- fix: build on Windows (MinGW environment) [`4538`](https://github.com/lvgl/lvgl/pull/4538)
- fix(docs): dropdown: fix function name in description of static options [`4535`](https://github.com/lvgl/lvgl/pull/4535)
- fix: do not copy invalid areas if not double buffered mode [`4526`](https://github.com/lvgl/lvgl/pull/4526)
- fix(sdl): add missing parameter in lv_draw_sdl_composite_texture_obtain [`4490`](https://github.com/lvgl/lvgl/pull/4490)
- fix(dropdown): position to the selected item in lv_dropdown_set_selected [`f174589`](https://github.com/lvgl/lvgl/commit/f174589240b099a349e54ba09aa9b39c2b347341)
- fix(vglite): be sure end_angle > start_angle in arc drawing [`01cd1fe`](https://github.com/lvgl/lvgl/commit/01cd1fed9db974aa616a6289a29171b7a971cd89)
- fix(btnmatrix): fix tapping just outside a button in a buttonmatrix [`8063fac`](https://github.com/lvgl/lvgl/commit/8063fac793b0a09add1e57c1115b734659274e6f)
### Docs
- docs(calendar): update according to v8.2 changes [`a296456`](https://github.com/lvgl/lvgl/commit/a296456591f6ff0e3b3ae6cdcdd9ec5b1711c357)
- docs(simulator): remove SDL support from the Visual Studio project [`bcebafe`](https://github.com/lvgl/lvgl/commit/bcebafe4fb72e336b7dedca89c07e334427eef8d)
### CI and tests
- ci: update screenshot compare from v9 to automatically create missing reference images [`fd21ed0`](https://github.com/lvgl/lvgl/commit/fd21ed0eb82bacb1e482180ab0aaed6a667f000d)
- ci(dropdown): fix test [`5fc488a`](https://github.com/lvgl/lvgl/commit/5fc488a088639dbfb5eb44f65b05e13b6ba881bf)
### Others
- chore(cmsis-pack): create cmsis-pack for v8.3.10 [`4572`](https://github.com/lvgl/lvgl/pull/4572)
- Update screen object opacity function documentation [`4505`](https://github.com/lvgl/lvgl/pull/4505)
- demo(sress): fix issues when the stress test is opened/clsoed multiple times [`1c5df6c`](https://github.com/lvgl/lvgl/commit/1c5df6c665b0d5f6f346d45b13109ff1f6ea78a6)
- fix(indev): fix warnings when loggin coordinates is enabled [`645006e`](https://github.com/lvgl/lvgl/commit/645006e35195cab3354f34a1a8cbc8c5ed0fdfad)
- fix: use const lv_img_dsc_t * dsc function parameter in lv_img_buf.h/ [`4f102d7`](https://github.com/lvgl/lvgl/commit/4f102d7b6b2e9f9fa68ab7b976d93762107549a4)
- fix(imgbtn): support LV_OBJ_FLAG_CHECKABLE [`385d999`](https://github.com/lvgl/lvgl/commit/385d999a4a8164fcde6ae05f6a5daa5d5c209dd3)
### Docs
- docs(disp): metined that rotation rotates the touch coordinates too [`810852b`](https://github.com/lvgl/lvgl/commit/810852b41be5df66fd7b80f8af69f8b579d142ea)
### Others
- demos: add lv_demo_..._close() functions for each demo [`91038a9`](https://github.com/lvgl/lvgl/commit/91038a99e82a2522f693c7cdc77e9e7a672ee9ed)
## [v8.3.8](https://github.com/lvgl/lvgl/compare/v8.3.8...v8.3.7) 5 July 2023
### New Features
- feat(rt-thread): make the rt-thread env recursively glob the UI files [`8b83fe7`](https://github.com/lvgl/lvgl/commit/8b83fe7ea53a597cdbae8204d0aa9be8ad3d2b89)
### Performance
- perf(pxp, vglite): improve performance and add more features [`4222`](https://github.com/lvgl/lvgl/pull/4222)
### Fixes
- fix(stm32): static function prototypes moved from .h to .c [`4276`](https://github.com/lvgl/lvgl/pull/4276)
- fix(png): fix decode image size and some warnings [`4248`](https://github.com/lvgl/lvgl/pull/4248)
- fix(bidi): add more Hebrew checks to RTL characters set (#4171) [`4239`](https://github.com/lvgl/lvgl/pull/4239)
