More Swing. Chapter 14. Chapter 14 1
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1 More Swing Chapter 14 Chapter 14 1
2 Objectives learn to add menus, icons, borders, and scroll bars to GUIs learn to use the BoxLayout manager and the Box class learn about inner classes learn about the WindowListener interface learn how to change GUI components to visible or invisible Chapter 14 2
3 Outline Menus Making GUIs Pretty and More Functional More Layout Managers Inner Classes More on Events and Listeners The Swing Class Hierarchy Reconsidered Chapter 14 3
4 Menus: Outline Programming Example: A GUI with a Menu Menu Bars, Menus, and Menu Items Nested Menus Chapter 14 4
5 Programming Example: A GUI with a Menu class MemoGUI Chapter 14 5
6 Programming Example: A GUI with a Menu, cont. class MemoGUI, cont. Chapter 14 6
7 Programming Example: A GUI with a Menu, cont. Chapter 14 7
8 Menu Bars, Menus, and Menu Items You add menus using three Swing classes: JMenuBar JMenu JMenuItem JMenuItems are placed in a JMenu, and a JMenu typically is placed in a JMenuBar. By default, an object of class JMenuItem is identified by the string that labels it. Chapter 14 8
9 Menu Bars, Menus, and Menu Items, cont. Using method add, you can add as many JMenuItems as you wish to a menu. example JMenu_Name.add(JMenu_Item); The menu lists them in the order in which they are added. Listeners are added using JMenu_Item_Name.addActionListener (Action_Listener); Chapter 14 9
10 Menu Bars, Menus, and Menu Items, cont. Method actionperformed is defined for menu items the same way it is defined for buttons. The menu in our example includes an additional entry labeled Exit. Chapter 14 10
11 Menu Bars A menu bar is a container for a menu. Typically it is placed near the top of a windowing interface. Menus are added to the menu bar using JMenu_Bar_Name.add(JMenu_Name); A menu bar can be added to a JFrame using setjmenubar(jmenu_bar_name); Chapter 14 11
12 Menu Bars, cont. Alternatively, a menu bar can be added to the content pane of a JFrame or other container. Chapter 14 12
13 Setting the Action Command for a Menu Item If you do not wish to use the text for a JMenuItem as the default action command, you can set the action command using Menu_Item_Object.setActionCommand (Action_Command_String); Chapter 14 13
14 Nested Menus Class JMenu descends from class JMenuItem, so every JMenu object is also a JMenuItem object. Thus, a JMenu can be a menu item in another menu, permitting menus to be nested (cascading menus). Chapter 14 14
15 Making GUIs Pretty and More Functional: Outline Adding Icons The JScrollPane Class for Scroll Bars Adding Borders Chapter 14 15
16 Adding Icons Typically, an icon is simply a small picture. Labels, buttons, menu items, and other components can have icons. A label or button can have just a string, just an icon, both, or neither. A picture in almost any standard format can be used as the basis for an icon. Chapter 14 16
17 Converting a Picture to a Swing Icon You use class ImageIcon to convert a picture file to a Swing Icon. example ImageIcon dukewavingicon = new ImageIcon( duke_waving.gif ); You can use a relative or complete path name to specify the picture file. Chapter 14 17
18 Adding an Icon to a Label and a Button To produce a button with just an icon on it, you use JButton dukebutton = new JButton(dukeWavingIcon); setactioncommand should be used explicitly to give the button an action command. Chapter 14 18
19 Placing an Icon and a String on a Label (or Button) example JButton hellobutton = new JButton( Hello ); ImageIcon dukewavingicon = new ImageIcon( dukewaving.gif ); hellobutton.seticon(dukewavingicon); Chapter 14 19
20 Placing an Icon and a String on a Label (or Button), cont. class IconDemo Chapter 14 20
21 Placing an Icon and a String on a Label (or Button), cont. Chapter 14 21
22 Some Methods in the Classes JButton and JLabel to create a button or label with no text and no icon public JButton() public JLabel() to create a button or label with text public JButton(String text) public JLabel(String text) Chapter 14 22
23 Some Methods in the Classes JButton and JLabel, cont. to create a button or label with an icon public JButton(ImageIcon Picture) public JLabel(ImageIcon Picture) to create a button or label with both text and an icon public JButton(String text, ImageIcon Picture) public JLabel(String text, ImageIcon Picture) Chapter 14 23
