Išdėstymai. Lekt. dr. Pijus Kasparaitis m. m. pavasario semestras.
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1 Išdėstymai Lekt. dr. Pijus Kasparaitis m. m. pavasario semestras
2 Išdėstymo valdymas Java kalboje komponentų išdėstymą valdo programos kodas, o ne resursai (kaip kitose sistemose) Komponentai išdėstomi ne absoliučiose koordinatėse, tai nusako išdėstymo menedžeris Skirtinguose išdėstymo menedžeriuose išdėstoma skirtingai Keičiant lango dydį išdėstymas, forma, dydis kinta P.Kasparaitis. Objektinis programavimas. Apletai 2
3 BorderLayout išdėstymas //<applet code=borderlayout1 width=300 height=250> </applet> 1 import javax.swing.*; 2 import java.awt.*; 3 public class BorderLayout1 extends JApplet { 4 public void init() { 5 Container cp = getcontentpane(); 6 cp.add(borderlayout.north, new JButton("North")); 7 cp.add(borderlayout.south, new JButton("South")); 8 cp.add(borderlayout.east, new JButton("East")); 9 cp.add(borderlayout.west, new JButton("West")); 10 cp.add(borderlayout.center, new JButton("Center")); 11 } 12} P.Kasparaitis. Objektinis programavimas. Apletai 3
4 BorderLayout išdėstymas P.Kasparaitis. Objektinis programavimas. Apletai 4
5 FlowLayout išdėstymas // <applet code=flowlayout1 width=300 height=250> </applet> 1 import javax.swing.*; 2 import java.awt.*; 3 public class FlowLayout1 extends JApplet { 4 public void init() { 5 Container cp = getcontentpane(); 6 cp.setlayout(new FlowLayout()); 7 for(int i = 0; i < 20; i++) 8 cp.add(new JButton("Button " + i)); 9 } 10} P.Kasparaitis. Objektinis programavimas. Apletai 5
6 FlowLayout išdėstymas P.Kasparaitis. Objektinis programavimas. Apletai 6
7 GridLayout išdėstymas // <applet code=gridlayout1 width=300 height=250> </applet> 1 import javax.swing.*; 2 import java.awt.*; 3 public class GridLayout1 extends JApplet { 4 public void init() { 5 Container cp = getcontentpane(); 6 cp.setlayout(new GridLayout(7,3)); 7 for(int i = 0; i < 20; i++) 8 cp.add(new JButton("Button " + i)); 9 } 10} P.Kasparaitis. Objektinis programavimas. Apletai 7
8 GridLayout išdėstymas P.Kasparaitis. Objektinis programavimas. Apletai 8
9 BoxLayout išdėstymas 1 public class BoxLayout1 extends JApplet { 2 public void init() { 3 JPanel jpv = new JPanel(); 4 jpv.setlayout(new BoxLayout(jpv, BoxLayout.Y_AXIS)); 5 for(int i = 0; i < 5; i++) 6 jpv.add(new JButton("jpv " + i)); 7 JPanel jph = new JPanel(); 8 jph.setlayout(new BoxLayout(jph, BoxLayout.X_AXIS)); 9 for(int i = 0; i < 5; i++) 10 jph.add(new JButton("jph " + i)); 11 Container cp = getcontentpane(); 12 cp.add(borderlayout.east, jpv); 13 cp.add(borderlayout.south, jph); 14 } 15} P.Kasparaitis. Objektinis programavimas. Apletai 9
10 BoxLayout išdėstymas P.Kasparaitis. Objektinis programavimas. Apletai 10
11 Talpinimas absoliučiose koordinatėse 1 public class AbsPos extends JApplet { 2 public void init() { 3 JButton b1 = new JButton("Button 1"); 4 JButton b2 = new JButton("Button 2"); 5 JButton b3 = new JButton("Button 3"); 6 Container cp = getcontentpane(); 7 cp.setlayout(null); 8 b1.setbounds(10, 10, 120, 60); //(x,y,w,h) 9 cp.add(b1); 10 b2.setbounds(180, 30, 90, 120); 11 cp.add(b2); 12 b3.setbounds(30, 120, 120, 60); 13 cp.add(b3); 14 } 15} P.Kasparaitis. Objektinis programavimas. Apletai 11
12 Talpinimas absoliučiose koordinatėse P.Kasparaitis. Objektinis programavimas. Apletai 12
13 Grafika 1 class Piesinys extends Component { 2 public void paint(graphics g) { 3 g.drawrect(10,10,250,220); //(x,y,w,h) 4 g.setcolor(new Color(255, 0, 0)); 5 g.drawline(10,30,250,200); //(x1,y1,x2,y2) 6 g.drawoval(100,120,170,80); //(x,y,w,h) 7 } 8 } 9 public class Piesimas1 extends JApplet { 10 public void init() { 11 getcontentpane().add(new Piesinys()); 12 } 13} P.Kasparaitis. Objektinis programavimas. Apletai 13
