java可以将窗格的高度/宽度绑定到BorderPane的中心节点吗？
我有一个任务，要求我扩展pane类，然后在其上添加一个矩形。然后我填充矩形，并使用一些按钮来更改矩形的颜色。我将我的扩展窗格类添加到边框窗格的中心节点，但我设想矩形占据整个窗格，并绑定到窗格的高度和宽度，然后窗格又占据边框窗格的整个中心窗格，并绑定到中心窗格的高度和宽度。我应该制作一个窗格，然后将扩展窗格添加到窗格中，然后将窗格添加到边框窗格的中心窗格中吗？以下是我的全部代码。下面是我得到的图片
package homework;
import javafx.scene.shape.*;
import javafx.application.Application;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.Property;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.layout.Region;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
public class ColorSample extends Application{
@Override
public void start (Stage primaryStage) {
//Create border pane
BorderPane bp = new BorderPane();
//Create saturation buttons
Button btnMSat = new Button("More Saturated");
Button btnLSat = new Button("Less Saturated");
//Create hue buttons
Button btnHueU = new Button("Hue Up");
Button btnHueD = new Button("Hue Down");
//Create Darker/Brighter buttons
Button btnDark = new Button("Darker");
Button btnBright = new Button("Brighter");
//Create Top and bottom HBoxes
HBox THBox = new HBox(10);
THBox.setAlignment(Pos.CENTER);
HBox BHBox = new HBox(10);
BHBox.setAlignment(Pos.CENTER);
//Create ColorPane
Color color = Color.MEDIUMBLUE;
ColorPane cp = new ColorPane(color);
cp.setColor(color);
//Set Events
//More Saturation Clicked
btnMSat.setOnAction(e->{
cp.setColor(cp.moreSaturation(cp.getColor()));
});
//Less Saturation Clicked
btnLSat.setOnAction(e->{
cp.setColor(cp.lessSaturation(cp.getColor()));
});
//Hue Up Clicked
btnHueU.setOnAction(e->{
cp.setHue(cp.getColor(), 30);
});
//Hue Down Clicked
btnHueD.setOnAction(e->{
cp.setHue(cp.getColor(), -30);
});
//Darker Clicked
btnDark.setOnAction(e->{
cp.darker(cp.getColor());
});
//Brighter Clicked
btnDark.setOnAction(e->{
cp.brighter(cp.getColor());
});
//Add Saturation Buttons to Top HBox
THBox.getChildren().addAll(btnMSat, btnLSat);
bp.setTop(THBox);
//Add Darker/Lighter buttons to Bottom HBox
BHBox.getChildren().addAll(btnDark, btnBright);
bp.setBottom(BHBox);
//Create right side VBox
VBox RVBox = new VBox(10);
RVBox.setAlignment(Pos.CENTER);
//Add Hue buttons to right side VBox
RVBox.getChildren().addAll(btnHueU, btnHueD);
bp.setPrefSize(450, 325);
bp.setRight(RVBox);
//Add ColorPane to Border Panel
bp.setCenter(cp);
BorderPane.setAlignment(cp, Pos.CENTER);
//Create scene and add border pane to it
Scene scene = new Scene(bp, 525, 450);
primaryStage.setScene(scene);
primaryStage.show();
}
class ColorPane extends Pane {
Rectangle rectangle = new Rectangle();
ColorPane() {
//Set properties
rectangle.setX(0);
rectangle.setY(0);
//Bind width and height
rectangle.setWidth(USE_COMPUTED_SIZE);
rectangle.setHeight(USE_COMPUTED_SIZE);
getChildren().add(rectangle);
}
ColorPane(Color c) {
//Set properties
rectangle.setX(0);
rectangle.setY(0);
rectangle.setWidth(450);
rectangle.setHeight(450);
//Bind width and height
rectangle.widthProperty().bind(widthProperty());
rectangle.heightProperty().bind(heightProperty());
setColor(c);
rectangle.setStroke(c);
rectangle.setFill(c);
getChildren().add(rectangle);
}
@Override
public void setWidth(double w) {
super.setWidth(w);
}
@Override
public void setHeight(double h) {
super.setWidth(h);
}
public Color setHue(Color color, double h) {
double newHue = 0;
if(color.getHue() + h >= 360)
newHue = 360;
else if (color.getBlue() + h <= 0)
newHue = 0;
else
newHue+=h;
Color output = Color.hsb(newHue, color.getSaturation(),
color.getBrightness(), color.getOpacity());
return output;
}
public Color moreSaturation(Color color) {
double newSat = 0;
if (Math.pow(color.getSaturation(), 2) > 1)
newSat = 1;
else
newSat = Math.pow(color.getSaturation(), 2);
Color output = Color.hsb(color.getHue(), newSat,
color.getBrightness(), color.getOpacity());
return output;
}
public Color lessSaturation(Color color) {
double newSat = 0;
if (Math.sqrt(color.getSaturation()) > 0)
newSat = Math.sqrt(color.getSaturation());
Color output = Color.hsb(color.getHue(), newSat,
color.getBrightness(), color.getOpacity());
return output;
}
public Color darker(Color color) {
double brightness = 0;
if(Math.pow(color.getBrightness(), 2) >=1)
brightness =1;
else
brightness = Math.pow(color.getBrightness(), 2);
Color output = Color.hsb(color.getHue(), color.getSaturation(),
brightness, color.getOpacity());
return output;
}
public Color brighter(Color color) {
double brightness = 0;
if(Math.sqrt(color.getBrightness())>0)
brightness = Math.sqrt(color.getBrightness());
Color output = Color.hsb(color.getHue(), color.getSaturation(),
brightness, color.getOpacity());
return output;
}
public Color getColor() {
return (Color) rectangle.getFill();
}
public void setColor(Color c) {
rectangle.setStroke(c);
rectangle.setFill(c);
}
}
public static void main(String[] args) {
Application.launch(args);
}
}
# 1 楼答案
好的，在ColorPane构造函数中，我注释掉了绑定高度和宽度的线条，所以现在矩形出现了，但是当矩形从窗格的坐标0,0开始时（请参见构造函数），ColorPane本身并没有填充边框窗格的中心窗格。下面是截图和代码
# 2 楼答案
实际上，将颜色窗格的添加设置为BorderPane中心节点的左上角，然后将其添加到中心：
仍在努力找出调整大小时如何处理行为，但这要好得多