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gnome-shell/js/ui/magnifier.js

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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
/* -*- 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();
Don't use double quotes for things that don't need to be translated This is our convention. The only exceptions are double quotes for words in comments that give them a special meaning (though beware that these quotes are not truly necessary most of the time) and double quotes that need to be a part of the output string.
2010-05-13 15:46:04 -04:00
DEFAULT_CROSSHAIRS_COLOR.from_string('Red');
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
// GConf settings
Don't use double quotes for things that don't need to be translated This is our convention. The only exceptions are double quotes for words in comments that give them a special meaning (though beware that these quotes are not truly necessary most of the time) and double quotes that need to be a part of the output string.
2010-05-13 15:46:04 -04:00
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';
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
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.
Don't use double quotes for things that don't need to be translated This is our convention. The only exceptions are double quotes for words in comments that give them a special meaning (though beware that these quotes are not truly necessary most of the time) and double quotes that need to be a part of the output string.
2010-05-13 15:46:04 -04:00
* @color: The color as a string, e.g. '#ff0000ff' or 'red'.
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
*/
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.
Don't use double quotes for things that don't need to be translated This is our convention. The only exceptions are double quotes for words in comments that give them a special meaning (though beware that these quotes are not truly necessary most of the time) and double quotes that need to be a part of the output string.
2010-05-13 15:46:04 -04:00
* @return: The color as a string, e.g. '#0000ffff' or 'blue'.
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
*/
getCrosshairsColor: function() {
if (this._crossHairs) {
let clutterColor = this._crossHairs.getColor();
return clutterColor.to_string();
}
else
Don't use double quotes for things that don't need to be translated This is our convention. The only exceptions are double quotes for words in comments that give them a special meaning (though beware that these quotes are not truly necessary most of the time) and double quotes that need to be a part of the output string.
2010-05-13 15:46:04 -04:00
return '#00000000';
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
},
/**
* 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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