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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 1997-2017 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
*
* ---------------
* PageFlowFX.java
* ---------------
*/
package org.jpedal.display;
import java.awt.image.BufferedImage;
import java.util.Timer;
import java.util.TimerTask;
import javafx.application.Platform;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.collections.ObservableList;
import javafx.concurrent.Task;
import javafx.embed.swing.SwingFXUtils;
import javafx.event.EventHandler;
import javafx.scene.CacheHint;
import javafx.scene.ImageCursor;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.control.CheckBox;
import javafx.scene.effect.ColorAdjust;
import javafx.scene.effect.PerspectiveTransform;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.image.WritableImage;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.input.MouseEvent;
import javafx.scene.input.ScrollEvent;
import javafx.scene.layout.AnchorPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Line;
import javafx.scene.shape.Rectangle;
import org.jpedal.PdfDecoderInt;
import org.jpedal.objects.acroforms.AcroRenderer;
import org.jpedal.parser.DecoderOptions;
import org.jpedal.utils.LogWriter;
import org.jpedal.utils.Messages;
/**
* Main JavaFX Code for Page Flow Display Mode used
* by both SwingViewer and JavaFXViewer.
*/
public class PageFlowFX extends AnchorPane{
private final boolean isFX;
public PageFlowFX(final PdfDecoderInt pdfDecoder,final boolean isFX) {
// JavaFX cannot be restarted after exiting, so turn off auto exit.
Platform.setImplicitExit(false);
// Setup PDF info
pdf = pdfDecoder;
this.isFX =isFX;
//pageData = pdf.getPdfPageData();
pageCount = pdf.getPageCount();
setPageNumber(pdfDecoder.getPageNumber());
pageFocus = pageNumber;
// Setup for memory management
pagesInMemory = 0;
runtime = Runtime.getRuntime();
final long maxMem = runtime.maxMemory();
if (maxMem * 0.25f < 36000000) {
memoryLimit = maxMem - 36000000;
} else {
memoryLimit = (long) (maxMem * 0.75f);
}
//Disable forms, but store whether they were on so we can restore on dispose()
final AcroRenderer formRenderer = pdf.getFormRenderer();
if (formRenderer != null) {
formsIgnoredStore = formRenderer.ignoreForms();
formRenderer.setIgnoreForms(true);
}
pages = new Page[pageCount];
createScene();
pageLimit = 50;
}
protected final PdfDecoderInt pdf;
private boolean stopAddingPages;
private final int pageCount;
private int displayRotation;
protected int pageNumber;
private int pagesToGenerate = 21;
private static final int textureSize = 256;
private Page[] pages;
private double totalPageWidth;
private Rectangle backgroundTop;
private Rectangle backgroundBottom;
private NavBar navBar;
private ZoomBar zoomBar;
private CheckBox perspectiveCheckBox;
private CheckBox reflectionCheckBox;
//private EventHandler pageListener, messageListener;
private javafx.scene.Cursor defaultCursor, grabbingCursor, grabCursor;
private double sceneXOffset, sceneYOffset;
private boolean currentlyAddingPages;
private boolean memoryWarningShown;
private boolean pageFlowEnding;
private double scaling = 1.5;
private double pageFocus = 1;
private int currentZPosition = -1;
private boolean formsIgnoredStore;
private int pagesInMemory;
private final long memoryLimit;
private final Runtime runtime;
private final int pageLimit;
private boolean pageClickEvent;
private boolean enableReflection = true, enablePerspectiveTransform = true;
private void createScene() {
final ObservableList children = this.getChildren();
sceneXOffset = newSceneWidth / 2;
sceneYOffset = newSceneHeight / 2;
// Create 2 tone background colours.
backgroundTop = new Rectangle(0, 0, newSceneWidth, newSceneHeight / 2);
backgroundTop.setFill(new Color(55 / 255f, 55 / 255f, 65 / 255f, 1));
backgroundBottom = new Rectangle(0, newSceneHeight / 2, newSceneWidth, newSceneHeight / 2);
backgroundBottom.setFill(new Color(28 / 255f, 28 / 255f, 32 / 255f, 1));
// Create nav & zoom bars
navBar = new NavBar();
zoomBar = new ZoomBar();
perspectiveCheckBox = new CheckBox("Perspectives");
perspectiveCheckBox.setLayoutX(5);
perspectiveCheckBox.setLayoutY(5);
perspectiveCheckBox.setTextFill(Color.WHITE);
perspectiveCheckBox.setSelected(true);
perspectiveCheckBox.setOnAction(new EventHandler() {
@Override
public void handle(final javafx.event.ActionEvent actionEvent) {
togglePerspectives();
}
});
reflectionCheckBox = new CheckBox("Reflections");
reflectionCheckBox.setLayoutX(5);
reflectionCheckBox.setLayoutY(25);
reflectionCheckBox.setTextFill(Color.WHITE);
reflectionCheckBox.setSelected(true);
reflectionCheckBox.setOnAction(new EventHandler() {
@Override
public void handle(final javafx.event.ActionEvent actionEvent) {
toggleReflections();
}
});
if (DecoderOptions.isRunningOnLinux) {
toggleReflections();
togglePerspectives();
}
children.addAll(backgroundTop, backgroundBottom, navBar, zoomBar, perspectiveCheckBox, reflectionCheckBox);
setupMouseHandlers();
setupWindowResizeListeners();
addPages();
}
private double newSceneWidth;
private double newSceneHeight;
private void repositionObjects(){
newSceneWidth = getWidth();
newSceneHeight = getHeight();
sceneXOffset = newSceneWidth / 2;
totalPageWidth = pageCount * getPageWidthOrHeight();
sceneYOffset = newSceneHeight / 2;
navBar.update();
zoomBar.update();
Platform.runLater(new Runnable() {
@Override
public void run() {
backgroundTop.setWidth(newSceneWidth);
backgroundBottom.setWidth(newSceneWidth);
backgroundTop.setHeight(newSceneHeight);
backgroundBottom.setHeight(newSceneHeight);
backgroundBottom.setY(newSceneHeight / 2);
if (pages[pageNumber - 1] != null) {
pages[pageNumber - 1].setMain(true);
}
for (final Page page : pages) {
if (page != null) {
page.update();
}
}
}
});
}
// Listen out for window resizes to update the x,y,width,height of pages dynamically.
