Update dependent values when a measurement is changed

I.e. when the weight is updated, update BMI as well.

android_app/app/src/main/java/com/health/openscale/gui/activities/DataEntryActivity.java

@@ -44,6 +44,7 @@ import com.health.openscale.gui.views.FatMeasurementView;
 import com.health.openscale.gui.views.HipMeasurementView;
 import com.health.openscale.gui.views.LBWMeasurementView;
 import com.health.openscale.gui.views.MeasurementView;
+import com.health.openscale.gui.views.MeasurementViewUpdateListener;
 import com.health.openscale.gui.views.MuscleMeasurementView;
 import com.health.openscale.gui.views.TimeMeasurementView;
 import com.health.openscale.gui.views.WHRMeasurementView;
@@ -172,6 +173,7 @@ public class DataEntryActivity extends Activity {
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
 
         for (MeasurementView measurement : dataEntryMeasurements) {
+            measurement.setOnUpdateListener(null);
             measurement.updatePreferences(prefs);
         }
 
@@ -214,13 +216,7 @@ public class DataEntryActivity extends Activity {
                 measurement.updateDiff(selectedScaleData, prevScaleData);
                 measurement.setExpand(doExpand);
             }
-
+        } else if (!OpenScale.getInstance(getApplicationContext()).getScaleDataList().isEmpty()) {
-            return;
-        }
-
-
-        if (!OpenScale.getInstance(getApplicationContext()).getScaleDataList().isEmpty())
-        {
             setViewMode(MeasurementView.MeasurementViewMode.ADD);
             txtDataNr.setText(DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.SHORT).format(new Date()));
             ScaleData lastScaleData = OpenScale.getInstance(getApplicationContext()).getScaleDataList().get(0);
@@ -239,6 +235,11 @@ public class DataEntryActivity extends Activity {
                 measurement.updateValue(newScaleData);
             }
         }
+
+        onMeasurementViewUpdateListener updateListener = new onMeasurementViewUpdateListener();
+        for (MeasurementView measurement : dataEntryMeasurements) {
+            measurement.setOnUpdateListener(updateListener);
+        }
     }
 
     private void setViewMode(MeasurementView.MeasurementViewMode viewMode)
@@ -352,6 +353,30 @@ public class DataEntryActivity extends Activity {
         return false;
     }
 
+    private class onMeasurementViewUpdateListener implements MeasurementViewUpdateListener {
+        @Override
+        public void onMeasurementViewUpdate(MeasurementView view) {
+            ArrayList<MeasurementView> viewsToUpdate = new ArrayList<>();
+            if (view == weightMeasurement) {
+                viewsToUpdate.add(bmiMeasurementView);
+                viewsToUpdate.add(bmrMeasurementView);
+            } else if (view == waistMeasurement) {
+                viewsToUpdate.add(wHtRMeasurementView);
+                viewsToUpdate.add(whrMeasurementView);
+            } else if (view == hipMeasurement) {
+                viewsToUpdate.add(whrMeasurementView);
+            } else if (view == dateMeasurement) {
+                viewsToUpdate.add(bmrMeasurementView);
+            }
+
+            if (!viewsToUpdate.isEmpty()) {
+                ScaleData scaleData = createScaleDataFromMeasurement();
+                for (MeasurementView measurement : viewsToUpdate) {
+                    measurement.updateValue(scaleData);
+                }
+            }
+        }
+    }
 
     private class onClickListenerAdd implements View.OnClickListener {
         @Override

android_app/app/src/main/java/com/health/openscale/gui/views/MeasurementView.java

@@ -80,6 +80,7 @@ public abstract class MeasurementView extends TableLayout {
     private float previousValue;
     private String diffValue;
 
+    private MeasurementViewUpdateListener updateListener = null;
     private MeasurementViewMode measurementMode;
 
     public MeasurementView(Context context, String text, Drawable icon) {
@@ -203,6 +204,10 @@ public abstract class MeasurementView extends TableLayout {
         evaluatorRow.setOnClickListener(onClickListener);
     }
 
+    public void setOnUpdateListener(MeasurementViewUpdateListener listener) {
+        updateListener = listener;
+    }
+
     public abstract void updateValue(ScaleData updateData);
     public abstract void updateDiff(ScaleData updateData, ScaleData lastData);
     public abstract void updatePreferences(SharedPreferences preferences);
@@ -302,6 +307,9 @@ public abstract class MeasurementView extends TableLayout {
         } catch (NumberFormatException e) {
             valueView.setText(value);
         }
+        if (updateListener != null) {
+            updateListener.onMeasurementViewUpdate(this);
+        }
     }
 
     protected void setDiffOnView(float value, float prevValue) {

android_app/app/src/main/java/com/health/openscale/gui/views/MeasurementViewUpdateListener.java

@@ -0,0 +1,20 @@
+/* Copyright (C) 2017 Erik Johansson <erik@ejohansson.se>
+*
+*    This program is free software: you can redistribute it and/or modify
+*    it under the terms of the GNU General Public License as published by
+*    the Free Software Foundation, either version 3 of the License, or
+*    (at your option) any later version.
+*
+*    This program is distributed in the hope that it will be useful,
+*    but WITHOUT ANY WARRANTY; without even the implied warranty of
+*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*    GNU General Public License for more details.
+*
+*    You should have received a copy of the GNU General Public License
+*    along with this program.  If not, see <http://www.gnu.org/licenses/>
+*/
+package com.health.openscale.gui.views;
+
+public interface MeasurementViewUpdateListener {
+    public void onMeasurementViewUpdate(MeasurementView view);
+}