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1 | ///////////////////////////////////////////////////////////////////////////// | |
2 | // Name: m_layout.cpp | |
3 | // Purpose: wxHtml module for basic paragraphs/layout handling | |
4 | // Author: Vaclav Slavik | |
5 | // RCS-ID: $Id$ | |
6 | // Copyright: (c) 1999 Vaclav Slavik | |
7 | // Licence: wxWindows Licence | |
8 | ///////////////////////////////////////////////////////////////////////////// | |
9 | #ifdef __GNUG__ | |
10 | #pragma implementation | |
11 | #endif | |
12 | ||
13 | #include "wx/wxprec.h" | |
14 | ||
15 | ||
16 | #include "wx/defs.h" | |
17 | #if wxUSE_HTML && wxUSE_STREAMS | |
18 | #ifdef __BORLANDC__ | |
19 | #pragma hdrstop | |
20 | #endif | |
21 | ||
22 | #ifndef WXPRECOMP | |
23 | #endif | |
24 | ||
25 | ||
26 | #include "wx/html/forcelnk.h" | |
27 | #include "wx/html/m_templ.h" | |
28 | ||
29 | #include "wx/html/htmlwin.h" | |
30 | ||
31 | FORCE_LINK_ME(m_layout) | |
32 | ||
33 | ||
34 | #include <stdlib.h> // bsearch() | |
35 | ||
36 | //----------------------------------------------------------------------------- | |
37 | // wxHtmlPageBreakCell | |
38 | //----------------------------------------------------------------------------- | |
39 | ||
40 | // Since html isn't a page-layout language, it doesn't support page | |
41 | // page breaks directly--that requires CSS2 support. But a page-break | |
42 | // facility is handy, and has been requested more than once on the | |
43 | // mailing lists. This wxHtml tag handler implements just enough of | |
44 | // CSS2 to support a page break by recognizing only | |
45 | // <div style="page-break-before:always"> | |
46 | // | |
47 | // wxHtml maintains page breaks in wxHtmlPrintout::m_PageBreaks. The | |
48 | // tag handler below adds appropriate offsets to that array member. | |
49 | // wxHtmlDCRenderer::Render() accesses that array and makes a new page | |
50 | // begin after each page-break tag. | |
51 | ||
52 | // The page-break handler does all its work in AdjustPagebreak(). For | |
53 | // all tag handlers, that function adjusts the page-break position. | |
54 | // For other tags, it determines whether the html element can fit on | |
55 | // the remainder of the page; if it cannot fit, but must not be split, | |
56 | // then the function moves the page break provided in the argument up, | |
57 | // and returns 'true' to inform the caller that the argument was | |
58 | // modified. | |
59 | // | |
60 | // Due to its special purpose, the page-break facility differs from | |
61 | // other tags. It takes up no space, but it behaves as though there is | |
62 | // never enough room to fit it on the remainder of the page--it always | |
63 | // forces a page break. Therefore, unlike other elements that trigger | |
64 | // a page break, it would never 'fit' on the following page either. | |
65 | // Therefore it's necessary to compare each pagebreak candidate to the | |
66 | // array wxHtmlPrintout::m_PageBreaks of pagebreaks already set, and | |
67 | // set a new one only if it's not in that array. | |
68 | ||
69 | class wxHtmlPageBreakCell : public wxHtmlCell | |
70 | { | |
71 | public: | |
72 | wxHtmlPageBreakCell() {} | |