24 Some Methods in the Classes JButton and JLabel, cont. to make text the text on the already created button or label public void settext(string text) to make picture the icon on the already created button or label public void seticon(imageicon picture) Chapter 14 24
25 Some Methods in the Classes JButton and JLabel, cont. to set the size of the margin (in pixels) around the text and icon in the button (but not the label) public void setmargin(insets margin) or public void setmargin (new Insets(int top, int left, int bottom, int right)) Chapter 14 25
26 Some Methods in the Classes JButton and JLabel, cont. to set the preferred size (in pixels) of the button or label public void setpreferredsize( Dimension(preferredSize)) or public void setpreferredsize( new Dimension(int width, int height)) Chapter 14 26
27 Some Methods in the Classes JButton and JLabel, cont. to set the maximum size (in pixels) of the button or label public void setmaximumsize( Dimension(maximumSize)) or public void setmaximumsize( new Dimension(int width, int height)) Chapter 14 27
28 Some Methods in the Classes JButton and JLabel, cont. to set the minimum size (in pixels) of the button or label public void setminimumsize( Dimension(minimumSize)) or public void setminimumsize( new Dimension(int width, int height)) Chapter 14 28
29 Some Methods in the Classes JButton and JLabel, cont. to set the vertical position of the text relative to the icon public void setverticaltextposition (int textposition) where textposition is one of the constants SwingConstants.TOP SwingConstants.CENTER (default) SwingContants.BOTTOM Chapter 14 29
30 Some Methods in the Classes JButton and JLabel, cont. to set the horizontal position of the text relative to the icon public void sethorizontaltextposition (int textposition) where textposition is one of the constants SwingConstants.RIGHT (default) SwingConstants.LEFT Chapter 14 30
31 Resizing Buttons The methods for setting the preferred, maximum, and minimum sizes are only recommendations to the layout manager. An image may be clipped (NOT resized) if the icon is too big. Chapter 14 31
32 Classes Dimension and Inset Objects of classes Dimension and Inset are used with buttons, labels, and other objects. The numbers are in pixels. constructors Insets (int top, int left, int bottom, int right) Dimension(int width, int height) Chapter 14 32
33 Classes Dimension and Inset, cont. examples abutton.setmargin(new Insets (10, 20, 10, 20)); alabel.setpreferredsize (new Dimension (20, 50)); Chapter 14 33
34 The JScrollPane Class for Scroll Bars When you create a text area, you specify the number of lines that are visible and the number of characters per line. example JTextArea the Text = new JTextArea(10,40;) It might be better not to limit the number of lines and the number of characters per line. Chapter 14 34
35 The JScrollPane Class for Scroll Bars, cont. This can be accommodated using scroll bars along the sides of the window or view port that shows only a selected portion of the text. The view port functions as a cut out over an unbounded document. Chapter 14 35
36 The JScrollPane Class for Scroll Bars, cont. Chapter 14 36
37 The JScrollPane Class for Scroll Bars, cont. Scroll bars can be provided using class JScrollPane. An object of class JScrollPane is essentially a view port with scroll bars. Chapter 14 37
38 The JScrollPane Class for Scroll Bars, cont. The text area is provided as an argument to the JScrollPane constructor. example JScrollPane scrolledtext = new JScrollPane(theText); A JScrollPane can be added to a container such as a JPanel or a JFrame. example textpanel.add(scrolledtext); Chapter 14 38
39 The JScrollPane Class for Scroll Bars, cont. class ScrollBarDemo Chapter 14 39
40 The JScrollPane Class for Scroll Bars, cont. Chapter 14 40
41 Scroll Bar Policy If you omit the invocation of the methods sethorizontalscrollbarpolicy and setverticalscrollbarpolicy, the scroll bars will be visible only when you need them. Chapter 14 41
42 Some Methods and Constants in Class JScrollBar to create a new JScrollPane for the objecttobescrolled public JScrollPane(Component objecttobescrolled) Chapter 14 42
