[IMP] web: add pager widget to web client

This pager is used by the kanban view. It could be used by the list
view, the form view and some others (and it is, in the enterprise
edition)

2 files changed, 120 insertions, 0 deletions

diff --git a/addons/web/static/src/js/widgets/pager.js b/addons/web/static/src/js/widgets/pager.js
new file mode 100644
index 00000000000..c195aaf530d
--- /dev/null
+++ b/addons/web/static/src/js/widgets/pager.js
@@ -0,0 +1,111 @@
+odoo.define('web.Pager', function (require) {
+"use strict";
+
+var Widget = require('web.Widget');
+
+var direction = {
+    previous: -1,
+    next: 1,
+};
+
+var Pager = Widget.extend({
+    template: "Pager",
+
+    events: {
+        'click .o-pager-previous': 'previous',
+        'click .o-pager-next': 'next',
+    },
+
+    // pager goes from 1 to size (included).
+    // current value is current_min (if limit === 1)
+    //              or the interval [current_min, current_min + limit[ if limit > 1
+    init: function (parent, size, current_min, limit, options) {
+        this.state = {
+            size: size,
+            current_min: current_min,
+            limit: limit,
+        };
+        Object.defineProperty(this.state, 'current_max', {
+            get: function() {
+                return Math.min(this.current_min + this.limit - 1, this.size);
+            }
+        });
+        this.options = options || {};
+        this._super(parent);
+    },
+
+    start: function () {
+        this.$content = this.$('.o-pager-value');
+        this._render();
+        return this._super();
+    },
+
+    set_state: function (options) {
+        _.extend(this.state, options);
+        this._render();
+    },
+
+    previous: function(e) {
+        this._change_selection(direction.previous);
+    },
+
+    next: function() {
+        this._change_selection(direction.next);
+    },
+
+    disable: function() {
+        this.$('button').prop("disabled", true);
+    },
+
+    enable: function() {
+        this.$('button').prop("disabled", false);
+    },
+
+    _render: function () {
+        var state;
+        var size = this.state.size;
+        var current_min = this.state.current_min;
+        var current_max = this.state.current_max;
+        var single_page = 1 === current_min && current_max === size;
+
+        if (size === 0 || (single_page && this.options.single_page_hidden)) {
+            this.$el.hide();
+        } else {
+            this.$el.show();
+
+            if (single_page) {
+                this.disable();
+            } else {
+                this.enable();
+            }
+
+            if (this.state.limit === 1) {
+                state = "" + current_min + " / " + size;
+            } else {
+                state = "" + current_min + "-" + current_max + " / " + size;
+            }
+            this.$content.html(state);
+        }
+    },
+
+    _change_selection: function (direction) {
+        var size = this.state.size;
+        var current_min = this.state.current_min;
+        var limit = this.state.limit;
+        current_min = (current_min + limit*direction);
+        if (current_min > size) {
+            current_min = 1;
+        } else if ((current_min < 1) && (limit === 1)) {
+            current_min = size;
+        } else if ((current_min < 1) && (limit > 1)) {
+            current_min = size - ((size % limit) || limit) + 1;
+        }
+        this.state.current_min = current_min;
+        this.trigger('pager_changed', _.clone(this.state));
+        this._render();
+    },
+});
+
+return Pager;
+
+});
\ No newline at end of file
diff --git a/addons/web/static/src/xml/base.xml b/addons/web/static/src/xml/base.xml
index 00406837a47..27ce7dae6d4 100644
--- a/addons/web/static/src/xml/base.xml
+++ b/addons/web/static/src/xml/base.xml
@@ -1946,6 +1946,15 @@
     <img t-attf-src="#{prefix}/web/static/src/img/icons/#{widget.icon}.png"
     t-att-alt="widget.string"/>
 </button>
+
+<div t-name="Pager">
+    <span class="o-pager-value"></span>
+    <span class="btn-group btn-group-sm">
+        <button type="button" class="fa fa-chevron-left btn btn-icon o-pager-previous" accesskey="O"/>
+        <button type="button" class="fa fa-chevron-right btn btn-icon o-pager-next" accesskey="P"/>
+    </span>
+</div>
+
 <button t-name="FieldToggleBoolean" type="button"
     t-att-title="widget.string" class="oe_toggle_button">
     <img t-attf-src="#{_s}/web/static/src/img/icons/#{widget.icon}" t-att-alt="widget.string"/>