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

src/node_panel_brush.cpp

@@ -62,6 +62,7 @@ void NodePanelBrush::init()
             brush->loaded();
             brush->set_icon(path.c_str());
             brush->m_brushID = count++;
+            brush->thumb_path = path;
             brush->high_path = path_hi;
             brush->brush_name = i;
             brush->high_id = const_hash(path_hi.c_str());
@@ -71,6 +72,24 @@ void NodePanelBrush::init()
     }
 }
 
+kEventResult NodePanelBrush::handle_event(Event* e)
+{
+    switch (e->m_type)
+    {
+    case kEventType::MouseUpL:
+        if (!m_mouse_inside)
+        {
+            mouse_release();
+            destroy();
+        }
+        break;
+    default:
+        return kEventResult::Available;
+        break;
+    }
+    return kEventResult::Consumed;
+}
+
 void NodePanelBrush::handle_click(Node* target)
 {
     if (target == m_current)
@@ -101,6 +120,11 @@ uint16_t NodePanelBrush::get_texture_id(int index) const
     return m_brushes[index]->high_id;
 }
 
+std::string NodePanelBrush::get_thumb_path(int index) const
+{
+    return m_brushes[index]->thumb_path;
+}
+
 int NodePanelBrush::get_brush_id(int index) const
 {
     return m_brushes[index]->m_brushID;
@@ -174,6 +198,7 @@ void NodePanelBrushPreset::init()
             brush->loaded();
 //            brush->set_icon(path.c_str());
             brush->m_brushID = count++;
+            brush->thumb_path = path;
             brush->high_path = path_hi;
             brush->high_id = const_hash(path_hi.c_str());
             brush->m_brush.m_tex_id = const_hash(path.c_str());