add animation playback

src/node_panel_animation.h

@@ -5,6 +5,7 @@
 #include "node_text.h"
 #include "node_checkbox.h"
 #include "node_button_custom.h"
+#include "node_combobox.h"
 
 class NodeAnimationFrame : public NodeButtonCustom
 {
@@ -43,6 +44,9 @@ public:
 
 class NodePanelAnimation : public Node
 {
+    NodeButtonCustom* btn_next = nullptr;
+    NodeButtonCustom* btn_prev = nullptr;
+    NodeButtonCustom* btn_play = nullptr;
     NodeButtonCustom* btn_add = nullptr;
     NodeButtonCustom* btn_remove = nullptr;
     NodeButtonCustom* btn_up = nullptr;
@@ -52,8 +56,10 @@ class NodePanelAnimation : public Node
     Node* m_frames_container = nullptr;
     NodeAnimationFrame* m_selected_frame = nullptr;
     NodeAnimationTimeline* m_timeline = nullptr;
+    NodeComboBox* m_fps = nullptr;
     int m_selected_frame_index = -1;
     uint32_t m_selected_frame_layer_id = 0;
+    float m_playback_timer = 0;
 public:
     using this_class = NodePanelAnimation;
     using parent = Node;
@@ -62,7 +68,8 @@ public:
     virtual void clone_finalize(Node* dest) const override;
     virtual void init() override;
     virtual void added(Node* parent) override;
-    
+    virtual void on_tick(float dt) override;
+
     void init_controls();
     void load_layers();
 };