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diff --git a/addons/website/static/src/snippets/s_image_gallery/options.js b/addons/website/static/src/snippets/s_image_gallery/options.js
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+++ b/addons/website/static/src/snippets/s_image_gallery/options.js
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+odoo.define('website.s_image_gallery_options', function (require) {
+'use strict';
+
+var core = require('web.core');
+var weWidgets = require('wysiwyg.widgets');
+var options = require('web_editor.snippets.options');
+
+var _t = core._t;
+var qweb = core.qweb;
+
+options.registry.gallery = options.Class.extend({
+    xmlDependencies: ['/website/static/src/snippets/s_image_gallery/000.xml'],
+
+    /**
+     * @override
+     */
+    start: function () {
+        var self = this;
+
+        // Make sure image previews are updated if images are changed
+        this.$target.on('image_changed', 'img', function (ev) {
+            var $img = $(ev.currentTarget);
+            var index = self.$target.find('.carousel-item.active').index();
+            self.$('.carousel:first li[data-target]:eq(' + index + ')')
+                .css('background-image', 'url(' + $img.attr('src') + ')');
+        });
+
+        // When the snippet is empty, an edition button is the default content
+        // TODO find a nicer way to do that to have editor style
+        this.$target.on('click', '.o_add_images', function (e) {
+            e.stopImmediatePropagation();
+            self.addImages(false);
+        });
+
+        this.$target.on('dropped', 'img', function (ev) {
+            self.mode(null, self.getMode());
+            if (!ev.target.height) {
+                $(ev.target).one('load', function () {
+                    setTimeout(function () {
+                        self.trigger_up('cover_update');
+                    });
+                });
+            }
+        });
+
+        const $container = this.$('> .container, > .container-fluid, > .o_container_small');
+        if ($container.find('> *:not(div)').length) {
+            self.mode(null, self.getMode());
+        }
+
+        return this._super.apply(this, arguments);
+    },
+    /**
+     * @override
+     */
+    onBuilt: function () {
+        if (this.$target.find('.o_add_images').length) {
+            this.addImages(false);
+        }
+        // TODO should consider the async parts
+        this._adaptNavigationIDs();
+    },
+    /**
+     * @override
+     */
+    onClone: function () {
+        this._adaptNavigationIDs();
+    },
+    /**
+     * @override
+     */
+    cleanForSave: function () {
+        if (this.$target.hasClass('slideshow')) {
+            this.$target.removeAttr('style');
+        }
+    },
+
+    //--------------------------------------------------------------------------
+    // Options
+    //--------------------------------------------------------------------------
+
+    /**
+     * Allows to select images to add as part of the snippet.
+     *
+     * @see this.selectClass for parameters
+     */
+    addImages: function (previewMode) {
+        const $images = this.$('img');
+        var $container = this.$('> .container, > .container-fluid, > .o_container_small');
+        var dialog = new weWidgets.MediaDialog(this, {multiImages: true, onlyImages: true, mediaWidth: 1920});
+        var lastImage = _.last(this._getImages());
+        var index = lastImage ? this._getIndex(lastImage) : -1;
+        return new Promise(resolve => {
+            dialog.on('save', this, function (attachments) {
+                for (var i = 0; i < attachments.length; i++) {
+                    $('<img/>', {
+                        class: $images.length > 0 ? $images[0].className : 'img img-fluid d-block ',
+                        src: attachments[i].image_src,
+                        'data-index': ++index,
+                        alt: attachments[i].description || '',
+                        'data-name': _t('Image'),
+                        style: $images.length > 0 ? $images[0].style.cssText : '',
+                    }).appendTo($container);
+                }
+                if (attachments.length > 0) {
+                    this.mode('reset', this.getMode());
+                    this.trigger_up('cover_update');
+                }
+            });
+            dialog.on('closed', this, () => resolve());
+            dialog.open();
+        });
+    },
+    /**
+     * Allows to change the number of columns when displaying images with a
+     * grid-like layout.
