Refactor JavaScript example to use template project (#4758)

* Refactor JavaScript example to use template project

* Feedback

* Update docs/tutorial/node/src/getting_started.md

Co-authored-by: Simon Hausmann <simon.hausmann@slint.dev>

docs/tutorial/node/src/conclusion.md

@@ -1,12 +1,14 @@
 <!-- Copyright © SixtyFPS GmbH <info@slint.dev> ; SPDX-License-Identifier: MIT -->
+
 # Conclusion
 
-In this tutorial, we have demonstrated how to combine some built-in Slint elements with JavaScript code to build a little
+This tutorial showed you how to combine built-in Slint elements with Rust code to build a
-game. There are many more features that we haven't talked about, such as layouts, widgets, or styling.
+game. There is much more to Slint, such as layouts, widgets, or styling.
 
 We recommend the following links to continue:
 
-  * [Examples](https://github.com/slint-ui/slint/tree/master/examples): In the Slint repository we have collected a few demos and examples. These are a great starting point to learn how to use many Slint features.
+-   [Examples](https://github.com/slint-ui/slint/tree/master/examples): In the Slint repository we have collected several demos and examples. These are a great starting point to learn how to use many Slint features.
-    * [Todo Example](https://github.com/slint-ui/slint/tree/master/examples/todo): This is one of the examples that implements a classic use-case.
+    -   [Todo Example](https://github.com/slint-ui/slint/tree/master/examples/todo): This is one of the examples that implements a classic use-case.
-    * [Memory Puzzle](https://github.com/slint-ui/slint/tree/master/examples/memory): This is a slightly more polished version of the code in this example. And you can <a href="https://slint.dev/demos/memory/" target="_blank">play the wasm version</a> in your browser.
+    -   [Memory Puzzle](https://github.com/slint-ui/slint/tree/master/examples/memory): This is a slightly more polished version of the code in this example and you can <a href="https://slint.dev/demos/memory/" target="_blank">play the wasm version</a> in your browser.
-  * [Slint API Docs](https://slint.dev/docs/node/): The reference documentation for the NodeJS library.
+-   [Slint API Docs](https://slint.dev/docs/rust/slint/): The reference documentation for the main Rust crate.
+-   [Slint Interpreter API Docs](https://slint.dev/docs/rust/slint_interpreter/): The reference documentation for Rust crate that allows you to dynamically load Slint files.

docs/tutorial/node/src/creating_the_tiles_from_js.md

@@ -1,20 +1,25 @@
 <!-- Copyright © SixtyFPS GmbH <info@slint.dev> ; SPDX-License-Identifier: MIT -->
+
 # Creating The Tiles From JavaScript
 
-What we'll do is take the list of tiles declared in the .slint language, duplicate it, and shuffle it.
+This step places the game tiles randomly.
-We'll do so by accessing the `memory_tiles` property through the JavaScript code - in our case `memory_tiles`.
-Since `memory_tiles` is an array in the `.slint` language, it's represented as a JavaScript [`Array`](https://slint.dev/docs/node/).
-We can't modify the model generated by the .slint, but we can extract the tiles from it, and put it
-in a [`slint.ArrayModel`](https://slint.dev/docs/node/classes/arraymodel.html) which implements the [`Model`](https://slint.dev/docs/node/interfaces/model.html) interface.
-`ArrayModel` allows us to make modifications and we can use it to replace the static generated model.
 
-We modify `main.js` like so:
+The code takes the list of tiles, duplicates it, and shuffles it, accessing the `memory_tiles` property through the JavaScript code.
+
+As `memory_tiles` is an array, it's represented as a JavaScript [`Array`](https://slint.dev/docs/node/).
+You can't change the model generated by Slint, but you can extract the tiles from it, and put them
+in a [`slint.ArrayModel`](https://slint.dev/docs/node/classes/arraymodel.html) which implements the [`Model`](https://slint.dev/docs/node/interfaces/model.html) interface.
+`ArrayModel` allows you to make changes and you can use it to replace the static generated model.
+
+Change `main.js` to the following:
 
 ```js
 {{#include main_tiles_from_js.js:main}}
 ```
 
-Running this gives us a window on the screen that now shows a 4 by 4 grid of rectangles, which can show or obscure
+Running this code opens a window that now shows a 4 by 4 grid of rectangles, which show or hide
-the icons when clicking. There's only one last aspect missing now, the rules for the game.
+the icons when a player clicks on them.
+
+There's one last aspect missing now, the rules for the game.
 
