Issue 4769 - Supporting adding whitelisted websites on ABP for Samsung Internet

src/org/adblockplus/sbrowser/contentblocker/UrlInputOpenerPreference.java

Index: src/org/adblockplus/sbrowser/contentblocker/UrlInputOpenerPreference.java
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new file mode 100644
--- /dev/null
+++ b/src/org/adblockplus/sbrowser/contentblocker/UrlInputOpenerPreference.java
@@ -0,0 +1,166 @@
+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-2016 Eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus 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 Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.adblockplus.sbrowser.contentblocker;
+
+import android.app.AlertDialog;
+import android.content.Context;
+import android.graphics.drawable.Drawable;
+import android.os.Build;
+import android.os.Bundle;
+import android.preference.EditTextPreference;
+import android.support.annotation.DrawableRes;
+import android.support.v4.content.ContextCompat;
+import android.text.Editable;
+import android.text.InputType;
+import android.text.TextWatcher;
+import android.util.AttributeSet;
+import android.util.Patterns;
+import android.view.KeyEvent;
+import android.view.inputmethod.EditorInfo;
+import android.widget.EditText;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import org.adblockplus.adblockplussbrowser.R;
+
+public class UrlInputOpenerPreference extends EditTextPreference implements TextWatcher,
+    TextView.OnEditorActionListener
+{
+
+  private OnUrlReadyListener onUrlReadyListener;
+  private AlertDialog mAlertDialog;
+
+  public UrlInputOpenerPreference(Context context)
+  {
+    this(context, null);
+  }
+
+  public UrlInputOpenerPreference(Context context, AttributeSet attrs)
+  {
+    super(context, attrs);
+
+    // Setting defaults
+    this.setIcon(android.R.drawable.ic_menu_add);
+    this.setPositiveButtonText(android.R.string.ok);
+    this.setNegativeButtonText(android.R.string.cancel);
+    final EditText editText = getEditText();
+    editText.addTextChangedListener(this);
+    editText.setOnEditorActionListener(this);
+    editText.setInputType(InputType.TYPE_TEXT_VARIATION_URI);
+  }
+
+  @Override
+  protected void showDialog(Bundle state)
+  {
+    super.showDialog(state);
+
+    mAlertDialog = (AlertDialog) getDialog();
+    // Positive button is disabled until a valid URL is entered
+    this.setPositiveButtonEnabled(false);
+  }
+
+  @Override
+  protected void onDialogClosed(boolean positiveResult)
+  {
+    super.onDialogClosed(positiveResult);
+
+    mAlertDialog = null;
+    if (positiveResult && this.onUrlReadyListener != null)
+    {
+      this.onUrlReadyListener.onUrlReady(getUrl());
+    }
+  }
+
+  @Override
+  public void beforeTextChanged(CharSequence s, int start, int count, int after)
+  {
+    // Ignored
+  }
+
+  @Override
+  public void onTextChanged(CharSequence s, int start, int before, int count)
+  {
+    // Ignored
+  }
+
+  @Override
+  public void afterTextChanged(Editable s)
+  {
+    setPositiveButtonEnabled(isValidUrl());
+  }
+
+  @Override
+  public boolean onEditorAction(TextView v, int actionId, KeyEvent event)
+  {
+    if (actionId == EditorInfo.IME_ACTION_DONE)
+    {
+      if (this.isValidUrl())
+      {
+        mAlertDialog.getButton(AlertDialog.BUTTON_POSITIVE).performClick();
+      }
+      else
+      {
+        Toast.makeText(getContext(), R.string.whitelist_website_invalid_url_error, Toast.LENGTH_SHORT).show();
+      }
+      return true;
+    }
+    return false;
+  }
+
+  public void setIcon(@DrawableRes int iconResId)
+  {
+    final Drawable drawable = ContextCompat.getDrawable(getContext(), iconResId);
+    setIcon(drawable);
+  }
+
+  public void setIcon(Drawable icon)
+  {
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
+    {
+      super.setIcon(android.R.drawable.ic_menu_add);
+    }
+  }
+
+  public void setOnUrlReadyListener(OnUrlReadyListener listener)
+  {
+    this.onUrlReadyListener = listener;
+  }
+
+  private boolean isValidUrl()
+  {
+    return Patterns.WEB_URL.matcher(getUrl()).matches();
+  }
+
+  private String getUrl()
+  {
+    return getEditText().getText().toString();
+  }
+
+  private void setPositiveButtonEnabled(boolean enabled)
+  {
+    if (mAlertDialog != null)
+    {
+      mAlertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(enabled);
+    }
+  }
+
+  public interface OnUrlReadyListener
+  {
+    void onUrlReady(String url);
+  }
+}