newY = this._bottomStop;
this._uiGroupClone.set_position(newX, newY);
}
else
this._uiGroupClone.set_position(newX, newY);
// If in lens mode, move the magnified view such that it is centered
// over the actual mouse. However, in full screen mode, the "lens" is
// the size of the screen -- pointless to move such a large lens around.
if (this._lensMode && !this.isFullScreenMode())
this.setPosition(x - xCenterMagView, y - yCenterMagView);
},
_calcRightBottomStops: function() {
// Calculate the location of the top-left corner of _uiGroupClone
// when its right and bottom edges are coincident with the right and
// bottom edges of the _magView.
let [contentWidth, contentHeight] = this._uiGroupClone.get_size();
let [viewWidth, viewHeight] = this.getSize();
let [xMagFactor, yMagFactor] = this.getMagFactor();
let rightStop = viewWidth - (contentWidth * xMagFactor);
let bottomStop = viewHeight - (contentHeight * yMagFactor);
this._rightStop = parseInt(rightStop.toFixed(1));
this._bottomStop = parseInt(bottomStop.toFixed(1));
},
_setROIPush: function(xMouse, yMouse) {
let [xRoi, yRoi, widthRoi, heightRoi] = this.getROI();
let [cursorWidth, cursorHeight] = this._mouseRoot.get_size();
let xPos = xRoi + widthRoi / 2;
let yPos = yRoi + heightRoi / 2;
let xRoiRight = xRoi + widthRoi - cursorWidth;
let yRoiBottom = yRoi + heightRoi - cursorHeight;
if (xMouse < xRoi)
xPos -= (xRoi - xMouse);
else if (xMouse > xRoiRight)
xPos += (xMouse - xRoiRight);
if (yMouse < yRoi)
yPos -= (yRoi - yMouse);
else if (yMouse > yRoiBottom)
yPos += (yMouse - yRoiBottom);
this._scrollToPosition(xPos, yPos);
},
_setROIProportional: function(xMouse, yMouse) {
let [xRoi, yRoi, widthRoi, heightRoi] = this.getROI();
let halfScreenWidth = global.screen_width / 2;
let halfScreenHeight = global.screen_height / 2;
let xProportion = (halfScreenWidth - xMouse) / halfScreenWidth;
let yProportion = (halfScreenHeight - yMouse) / halfScreenHeight;
let xPos = xMouse + xProportion * widthRoi / 2;
let yPos = yMouse + yProportion * heightRoi / 2;
this._scrollToPosition(xPos, yPos);
},
_setROICentered: function(xMouse, yMouse) {
this._scrollToPosition(xMouse, yMouse);
},
_updateMousePosition: function(mouseMoved) {
let [x, y] = this._uiGroupClone.get_position();
x = parseInt(x.toFixed(1));
y = parseInt(y.toFixed(1));
let [xCenterMagView, yCenterMagView] = this.getCenter();
let [objUnder, xMouse, yMouse, mask] =
Gdk.Screen.get_default().get_root_window().get_pointer();
let [xMagFactor, yMagFactor] = this.getMagFactor();
let xMagMouse = xMouse * xMagFactor + x;
let yMagMouse = yMouse * yMagFactor + y;
if (mouseMoved) {
if (x == 0)
xMagMouse = xMouse * xMagFactor;
else if (x == this._rightStop)
xMagMouse = (xMouse * xMagFactor) + this._rightStop;
else if (this._mouseTrackingMode == MouseTrackingMode.CENTERED)
xMagMouse = xCenterMagView;
if (y == 0)
yMagMouse = yMouse * yMagFactor;
else if (y == this._bottomStop)
yMagMouse = (yMouse * yMagFactor) + this._bottomStop;
else if (this._mouseTrackingMode == MouseTrackingMode.CENTERED)
yMagMouse = yCenterMagView;
}
this._mouseRoot.set_position(xMagMouse, yMagMouse);
this._updateCrosshairsPosition(xMagMouse, yMagMouse);
},
_updateCrosshairsPosition: function(x, y) {
if (this._crosshairsActor) {
let [groupWidth, groupHeight] = this._crosshairsActor.get_size();
this._crosshairsActor.set_position(x - groupWidth / 2, y - groupHeight / 2);
}
}
}
function Crosshairs() {
this._init();
}
Crosshairs.prototype = {
_init: function() {
// Set the group containing the crosshairs to three times the desktop
// size in case the crosshairs need to appear to be infinite in
// length (i.e., extend beyond the edges of the view they appear in).