 <video autoplay loop muted playsinline src="https://slint.dev/blog/memory-game-tutorial/creating-the-tiles-from-rust.mp4"></video>

docs/tutorial/node/src/from_one_to_multiple_tiles.md

@@ -1,34 +1,40 @@
 <!-- Copyright © SixtyFPS GmbH <info@slint.dev> ; SPDX-License-Identifier: MIT -->
+
 # From One To Multiple Tiles
 
-After modeling a single tile, let's create a grid of them. For the grid to be our game board, we need two features:
+After modeling a single tile, this step creates a grid of them. For the grid to be a game board, you need two features:
 
-1. A data model: This shall be an array where each element describes the tile data structure, such as the
+1. **A data model**: An array created as a Rust model, where each element describes the tile data structure, such as:
-   url of the image, whether the image shall be visible and if this tile has been solved. We modify the model
-   from JS code.
-2. A way of creating many instances of the tiles, with the above `.slint` markup code.
 
-In Slint we can declare an array of structures using brackets, to create a model. We can use the <span class="hljs-keyword">for</span> loop
+    - URL of the image
-to create many instances of the same element. In `.slint` the for loop is declarative and automatically updates when
+    - Whether the image is visible
-the model changes. We instantiate all the different <span class="hljs-title">MemoryTile</span> elements and place them on a grid based on their
+    - If the player has solved this tile.
-index with a little bit of spacing between the tiles.
 
-First, we copy the tile data structure definition and paste it at top inside the `memory.slint` file:
+2. A way of creating multiple instances of the tiles.
+
+With Slint you declare an array of structures based on a model using square brackets. Use a <span class="hljs-keyword">for</span> loop
+to create multiple instances of the same element.
+
+With Slint the for loop is declarative and automatically updates when
+the model changes. The loop instantiates all the <span class="hljs-title">MemoryTile</span> elements and places them on a grid based on their
+index with spacing between the tiles.
+
+First, add the tile data structure definition at the top of the `memory.slint` file:
 
 ```slint
 {{#include ../../rust/src/main_multiple_tiles.rs:tile_data}}
 ```
 
-Next, we replace the _export component <span class="hljs-title">MainWindow</span> inherits Window { ... }_ section at the bottom of the `memory.slint` file with the following snippet:
+Next, replace the _export component <span class="hljs-title">MainWindow</span> inherits Window { ... }_ section at the bottom of the `memory.slint` file with the following:
 
 ```slint
 {{#include ../../rust/src/main_multiple_tiles.rs:main_window}}
 ```
 
 The <code><span class="hljs-keyword">for</span> tile\[i\] <span class="hljs-keyword">in</span> memory_tiles:</code> syntax declares a variable `tile` which contains the data of one element from the `memory_tiles` array,
-and a variable `i` which is the index of the tile. We use the `i` index to calculate the position of tile based on its row and column,
+and a variable `i` which is the index of the tile. The code uses the `i` index to calculate the position of a tile, based on its row and column,
-using the modulo and integer division to create a 4 by 4 grid.
+using modulo and integer division to create a 4 by 4 grid.
 
-Running this gives us a window that shows 8 tiles, which can be opened individually.
+Running the code opens a window that shows 8 tiles, which a player can open individually.
 
 <video autoplay loop muted playsinline src="https://slint.dev/blog/memory-game-tutorial/from-one-to-multiple-tiles.mp4"></video>

docs/tutorial/node/src/game_logic_in_js.md

@@ -1,33 +1,37 @@
 <!-- Copyright © SixtyFPS GmbH <info@slint.dev> ; SPDX-License-Identifier: MIT -->
+
 # Game Logic In JavaScript
 
-We'll implement the rules of the game in JavaScript as well. The general philosophy of Slint is that merely the user
+This step implements the rules of the game in Rust as well.
-interface is implemented in the `.slint` language and the business logic in your favorite programming
-language. The game rules shall enforce that at most two tiles have their curtain open. If the tiles match, then we
-consider them solved and they remain open. Otherwise we wait for a little while, so the player can memorize
-the location of the icons, and then close them again.
 