14 Grafika P.Kasparaitis. Objektinis programavimas. Apletai 14
15 Swing įvykių modelis Komponentai gali generuoti įvykius Kiekvieno tipo įvykiui atstovauja skirtinga klasė, pvz., KeyEvent Įvykius gaudo ir apdoroja listener klasės (klausytojai), kurios realizuoja atitinkamus listener interfeisus, pvz., KeyListener Įvykius generuojantis komponentas ir įvykius apdorojanti listener klasė susiejami kviečiant komponento metodą addxxxlistener(xxxlistener), kur XXX įvykio tipas P.Kasparaitis. Objektinis programavimas. Apletai 15
16 Dar kartą apie anoniminės vidinės klasės panaudojimą įvykiams gaudyti 1 JButton b = new JButton( Button1 ); 2 b.addactionlistener(new ActionListener() { 3 public void actionperformed(actionevent e) { 4 //veiksmai 5 } 6 }); P.Kasparaitis. Objektinis programavimas. Apletai 16
17 Swing įvykių modelis Visi Swing komponentai turi atitinkamus addxxxlistener() ir removexxxlistener() metodus Konkrečias įvykių/klausytojų/metodų tipų reikšmes žr. kitoje skaidrėje Galima kurti savo įvykius/klausytojus P.Kasparaitis. Objektinis programavimas. Apletai 17
18 Įvykių/klausytojų/metodų tipai ir juos palaikantys komponentai *Action* *Adjustment* *Component* *Container* *Focus* *Key* JButton, JList, JTextField, JMenuItem (JMenu,...) Adjustable interface (JScrollbar) Component (JButton, JCheckBox, Container, JPanel, JApplet, JLabel, JTextArea, JTextField,...) Container (JPanel, JApplet, Window, JDialog, JFrame,...) Component (...) Component (...) P.Kasparaitis. Objektinis programavimas. Apletai 18
19 Įvykių/klausytojų/metodų tipai ir juos palaikantys komponentai *Mouse* *MouseMotion* *Window* *Item* *Text* Component (...) Component (...) Window (JDialog, JFrame,...) ItemSelectable interface (JCheckBox, JCheckBoxMenuItem, JComboBox, JList) JTextComponent (JTextArea, JTextField) P.Kasparaitis. Objektinis programavimas. Apletai 19
20 Listener interfeisų metodai ActionListener AdjustmentListener ComponentListener ComponentAdapter ContainerListener ContainerAdapter FocusListener FocusAdapter ItemListener actionperformed(actionevent) adjustmentvaluechanged( AdjustmentEvent) componenthidden(componentevent) componentshown(componentevent) componentmoved(componentevent) componentresized(componentevent) componentadded(containerevent) componentremoved(containerevent) focusgained(focusevent) focuslost(focusevent) itemstatechanged(itemevent) P.Kasparaitis. Objektinis programavimas. Apletai 20
21 Listener interfeisų metodai KeyListener KeyAdapter MouseListener MouseAdapter MouseMotionListener MouseMotionAdapter WindowListener WindowAdapter keypressed(keyevent) keyreleased(keyevent) keytyped(keyevent) mouseclicked(mouseevent) mouseentered(mouseevent) mouseexited(mouseevent) mousepressed(mouseevent) mousereleased(mouseevent) mousedragged(mouseevent) mousemoved(mouseevent) windowopened(windowevent) windowactivated(windowevent) windowiconified(windowevent) P.Kasparaitis. Objektinis programavimas. Apletai 21
22 Adapteriai Adapteris tai Listener interfeisą realizuojanti klasė, kurios visi metodai tušti Paveldint iš adapterio galima realizuoti tik reikalingus metodus, nereikia rašyti realizacijų visiems metodams P.Kasparaitis. Objektinis programavimas. Apletai 22
Apletai (įskiepiai) Lekt. dr. Pijus Kasparaitis m. m. pavasario semestras.
Apletai (įskiepiai) Lekt. dr. Pijus Kasparaitis pkasparaitis@yahoo.com 2008-2009 m. m. pavasario semestras Java grafinės bibliotekos AWT (Abstract Window Toolkit) Swing 2009.04.09 P.Kasparaitis. Objektinis
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