73 | ||
74 | bool AdjustPagebreak(int* pagebreak, | |
75 | int* known_pagebreaks = NULL, | |
76 | int number_of_pages = 0) const; | |
77 | void Draw(wxDC& WXUNUSED(dc), | |
78 | int WXUNUSED(x), int WXUNUSED(y), | |
79 | int WXUNUSED(view_y1), int WXUNUSED(view_y2), | |
80 | wxHtmlRenderingState& WXUNUSED(state)) {} | |
81 | ||
82 | private: | |
83 | DECLARE_NO_COPY_CLASS(wxHtmlPageBreakCell) | |
84 | }; | |
85 | ||
86 | // Comparison routine for bsearch into an int* array of pagebreaks. | |
87 | extern "C" int wxCMPFUNC_CONV wxInteger_compare(void const* i0, void const* i1) | |
88 | { | |
89 | return *(int*)i0 - *(int*)i1; | |
90 | } | |
91 | ||
92 | bool wxHtmlPageBreakCell::AdjustPagebreak(int* pagebreak, int* known_pagebreaks, int number_of_pages) const | |
93 | { | |
94 | // When we are counting pages, 'known_pagebreaks' is non-NULL. | |
95 | // That's the only time we change 'pagebreak'. Otherwise, pages | |
96 | // were already counted, 'known_pagebreaks' is NULL, and we don't | |
97 | // do anything except return FALSE. | |
98 | // | |
99 | // We also simply return FALSE if the 'pagebreak' argument is | |
100 | // less than (vertically above) or the same as the current | |
101 | // vertical position. Otherwise we'd be setting a pagebreak above | |
102 | // the current cell, which is incorrect, or duplicating a | |
103 | // pagebreak that has already been set. | |
104 | if(NULL == known_pagebreaks || *pagebreak <= m_PosY) | |
105 | { | |
106 | return FALSE; | |
107 | } | |
108 | ||
109 | // m_PosY is only the vertical offset from the parent. The pagebreak | |
110 | // required here is the total page offset, so m_PosY must be added | |
111 | // to the parent's offset and height. | |
112 | int total_height = m_PosY + GetParent()->GetPosY() + GetParent()->GetHeight(); | |
113 | ||
114 | // Search the array of pagebreaks to see whether we've already set | |
115 | // a pagebreak here. The standard bsearch() function is appropriate | |
116 | // because the array of pagebreaks through known_pagebreaks[number_of_pages] | |
117 | // is known to be sorted in strictly increasing order. '1 + number_of_pages' | |
118 | // is used as a bsearch() argument because the array contains a leading | |
119 | // zero plus one element for each page. | |
120 | int* where = (int*) bsearch(&total_height, known_pagebreaks, | |
121 | 1 + number_of_pages, sizeof(int), | |
122 | wxInteger_compare); | |
123 | // Add a pagebreak only if there isn't one already set here. | |
124 | if(NULL != where) | |
125 | { | |
126 | return FALSE; | |
127 | } | |
128 | else | |
129 | { | |
130 | *pagebreak = m_PosY; | |
131 | return TRUE; | |
132 | } | |
133 | } | |
134 | ||
135 | TAG_HANDLER_BEGIN(P, "P") | |
136 | TAG_HANDLER_CONSTR(P) { } | |
137 | ||
138 | TAG_HANDLER_PROC(tag) | |
139 | { | |
140 | if (m_WParser->GetContainer()->GetFirstChild() != NULL) | |
141 | { | |
142 | m_WParser->CloseContainer(); | |
143 | m_WParser->OpenContainer(); | |
144 | } | |
145 | m_WParser->GetContainer()->SetIndent(m_WParser->GetCharHeight(), wxHTML_INDENT_TOP); | |
146 | m_WParser->GetContainer()->SetAlign(tag); | |
147 | return FALSE; | |
148 | } | |
149 | ||