private void setupWindowResizeListeners() {
widthProperty().addListener(new ChangeListener() {
@Override
public void changed(final ObservableValue observableValue, final Number oldSceneWidth, final Number newSceneWidth) {
repositionObjects();
}
});
heightProperty().addListener(new ChangeListener() {
@Override
public void changed(final ObservableValue observableValue, final Number oldSceneHeight, final Number newSceneHeight) {
repositionObjects();
}
});
}
// volatile fields because they get used across threads so we don't want optimisations like caching.
private volatile double x; //oldX is used so we know how far the mouse has been dragged since the last event.
private volatile boolean isAnimating, stopAnimating;
private void setupMouseHandlers() {
/*
* ******************************************************
* Handle with care please, especially releasedHandler. *
*******************************************************
*/
// If moving then clicked, stop moving
setOnMousePressed(new EventHandler() {
@Override
public void handle(final MouseEvent mouseEvent) {
if (GUIDisplay.allowChangeCursor) {
setCursor(grabbingCursor);
}
if (navBar.isNavBarPress(mouseEvent)) {
// Event is handled in the event check
} else if (zoomBar.isZoomBarPress(mouseEvent)) {
// Event is handled in the event check
} else {
// If we are currently scrolling, tell it to stopAnimating
if (isAnimating) {
stopAnimating = true;
}
//Reset all X positions to current pageFocus.
x = mouseEvent.getSceneX();
}
}
});
// Move pages in the direction being dragged
setOnMouseDragged(new EventHandler() {
@Override
public void handle(final MouseEvent mouseEvent) {
if (navBar.isNavBarDrag(mouseEvent)) {
// The nav bar is handling the drag within navBar.isNavBarDrag().
} else if (zoomBar.isZoomBarDrag(mouseEvent)) {
// The zoom bar is handling the drag within zoomBar.isZoomBarDrag().
} else {
// Move the pages by the amount the mouse was dragged.
final double newPosition = pageFocus - (((mouseEvent.getSceneX() - x) / totalPageWidth) * 4 * pageCount);
if (newPosition > 1 && newPosition < pageCount) {
isAnimating = true;
reorderPages(pageFocus, false);
pageFocus = newPosition;
navBar.update();
for (final Page page : pages) {
if (page != null) {
page.update();
}
}
isAnimating = false;
}
final int newPageNumber = (int) (pageFocus + 0.5);
if (pageNumber != newPageNumber) {
setPageNumber(newPageNumber);
}
addPages();
// Set x positions for next mouse event to use.
x = mouseEvent.getSceneX();
}
}
});
// Move to center of nearest page
setOnMouseReleased(new EventHandler() {
@Override
public void handle(final MouseEvent mouseEvent) {
if (GUIDisplay.allowChangeCursor) {
setCursor(grabCursor);
}
//Reset cursor after delay
final Timer timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
if (GUIDisplay.allowChangeCursor) {
setCursor(defaultCursor);
}
}
}, 350);
if (navBar.isNavBarRelease(mouseEvent)) {
// The nav bar is handling the release.
} else if (zoomBar.isZoomBarRelease()) {
// The zoom bar is handling the release.
} else {
if (!pageClickEvent) {
if (pageFocus < 1) {
pageFocus = 1;
} else if (pageFocus > pageCount) {
pageFocus = pageCount;
}
goTo((int) (pageFocus + 0.5));
} else {
pageClickEvent = false;
}
}
}
});
// Set default cursor when moving
setOnMouseMoved(new EventHandler() {
@Override
public void handle(final MouseEvent mouseEvent) {
if (navBar.isNavBarHover(mouseEvent) || zoomBar.isZoomBarHover(mouseEvent)) {
if (GUIDisplay.allowChangeCursor) {
setCursor(grabCursor);
}
} else {
if (GUIDisplay.allowChangeCursor) {
setCursor(defaultCursor);
}
}
}
});
// Left/right keyboard page change listener
setOnKeyPressed(new EventHandler() {
@Override
public void handle(final KeyEvent keyEvent) {
final KeyCode key = keyEvent.getCode();
switch (key) {
case RIGHT: {
final int dest = pageNumber + 1;
if (dest <= pageCount) {
goTo(dest);
}
break;
}
case LEFT: {
final int dest = pageNumber - 1;
if (dest > 0) {
goTo(dest);
}
break;
}
case R: {
toggleReflections();
break;
}
case T: {
togglePerspectives();
break;
}
}
}
});
// Scroll pages or scroll zoom if ctrl held.
