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5526e819 | 1 | ///////////////////////////////////////////////////////////////////////////// |
c88293a4 | 2 | // Name: m_layout.cpp |
5526e819 VS |
3 | // Purpose: wxHtml module for basic paragraphs/layout handling |
4 | // Author: Vaclav Slavik | |
69941f05 | 5 | // RCS-ID: $Id$ |
5526e819 VS |
6 | // Copyright: (c) 1999 Vaclav Slavik |
7 | // Licence: wxWindows Licence | |
8 | ///////////////////////////////////////////////////////////////////////////// | |
3364ab79 RS |
9 | #ifdef __GNUG__ |
10 | #pragma implementation | |
11 | #endif | |
12 | ||
314260fb | 13 | #include "wx/wxprec.h" |
5526e819 | 14 | |
314260fb VS |
15 | |
16 | #include "wx/defs.h" | |
f6bcfd97 | 17 | #if wxUSE_HTML && wxUSE_STREAMS |
2b5f62a0 | 18 | #ifdef __BORLANDC__ |
3364ab79 RS |
19 | #pragma hdrstop |
20 | #endif | |
21 | ||
22 | #ifndef WXPRECOMP | |
3364ab79 RS |
23 | #endif |
24 | ||
5526e819 | 25 | |
69941f05 VS |
26 | #include "wx/html/forcelnk.h" |
27 | #include "wx/html/m_templ.h" | |
5526e819 | 28 | |
69941f05 | 29 | #include "wx/html/htmlwin.h" |
5526e819 | 30 | |
c88293a4 | 31 | FORCE_LINK_ME(m_layout) |
5526e819 VS |
32 | |
33 | ||
f2034f1b VS |
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 | ||
4460b6c4 | 69 | class wxHtmlPageBreakCell : public wxHtmlCell |
f2034f1b | 70 | { |
36c4ff4d | 71 | public: |
f2034f1b VS |
72 | wxHtmlPageBreakCell() {} |
73 | ||
36c4ff4d VS |
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)) {} | |
f2034f1b | 81 | |
36c4ff4d | 82 | private: |
f2034f1b VS |
83 | DECLARE_NO_COPY_CLASS(wxHtmlPageBreakCell) |
84 | }; | |
85 | ||
86 | // Comparison routine for bsearch into an int* array of pagebreaks. | |
f9ba645e | 87 | extern "C" int wxCMPFUNC_CONV wxInteger_compare(void const* i0, void const* i1) |
f2034f1b VS |
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), | |
f9ba645e | 122 | wxInteger_compare); |
f2034f1b VS |
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 | ||
5526e819 VS |
135 | TAG_HANDLER_BEGIN(P, "P") |
136 | ||
137 | TAG_HANDLER_PROC(tag) | |
138 | { | |
e3774124 | 139 | if (m_WParser->GetContainer()->GetFirstChild() != NULL) |
04dbb646 | 140 | { |
4f9297b0 VS |
141 | m_WParser->CloseContainer(); |
142 | m_WParser->OpenContainer(); | |
8c651ab7 | 143 | } |
4f9297b0 VS |
144 | m_WParser->GetContainer()->SetIndent(m_WParser->GetCharHeight(), wxHTML_INDENT_TOP); |
145 | m_WParser->GetContainer()->SetAlign(tag); | |
5526e819 VS |
146 | return FALSE; |
147 | } | |
148 | ||
149 | TAG_HANDLER_END(P) | |
150 | ||
151 | ||
152 | ||
153 | TAG_HANDLER_BEGIN(BR, "BR") | |
154 | ||
155 | TAG_HANDLER_PROC(tag) | |
156 | { | |
4f9297b0 | 157 | int al = m_WParser->GetContainer()->GetAlignHor(); |
5526e819 | 158 | wxHtmlContainerCell *c; |
33ac7e6f | 159 | |
4f9297b0 VS |
160 | m_WParser->CloseContainer(); |
161 | c = m_WParser->OpenContainer(); | |
162 | c->SetAlignHor(al); | |
163 | c->SetAlign(tag); | |
164 | c->SetMinHeight(m_WParser->GetCharHeight()); | |
5526e819 VS |
165 | return FALSE; |
166 | } | |
167 | ||
168 | TAG_HANDLER_END(BR) | |
169 | ||
170 | ||
171 | ||
172 | TAG_HANDLER_BEGIN(CENTER, "CENTER") | |
173 | ||
174 | TAG_HANDLER_PROC(tag) | |
175 | { | |
4f9297b0 VS |
176 | int old = m_WParser->GetAlign(); |
177 | wxHtmlContainerCell *c = m_WParser->GetContainer(); | |
178 | ||
179 | m_WParser->SetAlign(wxHTML_ALIGN_CENTER); | |
e3774124 | 180 | if (c->GetFirstChild() != NULL) |
04dbb646 | 181 | { |
4f9297b0 VS |
182 | m_WParser->CloseContainer(); |
183 | m_WParser->OpenContainer(); | |
5526e819 VS |
184 | } |
185 | else | |
4f9297b0 | 186 | c->SetAlignHor(wxHTML_ALIGN_CENTER); |
5526e819 | 187 | |
