package main.java.src2.main.java.controlP5.controlP5; /** * controlP5 is a processing gui library. * * 2006-2015 by Andreas Schlegel * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License * as published by the Free Software Foundation; either version 2.1 * of the License, or (at your option) any later version. * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General * Public License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307 USA * * @author Andreas Schlegel (http://www.sojamo.de) * @modified ##date## * @version ##version## * */ import java.lang.reflect.Field; /** * the FieldChangedListener is used to observe changes of variables that are * linked to a controller. The FieldChangedListener is for primarily for * internal use. * * @see Controller#listen(boolean) */ class FieldChangedListener { private FieldValue value; private final ControlP5 controlP5; public FieldChangedListener(ControlP5 theControlP5) { controlP5 = theControlP5; } /** * Assigns a listener to a specific field of an object. * * this can be done in a more elegant way using generics. * * @param theObject * @param theFieldName */ public void listenTo(final Object theObject, final String theFieldName) { try { Class c = theObject.getClass(); final Field field = c.getDeclaredField(theFieldName); field.setAccessible(true); if (field.getType().isAssignableFrom(Float.TYPE)) { value = new FieldValue() { float then; public void check() { try { float now = (Float) field.get(theObject); if (now != then) { controlP5.getController(theFieldName, theObject).setValue(now); then = now; } } catch (IllegalAccessException e) { } } }; } else if (field.getType().isAssignableFrom(Integer.TYPE)) { value = new FieldValue() { int then; public void check() { try { int now = (Integer) field.get(theObject); if (now != then) { controlP5.getController(theFieldName, theObject).setValue(now); then = now; } } catch (IllegalAccessException e) { } } }; } else if (field.getType().isAssignableFrom(Boolean.TYPE)) { value = new FieldValue() { boolean then; public void check() { try { boolean now = (Boolean) field.get(theObject); if (now != then) { controlP5.getController(theFieldName, theObject).setValue(now ? 1 : 0); then = now; } } catch (IllegalAccessException e) { } } }; } else if (field.getType().isAssignableFrom(String.class)) { value = new FieldValue() { String then; public void check() { try { String now = (String) field.get(theObject); if (!now.equals(then)) { controlP5.getController(theFieldName, theObject).setStringValue(now); then = now; } } catch (IllegalAccessException e) { } } }; } } catch (Exception e) { System.out.println(e); } } void update() { value.check(); } } interface FieldValue { void check(); }