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package graphical.core;

import java.lang.reflect.Field;

import java.util.Set;

import com.sun.javafx.scene.control.skin.ScrollPaneSkin;

import javafx.beans.Observable;

import javafx.scene.Node;

import javafx.scene.control.ContextMenu;

import javafx.scene.control.MenuItem;

import javafx.scene.control.ScrollBar;

import javafx.scene.control.ScrollPane;

import javafx.scene.control.SeparatorMenuItem;

import javafx.scene.control.Skin;

import javafx.scene.layout.Background;

import javafx.scene.layout.Priority;

import javafx.scene.layout.StackPane;

import javafx.scene.layout.VBox;

/**

 *

 * @author XiaHui

 */

public class ListRootPanel extends VBox {

public VBox box = new VBox();

ScrollPane scrollPane = new ScrollPane();

public ListRootPanel() {

initComponent();

iniEvent();

}

private void initComponent() {

scrollPane.setContent(box);

scrollPane.setPannable(true);

scrollPane.setStyle("-fx-background-color:rgba(255,255,255,0)");

scrollPane.setBackground(Background.EMPTY);

scrollPane.setHbarPolicy(ScrollPane.ScrollBarPolicy.NEVER);

scrollPane.setVbarPolicy(ScrollPane.ScrollBarPolicy.ALWAYS);

scrollPane.widthProperty().addListener((Observable observable) -> {

box.setPrefWidth(getWidth());

});

getChildren().add(scrollPane);

setUnitIncr();

}

private void iniEvent() {

setMouseTransparent(false);

setOnMouseDragged(v->{

v.consume();

});

box.setOnMouseDragged(v->{

v.consume();

});

scrollPane.setOnMouseDragged(v->{

v.consume();

});

}

public void addNode(Node node) {

if (!box.getChildren().contains(node)) {

box.getChildren().add(node);

}

}

public void addNode(int index, Node node) {

if (box.getChildren().contains(node)) {

box.getChildren().remove(node);

}

if(!box.getChildren().contains(node)){

box.getChildren().add(index,node);

}

}

public void removeNode(Node node) {

box.getChildren().remove(node);

}

public void removeNode(int index) {

box.getChildren().remove(index);

}

public void clearNode() {

box.getChildren().clear();

}

public int nodeSize() {

return box.getChildren().size();

}

private void setUnitIncr() {

try {

Skin<?> skin = scrollPane.getSkin();

if (skin instanceof ScrollPaneSkin) {

Field field = skin.getClass().getDeclaredField("vsb");

if (null != field) {

field.setAccessible(true);

ScrollBar scrollBar = (ScrollBar) field.get(skin);

field.setAccessible(false);

scrollBar.setUnitIncrement(20.0);

}

field = skin.getClass().getDeclaredField("hsb");

if (null != field) {

field.setAccessible(true);

ScrollBar scrollBar = (ScrollBar) field.get(skin);

field.setAccessible(false);

scrollBar.setUnitIncrement(20.0);

}

}

} catch (final Exception e) {

e.printStackTrace();

}

Set<Node> nodes = lookupAll(".scroll-bar");

if (null != nodes) {

for (Node node : nodes) {

if (node instanceof ScrollBar) {

ScrollBar sb = (ScrollBar) node;

sb.setUnitIncrement(20.0);

}

}

}

}

}

为什么滚动条不能滚动，反而随着VBox的高而变长？