From 44a9ccb0ca18314016ef10b4b1b1c7c958d9eabc Mon Sep 17 00:00:00 2001
From: Federico Angelilli <code@fedang.net>
Date: Sun, 17 Mar 2024 15:20:03 +0100
Subject: Add group grow animation

---
 src/animate.c | 35 +++++++++++++++++++++++++++++++++++
 src/animate.h |  4 +++-
 src/comet.c   | 18 ++++++++----------
 3 files changed, 46 insertions(+), 11 deletions(-)

(limited to 'src')

diff --git a/src/animate.c b/src/animate.c
index 313cfa7..387c9b8 100644
--- a/src/animate.c
+++ b/src/animate.c
@@ -179,6 +179,41 @@ Animation *animation_group_shrink_create(gint64 duration)
     return shrink;
 }
 
+static bool grow_func(Animation *grow, Layout *layout)
+{
+    g_assert_false(layout->btn->simple);
+    ButtonGroup *group = (gpointer)layout->btn;
+
+    gint64 end = grow->start + grow->duration;
+    gint64 now = g_get_monotonic_time();
+    if (now > end) return false;
+
+    double t = (double)(now - grow->start) / (end - grow->start);
+    double pos = smoothstep(t, 0, 1);
+
+    int start_w = CAST(layout->children->data, Layout)->width;
+    int width = start_w + pos * (layout->width - start_w);
+    layout->width = width;
+
+    for (GList *it = layout->children, *next = it->next; it; it = next, next = it ? it->next : NULL) {
+        Layout *child = it->data;
+        if (child->x + child->width > layout->x + width)
+            layout->children = g_list_delete_link(layout->children, it);
+    }
+
+    return true;
+}
+
+Animation *animation_group_grow_create(gint64 duration)
+{
+    // Note the 0 initialization
+    Animation *grow = g_malloc0(sizeof(Animation));
+    grow->type = ANIM_GROUP_GROW;
+    grow->layout_func = (LayoutFunc)grow_func;
+    grow->duration = duration;
+    return grow;
+}
+
 void animation_destroy(Animation *anim)
 {
     if (anim == NULL) return;
diff --git a/src/animate.h b/src/animate.h
index 2323017..79b6174 100644
--- a/src/animate.h
+++ b/src/animate.h
@@ -18,7 +18,7 @@ struct Animation {
         ANIM_SHINE,
         ANIM_PULSE,
         ANIM_GROUP_SHRINK,
-        //ANIM_GROUP_GROW,
+        ANIM_GROUP_GROW,
     } type;
     gint64 start;
     gint64 duration;
@@ -42,6 +42,8 @@ Animation *animation_pulse_create(gint64 duration);
 
 Animation *animation_group_shrink_create(gint64 duration);
 
+Animation *animation_group_grow_create(gint64 duration);
+
 void animation_destroy(Animation *anim);
 
 #endif
diff --git a/src/comet.c b/src/comet.c
index b417489..b6c40fd 100644
--- a/src/comet.c
+++ b/src/comet.c
@@ -210,16 +210,14 @@ static void menu_action(Button *btn)
 
     button_simple_set_text(btn, g_strdup(menu_ctx->strings[to_open]), CAST(btn, ButtonSimple)->text_color);
 
-    if (!to_open) {
-        Animation *shrink = animation_group_shrink_create(MILLIS(600));
-
-        if (button_set_animation((gpointer)menu_ctx->group, shrink))
-            state_request_animation(menu_ctx->state);
-        else
-            animation_destroy(shrink);
-    } else {
-        state_request_redraw(menu_ctx->state, true);
-    }
+    Animation *anim = to_open
+        ? animation_group_grow_create(MILLIS(600))
+        : animation_group_shrink_create(MILLIS(600));
+
+    if (button_set_animation((gpointer)menu_ctx->group, anim))
+        state_request_animation(menu_ctx->state);
+    else
+        animation_destroy(anim);
 }
 
 static void register_buttons(State *state, Color color, Color text_color, Color line_color, int line_w)
-- 
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