- fix(img): fix getting the image type on big endian systems [`4215`](https://github.com/lvgl/lvgl/pull/4215)
- fix(sdl): destroy texture after use if not stored in cache [`4173`](https://github.com/lvgl/lvgl/pull/4173)
- fix(tabview): remove the animation if the tab is selected by clicking the button on the header [`3de61c7`](https://github.com/lvgl/lvgl/commit/3de61c76af0aed1665e9d61e47b4dd50b9e8bdf1)
- fix(btnmatrix): fix array out of bounds addressing with groups and no buttons [`edd5ad2`](https://github.com/lvgl/lvgl/commit/edd5ad28ad74d1025db0b442cfa390d8c01ae006)
- fix(btnmatrix): fix using > 7 as button width [`75e6ef4`](https://github.com/lvgl/lvgl/commit/75e6ef4e1d66a85d68160b97ef931b0717e77212)
- fix(draw): typo with LV_COLOR_DEPTH 8 [`45b13c3`](https://github.com/lvgl/lvgl/commit/45b13c378f6fc1728ddf1547c25daa61d62c9f76)
- fix(disp): fix memory leak lv_scr_load_anim with auto_del and time=0 [`1caafc5`](https://github.com/lvgl/lvgl/commit/1caafc55dde46e1b7e3d17d8c5349fbf7cccba9f)
- example(tabview): fix tabview disable scrollig example [`9491c3f`](https://github.com/lvgl/lvgl/commit/9491c3ff6d2f8e56b13d8fb493d4b3ee98ef1a4b)
### Docs
- docs: mention incompatibility between software rotation and `direct_mode` or `full_refresh` [`4308`](https://github.com/lvgl/lvgl/pull/4308)
- docs(faq): don't say 24 bit is support as LVGL can't render in RGB888 directly [`227ac02`](https://github.com/lvgl/lvgl/commit/227ac023419eeb253892b1c36113059f12b1f9f2)
### CI and tests
### Others
- chore(cmsis-pack): update cmsis-pack for v8.3.8 [`4340`](https://github.com/lvgl/lvgl/pull/4340)
## [v8.3.7](https://github.com/lvgl/lvgl/compare/v8.3.7...v8.3.6) 3 May 2023
### New Features
- feat(btnmatrix): review ctrl map and allow width values to be max 15 [`a150b15`](https://github.com/lvgl/lvgl/commit/a150b15e45a922eb5497fe5a31a480e1cd689246)
### Fixes
- fix (spinbox): doubling characters entered from the keyboard [`4190`](https://github.com/lvgl/lvgl/pull/4190)
- fix(group): fix default_group becomes wild pointer when deleted [`4076`](https://github.com/lvgl/lvgl/pull/4076)
- fix(fs_posix): allow creating new file and set permission. [`3976`](https://github.com/lvgl/lvgl/pull/3976)
- fix(img): support negative angles [`3846`](https://github.com/lvgl/lvgl/pull/3846)
- fix(gif): synchronize with master [`4003`](https://github.com/lvgl/lvgl/pull/4003)
- fix(gpu): fix STM GPU drivers for some variants [`4004`](https://github.com/lvgl/lvgl/pull/4004)
- fix(img): possible divide by 0 exception (lvgl#3988) [`3990`](https://github.com/lvgl/lvgl/pull/3990)
- fix(arc): fix knob area invalidation [`d0e19eb`](https://github.com/lvgl/lvgl/commit/d0e19eb2d38ba8a500399b0496d7a8363be4003e)
- fix(slider): consider animations on pressing [`0b7777f`](https://github.com/lvgl/lvgl/commit/0b7777f27a7932efe3d594be426e1beb59d80ae3)
- fix(bar): delete running animations when a new value is set without animation [`aa31380`](https://github.com/lvgl/lvgl/commit/aa313806d0ebde475fc2bc360a15172cc1b658a7)
- docs: use a fixed commit of lv_web_emscripten [`501230e`](https://github.com/lvgl/lvgl/commit/501230e0fc95936199b3187d350873c3bb4a94e4)
### Examples
### Docs
- docs(arduino): add note to not use lv_examles library [`2f294aa`](https://github.com/lvgl/lvgl/commit/2f294aa76c8fece98a4fa72304bc6f267ed2a228)
- docs: use a fixed commit of lv_web_emscripten [`501230e`](https://github.com/lvgl/lvgl/commit/501230e0fc95936199b3187d350873c3bb4a94e4)
