Gridarta Editor
PrevPage.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 PrevPage implements ActionListener {
19 
20  private final boolean select;
21 
22  public PrevPage(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  int firstLine = textArea.getFirstLine();
30  final int visibleLines = textArea.getVisibleLines();
31  final int line = textArea.getCaretLine();
32 
33  if (firstLine < visibleLines) {
34  firstLine = visibleLines;
35  }
36 
37  textArea.setFirstLine(firstLine - visibleLines);
38 
39  final int caret = textArea.getLineStartOffset(Math.max(0, line - visibleLines));
40  if (select) {
41  textArea.select(textArea.getMarkPosition(), caret);
42  } else {
43  textArea.setCaretPosition(caret);
44  }
45  }
46 
47 }
net.sf.gridarta.textedit.textarea.actions.PrevPage.select
final boolean select
Definition: PrevPage.java:20
net.sf.gridarta.textedit.textarea.JEditTextArea
jEdit's text area component.
Definition: JEditTextArea.java:91
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.getVisibleLines
int getVisibleLines()
Returns the number of lines visible in this text area.
Definition: JEditTextArea.java:342
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
net.sf.gridarta.textedit.textarea.JEditTextArea.getMarkPosition
int getMarkPosition()
Returns the mark position.
Definition: JEditTextArea.java:621
net.sf.gridarta.textedit.textarea.actions.PrevPage.actionPerformed
void actionPerformed(final ActionEvent e)
Definition: PrevPage.java:27
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.JEditTextArea.setFirstLine
void setFirstLine(final int firstLine)
Sets the line displayed at the text area's origin without updating the scroll bars.
Definition: JEditTextArea.java:328
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.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.PrevPage.PrevPage
PrevPage(final boolean select)
Definition: PrevPage.java:22
net.sf.gridarta.textedit.textarea.actions.PrevPage
Definition: PrevPage.java:18
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