Allow OSX WindowBuilder to specify 'activation behavior'.

[frewsxcv]

No description provided.

[frewsxcv]

Had to bump cocoa for servo/cocoa-rs#122. Needed the activation policy enum to implement Copy.

[tomaka]

Thanks.

The NSApplicationActivationPolicyRegular type shouldn't be public, or we will need to bump glutin whenever cocoa gets bumped. It should either be a custom enum, or maybe just a bool.

[tomaka]

Also platform_specific shouldn't be public in WindowBuilder, or the user could just write builder.platform_specific.activation_policy = ... and then wonder why it doesn't work on other platforms.

The fact that it has to go through a platform-specific trait makes it explicit that it's platform-specific. Ideally the WindowBuilderExt trait should directly expose members if rust-lang/rfcs#1546 gets merged.

[frewsxcv]

Result of removing the pub field:

coreyf@frewbook-pro ~/D/r/glutin (activation-policy)> cargo build
   Compiling glutin v0.5.1 (file:///Users/coreyf/Development/rust/glutin)
src/os/macos.rs:33:9: 33:31 error: field `platform_specific` of struct `window::WindowBuilder` is private
src/os/macos.rs:33         self.platform_specific.activation_policy = activation_policy;
                           ^~~~~~~~~~~~~~~~~~~~~~
error: aborting due to previous error
error: Could not compile `glutin`.

To learn more, run the command again with --verbose.

[frewsxcv]

The NSApplicationActivationPolicyRegular type shouldn't be public, or we will need to bump glutin whenever cocoa gets bumped. It should either be a custom enum, or maybe just a bool.

Force pushed with these changes.

[frewsxcv]

IRC:

10:28 AM <tomaka> frewsxcv: ah, my bad
10:28 AM <tomaka> frewsxcv: the solution is to mvoe WindowBuilder to lib.rs

Done.