setOnScroll(new EventHandler() {
@Override
public void handle(final ScrollEvent event) {
final double value = event.getDeltaY();
if (event.isControlDown()) {
if (value < 0) {
if (scaling < 2) {
scaling += 0.1;
if (scaling > 2) {
scaling = 2;
}
zoomBar.update();
for (final Page page : pages) {
if (page != null) {
page.update();
}
}
}
} else if ((value > 0) && (scaling > 1)) {
scaling -= 0.1;
if (scaling < 1) {
scaling = 1;
}
zoomBar.update();
for (final Page page : pages) {
if (page != null) {
page.update();
}
}
}
} else {
if (value > 0) {
final int dest = pageNumber - 1;
if (dest > 0) {
goTo(dest);
}
} else {
final int dest = pageNumber + 1;
if (dest <= pageCount) {
goTo(dest);
}
}
}
}
});
// Double click to toggle max/min zoom
setOnMouseClicked(new EventHandler() {
@Override
public void handle(final MouseEvent mouseEvent) {
if (mouseEvent.getClickCount() == 2) {
if (scaling != 1) {
scaling = 1;
} else {
scaling = 2;
}
zoomBar.update();
for (final Page page : pages) {
if (page != null) {
page.update();
}
}
}
}
});
}
// Z positioning in JavaFX is based on the order nodes appear in the Node list/tree.
// Reorder needs to be forced when pages get added.
private void reorderPages(final double pageFocus, final boolean forceReorder) {
final int position = (int) (pageFocus + 0.5);
// Check if reorder is required
if (!forceReorder && (currentZPosition == position || position < 1 || position > pageCount)) {
return;
}
currentZPosition = position;
Platform.runLater(new Runnable() {
@Override
public void run() {
// Add nodes behind the pages. e.g. background
getChildren().clear();
getChildren().add(backgroundTop);
getChildren().add(backgroundBottom);
// Add pages to the right of the current page, then add those to the left.
int i = pageCount;
while (i > position) {
if (pages[i - 1] != null) {
getChildren().add(pages[i - 1]);
if (enableReflection) {
getChildren().add(pages[i - 1].getReflection());
}
}
i--;
}
i = 1;
while (i < position) {
if (pages[i - 1] != null) {
getChildren().add(pages[i - 1]);
if (enableReflection) {
getChildren().add(pages[i - 1].getReflection());
}
}
i++;
}
// Add main page
if (pages[position - 1] != null) {
getChildren().add(pages[position - 1]);
if (enableReflection) {
getChildren().add(pages[position - 1].getReflection());
}
}
// Add nodes appearing in front of pages e.g. nav/zoom controls.
getChildren().add(navBar);
getChildren().add(zoomBar);
getChildren().add(perspectiveCheckBox);
getChildren().add(reflectionCheckBox);
}
});
}
public void setRotation(final int displayRotation) {
//Reload pages if rotation changes
if (this.displayRotation != displayRotation) {
this.displayRotation = displayRotation;
for (final Page p : pages) {
if (p != null) {
p.dispose();
}
}
stop();
stopAddingPages = false;
goTo(pageNumber);
}
}
private void toggleReflections() {
if (enableReflection) {
enableReflection = false;
Platform.runLater(new Runnable() {
@Override
public void run() {
reflectionCheckBox.setSelected(false);
}
});
for (final Page page : pages) {
if (page != null) {
page.disposeReflection();
}
}
reorderPages(pageFocus, true);
} else {
if (enablePerspectiveTransform) {
enableReflection = true;
Platform.runLater(new Runnable() {
@Override
public void run() {
reflectionCheckBox.setSelected(true);
}
});
for (final Page page : pages) {
if (page != null) {
page.setupReflection();
page.update();
}
}
reorderPages(pageFocus, true);
}
}
}
private void togglePerspectives() {
if (enablePerspectiveTransform) {
if (enableReflection) {
toggleReflections();
}
enablePerspectiveTransform = false;
Platform.runLater(new Runnable() {
@Override
public void run() {
perspectiveCheckBox.setSelected(false);
reflectionCheckBox.setDisable(true);
}
});
for (final Page page : pages) {
if (page != null) {
page.disposePerspectiveTransform();
page.update();
}
}
} else {
enablePerspectiveTransform = true;
Platform.runLater(new Runnable() {
@Override
public void run() {
perspectiveCheckBox.setSelected(true);
reflectionCheckBox.setDisable(false);
}
});
for (final Page page : pages) {
if (page != null) {
page.setupPerspectiveTransform();
page.update();
}
}
}
}
public void setCursors(final BufferedImage grab, final BufferedImage grabbing) {
if (grab != null) {
grabCursor = new ImageCursor(SwingFXUtils.toFXImage(grab, new WritableImage(grab.getWidth(), grab.getHeight())), 8, 8);
} else {
grabCursor = javafx.scene.Cursor.DEFAULT;
}
if (grabbing != null) {
grabbingCursor = new ImageCursor(SwingFXUtils.toFXImage(grabbing, new WritableImage(grabbing.getWidth(), grabbing.getHeight())), 8, 8);
} else {
grabbingCursor = javafx.scene.Cursor.DEFAULT;
}
defaultCursor = javafx.scene.Cursor.DEFAULT;
}
private int newDestination;
private double speed;
public void goTo(final int firstDestination) {
setPageNumber(firstDestination);
// This is required because when we drag the pages around, the main does not get unset due to the updating of the page number as we drag.
