feat: add zoom mode navigation with keyboard and GUI controls

Co-authored-by: aider (deepseek/deepseek-coder) <aider@aider.chat>

gui.c

@@ -51,6 +51,26 @@ static char plugin_uri_input[256];
 static int plugin_uri_input_len = 0;
 static int selected_channel = 0;
 
+/* ---------------------------------------------------------------------------
+ *  zoom mode state
+ * ------------------------------------------------------------------------- */
+static int zoom_enabled = 0;          /* 0 = normal, 1 = zoomed */
+static int zoom_level = 0;            /* 0 = 1x, 1 = 2x, 2 = 4x */
+static int zoom_focus_scene = 0;      /* which scene is focused when zoomed */
+static int zoom_focus_channel = 0;    /* which channel is focused when zoomed */
+static const int zoom_levels[] = {1, 2, 4};
+static const char *zoom_labels[] = {"1x", "2x", "4x"};
+
+/* ---------------------------------------------------------------------------
+ *  zoom mode state
+ * ------------------------------------------------------------------------- */
+static int zoom_enabled = 0;          /* 0 = normal, 1 = zoomed */
+static int zoom_level = 0;            /* 0 = 1x, 1 = 2x, 2 = 4x */
+static int zoom_focus_scene = 0;      /* which scene is focused when zoomed */
+static int zoom_focus_channel = 0;    /* which channel is focused when zoomed */
+static const int zoom_levels[] = {1, 2, 4};
+static const char *zoom_labels[] = {"1x", "2x", "4x"};
+
 /* ---------------------------------------------------------------------------
  *  drawing helpers (stubs for microui)
  * ------------------------------------------------------------------------- */
@@ -121,6 +141,92 @@ static void gui_update(void)
             }
         }
 
+        /* Zoom mode controls */
+        mu_layout_row(ctx, 2, (int[]) { 60, -1 }, 0);
+        mu_label(ctx, "Zoom:");
+        if (mu_button(ctx, zoom_enabled ? "Disable" : "Enable")) {
+            zoom_enabled = !zoom_enabled;
+            if (!zoom_enabled) {
+                zoom_focus_scene = 0;
+                zoom_focus_channel = 0;
+            }
+        }
+        
+        if (zoom_enabled) {
+            mu_layout_row(ctx, 2, (int[]) { 60, -1 }, 0);
+            mu_label(ctx, "Level:");
+            if (mu_button(ctx, zoom_labels[zoom_level])) {
+                zoom_level = (zoom_level + 1) % 3;
+            }
+            
+            mu_layout_row(ctx, 2, (int[]) { 60, -1 }, 0);
+            mu_label(ctx, "Scene:");
+            {
+                char buf[32];
+                snprintf(buf, sizeof(buf), "%d", zoom_focus_scene + 1);
+                if (mu_button(ctx, buf)) {
+                    /* click to reset? no action needed */
+                }
+            }
+            
+            mu_layout_row(ctx, 2, (int[]) { 60, -1 }, 0);
+            mu_label(ctx, "Channel:");
+            {
+                char buf[32];
+                snprintf(buf, sizeof(buf), "%d", zoom_focus_channel + 1);
+                if (mu_button(ctx, buf)) {
+                    /* click to reset? no action needed */
+                }
+            }
+            
+            /* Navigation hint */
+            mu_layout_row(ctx, 1, (int[]) { -1 }, 0);
+            mu_label(ctx, "Use arrow keys to navigate when zoomed");
+        }
+
+        /* Zoom mode controls */
+        mu_layout_row(ctx, 2, (int[]) { 60, -1 }, 0);
+        mu_label(ctx, "Zoom:");
+        if (mu_button(ctx, zoom_enabled ? "Disable" : "Enable")) {
+            zoom_enabled = !zoom_enabled;
+            if (!zoom_enabled) {
+                zoom_focus_scene = 0;
+                zoom_focus_channel = 0;
+            }
+        }
+        
+        if (zoom_enabled) {
+            mu_layout_row(ctx, 2, (int[]) { 60, -1 }, 0);
+            mu_label(ctx, "Level:");
+            if (mu_button(ctx, zoom_labels[zoom_level])) {
+                zoom_level = (zoom_level + 1) % 3;
+            }
+            
+            mu_layout_row(ctx, 2, (int[]) { 60, -1 }, 0);
+            mu_label(ctx, "Scene:");
+            {
+                char buf[32];
+                snprintf(buf, sizeof(buf), "%d", zoom_focus_scene + 1);
+                if (mu_button(ctx, buf)) {
+                    /* click to reset? no action needed */
+                }
+            }
+            
+            mu_layout_row(ctx, 2, (int[]) { 60, -1 }, 0);
+            mu_label(ctx, "Channel:");
+            {
+                char buf[32];
+                snprintf(buf, sizeof(buf), "%d", zoom_focus_channel + 1);
+                if (mu_button(ctx, buf)) {
+                    /* click to reset? no action needed */
+                }
+            }
+            
+            /* Navigation hint */
+            mu_layout_row(ctx, 1, (int[]) { -1 }, 0);
+            mu_label(ctx, "Use arrow keys to navigate when zoomed");
+        }
+
         /* Plugin URI input */
         mu_layout_row(ctx, 2, (int[]) { 60, -1 }, 0);
         mu_label(ctx, "URI:");
@@ -209,17 +315,45 @@ int gui_main(Engine *engine)
                         g_engine->dispatch(action);
                     }
                     break;
+                case 'z':
+                case 'Z':
+                    zoom_enabled = !zoom_enabled;
+                    if (!zoom_enabled) {
+                        zoom_focus_scene = 0;
+                        zoom_focus_channel = 0;
+                    }
+                    break;
                 case KEY_UP:
-                    bpm = fminf(bpm + 5.0f, 300.0f);
+                    if (zoom_enabled) {
+                        int step = zoom_levels[zoom_level];
+                        zoom_focus_scene = (zoom_focus_scene - step + MAX_SCENES) % MAX_SCENES;
+                    } else {
+                        bpm = fminf(bpm + 5.0f, 300.0f);
+                    }
                     break;
                 case KEY_DOWN:
-                    bpm = fmaxf(bpm - 5.0f, 20.0f);
+                    if (zoom_enabled) {
+                        int step = zoom_levels[zoom_level];
+                        zoom_focus_scene = (zoom_focus_scene + step) % MAX_SCENES;
+                    } else {
+                        bpm = fmaxf(bpm - 5.0f, 20.0f);
+                    }
                     break;
                 case KEY_LEFT:
-                    loop_length = (loop_length > 1) ? loop_length - 1 : 1;
+                    if (zoom_enabled) {
+                        int step = zoom_levels[zoom_level];
+                        zoom_focus_channel = (zoom_focus_channel - step + MAX_CHANNELS) % MAX_CHANNELS;
+                    } else {
+                        loop_length = (loop_length > 1) ? loop_length - 1 : 1;
+                    }
                     break;
                 case KEY_RIGHT:
-                    loop_length = (loop_length < 64) ? loop_length + 1 : 64;
+                    if (zoom_enabled) {
+                        int step = zoom_levels[zoom_level];
+                        zoom_focus_channel = (zoom_focus_channel + step) % MAX_CHANNELS;
+                    } else {
+                        loop_length = (loop_length < 64) ? loop_length + 1 : 64;
+                    }
                     break;
                 default:
                     break;