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add a very (very) basic resize/layout design to the canvas

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Items call ::queue_resize(), which sets a flag in the canvas; at next idle, we call
Canvas::layout() which walks the item tree and recursively calls layout (depth first)
on all items needing a resize.

Only Container types implement layout, and so far only Box
This commit is contained in:
Paul Davis 2018-11-19 11:31:09 -05:00
parent 03e32a22d0
commit 12b4807bc9
6 changed files with 197 additions and 99 deletions
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6
libs/canvas/canvas/canvas.h
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@ -83,6 +83,8 @@ public:
virtual void grab (Item *) = 0;
/** called to ask the canvas' host to `ungrab' any grabbed item */
virtual void ungrab () = 0;
/** called to ask for a resize/relayout of all or part of the canvas */
virtual void queue_resize () = 0;
/** called to ask the canvas' host to keyboard focus on an item */
virtual void focus (Item *) = 0;
@ -187,6 +189,7 @@ protected:
static uint32_t tooltip_timeout_msecs;
void queue_draw_item_area (Item *, Rect);
virtual void pick_current_item (int state) = 0;
virtual void pick_current_item (Duple const &, int state) = 0;
@ -227,6 +230,7 @@ public:
void queue_draw ();
void queue_draw_area (int x, int y, int width, int height);
void queue_resize ();
Glib::RefPtr<Pango::Context> get_pango_context();
@ -288,8 +292,10 @@ private:
bool show_tooltip ();
void hide_tooltip ();
bool really_start_tooltip_timeout ();
bool resize_handler ();
bool _in_dtor;
bool resize_queued;
void* _nsglview;
Cairo::RefPtr<Cairo::Surface> _canvas_image;