### CI and tests
### Others
- chore(cmsis-pack): update cmsis-pack for v8.3.6 [`4108`](https://github.com/lvgl/lvgl/pull/4108)
- chore: update the version numbers to v8.3.5-dev [`77670fb`](https://github.com/lvgl/lvgl/commit/77670fb1a55e0f2012ff7a057e535830e7253e22)
- fix(monkey): remove executable permissions from source files [`3971`](https://github.com/lvgl/lvgl/pull/3971)
- fix(ci): set Ubuntu version for MicroPython test [`3865`](https://github.com/lvgl/lvgl/pull/3865)
- fix(Kconfig): fix wrong type of LV_FS_STDIO_CACHE_SIZE (v8.3) [`3906`](https://github.com/lvgl/lvgl/pull/3906)
- docs(indev): fix the name of long_press_repeat_time (was long_press_rep_time) [`34c545e`](https://github.com/lvgl/lvgl/commit/34c545ef19dc97c8952a412e533a4cd3924b9fbc)
- fix(roller): consider the recolor setting of the label [`39f4247`](https://github.com/lvgl/lvgl/commit/39f424767fa57376c4cb08cf22951fd56d854fd6)
### Examples
### Docs
- docs(indev): fix the name of long_press_repeat_time (was long_press_rep_time) [`34c545e`](https://github.com/lvgl/lvgl/commit/34c545ef19dc97c8952a412e533a4cd3924b9fbc)
### CI and tests
- ci(esp): fix push to the component registry on tag [`e529230`](https://github.com/lvgl/lvgl/commit/e529230f4bb97b4506c430aac96d5ddaef685dc4)
### Others
- chore(cmsis-pack): update cmsis-pack for v8.3.5 [`3972`](https://github.com/lvgl/lvgl/pull/3972)
- chore: add an option to "LV_TICK_CUSTOM" [`3879`](https://github.com/lvgl/lvgl/pull/3879)
- bump version numbers to v8.3.5-dev [`47c8f8f`](https://github.com/lvgl/lvgl/commit/47c8f8f9822f4c0c0ffbe2f12b380bddefcec475)
## [v8.3.4](https://github.com/lvgl/lvgl/compare/v8.3.4...v8.3.3) 15 December 2022
### New Features
- feat(keyboard): ported arabic keyboard from release 7.10.0 [`3728`](https://github.com/lvgl/lvgl/pull/3728)
- feat(table): scroll to the selected cell with key navigation [`39d03a8`](https://github.com/lvgl/lvgl/commit/39d03a80f45847a1977cfe9cc6a509b1613d0aca)
- fix(draw): SDL2 gradient support #3848 [`3856`](https://github.com/lvgl/lvgl/pull/3856)
- fix(esp.cmake): add demos and examples [`3784`](https://github.com/lvgl/lvgl/pull/3784)
- fix(indev): fix scrolling on transformed obejcts [`84cf05d`](https://github.com/lvgl/lvgl/commit/84cf05d8b23b31e000db757a278545e58fcbcbe8)
- fix(style): add the missing support for pct pivot in tranasform style properties [`c8e584f`](https://github.com/lvgl/lvgl/commit/c8e584f879a1e1427e7a8f5ff496af39f17df41d)
- fix(flex): be sure obj->w_layout and h_layout can't be set at the same time [`c4c4007`](https://github.com/lvgl/lvgl/commit/c4c400716e80a279e7b3d43b8992915fe94441eb)
- fix(chart): fix very dense bar charts [`bb2c2ac`](https://github.com/lvgl/lvgl/commit/bb2c2ac34ac943978513c7ed51885078979b1c10)
- fix(draw): handle LV_COLOR_DEPTH == 1 too in lv_draw_sw_transform [`bd11ad8`](https://github.com/lvgl/lvgl/commit/bd11ad8542eac9ff51420e5afb80f7e6fcf36a5c)
- fix(draw): fix text color with sub pixel rendering and BGR order [`e050f5c`](https://github.com/lvgl/lvgl/commit/e050f5ca156f79d752894f38f0a437c946205cb4)
- fix(meter): fix setting part_draw_dsc.id in needle img drawing [`716e5e2`](https://github.com/lvgl/lvgl/commit/716e5e2c8bd2a22e7d56e8d7ca33054a11a1f4ed)
- fix(gridnav): fix stucking in pressed state with encoder [`ad56dfa`](https://github.com/lvgl/lvgl/commit/ad56dfaf7046a9bb8c05e877a8c8852cd14a59af)
- fix(darw): add back the disappeared antialising=0 support [`2c17b28`](https://github.com/lvgl/lvgl/commit/2c17b28ac476c95a4153ab6cabb77b1c7208bb74)
