[qwaq] Fix a bunch of issues with the scrollbar

Leaking memory. And worse, it wasn't drawing its buttons (group wasn't
setting view contexts) and then the buttons were in the wrong place, so
had to add a backing buffer for the buttons.

ruamoko/qwaq/ui/group.r

@@ -38,6 +38,8 @@
 -setContext: (id<TextContext>) context
 {
 	self.context = context;
+	[views makeObjectsPerformSelector:@selector(setContext:)
+						   withObject:context];
 	return self;
 }
 

ruamoko/qwaq/ui/scrollbar.h

@@ -4,6 +4,7 @@
 #include "ui/view.h"
 
 @class Button;
+@class DrawBuffer;
 @class Group;
 @class ListenerGroup;
 
@@ -12,6 +13,7 @@
 	int         vertical;
 	int         bgchar;
 	Point       mouseStart;
+	DrawBuffer *buffer;
 	Button     *backButton;
 	Button     *forwardButton;
 	Button     *thumbTab;

ruamoko/qwaq/ui/scrollbar.r

@@ -10,7 +10,8 @@
 	if (!(self = [super initWithRect:rect])) {
 		return nil;
 	}
-	objects = [[Group withContext:textContext owner:self] retain];
+	buffer = [[DrawBuffer buffer:size] retain];
+	objects = [[Group withContext:buffer owner:self] retain];
 	onScroll = [[ListenerGroup listener] retain];
 	vertical = xlen == 1;
 	DrawBuffer *icons[3] = {
@@ -55,6 +56,13 @@
 	return self;
 }
 
+-(void)dealloc
+{
+	[objects release];
+	[buffer release];
+	[onScroll release];
+}
+
 +(ScrollBar *)horizontal:(unsigned)len at:(Point)pos
 {
 	if (len == 1) {
@@ -78,6 +86,7 @@
 
 -draw
 {
+	syncprintf("scrollbar start");
 	if (vertical) {
 		[self mvvline:pos, bgchar, ylen];
 	} else {
@@ -85,6 +94,8 @@
 	}
 	[super draw];
 	[objects draw];
+	[textContext blitFromBuffer:buffer to:pos from:[buffer rect]];
+	syncprintf("scrollbar end");
 	return self;
 }