43 Some Methods and Constants in Class JScrollBar, cont. To set the policy for showing the horizontal scroll bar public void sethorizontalscrollbarpolicy(int policy) where policy is one of JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS JScrollPane.HORIZONTAL_SCROLLBAR_NEVER JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED (default) Chapter 14 43
44 Some Methods and Constants in Class JScrollBar, cont. To set the policy for showing the vertical scroll bar public void setverticalscrollbarpolicy(int policy) where policy is one of JScrollPane.VERTICAL_SCROLLBAR_AL WAYS JScrollPane VERTICAL SCROLLBAR NE Chapter 14 44
45 Adding Borders A border is an area around a component that frames the component. You can add a border to any JComponent. A border can serve two purposes: to make a component more attractive to separate the component from other components Chapter 14 45
46 Adding Borders, cont. to use the border classes import javax.swing.border.* to provide a border JComponent.setBorder(Border_Object); Chapter 14 46
47 Adding Borders, cont. class BorderDemo Chapter 14 47
48 Adding Borders, cont. Chapter 14 48
49 Adding Borders, cont. You can place a border around any JComponent such as a JButton, a JLabel, a JPanel, or a JTextField. It is common to use an anonymous border object. example testbutton.setborder(new BevelBorder(BevelBorder.LOWERED)); Chapter 14 49
50 Some Border Classes to create a BevelBorder object public BevelBorder(int beveltype) where beveltype is one of BevelBorder.RAISED BevelBorder.LOWERED Chapter 14 50
51 Some Border Classes, cont. to create an EtchedBorder object public EtchedBorder(int etchtype, Color highlight, Color shadow) where etchtype is one of EtchedBorder.RAISED EtchedBorder.LOWERED to create an EtchedBorder object public EtchedBorder(Color highlight, Color shadow) Chapter 14 51
52 Some Border Classes, cont. to create an EmptyBorder object public EmptyBorder(int top, int left, int bottom, int right) to create a LineBorder object public LineBorder(Color thecolor, int thickness) to create LineBorder object with rounded corners public LineBorder(Color thecolor, int thickness, boolean roundedcorners) Chapter 14 52
53 Some Border Classes, cont. to create a MatteBorder object public MatteBorder(int top, int left, int bottom, int right, Color thecolor) to create a MatteBorder object with an icon public MatteBorder(int top, int left, Chapter 14 53
54 More Layout Managers: Outline The BoxLayout Manager Class Struts and Glue Setting the Spacing Between Components The Box Container Class The CardLayout Manager Class Chapter 14 54
55 The BoxLayout Manager Class The FlowLayout manager can produce a horizontal array, and the GridLayout manager with a single column can produce a vertical array. However, the BoxLayout manager and the Box container class are more powerful. A Box container is a panel-like class that uses the BoxLayout manager. Chapter 14 55
56 The BoxLayout Manager Class, cont. Chapter 14 56
57 The BoxLayout Manager Class, cont. We will consider two different programs that produce this GUI. Chapter 14 57
58 The BoxLayout Manager class BoxLayoutDemo Class, cont. Chapter 14 58
59 The BoxLayout Manager Class, cont. The constructor for the BoxLayout manager expects two arguments. The first argument is the container for which it is the layout manager. The second argument is one of two constants BoxLayout.X_AXIS BoxLayout.Y_AXIS Chapter 14 59
60 Struts and Glue Static methods in class Box produce invisible components that can be added to a container. These invisible components add space between visible components. Method createhorizontalstrut creates a strut which is an invisible component with a fixed horizontal size. Chapter 14 60
61 Struts and Glue, cont. A layout manager cannot change the vertical size of a horizontal strut. Method VerticalStrut creates a strut which is an invisible component with a fixed vertical size. A layout manager cannot change the horizontal size of a vertical strut. Chapter 14 61
62 Struts and Glue, cont. Like struts, glue components are invisible components. Unlike struts, glue components are not rigid. They are like wet glue and can be made larger or smaller by the layout manager. Struts and glue are best used with a BoxLayout manager. Chapter 14 62