- fix(msg): fix typos in API by adding wrappers [`41fa416`](https://github.com/lvgl/lvgl/commit/41fa41613455260ccdeb87ecb890ce026ff0a435)
- fix(style): remove the reduntant define of LV_GRADIENT_MAX_STOPS [`903e94b`](https://github.com/lvgl/lvgl/commit/903e94b716ca1b32cdb51de11df679953699e53b)
- demo(benchmark): fix lv_label_set_text_fmt format strings [`ae38258`](https://github.com/lvgl/lvgl/commit/ae3825871e31cd42cad2f310bdfc605150670511)
- fix(canvas): fix clipéping on transformation [`b884aba`](https://github.com/lvgl/lvgl/commit/b884abae26f3824b27783a85d18ed51e550347c1)
- fix(draw): allow drawing outline with LV_DRAW_COMPLEX == 0 too [`ece3495`](https://github.com/lvgl/lvgl/commit/ece34950040e218fc73605a4e88f1060c2a274f8)
- fix(colorwheel): fix updating color when using lv_colorwheel_set_hsv [`d59bba1`](https://github.com/lvgl/lvgl/commit/d59bba12db115afb4b6aa53eed2625221dfff2fd)
- fix(slider): find the nearest value on click instead of floor [`dfd14fa`](https://github.com/lvgl/lvgl/commit/dfd14fa778aef25d0db61748a58aa9989ce5e2c8)
- fix(draw): fix border drawing with thick borders [`d5b2a9b`](https://github.com/lvgl/lvgl/commit/d5b2a9b2562cbfa327bf0ec03c11d28576037a14)
- fix(group): be sure obj is removed from its current group in lv_group_add_obj [`5156ee0`](https://github.com/lvgl/lvgl/commit/5156ee058d5de674a00ffd84d15d460de7f0e53b)
- fix(style): add missing invalidation in lv_obj_remove_local_style_prop [`a0515ba`](https://github.com/lvgl/lvgl/commit/a0515ba30dd74b8b22a6709d334eb03782ee1a4d)
### Docs
- docs(draw) remove reference to old lv_fs_add_drv function [`3564`](https://github.com/lvgl/lvgl/pull/3564)
- docs(disp): LV_COLOR_SCREEN_TRANSP remove dependency on LV_COLOR_DEPTH_32 as transparency is supported across all color depths [`3556`](https://github.com/lvgl/lvgl/pull/3556)
### CI and tests
- ci: protect test.c with #if LV_BUILD_TEST [`be485d7`](https://github.com/lvgl/lvgl/commit/be485d7605136d2a5d6a633c7cb5b7c525cae7ee)
### Others
- chore(rt-thread) backport fixes from v9 [`3604`](https://github.com/lvgl/lvgl/pull/3604)
@ -52,9 +52,14 @@ In the INO file you can see how to register a display and a touchpad for LVGL an
Note that, there is no dedicated INO file for every example. Instead, you can load an example by calling an `lv_example_...` function. For example `lv_example_btn_1()`.
**IMPORTANT**
**IMPORTANT NOTE 1**
Due to some the limitations of Arduino's build system you need to copy `lvgl/examples` to `lvgl/src/examples`. Similarly for the demos `lvgl/demos` to `lvgl/src/demos`.
**IMPORTANT NOTE 2**
Note that the `lv_examples` library is for LVGL v7 and you shouldn't install it for this version (since LVGL v8)
as the examples and demos are now part of the main LVGL library.
## Debugging and logging
LVGL can display debug information in case of trouble.
NXP has integrated LVGL into the MCUXpresso SDK packages for several of their general purpose and crossover
microcontrollers, allowing easy evaluation and migration into your product design.
NXP has integrated LVGL into the MCUXpresso SDK packages for general purpose and crossover microcontrollers, allowing
easy evaluation and migration into your product design.
[Download an SDK for a supported board](https://www.nxp.com/design/software/embedded-software/littlevgl-open-source-graphics-library:LITTLEVGL-OPEN-SOURCE-GRAPHICS-LIBRARY?&tid=vanLITTLEVGL-OPEN-SOURCE-GRAPHICS-LIBRARY)
today and get started with your next GUI application.
