flipper-zero-tutorials/plugins/basic/basic_view_port_demo_app.c

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/*
@CodeAllNight
https://github.com/jamisonderek/flipper-zero-tutorials
This is a basic application for the Flipper Zero.
The goal of this project is to use it as a starting point for other applications.
*/
#include <furi.h>
#include <furi_hal.h>
#include <furi_hal_gpio.h>
#include <furi_hal_resources.h>
#include <gui/gui.h>
#include <locale/locale.h>
#define TAG "basic_demo_app"
typedef enum {
DemoEventTypeKey,
// You can add additional events here.
} DemoEventType;
typedef struct {
DemoEventType type; // The reason for this event.
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InputEvent input; // This data is specific to keypress data.
// You can add additional data that is helpful for your events.
} DemoEvent;
typedef struct {
FuriString* buffer;
// You can add additional state here.
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int32_t counter;
} DemoData;
typedef struct {
FuriMessageQueue* queue; // Message queue (DemoEvent items to process).
FuriMutex* mutex; // Used to provide thread safe access to data.
DemoData* data; // Data accessed by multiple threads (acquire the mutex before accessing!)
} DemoContext;
// Invoked when input (button press) is detected. We queue a message and then return to the caller.
static void basic_demo_input_callback(InputEvent* input_event, FuriMessageQueue* queue) {
furi_assert(queue);
DemoEvent event = {.type = DemoEventTypeKey, .input = *input_event};
furi_message_queue_put(queue, &event, FuriWaitForever);
}
// Invoked by the draw callback to render the screen. We render our UI on the callback thread.
static void basic_demo_render_callback(Canvas* canvas, void* ctx) {
// Attempt to aquire context, so we can read the data.
DemoContext* demo_context = ctx;
if(furi_mutex_acquire(demo_context->mutex, 200) != FuriStatusOk) {
return;
}
DemoData* data = demo_context->data;
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furi_string_printf(data->buffer, "Basic ViewPort demo");
canvas_set_font(canvas, FontPrimary);
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canvas_draw_str_aligned(
canvas, 15, 25, AlignLeft, AlignTop, furi_string_get_cstr(data->buffer));
furi_string_printf(data->buffer, "OK pressed");
furi_string_cat_printf(data->buffer, " %ld times.", data->counter);
canvas_set_font(canvas, FontSecondary);
canvas_draw_str_aligned(
canvas, 15, 40, AlignLeft, AlignTop, furi_string_get_cstr(data->buffer));
// Release the context, so other threads can update the data.
furi_mutex_release(demo_context->mutex);
}
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int32_t basic_view_port_demo_app(void* p) {
UNUSED(p);
// Configure our initial data.
DemoContext* demo_context = malloc(sizeof(DemoContext));
demo_context->mutex = furi_mutex_alloc(FuriMutexTypeNormal);
demo_context->data = malloc(sizeof(DemoData));
demo_context->data->buffer = furi_string_alloc();
// Queue for events (tick or input)
demo_context->queue = furi_message_queue_alloc(8, sizeof(DemoEvent));
// Set ViewPort callbacks
ViewPort* view_port = view_port_alloc();
view_port_draw_callback_set(view_port, basic_demo_render_callback, demo_context);
view_port_input_callback_set(view_port, basic_demo_input_callback, demo_context->queue);
// Open GUI and register view_port
Gui* gui = furi_record_open(RECORD_GUI);
gui_add_view_port(gui, view_port, GuiLayerFullscreen);
// Main loop
DemoEvent event;
bool processing = true;
do {
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if(furi_message_queue_get(demo_context->queue, &event, FuriWaitForever) == FuriStatusOk) {
FURI_LOG_T(TAG, "Got event type: %d", event.type);
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switch(event.type) {
case DemoEventTypeKey:
// Short press of back button exits the program.
if(event.input.type == InputTypeShort && event.input.key == InputKeyBack) {
FURI_LOG_I(TAG, "Short-Back pressed. Exiting program.");
processing = false;
} else if(event.input.type == InputTypeShort && event.input.key == InputKeyOk) {
FURI_LOG_I(TAG, "Short-OK pressed.");
if(furi_mutex_acquire(demo_context->mutex, FuriWaitForever) == FuriStatusOk) {
demo_context->data->counter++;
furi_mutex_release(demo_context->mutex);
}
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}
default:
break;
}
// Send signal to update the screen (callback will get invoked at some point later.)
view_port_update(view_port);
} else {
// We had an issue getting message from the queue, so exit application.
processing = false;
}
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} while(processing);
// Free resources
view_port_enabled_set(view_port, false);
gui_remove_view_port(gui, view_port);
view_port_free(view_port);
furi_record_close(RECORD_GUI);
furi_message_queue_free(demo_context->queue);
furi_mutex_free(demo_context->mutex);
furi_string_free(demo_context->data->buffer);
free(demo_context->data);
free(demo_context);
return 0;
}