for (int i = 0; i < pageCount; i++) {
if (pages[i] != null && i != pageNumber - 1) {
pages[i].setMain(false);
}
}
if (pages[pageNumber - 1] != null) {
pages[pageNumber - 1].setMain(true);
}
//update pdfdecoder's pagenumber (-100 flag to prevent loop)
pdf.setPageParameters(-100f, firstDestination);//Purpose is to maintain same page when swapping to Single Pages view-mode.
addPages();
//If already moving set variable to let thread know destination has changed
if (isAnimating) {
newDestination = firstDestination;
return;
}
final Thread thread = new Thread("PageFlow-goTo") {
@Override
public void run() {
int destination = firstDestination;
while (!stopAnimating
&& (pageFocus > destination || pageFocus < destination)) {
//Pick up if destination changed
if (newDestination != 0) {
destination = newDestination;
newDestination = 0;
}
//accelerate
if (pageFocus < destination) {
if (speed < 0.2f) {
speed = 0.2f;
}
speed *= 1.15f;
} else {
if (speed > -0.2f) {
speed = -0.2f;
}
speed *= 1.15f;
}
//cap speed
final double maxSpeed = (destination - pageFocus) / 4;
if (Math.abs(speed) > Math.abs(maxSpeed)) {
speed = maxSpeed;
}
//update page positions
pageFocus += speed;
// If close to int, round off to an int as it improves the image quality and reduces number of updates.
// Don't be too greedy otherwise it will cause pages to jump into final position when they near it.
if (pageFocus - (int) pageFocus > 0.99) {
pageFocus = (int) pageFocus + 1;
} else if (pageFocus - (int) pageFocus < 0.01) {
pageFocus = (int) pageFocus;
}
navBar.update();
reorderPages(pageFocus, false);
for (final Page page : pages) {
if (page != null) {
page.update();
}
}
try {
Thread.sleep(40); // 25fps
} catch (final Exception e) {
LogWriter.writeLog("Exception: " + e.getMessage());
}
//Pick up if destination changed
if (newDestination != 0) {
destination = newDestination;
newDestination = 0;
}
}
stopAnimating = false;
isAnimating = false;
}
};
thread.setDaemon(true);
isAnimating = true;
thread.start();
}
private synchronized Image getPageImage(final int pageNumber, final int rotation, final int quality) {
//Only generate a hi res texture for the current page
if (pageNumber != this.pageNumber && quality > textureSize) {
return null;
}
final int width = pdf.getPdfPageData().getCropBoxWidth(pageNumber);
final int height = pdf.getPdfPageData().getCropBoxHeight(pageNumber);
final float scale;
if (width > height) {
scale = (float) quality / width;
} else {
scale = (float) quality / height;
}
try {
final float currentScaling = pdf.getScaling();
pdf.setScaling(scale);
final BufferedImage raw = pdf.getPageAsImage(pageNumber);
pdf.setScaling(currentScaling);
final BufferedImage result = new BufferedImage(quality, quality, BufferedImage.TYPE_INT_ARGB);
final java.awt.Graphics2D g2 = (java.awt.Graphics2D) result.getGraphics();
g2.rotate((rotation / 180.0) * Math.PI, quality / 2, quality / 2);
final int x = (quality - raw.getWidth()) / 2;
final int y = quality - raw.getHeight();
g2.drawImage(raw, x, y, raw.getWidth(), raw.getHeight(), null);
return SwingFXUtils.toFXImage(result, new WritableImage(result.getWidth(), result.getHeight()));
} catch (final Exception e) {
LogWriter.writeLog("Exception: " + e.getMessage());
}
return null;
}
// Clean up
@SuppressWarnings("UnusedDeclaration")
public void dispose() {
// Dispose of pages & containers
for (final Page page : pages) {
if (page != null) {
page.dispose();
}
}
pages = null;
//Restore forms setting
final AcroRenderer formRenderer = pdf.getFormRenderer();
if (formRenderer != null) {
formRenderer.setIgnoreForms(formsIgnoredStore);
}
// System.gc();
}
public void stop() {
stopAddingPages = true;
if(!isFX){
while (currentlyAddingPages) {
try {
Thread.sleep(100);
} catch (final InterruptedException e) {
LogWriter.writeLog("Exception: " + e.getMessage());
}
}
}
}
/**
* Add pages around the current page
*/
private void addPages() {
final Task task = new Task() {
@Override
protected Void call() throws Exception {
currentlyAddingPages = true;
int firstPage = pageNumber;
//Add pages on either side
for (int i = 0; i <= pagesToGenerate; i++) {
if (checkMemory()) {
return null;
}
final int spacesLeft = ((pagesToGenerate * 2) - 1) - pagesInMemory;
if (spacesLeft < 2) {
removeFurthestPages(2 - spacesLeft);
}
if (i == pagesToGenerate - 1) {
long used = runtime.totalMemory() - runtime.freeMemory();
if (used < memoryLimit && pagesToGenerate < pageCount && pagesToGenerate < pageLimit) {