@ -10,42 +10,40 @@ with PXP/VGLite support if the modules are present), no additional integration w
## HW acceleration for NXP iMX RT platforms
Depending on the RT platform used, the acceleration can be done by NXP PXP (PiXel Pipeline) and/or the Verisilicon GPU
through an API named VGLite. There is a single NXP draw context that covers both GPUs allowing to have enabled either
one or even both at the same time. While enableing both 2D accelerators, the VGLite can be used to accelerate widget
drawing while the PXP accelerated blit and fill operations.
through an API named VGLite. Each accelerator has its own context that allows them to be used individually as well
simultaneously (in LVGL multithreading mode).
Supported draw callbacks are available in "src/draw/nxp/lv_gpu_nxp.c":
### PXP accelerator
Several drawing features in LVGL can be offloaded to the PXP engine. The CPU is available for other operations while the
PXP is running. RTOS is required to block the LVGL drawing thread and switch to another task or suspend the CPU for
power savings.
Supported draw callbacks are available in "src/draw/nxp/pxp/lv_draw_pxp.c":
The [HMI-Board](https://bit.ly/3I9nfUo) development board SDK now comes with LVGL integration for quick evaluation. Simply download the [SDK](https://github.com/RT-Thread-Studio/sdk-bsp-ra6m3-hmi-board/tree/main/projects/hmi-board-lvgl) for the supported motherboard and you’ll be on your way to creating your next GUI application in no time. For more information, check out the [Software design description](https://github.com/RT-Thread-Studio/sdk-bsp-ra6m3-hmi-board/blob/main/projects/hmi-board-lvgl/README.md).
## Creating new project with LVGL
It is recommended to start your project by downloading the HMI-Board SDK example project. It comes fully equipped with LVGL and dave-2d support (if the modules are present), so you won’t need to do any additional integration work.
## HW acceleration for Renesas RA6M3 platforms
For RA6M3 platforms, hardware acceleration can be achieved using the dave-2d GPU, depending on the platform used. Each accelerator has its own context, allowing them to be used individually or simultaneously in LVGL’s multithreading mode.
### Dave-2d accelerator
LVGL can offload several drawing features to the dave-2d engine, freeing up the CPU for other operations while dave-2d runs. An RTOS is required to block the LVGL drawing thread and switch to another task or suspend the CPU for power savings. Supported draw callbacks can be found in “src/draw/renesas/lv_gpu_d2_ra6m3.c”.
LVGL can offload several drawing features to the dave-2d engine, freeing up the CPU for other operations while dave-2d runs. An RTOS is required to block the LVGL drawing thread and switch to another task or suspend the CPU for power savings. Supported draw callbacks can be found in “src/draw/renesas/lv_gpu_d2_ra6m3.c”.
/*A static or global variable to store the buffers*/
static lv_color_t buf_1[COLOR_BUFFER];
```
- After initializing your peripherals (such as SPI, GPIOs, and LCD) in the `lv_port_disp_init()` function, you can initialize LVGL using [`lv_init()`.](https://docs.lvgl.io/master/API/core/lv_obj.html#_CPPv47lv_initv) Next, register the frame buffers using `lv_disp_draw_buf_init()` and create a new display driver using `lv_disp_drv_init()`.
```c
/*Initialize `disp_buf` with the buffer(s). With only one buffer use NULL instead buf_2 */
/*Used to copy the buffer's content to the display*/
disp_drv.flush_cb = disp_flush;
/* Initialize GPU module */
lv_port_gpu_hw_init();
/*Finally register the driver*/
lv_disp_drv_register(&disp_drv);
```
* To run LVGL, you’ll need to create a thread. You can find examples of how to do this using RT-Thread in the `env_support/rt-thread/lv_rt_thread_port.c` file.
- The last step is to create a function to output the frame buffer to your LCD. The specifics of this function will depend on the features of your MCU. Here’s an example for a typical MCU interface: `my_flush_cb`.
LVGL has a [File system](https://docs.lvgl.io/master/overview/file-system.html) module to provide an abstraction layer for various file system drivers.
You still need to provide the drivers and libraries, this extension provides only the bridge between FATFS, LittleFS, STDIO, POSIX, WIN32 and LVGL.
- STDIO (Linux and Windows using C standard function .e.g fopen, fread)
- POSIX (Linux and Windows using POSIX function .e.g open, read)
- WIN32 (Windows using Win32 API function .e.g CreateFileA, ReadFile)
## Built in wrappers
You still need to provide the drivers and libraries, this extension provides only the bridge between FATFS, STDIO, POSIX, WIN32 and LVGL.
