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desktop/src/main/java/bisq/desktop/components/BisqScrollPane.java
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| /* | ||
| * This file is part of Bisq. | ||
| * | ||
| * Bisq is free software: you can redistribute it and/or modify it | ||
| * under the terms of the GNU Affero General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or (at | ||
| * your option) any later version. | ||
| * | ||
| * Bisq 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 Affero General Public | ||
| * License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with Bisq. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
|
|
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| package bisq.desktop.components; | ||
|
|
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| import javafx.scene.Node; | ||
| import javafx.scene.control.ScrollPane; | ||
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| import javafx.beans.value.ChangeListener; | ||
| import javafx.beans.value.ObservableValue; | ||
|
|
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| /** | ||
| * Custom scroll pane that uses a workaround to fix slow vertical scrolling. | ||
| */ | ||
| public class BisqScrollPane extends ScrollPane { | ||
|
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| private final double BASE_DELTA_Y_MULTIPLIER = 0.8; | ||
| private double deltaYMultiplier = BASE_DELTA_Y_MULTIPLIER; | ||
|
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| public BisqScrollPane() { | ||
| super(); | ||
| if (getContent() == null) { | ||
| contentProperty().addListener(new ChangeListener<>() { | ||
| @Override | ||
| public void changed(ObservableValue<? extends Node> o, Node oldVal, Node newVal) { | ||
| contentProperty().removeListener(this); | ||
| changeScrollingSpeed(); | ||
| } | ||
| }); | ||
| } else { | ||
| changeScrollingSpeed(); | ||
| } | ||
| } | ||
|
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| private void changeScrollingSpeed() { | ||
| getContent().setOnScroll(scrollEvent -> { | ||
| double deltaY = scrollEvent.getDeltaY() * deltaYMultiplier; | ||
| double fullHeight = getContent().getBoundsInLocal().getHeight(); | ||
| double visibleHeight = getBoundsInLocal().getHeight(); | ||
| double heightDiff = fullHeight - visibleHeight; | ||
| double diff = heightDiff > 1 ? heightDiff : 1; | ||
| setVvalue(getVvalue() - deltaY / diff); | ||
| }); | ||
| } | ||
|
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| /** | ||
| * Sets the vertical scroll amount's multiplier. Any value below BASE_DELTA_Y_MULTIPLIER | ||
| * will slow it down whereas any value above will accelerate it. In all cases however, | ||
| * the speed will be faster than the default one used inside a standard ScrollPane. | ||
| * @param deltaYMultiplier the multiplier used to multiply the deltaY | ||
| */ | ||
| public void setDeltaYMultiplier(double deltaYMultiplier) { | ||
| this.deltaYMultiplier = deltaYMultiplier; | ||
| } | ||
| } |
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