63 Struts and Glue, cont. Glue components can be horizontal or vertical. to create glue components Component horizontalglue = Box.createHorizontalGlue(); Component verticalglue = Box.createVerticalGlue(); to add a glue component, use horizontalbox.add(horizontalglue); Chapter 14 63
64 Setting the Spacing Between Components Except for the BoxLayout manager, the layout managers we have discussed use the following methods: public void sethgap(int hgap) public void setvgap(int vgap) where hgap and vgap are expressed in pixels. Alternatively, you can separate components using an EmptyBorder with any layout manager. Chapter 14 64
65 The Box Container Class An object of class Box behaves like a panel that has a BoxLayout manager. Instead of the JPanels used in class BoxLayoutDemo, class BoxClassDemo uses Box containers. Chapter 14 65
66 The Box Container Class Instead of the JPanels used in class BoxLayoutDemo Chapter 14 66
67 The Box Container Class class BoxClassDemo uses Box containers. Chapter 14 67
68 The Box Container Class, cont. Objects of class Box are created using a static method. to create the horizontalbox object Box horizontalbox = Box.createHorizontalBox(); to create the verticalbox object Box verticalbox = Box.createVerticalBox(); Chapter 14 68
69 The Box Container Class, cont. Method setlayout is not used to determine the layout of a Box object. An object of class Box automatically uses the BoxLayout manager. Chapter 14 69
70 The Box Container Class, cont. equivalent statements Box horizontalbox = new Box (BoxLayout.X_AXIS); and Box horizontalbox = Box.createHorizontalBox(); Chapter 14 70
71 The Box Container Class, cont. more equivalent statements Box verticalbox = new Box (BoxLayout.Y_AXIS); and Box verticalbox = Box.createVerticalBox(); Chapter 14 71
72 The CardLayout Manager Class The CardLayout manager class can add a dynamic element to a Swing GUI. The CardLayout manager class provides a set of views you can change - somewhat like flipping through or selecting from a deck of cards. Any number of views can be added to a container, but only one at a time is viewable. Chapter 14 72
73 The CardLayout Manager Class, cont. Views can be selected in order or randomly. Chapter 14 73
74 The CardLayout Manager Class, cont. class CardLayoutDemo Chapter 14 74
75 The CardLayout Manager Class, cont. Chapter 14 75
76 The CardLayout Manager Class, cont. We did not use an anonymous variable deckpanel.setlayout(new CardLayout()); Instead we used dealer = new CardLayout(); deckpanel.setlayout(dealer); to permit us to change the displayed card and to permit us to refer to the CardLayout manager in more than one method. Chapter 14 76
77 The CardLayout Manager Class, cont. The first argument of method add names the component provided as the second argument. example deckpanel.add( start, startcardpanel); deckpanel.add( green, greencardpanel); deckpanel.add( red, redcardpanel); Chapter 14 77
78 The CardLayout Manager Class, cont. Two other methods, first and next, permit you to select a view. examples dealer.first(deckpanel); dealer.next(deckpanel); The container always starts with the first component on view. After the last component, next goes back to the first component. Chapter 14 78
79 Some Methods in the CardLayout Manager Class to display the first card in the container public void first (Container thecontainer); to display the last card in the container public void last (Container thecontainer); to display the next card public void next (Container thecontainer); Chapter 14 79
80 Some Methods in the CardLayout Manager Class, cont. to display the previous card public void previous(container thecontainer); to display the card that was added with cardname as its name public void show (Container thecontainer, String cardname); Chapter 14 80
81 Inner Classes An inner class is a class defined within another class. Often, inner classes are used as helping classes when programming with Swing. Typically, helping classes are declared private. Chapter 14 81
82 Helping Classes Swing windows typically use class WindowDestroyer to close a window. Class WindowDestroyer can be an inner class. Chapter 14 82
83 Helping Classes, cont. class InnerClassDemo Chapter 14 83
84 Helping Classes, cont. Chapter 14 84