### FATFS
Bridge for [FatFS](http://elm-chan.org/fsw/ff/00index_e.html). FatFS itself is not part of LVGL, but can be added and initialized externally.
### LittleFS
Though `lv_fs_littlefs` uses [LittleFS]((https://github.com/littlefs-project/littlefs)) API, the LittleFS library needs other external libraries that handle the mounting of partitions and low-level accesses, according to the given architecture. The functions for the latter are given to the lfs_t structure as pointers by an external low-level library.
There's a convenience function called `lv_fs_littlefs_set_driver(LV_FS_LITTLEFS_LETTER, my_lfs)`, specific to `lv_fs_littlefs`, to attach a `lfs_t` object's pointer to a registered driver-letter. See its comments for more info.
[esp_littlefs](https://components.espressif.com/components/joltwallet/littlefs) is a wrapper for LittleFS to be used in Espressif ESP-devices. It handles the mounting and has the low-level `littlefs_api` functions to read/write/erase blocks that LittleFS library needs. On mounting by `esp_littlefs` the `lfs_t` structures are created. You need to get a handle to these to use ESP with `lv_fs_littlefs`, as all functions use that `lfs_t` in LittleFS to identify the mounted partition.
In case you don't find a special function in the `lv_fs_littlefs` wrapper, you can look for it in the `esp_littlefs` API and use it directly, as `lv_fs_littlefs` and the `esp_littlefs` APIs can be used side-by-side.
### STDIO
Bride to C standard functions on Linux and Windows. For example `fopen`, `fread`, etc.
### POSIX
Bride to POSIX functions on Linux and Windows. For example `open`, `read`, etc.
### WIN32
Bride to Win32 API function. For example `CreateFileA`, `ReadFile`, etc.
@ -63,12 +63,11 @@ See the [Display background](#display-background) section for more details. If t
This configuration (transparent screen and display) could be used to create for example OSD menus where a video is played on a lower layer, and a menu is overlayed on an upper layer.
To handle transparent displays, special (slower) color mixing algorithms need to be used by LVGL so this feature needs to enabled with `LV_COLOR_SCREEN_TRANSP` in `lv_conf.h`.
As this mode operates on the Alpha channel of the pixels `LV_COLOR_DEPTH = 32` is also required. The Alpha channel of 32-bit colors will be 0 where there are no objects and 255 where there are solid objects.
The Alpha channel of 32-bit colors will be 0 where there are no objects and 255 where there are solid objects.
In summary, to enable transparent screens and displays for OSD menu-like UIs:
- Enable `LV_COLOR_SCREEN_TRANSP` in `lv_conf.h`
- Be sure to use `LV_COLOR_DEPTH 32`
- Set the screen's opacity to `LV_OPA_TRANSP` e.g. with `lv_obj_set_style_local_bg_opa(lv_scr_act(), LV_OBJMASK_PART_MAIN, LV_STATE_DEFAULT, LV_OPA_TRANSP)`
- Set the screen's opacity to `LV_OPA_TRANSP` e.g. with `lv_obj_set_style_bg_opa(lv_scr_act(), LV_OPA_TRANSP, LV_PART_MAIN)`
- Set the display opacity to `LV_OPA_TRANSP` with `lv_disp_set_bg_opa(NULL, LV_OPA_TRANSP);`
@ -34,11 +34,11 @@ lv_label_set_text(label2, "Button 2"); /*Set the text of the label*/
lv_obj_del(label2);
```
## Bring to the foreground
## Change order
There are four explicit ways to bring an object to the foreground:
- Use `lv_obj_move_foreground(obj)` to bring an object to the foreground. Similarly, use `lv_obj_move_background(obj)` to move it to the background.
- Use `lv_obj_move_up(obj)` to move an object one position up in the hierarchy, Similarly, use `lv_obj_move_down(obj)` to move an object one position down in the hierarchy.
- Use `lv_obj_move_to_index(obj, idx)` to move an object to a given index in the order of children. (0: backgroud, child_num - 1: foreground, <0:countfromthetop,tomoveforward(up):`lv_obj_move_to_index(obj, lv_obj_get_index(obj) - 1)`)
- Use `lv_obj_swap(obj1, obj2)` to swap the relative layer position of two objects.
- When `lv_obj_set_parent(obj, new_parent)` is used, `obj` will be on the foreground of the `new_parent`.
