drag canvas, render layers and tmp, add/select layer, opacity for layer, color bucket filler

engine/app.cpp

@@ -338,6 +338,24 @@ void App::initLayout()
                 on_stroke_change();
         };
 
+        layers->on_layer_add = [this](Node*) {
+            canvas->m_canvas->layer_add("asd");
+        };
+
+        layers->on_layer_change = [this](Node*, int old_idx, int new_idx) {
+            canvas->m_canvas->m_current_layer_idx = new_idx;
+        };
+
+        layers->on_layer_opacity_changed = [this](Node*, int idx, float value) {
+            canvas->m_canvas->m_layers[idx].m_opacity = value;
+        };
+
+        if (auto* button = layout[main_id]->find<NodeButtonCustom>("btn-bucket"))
+        {
+            button->on_click = [this](Node*) {
+                canvas->m_canvas->clear(canvas->m_brush.m_tip_color);
+            };
+        }
         if (auto* button = layout[main_id]->find<NodeButtonCustom>("btn-stroke"))
         {
             button->on_click = [this](Node*) {