[IMP] todo: make the name of a to-do editable from the breadcrumbs

In the module note, the name of a note was automatically computed based
on the begining of its content. Fot the module todo, we want the name to
be editable in the form view, while still keeping a clean interface for
the form. This commit makes therefore the name of a to-do directly
editable in the breadcrumbs. The behavior is a mix between the editable
breadcrumb name in Spreadsheet and the classical edition behavior for a
field in a form view, i.e:
- When creating a new to-do, a placeholder for the name is set to
  _Untitled to-do_. A name must be entered before saving the record.
- A name entered in the Breadcrumb will be saved either if the save
  button is pressed, either when the form view is quit.
- The discard button allows to go back to the last saved name.

The implementation relies, for its biggest part, on a new component
inheriting _CharField_ that copies some functions from the component
_SpreadsheetName_ used in Spreadsheet (see task-2621549) for the edition
part and use the autoResize hook from discuss recently moved into the
framework (see https://github.com/odoo/odoo/pull/117355).

The rest of the implementation consists of overrides of
_FormControlPanel_, _FormController_ and _formView_ to adapt the use of
this input field in the context of a form view (>< Spreadsheet).

task-3085077

addons/todo/__manifest__.py

@@ -23,6 +23,7 @@
     'uninstall_hook': '_todo_uninstall',
     'assets': {
         'web.assets_backend': [
+            'todo/static/src/components/**/*',
             'todo/static/src/scss/todo.scss',
             'todo/static/src/views/**/*',
             'todo/static/src/web/**/*',

addons/todo/static/src/components/todo_editable_breadcrumb_name/todo_editable_breadcrumb_name.js

@@ -0,0 +1,57 @@
+/** @odoo-module */
+
+import { useState, onRendered, useRef } from "@odoo/owl";
+
+import { _lt } from "@web/core/l10n/translation";
+import { CharField } from "@web/views/fields/char/char_field";
+import { useAutoresize } from "@web/core/utils/autoresize";
+
+export class TodoEditableBreadcrumbName extends CharField {
+    setup() {
+        super.setup();
+        this.placeholder = _lt("Untitled to-do");;
+        this.input = useRef("input");
+
+        this.stateTodo = useState({
+            isUntitled: true,
+        });
+
+        onRendered(() => {
+            this.stateTodo.isUntitled = this._isUntitled(this.props.record.data[this.props.name]);
+        });
+        useAutoresize(this.input);
+    }
+
+    /**
+     * Check if the name is empty or is the generic name
+     * for untitled todos.
+     * @param {string} name
+     * @returns {boolean}
+     */
+    _isUntitled(name) {
+        name = name && name.trim();
+        return !name || name === this.placeholder.toString();
+    }
+
+    /**
+     * @private
+     * @param {InputEvent} ev
+     */
+    _onFocus(ev) {
+        if (this._isUntitled(ev.target.value)) {
+            ev.target.value = this.placeholder;
+            ev.target.select();
+        }
+    }
+
+    /**
+     * @private
+     * @param {InputEvent} ev
+     */
+    _onInput(ev) {
+        const value = ev.target.value;
+        this.stateTodo.isUntitled = this._isUntitled(value);
+    }
+}
+
+TodoEditableBreadcrumbName.template = 'todo.TodoEditableBreadcrumbName';

addons/todo/static/src/components/todo_editable_breadcrumb_name/todo_editable_breadcrumb_name.scss

@@ -0,0 +1,30 @@
+.o_todo_breadcrumb_name_input{
+    width: 100%;
+    text-overflow: clip;
+    overflow: hidden;
+    border: none;
+    padding: 0px 5px 0px 2px;
+    color: $o-brand-secondary;
+
+    &:focus {
+        outline: 1px solid #ccc;
+        outline-offset: -1px;
+        color: $dark;
+    }
+
+    &.o-todo-untitled {
+        font-style: italic;
+    }
+
+    &.o-todo-untitled:focus {
+        font-style: normal;
+    }
+
+    &:disabled {
+        background-color: inherit;
+    }
+}
+
+.o_todo_breadcrumb_name_input:hover {
+    border-bottom: $input-border-width solid $o-brand-primary;
+}

