programmieren:java:praktische_gui_klassen
Inhaltsverzeichnis
Praktische GUI Klassen
AutoSuggest
- AutoSuggest.java
import java.awt.EventQueue; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.util.Collections; import java.util.LinkedList; import java.util.List; import java.util.Set; import javax.swing.DefaultComboBoxModel; import javax.swing.JComboBox; import javax.swing.JTextField; public class AutoSuggest<E> extends JComboBox<E> { private final JComboBox<E> comboBox = this; private final JTextField textField = (JTextField) getEditor().getEditorComponent(); private final List<String> suggestions = new LinkedList<>(); private boolean hide_flag = false; public AutoSuggest() { super(); setEditable(true); textField.addKeyListener(new KeyAdapter() { @Override public void keyTyped(KeyEvent e) { EventQueue.invokeLater(() -> { String text = textField.getText(); if (text.length() == 0) { comboBox.hidePopup(); setModel(new DefaultComboBoxModel(suggestions.toArray()), ""); } else { DefaultComboBoxModel m = getSuggestedModel(suggestions, text); if (m.getSize() == 0 || hide_flag) { comboBox.hidePopup(); hide_flag = false; } else { setModel(m, text); comboBox.showPopup(); } } }); } @Override public void keyPressed(KeyEvent e) { String text = textField.getText(); int code = e.getKeyCode(); switch (code) { case KeyEvent.VK_ENTER: if (!suggestions.contains(text)) { suggestions.add(text); Collections.sort(suggestions); setModel(getSuggestedModel(suggestions, text), text); } hide_flag = true; break; case KeyEvent.VK_ESCAPE: hide_flag = true; break; case KeyEvent.VK_RIGHT: for (int i = 0; i < suggestions.size(); i++) { String str = suggestions.get(i); if (str.startsWith(text)) { comboBox.setSelectedIndex(-1); textField.setText(str); return; } } break; default: break; } } }); setModel(new DefaultComboBoxModel(suggestions.toArray()), ""); } public void update(Set<String> terms) { textField.setText(""); suggestions.clear(); suggestions.addAll(terms); setModel(new DefaultComboBoxModel(suggestions.toArray()), ""); } private void setModel(DefaultComboBoxModel defaultComboBoxModel, String text) { comboBox.setModel(defaultComboBoxModel); comboBox.setSelectedIndex(-1); textField.setText(text); } private static DefaultComboBoxModel getSuggestedModel(List<String> list, String text) { DefaultComboBoxModel m = new DefaultComboBoxModel(); list.stream().filter((s) -> (s.toLowerCase().startsWith(text.toLowerCase()))).forEach((s) -> { m.addElement(s); }); return m; } public JTextField getTextField() { return textField; } public String getText() { return textField.getText(); } }
JHintTextField
- JHintTextField.java
import java.awt.Color; import java.awt.FontMetrics; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Insets; import java.awt.RenderingHints; import javax.swing.JTextField; public class JHintTextField extends JTextField { private String hint = ""; public JHintTextField() { } public JHintTextField(String hint) { setHint(hint); } public final void setHint(String hint) { if (hint != null) { this.hint = hint; } else { this.hint = ""; } } @Override public void paint(Graphics g) { super.paint(g); if (getText().length() == 0) { int h = getHeight(); ((Graphics2D) g).setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON); Insets ins = getInsets(); FontMetrics fm = g.getFontMetrics(); int c0 = getBackground().getRGB(); int c1 = getForeground().getRGB(); int m = 0xfefefefe; int c2 = ((c0 & m) >>> 1) + ((c1 & m) >>> 1); g.setColor(new Color(c2, true)); g.drawString(hint, ins.left, h / 2 + fm.getAscent() / 2 - 1); } } }
FocusHighlighter
- FocusHighlighter.java
import java.awt.Color; import java.awt.event.FocusEvent; import java.awt.event.FocusListener; import javax.swing.UIManager; public class FocusHighlighter implements FocusListener { @Override public void focusGained(FocusEvent e) { e.getComponent().setBackground(Color.YELLOW); } @Override public void focusLost(FocusEvent e) { e.getComponent().setBackground(UIManager.getColor("TextField.background")); } }
DisposeWithESC
- DisposeWithESC.java
import java.awt.event.KeyEvent; import javax.swing.JComponent; import javax.swing.JDialog; import javax.swing.KeyStroke; public class DisposeWithESC { private DisposeWithESC() { } public static void attach(JDialog jDialog) { jDialog.getRootPane().registerKeyboardAction(e -> { jDialog.dispose(); }, KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0), JComponent.WHEN_IN_FOCUSED_WINDOW); } }
LimitDocumentFilter
- LimitDocumentFilter.java
import javax.swing.text.AttributeSet; import javax.swing.text.BadLocationException; import javax.swing.text.DocumentFilter; public class LimitDocumentFilter extends DocumentFilter { public final int limit; public LimitDocumentFilter(int limit) { if (limit <= 0) { throw new IllegalArgumentException("Limit can not be <= 0!"); } this.limit = limit; } @Override public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException { int currentLength = fb.getDocument().getLength(); int overLimit = (currentLength + text.length()) - limit - length; if (overLimit > 0) { text = text.substring(0, text.length() - overLimit); } if (text.length() >= 0) { super.replace(fb, offset, length, text, attrs); } } }
TableSearchDocumentListener
- TableSearchDocumentListener.java
import javax.swing.JTextField; import javax.swing.RowFilter; import javax.swing.event.DocumentEvent; import javax.swing.event.DocumentListener; import javax.swing.table.TableModel; import javax.swing.table.TableRowSorter; public class TableSearchDocumentListener implements DocumentListener { private final JTextField searchTextField; private final TableRowSorter tableRowSorter; public TableSearchDocumentListener(JTextField searchTextField, TableRowSorter tableRowSorter) { this.searchTextField = searchTextField; this.tableRowSorter = tableRowSorter; } @Override public void insertUpdate(DocumentEvent e) { updateTableRowSorter(); } @Override public void removeUpdate(DocumentEvent e) { updateTableRowSorter(); } @Override public void changedUpdate(DocumentEvent e) { updateTableRowSorter(); } private void updateTableRowSorter() { String searchFieldText = searchTextField.getText(); if (searchFieldText != null) { String[] keywords = searchFieldText.split(" "); tableRowSorter.setRowFilter(new KeywordFilter(keywords)); } } public class KeywordFilter extends RowFilter<TableModel, Integer> { private final String[] keywords; // Constructor for filtering a single keyword public KeywordFilter(String keyword) { this.keywords = new String[1]; this.keywords[0] = keyword.toLowerCase(); } // Constructor for filtering an array of keywords // Only the rows that contain every keyword are displayed public KeywordFilter(String[] keywords) { this.keywords = keywords; // convert all keywords to lower case for (int i = 0; i < keywords.length; i++) { keywords[i] = keywords[i].toLowerCase(); } } @Override public boolean include(RowFilter.Entry entry) { // Does the row contain all keywords? Assume true and set to false if // one is missing boolean containsAll = true; for (int i = 0; containsAll == true && i < keywords.length; i++) { // Is the keyword contained in one of the columns? Assume false and // set to true if it is found boolean containsThis = false; for (int j = 0; containsThis == false && j < entry.getValueCount(); j++) { if (entry.getStringValue(j).toLowerCase().contains(keywords[i])) { containsThis = true; } } if (!containsThis) { containsAll = false; } } return containsAll; } } }
programmieren/java/praktische_gui_klassen.txt · Zuletzt geändert: 2016/12/01 13:52 von andreas