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WxErlang Mats-Ola Persson.

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Presentation on theme: "WxErlang Mats-Ola Persson."— Presentation transcript:

1 wxErlang Mats-Ola Persson

2 wxErlang GUI library for Erlang write GUI applications cross platform
cross platform look and feel

3 Example A “stupid” tic-tac-toe application
No intelligent behavior is implemented Just the (good) looks

4 Creating a window create_window() ->
wx:start(), % initialize wxErlang % create a frame (window) with no parent Frame = wx:frame(?NULL, ?wxID_ANY, “Hello World!”), wx:show(Frame). % make the frame visible

5 Creating a window Not very exciting: an empty window

6 Event-driven programming
Things “react” to mouse clicks, mouse movements, etc. Event-handlers, callback functions

7 Events create_window() -> wx:start(),
Frame = wx:frame(?NULL, ?wxID_ANY, “Hello World!”), % event-handler that reacts to close clicks wx:connect(Frame, ?wxEVT_CLOSE_WINDOW, fun(_,_) -> wx:quit() end), wx:show(Frame).

8 Layouts Platform independent layouts Sizers
No fixed sized widgets, etc. Arbitrary complex layouts Let’s add the buttons!

9 Sizers create_grid(Frame) -> Grid = wx:grid_sizer(3), % a grid sizer with 3 cols create_buttons(Grid, Frame, 9), % create 9 buttons Grid. create_buttons(_, _, 0) -> ok;create_buttons(Grid, Frame, N) -> Button = wx:button(Frame, N), %a button without label wx:add(Grid, Button), % add button to the sizer create_buttons(Grid, Frame, N - 1).

10 The result A “shell” of a tic-tac-toe application

11 wxEtop Port of the old “etop” New features context menues
view running code ...

12 From the programmers point of view
wxErlang is verbose - like most GUI libraries Trial-and-error - like most GUI libraries Interface designers XRCed, DialogBlocks, etc.

13 Design decisions Binding to the C++ GUI library wxWidgets
Get a lot for free “free” features from wxWidgets reduced maintenance work wxErlang interface resembles wxWidgets C++ interface free documentation(!) Varför wxWidgets?

14 Translation scheme Easy Functions Multiple return values => tuples
... Constants

15 Translation scheme Not as easy Classes
Overloading and overriding functions Type system

16 Safety Checks arguments Types Primitive values Objects Sanity

17 Implementational details
Most of the code is generated from wxWidgets headers Implemented as a “port program” Has a lot of bugs

18 Wrap up Current status - a prototyp wxEtop Perhaps 10% implemented

19 Questions?

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