addons/todo/static/src/components/todo_editable_breadcrumb_name/todo_editable_breadcrumb_name.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<templates xml:space="preserve">
+
+    <t t-name="todo.TodoEditableBreadcrumbName" t-inherit="web.CharField" t-inherit-mode="primary" owl="1">
+        <xpath expr="//input[hasclass('o_input')]" position="attributes">
+            <attribute name="class">o_input o_todo_breadcrumb_name_input</attribute>
+            <attribute name="t-on-focus">_onFocus</attribute>
+            <attribute name="t-att-placeholder">placeholder</attribute>
+            <attribute name="t-on-input">_onInput</attribute>
+            <attribute name="t-att-class">stateTodo.isUntitled ? 'o-todo-untitled' : ''</attribute>
+        </xpath>
+    </t>
+
+</templates>

addons/todo/static/src/views/todo_form/todo_form_control_panel.js

@@ -0,0 +1,7 @@
+/** @odoo-module **/
+
+import { ControlPanel } from "@web/search/control_panel/control_panel";
+
+export class TodoFormControlPanel extends ControlPanel {
+    static template = "todo.TodoFormControlPanel";
+}

addons/todo/static/src/views/todo_form/todo_form_control_panel.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<templates xml:space="preserve">
+
+    <t t-name="todo.TodoFormControlPanel" t-inherit="web.ControlPanel" t-inherit-mode="primary" owl="1">
+        <xpath expr="//div/t/t[@t-slot='control-panel-breadcrumb']" position="replace">
+            <t t-slot="control-panel-breadcrumb">
+                <t t-call="todo.TodoBreadcrumbs"/>
+            </t>
+        </xpath>
+
+    </t>
+
+    <t t-name="todo.TodoBreadcrumbs" t-inherit="web.Breadcrumbs" t-inherit-mode="primary" owl="1">
+        <xpath expr="//div[hasclass('o_last_breadcrumb_item')]//span" position="replace">
+            <t t-slot="control-panel-todo-name" />
+        </xpath>
+    </t>
+
+
+</templates>

addons/todo/static/src/views/todo_form/todo_form_controller.js

@@ -0,0 +1,14 @@
+/** @odoo-module **/
+
+import { FormController } from "@web/views/form/form_controller";
+import { TodoEditableBreadcrumbName } from "@todo/components/todo_editable_breadcrumb_name/todo_editable_breadcrumb_name";
+
+/**
+ *  The FormController is overridden to be able to manage the edition of the name of a to-do directly
+ *  in the breadcrumb.
+ */
+
+export class TodoFormController extends FormController {}
+
+Object.assign(TodoFormController.components, { TodoEditableBreadcrumbName });
+TodoFormController.template = 'todo.TodoFormView';

addons/todo/static/src/views/todo_form/todo_form_controller.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<templates xml:space="preserve">
+
+    <t t-name="todo.TodoFormView" t-inherit="web.FormView" t-inherit-mode="primary" owl="1">
+        
+        <xpath expr="//div[hasclass('o_form_view_container')]/Layout" position="inside">
+            <t t-set-slot="control-panel-todo-name">
+                <t t-set="record" t-value="model.root"/>
+                <TodoEditableBreadcrumbName
+                    name="'name'"
+                    record="record"
+                    id="'name'"
+                />
+            </t>
+        </xpath>
+    </t>
+
+</templates>

addons/todo/static/src/views/todo_form/todo_form_view.js

@@ -0,0 +1,14 @@
+/** @odoo-module **/
+
+import { registry } from "@web/core/registry";
+import { formView } from "@web/views/form/form_view";
+import { TodoFormControlPanel } from "./todo_form_control_panel";
+import { TodoFormController } from "./todo_form_controller";
+
+export const todoFormView = {
+    ...formView,
+    ControlPanel: TodoFormControlPanel,
+    Controller: TodoFormController,
+};
+
+registry.category("views").add("todo_form", todoFormView);

addons/todo/views/project_task_views.xml

@@ -98,6 +98,7 @@
             <form string="To-do"
                   class="o_todo_form_view"
                   js_class="todo_form">
+                <field name="name" invisible="1"/>
                 <header>
                     <div class="py-1 px-2 border rounded bg-view">
                         <field name="tag_ids"