jitsi_corner8/modules/UI/util/UIUtil.js

/*
 * Copyright @ 2015 Atlassian Pty Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Created by hristo on 12/22/14.
 */
module.exports = {
    /**
     * Returns the available video width.
     */
    getAvailableVideoWidth: function () {
        var PanelToggler = require("../side_pannels/SidePanelToggler");
        var rightPanelWidth
            = PanelToggler.isVisible() ? PanelToggler.getPanelSize()[0] : 0;

        return window.innerWidth - rightPanelWidth;
    },
    /**
     * Changes the style class of the element given by id.
     */
    buttonClick: function(id, classname) {
        $(id).toggleClass(classname); // add the class to the clicked element
    },
    /**
     * Returns the text width for the given element.
     *
     * @param el the element
     */
    getTextWidth: function (el) {
        return (el.clientWidth + 1);
    },

    /**
     * Returns the text height for the given element.
     *
     * @param el the element
     */
    getTextHeight: function (el) {
        return (el.clientHeight + 1);
    },

    /**
     * Plays the sound given by id.
     *
     * @param id the identifier of the audio element.
     */
    playSoundNotification: function (id) {
        document.getElementById(id).play();
    },

    /**
     * Escapes the given text.
     */
    escapeHtml: function (unsafeText) {
        return $('<div/>').text(unsafeText).html();
    },

    imageToGrayScale: function (canvas) {
        var context = canvas.getContext('2d');
        var imgData = context.getImageData(0, 0, canvas.width, canvas.height);
        var pixels  = imgData.data;

        for (var i = 0, n = pixels.length; i < n; i += 4) {
            var grayscale
                = pixels[i] * .3 + pixels[i+1] * .59 + pixels[i+2] * .11;
            pixels[i  ] = grayscale;        // red
            pixels[i+1] = grayscale;        // green
            pixels[i+2] = grayscale;        // blue
            // pixels[i+3]              is alpha
        }
        // redraw the image in black & white
        context.putImageData(imgData, 0, 0);
    },

    setTooltip: function (element, key, position) {
        element.setAttribute("data-i18n", "[data-content]" + key);
        element.setAttribute("data-toggle", "popover");
        element.setAttribute("data-placement", position);
        element.setAttribute("data-html", true);
        element.setAttribute("data-container", "body");
    }


};