[qwaq] Add a key event listener to Editor

This will allow for easy expansion of editor functionality without
messing with the editor itself. In particularly, an editor normally
doesn't need to know anything about debugger hot keys.

ruamoko/qwaq/qwaq-editor.h

@@ -4,7 +4,15 @@
 #include "qwaq-editbuffer.h"
 #include "qwaq-view.h"
 
+@class Editor;
 @class EditBuffer;
+@class ListenerGroup;
+
+// Data sent to onKeyEvent listeners
+typedef struct ed_event_s {
+	Editor     *editor;
+	struct qwaq_event_s *event;
+} ed_event_t;
 
 @interface Editor : View
 {
@@ -19,8 +27,11 @@
 	Point       cursor;
 	unsigned    line_count;
 	string      filename;
+	ListenerGroup *onEvent;
+	ed_event_t  _event;
 }
 -initWithRect:(Rect) rect file:(string) filename;
+-(ListenerGroup *)onEvent;
 -(string)filename;
 -scrollUp:(unsigned) count;
 -scrollDown:(unsigned) count;

ruamoko/qwaq/qwaq-editor.r

@@ -1,6 +1,7 @@
 #include <QF/keys.h>
 #include "color.h"
 #include "qwaq-editor.h"
+#include "qwaq-listener.h"
 
 @implementation Editor
 
@@ -15,9 +16,15 @@
 	linebuffer = [DrawBuffer buffer: { xlen, 1 }];
 	growMode = gfGrowHi;
 	options = ofCanFocus;
+	onEvent = [[ListenerGroup alloc] init];
 	return self;
 }
 
+-(ListenerGroup *)onEvent
+{
+	return onEvent;
+}
+
 -(string)filename
 {
 	return filename;
@@ -46,6 +53,10 @@
 
 -handleEvent:(qwaq_event_t *) event
 {
+	// give any listeners a chance to override or extend event handling
+	_event.editor = self;
+	_event.event = event;
+	[onEvent respond: &_event];
 	if (event.what & qe_mouse) {
 		if (event.what == qe_mouseclick) {
 			if (event.mouse.buttons & (1 << 3)) {