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Java > Open Source Codes > org > gjt > sp > jedit > textarea > ScrollLineCount


1 /*
2  * ScrollLineCount.java
3  * :tabSize=8:indentSize=8:noTabs=false:
4  * :folding=explicit:collapseFolds=1:
5  *
6  * Copyright (C) 2005 Slava Pestov
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License
10  * as published by the Free Software Foundation; either version 2
11  * of the License, or any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21  */
22
23 package org.gjt.sp.jedit.textarea;
24
25 import org.gjt.sp.jedit.Debug;
26 import org.gjt.sp.util.Log;
27
28 /**
29  * Maintains the vertical scrollbar.
30  */
31 class ScrollLineCount extends Anchor
32 {
33     //{{{ ScrollLineCount constructor
34 ScrollLineCount(DisplayManager displayManager,
35         TextArea textArea)
36     {
37         super(displayManager,textArea);
38     } //}}}
39
40     public void changed() {}
41
42     //{{{ reset() method
43 public void reset()
44     {
45         if(Debug.SCROLL_DEBUG)
46             Log.log(Log.DEBUG,this,"reset()");
47
48         physicalLine = displayManager.getFirstVisibleLine();
49         int scrollLine = 0;
50         while(physicalLine != -1)
51         {
52             int before = scrollLine;
53             displayManager.updateScreenLineCount(physicalLine);
54             if(before != scrollLine)
55                 throw new RuntimeException JavaDoc(this + " nudged");
56             scrollLine += displayManager
57                 .getScreenLineCount(physicalLine);
58             physicalLine = displayManager
59                 .getNextVisibleLine(physicalLine);
60         }
61
62         this.scrollLine = scrollLine;
63         physicalLine = displayManager.getBuffer().getLineCount();
64     } //}}}
65 }
66
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