lvgl_cpp/lv_drivers/gtkdrv

Add GTK under Linux in Eclipse

Install GDK

sudo apt-get install libgtk-3-dev
sudo apt-get install libglib2.0-dev

Add GTK include paths and libraries

In "Project properties > C/C++ Build > Settings" set the followings:

• "Cross GCC Compiler > Command line pattern"

  • Add ${gtk+-cflags} to the end (add a space between the last command and this)

• "Cross GCC Compiler > Includes"

  • /usr/include/glib-2.0
  • /usr/include/gtk-3.0
  • /usr/include/pango-1.0
  • /usr/include/cairo
  • /usr/include/gdk-pixbuf-2.0
  • /usr/include/atk-1.0

• "Cross GCC Linker > Command line pattern"

  • Add ${gtk+-libs} to the end (add a space between the last command and this)

• "Cross GCC Linker > Libraries"

  • Add pthread

• In "C/C++ Build > Build variables"

  • Configuration: [All Configuration]

  • Add

    • Variable name: gtk+-cflags
      • Type: String
      • Value: pkg-config --cflags gtk+-3.0
    • Variable name: gtk+-libs
      • Type: String
      • Value: pkg-config --libs gtk+-3.0

Init GDK in LVGL

1. In main.c #include "lv_drivers/gtkdrv/gtkdrv.h"
2. Enable the GTK driver in lv_drv_conf.h with USE_GTK 1
3. After lv_init() call gdkdrv_init();
4. Add a display:

  static lv_disp_buf_t disp_buf1;
  static lv_color_t buf1_1[LV_HOR_RES_MAX * LV_VER_RES_MAX];
  lv_disp_buf_init(&disp_buf1, buf1_1, NULL, LV_HOR_RES_MAX * LV_VER_RES_MAX);

  /*Create a display*/
  lv_disp_drv_t disp_drv;
  lv_disp_drv_init(&disp_drv);
  disp_drv.buffer = &disp_buf1;
  disp_drv.flush_cb = gtkdrv_flush_cb;

5. Add mouse:

  lv_indev_drv_t indev_drv_mouse;
  lv_indev_drv_init(&indev_drv_mouse);
  indev_drv_mouse.type = LV_INDEV_TYPE_POINTER;

6. Add keyboard:

  lv_indev_drv_t indev_drv_kb;
  lv_indev_drv_init(&indev_drv_kb);
  indev_drv_kb.type = LV_INDEV_TYPE_KEYPAD;
  indev_drv_kb.read_cb = lv_keyboard_read_cb;
  lv_indev_drv_register(&indev_drv_kb);

7. Configure tick in lv_conf.h

#define LV_TICK_CUSTOM     1
#if LV_TICK_CUSTOM == 1
#define LV_TICK_CUSTOM_INCLUDE  "lv_drivers/gtkdrv/gtkdrv.h"       /*Header for the sys time function*/
#define LV_TICK_CUSTOM_SYS_TIME_EXPR (gtkdrv_tick_get())     /*Expression evaluating to current systime in ms*/
#endif   /*LV_TICK_CUSTOM*/

8. Be sure LV_COLOR_DEPTH is 32 in lv_conf.h

Run in a window

Build and Run to "normally" run the UI in a window

Run in browser

With the help of Broadway the UI can be easily shown via a browser.

1. Open Terminal and start Broadway with broadwayd :5. Leave the terminal running.
2. Navigate to where eclipse created the binary executable (my_project/Debug) and open a terminal in that folder. In this terminal run GDK_BACKEND=broadway BROADWAY_DISPLAY=:5 ./my_executable (replace my_executable wih name of your executable)
3. Open a web browser and go to http://localhost:8085/