Here's the beginning of a JavaScriptCore binding (only the necessary
functions to call a Vala callback from JavaScript).
However, it's not perfect. There is some C compiler warning when compiling
'demo.vala'. I have not found a way to suppress it.
Best regards
Frederik
/*
* Compile with
* $ valac demo.vala --pkg webkit-1.0 --pkg jscore --vapidir .
*/
using Gtk;
using WebKit;
namespace WebKit {
/* Not bound in webkit-1.0.vapi */
public extern static unowned JS.Context web_frame_get_global_context (WebFrame frame);
}
/**
* Registers a JavaScript function to a WebView
*/
void register_js_function (WebView webview, string name, JS.Callback callback) {
var frame = webview.get_main_frame ();
unowned JS.Context ctx = web_frame_get_global_context (frame);
unowned JS.Object global = ctx.get_global_object ();
unowned JS.Object func = ctx.make_function_with_callback (null, callback);
ctx.set_property (global, new JS.String (name), func);
}
JS.Value? say_hello_callback () {
stdout.printf ("hello, world\n");
return null;
}
JS.Value? say_goodbye_callback () {
stdout.printf ("bye\n");
return null;
}
void main (string[] args) {
Gtk.init (ref args);
var window = new Window ();
window.destroy.connect (Gtk.main_quit);
var webview = new WebView ();
register_js_function (webview, "sayHello", say_hello_callback);
register_js_function (webview, "sayGoodbye", say_goodbye_callback);
webview.open ("file://./demo.html");
window.add (webview);
window.show_all ();
Gtk.main ();
}
[CCode (lower_case_cprefix = "JS", cheader_filename = "JavaScriptCore/JavaScript.h")]
namespace JS {
[CCode (cname = "JSObjectCallAsFunctionCallback", has_target = false)]
public delegate JS.Value? Callback (JS.Context context, JS.Object function, JS.Object this_object, [CCode (array_length_pos = 3.9, array_length_type = "size_t")] JS.Value[] arguments, out JS.Value exception);
[Compact]
[CCode (cname = "struct OpaqueJSContext")]
public class Context {
[CCode (cname = "JSContextGetGlobalObject")]
public unowned JS.Object get_global_object ();
[CCode (cname = "JSObjectMakeFunctionWithCallback")]
public unowned JS.Object make_function_with_callback (JS.String? name, JS.Callback call_as_function);
[CCode (cname = "JSObjectSetProperty")]
public void set_property (JS.Object object, JS.String property_name, JS.Value value, uint attributes = 0, out JS.Value exception = null);
}
[Compact]
[CCode (cname = "struct OpaqueJSValue")]
public class Value {
}
[Compact]
[CCode (cname = "struct OpaqueJSValue")]
public class Object : JS.Value {
}
[Compact]
[CCode (cname = "struct OpaqueJSString", free_function = "JSStringRelease")]
public class String {
[CCode (cname = "JSStringCreateWithUTF8CString")]
public String (string utf8_cstring);
}
}
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