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|
# SwiftLVGL
Yet another Swift wrapper for LVGL
```swift
@main
struct Main {
static func main() {
lv_init()
let _ = lv_sdl_window_create(480, 480)
let _ = lv_sdl_mouse_create()
var myCounter: Int = 0
let label = LVGLLabel("", alignment: .bottomMid)
let button = LVGLButton("Click Me", eventType: .pressed) { event in
if let event = event, event.eventCode == .pressed {
myCounter += 1
label.setText("You clicked the button \(myCounter) times")
}
}
let _ = LVGLButton("Shift Button", alignment: .bottomRight, eventType: .pressed) { event in
button.align(alignment: .leftMid)
}
let _ = LVGLSlider("", alignment: .topMid, yOffset: 50)
let _ = LVGLSwitch(alignment: .rightMid)
while true {
lv_timer_handler()
usleep(5000)
}
}
}
```
You can run this example by running the `SwiftLVGLDemo` target.
## Dependencies
For running `SwiftLVGLDemo` you will need to install the SDL2 library.
On macOS, you can install SDL2 using Homebrew:
```
brew install sdl2
```
On Debian based distros, you can install SDL2 by using apt:
```
sudo apt update && sudo apt install libsdl2-dev
```
This package defaults to using a minimal lvgl configuration with SDL2 enabled. To provide your own `LV_CONF.h` set `LV_CONF_PATH=<path_to_conf>` in your environment (I think you will have to disable building LVGLSwiftDemo)
## Using with Embedded Swift
Since the `SwiftLVGL` target build requires sdl2, I haven't tried to directly use this as a Swift package for embedded Swift.
Instead, the `combine.py` script dumps the content of SwiftLVGL into a single file named `SwiftyLVGL`. You can then integrate this in your CMakefile by building it with your custom `LV_CONF.h` file residing in the include directory in your project root.
Example CMakeLists.txt
```
cmake_minimum_required(VERSION 3.29)
set(ENV{TOOLCHAINS} "Swift Development Snapshot")
...
include_directories(./include)
add_subdirectory(lib/lvgl)
include_directories(./lib/lvgl)
...
add_definitions(-DLV_CONF_PATH="${PROJECT_SOURCE_DIR}/include/lv_conf.h")
...
add_custom_command(
OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/_swiftcode.o
COMMAND
${SWIFTC}
-target armv6m-none-none-eabi -Xcc -mfloat-abi=soft -Xcc -fshort-enums
-Xcc -DCYW43_LWIP
-Xcc -DPICO_CYW43_ARCH_THREADSAFE_BACKGROUND
-Xcc -I$ENV{PICO_SDK_PATH}/lib/lwip/src/include
-Xcc -I${CMAKE_CURRENT_LIST_DIR}/include
-Xfrontend -function-sections -enable-experimental-feature Embedded -wmo -parse-as-library
#-no-allocations
$$\( echo '$<TARGET_PROPERTY:pico-swift-display,INCLUDE_DIRECTORIES>' | tr '\;' '\\n' | sed -e 's/\\\(.*\\\)/-Xcc -I\\1/g' \)
$$\( echo '${CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES}' | tr ' ' '\\n' | sed -e 's/\\\(.*\\\)/-Xcc -I\\1/g' \)
-import-bridging-header ${CMAKE_CURRENT_LIST_DIR}/BridgingHeader.h
${CMAKE_CURRENT_LIST_DIR}/Main.swift
${CMAKE_CURRENT_LIST_DIR}/SwiftyLVGL.swift
-c -o ${CMAKE_CURRENT_BINARY_DIR}/_swiftcode.o
DEPENDS
${CMAKE_CURRENT_LIST_DIR}/BridgingHeader.h
${CMAKE_CURRENT_LIST_DIR}/Main.swift
${CMAKE_CURRENT_LIST_DIR}/SwiftyLVGL.swift
)
```
Where `./lib/lvgl` contains the git repository for `lvgl` and your `BridgingHeader.h` contains
```
...
#include "lvgl.h"
...
```
|
