gnome-shell/js/ui/separator.js

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// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
const Cairo = imports.cairo;
const Lang = imports.lang;
const St = imports.gi.St;
const HorizontalSeparator = new Lang.Class({
Name: 'HorizontalSeparator',
_init: function (params) {
this.actor = new St.DrawingArea(params);
this.actor.connect('repaint', Lang.bind(this, this._onRepaint));
},
_onRepaint: function(area) {
let cr = area.get_context();
let themeNode = area.get_theme_node();
let [width, height] = area.get_surface_size();
let margin = themeNode.get_length('-margin-horizontal');
let gradientHeight = themeNode.get_length('-gradient-height');
let startColor = themeNode.get_color('-gradient-start');
let endColor = themeNode.get_color('-gradient-end');
let gradientWidth = (width - margin * 2);
let gradientOffset = (height - gradientHeight) / 2;
let pattern = new Cairo.LinearGradient(margin, gradientOffset, width - margin, gradientOffset + gradientHeight);
pattern.addColorStopRGBA(0, startColor.red / 255, startColor.green / 255, startColor.blue / 255, startColor.alpha / 255);
pattern.addColorStopRGBA(0.5, endColor.red / 255, endColor.green / 255, endColor.blue / 255, endColor.alpha / 255);
pattern.addColorStopRGBA(1, startColor.red / 255, startColor.green / 255, startColor.blue / 255, startColor.alpha / 255);
cr.setSource(pattern);
cr.rectangle(margin, gradientOffset, gradientWidth, gradientHeight);
cr.fill();
cr.$dispose();
}
});