android: Add a linear layout that is checkable

diff --git a/src/frontends/android/app/src/main/java/org/strongswan/android/ui/widget/CheckableLinearLayout.java b/src/frontends/android/app/src/main/java/org/strongswan/android/ui/widget/CheckableLinearLayout.java
new file mode 100644 (file)
index 0000000..fb5e85b
--- /dev/null
+++ b/src/frontends/android/app/src/main/java/org/strongswan/android/ui/widget/CheckableLinearLayout.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2017 Tobias Brunner
+ * HSR Hochschule fuer Technik Rapperswil
+ *
+ * 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 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * 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.
+ */
+
+package org.strongswan.android.ui.widget;
+
+import android.content.Context;
+import android.support.annotation.Nullable;
+import android.util.AttributeSet;
+import android.widget.Checkable;
+import android.widget.LinearLayout;
+
+public class CheckableLinearLayout extends LinearLayout implements Checkable
+{
+       private static final int[] CHECKED_STATE_SET = {android.R.attr.state_checked};
+       private boolean mChecked;
+
+       public CheckableLinearLayout(Context context, @Nullable AttributeSet attrs)
+       {
+               super(context, attrs);
+       }
+
+       @Override
+       public void setChecked(boolean checked)
+       {
+               if (mChecked != checked)
+               {
+                       mChecked = checked;
+                       refreshDrawableState();
+               }
+       }
+
+       @Override
+       public boolean isChecked()
+       {
+               return mChecked;
+       }
+
+       @Override
+       public void toggle()
+       {
+               setChecked(!mChecked);
+       }
+
+       @Override
+       protected int[] onCreateDrawableState(int extraSpace)
+       {
+               final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
+               if (isChecked())
+               {
+                       mergeDrawableStates(drawableState, CHECKED_STATE_SET);
+               }
+               return drawableState;
+       }
+}