@ -173,7 +173,7 @@ All inputs are disabled during the screen animation.
Screens are created on the currently selected *default display*.
The *default display* is the last registered display with `lv_disp_drv_register`. You can also explicitly select a new default display using `lv_disp_set_default(disp)`.
`lv_scr_act()`, `lv_scr_load()` and `lv_scr_load_anim()` operate on the default screen.
`lv_scr_act()`, `lv_scr_load()` and `lv_scr_load_anim()` operate on the default display.
Visit [Multi-display support](/overview/display) to learn more.
Arm-2D is not a GPU but **an abstraction layer for 2D GPUs dedicated to Microcontrollers**. It supports all Cortex-M processors ranging from Cortex-M0 to the latest Cortex-M85.
Arm-2D is an open-source project on Github. For more, please refer to: https://github.com/ARM-software/Arm-2D.
## How to Use
In general, you can set the macro `LV_USE_GPU_ARM2D` to `1`in `lv_conf.h` to enable Arm-2D acceleration for LVGL.
If you are using **[CMSIS-Pack](https://github.com/lvgl/lvgl/tree/master/env_support/cmsis-pack)** to deploy the LVGL. You don't have to define the macro `LV_USE_GPU_ARM2D` manually, instead, please select the component `GPU Arm-2D` in the **RTE** dialog. This step will define the macro for us.
## Design Considerations
As mentioned before, Arm-2D is an abstraction layer for 2D GPU; hence if there is no accelerator or dedicated instruction set (such as Helium or ACI) available for Arm-2D, it provides negligible performance boost for LVGL (sometimes worse) for regular Cortex-M processors.
**We highly recommend you enable Arm-2D acceleration for LVGL** when:
- The target processors are **Cortex-M55** and/or **Cortex-M85**
- The target processors support **[Helium](https://developer.arm.com/documentation/102102/0103/?lang=en)**.
- The device vendor provides an arm-2d compliant driver for their propriotory 2D accelerators and/or customized instruction set.
- The target device contains [DMA-350](https://community.arm.com/arm-community-blogs/b/internet-of-things-blog/posts/arm-corelink-dma-350-next-generation-direct-memory-access-for-endpoint-ai)
## Examples
- [A Cortex-M55 (supports Helium) based MDK Project, PC emulation is available.](https://github.com/lvgl/lv_port_an547_cm55_sim)
First draw the object on the layer, then scale down layer opacity factor. Value 0, `LV_OPA_0` or `LV_OPA_TRANSP` means fully transparent, 255, `LV_OPA_100` or `LV_OPA_COVER` means fully covering, other values or LV_OPA_10, LV_OPA_20, etc means semi transparency.
@ -772,7 +781,7 @@ Describes how to blend the colors to the background. The possible values are `LV
</ul>
### layout
Set the layout if the object. The children will be repositioned and resized according to the policies set for the layout. For the possible values see the documentation of the layouts.
Set the layout of the object. The children will be repositioned and resized according to the policies set for the layout. For the possible values see the documentation of the layouts.
@ -204,6 +204,10 @@ The default rotation of your display when it is initialized can be set using the
Display rotation can also be changed at runtime using the `lv_disp_set_rotation(disp, rot)` API.
If you enable rotation the coordinates of the pointer input devices (e.g. touchpad) will be rotated too.
Note that when using software rotation, you cannot use neither `direct_mode` nor `full_refresh` in the driver. When using either of these, you will have to rotate the pixels yourself e.g. in the `flush_cb`.
Support for software rotation is a new feature, so there may be some glitches/bugs depending on your configuration. If you encounter a problem please open an issue on [GitHub](https://github.com/lvgl/lvgl/issues).
@ -114,7 +114,7 @@ You need to have 3 buttons available:
- `LV_KEY_RIGHT` will simulate turning encoder right
- other keys will be passed to the focused widget
If you hold the keys it will simulate an encoder advance with period specified in `indev_drv.long_press_rep_time`.
If you hold the keys it will simulate an encoder advance with period specified in `indev_drv.long_press_repeat_time`.
```c
indev_drv.type = LV_INDEV_TYPE_ENCODER;
@ -172,7 +172,7 @@ The default value of the following parameters can be changed in `lv_indev_drv_t`
- `scroll_limit` Number of pixels to slide before actually scrolling the object.
- `scroll_throw` Scroll throw (momentum) slow-down in [%]. Greater value means faster slow-down.
