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Easy Learn Java: Programming Articles, Examples and Tips - Page 386


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Summary - GUI Containers

Go to all tips in Swing, AWT

Top-level Container: javax.swing.JFrame

JFrame - window, typically subclassed
w = new JFrame(); Constructor
w = new JFrame(t); Constructor. Sets titlebar to t.
w.setTitle(t); Sets titlebar text to t
w.setDefaultCloseOperation(opt); JFrame.EXIT_ON_CLOSE terminates program when close box clicked.
w.setVisible(true/false); Make visible (and start GUI thread) or hide.
w.pack(); Calculates layout on all inner containers and sets size of JFrame.
w.setContentPane(cont); Sets the content pane - common to pass a JPanel here.
cont = w.getContentPane(); Returns the window's content pane.
w.setJMenuBar(mb); Adds a JMenuBar.
w.setResizable(false); Prevent user from resizing window.
w.setLocation(x, y); Positions window's top left corner at screen coordinates (x, y).
w.setSize(w, h); Sets window size, but use layouts and pack() instead.
w.show(); Deprecated. Use w.setVisible(true).
w.hide(); Deprecated. Use w.setVisible(false).

Top-level Containers: Dialogs: JOptionPane, JFileChooser, JColorChooser, JDialog

JOptionPane - Commonly used to create dialogs.

Low-level Container supporting layouts - JPanel

JPanel - Set layout and add components to JPanel.
p = new JPanel(); Creates new JPanel
p.setLayout(layout); Sets the panel's layout.
p.add(widget); Add widget to next position - FlowLayout, GridLayout, BoxLayout.
p.add(widget, constraint); Add widget at position constraint = BorderLayout, GridbagLayout).

Low-level Containers - special purpose - JSrollPane, JTabbedPane

JScrollPane - Holds textarea, list, (or large images in label) and adds scroll bars as necessary.
scr = new JScrollPane(textarea); Surrounds textarea with scrollbars as needed.
JTabbedPane - Display tabs to allow user to select one of many panels.
tp = new JTabbledPane(); Constructor. Creates new tabbed pane.
tp = new JTabbledPane(place); Constructor. placement is JTabbedPane.TOP (default), BOTTOM, LEFT, or RIGHT.
tp = new JTabbledPane(place, ovrfl); Constructor. ovrfl tells what to do if too many tabs: JTabbedPane.WRAP_TAB_LAYOUT or .SCROLL_TAB_LAYOUT.
tp.addTab(title, comp); Adds tab labelled with string title which displays comp (usually JPanel).
tp.addTab(title, icon, comp); Used string and icon for tab label.

Copyleft Fred Swartz


comments? | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Thursday, July 21, 2005 (00:00:00) (2638 reads)

Summary - Basic GUI Components (Widgets)

Go to all tips in Swing, AWT
Most components have a few common methods.
cmp.requestFocus(); Puts focus (eg, blinking cursor) in the field, selection of a button, etc.
tf.setFont(f); Sets font.
JLabel - For fixed text.
lbl = new JLabel(t) Creates JLabel with text on it. Typically created in call to add() and not assigned.
JTextField - Box containing one line of text.
tf = new JTextField(n); Creates textfield about n columns wide.
s = tf.getText(); Returns string in textfield.
tf.setText(s); Sets text to s.
tf.addActionListener(lst); Action listener lst will be called if enter typed.
tf.setEditable(bool); Don't allow user to edit text field used for output.
tf.setHorizontalAlignment(align); JTextField.LEFT (default), JTextField.CENTER, or JTextField.RIGHT
JButton - Standard clickable button.
btn = new JButton(t); Creates button with text t.
btn = new JButton(img); Creates button with icon img.
btn = new JButton(t, img); Creates button with both text and icon.
btn.addActionListener(lst); Action listener lst called when button clicked.
btn.setEnabled(bool); Used to enable/disable button.
JTextArea - Box containing multiple lines of text separated by ' '.
ta = new JTextField(rows, cols); Creates textarea with specifed number of rows and columns.
s = ta.getText(); Returns string in textfield.
ta.setText(s); Sets text to s.
ta.append(s); Adds s to end of existing text.
ta.insert(s, pos); Inserts s at position pos.
ta.setEditable(bool); Don't allow user to edit textarea if used for output.
ta.setLineWrap(bool); Allow/disallow long lines to wrap.
ta.setWrapStyleWord(bool); Call setLineWrap(true) first. true wraps at word boundaries, false (default) at characters.
JCheckBox - Check box followed by text. Use with listener or to get/set state.
cb = new JCheckBox(text); Creates check box initially unchecked.
cb = new JCheckBox(text, bool); Creates check box with checked state tf.
b = cb.isSelected(); Returns bool if box is checked/unchecked.
cb.setSelected(bool); Sets checked state to tf.
ta.addItemListener(itemListen); Adds an item listener.
JList - List of string values. Put in JScrollPane if scrolling needed.
lst = new JList(); Creates empty JList.
lst = new JList(sarray); Creates JList intialized to String array sarray. Can also use array of Objects.
lst.setListData(sarray); Sets list "model" to String array sarray.
s = (String)lst.getSelectedValue(); Returns value as Object value. Typically cast to String. null if no selection.
i = lst.getSelectedIndex(); Returns index of selection or -1 if no selection.

Copyleft Fred Swartz


comments? | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Wednesday, July 20, 2005 (00:00:00) (3063 reads)

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