ui.avatar_cropper.js

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elgg.provide('elgg.avatarCropper');

elgg.avatarCropper.init = function() {
    var params = {
        selectionOpacity: 0,
        aspectRatio: '1:1',
        onSelectEnd: elgg.avatarCropper.selectChange,
        onSelectChange: elgg.avatarCropper.preview
    };

    if ($('input[name=x2]').val()) {
        params.x1 = $('input[name=x1]').val();
        params.x2 = $('input[name=x2]').val();
        params.y1 = $('input[name=y1]').val();
        params.y2 = $('input[name=y2]').val();
    }

    $('#user-avatar-cropper').imgAreaSelect(params);

    if ($('input[name=x2]').val()) {

        // TODO figure out why this is necessary
        $(window).on('load', function () {
            var ias = $('#user-avatar-cropper').imgAreaSelect({instance: true});
            var selection = ias.getSelection();
            elgg.avatarCropper.preview($('#user-avatar-cropper'), selection);
        });
    }
};

elgg.avatarCropper.preview = function(img, selection) {
    // catch for the first click on the image
    if (selection.width === 0 || selection.height === 0) {
        return;
    }

    var origWidth = $("#user-avatar-cropper").width();
    var origHeight = $("#user-avatar-cropper").height();
    var scaleX = 100 / selection.width;
    var scaleY = 100 / selection.height;
    $('#user-avatar-preview > img').css({
        width: Math.round(scaleX * origWidth) + 'px',
        height: Math.round(scaleY * origHeight) + 'px',
        marginLeft: '-' + Math.round(scaleX * selection.x1) + 'px',
        marginTop: '-' + Math.round(scaleY * selection.y1) + 'px'
    });
};

elgg.avatarCropper.selectChange = function(img, selection) {
    $('input[name=x1]').val(selection.x1);
    $('input[name=x2]').val(selection.x2);
    $('input[name=y1]').val(selection.y1);
    $('input[name=y2]').val(selection.y2);
};

elgg.register_hook_handler('init', 'system', elgg.avatarCropper.init);