85 Advantages of Inner Classes Because inner classes are defined within an outer class, they can make the outer class self-contained (or more self-contained). The methods in the inner class have access to all the instance variables and methods of the outer class, including the private methods and variables. This increases efficiency. Chapter 14 85
86 Advantages of Inner Classes, cont. Inner classes are used frequently as listeners to handle events fired by the outer class or by a component of the outer class. The name of the inner class is local to the class in which it is defined, making it possible to have another class with the same name defined outside the class in which it is defined. Chapter 14 86
87 Invoking Methods of the Outer Class When there is a method invocation in an inner class, but a method with that name exists only in the outer class, the method of the outer class is invoked (i.e. the calling object is the this of the outer class, not the this of the inner class). Chapter 14 87
88 More on Events and Listeners: Outline The WindowListener Interface More Details on Updating a GUI Chapter 14 88
89 The WindowListener Interface When we placed buttons on a window, we made the window itself the button-listener class. But, when we wanted a window listener to respond to window-closing events, we made a separate window-listener class named WindowDestroyer (or an inner class named InnerDestroyer). Chapter 14 89
90 The WindowListener Interface, cont. We can make the window itself the window listener. The WindowListener interface makes the window itself the listener just as the ActionListener interface makes a window a button listener. Chapter 14 90
91 The WindowListener Interface, cont. To make class ButtonDemo (pages 37-38) an action listener and a window listener, it would begin public class ButtonDemo extends JFrame implements ActionListener, Window Listener Unfortunately, interface WindowListener requires 7 methods to be implemented. Chapter 14 91
92 The WindowListener Interface, cont. These 7 methods are the first of 10 methods in class WindowAdapter. Nevertheless, window class which is derived from class JFrame and which implements the WindowListener interface makes it easy to call a method in the window class within the window listener class, since they are in the same class. Chapter 14 92
93 Methods in the WindowListener Interface Chapter 14 93
94 A Window Listener class WindowListenerDemo Chapter 14 94
95 A Window Listener, cont. Chapter 14 95
96 Method dispose Because the GUI class is its own window listener this.dispose(); is allowed in method windowclosing. Method dispose is a method in class JFame, and class WindowListenerDemo is derived from class JFrame (so it inherits method dispose). Chapter 14 96
97 Method dispose, cont. Method dispose releases any resources used by the window. The program does not end when method dispose is invoked. Chapter 14 97
98 WindowListener vs. WindowAdapter WindowAdapter is a convenient variant of WindowListener. WindowAdapter implements interface WindowListener by giving every method an empty body. Any class derived from WindowAdapter does not need to provide those empty definitions. Chapter 14 98
99 WindowListener vs. WindowAdapter, cont. But sometimes, you want a listener class to be derived from class JFrame, which prevents it from being derived from class WindowAdapter. Instead it can implement interface WindowListener. Chapter 14 99
100 Java Tip: Programming the Close-Window Button To program the close-window button of a JFrame to do something other than cause the window to go away or end the program, add setdefaultcloseoperation (WindowConstants.DO_NOTHING_ON_CLOSING); to the constructor. Chapter
101 Java Tip: Programming the Close-Window Button, cont. class CloseWindowDemo Chapter
102 Java Tip: Programming the Close-Window Button, cont. Chapter
103 Java Tip: Programming the Close-Window Button, cont. If you invoke setdefaultcloseoperation, by default the window disappears but the program does not end. Simply reprogramming method windowclosing does not cancel the default action. Chapter
104 Java Tip: Programming the Close-Window Button, cont. To prevent the window from going away, you must first reset the default action with method setdefaultcloseoperation. Further, the close-window button is reprogrammed by registering the inner class InnerDestroyer as the window listener. Chapter
