Gridarta Editor
Home.java
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1 /*
2  * InputHandler.java - Manages key bindings and executes actions
3  * Copyright (C) 1999 Slava Pestov
4  * Copyright (C) 2000-2023 The Gridarta Developers.
5  *
6  * You may use and modify this package for any purpose. Redistribution is
7  * permitted, in both source and binary form, provided that this notice
8  * remains intact in all source distributions of this package.
9  */
10 
11 package net.sf.gridarta.textedit.textarea.actions;
12 
13 import java.awt.event.ActionEvent;
14 import java.awt.event.ActionListener;
17 
18 public class Home implements ActionListener {
19 
20  private final boolean select;
21 
22  public Home(final boolean select) {
23  this.select = select;
24  }
25 
26  @Override
27  public void actionPerformed(final ActionEvent e) {
28  final JEditTextArea textArea = InputHandler.getTextArea(e);
29 
30  int caret = textArea.getCaretPosition();
31 
32  final int firstLine = textArea.getFirstLine();
33 
34  final int firstOfLine = textArea.getLineStartOffset(textArea.getCaretLine());
35  final int firstVisibleLine = firstLine == 0 ? 0 : firstLine + textArea.getElectricScroll();
36  final int firstVisible = textArea.getLineStartOffset(firstVisibleLine);
37 
38  if (caret == 0) {
39  textArea.getToolkit().beep();
40  return;
41  }
42  if (!Boolean.TRUE.equals(textArea.getClientProperty(InputActions.SMART_HOME_END_PROPERTY))) {
43  caret = firstOfLine;
44  } else if (caret == firstVisible) {
45  caret = 0;
46  } else if (caret == firstOfLine) {
47  caret = firstVisible;
48  } else {
49  caret = firstOfLine;
50  }
51 
52  if (select) {
53  textArea.select(textArea.getMarkPosition(), caret);
54  } else {
55  textArea.setCaretPosition(caret);
56  }
57  }
58 
59 }
net.sf.gridarta.textedit.textarea.JEditTextArea
jEdit's text area component.
Definition: JEditTextArea.java:91
net.sf.gridarta.textedit.textarea.JEditTextArea.getElectricScroll
int getElectricScroll()
Returns the number of lines from the top and button of the text area that are always visible.
Definition: JEditTextArea.java:290
net.sf.gridarta.textedit.textarea
This package contains the other part of the script editor.
net.sf.gridarta
Base package of all Gridarta classes.
net.sf.gridarta.textedit.textarea.JEditTextArea.getCaretLine
int getCaretLine()
Returns the caret line.
Definition: JEditTextArea.java:612
net.sf.gridarta.textedit.textarea.JEditTextArea.getFirstLine
int getFirstLine()
Returns the line displayed at the text area's origin.
Definition: JEditTextArea.java:320
net.sf.gridarta.textedit.textarea.actions.Home.actionPerformed
void actionPerformed(final ActionEvent e)
Definition: Home.java:27
net.sf
net.sf.gridarta.textedit.textarea.JEditTextArea.getMarkPosition
int getMarkPosition()
Returns the mark position.
Definition: JEditTextArea.java:621
net.sf.gridarta.textedit.textarea.InputHandler
An input handler converts the user's key strokes into concrete actions.
Definition: InputHandler.java:36
net.sf.gridarta.textedit.textarea.actions.InputActions.SMART_HOME_END_PROPERTY
static final String SMART_HOME_END_PROPERTY
If this client property is set to Boolean.TRUE on the text area, the home/end keys will support 'smar...
Definition: InputActions.java:33
net.sf.gridarta.textedit
net
net.sf.gridarta.textedit.textarea.InputHandler.getTextArea
static JEditTextArea getTextArea(final EventObject evt)
Returns the text area that fired the specified event.
Definition: InputHandler.java:144
net.sf.gridarta.textedit.textarea.JEditTextArea.setCaretPosition
void setCaretPosition(final int caret)
Sets the caret position.
Definition: JEditTextArea.java:631
net.sf.gridarta.textedit.textarea.actions.Home.Home
Home(final boolean select)
Definition: Home.java:22
net.sf.gridarta.textedit.textarea.actions.InputActions
Definition: InputActions.java:25
net.sf.gridarta.textedit.textarea.actions.Home
Definition: Home.java:18
net.sf.gridarta.textedit.textarea.JEditTextArea.getLineStartOffset
int getLineStartOffset(final int line)
Returns the start offset of the specified line.
Definition: JEditTextArea.java:525
net.sf.gridarta.textedit.textarea.actions.Home.select
final boolean select
Definition: Home.java:20
net.sf.gridarta.textedit.textarea.JEditTextArea.select
void select(final int start, final int end)
Selects from the start offset to the end offset.
Definition: JEditTextArea.java:649
net.sf.gridarta.textedit.textarea.JEditTextArea.getCaretPosition
int getCaretPosition()
Returns the caret position.
Definition: JEditTextArea.java:605