Add custom extra keys preference

This is a new section in the extra keys option that allows to enter
arbitrary strings which are then added to the keyboard.

A new string is needed for the title of the section, Android's icons and
strings are used as much as possible to avoid adding more strings.

Keys are stored in the preferences as a JSON array of strings.

1 files changed, 174 insertions, 0 deletions

diff --git a/srcs/juloo.keyboard2/CustomExtraKeysPreference.java b/srcs/juloo.keyboard2/CustomExtraKeysPreference.java
new file mode 100644
index 0000000..228eae8
--- /dev/null
+++ b/srcs/juloo.keyboard2/CustomExtraKeysPreference.java
@@ -0,0 +1,174 @@
+package juloo.keyboard2;
+
+import android.app.AlertDialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.SharedPreferences;
+import android.preference.Preference;
+import android.preference.PreferenceCategory;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.EditText;
+import java.util.ArrayList;
+import java.util.List;
+import org.json.JSONArray;
+import org.json.JSONException;
+
+/** Allows to enter custom keys to be added to the keyboard. This shows up at
+    the top of the "Add keys to the keyboard" option. */
+public class CustomExtraKeysPreference extends PreferenceCategory
+{
+  /** This pref stores a list of strings encoded as JSON. */
+  static String KEY = "custom_extra_keys";
+
+  boolean _attached = false;
+  /** Mutable. This is the list of the key strings, not the key names. */
+  List<String> _keys;
+
+  public CustomExtraKeysPreference(Context context, AttributeSet attrs)
+  {
+    super(context, attrs);
+    setKey(KEY);
+    setOrderingAsAdded(true);
+    _keys = new ArrayList<String>();
+  }
+
+  public static List<KeyValue> get(SharedPreferences prefs)
+  {
+    List<KeyValue> kvs = new ArrayList<KeyValue>();
+    String inp = prefs.getString(KEY, null);
+    if (inp != null)
+      for (String key_name : load_from_string(inp))
+        kvs.add(KeyValue.makeStringKey(key_name));
+    return kvs;
+  }
+
+  @Override
+  protected void onSetInitialValue(boolean restoreValue, Object defaultValue)
+  {
+    if (restoreValue)
+    {
+      String persisted = getPersistedString(null);
+      if (persisted != null)
+        set_keys(load_from_string(persisted), false);
+    }
+    else if (defaultValue != null)
+      set_keys(load_from_string((String)defaultValue), false);
+  }
+
+  @Override
+  protected void onAttachedToActivity()
+  {
+    super.onAttachedToActivity();
+    if (_attached)
+      return;
+    _attached = true;
+    reattach();
+  }
+
+  void reattach()
+  {
+    removeAll();
+    for (String k : _keys)
+      addPreference(this.new CustomExtraKey(getContext(), k));
+    addPreference(this.new AddButton(getContext()));
+  }
+
+  void set_keys(List<String> v, boolean persist)
+  {
+    _keys = v;
+    reattach();
+    if (persist)
+      persistString(save_to_string(_keys));
+  }
+
+  void add_key(String k)
+  {
+    _keys.add(k);
+    set_keys(_keys, true);
+  }
+
+  void remove_key(String k)
+  {
+    _keys.remove(k);
+    set_keys(_keys, true);
+  }
+
+  static String save_to_string(List<String> keys)
+  {
+    return (new JSONArray(keys)).toString();
+  }
+
+  static List<String> load_from_string(String inp)
+  {
+    List<String> keys = new ArrayList<String>();
+    try
+    {
+      JSONArray arr = new JSONArray(inp);
+      for (int i = 0; i < arr.length(); i++)
+        keys.add(arr.getString(i));
+    }
+    catch (JSONException e) {}
+    return keys;
+  }
+
+  /** A preference with no key that is only intended to be rendered. */
+  final class CustomExtraKey extends Preference implements View.OnClickListener
+  {
+    String _key;
+
+    public CustomExtraKey(Context ctx, String key)
+    {
+      super(ctx);
+      _key = key;
+      setTitle(key);
+      setPersistent(false);
+      setWidgetLayoutResource(R.layout.custom_extra_key_widget);
+    }
+
+    /** Remove-button listener. */
+    @Override
+    public void onClick(View _v)
+    {
+      CustomExtraKeysPreference.this.remove_key(_key);
+    }
+
+    @Override
+    protected View onCreateView(ViewGroup parent)
+    {
+      View v = super.onCreateView(parent);
+      v.findViewById(R.id.btn_custom_extra_key_remove).setOnClickListener(this);
+      return v;
+    }
+  }
+
+  final class AddButton extends Preference
+  {
+    public AddButton(Context ctx)
+    {
+      super(ctx);
+      setPersistent(false);
+      setLayoutResource(R.layout.custom_extra_key_add);
+    }
+
+    @Override
+    protected void onClick()
+    {
+      new AlertDialog.Builder(getContext())
+        .setView(R.layout.custom_extra_key_add_dialog)
+        .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener(){
+          public void onClick(DialogInterface dialog, int which)
+          {
+            EditText input = (EditText)((AlertDialog)dialog).findViewById(R.id.key_name);
+            String k = input.getText().toString();
+            if (!k.equals(""))
+              CustomExtraKeysPreference.this.add_key(k);
+          }
+        })
+        .setNegativeButton(android.R.string.cancel, null)
+        .setIcon(android.R.drawable.ic_dialog_alert)
+        .show();
+    }
+  }
+}