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improves on https://stackoverflow.com/questions/55076613/javafx-resiz…
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…e-children-relative-to-parent
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@WolfgangFahl
WolfgangFahl committed Mar 9, 2019
1 parent d2e9118 commit 2654574
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371 changes: 208 additions & 163 deletions src/main/java/com/bitplan/javafx/RubberBandSelection.java
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Original file line number Diff line number Diff line change
Expand Up @@ -25,11 +25,13 @@
*/
package com.bitplan.javafx;

import java.util.ArrayList;
import java.util.List;
import java.util.HashMap;
import java.util.Map;

import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.geometry.BoundingBox;
import javafx.geometry.Bounds;
import javafx.scene.Group;
import javafx.scene.Node;
import javafx.scene.Parent;
Expand All @@ -42,171 +44,214 @@

/**
* RubberBandSelection
* @author Roland
* see
* https://stackoverflow.com/questions/30295071/how-to-create-stackpane-on-the-drawn-rectangle-area
*
* @author Roland see
* https://stackoverflow.com/questions/30295071/how-to-create-stackpane-on-the-drawn-rectangle-area
*
* @author wf
*
*/
public class RubberBandSelection {


/**
*
*/
final DragContext dragContext = new DragContext();
Rectangle rect;
List<Node> selected=new ArrayList<Node>();
Parent parent;
private boolean selectButton=false;

public boolean isSelectButton() {
return selectButton;
}

public void setSelectButton(boolean selectButton) {
this.selectButton = selectButton;
}

/**
* construct me for the given
* @param parent
*/
public RubberBandSelection(Parent parent) {

this.parent = parent;

rect = new Rectangle(0, 0, 0, 0);
rect.setStroke(Color.BLUE);
rect.setStrokeWidth(1);
rect.setStrokeLineCap(StrokeLineCap.ROUND);
rect.setFill(Color.LIGHTBLUE.deriveColor(0, 1.2, 1, 0.6));

parent.addEventHandler(MouseEvent.MOUSE_PRESSED,
onMousePressedEventHandler);
parent.addEventHandler(MouseEvent.MOUSE_DRAGGED,
onMouseDraggedEventHandler);
parent.addEventHandler(MouseEvent.MOUSE_RELEASED,
onMouseReleasedEventHandler);
}

EventHandler<MouseEvent> onMousePressedEventHandler = new EventHandler<MouseEvent>() {

@Override
public void handle(MouseEvent event) {
dragContext.mouseAnchorX = event.getSceneX();
dragContext.mouseAnchorY = event.getSceneY();

rect.setX(dragContext.mouseAnchorX);
rect.setY(dragContext.mouseAnchorY);
rect.setWidth(0);
rect.setHeight(0);
add(rect);
}
};

EventHandler<MouseEvent> onMouseReleasedEventHandler = new EventHandler<MouseEvent>() {

@Override
public void handle(MouseEvent event) {

// get coordinates
double x = rect.getX();
double y = rect.getY();
double w = rect.getWidth();
double h = rect.getHeight();

if (isSelectButton()) {

// create button
Button button = new Button();
button.setDefaultButton(false);
button.setPrefSize(w, h);
button.setText("");
button.setStyle("-fx-border-color: blue;-fx-background-color: rgba(0,0,0, 0.3);");
button.setLayoutX(x);
button.setLayoutY(y);
button.setOnAction(e->{remove((Node) e.getSource());});
add(button);

} else {
// create rectangle
Rectangle node = new Rectangle(0, 0, w, h);
node.setStroke(Color.BLACK);
node.setFill(Color.BLACK.deriveColor(0, 0, 0, 0.3));
node.setLayoutX(x);
node.setLayoutY(y);
add(node);
}

// remove rubberband
rect.setX(0);
rect.setY(0);
rect.setWidth(0);
rect.setHeight(0);

remove(rect);

}
};

EventHandler<MouseEvent> onMouseDraggedEventHandler = new EventHandler<MouseEvent>() {

@Override
public void handle(MouseEvent event) {

double offsetX = event.getSceneX() - dragContext.mouseAnchorX;
double offsetY = event.getSceneY() - dragContext.mouseAnchorY;

if (offsetX > 0)
rect.setWidth(offsetX);
else {
rect.setX(event.getSceneX());
rect.setWidth(dragContext.mouseAnchorX - rect.getX());
}

if (offsetY > 0) {
rect.setHeight(offsetY);
} else {
rect.setY(event.getSceneY());
rect.setHeight(dragContext.mouseAnchorY - rect.getY());
}
}
};

private final class DragContext {

public double mouseAnchorX;
public double mouseAnchorY;

}

public ObservableList<Node> getChildren() {
if (parent instanceof Pane) {
return ((Pane)parent).getChildren();
} else if (parent instanceof Group) {
return ((Group)parent).getChildren();
} else {
return parent.getChildrenUnmodifiable();
}
}

/**
* add the given node
* @param node
*/
protected void add(Node node) {
getChildren().add(node);
this.selected.add(node);
}

/**
* remove the given node
* @param node
*/
protected void remove(Node node) {
getChildren().remove(node);
this.selected.remove(node);
}
/**
* remember the selection with it's relative bounds
*
* @author wf
*
*/
public class Selection {
Node node;
Bounds relativeBounds;

