altosdroid: Skip updating hidden UI elements

[fw/altos] / altosdroid / src / org / altusmetrum / AltosDroid / AltosDroidTab.java

diff --git a/altosdroid/src/org/altusmetrum/AltosDroid/AltosDroidTab.java b/altosdroid/src/org/altusmetrum/AltosDroid/AltosDroidTab.java
index 20593bd550996d4467ea0e45d36fd723d0cff5d8..b960eb1a2a7d5c5e81f93e75d3640e049bace381 100644 (file)
--- a/altosdroid/src/org/altusmetrum/AltosDroid/AltosDroidTab.java
+++ b/altosdroid/src/org/altusmetrum/AltosDroid/AltosDroidTab.java
@@ -19,7 +19,57 @@ package org.altusmetrum.AltosDroid;
 
 import org.altusmetrum.altoslib_5.*;
 import android.location.Location;
+import android.app.Activity;
+import android.graphics.Color;
+import android.os.Bundle;
+import android.support.v4.app.Fragment;
+import android.support.v4.app.FragmentTransaction;
+import android.support.v4.app.FragmentManager;
+import android.location.Location;
+import android.util.Log;
+
+public abstract class AltosDroidTab extends Fragment {
+       AltosState              last_state;
+       AltosGreatCircle        last_from_receiver;
+       Location                last_receiver;
+
+       public abstract void show(AltosState state, AltosGreatCircle from_receiver, Location receiver);
+
+       public abstract String tab_name();
+
+       public void set_visible(boolean visible) {
+               FragmentTransaction     ft = AltosDroid.fm.beginTransaction();
+               if (visible)
+                       ft.show(this);
+               else
+                       ft.hide(this);
+               ft.commit();
+       }
+
+       public void update_ui(AltosState state, AltosGreatCircle from_receiver, Location receiver, boolean is_current) {
+               if (is_current) {
+                       Log.d(AltosDroid.TAG, String.format("%s: visible, performing update", tab_name()));
+
+                       show(state, from_receiver, receiver);
+               } else {
+                       Log.d(AltosDroid.TAG, String.format("%s: not visible, skipping update", tab_name()));
+                       last_state = state;
+                       last_from_receiver = from_receiver;
+                       last_receiver = receiver;
+                       return;
+               }
+       }
+
+       public void onHiddenChanged(boolean hidden) {
+               if (last_state != null && isVisible()) {
+                       AltosState              state = last_state;
+                       AltosGreatCircle        from_receiver = last_from_receiver;
+                       Location                receiver = last_receiver;
 
-public interface AltosDroidTab {
-       public void update_ui(AltosState state, AltosGreatCircle from_receiver, Location receiver);
+                       last_state = null;
+                       last_from_receiver = null;
+                       last_receiver = null;
+                       show(state, from_receiver, receiver);
+               }
+       }
 }