mirror of https://github.com/sojamo/controlp5
135 lines
3.4 KiB
Java
Executable File
135 lines
3.4 KiB
Java
Executable File
package controlP5;
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/**
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* controlP5 is a processing gui library.
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*
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* 2006-2015 by Andreas Schlegel
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1
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* of the License, or (at your option) any later version.
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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* @author Andreas Schlegel (http://www.sojamo.de)
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* @modified ##date##
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* @version ##version##
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*
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*/
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import java.lang.reflect.Field;
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/**
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* the FieldChangedListener is used to observe changes of variables that are
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* linked to a controller. The FieldChangedListener is for primarily for
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* internal use.
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*
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* @see controlP5.Controller#listen(boolean)
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*/
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class FieldChangedListener {
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private FieldValue value;
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private ControlP5 controlP5;
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public FieldChangedListener(ControlP5 theControlP5) {
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controlP5 = theControlP5;
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}
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/**
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* Assigns a listener to a specific field of an object.
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*
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* this can be done in a more elegant way using generics.
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*
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* @param theObject
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* @param theFieldName
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*/
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public void listenTo(final Object theObject, final String theFieldName) {
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try {
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Class<?> c = theObject.getClass();
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final Field field = c.getDeclaredField(theFieldName);
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field.setAccessible(true);
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if (field.getType().isAssignableFrom(Float.TYPE)) {
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value = new FieldValue() {
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float then;
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public void check() {
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try {
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float now = (Float) field.get(theObject);
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if (now != then) {
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controlP5.getController(theFieldName, theObject).setValue(now);
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then = now;
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}
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} catch (IllegalAccessException e) {
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}
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}
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};
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} else if (field.getType().isAssignableFrom(Integer.TYPE)) {
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value = new FieldValue() {
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int then;
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public void check() {
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try {
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int now = (Integer) field.get(theObject);
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if (now != then) {
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controlP5.getController(theFieldName, theObject).setValue(now);
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then = now;
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}
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} catch (IllegalAccessException e) {
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}
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}
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};
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} else if (field.getType().isAssignableFrom(Boolean.TYPE)) {
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value = new FieldValue() {
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boolean then;
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public void check() {
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try {
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boolean now = (Boolean) field.get(theObject);
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if (now != then) {
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controlP5.getController(theFieldName, theObject).setValue(now == true ? 1 : 0);
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then = now;
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}
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} catch (IllegalAccessException e) {
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}
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}
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};
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} else if (field.getType().isAssignableFrom(String.class)) {
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value = new FieldValue() {
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String then;
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public void check() {
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try {
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String now = (String) field.get(theObject);
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if (!now.equals(then)) {
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controlP5.getController(theFieldName, theObject).setStringValue(now);
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then = now;
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}
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} catch (IllegalAccessException e) {
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}
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}
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};
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}
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} catch (Exception e) {
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System.out.println(e);
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}
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}
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void update() {
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value.check();
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}
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}
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interface FieldValue {
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public void check();
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}
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