I have a JavaFX program in which I am looking to assign an event handler for a button but I want the event to trigger an action in a parent unit.
I have a GridPane as my main pane.
When I start my program, I have another Group of shapes (Called a Block) embedded in this gridpane at a fixed location (0,0).
As part of my Block, I have a Triangle button called DownArrow. My Plan is that when this button is pressed, the Doc controller will place a new Block beneath the one where the triangle was pressed.
I am looking at using the DownArrow.setOnMouseClicked event handler and map this back to the routine in the Controller to Add a new Block... However, I need some sort of info callback to let the controller know what Block was pressed.
I'm Stumped.
I was looking at maybe creating a custom event handler that I can pass more parameters but it seems clumsy - is there something else I should be doing?
How to pass paremeter with an event in javafx?
See Code Below in full:
package editorscratchpad;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.*;
import javafx.scene.text.Font;
import javafx.stage.Stage;
/**
*
* @author a_curley
*/
public class EditorScratchPad extends Application {
HBox mainPanel;
VBox flowChart;
GridPane flowchartGrid;
VBox controlPanel;
Integer stepCount;
TextField descData;
@Override
public void start(Stage primaryStage) {
Button btn = new Button();
descData = new TextField();
stepCount = 0;
btn.setText("Add Step");
btn.setOnAction((ActionEvent event) -> {
buttonClicked(event);
});
ScrollPane sp = new ScrollPane();
mainPanel = new HBox(20);
//mainPanel.setPrefWidth(400);
controlPanel = new VBox(5);
controlPanel.setAlignment(Pos.CENTER);
flowChart = new VBox();
flowChart.setPrefWidth(600);
flowChart.setAlignment(Pos.CENTER);
flowchartGrid = new GridPane();
flowchartGrid.setPrefWidth(600);
flowchartGrid.setHgap(10);
flowchartGrid.setVgap(10);
flowchartGrid.setPadding(new Insets(0, 10, 0, 10));
//sp.setContent(flowChart);
sp.setContent(flowchartGrid);
controlPanel.getChildren().add(btn);
controlPanel.getChildren().add(descData);
mainPanel.getChildren().add(sp);
mainPanel.getChildren().add(controlPanel);
Scene scene = new Scene(mainPanel, 800, 500);
primaryStage.sizeToScene();
primaryStage.setTitle("Flow chart");
primaryStage.setScene(scene);
primaryStage.show();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
public void buttonClicked(ActionEvent event) {
//Integer Step = stepCount*10;
//Integer Step = (flowChart.getChildren().size()+1)*10;
Integer Step = (flowchartGrid.getChildren().size() + 1);
String stateDesc = descData.getText();
if (stateDesc.length() < 3) {
stateDesc = "State " + Step.toString();
}
blockComponent newBlock = new blockComponent("S" + Integer.toString(Step * 10), stateDesc, Step); //<<<< Create the Block.
//flowChart.getChildren().add(newBlock.getComponent());
flowchartGrid.add(newBlock.getComponent(), 0, Step);
System.out.println("Added S" + Integer.toString(Step * 10));
stepCount++;
}
public void addNewBlock(ActionEvent event) {
Integer Step = (flowchartGrid.getChildren().size() + 1);
String stateDesc = "Step " + Integer.toString(Step * 10);
}
/**
* Subclass representing a Block Graphics only.
*/
public class blockComponent {
String Name;
String Desc;
Integer StateNo;
Integer XLoc;
Integer YLoc;
Integer blockHeight;
Integer blockWidth;
Integer stLabRad;
public blockComponent(String newName, String newDesc, Integer newSt) {
Name = newName;
Desc = newDesc;
StateNo = newSt;
XLoc = 0;
YLoc = 0;
blockHeight = 60;
blockWidth = 120;
stLabRad = 10;
}
public blockComponent(String newName, String newDesc, Integer newSt, Integer xCoOrd, Integer yCoOrd) {
this(newName, newDesc, newSt);
XLoc = xCoOrd;
YLoc = yCoOrd;
}
public Group getComponent() {
Group thisGroup = new Group();
// Define Rectangle
Rectangle Block = new Rectangle();
Block.setY(stLabRad);
Block.setX(stLabRad);
Block.setHeight(blockHeight);
Block.setWidth(blockWidth);
Block.setStroke(Color.BLACK);
Block.setStrokeWidth(2);
Block.setFill(Color.WHITESMOKE);
// Define state label
Circle stLab = new Circle();
stLab.setCenterX(stLabRad);
stLab.setCenterY(stLabRad);
stLab.setRadius(stLabRad);
stLab.setStroke(Color.PALEGREEN);
stLab.setFill(Color.PALEGREEN);
// Define State No.
Label stNo = new Label();
stNo.setFont(Font.font("Impact"));
stNo.setTextFill(Color.WHITE);
stNo.setLayoutX(0);
stNo.setLayoutY(0);
stNo.setText(StateNo.toString());
// Define the description
Label stD = new Label();
stD.setFont(Font.font("Impact"));
stD.setTextFill(Color.BLACK);
stD.setLayoutX(15);
stD.setLayoutY(15);
stD.setText(Desc.toString());
//---- Three Triangles for drawing. ----
// Down Arrow
Polygon downArrow = new Polygon();
downArrow.getPoints().addAll(new Double[]{
//X //Y
(blockWidth.doubleValue() / 2) + stLabRad, (blockHeight.doubleValue()),
((blockWidth.doubleValue() / 2) + 10) + stLabRad, (blockHeight.doubleValue() - 10),
((blockWidth.doubleValue() / 2) - 10) + stLabRad, (blockHeight.doubleValue() - 10)
// 70.0,60.0,
// 60.0,50.0,
// 80.0,50.0
});
downArrow.setStroke(Color.BLACK);
downArrow.setStrokeWidth(1);
downArrow.setFill(Color.LIGHTCYAN);
downArrow.setOnMouseEntered(new EventHandler<MouseEvent>() {
public void handle(MouseEvent me) {
downArrow.setStroke(Color.BLACK);
downArrow.setFill(Color.LIGHTCYAN);
}
});
downArrow.setOnMouseExited(new EventHandler<MouseEvent>() {
public void handle(MouseEvent me) {
downArrow.setStroke(Color.WHITESMOKE);
downArrow.setFill(Color.WHITESMOKE);
}
});
// try: https://stackoverflow.com/questions/35372236/how-to-pass-paremeter-with-an-event-in-javafx
//add all components to the group to display
thisGroup.getChildren().add(Block);
thisGroup.getChildren().add(stD);
thisGroup.getChildren().add(stLab);
thisGroup.getChildren().add(stNo);
thisGroup.getChildren().add(downArrow);
return thisGroup;
}
}
}
