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-rw-r--r--lib/wx/examples/demo/ex_canvas.erl13
-rw-r--r--lib/wx/examples/demo/ex_canvas_paint.erl16
2 files changed, 18 insertions, 11 deletions
diff --git a/lib/wx/examples/demo/ex_canvas.erl b/lib/wx/examples/demo/ex_canvas.erl
index 2a95ea0777..b00ce81993 100644
--- a/lib/wx/examples/demo/ex_canvas.erl
+++ b/lib/wx/examples/demo/ex_canvas.erl
@@ -136,11 +136,14 @@ handle_event(#wx{event = #wxCommand{type = command_button_clicked}},
{noreply, State};
handle_event(#wx{event = #wxSize{size={W,H}}},
State = #state{bitmap=Prev, canvas=Canvas}) ->
- Bitmap = wxBitmap:new(W,H),
- draw(Canvas, Bitmap, fun(DC) -> wxDC:clear(DC) end),
- wxBitmap:destroy(Prev),
- {noreply, State#state{bitmap = Bitmap}};
-
+ if W > 0 andalso H > 0 ->
+ Bitmap = wxBitmap:new(W,H),
+ draw(Canvas, Bitmap, fun(DC) -> wxDC:clear(DC) end),
+ wxBitmap:destroy(Prev),
+ {noreply, State#state{bitmap = Bitmap}};
+ true ->
+ {noreply, State}
+ end;
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}},
diff --git a/lib/wx/examples/demo/ex_canvas_paint.erl b/lib/wx/examples/demo/ex_canvas_paint.erl
index aa510f5342..75eb840b04 100644
--- a/lib/wx/examples/demo/ex_canvas_paint.erl
+++ b/lib/wx/examples/demo/ex_canvas_paint.erl
@@ -157,10 +157,15 @@ handle_event(#wx{event = #wxMouse{type = motion, x = X, y = Y}},
{noreply, State#state{old_pos = {X,Y}}};
%% Resize event
handle_event(#wx{event = #wxSize{size = {W,H}}}, State = #state{bitmap=Prev}) ->
- wxBitmap:destroy(Prev),
- Bitmap = wxBitmap:new(W,H),
- draw(State#state.canvas, Bitmap, fun(DC) -> wxDC:clear(DC) end),
- {noreply, State#state{bitmap=Bitmap}};
+ case W > 0 andalso H > 0 of
+ true ->
+ wxBitmap:destroy(Prev),
+ Bitmap = wxBitmap:new(W,H),
+ draw(State#state.canvas, Bitmap, fun(DC) -> wxDC:clear(DC) end),
+ {noreply, State#state{bitmap=Bitmap}};
+ false ->
+ {noreply, State}
+ end;
handle_event(#wx{event = #wxMouse{type = left_dclick,x = X,y = Y}}, State = #state{}) ->
wxPanel:connect(State#state.canvas, motion),
{noreply, State#state{old_pos = {X,Y}}};
@@ -235,11 +240,10 @@ draw(Canvas, Bitmap, Fun) ->
CDC = wxClientDC:new(Canvas),
Fun(MemoryDC),
-
wxDC:blit(CDC, {0,0},
{wxBitmap:getWidth(Bitmap), wxBitmap:getHeight(Bitmap)},
MemoryDC, {0,0}),
-
+
wxClientDC:destroy(CDC),
wxMemoryDC:destroy(MemoryDC).