pagesToGenerate++;
} else {
used = runtime.totalMemory() - runtime.freeMemory();
if (used < memoryLimit && pagesToGenerate < pageCount && pagesToGenerate < pageLimit) {
pagesToGenerate++;
}
}
}
if (stopAddingPages) {
currentlyAddingPages = false;
stopAddingPages = false;
return null;
}
int pn = firstPage + i;
//if 40 from center start doing only even pages
if (i > 40) {
pn += i - 40;
pn -= (pn & 1);
//fill in the odd pages
if (pn > pageCount) {
pn -= (pageCount - (firstPage + 40));
if ((pn & 1) == 0) {
pn--;
}
}
}
if (pn <= pageCount && pages != null && pages[pn - 1] == null) {
try {
final Page page = new Page(pn);
if (pages != null) {
pages[pn - 1] = page;
reorderPages(pageFocus, true);
pagesInMemory++;
if (pn == pageNumber) {
page.setMain(true);
}
}
} catch (final Exception e) {
if (pages != null) {
pages[pn - 1] = null;
}
pagesInMemory--;
LogWriter.writeLog("Exception: " + e.getMessage());
}
}
if (stopAddingPages) {
currentlyAddingPages = false;
stopAddingPages = false;
return null;
}
pn = firstPage - i;
//if 40 from center start doing only even pages
if (i > 40) {
pn -= i - 40;
pn += (pn & 1);
//fill in the odd pages
if (pn < 1) {
pn += (firstPage - 41);
if ((pn & 1) == 0) {
pn--;
}
}
}
if (pn > 0 && pages != null && pages[pn - 1] == null) {
final Page page = new Page(pn);
if (pages != null) {
pages[pn - 1] = page;
reorderPages(pageFocus, true);
pagesInMemory++;
}
}
//update page range to generate
if (firstPage != pageNumber) {
i = -1;
firstPage = pageNumber;
}
//Mandatory sleep so Swing can do it's thing
if (i > 10) {
while ((speed > 0.005f || speed < -0.005f) && firstPage == pageNumber) {
try {
Thread.sleep(10);
} catch (final InterruptedException e) {
LogWriter.writeLog("Exception: " + e.getMessage());
}
}
}
}
currentlyAddingPages = false;
return null;
}
};
final Thread th = new Thread(task);
if (!currentlyAddingPages) {
currentlyAddingPages = true;
th.setDaemon(true);
th.start();
}
}
private boolean checkMemory() {
final int threshold = 32000000;
final boolean debugMemory = false;
if (runtime.maxMemory() - (runtime.totalMemory() - runtime.freeMemory()) < threshold) {
if (debugMemory) {
System.out.println("mem less than threshold - " + pagesInMemory + " pages in memory");
}
if (pagesInMemory > 1) {
if (debugMemory) {
System.out.println("Clearing old pages, calling GC and retesting");
}
// System.gc();
boolean shrinkingSuccessful = true;
while (runtime.maxMemory() - (runtime.totalMemory() - runtime.freeMemory()) < threshold) {
if (pagesToGenerate > 5) {
pagesToGenerate--;
final int toRemove = pagesInMemory - ((pagesToGenerate * 2) - 1);
if (toRemove > 0) {
removeFurthestPages(toRemove);
}
// System.gc();
} else {
shrinkingSuccessful = false;
}
}
if (shrinkingSuccessful) {
return false;
}
if (runtime.maxMemory() - (runtime.totalMemory() - runtime.freeMemory()) < threshold) {
if (!memoryWarningShown) {
if (debugMemory) {
System.out.println("Warning about memory issues.");
}
if (!pageFlowEnding) {
isUpdateMemory = true;
memoryMessage = Messages.getMessage("PdfViewer.PageFlowLowMemory");
}else{
isUpdateMemory = false;
}
memoryWarningShown = true;
}
if (debugMemory) {
System.out.println("Testing finished - no more pages will be added.");
}
currentlyAddingPages = false;
return true;
}
} else {
if (debugMemory) {
System.out.println("Removing and cleaning up");
}
stop();
// canvas.stopRenderer(); // No FX equivalent
if (Platform.isFxApplicationThread()) {
// currentGUI.setDisplayView(Display.SINGLE_PAGE, Display.DISPLAY_CENTERED);
} else {
final Runnable doPaintComponent = new Runnable() {
@Override
public void run() {
// currentGUI.setDisplayView(Display.SINGLE_PAGE, Display.DISPLAY_CENTERED);
}
};
Platform.runLater(doPaintComponent);
}
// pdf.setDisplayView(Display.SINGLE_PAGE, Display.DISPLAY_CENTERED); // Commented in Java3D also
if (!pageFlowEnding) {
pageFlowEnding = true;
isUpdateMemory = true;
memoryMessage = Messages.getMessage("PdfViewer.PageFlowNotEnoughMemory");
}else{
isUpdateMemory = false;
}
return true;
}
}
if (debugMemory) {
System.out.println("Testing finished - adding may resume");
}
return false;
}
private void removeFurthestPages(final int pagesToRemove) {
int pagesRemoved = 0;
final int before = pageNumber - 1;
final int after = pageCount - pageNumber;
final int max = before > after ? before : after;
int cursor = max;
//Remove even pages further than 40 from center first
while (pagesRemoved < pagesToRemove) {
if (cursor < 40) {
break;
}
