lvgl-小项目源码-通过按钮切换窗口的设计

# Wayland display and input driver Wayland display and input driver, with support for keyboard, pointer (i.e. mouse) and touchscreen. Keyboard support is based on libxkbcommon. Following shell are supported: * wl_shell (deprecated) * xdg_shell > xdg_shell requires an extra build step; see section _Generate protocols_ below. Basic client-side window decorations (simple title bar, minimize and close buttons) are supported, while integration with desktop environments is not. ## Install headers and libraries ### Ubuntu ``` sudo apt-get install libwayland-dev libxkbcommon-dev libwayland-bin wayland-protocols ``` ### Fedora ``` sudo dnf install wayland-devel libxkbcommon-devel wayland-utils wayland-protocols-devel ``` ## Generate protocols Support for non-basic shells (i.e. other than _wl_shell_) requires additional source files to be generated before the first build of the project. To do so, navigate to the _wayland_ folder (the one which includes this file) and issue the following commands: ``` cmake . make ``` ## Build configuration under Eclipse In "Project properties > C/C++ Build > Settings" set the followings: - "Cross GCC Compiler > Command line pattern" - Add ` ${wayland-cflags}` and ` ${xkbcommon-cflags}` to the end (add a space between the last command and this) - "Cross GCC Linker > Command line pattern" - Add ` ${wayland-libs}` and ` ${xkbcommon-libs}` to the end (add a space between the last command and this) - In "C/C++ Build > Build variables" - Configuration: [All Configuration] - Add - Variable name: `wayland-cflags` - Type: `String` - Value: `pkg-config --cflags wayland-client` - Variable name: `wayland-libs` - Type: `String` - Value: `pkg-config --libs wayland-client` - Variable name: `xkbcommon-cflags` - Type: `String` - Value: `pkg-config --cflags xkbcommon` - Variable name: `xkbcommon-libs` - Type: `String` - Value: `pkg-config --libs xkbcommon` ## Init Wayland in LVGL 1. In `main.c` `#incude "lv_drivers/wayland/wayland.h"` 2. Enable the Wayland driver in `lv_drv_conf.h` with `USE_WAYLAND 1` and configure its features below, enabling at least support for one shell. 3. `LV_COLOR_DEPTH` should be set either to `32` or `16` in `lv_conf.h`; support for `8` and `1` depends on target platform. 4. After `lv_init()` call `lv_wayland_init()`. 5. Add a display (or more than one) using `lv_wayland_create_window()`, possibly with a close callback to track the status of each display: ```c #define H_RES (800) #define V_RES (480) /* Create a display */ lv_disp_t * disp = lv_wayland_create_window(H_RES, V_RES, "Window Title", close_cb); ``` As part of the above call, the Wayland driver will register four input devices for each display: - a KEYPAD connected to Wayland keyboard events - a POINTER connected to Wayland touch events - a POINTER connected to Wayland pointer events - a ENCODER connected to Wayland pointer axis events Handles for input devices of each display can be get using respectively `lv_wayland_get_indev_keyboard()`, `lv_wayland_get_indev_touchscreen()`, `lv_wayland_get_indev_pointer()` and `lv_wayland_get_indev_pointeraxis()`, using `disp` as argument. 5. After `lv_deinit()` (if used), or in any case during de-initialization, call `lv_wayland_deinit()`. ### Fullscreen mode In order to set one window as fullscreen or restore it as a normal one, call the `lv_wayland_window_set_fullscreen()` function respectively with `true` or `false` as `fullscreen` argument. ### Disable window client-side decoration at runtime Even when client-side decorations are enabled at compile time, they can be disabled at runtime setting the `LV_WAYLAND_DISABLE_WINDOWDECORATION` environment variable to `1`. ### Event-driven timer handler Set `LV_WAYLAND_TIMER_HANDLER` in `lv_drv_conf.h` and call `lv_wayland_timer_handler()` in your timer loop (in place of `lv_timer_handler()`). You can now sleep/wait until the next timer/event is ready, e.g.: ``` /* [After initialization and display creation] */ #include <limits.h> #include <errno.h> #include <poll.h> struct pollfd pfd; uint32_t time_till_next; int sleep; pfd.fd = lv_wayland_get_fd(); pfd.events = POLLIN; while (1) { /* Handle any Wayland/LVGL timers/events */ time_till_next = lv_wayland_timer_handler(); /* Run until the last window closes */ if (!lv_wayland_window_is_open(NULL)) { break; } /* Wait for something interesting to happen */ if (time_till_next == LV_NO_TIMER_READY) { sleep = -1; } else if (time_till_next > INT_MAX) { sleep = INT_MAX; } else { sleep = time_till_next; } while ((poll(&pfd, 1, sleep) < 0) && (errno == EINTR)); } ```