-We'll modify the `.slint` markup in the `memory.slint` file to signal to the JavaScript code when the user clicks on a tile.
+Slint's general philosophy is that you implement the user interface in Slint and the business logic in your favorite programming
-Two changes to <span class="hljs-title">MainWindow</span> are needed: We need to add a way for the MainWindow to call to the JavaScript code that it should
+language.
-check if a pair of tiles has been solved. And we need to add a property that JavaScript code can toggle to disable further
+
-tile interaction, to prevent the player from opening more tiles than allowed. No cheating allowed! First, we paste
+The game rules enforce that at most two tiles have their curtain open. If the tiles match, then the game
-the callback and property declarations into <span class="hljs-title">MainWindow</span>:
+considers them solved and they remain open. Otherwise, the game waits briefly so the player can memorize
+the location of the icons, and then closes the curtains again.
+
+Change the contents of `memory.slint` to signal to the JavaScript code when the user clicks on a tile.
 
 ```slint
 {{#include ../../rust/src/main_game_logic_in_rust.rs:mainwindow_interface}}
 ```
 
-The last change to the `.slint` markup is to act when the <span class="hljs-title">MemoryTile</span> signals that it was clicked on.
+This change adds a way for the <span class="hljs-title">MainWindow</span> to call to the JavaScript code that it should
-We add the following handler in <span class="hljs-title">MainWindow</span>:
+check if a player has solved a pair of tiles. The Rust code needs an additional property to toggle to disable further
+tile interaction, to prevent the player from opening more tiles than allowed. No cheating allowed!
+
+The last change to the code is to act when the <span class="hljs-title">MemoryTile</span> signals that a player clicked it.
+
+Add the following handler in <span class="hljs-title">MainWindow</span>:
 
 ```slint
 {{#include ../../rust/src/main_game_logic_in_rust.rs:tile_click_logic}}
 ```
 
-On the JavaScript side, we can now add an handler to the `check_if_pair_solved` callback, that will check if
+On the JavaScript side, now add a handler to the `check_if_pair_solved` callback, that checks if a player opened two tiles. If they match, the code sets the `solved` property to true in the model. If they don't
-two tiles are opened. If they match, the `solved` property is set to true in the model. If they don't
+match, start a timer that closes the tiles after one second. While the timer is running, disable every tile so
-match, start a timer that will close them after one second. While the timer is running, we disable every tile so
+a player can't click anything during this time.
-one can't click anything during this time.
 
 Insert this code before the `mainWindow.run()` call:
 
@@ -35,5 +39,4 @@ Insert this code before the `mainWindow.run()` call:
 {{#include main_game_logic.js:game_logic}}
 ```
 
-These were the last changes and running the result gives us a window on the screen that allows us
+These were the last changes and running the code opens a window that allows a player to play the game by the rules.
-to play the game by the rules.

docs/tutorial/node/src/getting_started.md

@@ -1,48 +1,42 @@
 <!-- Copyright © SixtyFPS GmbH <info@slint.dev> ; SPDX-License-Identifier: MIT -->
+
 # Getting Started
 
-In this tutorial, we use JavaScript as the host programming language. We also support other programming languages like
+This tutorial uses JavaScript as the host programming language. Slint also supports other programming languages like
 [Rust](https://slint.dev/docs/rust/slint/) or [C++](https://slint.dev/docs/cpp/).
 
-You'll need a development environment with [Node.js 16](https://nodejs.org/download/release/v16.19.1/) and [npm](https://www.npmjs.com/) installed. More recent
+Slint has an application template you can use to create a project with dependencies already set up that follows recommended best practices.
-versions of NodeJS are currently not supported, for details check [Issue #961](https://github.com/slint-ui/slint/issues/961).
-Since Slint is implemented in the Rust programming language, you also need to install a Rust compiler (1.70 or newer). You can easily install a Rust compiler
-following the instruction from [the Rust website](https://www.rust-lang.org/learn/get-started).
-You will also need some additional platform-specific dependencies, see <https://github.com/slint-ui/slint/blob/master/docs/building.md#prerequisites>
 
-We're going to use `slint-ui` as `npm` dependency.
 
-In a new directory, we create a new `package.json` file.
+Clone the template with the following command:
 
-```json
+```sh
-{{#include package.json}}
+git clone https://github.com/slint-ui/slint-nodejs-template memory
+cd memory
 ```
 
-This should look familiar to people familiar with NodeJS. We see that this package.json
+Install dependencies with npm:
-references a `main.js`, which we will add later. We must then create, in the same directory,
-the `memory.slint` file. Let's just fill it with a hello world for now:
 
