altosui: Use persistent list of bluetooth devices for device dialogs

Store a list of known bluetooth devices as preferences. Always include
those in device dialogs with an option to go browse for more devices
in both the device dialog and the Configure AltosUI dialog.

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

1 files changed, 18 insertions, 7 deletions

diff --git a/altosui/AltosPreferences.java b/altosui/AltosPreferences.java
index 5f827655..b1192be1 100644
--- a/altosui/AltosPreferences.java
+++ b/altosui/AltosPreferences.java
@@ -79,11 +79,9 @@ class AltosPreferences {
 	/* Serial debug */
 	static boolean serial_debug;
 
-	public static void init(Component ui) {
+	public static void init() {
 		preferences = Preferences.userRoot().node("/org/altusmetrum/altosui");
 
-		component = ui;
-
 		/* Initialize logdir from preferences */
 		String logdir_string = preferences.get(logdirPreference, null);
 		if (logdir_string != null)
@@ -116,14 +114,23 @@ class AltosPreferences {
 		AltosSerial.set_debug(serial_debug);
 	}
 
+	static { init(); }
+
+	static void set_component(Component in_component) {
+		component = in_component;
+	}
+
 	static void flush_preferences() {
 		try {
 			preferences.flush();
 		} catch (BackingStoreException ee) {
-			JOptionPane.showMessageDialog(component,
-						      preferences.absolutePath(),
-						      "Cannot save prefernces",
-						      JOptionPane.ERROR_MESSAGE);
+			if (component != null)
+				JOptionPane.showMessageDialog(component,
+							      preferences.absolutePath(),
+							      "Cannot save prefernces",
+							      JOptionPane.ERROR_MESSAGE);
+			else
+				System.err.printf("Cannot save preferences\n");
 		}
 	}
 
@@ -262,4 +269,8 @@ class AltosPreferences {
 	public static boolean serial_debug() {
 		return serial_debug;
 	}
+
+	public static Preferences bt_devices() {
+		return preferences.node("bt_devices");
+	}
 }