int pre = (pageNumber - cursor);
pre -= (1 - (pre & 1));
if (pre > 0 && pages[pre - 1] != null) {
pages[pre - 1].dispose();
pagesRemoved++;
}
if (pagesRemoved != pagesToRemove) {
int post = pageNumber + cursor;
post -= (1 - (post & 1));
if (post <= pageCount && pages[post - 1] != null) {
pages[post - 1].dispose();
pagesRemoved++;
}
cursor--;
}
}
cursor = max;
//remove all pages furthest from center now
while (pagesRemoved < pagesToRemove) {
if (cursor < 0) {
break;
}
final int pre = (pageNumber - cursor);
if (pre > 0 && pages[pre - 1] != null) {
pages[pre - 1].dispose();
pagesRemoved++;
}
if (pagesRemoved != pagesToRemove) {
final int post = pageNumber + cursor;
if (post <= pageCount && pages[post - 1] != null) {
pages[post - 1].dispose();
pagesRemoved++;
}
cursor--;
}
}
// System.gc();
}
private double getFullPageWidthOrHeight() {
return (newSceneHeight / 13) * 12;
}
private double getPageWidthOrHeight() {
return (newSceneHeight / (13 * scaling)) * 12;
}
private class Page extends ImageView {
private final Image lowResImage;
private final int page;
private final int rotation;
private PerspectiveTransform trans;
private ColorAdjust colorAdjust;
private int mainTextureSize;
private ImageView reflection;
private PerspectiveTransform reflectionTransform;
private double x, y, widthHeight, altWidthHeight;
Page(final int page) {
this.rotation = displayRotation;
this.page = page;
lowResImage = getPageImage(page, rotation, textureSize);
if (lowResImage == null) {
dispose();
widthHeight = 0;
return;
}
setImage(lowResImage);
setupMouseHandlers();
if (enableReflection) {
setupReflection();
}
colorAdjust = new ColorAdjust();
if (enablePerspectiveTransform) {
setupPerspectiveTransform();
} else {
//setEffect(colorAdjust); // This causes lag too.
}
setCache(true);
setCacheHint(CacheHint.QUALITY); // This seems to have little effect
update();
}
public void setupReflection() {
reflection = new ImageView();
reflectionTransform = new PerspectiveTransform();
reflectionTransform.setInput(new ColorAdjust(0, 0, -0.75, 0));
reflection.setEffect(reflectionTransform);
reflection.setImage(lowResImage);
}
public void disposeReflection() {
reflection = null;
reflectionTransform = null;
}
public void setupPerspectiveTransform() {
trans = new PerspectiveTransform();
trans.setInput(colorAdjust);
setEffect(trans);
}
public void disposePerspectiveTransform() {
trans = null;
setEffect(null);
//setEffect(colorAdjust); // This causes lag too.
}
private void setupMouseHandlers() {
/*
* pageClickEvent is required to let the scene know that we are
* handling the mouse event. setOnMouseClicked still runs even when
* the click includes a drag, hence detecting manually.
*/
setOnMousePressed(new EventHandler() {
@Override
public void handle(final MouseEvent e) {
pageClickEvent = true;
}
});
setOnMouseDragged(new EventHandler() {
@Override
public void handle(final MouseEvent e) {
pageClickEvent = false;
}
});
setOnMouseReleased(new EventHandler() {
@Override
public void handle(final MouseEvent e) {
if (pageClickEvent) {
goTo(page);
}
}
});
}
// Update pageFocus values then redraw.
public void update() {
// Set width based on height.
// Set height based on size of scene & current scaling.
widthHeight = getPageWidthOrHeight();
// Set y to move page up slightly.
y = -widthHeight / 40;
// Set x based on current pageFocus.
// If diff > 1 then put pages closer together (divide distance by 5 essentially).
double diff = page - pageFocus;
if (diff > 1) {
diff = ((diff - 1) / 5) + 1;
} else if (diff < -1) {
diff = ((diff + 1) / 5) - 1;
}
x = diff * widthHeight;
redraw();
}
private void redraw() {
// If new or old pageFocus is visible then update pageFocus & transform.
final boolean update = !enablePerspectiveTransform || trans != null && ((getRealX(x) + widthHeight > 0 && getRealX(x) < newSceneWidth)
|| (trans.getUrx() > 0 && trans.getUlx() < newSceneWidth));
if (update) {
Platform.runLater(new Runnable() {
@Override
public void run() {
// Use distance from current pageFocus to define the transform.
double diff = page - pageFocus;
double ddiff = Math.abs(diff);
if (ddiff > 1) {
ddiff = ((ddiff - 1) / (enablePerspectiveTransform ? 16 : 8)) + 1;
}
final double distanceScale = Math.pow(1 - 0.3, ddiff);
if (diff > 1) {
diff = 1;
}
if (diff < -1) {
diff = -1;
}
final boolean rightSide = diff > 0;
diff = Math.abs(diff);
// If the page is in the middle, turn off the PerspectiveTransform as it will sharpen the image by a good margin!