/**
* create a selection from the given
*
* @param node
* @param rect
*/
public Selection(Node node, Rectangle rect) {
Bounds pB = parent.getBoundsInParent();
this.node = node;
double rx = rect.getX() / pB.getWidth();
double ry = rect.getY() / pB.getHeight();
double rw = rect.getWidth() / pB.getWidth();
double rh = rect.getHeight() / pB.getHeight();
relativeBounds = new BoundingBox(rx, ry, rw, rh);
}

/**
* get a string with my relative positions in percent
* @return String with x,y,w,h formatted with
*/
public String asPercent() {
String pStr = String.format("x: %4.1f%% y: %4.1f%% w: %4.1f%% h: %4.1f%%", relativeBounds.getMinX()*100,
relativeBounds.getMinY()*100, relativeBounds.getHeight()*100, relativeBounds.getWidth()*100);
return pStr;
}
}

/**
*
*/
final DragContext dragContext = new DragContext();
Rectangle rect;
Map<Node, Selection> selected = new HashMap<Node, Selection>();

Parent parent;
private boolean selectButton = false;

public boolean isSelectButton() {
return selectButton;
}

public void setSelectButton(boolean selectButton) {
this.selectButton = selectButton;
}

/**
* construct me for the given
*
* @param parent
*/
public RubberBandSelection(Parent parent) {

this.parent = parent;

rect = new Rectangle(0, 0, 0, 0);
rect.setStroke(Color.BLUE);
rect.setStrokeWidth(1);
rect.setStrokeLineCap(StrokeLineCap.ROUND);
rect.setFill(Color.LIGHTBLUE.deriveColor(0, 1.2, 1, 0.6));

parent.addEventHandler(MouseEvent.MOUSE_PRESSED, onMousePressedEventHandler);
parent.addEventHandler(MouseEvent.MOUSE_DRAGGED, onMouseDraggedEventHandler);
parent.addEventHandler(MouseEvent.MOUSE_RELEASED, onMouseReleasedEventHandler);
}

EventHandler<MouseEvent> onMousePressedEventHandler = new EventHandler<MouseEvent>() {

@Override
public void handle(MouseEvent event) {
dragContext.mouseAnchorX = event.getSceneX();
dragContext.mouseAnchorY = event.getSceneY();

rect.setX(dragContext.mouseAnchorX);
rect.setY(dragContext.mouseAnchorY);
rect.setWidth(0);
rect.setHeight(0);
add(rect,rect,false);
}
};

EventHandler<MouseEvent> onMouseReleasedEventHandler = new EventHandler<MouseEvent>() {

@Override
public void handle(MouseEvent event) {

// get coordinates
double x = rect.getX();
double y = rect.getY();
double w = rect.getWidth();
double h = rect.getHeight();

if (isSelectButton()) {

// create button
Button button = new Button();
button.setDefaultButton(false);
button.setPrefSize(w, h);
button.setText("");
button.setStyle("-fx-border-color: blue;-fx-background-color: rgba(0,0,0, 0.3);");
button.setLayoutX(x);
button.setLayoutY(y);
button.setOnAction(e -> {
remove((Node) e.getSource(),true);
});
add(button,rect,true);

} else {
// create rectangle
Rectangle node = new Rectangle(0, 0, w, h);
node.setStroke(Color.BLACK);
node.setFill(Color.BLACK.deriveColor(0, 0, 0, 0.3));
node.setLayoutX(x);
node.setLayoutY(y);
add(node,node,false);
}

// remove rubberband
rect.setX(0);
rect.setY(0);
rect.setWidth(0);
rect.setHeight(0);

remove(rect,false);

}
};

EventHandler<MouseEvent> onMouseDraggedEventHandler = new EventHandler<MouseEvent>() {

@Override
public void handle(MouseEvent event) {

double offsetX = event.getSceneX() - dragContext.mouseAnchorX;
double offsetY = event.getSceneY() - dragContext.mouseAnchorY;

if (offsetX > 0)
rect.setWidth(offsetX);
else {
rect.setX(event.getSceneX());
rect.setWidth(dragContext.mouseAnchorX - rect.getX());
}

if (offsetY > 0) {
rect.setHeight(offsetY);
} else {
rect.setY(event.getSceneY());
rect.setHeight(dragContext.mouseAnchorY - rect.getY());
}
}
};

private final class DragContext {

public double mouseAnchorX;
public double mouseAnchorY;

}

public ObservableList<Node> getChildren() {
if (parent instanceof Pane) {
return ((Pane) parent).getChildren();
} else if (parent instanceof Group) {
return ((Group) parent).getChildren();
} else {
return parent.getChildrenUnmodifiable();
}
}

/**
* add the given node
*
* @param node
* @param rect
* @param remember
*/
protected void add(Node node, Rectangle rect, boolean remember) {
getChildren().add(node);
if (remember)
this.selected.put(node, new Selection(node,rect));
}

/**
* remove the given node
*
* @param node
*/
protected void remove(Node node, boolean remember) {
getChildren().remove(node);
if (remember)
this.selected.remove(node);
}
}

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