150 | TAG_HANDLER_END(P) | |
151 | ||
152 | ||
153 | ||
154 | TAG_HANDLER_BEGIN(BR, "BR") | |
155 | TAG_HANDLER_CONSTR(BR) { } | |
156 | ||
157 | TAG_HANDLER_PROC(tag) | |
158 | { | |
159 | int al = m_WParser->GetContainer()->GetAlignHor(); | |
160 | wxHtmlContainerCell *c; | |
161 | ||
162 | m_WParser->CloseContainer(); | |
163 | c = m_WParser->OpenContainer(); | |
164 | c->SetAlignHor(al); | |
165 | c->SetAlign(tag); | |
166 | c->SetMinHeight(m_WParser->GetCharHeight()); | |
167 | return FALSE; | |
168 | } | |
169 | ||
170 | TAG_HANDLER_END(BR) | |
171 | ||
172 | ||
173 | ||
174 | TAG_HANDLER_BEGIN(CENTER, "CENTER") | |
175 | TAG_HANDLER_CONSTR(CENTER) { } | |
176 | ||
177 | TAG_HANDLER_PROC(tag) | |
178 | { | |
179 | int old = m_WParser->GetAlign(); | |
180 | wxHtmlContainerCell *c = m_WParser->GetContainer(); | |
181 | ||
182 | m_WParser->SetAlign(wxHTML_ALIGN_CENTER); | |
183 | if (c->GetFirstChild() != NULL) | |
184 | { | |
185 | m_WParser->CloseContainer(); | |
186 | m_WParser->OpenContainer(); | |
187 | } | |
188 | else | |
189 | c->SetAlignHor(wxHTML_ALIGN_CENTER); | |
190 | ||
191 | if (tag.HasEnding()) | |
192 | { | |
193 | ParseInner(tag); | |
194 | ||
195 | m_WParser->SetAlign(old); | |
196 | if (c->GetFirstChild() != NULL) | |
197 | { | |
198 | m_WParser->CloseContainer(); | |
199 | m_WParser->OpenContainer(); | |
200 | } | |
201 | else | |
202 | c->SetAlignHor(old); | |
203 | ||
204 | return TRUE; | |
205 | } | |
206 | else return FALSE; | |
207 | } | |
208 | ||
209 | TAG_HANDLER_END(CENTER) | |
210 | ||
211 | ||
212 | ||
213 | TAG_HANDLER_BEGIN(DIV, "DIV") | |
214 | TAG_HANDLER_CONSTR(DIV) { } | |
215 | ||
216 | TAG_HANDLER_PROC(tag) | |
217 | { | |
218 | if(tag.HasParam(wxT("STYLE"))) | |
219 | { | |
220 | if(tag.GetParam(wxT("STYLE")).IsSameAs(wxT("PAGE-BREAK-BEFORE:ALWAYS"), FALSE)) | |
221 | { | |
222 | m_WParser->CloseContainer(); | |
223 | m_WParser->OpenContainer()->InsertCell(new wxHtmlPageBreakCell); | |
224 | m_WParser->CloseContainer(); | |
225 | m_WParser->OpenContainer(); | |
226 | return FALSE; | |
227 | } | |
228 | else | |
229 | { | |
230 | // Treat other STYLE parameters here when they're supported. | |
231 | return FALSE; | |
232 | } | |
233 | } | |
234 | else if(tag.HasParam(wxT("ALIGN"))) | |
235 | { | |
236 | int old = m_WParser->GetAlign(); | |
237 | wxHtmlContainerCell *c = m_WParser->GetContainer(); | |
238 | if (c->GetFirstChild() != NULL) | |
239 | { | |
240 | m_WParser->CloseContainer(); | |
241 | m_WParser->OpenContainer(); | |
242 | c = m_WParser->GetContainer(); | |
243 | c->SetAlign(tag); | |
244 | m_WParser->SetAlign(c->GetAlignHor()); | |
245 | } | |
246 | else | |
247 | { | |
248 | c->SetAlign(tag); | |
249 | m_WParser->SetAlign(c->GetAlignHor()); | |
250 | } | |
251 | ||
252 | ParseInner(tag); | |
253 | ||
254 | m_WParser->SetAlign(old); | |
255 | if (c->GetFirstChild() != NULL) | |
256 | { | |
257 | m_WParser->CloseContainer(); | |
258 | m_WParser->OpenContainer(); | |
259 | } | |
260 | else | |
261 | c->SetAlignHor(old); | |
262 | ||
263 | return TRUE; | |
264 | } | |
265 | else | |
266 | { | |
267 | return FALSE; | |
268 | } | |
269 | } | |
270 | ||
271 | TAG_HANDLER_END(DIV) | |
272 | ||
