1 /*
2 * RichEdit - Operations on rows of text (rows are recreated during
3 * wrapping and are used for displaying the document, they don't keep any
4 * true document content; delete all rows, rewrap all paragraphs and
5 * you get them back).
6 *
7 * Copyright 2004 by Krzysztof Foltman
8 *
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
22 */
23
24
25 #include "editor.h"
26
27 ME_DisplayItem *ME_FindRowStart(ME_Context *c, ME_DisplayItem *item,
28 int nRelPos) {
29 ME_DisplayItem *para = ME_GetParagraph(item);
30 ME_MustBeWrapped(c, para);
31 if(nRelPos<=0) { /* if this or preceding row */
32 do {
33 ME_DisplayItem *item2 = ME_FindItemBack(item, diStartRowOrParagraph);
34 if (item2->type == diParagraph)
35 {
36 if (item2->member.para.prev_para == NULL)
37 return item;
38 /* if skipping to the preceding paragraph, ensure it's wrapped */
39 ME_MustBeWrapped(c, item2->member.para.prev_para);
40 item = item2;
41 continue;
42 }
43 else if (item2->type == diStartRow)
44 {
45 nRelPos++;
46 if (nRelPos>0)
47 return item;
48 item = item2;
49 continue;
50 }
51 assert(0 == "bug in FindItemBack(item, diStartRowOrParagraph)");
52 item = item2;
53 } while(1);
54 }
55 while(nRelPos>0) { /* if one of the next rows */
56 ME_DisplayItem *item2 = ME_FindItemFwd(item, diStartRowOrParagraph);
57 if (!item2)
58 return item;
59 if (item2->type == diParagraph)
60 {
61 if (item2->member.para.next_para == NULL)
62 return item;
63 continue;
64 }
65 item = item2;
66 nRelPos--;
67 }
68 return item;
69 }
70
71 /* I'm sure these functions would simplify some code in caret ops etc,
72 * I just didn't remember them when I wrote that code
73 */
74
75 ME_DisplayItem *ME_RowStart(ME_DisplayItem *item) {
76 return ME_FindItemBackOrHere(item, diStartRow);
77 }
78
79 /*
80 ME_DisplayItem *ME_RowEnd(ME_DisplayItem *item) {
81 ME_DisplayItem *item2 = ME_FindItemFwd(item, diStartRowOrParagraphOrEnd);
82 if (!item2) return NULL;
83 return ME_FindItemBack(item, diRun);
84 }
85 */
86
87 ME_DisplayItem *
88 ME_FindRowWithNumber(ME_TextEditor *editor, int nRow)
89 {
90 ME_DisplayItem *item = ME_FindItemFwd(editor->pBuffer->pFirst, diParagraph);
91 int nCount = 0;
92
93 while (item && nCount + item->member.para.nRows <= nRow)
94 {
95 nCount += item->member.para.nRows;
96 item = ME_FindItemFwd(item, diParagraph);
97 }
98 if (!item)
99 return item;
100 for (item = ME_FindItemFwd(item, diStartRow); item && nCount < nRow; nCount++)
101 item = ME_FindItemFwd(item, diStartRow);
102 return item;
103 }
104
105
106 int
107 ME_RowNumberFromCharOfs(ME_TextEditor *editor, int nOfs)
108 {
109 ME_DisplayItem *item = editor->pBuffer->pFirst->next;
110 int nRow = 0;
111
112 while (item && item->member.para.next_para->member.para.nCharOfs <= nOfs)
113 {
114 nRow += item->member.para.nRows;
115 item = ME_FindItemFwd(item, diParagraph);
116 }
117 if (item)
118 {
119 ME_DisplayItem *next_para = item->member.para.next_para;
120
121 nOfs -= item->member.para.nCharOfs;
122 item = ME_FindItemFwd(item, diRun);
123 while ((item = ME_FindItemFwd(item, diStartRowOrParagraph)) != NULL)
124 {
125 if (item == next_para)
126 break;
127 item = ME_FindItemFwd(item, diRun);
128 if (item->member.run.nCharOfs > nOfs)
129 break;
130 nRow++;
131 }
132 }
133 return nRow;
134 }
135
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