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/*
* Copyright (C) 2022 Parisi Alessandro
* This file is part of MaterialFX (https://github.com/palexdev/MaterialFX).
*
* MaterialFX 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 3 of the License, or
* (at your option) any later version.
*
* MaterialFX 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 MaterialFX. If not, see .
*/
package io.github.palexdev.materialfx.utils;
import io.github.palexdev.materialfx.factories.MFXAnimationFactory;
import javafx.animation.Animation;
import javafx.animation.Animation.Status;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.event.EventHandler;
import javafx.geometry.Bounds;
import javafx.scene.control.Control;
import javafx.scene.control.ScrollBar;
import javafx.scene.control.ScrollPane;
import javafx.scene.input.MouseEvent;
import javafx.scene.input.ScrollEvent;
import javafx.util.Duration;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Function;
import java.util.stream.Collectors;
/**
* Utility class for ScrollPanes.
*/
public class ScrollUtils {
public enum ScrollDirection {
UP(-1), RIGHT(-1), DOWN(1), LEFT(1);
final int intDirection;
ScrollDirection(int intDirection) {
this.intDirection = intDirection;
}
public int intDirection() {
return intDirection;
}
}
private ScrollUtils() {
}
/**
* Determines if the given ScrollEvent comes from a trackpad.
*
* Although this method works in most cases, it is not very accurate.
* Since in JavaFX there's no way to tell if a ScrollEvent comes from a trackpad or a mouse
* we use this trick: I noticed that a mouse scroll has a delta of 32 (don't know if it changes depending on the device or OS)
* and trackpad scrolls have a way smaller delta. So depending on the scroll direction we check if the delta is lesser than 10
* (trackpad event) or greater(mouse event).
*
* @see ScrollEvent#getDeltaX()
* @see ScrollEvent#getDeltaY()
*/
public static boolean isTrackPad(ScrollEvent event, ScrollDirection scrollDirection) {
switch (scrollDirection) {
case UP:
case DOWN:
return Math.abs(event.getDeltaY()) < 10;
case LEFT:
case RIGHT:
return Math.abs(event.getDeltaX()) < 10;
default:
return false;
}
}
/**
* Determines the scroll direction of the given ScrollEvent.
*
* Although this method works fine, it is not very accurate.
* In JavaFX there's no concept of scroll direction, if you try to scroll with a trackpad
* you'll notice that you can scroll in both directions at the same time, both deltaX and deltaY won't be 0.
*
* For this method to work we assume that this behavior is not possible.
*
* If deltaY is 0 we return LEFT or RIGHT depending on deltaX (respectively if lesser or greater than 0).
*
* Else we return DOWN or UP depending on deltaY (respectively if lesser or greater than 0).
*
* @see ScrollEvent#getDeltaX()
* @see ScrollEvent#getDeltaY()
*/
public static ScrollDirection determineScrollDirection(ScrollEvent event) {
double deltaX = event.getDeltaX();
double deltaY = event.getDeltaY();
if (deltaY == 0.0) {
return deltaX < 0 ? ScrollDirection.LEFT : ScrollDirection.RIGHT;
} else {
return deltaY < 0 ? ScrollDirection.DOWN : ScrollDirection.UP;
}
}
//================================================================================
// ScrollPanes
//================================================================================
/**
* Adds a smooth scrolling effect to the given scroll pane,
* calls {@link #addSmoothScrolling(ScrollPane, double)} with a
* default speed value of 1.
*/
public static void addSmoothScrolling(ScrollPane scrollPane) {
addSmoothScrolling(scrollPane, 1);
}
/**
* Adds a smooth scrolling effect to the given scroll pane with the given scroll speed.
* Calls {@link #addSmoothScrolling(ScrollPane, double, double)}
* with a default trackPadAdjustment of 7.
*/
public static void addSmoothScrolling(ScrollPane scrollPane, double speed) {
addSmoothScrolling(scrollPane, speed, 7);
}
/**
* Adds a smooth scrolling effect to the given scroll pane with the given
* scroll speed and the given trackPadAdjustment.
*
* The trackPadAdjustment is a value used to slow down the scrolling if a trackpad is used.
* This is kind of a workaround and it's not perfect, but at least it's way better than before.
* The default value is 7, tested up to 10, further values can cause scrolling misbehavior.