105 Java Tip: Programming the Close-Window Button, cont. Class ConfirmWindow is an inner class of class CloseWindowDemo, making class CloseWindowDemo self-contained. Chapter
106 Java Tip: More About setdefaultcloseoperation constants you can use with method setdefaultcloseoperation to permit any desired action to be programmed in method windowclosing WindowConstants.DO_NOTHING_ON_CLOSE Chapter
107 Java Tip: More About setdefaultcloseoperation cont. to hide the frame after invoking any registered WindowListener objects WindowConstants.HIDE_ON_CLOSE (the default action of setdefaultcloseoperation is not invoked) Chapter
108 Java Tip: More About setdefaultcloseoperation, cont. to hide and dispose of the frame after invoking any registered WindowListener objects WindowConstants.DISPOSE_ON_CLOSE to exit the application using method System.exit JFrame.EXIT_ON_CLOSE Chapter
109 Java Tip: More About setdefaultcloseoperation, cont. to program most Swing GUIs to have no window listener and still get the correct action for the close-window button setdefaultcloseoperation (JFrame.EXIT_ON_CLOSE); Chapter
110 Programmng Example: Components with Changing Visibility class VisibilityDemo Chapter
111 Programmng Example: Components with Changing Visibility Chapter
112 Method validate Every container class has a method validate for updating the container. Method validate causes the container to lay out its components again and redisplay them. Some changes, such as adding components or changing visibility require an invocation of method validate. Chapter
113 More Details on Updating GUIs Most changes to a GUI windowing system are done automatically by the repaint manager. However, a change in the visibility of a component requires an invocation of method validate, as we have discussed. Methods pack and repaint are two other updating methods common in Swing code. Chapter
114 More Details on Updating GUIs, cont. Method pack causes the window to be resized to an approximation of the preferred size. Method repaint repaints the window. Chapter
115 The Swing Class Hierarchy Reconsidered: Outline Buttons, Menus, and Abstract Buttons Other Swing Classes and Methods Chapter
116 Buttons, Menus, and Abstract Buttons Class JButton and class JMenuItem both are derived from class AbstractButton, from which all of the basic properties and methods (other than constructors) of class JButton and class JMenuItem are inherited. Class AbstractButton inherits some of these methods from class JComponent. Chapter
117 Buttons, Menus, and Abstract Buttons Chapter
118 Buttons, Menus, and Abstract Buttons Because class JMenu is derived from class JMenuItem, a menu is also a menu item, permitting a JMenu to be added to another JMenu to make nest menus possible. Because class JMenuBar is derived from class JComponent, a JMenuBar can be added to a container. With a suitable layout manager, you can have several JMenuBars, placed almost anywhere. Chapter
119 Java Tip: More Constructors for Class JMenuItem to create a menu item with no text or icon (assuming settext or seticon will be used later) public JMenuItem() to create a menu item with the text on it public JMenuItem(String text) to create a menu item with the icon picture on it public JMenuItem(ImageIcon picture) Chapter
120 Java Tip: More Constructors for Class JMenuItem, cont. to create a menu item with both the text and the icon picture on it public JMenuItem (String text, ImageIcon picture) Chapter
121 Other Swing Classes and Methods In Chapter 12 and in this chapter, you have learned a lot about Swing. However, a typically book on Swing is longer than the book for this course, and still doesn t cover all of Swing. Most of the classes, methods, and facilities that should be in Swing probably are in Swing already. Chapter
122 Summary You have learned to add menus, icons, borders, and scroll bars to GUIs. You have learned to use the BoxLayout manager and the Box class. You have learned about inner classes. You have learned about the WindowListener interface. You have learned how to change GUI components to visible or invisible. Chapter
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