jfkeys: add key overrides on fx-CG 50

include/justui/jfkeys.h

@@ -60,6 +60,7 @@ typedef struct {
 
 	#ifdef FXCG50
 	char const *labels;
+  char const *overrides[6];
 	#endif
 
 } jfkeys;
@@ -101,4 +102,16 @@ int jfkeys_level(jfkeys *keys);
 /* jfkeys_set_level(): Set the function key level */
 void jfkeys_set_level(jfkeys *keys, int level);
 
+/* The following functions are available only on fx-CG 50 and are no-ops on
+   fx-9860 (you can't generate a good image for a tiny key). */
+
+/* fkeys_override(): Get the override for a key */
+char const *jfkeys_override(jfkeys *keys, int key);
+
+/* fkeys_set_override(): Override the value of a single key on all levels
+   This functions sets the override on the specified key, which replaces the
+   label for that key on all levels. This is useful to conditionally show
+   functions. */
+void jfkeys_set_override(jfkeys *keys, int key, char const *override);
+
 #endif /* _J_JFKEYS */

src/jfkeys.c

@@ -1,5 +1,6 @@
 #include <justui/jfkeys.h>
 #include <justui/jwidget-api.h>
+#include <gint/defs/attributes.h>
 #include <gint/std/stdlib.h>
 #include <gint/std/string.h>
 
@@ -14,6 +15,7 @@ jfkeys *jfkeys_create(bopti_image_t const *img, void *parent)
 	jfkeys *f = malloc(sizeof *f);
 	jwidget_init(&f->widget, jfkeys_type_id, parent);
 	jfkeys_set(f, img);
+
 	return f;
 }
 
@@ -32,6 +34,7 @@ jfkeys *jfkeys_create(char const *labels, void *parent)
 	jfkeys *f = malloc(sizeof *f);
 	jwidget_init(&f->widget, jfkeys_type_id, parent);
 	jfkeys_set(f, labels);
+	for(int i = 0; i < 6; i++) f->overrides[i] = NULL;
 	return f;
 }
 
@@ -112,7 +115,11 @@ static void jfkeys_poly_render(void *f0, int base_x, int y)
 
 	for(int position = 0; position < 6; position++) {
 		size_t length = 0;
-		char const *text = get_label(level, position, &length);
+		char const *text = NULL;
+		#ifdef FXCG50
+		text = f->overrides[position];
+		#endif
+		if(!text) text = get_label(level, position, &length);
 		if(!text || (*text != '.' && *text != '/' && *text != '@'
 			&& *text != '#')) continue;
 
@@ -161,6 +168,25 @@ void jfkeys_set_level(jfkeys *f, int level)
 	f->widget.update = 1;
 }
 
+char const *jfkeys_override(GUNUSED jfkeys *keys, GUNUSED int key)
+{
+	#ifdef FXCG50
+	if(key < 1 || key > 6) return NULL;
+	return keys->overrides[key - 1];
+	#endif
+
+	return NULL;
+}
+
+void jfkeys_set_override(GUNUSED jfkeys *keys, GUNUSED int key,
+	GUNUSED char const *override)
+{
+	#ifdef FXCG50
+	if(key < 1 || key > 6) return;
+	keys->overrides[key - 1] = override;
+	#endif
+}
+
 /* jfkeys type definition */
 static jwidget_poly type_jfkeys = {
 	.name    = "jfkeys",