diff options
Diffstat (limited to 'libs/canvas/canvas/item.h')
| -rw-r--r-- | libs/canvas/canvas/item.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/libs/canvas/canvas/item.h b/libs/canvas/canvas/item.h index 02f84a62ee..4088011a01 100644 --- a/libs/canvas/canvas/item.h +++ b/libs/canvas/canvas/item.h @@ -75,6 +75,13 @@ public: */ virtual void render (Rect const & area, Cairo::RefPtr<Cairo::Context>) const = 0; + /** Item has changed will be rendered in next render pass so give item a + * chance to perhaps schedule work in another thread etc. + * + * @param area Area to draw, in **window** coordinates + */ + virtual void prepare_for_render (Rect const & area) const { } + /** Adds one or more items to the vector @param items based on their * covering @param point which is in **window** coordinates * @@ -309,6 +316,7 @@ protected: void add_child_bounding_boxes (bool include_hidden = false) const; void render_children (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const; + void prepare_for_render_children (Rect const & area) const; Duple scroll_offset() const; Duple position_offset() const; |