Autoboxing/Autounboxing

Transcription

1 Autoboxing

2 Autoboxing/Autounboxing public static void main(string args[]) { int dim=10; Pila<Integer> s=new Pila(); // s= new Coda(); for (int k=0;k<dim;k++){ //Integer o=new Integer(k); //s.inserisci(o); s.inserisci(k); for (int k=0;k<3*dim;k++) { //int j= Integer.parseInt(s.estrai()); int j= s.estrai(); System.out.println(j);

3 Even/ di tas/era

4 Un app con due bo7oni public class Keyboard1 extends Application {! int counter=0;!!! public void start(stage stage) {! TilePane box=new TilePane();! box.sethgap(50);! final Button b1=new Button("Uno");! final Button b2=new Button("Due");!!! box.getchildren().addall(b1,b2);! EventHandler actionhandler=new EventHandler(){! public void handle(event t) {! System.out.println((counter++)+!!!!!!!((Button)(t.getTarget())).getText());! ;!!!!b1.addeventhandler(actionevent.action, actionhandler);! b2.addeventhandler(actionevent.action, actionhandler);!! 0Uno 1Uno 2Uno 3Uno

5 che ca7ura gli even/ di keyboard! EventHandler<KeyEvent> keyeventhandler =! new EventHandler<KeyEvent>() {! public void handle(keyevent keyevent) {! if (keyevent.getcode() == KeyCode.U) {! b1.fireevent(new ActionEvent());! System.out.println(keyEvent.getSource()!!!!!!!!!!+" => "+keyevent.gettarget());!!!!!!!!!!! ;!! Scene scene = new Scene(box, 400, 300);! b1.addeventhandler(keyevent.key_pressed, keyeventhandler);! stage.settitle("my JavaFX Application");! stage.setscene(scene);! stage.show();! public static void main(string[] args) {! Application.launch(args);! Bu7on[id=null, styleclass=bu7on] => Bu7on[id=null, styleclass=bu7on]

6 ma funziona? SI! NO!

7 Sistemiamola. EventHandler<KeyEvent> keyeventhandler =! new EventHandler<KeyEvent>() {! public void handle(keyevent keyevent) {! if (keyevent.getcode() == KeyCode.U) {! b1.fireevent(new ActionEvent());! System.out.println(keyEvent.getSource()!!!!!!!!!!+" => "+keyevent.gettarget());!!!!!!!!! ;!! Scene scene = new Scene(box, 400, 300);!!! //b1.addeventhandler(keyevent.key_pressed, keyeventhandler);!! stage.addeventhandler(keyevent.key_pressed, keyeventhandler);!! stage.settitle("my JavaFX Application");!!! stage.setscene(scene);! stage.show();! javafx.scene.scene@68a08ca7 => Bu7on[id=null, styleclass=bu7on]

8 Ora ges/amo anche l'altro bo7one. EventHandler<KeyEvent> keyeventhandler =! new EventHandler<KeyEvent>() {! public void handle(final KeyEvent keyevent) {! System.out.println(keyEvent.getSource()+"!!!!!!!!!!=> "+keyevent.gettarget());!! switch (keyevent.getcode()){!! ;! case U:! case DIGIT1:! b1.fireevent(new ActionEvent());! break;! case D:! case DIGIT2:! b2.fireevent(new ActionEvent());! break;!

