diff options
Diffstat (limited to 'lib/wx/examples/demo/ex_canvas.erl')
| -rw-r--r-- | lib/wx/examples/demo/ex_canvas.erl | 47 |
1 files changed, 42 insertions, 5 deletions
diff --git a/lib/wx/examples/demo/ex_canvas.erl b/lib/wx/examples/demo/ex_canvas.erl index 1cbb96de1f..cdc783055c 100644 --- a/lib/wx/examples/demo/ex_canvas.erl +++ b/lib/wx/examples/demo/ex_canvas.erl @@ -35,7 +35,9 @@ parent, config, canvas, - bitmap + bitmap, + overlay, + pos }). start(Config) -> @@ -60,6 +62,10 @@ do_init(Config) -> wxPanel:connect(Canvas, paint, [callback]), wxPanel:connect(Canvas, size), + wxPanel:connect(Canvas, left_down), + wxPanel:connect(Canvas, left_up), + wxPanel:connect(Canvas, motion), + wxPanel:connect(Button, command_button_clicked), %% Add to sizers @@ -78,7 +84,9 @@ do_init(Config) -> Bitmap = wxBitmap:new(erlang:max(W,30),erlang:max(30,H)), {Panel, #state{parent=Panel, config=Config, - canvas = Canvas, bitmap = Bitmap}}. + canvas = Canvas, bitmap = Bitmap, + overlay = wxOverlay:new() + }}. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %% Sync event from callback events, paint event must be handled in callbacks @@ -127,11 +135,39 @@ handle_event(#wx{event = #wxCommand{type = command_button_clicked}}, wxBitmap:destroy(Bmp), {noreply, State}; handle_event(#wx{event = #wxSize{size={W,H}}}, - State = #state{bitmap=Prev}) -> + State = #state{bitmap=Prev, canvas=Canvas}) -> Bitmap = wxBitmap:new(W,H), - draw(State#state.canvas, Bitmap, fun(DC) -> wxDC:clear(DC) end), + draw(Canvas, Bitmap, fun(DC) -> wxDC:clear(DC) end), wxBitmap:destroy(Prev), {noreply, State#state{bitmap = Bitmap}}; + +handle_event(#wx{event = #wxMouse{type=left_down, x=X, y=Y}}, State) -> + {noreply, State#state{pos={X,Y}}}; +handle_event(#wx{event = #wxMouse{type=motion, x=X1, y=Y1}}, + #state{pos=Start, overlay=Overlay, canvas=Canvas} = State) -> + case Start of + undefined -> ignore; + {X0,Y0} -> + DC = wxClientDC:new(Canvas), + DCO = wxDCOverlay:new(Overlay, DC), + wxDCOverlay:clear(DCO), + wxDC:setPen(DC, ?wxLIGHT_GREY_PEN), + wxDC:setBrush(DC, ?wxTRANSPARENT_BRUSH), + wxDC:drawRectangle(DC, {X0,Y0, X1-X0, Y1-Y0}), + wxDCOverlay:destroy(DCO), + wxClientDC:destroy(DC) + end, + {noreply, State}; +handle_event(#wx{event = #wxMouse{type=left_up}}, + #state{overlay=Overlay, canvas=Canvas} = State) -> + DC = wxClientDC:new(Canvas), + DCO = wxDCOverlay:new(Overlay, DC), + wxDCOverlay:clear(DCO), + wxDCOverlay:destroy(DCO), + wxClientDC:destroy(DC), + wxOverlay:reset(Overlay), + {noreply, State#state{pos=undefined}}; + handle_event(Ev = #wx{}, State = #state{}) -> demo:format(State#state.config, "Got Event ~p\n", [Ev]), {noreply, State}. @@ -155,7 +191,8 @@ handle_cast(Msg, State) -> code_change(_, _, State) -> {stop, ignore, State}. -terminate(_Reason, _) -> +terminate(_Reason, #state{overlay=Overlay}) -> + wxOverlay:destroy(Overlay), ok. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |