Semin r Java - GUIkoci/ija/prednasky/ija-gui.pdfpˇri vyvol an´ı ud´ alosti za´ sle systˇ em...
Transcript of Semin r Java - GUIkoci/ija/prednasky/ija-gui.pdfpˇri vyvol an´ı ud´ alosti za´ sle systˇ em...
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Seminar JavaGUI
Radek Kocı
Fakulta informacnıch technologiı VUT
Duben 2012
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Tema prednasky
GUI
Ukazkovy prıklad
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Graficke uzivatelske rozhranı
Swing
nove GUI dostupne od verze 1.2.x
soucast JFC (Java Foundation Classes)
konecna verze GUI pro Javu
AWT (Abstract Window Toolkit)
starsı varianta dostupna od verze 1.x.x
od verze 1.1.x udalostne rızena
omezene moznosti
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Graficke uzivatelske rozhranı
Balıcky
java.awt – zakladnı komponenty AWT GUI
java.awt.event – udalosti AWT GUI
+ dalsı balıky v java.awt
javax.swing – zakladnı komponenty Swing GUI
javax.swing.event – udalosti komponenty Swing GUI
+ dalsı balıky v javax.swing
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Graficke uzivatelske rozhranı
Rızenı programu udalostmi
obecnejsı pojem oznacujıcı typ asynchronnıho
programovanı
zakladnı princip tvorby GUI
tok programu je rızen udalostmi (zpracovanı udalostı
urcuje beh aplikace)
udalostnı aplikace by mely byt programovany jako
vıcevlaknove
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Tvorba GUI
Komponenty GUI
graficke (uzivatelske) elementy – tabulka, text, . . .
graficke kontejnery
Zakladnı prıstup
udalostnı rızenı
kontejnery obsahujı elementy a/nebo jine kontejnery
vzhled GUI je dan zpusobem poskladanı grafickych
elementu a kontejneru
http://download.oracle.com/javase/
tutorial/uiswing/components/
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Ukazka Swing aplikace
public class HelloWorld {
public static void main(String[] args) {
// vytvoreni okna aplikace
JFrame okno = new JFrame("Hello World");
// vytvoreni textu a vlozeni do okna
JLabel text = new JLabel("Nazdarek ...");
okno.getContentPane().add(label);
// implicitni operace pri zavreni okna
okno.setDefaultCloseOperation(
JFrame.EXIT_ON_CLOSE);
// otevreni okna
okno.pack();
okno.setVisible(true);
}
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Rozmıstenı komponent
Rozmıstenı komponent
komponenty se vkladajı do grafickych kontejneru
umıstenı komponenty nenı dano absolutnı polohou
umıstenı komponenty je vztazeno relativne ke kontejneru,
ve kterem je vlozena
zpusob umıstenı je dan spravcem umıstenı
velikost, tvar a rozmıstenı zavisı na typu spravcezalezı na poradı vlozenı (add())
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Spravce rozmıstenı
Nastavenı spravce rozmıstenı
v konstruktoru pri vytvarenı kontejneru
converterPanel =
new JPanel(new GridLayout(2, 2));
metodou setLayout() kontejneru
JFrame okno =
new JFrame("Hello World application");
okno.getContentPane().
