source: java/main/src/main/java/com/framsticks/gui/components/ValueControl.java @ 77

package com.framsticks.gui.components;

import com.framsticks.params.CastFailure;
import com.framsticks.params.Flags;
import com.framsticks.params.types.ValueParam;

import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;

/**
 * @author Piotr Sniegowski
 */
public abstract class ValueControl extends Control {

        protected ValueControlListener listener;

        public ValueControl(ValueParam valueParamEntry) {
                super(valueParamEntry);
        }

        protected abstract void setValueImpl(Object value);

        /** I consider this an ugly solution, but I was unable to find proper
         * action listeners for underlying swing controls, that would only fire
         * on user change and on programmatic change.
         */
        protected boolean programmaticChange = false;

        public void setValue(Object value) {
                programmaticChange = true;
                setValueImpl(value);
                programmaticChange = false;
        }

        public abstract Object getValue();

        public void setListener(ValueControlListener listener) {
                this.listener = listener;
        }

        protected boolean notifyOfChange() {
                Object c = getValue();
                try {
                        Object v = param.reassign(c, null);
                        if (!programmaticChange) {
                                return listener == null || listener.onChange(v);
                        }
                        return true;
                } catch (CastFailure castFailure) {
                        return false;
                }
        }

        public boolean isReadOnly() {
                return (param.getFlags() & Flags.READONLY) != 0;
        }

    @Override
    public ValueParam getParam() {
        assert param instanceof ValueParam;
        return (ValueParam)param;
    }

        protected static DocumentListener createDocumentListener(final ValueControl component) {
                return new DocumentListener() {
                        @Override
                        public void insertUpdate(DocumentEvent documentEvent) {
                                component.notifyOfChange();
                        }

                        @Override
                        public void removeUpdate(DocumentEvent documentEvent) {
                                component.notifyOfChange();
                        }

                        @Override
                        public void changedUpdate(DocumentEvent documentEvent) {
                                component.notifyOfChange();
                        }
                };
        }

}