if (diff == 0) {
setEffect(null);
} else {
if (enablePerspectiveTransform) {
setEffect(trans);
}
}
colorAdjust.setBrightness(-diff / 2);
final double halfWidthHeight = widthHeight / 2;
double halfDiff = diff / 2;
if (!enablePerspectiveTransform) {
halfDiff /= 8;
}
final double quarterDiff = diff / 4;
//Set X values
final double lx = getRealX(halfWidthHeight + x - (1 - halfDiff) * halfWidthHeight * distanceScale);
final double rx = getRealX(halfWidthHeight + x + (1 - halfDiff) * halfWidthHeight * distanceScale);
if (enablePerspectiveTransform) {
trans.setLlx(lx);
trans.setUlx(lx);
trans.setLrx(rx);
trans.setUrx(rx);
// Set Y values
if (rightSide) { // Slant to left
trans.setLly(getRealY(halfWidthHeight + y + (1 - quarterDiff) * halfWidthHeight * distanceScale));
trans.setUly(getRealY(halfWidthHeight + y - (1 - quarterDiff) * halfWidthHeight * distanceScale));
trans.setLry(getRealY(halfWidthHeight + y + halfWidthHeight * distanceScale));
trans.setUry(getRealY(halfWidthHeight + y - halfWidthHeight * distanceScale));
} else { // Slant to right
trans.setLry(getRealY(halfWidthHeight + y + (1 - quarterDiff) * halfWidthHeight * distanceScale));
trans.setUry(getRealY(halfWidthHeight + y - (1 - quarterDiff) * halfWidthHeight * distanceScale));
trans.setLly(getRealY(halfWidthHeight + y + halfWidthHeight * distanceScale));
trans.setUly(getRealY(halfWidthHeight + y - halfWidthHeight * distanceScale));
}
}
if (enableReflection) {
// Set reflection X values
reflectionTransform.setLlx(lx);
reflectionTransform.setUlx(lx);
reflectionTransform.setLrx(rx);
reflectionTransform.setUrx(rx);
// Set reflection y values
reflectionTransform.setLly(trans.getLly());
reflectionTransform.setLry(trans.getLry());
reflectionTransform.setUly(trans.getLly() + (trans.getLly() - trans.getUly()));
reflectionTransform.setUry(trans.getLry() + (trans.getLry() - trans.getUry()));
}
// Set X,Y,Width,Height.
// This is redundant after setting the PerspectiveTransform but still useful to set.
if (!enablePerspectiveTransform) {
altWidthHeight = (rx - lx);
if (diff == 0) {
setFitWidth((int) altWidthHeight);
setFitHeight((int) altWidthHeight);
} else {
setFitWidth(altWidthHeight);
setFitHeight(altWidthHeight);
}
} else {
if (diff == 0) {
setFitWidth((int) widthHeight);
setFitHeight((int) widthHeight);
} else {
setFitWidth(widthHeight);
setFitHeight(widthHeight);
}
}
if (diff == 0) {
setX((int) getRealX(x));
setY((int) getRealY(y));
} else {
setX(getRealX(x));
setY(getRealY(y));
}
}
});
}
}
public void setMain(final boolean isMain) {
if (isMain) {
final Thread t = new Thread("FX-setMain") {
@Override
public void run() {
if (checkMemory()) {
return;
}
// if (!isFX) {
mainTextureSize = (int) getFullPageWidthOrHeight();
final Image img = getPageImage(page, rotation, mainTextureSize);
Platform.runLater(new Runnable() {
@Override
public void run() {
if (img != null) {
setImage(img);
}
}
});
// }
}
};
t.setDaemon(true);
t.start();
} else {
Platform.runLater(new Runnable() {
@Override
public void run() {
setImage(lowResImage);
}
});
}
}
private ImageView getReflection() {
return reflection;
}
// Convert an x pageFocus into a real world coordinate.
private double getRealX(final double x) {
return sceneXOffset + getXOffset() + x;
}
// Convert a y pageFocus into a real world coordinate.
private double getRealY(final double y) {
return sceneYOffset + getYOffset() + y;
}
private double getXOffset() {
if (enablePerspectiveTransform) {
return -widthHeight / 2;
} else {
return -altWidthHeight / 2;
}
}
private double getYOffset() {
if (enablePerspectiveTransform) {
return -widthHeight / 2;
} else {
return -altWidthHeight / 2;
}
}
public void dispose() {
Platform.runLater(new Runnable() {
@Override
public void run() {
setImage(null);
}
});
pagesInMemory--;
pages[page - 1] = null;
}
}
private class NavBar extends Parent {
private final Line navLine;
private final Circle navCircle;
private static final int distanceFromSides = 20;
private static final int distanceFromBottom = 15;
private boolean handlingMouse;
NavBar() {
navLine = new Line();
navLine.setStrokeWidth(1.5);
navLine.setStroke(Color.WHITE);
navCircle = new Circle(5);
navCircle.setStrokeWidth(2);
navCircle.setStroke(Color.WHITE);
navCircle.setFill(Color.GRAY);
getChildren().addAll(navLine, navCircle);
}
public boolean isNavBarHover(final MouseEvent mouseEvent) {
return mouseEvent.getY() > newSceneHeight - (distanceFromBottom * 2);
}
public boolean isNavBarPress(final MouseEvent mouseEvent) {
if (mouseEvent.getY() > newSceneHeight - (distanceFromBottom * 2)) {
handlingMouse = true;
return true;
} else {
return false;
}
}
