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An Open Source JavaFX PDF Viewer
/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/support/
*
* (C) Copyright 1997-2016 IDRsolutions and Contributors.
*
* This file is part of JPedal/JPDF2HTML5
*
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
*
* ---------------
* JavaFXThumbnailPanel.java
* ---------------
*/
package org.jpedal.examples.viewer.gui.javafx;
import java.awt.Font;
import java.awt.image.BufferedImage;
import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Platform;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.concurrent.Task;
import javafx.embed.swing.SwingFXUtils;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Bounds;
import javafx.geometry.Pos;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.control.Button;
import javafx.scene.control.ContentDisplay;
import javafx.scene.control.ScrollPane;
import javafx.scene.control.Tab;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.*;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.util.Duration;
import org.jpedal.PdfDecoderInt;
import org.jpedal.ThumbnailDecoder;
import org.jpedal.display.GUIThumbnailPanel;
import org.jpedal.examples.viewer.Values;
import org.jpedal.objects.PdfPageData;
/**
* Used in GUI example code.
*
adds thumbnail capabilities to viewer,
*
shows pages as thumbnails within this panel,
*
So this panel can be added to the viewer
*
*/
public class JavaFXThumbnailPanel extends Tab implements GUIThumbnailPanel {
private static final boolean debugThumbnails = false;
/**can switch on or off thumbnails*/
private boolean showThumbnailsdefault=true;
private boolean generateOtherVisibleThumbnails;
private boolean showThumbnails=showThumbnailsdefault;
private final PdfDecoderInt decode_pdf;
private final ThumbnailDecoder thumbDecoder;
/**width and height for thumbnails*/
private static final int thumbH=100,thumbW=70;
private Task worker;
private boolean drawing;
private static final boolean debug = true;
private boolean interrupt;
private Button[] pageButton;
private final VBox content;
private final ScrollPane scroll;
private int lastPage;
private boolean[] isLandscape;
private int[] pageHeight;
private BufferedImage[] images;
private boolean[] buttonDrawn;
private final ThumbPainter painter;
private final BorderListener border;
private final Border selectedBorder;
private final Border hoverBorder;
private final Border emptyBorder;
public JavaFXThumbnailPanel(final PdfDecoderInt decode_pdf) {
border = new BorderListener();
painter = new ThumbPainter();
this.decode_pdf = decode_pdf;
thumbDecoder = new ThumbnailDecoder(decode_pdf);
content = new VBox();
scroll = new ScrollPane(content);
content.setAlignment(Pos.CENTER);
scroll.viewportBoundsProperty().addListener(new ChangeListener() {
@Override public void changed(final ObservableValue ov, final Bounds oldb, final Bounds newb) {
// binding the pref width doesn't seem to work in this context so using a listener
content.setPrefWidth(newb.getWidth());
if(drawing) {
terminateDrawing();
}
decode_pdf.waitForDecodingToFinish();
if(decode_pdf.isOpen()) {
drawThumbnails();
}
}
});
selectedBorder = new Border(new BorderStroke(Color.RED, BorderStrokeStyle.SOLID, CornerRadii.EMPTY, new BorderWidths(2)));
hoverBorder = new Border(new BorderStroke(Color.BLUE, BorderStrokeStyle.SOLID, CornerRadii.EMPTY, new BorderWidths(2)));
emptyBorder = new Border(new BorderStroke(Color.TRANSPARENT, BorderStrokeStyle.SOLID, CornerRadii.EMPTY, new BorderWidths(2)));
this.setContent(scroll);
}
@Override
public boolean isShownOnscreen() {
return showThumbnails;
}
@Override
public void terminateDrawing() {
generateOtherVisibleThumbnails = false;
if(drawing){
interrupt = true;
// Removed the loop that was in Swing
// This is due to deadlocking with the FX application Thread
// So now what happens is we call interupt and allow any thumbnails
// being decoded to finish.