+     *
+     * @see this.selectClass for parameters
+     */
+    columns: function (previewMode, widgetValue, params) {
+        const nbColumns = parseInt(widgetValue || '1');
+        this.$target.attr('data-columns', nbColumns);
+
+        this.mode(previewMode, this.getMode(), {}); // TODO improve
+    },
+    /**
+     * Get the image target's layout mode (slideshow, masonry, grid or nomode).
+     *
+     * @returns {String('slideshow'|'masonry'|'grid'|'nomode')}
+     */
+    getMode: function () {
+        var mode = 'slideshow';
+        if (this.$target.hasClass('o_masonry')) {
+            mode = 'masonry';
+        }
+        if (this.$target.hasClass('o_grid')) {
+            mode = 'grid';
+        }
+        if (this.$target.hasClass('o_nomode')) {
+            mode = 'nomode';
+        }
+        return mode;
+    },
+    /**
+     * Displays the images with the "grid" layout.
+     */
+    grid: function () {
+        var imgs = this._getImages();
+        var $row = $('<div/>', {class: 'row s_nb_column_fixed'});
+        var columns = this._getColumns();
+        var colClass = 'col-lg-' + (12 / columns);
+        var $container = this._replaceContent($row);
+
+        _.each(imgs, function (img, index) {
+            var $img = $(img);
+            var $col = $('<div/>', {class: colClass});
+            $col.append($img).appendTo($row);
+            if ((index + 1) % columns === 0) {
+                $row = $('<div/>', {class: 'row s_nb_column_fixed'});
+                $row.appendTo($container);
+            }
+        });
+        this.$target.css('height', '');
+    },
+    /**
+     * Displays the images with the "masonry" layout.
+     */
+    masonry: function () {
+        var self = this;
+        var imgs = this._getImages();
+        var columns = this._getColumns();
+        var colClass = 'col-lg-' + (12 / columns);
+        var cols = [];
+
+        var $row = $('<div/>', {class: 'row s_nb_column_fixed'});
+        this._replaceContent($row);
+
+        // Create columns
+        for (var c = 0; c < columns; c++) {
+            var $col = $('<div/>', {class: 'o_masonry_col o_snippet_not_selectable ' + colClass});
+            $row.append($col);
+            cols.push($col[0]);
+        }
+
+        // Dispatch images in columns by always putting the next one in the
+        // smallest-height column
+        while (imgs.length) {
+            var min = Infinity;
+            var $lowest;
+            _.each(cols, function (col) {
+                var $col = $(col);
+                var height = $col.is(':empty') ? 0 : $col.find('img').last().offset().top + $col.find('img').last().height() - self.$target.offset().top;
+                if (height < min) {
+                    min = height;
+                    $lowest = $col;
+                }
+            });
+            $lowest.append(imgs.shift());
+        }
+    },
+    /**
+     * Allows to change the images layout. @see grid, masonry, nomode, slideshow
+     *
+     * @see this.selectClass for parameters
+     */
+    mode: function (previewMode, widgetValue, params) {
+        widgetValue = widgetValue || 'slideshow'; // FIXME should not be needed
+        this.$target.css('height', '');
+        this.$target
+            .removeClass('o_nomode o_masonry o_grid o_slideshow')
+            .addClass('o_' + widgetValue);
+        this[widgetValue]();
+        this.trigger_up('cover_update');
+        this._refreshPublicWidgets();
+    },
+    /**
+     * Displays the images with the standard layout: floating images.
+     */
+    nomode: function () {
+        var $row = $('<div/>', {class: 'row s_nb_column_fixed'});
+        var imgs = this._getImages();
+
+        this._replaceContent($row);
+
+        _.each(imgs, function (img) {
+            var wrapClass = 'col-lg-3';
+            if (img.width >= img.height * 2 || img.width > 600) {
+                wrapClass = 'col-lg-6';
+            }
+            var $wrap = $('<div/>', {class: wrapClass}).append(img);
+            $row.append($wrap);
+        });
+    },
+    /**
+     * Allows to remove all images. Restores the snippet to the way it was when
+     * it was added in the page.
