Message builder: Decoder selection and basic text drawing.

view_build.c

@@ -16,15 +16,48 @@ typedef struct {
                                     // fields.
 } BuildViewPrivData;
 
+/* Not all the decoders support message bulding, so we can't just
+ * increment / decrement the cur_decoder index here. */
+static void select_next_decoder(ProtoViewApp *app) {
+    BuildViewPrivData *privdata = app->view_privdata;
+    do { 
+        privdata->cur_decoder++;
+        if (Decoders[privdata->cur_decoder] == NULL)
+            privdata->cur_decoder = 0;
+    } while(Decoders[privdata->cur_decoder]->get_fields == NULL);
+}
+
+/* Like select_next_decoder() but goes backward. */
+static void select_prev_decoder(ProtoViewApp *app) {
+    BuildViewPrivData *privdata = app->view_privdata;
+    do {
+        if (privdata->cur_decoder == 0) {
+            /* Go one after the last one to wrap around. */
+            while(Decoders[privdata->cur_decoder]) privdata->cur_decoder++;
+        }
+        privdata->cur_decoder--;
+    } while(Decoders[privdata->cur_decoder]->get_fields == NULL);
+}
+
 /* Render the view to select the decoder, among the ones that
  * support message building. */
 static void render_view_select_decoder(Canvas *const canvas, ProtoViewApp *app) {
+    BuildViewPrivData *privdata = app->view_privdata;
     canvas_set_font(canvas, FontPrimary);
     canvas_draw_str(canvas, 0, 9, "Signal builder");
     canvas_set_font(canvas, FontSecondary);
     canvas_draw_str(canvas, 0, 19, "up/down: select, ok: choose");
 
-    UNUSED(app); // XXX
+    // When entering the view, the current decoder is just set to zero.
+    // Seek the next valid if needed.
+    if (Decoders[privdata->cur_decoder]->get_fields == NULL)
+        select_next_decoder(app);
+
+    canvas_set_font(canvas, FontPrimary);
+    canvas_draw_str(canvas, 0, 9, "Signal builder");
+
+    canvas_draw_str_aligned(canvas,64,40,AlignCenter,AlignCenter,
+        Decoders[privdata->cur_decoder]->name);
 }
 
 /* Render the view that allows the user to populate the fields needed
@@ -39,29 +72,50 @@ static void render_view_set_fields(Canvas *const canvas, ProtoViewApp *app) {
     canvas_draw_str(canvas, 0, 9, buf);
     canvas_set_font(canvas, FontSecondary);
     canvas_draw_str(canvas, 0, 19, "up/down: next field, ok: edit");
+    canvas_draw_str(canvas, 0, 62, "Long press ok: create signal");
 }
 
 /* Render the build message view. */
 void render_view_build_message(Canvas *const canvas, ProtoViewApp *app) {
     BuildViewPrivData *privdata = app->view_privdata;
 
-    if (privdata->decoder == NULL)
-        render_view_select_decoder(canvas,app);
-    else
+    if (privdata->decoder)
         render_view_set_fields(canvas,app);
+    else
+        render_view_select_decoder(canvas,app);
 }
 
-/* Handle input for the build message view. */
-void process_input_build_message(ProtoViewApp *app, InputEvent input) {
-    UNUSED(app);
+/* Handle input for the decoder selection. */
+static void process_input_select_decoder(ProtoViewApp *app, InputEvent input) {
+    BuildViewPrivData *privdata = app->view_privdata;
     if (input.type == InputTypeShort) {
         if (input.key == InputKeyOk) {
+            privdata->decoder = Decoders[privdata->cur_decoder];
+            privdata->fieldset = fieldset_new();
+            privdata->decoder->get_fields(privdata->fieldset);
         } else if (input.key == InputKeyDown) {
+            select_next_decoder(app);
         } else if (input.key == InputKeyUp) {
+            select_prev_decoder(app);
         }
     }
 }
 
+/* Handle input for fields editing mode. */
+static void process_input_set_fields(ProtoViewApp *app, InputEvent input) {
+    UNUSED(app);
+    UNUSED(input);
+}
+
+/* Handle input for the build message view. */
+void process_input_build_message(ProtoViewApp *app, InputEvent input) {
+    BuildViewPrivData *privdata = app->view_privdata;
+    if (privdata->decoder)
+        process_input_set_fields(app,input);
+    else
+        process_input_select_decoder(app,input);
+}
+
 /* Called on exit for cleanup. */
 void view_exit_build_message(ProtoViewApp *app) {
     BuildViewPrivData *privdata = app->view_privdata;