9 Events User Action Event Type Class User Action Event Type Class Key on the keyboard is pressed. KeyEvent Node, Scen e Zoom gesture is performed on an object ZoomEvent Node, Scene Mouse is moved or a button on the mouse is pressed. MouseEvent Node, Scen e Context menu is requested ContextMenuEvent Node, Scene Full mouse press-dragrelease action is performed. Input from an alternate method for entering characters (typically for a foreign language) is generated, changed, removed, or committed. Platform-supported drag and drop action is performed. MouseDragEvent Node, Scen e InputMethodEve nt DragEvent Node, Scen e Node, Scen e Object is scrolled. ScrollEvent Node, Scen e Rotation gesture is performed on an object Swipe gesture is performed on an object RotateEvent SwipeEvent Node, Scen e Node, Scen e An object is touched TouchEvent Node, Scen e Zoom gesture is performed on an object! ZoomEvent Node, Scen e Button is pressed, combo box is shown or hidden, or a menu item is selected. Item in a list, table, or tree is edited. Media player encounters an error. Menu is either shown or hidden. Popup window is hidden. Tab is selected or closed. Window is closed, shown, or hidden.! ActionEvent ListView.EditEvent TableColumn.CellEdi tevent TreeView.EditEvent MediaErrorEvent Event Event Event WindowEvent ButtonBase,Com boboxbase,cont extmenu,menuit em, TextField ListView TableColumn TreeView MediaView Menu PopupWindow Tab Window

10 Event chain - 1 public class EventFilterDemo extends Application { public void start(final Stage stage) { ; EventHandler handler=new EventHandler<ActionEvent>() public void handle(actionevent t) { EventTarget target=t.gettarget(); Object source=t.getsource(); String id=null; if (source instanceof Node { id=((node)source).getid(); else if (source instanceof Stage) { id="stage"; else if (source instanceof Scene) { else { id="scene"; System.out.println("Unrecognized Object"+source); System.out.println("HANDLER:"+id+" "+source+" ==> " +target);

11 Event chain - 2 EventHandler filter=new EventHandler<ActionEvent>() ; public void handle(actionevent t) { EventTarget target=t.gettarget(); Object source=t.getsource(); String id=null; if (source instanceof Node { id=((node)source).getid(); else if (source instanceof Stage) { id="stage"; else if (source instanceof Scene) { else { id="scene"; System.out.println("Unrecognized Object"+source); System.out.println("FILTER:"+id+" "+source+" ==> " +target);

12 Event chain - 2 EventHandler filter=new EventHandler<ActionEvent>() ; public void handle(actionevent t) { EventTarget target=t.gettarget(); Object source=t.getsource(); String id=null; if (source instanceof Node { id=((node)source).getid(); else if (source instanceof Stage) { id="stage"; else if (source instanceof Scene) { else { id="scene"; System.out.println("Unrecognized Object"+source); System.out.println("FILTER:"+id+" "+source+" ==> " +target);

13 Event chain - 3 TilePane layout=new TilePane(); Button button=new Button("Uno"); Button button2=new Button("DUE"); layout.getchildren().addall(button,button2); Scene scene = new Scene(layout); layout.setid("stackpane"); button.setid("button"); button.setid("button2"); scene.addeventfilter(actionevent.action,filter); scene.addeventhandler(actionevent.action,handler); stage.addeventfilter(actionevent.action,filter); stage.addeventhandler(actionevent.action,handler); layout.addeventfilter(actionevent.action,filter); layout.addeventhandler(actionevent.action,handler); button2.addeventfilter(actionevent.action,filter); button2.addeventhandler(actionevent.action,handler); button.addeventfilter(actionevent.action,filter); button.addeventhandler(actionevent.action,handler); stage.setscene(scene); stage.show(); public static void main(string[] args) { Application.launch(args);