*/
public static void addSmoothScrolling(ScrollPane scrollPane, double speed, double trackPadAdjustment) {
smoothScroll(scrollPane, speed, trackPadAdjustment);
}
private static void smoothScroll(ScrollPane scrollPane, double speed, double trackPadAdjustment) {
final double[] frictions = {0.99, 0.1, 0.05, 0.04, 0.03, 0.02, 0.01, 0.04, 0.01, 0.008, 0.008, 0.008, 0.008, 0.0006, 0.0005, 0.00003, 0.00001};
final double[] derivatives = new double[frictions.length];
AtomicReference atomicSpeed = new AtomicReference<>(speed);
Timeline timeline = new Timeline();
AtomicReference scrollDirection = new AtomicReference<>();
final EventHandler mouseHandler = event -> timeline.stop();
final EventHandler scrollHandler = event -> {
if (event.getEventType() == ScrollEvent.SCROLL) {
scrollDirection.set(determineScrollDirection(event));
if (isTrackPad(event, scrollDirection.get())) {
atomicSpeed.set(speed / trackPadAdjustment);
} else {
atomicSpeed.set(speed);
}
derivatives[0] += scrollDirection.get().intDirection * atomicSpeed.get();
if (timeline.getStatus() == Status.STOPPED) {
timeline.play();
}
event.consume();
}
};
if (scrollPane.getContent().getParent() != null) {
scrollPane.getContent().getParent().addEventHandler(MouseEvent.MOUSE_PRESSED, mouseHandler);
scrollPane.getContent().getParent().addEventHandler(ScrollEvent.ANY, scrollHandler);
}
scrollPane.getContent().parentProperty().addListener((observable, oldValue, newValue) -> {
if (oldValue != null) {
oldValue.removeEventHandler(MouseEvent.MOUSE_PRESSED, mouseHandler);
oldValue.removeEventHandler(ScrollEvent.ANY, scrollHandler);
}
if (newValue != null) {
newValue.addEventHandler(MouseEvent.MOUSE_PRESSED, mouseHandler);
newValue.addEventHandler(ScrollEvent.ANY, scrollHandler);
}
});
timeline.getKeyFrames().add(new KeyFrame(Duration.millis(3), event -> {
for (int i = 0; i < derivatives.length; i++) {
derivatives[i] *= frictions[i];
}
for (int i = 1; i < derivatives.length; i++) {
derivatives[i] += derivatives[i - 1];
}
double dy = derivatives[derivatives.length - 1];
Function sizeFunction = (scrollDirection.get() == ScrollDirection.UP || scrollDirection.get() == ScrollDirection.DOWN) ? Bounds::getHeight : Bounds::getWidth;
double size = sizeFunction.apply(scrollPane.getContent().getLayoutBounds());
double value;
switch (scrollDirection.get()) {
case LEFT:
case RIGHT:
value = Math.min(Math.max(scrollPane.hvalueProperty().get() + dy / size, 0), 1);
scrollPane.hvalueProperty().set(value);
break;
case UP:
case DOWN:
value = Math.min(Math.max(scrollPane.vvalueProperty().get() + dy / size, 0), 1);
scrollPane.vvalueProperty().set(value);
break;
}
if (Math.abs(dy) < 0.001) {
timeline.stop();
}
}));
timeline.setCycleCount(Animation.INDEFINITE);
}
/**
* Adds a fade in and out effect to the given scroll pane's scroll bars,
* calls {@link #animateScrollBars(ScrollPane, double)} with a
* default fadeSpeedMillis value of 500.
*/
public static void animateScrollBars(ScrollPane scrollPane) {
animateScrollBars(scrollPane, 500);
}
/**
* Adds a fade in and out effect to the given scroll pane's scroll bars,
* calls {@link #animateScrollBars(ScrollPane, double, double)} with a
* default fadeSpeedMillis value of 500 and a default hideAfterMillis value of 800.
*/
public static void animateScrollBars(ScrollPane scrollPane, double fadeSpeedMillis) {
animateScrollBars(scrollPane, fadeSpeedMillis, 800);
}
/**
* Adds a fade in and out effect to the given scroll pane's scroll bars
* with the given fadeSpeedMillis and hideAfterMillis values.
*
* @see NodeUtils#waitForSkin(Control, Runnable, boolean, boolean)
*/
public static void animateScrollBars(ScrollPane scrollPane, double fadeSpeedMillis, double hideAfterMillis) {
NodeUtils.waitForSkin(scrollPane, () -> {
Set scrollBars = scrollPane.lookupAll(".scroll-bar").stream()
.filter(node -> node instanceof ScrollBar)
.map(node -> (ScrollBar) node)
.collect(Collectors.toSet());
scrollBars.forEach(scrollBar -> {
scrollBar.setOpacity(0.0);
scrollPane.hoverProperty().addListener((observable, oldValue, newValue) -> {
if (!scrollBar.isVisible()) {
return;
}
if (newValue) {
MFXAnimationFactory.FADE_IN.build(scrollBar, fadeSpeedMillis).play();
} else {
AnimationUtils.PauseBuilder.build()
.setDuration(hideAfterMillis)
.setOnFinished(event -> MFXAnimationFactory.FADE_OUT.build(scrollBar, fadeSpeedMillis).play())
.getAnimation()
.play();
}
});
});
}, true, true);
}
}