+     *
+     * @see this.selectClass for parameters
+     */
+    removeAllImages: function (previewMode) {
+        var $addImg = $('<div>', {
+            class: 'alert alert-info css_non_editable_mode_hidden text-center',
+        });
+        var $text = $('<span>', {
+            class: 'o_add_images',
+            style: 'cursor: pointer;',
+            text: _t(" Add Images"),
+        });
+        var $icon = $('<i>', {
+            class: ' fa fa-plus-circle',
+        });
+        this._replaceContent($addImg.append($icon).append($text));
+    },
+    /**
+     * Displays the images with a "slideshow" layout.
+     */
+    slideshow: function () {
+        const imageEls = this._getImages();
+        const images = _.map(imageEls, img => ({
+            // Use getAttribute to get the attribute value otherwise .src
+            // returns the absolute url.
+            src: img.getAttribute('src'),
+            alt: img.getAttribute('alt'),
+        }));
+        var currentInterval = this.$target.find('.carousel:first').attr('data-interval');
+        var params = {
+            images: images,
+            index: 0,
+            title: "",
+            interval: currentInterval || 0,
+            id: 'slideshow_' + new Date().getTime(),
+            attrClass: imageEls.length > 0 ? imageEls[0].className : '',
+            attrStyle: imageEls.length > 0 ? imageEls[0].style.cssText : '',
+        },
+        $slideshow = $(qweb.render('website.gallery.slideshow', params));
+        this._replaceContent($slideshow);
+        _.each(this.$('img'), function (img, index) {
+            $(img).attr({contenteditable: true, 'data-index': index});
+        });
+        this.$target.css('height', Math.round(window.innerHeight * 0.7));
+
+        // Apply layout animation
+        this.$target.off('slide.bs.carousel').off('slid.bs.carousel');
+        this.$('li.fa').off('click');
+    },
+
+    //--------------------------------------------------------------------------
+    // Public
+    //--------------------------------------------------------------------------
+
+    /**
+     * Handles image removals and image index updates.
+     *
+     * @override
+     */
+    notify: function (name, data) {
+        this._super(...arguments);
+        if (name === 'image_removed') {
+            data.$image.remove(); // Force the removal of the image before reset
+            this.mode('reset', this.getMode());
+        } else if (name === 'image_index_request') {
+            var imgs = this._getImages();
+            var position = _.indexOf(imgs, data.$image[0]);
+            imgs.splice(position, 1);
+            switch (data.position) {
+                case 'first':
+                    imgs.unshift(data.$image[0]);
+                    break;
+                case 'prev':
+                    imgs.splice(position - 1, 0, data.$image[0]);
+                    break;
+                case 'next':
+                    imgs.splice(position + 1, 0, data.$image[0]);
+                    break;
+                case 'last':
+                    imgs.push(data.$image[0]);
+                    break;
+            }
+            position = imgs.indexOf(data.$image[0]);
+            _.each(imgs, function (img, index) {
+                // Note: there might be more efficient ways to do that but it is
+                // more simple this way and allows compatibility with 10.0 where
+                // indexes were not the same as positions.
