/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.pdfbox.examples.interactive.form;

import java.io.File;
import java.io.IOException;

import org.apache.pdfbox.Loader;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.interactive.action.PDActionJavaScript;
import org.apache.pdfbox.pdmodel.interactive.action.PDAnnotationAdditionalActions;
import org.apache.pdfbox.pdmodel.interactive.action.PDFormFieldAdditionalActions;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationWidget;
import org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm;
import org.apache.pdfbox.pdmodel.interactive.form.PDField;

/**
 * Show usage of different field triggers.
 * 
 * This sample adds a JavaScript to be executed on the different field triggers available.
 * 
 * This sample builds on the form generated by @link CreateSimpleForm so you need to run that first.
 * 
 */
public final class FieldTriggers
{
    private FieldTriggers()
    {
    }
    
    public static void main(String[] args) throws IOException
    {
        // Load the PDF document created by SimpleForm.java
        try (PDDocument document = Loader.loadPDF(new File("target/SimpleForm.pdf")))
        {
            PDAcroForm acroForm = document.getDocumentCatalog().getAcroForm();
            
            // Get the field and the widget associated to it.
            // Note: there might be multiple widgets
            PDField field = acroForm.getField("SampleField");
            PDAnnotationWidget widget = field.getWidgets().get(0);
            
            // Some of the actions are available to the widget, some are available to the form field.
            // See Table 8.44 and Table 8.46 in the PDF 1.7 specification
            
            // Actions for the widget
            PDAnnotationAdditionalActions annotationActions = new PDAnnotationAdditionalActions();
            
            // Create an action when entering the annotations active area
            PDActionJavaScript jsEnterAction = new PDActionJavaScript();
            jsEnterAction.setAction("app.alert(\"On 'enter' action\")");
            annotationActions.setE(jsEnterAction);
            
            // Create an action when exiting the annotations active area
            PDActionJavaScript jsExitAction = new PDActionJavaScript();
            jsExitAction.setAction("app.alert(\"On 'exit' action\")");
            annotationActions.setX(jsExitAction);
            
            // Create an action when the mouse button is pressed inside the annotations active area
            PDActionJavaScript jsMouseDownAction = new PDActionJavaScript();
            jsMouseDownAction.setAction("app.alert(\"On 'mouse down' action\")");
            annotationActions.setD(jsMouseDownAction);
            
            // Create an action when the mouse button is released inside the annotations active area
            PDActionJavaScript jsMouseUpAction = new PDActionJavaScript();
            jsMouseUpAction.setAction("app.alert(\"On 'mouse up' action\")");
            annotationActions.setU(jsMouseUpAction);
            
            // Create an action when the annotation gets the input focus
            PDActionJavaScript jsFocusAction = new PDActionJavaScript();
            jsFocusAction.setAction("app.alert(\"On 'focus' action\")");
            annotationActions.setFo(jsFocusAction);
            
            // Create an action when the annotation loses the input focus
            PDActionJavaScript jsBlurredAction = new PDActionJavaScript();
            jsBlurredAction.setAction("app.alert(\"On 'blurred' action\")");
            annotationActions.setBl(jsBlurredAction);
            
            widget.setActions(annotationActions);
            
            // Actions for the field
            PDFormFieldAdditionalActions fieldActions = new PDFormFieldAdditionalActions();
            
            // Create an action when the user types a keystroke in the field
            PDActionJavaScript jsKeystrokeAction = new PDActionJavaScript();
            jsKeystrokeAction.setAction("app.alert(\"On 'keystroke' action\")");
            fieldActions.setK(jsKeystrokeAction);
            
            // Create an action when the field is formatted to display the current value
            PDActionJavaScript jsFormattedAction = new PDActionJavaScript();
            jsFormattedAction.setAction("app.alert(\"On 'formatted' action\")");
            fieldActions.setF(jsFormattedAction);
            
            // Create an action when the field value changes
            PDActionJavaScript jsChangedAction = new PDActionJavaScript();
            jsChangedAction.setAction("app.alert(\"On 'change' action\")");
            // fieldActions.setV(jsChangedAction);
            
            // Create an action when the field value changes
            PDActionJavaScript jsRecalculateAction = new PDActionJavaScript();
            jsRecalculateAction.setAction("app.alert(\"On 'recalculate' action\")");
            fieldActions.setC(jsRecalculateAction);
            
            // Set the Additional Actions entry for the field
            // Note: this is a workaround as if there is only one widget the widget
            // and the form field may share the same dictionary. Now setting the
            // fields Additional Actions entry directly will overwrite the settings done for
            // the widget.
            // https://issues.apache.org/jira/browse/PDFBOX-3036
            
            field.getActions().getCOSObject().addAll(fieldActions.getCOSObject());
            
            document.save("target/FieldTriggers.pdf");
        }
    }
}