14 Output FILTER:STAGE ==> BuDon[id=BUTTON- 1, styleclass=budon] FILTER:SCENE ==> BuDon[id=BUTTON- 1, styleclass=budon] FILTER:STACKPANE TilePane[id=STACKPANE, styleclass=root] ==> BuDon[id=BUTTON- 1, styleclass=budon] FILTER:BUTTON- 1 BuDon[id=BUTTON- 1, styleclass=budon] ==> BuDon[id=BUTTON- 1, styleclass=budon] HANDLER:BUTTON- 1 BuDon[id=BUTTON- 1, styleclass=budon] ==> BuDon[id=BUTTON- 1, styleclass=budon] HANDLER:STACKPANE TilePane[id=STACKPANE, styleclass=root] ==> BuDon[id=BUTTON- 1, styleclass=budon] HANDLER:SCENE javafx.scene.scene@b30e9f8 ==> BuDon[id=BUTTON- 1, styleclass=budon] HANDLER:STAGE javafx.stage.stage@7c1031ba ==> BuDon[id=BUTTON- 1, styleclass=budon] FILTER:STAGE javafx.stage.stage@7c1031ba ==> BuDon[id=BUTTON- 2, styleclass=budon] FILTER:SCENE javafx.scene.scene@b30e9f8 ==> BuDon[id=BUTTON- 2, styleclass=budon] FILTER:STACKPANE TilePane[id=STACKPANE, styleclass=root] ==> BuDon[id=BUTTON- 2, styleclass=budon] FILTER:BUTTON- 2 BuDon[id=BUTTON- 2, styleclass=budon] ==> BuDon[id=BUTTON- 2, styleclass=budon] HANDLER:BUTTON- 2BuDon[id=BUTTON- 2, styleclass=budon] ==> BuDon[id=BUTTON- 2, styleclass=budon] HANDLER:STACKPANE TilePane[id=STACKPANE, styleclass=root] ==> BuDon[id=BUTTON- 2, styleclass=budon] HANDLER:SCENE javafx.scene.scene@b30e9f8 ==> BuDon[id=BUTTON- 2, styleclass=budon] HANDLER:STAGE javafx.stage.stage@7c1031ba ==> BuDon[id=BUTTON- 2, styleclass=budon]

15 Event chain v.2-1 public void start(final Stage stage) { class SuperHandler<T extends Event> implements EventHandler<T>{ ; SuperHandler() { super(); protected EventTarget target; protected Object source; protected String public void handle(t t) { target=t.gettarget(); source=t.getsource(); id=null; if (source instanceof Node) { id=((node)source).getid(); else if (source instanceof Stage) { id="stage"; else if (source instanceof Scene) { else { id="scene"; System.out.println("Unrecognized Object"+source);

16 Event chain v.1-1 public class EventFilterDemo extends Application { public void start(final Stage stage) { ; EventHandler handler=new EventHandler<ActionEvent>() public void handle(actionevent t) { EventTarget target=t.gettarget(); Object source=t.getsource(); String id=null; if (source instanceof Node { id=((node)source).getid(); else if (source instanceof Stage) { id="stage"; else if (source instanceof Scene) { else { id="scene"; System.out.println("Unrecognized Object"+source); System.out.println("HANDLER:"+id+" "+source+" ==> " +target);

17 Event chain v.2 2b SuperHandler<ActionEvent> filter=new SuperHandler<ActionEvent>() { public void handle(actionevent t) { ; super.handle(t); System.out.println("FILTER:"+id+" "+source+" ==> "+target); SuperHandler<ActionEvent> handler=new SuperHandler<ActionEvent>() { ; public void handle(actionevent t) { super.handle(t); System.out.println("HANDLER:"+id+" "+source+" ==> "+target);

18 Event chain cu7er 1 SuperHandler<ActionEvent> filter=new SuperHandler<ActionEvent>() { public void handle(actionevent t) { ; super.handle(t); System.out.println("FILTER:"+id+" "+source+" ==> "+target); SuperHandler<ActionEvent> handler=new SuperHandler<ActionEvent>() { ; public void handle(actionevent t) { super.handle(t); System.out.println("HANDLER:"+id+" "+source+" ==> "+target); SuperHandler<ActionEvent> cutter=new SuperHandler<ActionEvent>() { public void handle(actionevent t) { super.handle(t); System.out.println("CUTTER:"+id+" "+source+" ==> "+target); t.consume(); ;

19 Event chain cu7er 2 scene.addeventfilter(actionevent.action,filter); scene.addeventhandler(actionevent.action,handler); stage.addeventfilter(actionevent.action,filter); stage.addeventhandler(actionevent.action,handler); layout.addeventfilter(actionevent.action,cutter); layout.addeventhandler(actionevent.action,handler); button.addeventfilter(actionevent.action,cutter); button.addeventhandler(actionevent.action,handler); FILTER:STAGE javafx.stage.stage@7c1031ba ==> BuDon[id=BUTTON- 1, styleclass=budon] FILTER:SCENE javafx.scene.scene@b30e9f8 ==> BuDon[id=BUTTON- 1, styleclass=budon] CUTTER:STACKPANE TilePane[id=STACKPANE, styleclass=root] ==> BuDon[id=BUTTON- 1, styleclass=budon]