+                $(img).attr('data-index', index);
+            });
+            const currentMode = this.getMode();
+            this.mode('reset', currentMode);
+            if (currentMode === 'slideshow') {
+                const $carousel = this.$target.find('.carousel');
+                $carousel.removeClass('slide');
+                $carousel.carousel(position);
+                this.$target.find('.carousel-indicators li').removeClass('active');
+                this.$target.find('.carousel-indicators li[data-slide-to="' + position + '"]').addClass('active');
+                this.trigger_up('activate_snippet', {
+                    $snippet: this.$target.find('.carousel-item.active img'),
+                    ifInactiveOptions: true,
+                });
+                $carousel.addClass('slide');
+            } else {
+                this.trigger_up('activate_snippet', {
+                    $snippet: data.$image,
+                    ifInactiveOptions: true,
+                });
+            }
+        }
+    },
+
+    //--------------------------------------------------------------------------
+    // Private
+    //--------------------------------------------------------------------------
+
+    /**
+     * @private
+     */
+    _adaptNavigationIDs: function () {
+        var uuid = new Date().getTime();
+        this.$target.find('.carousel').attr('id', 'slideshow_' + uuid);
+        _.each(this.$target.find('[data-slide], [data-slide-to]'), function (el) {
+            var $el = $(el);
+            if ($el.attr('data-target')) {
+                $el.attr('data-target', '#slideshow_' + uuid);
+            } else if ($el.attr('href')) {
+                $el.attr('href', '#slideshow_' + uuid);
+            }
+        });
+    },
+    /**
+     * @override
+     */
+    _computeWidgetState: function (methodName, params) {
+        switch (methodName) {
+            case 'mode': {
+                let activeModeName = 'slideshow';
+                for (const modeName of params.possibleValues) {
+                    if (this.$target.hasClass(`o_${modeName}`)) {
+                        activeModeName = modeName;
+                        break;
+                    }
+                }
+                this.activeMode = activeModeName;
+                return activeModeName;
+            }
+            case 'columns': {
+                return `${this._getColumns()}`;
+            }
+        }
+        return this._super(...arguments);
+    },
+    /**
+     * @private
+     */
+    async _computeWidgetVisibility(widgetName, params) {
+        if (widgetName === 'slideshow_mode_opt') {
+            return false;
+        }
+        return this._super(...arguments);
+    },
+    /**
+     * Returns the images, sorted by index.
+     *
+     * @private
+     * @returns {DOMElement[]}
+     */
+    _getImages: function () {
+        var imgs = this.$('img').get();
+        var self = this;
+        imgs.sort(function (a, b) {
+            return self._getIndex(a) - self._getIndex(b);
+        });
+        return imgs;
+    },
+    /**
+     * Returns the index associated to a given image.
+     *
+     * @private
+     * @param {DOMElement} img
+     * @returns {integer}
+     */
+    _getIndex: function (img) {
+        return img.dataset.index || 0;
+    },
+    /**
+     * Returns the currently selected column option.
+     *
+     * @private
+     * @returns {integer}
+     */
+    _getColumns: function () {
+        return parseInt(this.$target.attr('data-columns')) || 3;
+    },
+    /**
+     * Empties the container, adds the given content and returns the container.
+     *
+     * @private
+     * @param {jQuery} $content
+     * @returns {jQuery} the main container of the snippet
+     */
+    _replaceContent: function ($content) {
+        var $container = this.$('> .container, > .container-fluid, > .o_container_small');
+        $container.empty().append($content);
+        return $container;
+    },
+});
+
+options.registry.gallery_img = options.Class.extend({
+    /**
+     * Rebuilds the whole gallery when one image is removed.
+     *
+     * @override
+     */
+    onRemove: function () {
+        this.trigger_up('option_update', {
+            optionName: 'gallery',
+            name: 'image_removed',
+            data: {
+                $image: this.$target,
+            },
+        });
+    },
+
+    //--------------------------------------------------------------------------
+    // Options
+    //--------------------------------------------------------------------------
+
+    /**
+     * Allows to change the position of an image (its order in the image set).
+     *
+     * @see this.selectClass for parameters
+     */
+    position: function (previewMode, widgetValue, params) {
+        this.trigger_up('option_update', {
+            optionName: 'gallery',
+            name: 'image_index_request',
+            data: {
+                $image: this.$target,
+                position: widgetValue,
+            },
+        });
+    },
+});
+});