-```slint
+```sh
-{{#include memory.slint:main_window}}
+npm install
 ```
 
-What's still missing is the `main.js`:
+The `package.json` file references `src/main.js` as the entry point for the application and `src/main.js` references `memory.slint` as the UI file.
+
+Replace the contents of `src/main.js` with the following:
 
 ```js
 {{#include main_initial.js:main}}
 ```
 
-To recap, we now have a directory with a `package.json`, `memory.slint`, and `main.js`.
+Note that `slint.loadFile` resolves files from the process's current working directory, so from the `package.json` file's location.
 
-We can now compile and run the program:
+Replace the contents of `ui/appwindow.slint` with the following:
 
-```sh
+```slint
-npm install
+{{#include memory.slint:main_window}}
-npm start
 ```
 
-and a window will appear with the green "Hello World" greeting.
+Run the example with `npm start` and a window appears with the green "Hello World" greeting.
 
-![Screenshot of initial tutorial app showing Hello World](https://slint.dev/blog/memory-game-tutorial/getting-started.png "Hello World")
+![Screenshot of an initial tutorial app showing Hello World](https://slint.dev/blog/memory-game-tutorial/getting-started.png "Hello World")
-
-Feel free to use your favorite IDE for this purpose.

docs/tutorial/node/src/ideas_for_the_reader.md

@@ -1,12 +1,13 @@
 <!-- Copyright © SixtyFPS GmbH <info@slint.dev> ; SPDX-License-Identifier: MIT -->
+
 # Ideas For The Reader
 
-The game is visually a little bare. Here are some ideas how you could make further changes to enhance it:
+The game is visually bare. Here are some ideas on how you could make further changes to enhance it:
 
--   The tiles could have rounded corners, to look a little less sharp. The [border-radius](https://slint.dev/docs/slint/src/language/builtins/elements#rectangle)
+-   The tiles could have rounded corners, to look less sharp. Use the [border-radius](https://slint.dev/docs/slint/src/language/builtins/elements#rectangle)
-    property of _Rectangle_ can be used to achieve that.
+    property of _[Rectangle](https://slint.dev/docs/slint/src/language/builtins/elements#rectangle)_ to achieve that.
 
--   In real world memory games, the back of the tiles often have some common graphic. You could add an image with
+-   In real-world memory games, the back of the tiles often have some common graphic. You could add an image with
     the help of another _[Image](https://slint.dev/docs/slint/src/language/builtins/elements#image)_
     element. Note that you may have to use _Rectangle_'s _clip property_
     element around it to ensure that the image is clipped away when the curtain effect opens.

docs/tutorial/node/src/introduction.md

@@ -1,15 +1,16 @@
 <!-- Copyright © SixtyFPS GmbH <info@slint.dev> ; SPDX-License-Identifier: MIT -->
+
 # Introduction
 
-This tutorial will introduce you to the Slint UI framework in a playful way by implementing a little memory game. We're going to combine the `.slint` language for the graphics with the game rules implemented in JavaScript.
+This tutorial introduces you to the Slint UI framework in a playful way by implementing a memory game. It combines the `.slint` language for the graphics with the game rules implemented in Rust.
 
 The game consists of a grid of 16 rectangular tiles. Clicking on a tile uncovers an icon underneath.
-We know that there are 8 different icons in total, so each tile has a sibling somewhere in the grid with the
+There are 8 different icons in total, so each tile has a sibling somewhere in the grid with the
-same icon. The objective is to locate all icon pairs. You can uncover two tiles at the same time. If they
+same icon. The objective is to locate all icon pairs. The player can uncover two tiles at the same time. If they
-aren't the same, the icons will be obscured again.
+aren't the same, the game obscures the icons again.
-If you uncover two tiles with the same icon, then they remain visible - they're solved.
+If the player uncovers two tiles with the same icon, then they remain visible - they're solved.
 
