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package ensemble.samples.controls.scrollbar;
import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.geometry.Orientation;
import javafx.scene.Group;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.ScrollBar;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
/**
* A sample showing horizontal and vertical scroll bars.
*
* @sampleName ScrollBar
* @preview preview.png
* @see javafx.scene.control.ScrollBar
* @embedded
*/
public class ScrollBarApp extends Application {
private Circle circle;
private ScrollBar xscrollBar;
private ScrollBar yscrollBar;
private double xscrollValue=0;
private double yscrollValue=15;
private static final int xBarWidth = 393;
private static final int xBarHeight = 15;
private static final int yBarWidth = 15;
private static final int yBarHeight = 393;
private static final int circleRadius = 90;
public Parent createContent() {
Rectangle bg = new Rectangle(xBarWidth+yBarWidth,xBarHeight+yBarHeight,Color.rgb(90,90,90));
Rectangle box = new Rectangle (100,100,Color.rgb(150,150,150));
box.setTranslateX(147);
box.setTranslateY(147);
//create moveable circle
circle = new Circle(45,45, circleRadius, Color.rgb(90,210,210));
circle.setOpacity(0.4);
circle.relocate(0,15);
//create horizontal scrollbar
xscrollBar = horizontalScrollBar(-1,-1,xBarWidth,xBarHeight,xBarWidth,xBarHeight);
xscrollBar.setUnitIncrement(20.0);
xscrollBar.valueProperty().addListener((ObservableValue observable, Number oldValue, Number newValue) -> {
//changes the x position of the circle
setScrollValueX(xscrollBar.getValue(), circle);
});
//create vertical scrollbar
yscrollBar = verticalScrollBar(-1,-1,yBarWidth,yBarHeight,yBarWidth,yBarHeight);
yscrollBar.setUnitIncrement(20.0);
yscrollBar.valueProperty().addListener((ObservableValue observable, Number oldValue, Number newValue) -> {
//changes the y position of the circle
setScrollValueY(yscrollBar.getValue(), circle);
});
//shift position of vertical scrollbar to right side of scene
yscrollBar.setTranslateX(yBarHeight);
yscrollBar.setTranslateY(yBarWidth);
yscrollBar.setOrientation(Orientation.VERTICAL);
Group group = new Group();
group.getChildren().addAll(bg, box, circle, xscrollBar, yscrollBar);
return group;
}
//Create a ScrollBar with given parameters
private ScrollBar horizontalScrollBar(double minw, double minh, double prefw, double prefh, double maxw, double maxh) {
final ScrollBar scrollBar = new ScrollBar();
scrollBar.setMinSize(minw, minh);
scrollBar.setPrefSize(prefw, prefh);
scrollBar.setMaxSize(maxw, maxh);
scrollBar.setVisibleAmount(50);
scrollBar.setMax(xBarWidth-(2*circleRadius));
return scrollBar;
}
//Create a ScrollBar with given parameters
private ScrollBar verticalScrollBar(double minw, double minh, double prefw, double prefh, double maxw, double maxh) {
final ScrollBar scrollBar = new ScrollBar();
scrollBar.setMinSize(minw, minh);
scrollBar.setPrefSize(prefw, prefh);
scrollBar.setMaxSize(maxw, maxh);
scrollBar.setVisibleAmount(50);
scrollBar.setMax(yBarHeight-(2*circleRadius));
return scrollBar;
}
//Updates x values
private void setScrollValueX(double v, Circle circle) {
this.xscrollValue = v;
circle.relocate(xscrollValue, yscrollValue);
}
//Updates x values
private void setScrollValueY(double v, Circle circle) {
this.yscrollValue = v+xBarHeight;
circle.relocate(xscrollValue, yscrollValue);
}
@Override
public void start(Stage primaryStage) throws Exception {
primaryStage.setScene(new Scene(createContent()));
primaryStage.show();
}
/**
* Java main for when running without JavaFX launcher
* @param args command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