20 Event chain cu7er 2b scene.addeventfilter(actionevent.action,filter); scene.addeventhandler(actionevent.action,handler); stage.addeventfilter(actionevent.action,filter); stage.addeventhandler(actionevent.action,handler); layout.addeventfilter(actionevent.action, filter); layout.addeventhandler(actionevent.action,cutter); button.addeventfilter(actionevent.action, filter); button.addeventhandler(actionevent.action,cutter); FILTER:STAGE ==> BuDon[id=BUTTON- 1, styleclass=budon] FILTER:SCENE ==> BuDon[id=BUTTON- 1, styleclass=budon] FILTER:STACKPANE TilePane[id=STACKPANE, styleclass=root] ==> BuDon[id=BUTTON- 1, styleclass=budon] FILTER:BUTTON- 1 BuDon[id=BUTTON- 1, styleclass=budon] ==> BuDon[id=BUTTON- 1, styleclass=budon] CUTTER:BUTTON- 1 BuDon[id=BUTTON- 1, styleclass=budon] ==> BuDon[id=BUTTON- 1, styleclass=budon]

21 Monitoraggio di una variabile E' possibile che se il valore di una variabile cambia succeda qualcosa?

22 Polling In un ciclo, in un'altra thread, con/nuo a leggerne il valore finché non cambia

23 Soluzione 2 Usando proprietà osservabili.

24

25 Proprietà variabile (nascosta): p Proprietà: p metodi: getp() setp( ) getpproperty() es: centerx es: getcenterx() es: setcenterx( ) es: getcenterxproperty() la variabile nascosta potrebbe essere read- only!

26 Un esempio di proprietà: amountdue package propertydemo; import javafx.beans.property.doubleproperty; import javafx.beans.property.simpledoubleproperty; class Bill { // Define a variable to store the property private DoubleProperty amountdue = new SimpleDoubleProperty(); // Define a ge7er for the property's value public final double getamountdue(){return amountdue.get(); // Define a se7er for the property's value public final void setamountdue(double value){amountdue.set(value); // Define a ge7er for the property itself public DoubleProperty amountdueproperty() {return amountdue; (Esempio di Sco7 Hammel, Oracle) h7p://docs.oracle.com/javafx/2/api/index.html?javafx/beans/property/doubleproperty.html

27 Conce7o di Observable An Observable is an en/ty that wraps content and allows to observe the content for invalida/ons. Tiene una lista di ascoltatori all'interno del metodo set deve lanciare l'evento di changed o di invalidated changed(observablevalue<? extends T> observable, T oldvalue, T newvalue) This method needs to be provided by an implementa/on of ChangeListener.

28 Ridimensionamento della finestra

29 Ca7ura gli even/ di resize della scena public class WindowResize extends Application {! public void start(stage stage) {!!!! Node circ = new Circle(40, 40, 30);! Parent root = new Group(circ);! Scene scene = new Scene(root, 400, 300);! scene.widthproperty().addlistener(new ChangeListener<Number>() {! public void changed(observablevalue<? extends Number>! observableval, Number oldwidth, Number newwidth) {! System.out.println("Width: " + newwidth); );! scene.heightproperty().addlistener(new ChangeListener<Number>() {! public void changed(observablevalue<? extends Number>! observableval, Number oldheight, Number newheight) {! System.out.println("Height: " + newheight); );! stage.setscene(scene);! stage.show();!

30 PLAF Pluggable Look And Feel in JavaFX "Skinning" (with CSS) h7p://docs.oracle.com/javase/8/javafx/user- interface- tutorial/css_tutorial.htm