-This is how the game looks like in action:
+This is how the game looks in action:
 
 <video autoplay loop muted playsinline src="https://slint.dev/blog/memory-game-tutorial/memory_clip.mp4"
-        class="img-fluid img-thumbnail rounded"></video>
+        class="img-fluid img-thumbnail rounded"></video>

docs/tutorial/node/src/main_game_logic.js

@@ -16,10 +16,10 @@ for (let i = tiles.length - 1; i > 0; i--) {
     [tiles[i], tiles[j]] = [tiles[j], tiles[i]];
 }
 
-// ANCHOR: game_logic
 let model = new slint.ArrayModel(tiles);
 mainWindow.memory_tiles = model;
 
+// ANCHOR: game_logic
 mainWindow.check_if_pair_solved = function () {
     let flipped_tiles = [];
     tiles.forEach((tile, index) => {
@@ -61,7 +61,5 @@ mainWindow.check_if_pair_solved = function () {
         }
     }
 };
-
-await mainWindow.run();
-
 // ANCHOR_END: game_logic
+await mainWindow.run();

docs/tutorial/node/src/main_initial.js

@@ -5,7 +5,7 @@
 // main.js
 import * as slint from "slint-ui";
 
-let ui = slint.loadFile("./memory.slint");
+let ui = slint.loadFile("./ui/appwindow.slint");
 let mainWindow = new ui.MainWindow();
 await mainWindow.run();
 

docs/tutorial/node/src/main_tiles_from_js.js

@@ -4,7 +4,7 @@
 // ANCHOR: main
 // main.js
 import * as slint from "slint-ui";
-let ui = slint.loadFile("./memory.slint");
+let ui = slint.loadFile("./ui/appwindow.slint");
 let mainWindow = new ui.MainWindow();
 
 let initial_tiles = mainWindow.memory_tiles;

docs/tutorial/node/src/memory.slint

@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: MIT
 
 // ANCHOR: main_window
-// memory.slint
+// appwindow.slint
 export component MainWindow inherits Window {
     Text {
         text: "hello world";

docs/tutorial/node/src/memory_tile.md

@@ -1,43 +1,54 @@
 <!-- Copyright © SixtyFPS GmbH <info@slint.dev> ; SPDX-License-Identifier: MIT -->
+
 # Memory Tile
 
-With the skeleton in place, let's look at the first element of the game, the memory tile. It will be the
+With the skeleton in place, this step looks at the first element of the game, the memory tile. It's the
-visual building block that consists of an underlying filled rectangle background, the icon image. Later we'll add a
+visual building block that consists of an underlying filled rectangle background, the icon image. Later you'll add a
-covering rectangle that acts as a curtain. The background rectangle is declared to be 64 logical pixels wide and tall,
+covering rectangle that acts as a curtain.
-and it's filled with a soothing tone of blue. Note how lengths in the `.slint` language have a unit, here
-the `px` suffix. That makes the code easier to read and the compiler can detect when your are accidentally
-mixing values with different units attached to them.
 
-We copy the following code into the `memory.slint` file:
+You declare the background rectangle as 64 logical pixels wide and tall
+and it's filled with a soothing tone of blue.
+
+Note how lengths in the `.slint` language have a unit, here
+the `px` suffix. That makes the code easier to read and the compiler can detect when you accidentally
+mix values with different units attached to them.
+
+Copy the following into the `ui/appwindow.slint` file:
 
 ```slint
 {{#include memory_tile.slint:main_window}}
 ```
 
-Note that we export the <span class="hljs-title">MainWindow</span> component. This is necessary so that we can later access it
+The code exports the <span class="hljs-title">MainWindow</span> component so that the business logic can access it later.
-from our business logic.
 
-Inside the <span class="hljs-built_in">Rectangle</span> we place an <span class="hljs-built_in">Image</span> element that
+Inside the <span class="hljs-built_in">Rectangle</span> place an <span class="hljs-built_in">Image</span> element that
-loads an icon with the <span class="hljs-built_in">@image-url()</span> macro. The path is relative to the folder in which
+loads an icon with the <span class="hljs-built_in">@image-url()</span> macro.
-the `memory.slint` is located. This icon and others we're going to use later need to be installed first. You can download a
+
-[Zip archive](https://slint.dev/blog/memory-game-tutorial/icons.zip) that we have prepared.
+The path is relative to the folder that contains `ui/appwindow.slint`. You need to install this icon and others you use later first. You can download a pre-prepared
+[Zip archive](https://slint.dev/blog/memory-game-tutorial/icons.zip) and extract it with the
+following two commands:
 
 If you are on Linux or macOS, download and extract it with the following two commands:
 
 ```sh
+cd ui
 curl -O https://slint.dev/blog/memory-game-tutorial/icons.zip
 unzip icons.zip
+cd ..
 ```
 
 If you are on Windows, use the following commands:
 
