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// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Provides an in browser PDF editor.
 *
 * @module moodle-assignfeedback_editpdf-editor
 */

/**
 * Class representing a highlight.
 *
 * @namespace M.assignfeedback_editpdf
 * @class annotation
 * @constructor
 */
var ANNOTATION = function(config) {
    ANNOTATION.superclass.constructor.apply(this, [config]);
};

ANNOTATION.NAME = "annotation";
ANNOTATION.ATTRS = {};

Y.extend(ANNOTATION, Y.Base, {
    /**
     * Reference to M.assignfeedback_editpdf.editor.
     * @property editor
     * @type M.assignfeedback_editpdf.editor
     * @public
     */
    editor: null,

/**
     * Grade id
     * @property gradeid
     * @type Int
     * @public
     */
    gradeid: 0,

/**
     * Comment page number
     * @property pageno
     * @type Int
     * @public
     */
    pageno: 0,

/**
     * X position
     * @property x
     * @type Int
     * @public
     */
    x: 0,

/**
     * Y position
     * @property y
     * @type Int
     * @public
     */
    y: 0,

/**
     * Ending x position
     * @property endx
     * @type Int
     * @public
     */
    endx: 0,

/**
     * Ending y position
     * @property endy
     * @type Int
     * @public
     */
    endy: 0,

/**
     * Path
     * @property path
     * @type String - list of points like x1,y1:x2,y2
     * @public
     */
    path: '',

/**
     * Tool.
     * @property type
     * @type String
     * @public
     */
    type: 'rect',

/**
     * Annotation colour.
     * @property colour
     * @type String
     * @public
     */
    colour: 'red',

/**
     * Reference to M.assignfeedback_editpdf.drawable
     * @property drawable
     * @type M.assignfeedback_editpdf.drawable
     * @public
     */
    drawable: false,

/**
     * Initialise the annotation.
     *
     * @method initializer
     * @return void
     */
    initializer: function(config) {
        this.editor = config.editor || null;
        this.gradeid = parseInt(config.gradeid, 10) || 0;
        this.pageno = parseInt(config.pageno, 10) || 0;
        this.x = parseInt(config.x, 10) || 0;
        this.y = parseInt(config.y, 10) || 0;
        this.endx = parseInt(config.endx, 10) || 0;
        this.endy = parseInt(config.endy, 10) || 0;
        this.path = config.path || '';
        this.type = config.type || 'rect';
        this.colour = config.colour || 'red';
        this.drawable = false;
    },

/**
     * Clean a comment record, returning an oject with only fields that are valid.
     * @public
     * @method clean
     * @return {}
     */
    clean: function() {
        return {
            gradeid: this.gradeid,
            x: parseInt(this.x, 10),
            y: parseInt(this.y, 10),
            endx: parseInt(this.endx, 10),
            endy: parseInt(this.endy, 10),
            type: this.type,
            path: this.path,
            pageno: this.pageno,
            colour: this.colour
        };
    },

/**
     * Draw a selection around this annotation if it is selected.
     * @public
     * @method draw_highlight
     * @return M.assignfeedback_editpdf.drawable
     */
    draw_highlight: function() {
        var bounds,
            drawingregion = this.editor.get_dialogue_element(SELECTOR.DRAWINGREGION),
            offsetcanvas = this.editor.get_dialogue_element(SELECTOR.DRAWINGCANVAS).getXY(),
            shape;

if (this.editor.currentannotation === this) {
            // Draw a highlight around the annotation.
            bounds = new M.assignfeedback_editpdf.rect();
            bounds.bound([new M.assignfeedback_editpdf.point(this.x, this.y),
                          new M.assignfeedback_editpdf.point(this.endx, this.endy)]);

shape = this.editor.graphic.addShape({
                type: Y.Rect,
                width: bounds.width,
                height: bounds.height,
                stroke: {
                   weight: STROKEWEIGHT,
                   color: SELECTEDBORDERCOLOUR
                },
                fill: {
                   color: SELECTEDFILLCOLOUR
                },
                x: bounds.x,
                y: bounds.y
            });
            this.drawable.shapes.push(shape);

