Viewport code example.

plugins/minimal_viewport/minimal_viewport_app.c

@@ -0,0 +1,43 @@
+#include <furi.h>
+#include <gui/gui.h>
+typedef struct {
+    int type;
+    InputEvent input;
+} AppEvent;
+static void input_callback(InputEvent* input_event, void* ctx) {
+    FuriMessageQueue* queue = ctx;
+    AppEvent event = {
+        .type = input_event->type,
+        .input = *input_event,
+    };
+    furi_message_queue_put(queue, &event, FuriWaitForever);
+}
+static void render_callback(Canvas* canvas, void* ctx) {
+    UNUSED(ctx);
+    canvas_set_font(canvas, FontPrimary);
+    canvas_draw_str_aligned(canvas, 15, 30, AlignLeft, AlignTop, "HELLO WORLD!");
+}
+//static ViewPort* view_port = view_port_alloc();
+int32_t minimal_viewport_demo_app(void* p) {
+    UNUSED(p);
+    FuriMessageQueue* queue = furi_message_queue_alloc(8, sizeof(AppEvent));
+    ViewPort* view_port = view_port_alloc();
+    view_port_input_callback_set(view_port, input_callback, queue);
+    view_port_draw_callback_set(view_port, render_callback, NULL);
+    Gui* gui = furi_record_open(RECORD_GUI);
+    gui_add_view_port(gui, view_port, GuiLayerFullscreen);
+    bool processing = true;
+    AppEvent event;
+    do {
+        if(furi_message_queue_get(queue, &event, FuriWaitForever) == FuriStatusOk) {
+            if(event.input.type == InputTypeShort && event.input.key == InputKeyBack) {
+                processing = false;
+            }
+        }
+    } while(processing);
+    view_port_enabled_set(view_port, false);
+    gui_remove_view_port(gui, view_port);
+    view_port_free(view_port);
+    furi_record_close(RECORD_GUI);
+    return 0;
+}