From 0856fb4e31a98b7f14f50006d95c89e23c19503d Mon Sep 17 00:00:00 2001
From: Jules Aguillon
Date: Sat, 29 Jul 2023 18:31:26 +0200
Subject: Refactor: Split out ListGroupPreference

Split out the implementation of a string-list preference from
CustomExtraKeysPreference.

Allows to share the implementation with future preferences.
---
 srcs/juloo.keyboard2/ListGroupPreference.java | 193 ++++++++++++++++++++++++++
 1 file changed, 193 insertions(+)
 create mode 100644 srcs/juloo.keyboard2/ListGroupPreference.java

(limited to 'srcs/juloo.keyboard2/ListGroupPreference.java')

diff --git a/srcs/juloo.keyboard2/ListGroupPreference.java b/srcs/juloo.keyboard2/ListGroupPreference.java
new file mode 100644
index 0000000..b7f2259
--- /dev/null
+++ b/srcs/juloo.keyboard2/ListGroupPreference.java
@@ -0,0 +1,193 @@
+package juloo.keyboard2;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.preference.Preference;
+import android.preference.PreferenceGroup;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.ViewGroup;
+import java.util.ArrayList;
+import java.util.List;
+import org.json.JSONArray;
+import org.json.JSONException;
+
+/** A list of preferences where the users can add items to the end and modify
+    and remove items. Backed by a string list. Implement user selection in
+    [select()]. */
+public abstract class ListGroupPreference extends PreferenceGroup
+{
+  boolean _attached = false;
+  List<String> _values;
+
+  public ListGroupPreference(Context context, AttributeSet attrs)
+  {
+    super(context, attrs);
+    setOrderingAsAdded(true);
+    setLayoutResource(R.layout.pref_listgroup_group);
+    _values = new ArrayList<String>();
+  }
+
+  /** Overrideable */
+
+  /** The label to display on the item for a given value. */
+  String label_of_value(String value, int i)
+  {
+    return value;
+  }
+
+  /** Called when an item is added or modified. Returns [null] to cancel the
+      action. */
+  abstract void select(SelectionCallback callback);
+
+  /** Load/save utils */
+
+  /** Read a value saved by preference from a [SharedPreferences] object.
+      Returns [null] on error. */
+  static List<String> load_from_preferences(String key,
+      SharedPreferences prefs, List<String> def)
+  {
+    String s = prefs.getString(key, null);
+    return (s != null) ? load_from_string(s) : def;
+  }
+
+  /** Decode a list of string previously encoded with [save_to_string]. Returns
+      [null] on error. */
+  static List<String> load_from_string(String inp)
+  {
+    try
+    {
+      List<String> l = new ArrayList<String>();
+      JSONArray arr = new JSONArray(inp);
+      for (int i = 0; i < arr.length(); i++)
+        l.add(arr.getString(i));
+      return l;
+    }
+    catch (JSONException e)
+    {
+      return null;
+    }
+  }
+
+  /** Encode a list of string so it can be passed to
+      [Preference.persistString()]. Decode with [load_from_string]. */
+  static String save_to_string(List<String> l)
+  {
+    return (new JSONArray(l)).toString();
+  }
+
+  /** Protected API */
+
+  /** Set the values. If [persist] is [true], persist into the store. */
+  void set_values(List<String> vs, boolean persist)
+  {
+    _values = vs;
+    reattach();
+    if (persist)
+      persistString(save_to_string(vs));
+  }
+
+  void add_item(String v)
+  {
+    _values.add(v);
+    set_values(_values, true);
+  }
+
+  void remove_item(String v)
+  {
+    _values.remove(v);
+    set_values(_values, true);
+  }
+
+  /** Internal */
+
+  @Override
+  protected void onSetInitialValue(boolean restoreValue, Object defaultValue)
+  {
+    String input = (restoreValue) ? getPersistedString(null) : (String)defaultValue;
+    if (input != null)
+    {
+      List<String> values = load_from_string(input);
+      if (values != null)
+        set_values(values, false);
+    }
+  }
+
+  @Override
+  protected void onAttachedToActivity()
+  {
+    super.onAttachedToActivity();
+    if (_attached)
+      return;
+    _attached = true;
+    reattach();
+  }
+
+  void reattach()
+  {
+    removeAll();
+    int i = 0;
+    for (String v : _values)
+    {
+      Item item = this.new Item(getContext(), v);
+      item.setTitle(label_of_value(v, i));
+      addPreference(item);
+      i++;
+    }
+    addPreference(this.new AddButton(getContext()));
+  }
+
+  class Item extends Preference
+  {
+    final String _value;
+
+    public Item(Context ctx, String value)
+    {
+      super(ctx);
+      _value = value;
+      setPersistent(false);
+      setWidgetLayoutResource(R.layout.pref_listgroup_item_widget);
+    }
+
+    @Override
+    protected View onCreateView(ViewGroup parent)
+    {
+      View v = super.onCreateView(parent);
+      v.findViewById(R.id.pref_listgroup_remove_btn)
+        .setOnClickListener(new View.OnClickListener() {
+          @Override
+          public void onClick(View _v)
+          {
+            remove_item(_value);
+          }
+        });
+      return v;
+    }
+  }
+
+  final class AddButton extends Preference
+  {
+    public AddButton(Context ctx)
+    {
+      super(ctx);
+      setPersistent(false);
+      setLayoutResource(R.layout.pref_listgroup_add_btn);
+    }
+
+    @Override
+    protected void onClick()
+    {
+      select(new SelectionCallback() {
+        public void select(String value)
+        {
+          add_item(value);
+        }
+      });
+    }
+  }
+
+  public interface SelectionCallback
+  {
+    public void select(String value);
+  }
+}
-- 
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