implement tip popup tip selection and change default brush color to black

src/node_panel_stroke.cpp

@@ -98,6 +98,35 @@ void NodePanelStroke::init_controls()
             }
         });
     };
+
+    m_brush_popup = std::make_shared<NodePanelBrush>();
+    m_brush_popup->m_manager = m_manager;
+    m_brush_popup->init();
+    m_brush_popup->create();
+    m_brush_popup->loaded();
+    m_brush_popup->SetPositioning(YGPositionTypeAbsolute);
+    m_brush_popup->SetSize(400, 400);
+    m_brush_popup->m_mouse_ignore = false;
+    m_brush_popup->m_flood_events = true;
+    m_brush_popup->m_capture_children = false;
+
+    m_brush_thumb = find<NodeImage>("tip-change-thumb");
+    m_brush_button = find<NodeButtonCustom>("tip-change");
+    m_brush_button->on_click = [this](Node*) {
+        glm::vec2 pos = m_brush_button->m_pos + glm::vec2(m_brush_button->m_size.x, 0);
+        root()->add_child(m_brush_popup);
+        m_brush_popup->SetPosition(pos.x, pos.y);
+        m_brush_popup->mouse_capture();
+        root()->update();
+
+        m_brush_popup->on_brush_changed = [this](Node*, int index) {
+            if (on_brush_changed)
+                on_brush_changed(this, m_brush_popup->get_brush_id(index), m_brush_popup->get_texture_id(index));
+            m_brush_thumb->set_image(m_brush_popup->get_thumb_path(index));
+            m_brush_popup->mouse_release();
+            m_brush_popup->parent->remove_child(m_brush_popup.get());
+        };
+    };
 }
 
 void NodePanelStroke::init_slider(NodeSliderH*& target, const char* id, float Brush::* prop)