Added special ScrollView with auto-scrolling feature

The ability to auto-scroll is disabled as soon as the user manually scrolls around and re-enable when the user scrolls to the bottom.
2012-08-13 11:22:20 +02:00
parent fe05f1f05c
commit 658ed96fce
1 changed files with 78 additions and 0 deletions
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2012 Tobias Brunner
+ * Copyright (C) 2012 Giuliano Grassi
+ * Copyright (C) 2012 Ralf Sager
+ * 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;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.view.View;
+import android.widget.ScrollView;
+
+public class LogScrollView extends ScrollView
+{
+	private boolean mAutoScroll = true;
+
+	public LogScrollView(Context context)
+	{
+		super(context);
+	}
+
+	public LogScrollView(Context context, AttributeSet attrs)
+	{
+		super(context, attrs);
+	}
+
+	public LogScrollView(Context context, AttributeSet attrs, int defStyle)
+	{
+		super(context, attrs, defStyle);
+	}
+
+	@Override
+	public boolean onTouchEvent(MotionEvent ev)
+	{
+		/* disable auto-scrolling when the user starts scrolling around */
+		if (ev.getActionMasked() == MotionEvent.ACTION_DOWN)
+		{
+			mAutoScroll = false;
+		}
+		return super.onTouchEvent(ev);
+	}
+
+	/**
+	 * Call this to move newly added content into view by scrolling to the bottom.
+	 * Nothing happens if auto-scrolling is disabled.
+	 */
+	public void autoScroll()
+	{
+		if (mAutoScroll)
+		{
+			fullScroll(View.FOCUS_DOWN);
+		}
+	}
+
+	@Override
+	protected void onScrollChanged(int l, int t, int oldl, int oldt)
+	{
+		super.onScrollChanged(l, t, oldl, oldt);
+		/* if the user scrolls to the bottom we enable auto-scrolling again */
+		if (t == getChildAt(getChildCount() - 1).getHeight() - getHeight())
+		{
+			mAutoScroll = true;
+		}
+	}
+}