altosuilib: Make map cache size configurable

Systems with sufficient memory can get smoother map scrolling by
making the cache larger. Would be nice to do this automatically?

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/altosuilib/AltosUIPreferences.java b/altosuilib/AltosUIPreferences.java
index 509faaff..ecab20d4 100644
--- a/altosuilib/AltosUIPreferences.java
+++ b/altosuilib/AltosUIPreferences.java
@@ -34,6 +34,9 @@ public class AltosUIPreferences extends AltosPreferences {
 	/* Window position preference name */
 	final static String positionPreference = "POSITION";
 
+	/* Maps cache size preference name */
+	final static String mapCachePreference = "MAP-CACHE";
+
 	/* UI Component to pop dialogs up */
 	static Component component;
 
@@ -52,6 +55,10 @@ public class AltosUIPreferences extends AltosPreferences {
 
 	public static int position = AltosUILib.position_top_left;
 
+	static LinkedList<AltosUIMapCacheListener> map_cache_listeners;
+
+	public static int map_cache = 9;
+
 	public static void init() {
 		AltosPreferences.init(new AltosUIPreferencesBackend());
 
@@ -68,6 +75,9 @@ public class AltosUIPreferences extends AltosPreferences {
 
 		position = backend.getInt(positionPreference, AltosUILib.position_top_left);
 		position_listeners = new LinkedList<AltosPositionListener>();
+
+		map_cache = backend.getInt(mapCachePreference, 9);
+		map_cache_listeners = new LinkedList<AltosUIMapCacheListener>();
 	}
 
 	static { init(); }
@@ -215,4 +225,32 @@ public class AltosUIPreferences extends AltosPreferences {
 			return position;
 		}
 	}
+
+	public static void register_map_cache_listener(AltosUIMapCacheListener l) {
+		synchronized(backend) {
+			map_cache_listeners.add(l);
+		}
+	}
+
+	public static void unregister_map_cache_listener(AltosUIMapCacheListener l) {
+		synchronized (backend) {
+			map_cache_listeners.remove(l);
+		}
+	}
+
+	public static void set_map_cache(int new_map_cache) {
+		synchronized(backend) {
+			map_cache = new_map_cache;
+			backend.putInt(mapCachePreference, map_cache);
+			flush_preferences();
+			for (AltosUIMapCacheListener l: map_cache_listeners)
+				l.map_cache_changed(map_cache);
+		}
+	}
+
+	public static int map_cache() {
+		synchronized(backend) {
+			return map_cache;
+		}
+	}
 }