Simple ViewPort demo - Hello World

2023-06-01 17:16:55 -05:00
parent d0733985b0
commit 808e0772c2
4 changed files with 113 additions and 0 deletions
--- a/ui/viewport_demo/demo.c
+++ b/ui/viewport_demo/demo.c
@@ -0,0 +1,89 @@
+/*
+
+This is an example of using a ViewPort.  It is a simple Hello World program that
+allows you to move a cursor around the screen with the arrow keys.  Pressing
+the back button will exit the program.
+
+Uncomment the different view_port_set_orientation() calls to see how the
+orientation of the screen and keypad change.
+
+The code is from the Message Queue wiki page 
+(https://github.com/jamisonderek/flipper-zero-tutorials/wiki/Message-Queue) and
+also the ViewPort section of the User Interface wiki page
+(https://github.com/jamisonderek/flipper-zero-tutorials/wiki/User-Interface#viewport).
+
+*/
+
+#include <furi.h>
+#include <gui/gui.h>
+
+typedef enum {
+    MyEventTypeKey,
+    MyEventTypeDone,
+} MyEventType;
+
+typedef struct {
+    MyEventType type; // The reason for this event.
+    InputEvent input; // This data is specific to keypress data.
+} MyEvent;
+
+FuriMessageQueue* queue;
+int x = 32;
+int y = 48;
+
+static void my_draw_callback(Canvas* canvas, void* context) {
+    UNUSED(context);
+    canvas_set_font(canvas, FontPrimary);
+    canvas_draw_str(canvas, 5, 30, "Hello world");
+    canvas_draw_str(canvas, x, y, "^");
+}
+
+static void my_input_callback(InputEvent* input_event, void* context) {
+    UNUSED(context);
+    if(input_event->type == InputTypeShort) {
+        if(input_event->key == InputKeyLeft) x--;
+        if(input_event->key == InputKeyRight) x++;
+        if(input_event->key == InputKeyUp) y--;
+        if(input_event->key == InputKeyDown) y++;
+        if(input_event->key == InputKeyBack) {
+            MyEvent event;
+            event.type = MyEventTypeDone;
+            furi_message_queue_put(queue, &event, FuriWaitForever);
+        }
+    }
+}
+
+int32_t viewport_demo_app() {
+    void* my_context = NULL;
+    queue = furi_message_queue_alloc(8, sizeof(MyEvent));
+
+    ViewPort* view_port = view_port_alloc();
+    view_port_draw_callback_set(view_port, my_draw_callback, my_context);
+    view_port_input_callback_set(view_port, my_input_callback, my_context);
+    //view_port_set_orientation(view_port, ViewPortOrientationHorizontal);
+    //view_port_set_orientation(view_port, ViewPortOrientationHorizontalFlip); // upside down
+    view_port_set_orientation(view_port, ViewPortOrientationVertical); // USB/keypad bottom
+    //view_port_set_orientation(view_port, ViewPortOrientationVerticalFlip); // USB/keypad top
+
+    Gui* gui = furi_record_open(RECORD_GUI);
+    gui_add_view_port(gui, view_port, GuiLayerFullscreen);
+
+    MyEvent event;
+    bool keep_processing = true;
+    while(keep_processing) {
+        if(furi_message_queue_get(queue, &event, FuriWaitForever) == FuriStatusOk) {
+            if(event.type == MyEventTypeDone) {
+                keep_processing = false;
+            }
+        } else {
+            keep_processing = false;
+        }
+    }
+
+    furi_message_queue_free(queue);
+    view_port_enabled_set(view_port, false);
+    gui_remove_view_port(gui, view_port);
+    furi_record_close(RECORD_GUI);
+    view_port_free(view_port);
+    return 0;
+}