Module lvgl::input_device

source ·
Expand description

Input driver logic and handling

LVGL supports 4 types of input device. The current status as to support in this library is:

  • Pointer: Fully supported
  • Keyboard: Unsupported
  • Button: Unsupported
  • Encoder: Unsupported

The general order of operations when creating an input device is initializing an instance of the desired device, setting a callback function (and any other parameters and functions, depending on type), and registering the device to LVGL. Inputs are sent to LVGL via a buffer. An example making use of the embedded_graphics crate could be:

ⓘ
use lvgl::input_device::InputDriver;
use lvgl::input_device::pointer::{Pointer, PointerInputData};
use embedded_graphics::prelude::*;

fn main() {
    // IMPORTANT: Initialize a display driver first!
    // ...
    // Define the initial state of your input
    let mut latest_touch_status = PointerInputData::Touch(Point::new(0, 0)).released().once();
    // Register a new input device that's capable of reading the current state of the input
    let mut touch_screen = Pointer::new(|| latest_touch_status, &display);
    lvgl::indev_drv_register(&mut touch_screen).unwrap();
    // ...
}

For a full example, see the button_click example.

Modules

Enums

  • BufferStatus
    Boolean buffering states for an input device driver.
  • Data
    Generic data which can be associated with an input device driver. Varies based on the concrete type of the input device driver
  • InputState
    Boolean states for an input.

Traits