Memory Tile

With the skeleton in place, let's look at the first element of the game, the memory tile. It will be the visual building block that consists of an underlying filled rectangle background, the icon image. Later we'll add a covering rectangle that acts as a curtain. The background rectangle is declared to be 64 logical pixels wide and tall, and it is 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 inside of the slint! macro:

MemoryTile := Rectangle {
    width: 64px;
    height: 64px;
    background: #3960D5;

    Image {
        source: @image-url("icons/bus.png");
        width: parent.width;
        height: parent.height;
    }
}

MainWindow := Window {
    MemoryTile {}
}

Inside the Rectangle we place an Image element that loads an icon with the @image-url() macro. When using the slint! macro, the path is relative to the folder in which the Cargo.toml is located. When using .slint files, it is relative to the folder of the .slint file containing it. This icon and others we're going to use later need to be installed first. You can download a Zip archive that we have prepared and extract it with the following two commands:

curl -O https://slint-ui.com/blog/memory-game-tutorial/icons.zip
unzip icons.zip

This should unpack an icons directory containing a bunch of icons.

Running the program with cargo run gives us a window on the screen that shows the icon of a bus on a blue background.