From c7a8b75933b3bd963e19f1a9d85f3b610a08e669 Mon Sep 17 00:00:00 2001
From: Federico Angelilli <code@fedang.net>
Date: Thu, 14 Mar 2024 15:44:41 +0100
Subject: Change animation code and refactor state

---
 src/state.c | 63 +++++++++++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 47 insertions(+), 16 deletions(-)

(limited to 'src/state.c')

diff --git a/src/state.c b/src/state.c
index 134e644..0f17695 100644
--- a/src/state.c
+++ b/src/state.c
@@ -1,17 +1,14 @@
 #include <glib.h>
 
 #include "state.h"
+#include "log.h"
 
 State *state_create(Window *win, Drawer *draw)
 {
-    State *state = g_malloc(sizeof(State));
+    State *state = g_malloc0(sizeof(State));
     g_assert_nonnull(state);
-
     state->win = win;
     state->draw = draw;
-    state->btns = NULL;
-    state->id = 0;
-
     return state;
 }
 
@@ -40,9 +37,9 @@ void state_order_button(State *state)
     state->btns = g_list_sort(state->btns, align_compare);
 }
 
-static gboolean redraw_handler(gpointer data)
+static gboolean redraw_handler(State *state)
 {
-    State *state = data;
+    log_debug("Redrawing once [relayout=%d]", state->relayout);
 
     if (state->relayout) {
         draw_compute_layout(state->draw, state->win, state->btns);
@@ -51,22 +48,56 @@ static gboolean redraw_handler(gpointer data)
 
     draw_paint(state->draw, state->win);
 
-    state->id = 0;
+    state->idle_id = 0;
     return G_SOURCE_REMOVE;
 }
 
-void state_redraw(State *state, bool changed_layout)
+void state_request_redraw(State *state, bool relayout)
 {
-    if (state->id != 0) {
-        if (!changed_layout || state->relayout)
-            return;
+    // Override old redraw
+    if (state->idle_id != 0)
+        g_source_remove(state->idle_id);
+
+    state->relayout = relayout;
+
+    if (state->anim_id != 0) return;
+
+    state->idle_id = g_idle_add(G_SOURCE_FUNC(redraw_handler), state);
+}
+
+static gboolean anim_handler(State *state)
+{
+    //log_debug("Animating [relayout=%d]", state->relayout);
+
+    if (state->relayout) {
+        draw_compute_layout(state->draw, state->win, state->btns);
+        state->relayout = false;
+    }
+
+    draw_paint(state->draw, state->win);
 
-        // If we should relayout override old redraw
-        g_source_remove(state->id);
+    for (GList *it = state->btns; it != NULL; it = it->next) {
+        Button *btn = it->data;
+        if (btn->anim != NULL)
+            return G_SOURCE_CONTINUE;
     }
 
-    state->relayout = changed_layout;
-    state->id = g_idle_add_full(G_PRIORITY_HIGH_IDLE, redraw_handler, state, NULL);
+    state->anim_id = 0;
+    return G_SOURCE_REMOVE;
+}
+
+void state_request_animation(State *state)
+{
+    if (state->idle_id != 0) {
+        g_source_remove(state->idle_id);
+        state->idle_id = 0;
+    }
+
+    if (state->anim_id != 0) return;
+    if (!anim_handler(state)) return;
+
+    const int fps = 60;
+    state->anim_id = g_timeout_add(1000 / fps, G_SOURCE_FUNC(anim_handler), state);
 }
 
 void state_destroy(State *state)
-- 
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