public boolean isNavBarDrag(final MouseEvent mouseEvent) {
if (handlingMouse) {
double x = mouseEvent.getX();
if (x < distanceFromSides) {
x = distanceFromSides;
}
if (x > newSceneWidth - distanceFromSides) {
x = newSceneWidth - distanceFromSides;
}
if (x != navCircle.getCenterX()) {
navCircle.setCenterX(x);
final double percent = (x - distanceFromSides) / (newSceneWidth - (distanceFromSides * 2));
pageFocus = ((pageCount - 1) * percent) + 1;
final int newPageNumber = (int) (pageFocus + 0.5);
if (pageNumber != newPageNumber) {
setPageNumber(newPageNumber);
}
addPages();
reorderPages(pageFocus, false);
for (final Page page : pages) {
if (page != null) {
page.update();
}
}
}
return true;
} else {
return false;
}
}
public boolean isNavBarRelease(final MouseEvent mouseEvent) {
if (handlingMouse) {
double x = mouseEvent.getX();
if (x < distanceFromSides) {
x = distanceFromSides;
}
if (x > newSceneWidth - distanceFromSides) {
x = newSceneWidth - distanceFromSides;
}
final double percent = (x - distanceFromSides) / (newSceneWidth - (distanceFromSides * 2));
final int newPageNumber = (int) ((((pageCount - 1) * percent) + 1) + 0.5);
if (pageNumber != newPageNumber) {
setPageNumber(newPageNumber);
}
goTo(pageNumber);
handlingMouse = false;
return true;
} else {
return false;
}
}
public void update() {
Platform.runLater(new Runnable() {
@Override
public void run() {
navCircle.setCenterY(newSceneHeight - distanceFromBottom);
navLine.setStartX(distanceFromSides);
navLine.setStartY(newSceneHeight - distanceFromBottom + 0.5);// +0.5 to make pixel perfect line
navLine.setEndX(newSceneWidth - distanceFromSides);
navLine.setEndY(newSceneHeight - distanceFromBottom + 0.5);// +0.5 to make pixel perfect line
final double percent = (pageFocus - 1) / (pageCount - 1);
final double x = distanceFromSides + ((newSceneWidth - (distanceFromSides * 2)) * percent);
navCircle.setCenterX(x);
}
});
}
}
private class ZoomBar extends Parent {
private final Line zoomLine;
private final Circle zoomCircle;
private static final int distanceFromSide = 15;
private boolean handlingMouse;
ZoomBar() {
zoomLine = new Line();
zoomLine.setStrokeWidth(1.5);
zoomLine.setStroke(Color.WHITESMOKE);
zoomCircle = new Circle(5);
zoomCircle.setStrokeWidth(2);
zoomCircle.setStroke(Color.WHITE);
zoomCircle.setFill(Color.GRAY);
getChildren().addAll(zoomLine, zoomCircle);
}
public boolean isZoomBarHover(final MouseEvent mouseEvent) {
return mouseEvent.getX() < distanceFromSide * 2
&& mouseEvent.getY() > getStartY() - 5 && mouseEvent.getY() < getEndY() + 5; // Allow +/- 5
}
public boolean isZoomBarPress(final MouseEvent mouseEvent) {
if (mouseEvent.getX() < distanceFromSide * 2
&& mouseEvent.getY() > getStartY() - 5 && mouseEvent.getY() < getEndY() + 5) { // Allow +/- 5
handlingMouse = true;
isZoomBarDrag(mouseEvent);// Borrow what happens with the drag!
return true;
} else {
return false;
}
}
public boolean isZoomBarDrag(final MouseEvent mouseEvent) {
if (handlingMouse) {
double y = mouseEvent.getY();
final double start = getStartY();
final double end = getEndY();
if (y < start) {
y = start;
}
if (y > end) {
y = end;
}
if (y != zoomCircle.getCenterY()) {
zoomCircle.setCenterY(y);
final double percent = (y - start) / (end - start);
scaling = 1 + percent;
for (final Page page : pages) {
if (page != null) {
page.update();
}
}
}
return true;
} else {
return false;
}
}
public boolean isZoomBarRelease() {
if (handlingMouse) {
handlingMouse = false;
return true;
} else {
return false;
}
}
public void update() {
Platform.runLater(new Runnable() {
@Override
public void run() {
zoomCircle.setCenterX(distanceFromSide);
zoomLine.setStartX(distanceFromSide + 0.5);// +0.5 to make pixel perfect line
zoomLine.setStartY(newSceneHeight * 0.2);
zoomLine.setEndX(distanceFromSide + 0.5);// +0.5 to make pixel perfect line
zoomLine.setEndY(newSceneHeight * 0.4);
final double percent = 2 - scaling;
final double start = getStartY();
final double end = getEndY();
zoomCircle.setCenterY(end - ((end - start) * percent));
}
});
}
private double getStartY() {
return newSceneHeight * 0.2;
}
private double getEndY() {
return newSceneHeight * 0.4;
}
}
public PdfDecoderInt getPdfDecoderInt() {
return pdf;
}
final DoubleProperty pageNumberProperty = new SimpleDoubleProperty();
public DoubleProperty getPageNumber() {
return pageNumberProperty;
}
private void setPageNumber(final int pn){
pageNumberProperty.set(pn);
pageNumber = pn;
}
private boolean isUpdateMemory;
public boolean isUpdateMemory(){
return isUpdateMemory;
}
private String memoryMessage;
public String getMemoryMessage(){
return memoryMessage;
}
}