tiny_lvgl_gui

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Tiny C++ wrapper around littlevgl library - only label and button, for the workshop.

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# Tiny C++ wrapper around littlevgl library

Supports Label, Button and QR code, for the workshop.

Example:

```cpp
#include <mbed.h>
#include <gui.h>

GUI gui;     // our GUI instance
Label lbl;   // label in the global scope, we will change text from the button callback

// button callback, default lvgl type
static lv_res_t callback(lv_obj_t * btn){
  Button button(btn); // can be converted to C++ class
  uint id = button.id();
  id++;
  button.id(id);
  char msg[40];
  sprintf(msg, "Button clicked %d times!", id);
  lbl.text(msg);
  return LV_RES_OK;
}

int main() {

gui.init();

// Create a QR code to display a message
  qr = QR("Scan me!");
  qr.size(300);
  qr.position(0, 50);
  qr.align(ALIGN_CENTER);

// Create a label to log clicks
  lbl = Label("Hello display!");
  lbl.size(gui.width(), 100); // full width
  lbl.position(0, 400);
  lbl.alignText(ALIGN_TEXT_CENTER);

// Create a button
  Button btn(callback, "Click me!");
  btn.id(0); // we will use id of a button as a counter.
  btn.size(300, 100);
  btn.position(0, 600);
  btn.align(ALIGN_CENTER);

while(1) {
    gui.update();
  }
}
```

tiny_lvgl_gui

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