}
}
@Override
public void setIsDisplayedOnscreen(final boolean b) {
showThumbnails = b;
}
@Override
public Object[] getButtons() {
return pageButton;
}
@Override
public void addComponentListener() {
scroll.vvalueProperty().addListener(painter);
}
@Override
public synchronized void generateOtherVisibleThumbnails(final int currentPage) {
//flag to show drawing which terminate can reset
generateOtherVisibleThumbnails=true;
//stop multiple calls
if(currentPage==-1 || currentPage==lastPage || pageButton==null) {
return;
}
final int count = decode_pdf.getPageCount();
for(int i = 0; i < count; i++){
if(!generateOtherVisibleThumbnails) {
return;
}
pageButton[i].setBorder(emptyBorder);
}
if((currentPage-1 < pageButton.length)&&
(count > 1 && currentPage > 0)){
pageButton[currentPage-1].setBorder(selectedBorder);
}
final double pos = ((scroll.getVmax() / count) * (currentPage-1));
scroll.setVvalue( pos);
if(!generateOtherVisibleThumbnails) {
return;
}
//commonValues.setProcessing(false);
if(drawing) {
terminateDrawing();
}
if(!generateOtherVisibleThumbnails) {
return;
}
drawThumbnails();
}
@Override
public void setupThumbnails(final int pages, final Font textFont, final PdfPageData pageData) {
lastPage = -1;
content.getChildren().clear();
final Image blankPortrait = createBlankThumbnail(thumbW, thumbH);
final Image blankLandscape = createBlankThumbnail(thumbH, thumbW);
isLandscape = new boolean[pages];
pageHeight = new int[pages];
pageButton = new Button[pages];
images = new BufferedImage[pages];
buttonDrawn = new boolean[pages];
for(int i = 0; i < pages; i++){
final int page=i+1;
String pageLabel = decode_pdf.getIO().convertPageNumberToLabel(page);
if(pageLabel==null){
pageLabel = String.valueOf(page);
}
//create blank image with correct orientation
final int ph;//pw
final int cropWidth=pageData.getCropBoxWidth(page);
final int cropHeight=pageData.getCropBoxHeight(page);
final int rotation=pageData.getRotation(page);
//Image usedLandscape;
final Image usedPortrait;
if((rotation==0)|(rotation==180)){
ph=(pageData.getMediaBoxHeight(page));
//pw=(pageData.getMediaBoxWidth(page));//%%
//usedLandscape = blankLandscape;
usedPortrait = blankPortrait;
}else{
ph=(pageData.getMediaBoxWidth(page));
//pw=(pageData.getMediaBoxHeight(page));//%%
//usedLandscape = blankPortrait;
usedPortrait = blankLandscape;
}
if(cropWidth > cropHeight){
// VBox contents = new VBox(new ImageView(usedLandscape), new Label(message + ' ' + page));
final Button imageButton = new Button(pageLabel, new ImageView(usedPortrait));
pageButton[i] = imageButton;
isLandscape[i] = true;
}else{
// VBox contents = new VBox(new ImageView(usedPortrait), new Label());
final Button imageButton = new Button(pageLabel, new ImageView(usedPortrait));
pageButton[i] = imageButton;
isLandscape[i] = false;
}
pageHeight[i] = ph;
pageButton[i].setContentDisplay(ContentDisplay.TOP);
// Remove button styles
pageButton[i].setStyle("-fx-padding:0;-fx-background-color:transparent;");
if(i == 0 && pages > 1){
pageButton[0].setBorder(selectedBorder);
}else{
pageButton[i].setBorder(emptyBorder);
}
pageButton[i].prefWidthProperty().bind(content.prefWidthProperty());
content.getChildren().add(pageButton[i]);
pageButton[i].setOnMouseEntered(border);
pageButton[i].setOnMouseExited(border);
}
}
@Override
public void resetToDefault() {
showThumbnails = showThumbnailsdefault;
}
@Override
public void removeAllListeners() {
scroll.vvalueProperty().removeListener(painter);
for(final Button btn : pageButton){
btn.setOnMouseExited(null);
btn.setOnMouseEntered(null);
btn.setOnAction(null);
}
}
@Override
public void setThumbnailsEnabled(final boolean newValue) {
showThumbnailsdefault=newValue;
showThumbnails=newValue;
}
@Override
public void dispose() {
}
@Override