let groupWidth = global.screen_width * 3;
let groupHeight = global.screen_height * 3;
this._actor = new Clutter.Group({
clip_to_allocation: false,
width: groupWidth,
height: groupHeight
});
this._horizLeftHair = new Clutter.Rectangle({
color: DEFAULT_CROSSHAIRS_COLOR,
width: groupWidth / 2,
height: DEFAULT_CROSSHAIRS_THICKNESS,
opacity: DEFAULT_CROSSHAIRS_OPACITY
});
this._horizRightHair = new Clutter.Rectangle({
color: DEFAULT_CROSSHAIRS_COLOR,
width: groupWidth / 2,
height: DEFAULT_CROSSHAIRS_THICKNESS,
opacity: DEFAULT_CROSSHAIRS_OPACITY
});
this._vertTopHair = new Clutter.Rectangle({
color: DEFAULT_CROSSHAIRS_COLOR,
width: DEFAULT_CROSSHAIRS_THICKNESS,
height: groupHeight / 2,
opacity: DEFAULT_CROSSHAIRS_OPACITY
});
this._vertBottomHair = new Clutter.Rectangle({
color: DEFAULT_CROSSHAIRS_COLOR,
width: DEFAULT_CROSSHAIRS_THICKNESS,
height: groupHeight / 2,
opacity: DEFAULT_CROSSHAIRS_OPACITY
});
this._actor.add_actor(this._horizLeftHair);
this._actor.add_actor(this._horizRightHair);
this._actor.add_actor(this._vertTopHair);
this._actor.add_actor(this._vertBottomHair);
this._clipSize = [0, 0];
this._clones = [];
this.reCenter();
},
/**
* addToZoomRegion
* Either add the crosshairs actor to the given ZoomRegion, or, if it is
* already part of some other ZoomRegion, create a clone of the crosshairs
* actor, and add the clone instead. Returns either the original or the
* clone.
* @zoomRegion: The container to add the crosshairs group to.
* @magnifiedMouse: The mouse actor for the zoom region -- used to
* position the crosshairs and properly layer them below
* the mouse.
* @return The crosshairs actor, or its clone.
*/
addToZoomRegion: function(zoomRegion, magnifiedMouse) {
let crosshairsActor = null;
if (zoomRegion && magnifiedMouse) {
let container = magnifiedMouse.get_parent();
if (container) {
crosshairsActor = this._actor;
if (this._actor.get_parent() != null) {
crosshairsActor = new Clutter.Clone({ source: this._actor });
this._clones.push(crosshairsActor);
}
if (this._actor.visible)
crosshairsActor.show();
else
crosshairsActor.hide();
container.add_actor(crosshairsActor);
container.raise_child(magnifiedMouse, crosshairsActor);
let [xMouse, yMouse] = magnifiedMouse.get_position();
let [crosshairsWidth, crosshairsHeight] = crosshairsActor.get_size();
crosshairsActor.set_position(xMouse - crosshairsWidth / 2 , yMouse - crosshairsHeight / 2);
}
}
return crosshairsActor;
},
/**
* removeFromParent:
* Remove the crosshairs actor from its parent container.
*/
removeFromParent: function() {
this._actor.get_parent().remove_actor(this._actor);
},
/**
* setColor:
* Set the color of the crosshairs.
* @clutterColor: The color as a Clutter.Color.
*/
setColor: function(clutterColor) {
this._horizLeftHair.set_color(clutterColor);
this._horizRightHair.set_color(clutterColor);
this._vertTopHair.set_color(clutterColor);
this._vertBottomHair.set_color(clutterColor);
},
/**
* getColor:
* Get the color of the crosshairs.
* @color: The color as a Clutter.Color.
*/
getColor: function() {
let clutterColor = new Clutter.Color();
this._horizLeftHair.get_color(clutterColor);
return clutterColor;
},
/**
* setThickness:
* Set the width of the vertical and horizontal lines of the crosshairs.