// Add a delete X to the annotation.
            var deleteicon = Y.Node.create('<img src="' + M.util.image_url('trash', 'assignfeedback_editpdf') + '"/>'),
                deletelink = Y.Node.create('<a href="#" role="button"></a>');

deleteicon.setAttrs({
                'alt': M.util.get_string('deleteannotation', 'assignfeedback_editpdf')
            });
            deleteicon.setStyles({
                'backgroundColor': 'white'
            });
            deletelink.addClass('deleteannotationbutton');
            deletelink.append(deleteicon);

drawingregion.append(deletelink);
            deletelink.setData('annotation', this);

deletelink.on('click', this.remove, this);
            deletelink.on('key', this.remove, 'space,enter', this);

deletelink.setX(offsetcanvas[0] + bounds.x + bounds.width - 18);
            deletelink.setY(offsetcanvas[1] + bounds.y + 6);
            this.drawable.nodes.push(deletelink);
        }
        return this.drawable;
    },

/**
     * Draw an annotation
     * @public
     * @method draw
     * @return M.assignfeedback_editpdf.drawable|false
     */
    draw: function() {
        // Should be overridden by the subclass.
        this.draw_highlight();
        return this.drawable;
    },

/**
     * Delete an annotation
     * @protected
     * @method remove
     * @param event
     */
    remove: function(e) {
        var annotations,
            i;

e.preventDefault();

annotations = this.editor.pages[this.editor.currentpage].annotations;
        for (i = 0; i < annotations.length; i++) {
            if (annotations[i] === this) {
                annotations.splice(i, 1);
                if (this.drawable) {
                    this.drawable.erase();
                }
                this.editor.currentannotation = false;
                this.editor.save_current_page();
                return;
            }
        }
    },

/**
     * Move an annotation to a new location.
     * @public
     * @param int newx
     * @param int newy
     * @method move_annotation
     */
    move: function(newx, newy) {
        var diffx = newx - this.x,
            diffy = newy - this.y,
            newpath, oldpath, xy,
            x, y;

this.x += diffx;
        this.y += diffy;
        this.endx += diffx;
        this.endy += diffy;

if (this.path) {
            newpath = [];
            oldpath = this.path.split(':');
            Y.each(oldpath, function(position) {
                xy = position.split(',');
                x = parseInt(xy[0], 10);
                y = parseInt(xy[1], 10);
                newpath.push((x + diffx) + ',' + (y + diffy));
            });

this.path = newpath.join(':');

}
        if (this.drawable) {
            this.drawable.erase();
        }
        this.editor.drawables.push(this.draw());
    },

/**
     * Draw the in progress edit.
     *
     * @public
     * @method draw_current_edit
     * @param M.assignfeedback_editpdf.edit edit
     */
    draw_current_edit: function(edit) {
        var noop = edit && false;
        // Override me please.
        return noop;
    },

/**
     * Promote the current edit to a real annotation.
     *
     * @public
     * @method init_from_edit
     * @param M.assignfeedback_editpdf.edit edit
     * @return bool if width/height is more than min. required.
     */
    init_from_edit: function(edit) {
        var bounds = new M.assignfeedback_editpdf.rect();
        bounds.bound([edit.start, edit.end]);

this.gradeid = this.editor.get('gradeid');
        this.pageno = this.editor.currentpage;
        this.x = bounds.x;
        this.y = bounds.y;
        this.endx = bounds.x + bounds.width;
        this.endy = bounds.y + bounds.height;
        this.colour = edit.annotationcolour;
        this.path = '';
        return (bounds.has_min_width() && bounds.has_min_height());
    }

});

M.assignfeedback_editpdf = M.assignfeedback_editpdf || {};
M.assignfeedback_editpdf.annotation = ANNOTATION;

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