boards/static/js/image.js

/*
 @licstart  The following is the entire license notice for the
 JavaScript code in this page.


 Copyright (C) 2013  neko259

 The JavaScript code in this page is free software: you can
 redistribute it and/or modify it under the terms of the GNU
 General Public License (GNU GPL) as published by the Free Software
 Foundation, either version 3 of the License, or (at your option)
 any later version.  The code is distributed WITHOUT ANY WARRANTY;
 without even the implied warranty of MERCHANTABILITY or FITNESS
 FOR A PARTICULAR PURPOSE.  See the GNU GPL for more details.

 As additional permission under GNU GPL version 3 section 7, you
 may distribute non-source (e.g., minimized or compacted) forms of
 that code without the copy of the GNU GPL normally required by
 section 4, provided you include this license notice and a URL
 through which recipients can access the Corresponding Source.

 @licend  The above is the entire license notice
 for the JavaScript code in this page.
 */


var IMAGE_VIEWERS = [
    ['simple', new SimpleImageViewer()],
    ['popup', new PopupImageViewer()]
];

var FULL_IMG_CLASS = 'post-image-full';


function ImageViewer() {}
ImageViewer.prototype.view = function (post) {};

function SimpleImageViewer() {}
SimpleImageViewer.prototype.view = function (post) {
    var images = post.find('img');
    images.toggle();

    // When we first enlarge an image, a full image needs to be created
    if (images.length == 1) {
        var thumb = images.first();

        var width = thumb.attr('data-width');
        var height = thumb.attr('data-height');

        if (width == null || height == null) {
            width = '100%';
            height = '100%';
        }

        var parent = images.first().parent();
        var link = parent.attr('href');

        var fullImg = $('<img />')
            .addClass(FULL_IMG_CLASS)
            .attr('src', link)
            .attr('width', width)
            .attr('height', height);

        parent.append(fullImg);
    }
};

function PopupImageViewer() {}
PopupImageViewer.prototype.view = function (post) {
    var margin = 20; //..change

    var el = post;
    var thumb_id = 'full' + el.find('img').attr('alt');

    var existingPopups = $('#' + thumb_id);
    if(!existingPopups.length) {
        var imgElement= el.find('img');

        var img_w = imgElement.attr('data-width');
        var img_h = imgElement.attr('data-height');

        var win = $(window);

        var win_w = win.width();
        var win_h = win.height();
        //new image size
        if (img_w > win_w) {
            img_h = img_h * (win_w/img_w) - margin;
            img_w = win_w - margin;
        }
        if (img_h > win_h) {
            img_w = img_w * (win_h/img_h) - margin;
            img_h = win_h - margin;
        }

        var img_pv = new Image();
        var newImage = $(img_pv);
        newImage.addClass('img-full')
            .attr('id', thumb_id)
            .attr('src', $(el).attr('href'))
            .appendTo($(el))
            .css({
                'width': img_w,
                'height': img_h,
                'left': (win_w - img_w) / 2,
                'top': ((win_h - img_h) / 2)
            })
        //scaling preview
        .mousewheel(function(event, delta) {
            var cx = event.originalEvent.clientX,
            cy = event.originalEvent.clientY,
            i_w = parseFloat(newImage.width()),
            i_h = parseFloat(newImage.height()),
            newIW = i_w * (delta > 0 ? 1.25 : 0.8),
            newIH = i_h * (delta > 0 ? 1.25 : 0.8);

            newImage.width(newIW);
            newImage.height(newIH);
            //set position
            newImage.css({
                left: parseInt(cx - (newIW/i_w) * (cx - parseInt($(img_pv).position().left, 10)), 10),
                top:  parseInt(cy - (newIH/i_h) * (cy - parseInt($(img_pv).position().top, 10)), 10)
            });

            return false;
        }
        )
            .draggable({
                addClasses: false,
                stack: '.img-full'
            });
    } else {
        existingPopups.remove();
    }
};

function addImgPreview() {
    var viewerName = $('body').attr('data-image-viewer');
    var viewer = ImageViewer();
    for (var i = 0; i < IMAGE_VIEWERS.length; i++) {
        var item = IMAGE_VIEWERS[i];
        if (item[0] === viewerName) {
            viewer = item[1];
            break;
        }
    }

    //keybind
    $(document).on('keyup.removepic', function(e) {
        if(e.which === 27) {
            $('.img-full').remove();
        }
    });

    $('body').on('click', '.thumb', function() {
        viewer.view($(this));

        return false;
    });
}