* @thickness
*/
setThickness: function(thickness) {
this._horizLeftHair.set_height(thickness);
this._horizRightHair.set_height(thickness);
this._vertTopHair.set_width(thickness);
this._vertBottomHair.set_width(thickness);
this.reCenter();
},
/**
* getThickness:
* Get the width of the vertical and horizontal lines of the crosshairs.
* @return: The thickness of the crosshairs.
*/
getThickness: function() {
return this._horizLeftHair.get_height();
},
/**
* setOpacity:
* Set how opaque the crosshairs are.
* @opacity: Value between 0 (fully transparent) and 255 (full opaque).
*/
setOpacity: function(opacity) {
// set_opacity() throws an exception for values outside the range
// [0, 255].
if (opacity < 0)
opacity = 0;
else if (opacity > 255)
opacity = 255;
this._horizLeftHair.set_opacity(opacity);
this._horizRightHair.set_opacity(opacity);
this._vertTopHair.set_opacity(opacity);
this._vertBottomHair.set_opacity(opacity);
},
/**
* getOpacity:
* Retriev how opaque the crosshairs are.
* @return: A value between 0 (transparent) and 255 (opaque).
*/
getOpacity: function() {
return this._horizLeftHair.get_opacity();
},
/**
* setLength:
* Set the length of the vertical and horizontal lines in the crosshairs.
* @length: The length of the crosshairs.
*/
setLength: function(length) {
this._horizLeftHair.set_width(length);
this._horizRightHair.set_width(length);
this._vertTopHair.set_height(length);
this._vertBottomHair.set_height(length);
this.reCenter();
},
/**
* getLength:
* Get the length of the vertical and horizontal lines in the crosshairs.
* @return: The length of the crosshairs.
*/
getLength: function() {
return this._horizLeftHair.get_width();
},
/**
* setClip:
* Set the width and height of the rectangle that clips the crosshairs at
* their intersection
* @size: Array of [width, height] defining the size of the clip
* rectangle.
*/
setClip: function(size) {
if (size) {
// Take a chunk out of the crosshairs where it intersects the
// mouse.
this._clipSize = size;
this.reCenter();
}
else {
// Restore the missing chunk.
this._clipSize = [0, 0];
this.reCenter();
}
},
/**
* getClip:
* Get the dimensions of the clip rectangle.
* @return: An array of the form [width, height].
*/
getClip: function() {
return this._clipSize;
},
/**
* show:
* Show the crosshairs.
*/
show: function() {
this._actor.show();
// Clones don't share visibility.
for (let i = 0; i < this._clones.length; i++)
this._clones[i].show();
},
/**
* hide:
* Hide the crosshairs.
*/
hide: function() {
this._actor.hide();
// Clones don't share visibility.
for (let i = 0; i < this._clones.length; i++)
this._clones[i].hide();
},
/**
* reCenter:
* Reposition the horizontal and vertical hairs such that they cross at
* the center of crosshairs group. If called with the dimensions of
* the clip rectangle, these are used to update the size of the clip.
* @clipSize: Optional. If present, an array of the form [width, height].
*/
reCenter: function(clipSize) {
let [groupWidth, groupHeight] = this._actor.get_size();
let leftLength = this._horizLeftHair.get_width();
let rightLength = this._horizRightHair.get_width();
let topLength = this._vertTopHair.get_height();
let bottomLength = this._vertBottomHair.get_height();
let thickness = this._horizLeftHair.get_height();
// Deal with clip rectangle.
if (clipSize)
this._clipSize = clipSize;
let clipWidth = this._clipSize[0];
let clipHeight = this._clipSize[1];
// Note that clip, if present, is not centred on the cross hair
// intersection, but biased towards the top left.
let left = groupWidth / 2 - clipWidth * 0.25 - leftLength;
let right = groupWidth / 2 + clipWidth * 0.75;
let top = groupHeight / 2 - clipHeight * 0.25 - topLength - thickness / 2;
let bottom = groupHeight / 2 + clipHeight * 0.75 + thickness / 2;
this._horizLeftHair.set_position(left, (groupHeight - thickness) / 2);
this._horizRightHair.set_position(right, (groupHeight - thickness) / 2);
this._vertTopHair.set_position((groupWidth - thickness) / 2, top);
this._vertBottomHair.set_position((groupWidth - thickness) / 2, bottom);
}
}
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