public synchronized BufferedImage getImage(int page){
//actually stored starting 0 not 1 so adjust
page--;
if(images==null || images[page]==null){
if(page>-1){
int h = thumbH;
if (isLandscape[page]) {
h = thumbW;
}
final BufferedImage image = thumbDecoder.getPageAsThumbnail(page + 1, h);
images[page]=image;
return image;
}else {
return null;
}
}else {
return images[page];
}
}
@Override
public void drawThumbnails() {
if(!isSelected()) {
return;
}
//do not generate if still loading Linearized
if(decode_pdf.isLoadingLinearizedPDF()) {
return;
}
// Allow for re-entry
if(drawing) {
this.terminateDrawing();
}
worker = new Task() {
@Override
protected Void call() throws Exception{
if(buttonDrawn != null && pageButton != null){
drawing = true;
try{
final double minY = (scroll.getVvalue() * content.getHeight() - (scroll.getHeight() * scroll.getVvalue()));
final Rectangle visible = new Rectangle(0, minY, scroll.getWidth(), scroll.getHeight());
final int pages = decode_pdf.getPageCount();
for(int i = 0; i < pages; i++){
decode_pdf.waitForDecodingToFinish();
// i > pageButton.length fixes exception thrown when opening a new PDF
if(interrupt || i > pageButton.length){
i=pages;
} else if (!buttonDrawn[i] && pageButton[i] != null
&& visible.intersects(pageButton[i].getBoundsInParent())){
int h = thumbH;
if(isLandscape[i]) {
h = thumbW;
}
final BufferedImage page = thumbDecoder.getPageAsThumbnail(i+1, h);
if(!interrupt) {
createThumbnail(page, i);
}
}
}
}catch(final Exception e){
e.printStackTrace();
}
}
//always reset flag so we can interupt
interrupt=false;
drawing=false;
return null;
}
};
new Thread(worker, "Thumbnail Thread").start();
}
/**
* create a blank tile with a cross to use as a thumbnail for unloaded page
*/
private static Image createBlankThumbnail(final int w, final int h) {
final Canvas canvas = new Canvas(w,h);
final GraphicsContext gc = canvas.getGraphicsContext2D();
gc.setFill(Color.WHITE);
gc.fillRect(0.2, 0.2, w-.5, h-.5);
gc.setFill(Color.BLACK);
gc.strokeRect(0.2, 0.2, w-.5, h-.5);
gc.strokeLine(0, 0, w, h);
gc.strokeLine(0, h, w, 0);
return canvas.snapshot(null, null);
}
private void createThumbnail(final BufferedImage page, final int i){
if(page!=null){
final Image image = SwingFXUtils.toFXImage(page, null);
if(Platform.isFxApplicationThread()){
((ImageView)pageButton[i].getGraphic()).setImage(image);
buttonDrawn[i] = true;
images[i] = page;
}else{
Platform.runLater(new Runnable() {
@Override public void run() {
((ImageView)pageButton[i].getGraphic()).setImage(image);
buttonDrawn[i] = true;
images[i] = page;
}
});
}
}
}
private class ThumbPainter implements ChangeListener{
private boolean requestMade;
private final Timeline trapMultipleMovements = new Timeline(new KeyFrame(Duration.millis(250), new EventHandler() {
@Override public void handle(final ActionEvent event) {
if(!requestMade){
requestMade = true;
if(!Values.isProcessing){
if(drawing) {
terminateDrawing();
}
requestMade = false;
drawThumbnails();
}
}
}
}));
@Override
public void changed(final ObservableValue observable, final Number oldValue, final Number newValue) {
if(trapMultipleMovements.getStatus() == Animation.Status.RUNNING) {
trapMultipleMovements.stop();
}
trapMultipleMovements.setCycleCount(1);
trapMultipleMovements.playFromStart();
}
}
private class BorderListener implements EventHandler{
@Override
public void handle(final MouseEvent event) {
final Button source = (Button)event.getSource();
final boolean isSelected = source.getBorder().equals(selectedBorder);
if(event.getEventType().equals(MouseEvent.MOUSE_ENTERED) && !isSelected){
source.setBorder(hoverBorder);
}else if(event.getEventType().equals(MouseEvent.MOUSE_EXITED) && !isSelected){
source.setBorder(emptyBorder);
}
}
}
}
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