- `long_press_time` Press time to send `LV_EVENT_LONG_PRESSED` (in milliseconds)
- `long_press_rep_time` Interval of sending `LV_EVENT_LONG_PRESSED_REPEAT` (in milliseconds)
- `long_press_repeat_time` Interval of sending `LV_EVENT_LONG_PRESSED_REPEAT` (in milliseconds)
- `read_timer` pointer to the `lv_timer` which reads the input device. Its parameters can be changed by `lv_timer_...()` functions. `LV_INDEV_DEF_READ_PERIOD` in `lv_conf.h` sets the default read period.
**From v8.1 the header is added directly into the Calendar widget and the API of the headers has been changed.**
## Overview
The Calendar object is a classic calendar which can:
@ -13,13 +15,16 @@ The Calendar is added to the default group (if it is set). Calendar is an editab
To make the Calendar flexible, by default it doesn't show the current year or month. Instead, there are optional "headers" that can be attached to the calendar.
## Parts and Styles
The calendar object uses the [Button matrix](/widgets/core/btnmatrix) object under the hood to arrange the days into a matrix.
- `LV_PART_MAIN` The background of the calendar. Uses all the background related style properties.
- `LV_PART_ITEMS` Refers to the dates and day names. Button matrix control flags are set to differentiate the buttons and a custom drawer event is added modify the properties of the buttons as follows:
- day names have no border, no background and drawn with a gray color
- days of the previous and next month have `LV_BTNMATRIX_CTRL_DISABLED` flag
- today has a thicker border with the theme's primary color
- highlighted days have some opacity with the theme's primary color.
The Calendar is composed of 3 widegets
- Container: A rectangle which is a container for the *Header* and the *Days*. Uses only `LV_PART_MAIN` where all the background related style properties are working.
- Days: It's a [Button matrix](/widgets/core/btnmatrix) object under the hood to arrange the days into a matrix. `lv_calendar_get_btnmatrix(calendar)` can be used to get it.
- `LV_PART_MAIN` The background of the calendar. Uses all the background related style properties.
- `LV_PART_ITEMS` Refers to the dates and day names. Button matrix control flags are set to differentiate the buttons and a custom drawer event is added modify the properties of the buttons as follows:
- day names have no border, no background and drawn with a gray color
- days of the previous and next month have `LV_BTNMATRIX_CTRL_DISABLED` flag
- today has a thicker border with the theme's primary color
- highlighted days have some opacity with the theme's primary color.
- Header: Not created by default, the details are up to the given header.
## Usage
@ -53,8 +58,6 @@ Learn more about [Keys](/overview/indev).
## Headers
**From v8.1 the header is added directly into the Calendar widget and the API of the headers has been changed.**
### Arrow buttons
`lv_calendar_header_arrow_create(calendar)` creates a header that contains a left and right arrow on the sides and a text with the current year and month between them.
<description>LVGL (Light and Versatile Graphics Library) is a free and open-source graphics library providing everything you need to create an embedded GUI with easy-to-use graphical elements, beautiful visual effects and a low memory footprint.</description>
<description>LVGL (Light and Versatile Graphics Library) is a free and open-source graphics library providing everything you need to create an embedded GUI with easy-to-use graphical elements, beautiful visual effects and a low memory footprint.</description>
SquareLine Studio can automatically put the generated C files into `ui` folder, so that rt-thread will automatically detect them; or, as a user, you can move the generated C files into `ui` folder manually.
"description":"Graphics library to create embedded GUI with easy-to-use graphical elements, beautiful visual effects and low memory footprint. It offers anti-aliasing, opacity, and animations using only one frame buffer.",
'dsc':"Scale down all opacity values of the object by this factor. Value 0, `LV_OPA_0` or `LV_OPA_TRANSP` means fully transparent, 255, `LV_OPA_100` or `LV_OPA_COVER` means fully covering, other values or LV_OPA_10, LV_OPA_20, etc means semi transparency."},
'dsc':"First draw the object on the layer, then scale down layer opacity factor. Value 0, `LV_OPA_0` or `LV_OPA_TRANSP` means fully transparent, 255, `LV_OPA_100` or `LV_OPA_COVER` means fully covering, other values or LV_OPA_10, LV_OPA_20, etc means semi transparency."},
'dsc':"Set the layout if the object. The children will be repositioned and resized according to the policies set for the layout. For the possible values see the documentation of the layouts."},
'dsc':"Set the layout of the object. The children will be repositioned and resized according to the policies set for the layout. For the possible values see the documentation of the layouts."},