-```
+```sh
+cd ui
 powershell curl -Uri https://slint.dev/blog/memory-game-tutorial/icons.zip -Outfile icons.zip
 powershell Expand-Archive -Path icons.zip -DestinationPath .
+cd ..
 ```
 
-This should unpack an `icons` directory containing a bunch of icons.
+This unpacks an `icons` directory containing several icons.
 
-We running the program with `npm start` and it gives us a window on the screen that shows the icon of a bus on a blue background.
+Running the program with `npm start` now opens a window that shows the icon of a bus on a
+blue background.
 
 ![Screenshot of the first tile](https://slint.dev/blog/memory-game-tutorial/memory-tile.png "Memory Tile Screenshot")

docs/tutorial/node/src/polishing_the_tile.md

@@ -1,33 +1,42 @@
 <!-- Copyright © SixtyFPS GmbH <info@slint.dev> ; SPDX-License-Identifier: MIT -->
+
 # Polishing the Tile
 
-Next, let's add a curtain like cover that opens up when clicking. We achieve this by declaring two rectangles
+In this step, you add a curtain-like cover that opens when clicked. You do this by declaring two rectangles
-below the <span class="hljs-built_in">Image</span>, so that they are drawn afterwards and thus on top of the image.
+below the <span class="hljs-built_in">Image</span>, so that Slint draws them after the Image and thus on top of the image.
+
 The <span class="hljs-built_in">TouchArea</span> element declares a transparent rectangular region that allows
-reacting to user input such as a mouse click or tap. We use that to forward a callback to the <em>MainWindow</em>
+reacting to user input such as a mouse click or tap. The element forwards a callback to the <em>MainWindow</em> indicating that a user clicked the tile.
-that the tile was clicked on. In the <em>MainWindow</em> we react by flipping a custom <em>open_curtain</em> property.
-That in turn is used in property bindings for the animated width and x properties. Let's look at the two states a bit
-more in detail:
 
-| *open_curtain* value: | false | true |
+The <em>MainWindow</em> reacts by flipping a custom <em>open_curtain</em> property.
-| --- | --- | --- |
+Property bindings for the animated width and x properties also use the custom <em>open_curtain</em> property.
-| Left curtain rectangle | Fill the left half by setting the width *width* to half the parent's width | Width of zero makes the rectangle invisible |
-| Right curtain rectangle | Fill the right half by setting *x* and *width* to half of the parent's width | *width* of zero makes the rectangle invisible. *x* is moved to the right, to slide the curtain open when animated |
 
-In order to make our tile extensible, the hard-coded icon name is replaced with an *icon*
+The following table shows more detail on the two states:
-property that can be set from the outside when instantiating the element. For the final polish, we add a
+
-*solved* property that we use to animate the color to a shade of green when we've found a pair, later. We
+| _open_curtain_ value:   | false                                                                        | true                                                                                                          |
-replace the code inside the `memory.slint` file with the following:
+| ----------------------- | ---------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------- |
+| Left curtain rectangle  | Fill the left half by setting the width _width_ to half the parent's width   | Width of zero makes the rectangle invisible                                                                   |
+| Right curtain rectangle | Fill the right half by setting _x_ and _width_ to half of the parent's width | _width_ of zero makes the rectangle invisible. _x_ moves to the right, sliding the curtain open when animated |
+
+To make the tile extensible, replace the hard-coded icon name with an _icon_
+property that can be set when instantiating the element.
+
+For the final polish, add a
+_solved_ property used to animate the color to a shade of green when a player finds a pair.
+
+Replace the code in `ui/appwindow.slint` with the following:
 
 ```slint
 {{#include ../../rust/src/main_polishing_the_tile.rs:tile}}
 ```
 
-Note the use of `root` and `self` in the code. `root` refers to the outermost
+The code uses `root` and `self`. `root` refers to the outermost
-element in the component, that's the <span class="hljs-title">MemoryTile</span> in this case. `self` refers
+element in the component, the <span class="hljs-title">MemoryTile</span> in this case. `self` refers
 to the current element.
 
-Running this gives us a window on the screen with a rectangle that opens up to show us the bus icon, when clicking on
+The code exports the <span class="hljs-title">MainWindow</span> component. This is necessary so that you can later access it
-it. Subsequent clicks will close and open the curtain again.
+from application business logic.
+
+Running the code opens a window with a rectangle that opens up to show the bus icon when clicked. Subsequent clicks close and open the curtain again.
 
 <video autoplay loop muted playsinline src="https://slint.dev/blog/memory-game-tutorial/polishing-the-tile.mp4"></video>