273 | ||
274 | ||
275 | ||
276 | TAG_HANDLER_BEGIN(TITLE, "TITLE") | |
277 | TAG_HANDLER_CONSTR(TITLE) { } | |
278 | ||
279 | TAG_HANDLER_PROC(tag) | |
280 | { | |
281 | if (m_WParser->GetWindow()) | |
282 | { | |
283 | wxHtmlWindow *wfr = (wxHtmlWindow*)(m_WParser->GetWindow()); | |
284 | if (wfr) | |
285 | { | |
286 | const wxString& src = *m_WParser->GetSource(); | |
287 | wfr->OnSetTitle(src.Mid(tag.GetBeginPos(), | |
288 | tag.GetEndPos1()-tag.GetBeginPos())); | |
289 | } | |
290 | } | |
291 | return TRUE; | |
292 | } | |
293 | ||
294 | TAG_HANDLER_END(TITLE) | |
295 | ||
296 | ||
297 | ||
298 | ||
299 | TAG_HANDLER_BEGIN(BODY, "BODY") | |
300 | TAG_HANDLER_CONSTR(BODY) { } | |
301 | ||
302 | TAG_HANDLER_PROC(tag) | |
303 | { | |
304 | wxColour clr; | |
305 | ||
306 | if (tag.GetParamAsColour(wxT("TEXT"), &clr)) | |
307 | { | |
308 | m_WParser->SetActualColor(clr); | |
309 | m_WParser->GetContainer()->InsertCell(new wxHtmlColourCell(clr)); | |
310 | } | |
311 | ||
312 | if (tag.GetParamAsColour(wxT("LINK"), &clr)) | |
313 | m_WParser->SetLinkColor(clr); | |
314 | ||
315 | if (tag.GetParamAsColour(wxT("BGCOLOR"), &clr)) | |
316 | { | |
317 | m_WParser->GetContainer()->InsertCell( | |
318 | new wxHtmlColourCell(clr, wxHTML_CLR_BACKGROUND)); | |
319 | if (m_WParser->GetWindow() != NULL) | |
320 | m_WParser->GetWindow()->SetBackgroundColour(clr); | |
321 | } | |
322 | return FALSE; | |
323 | } | |
324 | ||
325 | TAG_HANDLER_END(BODY) | |
326 | ||
327 | ||
328 | ||
329 | TAG_HANDLER_BEGIN(BLOCKQUOTE, "BLOCKQUOTE") | |
330 | TAG_HANDLER_CONSTR(BLOCKQUOTE) { } | |
331 | ||
332 | TAG_HANDLER_PROC(tag) | |
333 | { | |
334 | wxHtmlContainerCell *c; | |
335 | ||
336 | m_WParser->CloseContainer(); | |
337 | c = m_WParser->OpenContainer(); | |
338 | ||
339 | if (c->GetAlignHor() == wxHTML_ALIGN_RIGHT) | |
340 | c->SetIndent(5 * m_WParser->GetCharWidth(), wxHTML_INDENT_RIGHT); | |
341 | else | |
342 | c->SetIndent(5 * m_WParser->GetCharWidth(), wxHTML_INDENT_LEFT); | |
343 | ||
344 | c->SetIndent(m_WParser->GetCharHeight(), wxHTML_INDENT_TOP); | |
345 | m_WParser->OpenContainer(); | |
346 | ParseInner(tag); | |
347 | c = m_WParser->CloseContainer(); | |
348 | c->SetIndent(m_WParser->GetCharHeight(), wxHTML_INDENT_BOTTOM); | |
349 | m_WParser->CloseContainer(); | |
350 | m_WParser->OpenContainer(); | |
351 | return TRUE; | |
352 | } | |
353 | ||
354 | TAG_HANDLER_END(BLOCKQUOTE) | |
355 | ||
356 | ||
357 | ||
358 | // Tag handler for tags that we have to ignore, otherwise non-text data | |
359 | // would show up as text: | |
360 | TAG_HANDLER_BEGIN(DoNothing, "SCRIPT") | |
361 | TAG_HANDLER_CONSTR(DoNothing) { } | |
362 | ||
363 | TAG_HANDLER_PROC(WXUNUSED(tag)) | |
364 | { | |
365 | return true; | |
366 | } | |
367 | TAG_HANDLER_END(DoNothing) | |
368 | ||
369 | ||
370 | ||
371 | TAGS_MODULE_BEGIN(Layout) | |
372 | ||
373 | TAGS_MODULE_ADD(P) | |
374 | TAGS_MODULE_ADD(BR) | |
375 | TAGS_MODULE_ADD(CENTER) | |
376 | TAGS_MODULE_ADD(DIV) | |
377 | TAGS_MODULE_ADD(TITLE) | |
378 | TAGS_MODULE_ADD(BODY) | |
379 | TAGS_MODULE_ADD(BLOCKQUOTE) | |
380 | TAGS_MODULE_ADD(DoNothing) | |
381 | ||
382 | TAGS_MODULE_END(Layout) | |
383 | ||
384 | #endif |