setLayout(new FlowLayout());
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Spravce rozmıstenı
FlowLayout
komponenty jsou ukladany zleva doprava na jeden radek
pri zaplnenı radku se prechazı na novy radek
implicitnı
GridLayout
komponenty jsou ukladany do mrızky (tabulky)
komponenty jsou ukladany zleva doprava a shora dolu do
bunek mrızky
pocet sloupcu a radku se urcuje v konstruktoru
mrızka je rovnomerna
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Spravce rozmıstenı
GridBagLayout
nejmocnejsı (take nejslozitejsı) spravce umıstenı
o umıstenı prvku muzeme rozhodovat naprosto volne
vyuzıvan predevsım pri automatickem generovanı kodu
(RAD nastroje)
BoxLayout
vychazı z GridLayout
umoznuje vodorovne nebo svisle umıstenı
umoznuje nastavit roztece (mechanizmus ”rozpery a tmel”)
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Spravce rozmıstenı
BorderLayout
implicitne umistuje komponenty na stred a roztahuje na
celou velikost kontejneru
lze definovat oblast vlozenı v prepsane metode add()
BorderLayout.NORTH
BorderLayout.SOUTH
BorderLayout.EAST
BorderLayout.WEST
BorderLayout.CENTER (implicitnı)
Bez spravce
setLayout(null)
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Udalostnı programovanı
Rızenı programu udalostmi
udalost vznika obvykle uzivatelskou akcı (kliknutı, zmena
polohy mysi, . . . )
udalost muze vzniknout v libovolne komponente GUI
kazda komponenta ma definovaneho ”posluchace”
(listener) udalostı
pri vyvolanı udalosti zasle system zpravu posluchaci – ten
udalost zpracuje
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GUI – typy udalostı
Udalosti lze rozdelit podle uzivatelske akce nad
oknem – WindowEvent
klavesnicı – KeyEvent
mysı (klikanı, pohyb) – MouseEvent
fokusem (zıskanı, ztrata) – FocusEvent
GUI (obecna akce, napr. stisk tlacıtka) – ActionEvent
. . . (viz java.awt.event a java.swing.event)
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Udalostnı programovanı
Posluchac udalostı
objekt, jehoz trıda implementuje prıslusne rozhranı
Rozhranı posluchacu udalostı
ActionListener (awt)
MouseListener (awt)
MouseMotionListener (awt)
MouseInputListener (swing)
. . . (viz java.awt.event a java.swing.event)
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Udalostnı programovanı
Pridanı posluchace udalostı
komponenta musı registrovat posluchace udalostı, aby
prıslusna udalost mohla byt osetrena
kazda komponenta knihovny Swing obsahuje
metodu addXXXListener()
metodu removeXXXListener()
kde XXX reprezentuje nazev udalosti (Mouse, ...)
napr. addActionListener(ActionListener
listener)
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Udalostnı programovanı
Implementace posluchace udalostı
anonymnı trıda
vnitrnı trıda
top-level trıda
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Udalostnı programovanı
class myActionListener implements ActionListener {
public void actionPerformed(ActionEvent event) {
...
}
}
...
convertTemp = new JButton("Convert");
convertTemp.
addActionListener(new MyActionListener());
...
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Rozsırenı komponent
java.awt.Component
java.awt.Container
java.swing.JComponent
Trıda JComponent
metoda void paintComponent(Graphics g)
metoda void repaint()
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GUI a paralelismus
button.addActionListener(new DoSomething());
class DoSomething implements ActionListener {
public void actionPerformed(ActionEvent event) {
try {
Thread.sleep(10000);
} catch (InterruptedException e) {}
}
}
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GUI a paralelismus
class DoSomething implements ActionListener {
public void actionPerformed(ActionEvent event) {
Runnable r = new Runnable() {
public void run() {
label.setText("Time consuming operation");
try {
Thread.sleep(10000);
} catch (InterruptedException e) {}
label.setText("");
}
};
new Thread(r).start();
}
}
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GUI a paralelismus
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread
//creating and showing this application’s GUI.
javax.swing.SwingUtilities.
invokeLater(new Runnable()
{
public void run() {
createAndShowGUI();
}
});
}
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Reference
http://download.oracle.com/javase/
tutorial/uiswing/
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Technika navrhu
Zadanı:
Vytvorte aplikaci s GUI pro hanoiske veze.
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Analyza
Ilustracnı prıklad
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Analyza
Ilustracnı prıklad
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Analyza
Ilustracnı prıklad
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Analyza – Objektovy diagram
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Analyza – Diagram trıd
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Analyza – Diagram trıd
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Analyza – Diagram trıd
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Analyza – Diagram trıd
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Analyza – Diagram trıd
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Analyza – Diagram trıd
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Analyza – Diagram trıd
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