33ac7e6f | 188 | if (tag.HasEnding()) |
04dbb646 | 189 | { |
5526e819 VS |
190 | ParseInner(tag); |
191 | ||
4f9297b0 | 192 | m_WParser->SetAlign(old); |
e3774124 | 193 | if (c->GetFirstChild() != NULL) |
04dbb646 | 194 | { |
4f9297b0 VS |
195 | m_WParser->CloseContainer(); |
196 | m_WParser->OpenContainer(); | |
5526e819 VS |
197 | } |
198 | else | |
4f9297b0 | 199 | c->SetAlignHor(old); |
5526e819 VS |
200 | |
201 | return TRUE; | |
202 | } | |
203 | else return FALSE; | |
204 | } | |
205 | ||
206 | TAG_HANDLER_END(CENTER) | |
207 | ||
208 | ||
209 | ||
210 | TAG_HANDLER_BEGIN(DIV, "DIV") | |
211 | ||
212 | TAG_HANDLER_PROC(tag) | |
213 | { | |
92337e39 | 214 | if(tag.HasParam(wxT("STYLE"))) |
04dbb646 | 215 | { |
92337e39 | 216 | if(tag.GetParam(wxT("STYLE")).IsSameAs(wxT("PAGE-BREAK-BEFORE:ALWAYS"), FALSE)) |
f2034f1b VS |
217 | { |
218 | m_WParser->CloseContainer(); | |
219 | m_WParser->OpenContainer()->InsertCell(new wxHtmlPageBreakCell); | |
220 | m_WParser->CloseContainer(); | |
221 | m_WParser->OpenContainer(); | |
222 | return FALSE; | |
223 | } | |
224 | else | |
225 | { | |
226 | // Treat other STYLE parameters here when they're supported. | |
227 | return FALSE; | |
228 | } | |
5526e819 | 229 | } |
92337e39 | 230 | else if(tag.HasParam(wxT("ALIGN"))) |
04dbb646 | 231 | { |
f2034f1b VS |
232 | int old = m_WParser->GetAlign(); |
233 | wxHtmlContainerCell *c = m_WParser->GetContainer(); | |
e3774124 | 234 | if (c->GetFirstChild() != NULL) |
f2034f1b VS |
235 | { |
236 | m_WParser->CloseContainer(); | |
237 | m_WParser->OpenContainer(); | |
238 | c = m_WParser->GetContainer(); | |
239 | c->SetAlign(tag); | |
240 | m_WParser->SetAlign(c->GetAlignHor()); | |
241 | } | |
242 | else | |
243 | { | |
244 | c->SetAlign(tag); | |
245 | m_WParser->SetAlign(c->GetAlignHor()); | |
246 | } | |
5526e819 | 247 | |
f2034f1b | 248 | ParseInner(tag); |
5526e819 | 249 | |
f2034f1b | 250 | m_WParser->SetAlign(old); |
e3774124 | 251 | if (c->GetFirstChild() != NULL) |
f2034f1b VS |
252 | { |
253 | m_WParser->CloseContainer(); | |
254 | m_WParser->OpenContainer(); | |
255 | } | |
256 | else | |
257 | c->SetAlignHor(old); | |
258 | ||
259 | return TRUE; | |
5526e819 VS |
260 | } |
261 | else | |
f2034f1b VS |
262 | { |
263 | return FALSE; | |
264 | } | |
5526e819 VS |
265 | } |
266 | ||
267 | TAG_HANDLER_END(DIV) | |
268 | ||
269 | ||
270 | ||
271 | ||
272 | TAG_HANDLER_BEGIN(TITLE, "TITLE") | |
273 | ||
274 | TAG_HANDLER_PROC(tag) | |
275 | { | |
33ac7e6f | 276 | if (m_WParser->GetWindow()) |
04dbb646 | 277 | { |
4f9297b0 | 278 | wxHtmlWindow *wfr = (wxHtmlWindow*)(m_WParser->GetWindow()); |
33ac7e6f | 279 | if (wfr) |
04dbb646 | 280 | { |
9eeca6df VS |
281 | const wxString& src = *m_WParser->GetSource(); |
282 | wfr->OnSetTitle(src.Mid(tag.GetBeginPos(), | |
283 | tag.GetEndPos1()-tag.GetBeginPos())); | |
5526e819 VS |
284 | } |
285 | } | |
286 | return TRUE; | |
287 | } | |
288 | ||
289 | TAG_HANDLER_END(TITLE) | |
290 | ||
291 | ||
292 | ||
293 | ||
294 | TAG_HANDLER_BEGIN(BODY, "BODY") | |
295 | ||
296 | TAG_HANDLER_PROC(tag) | |
297 | { | |
5526e819 VS |
298 | wxColour clr; |
299 | ||
8bd72d90 | 300 | if (tag.GetParamAsColour(wxT("TEXT"), &clr)) |
04dbb646 | 301 | { |
8bd72d90 VS |
302 | m_WParser->SetActualColor(clr); |
303 | m_WParser->GetContainer()->InsertCell(new wxHtmlColourCell(clr)); | |
5526e819 VS |
304 | } |
305 | ||
8bd72d90 VS |
306 | if (tag.GetParamAsColour(wxT("LINK"), &clr)) |
307 | m_WParser->SetLinkColor(clr); | |
308 | ||
309 | if (tag.GetParamAsColour(wxT("BGCOLOR"), &clr)) | |
04dbb646 | 310 | { |
8bd72d90 VS |
311 | m_WParser->GetContainer()->InsertCell( |
312 | new wxHtmlColourCell(clr, wxHTML_CLR_BACKGROUND)); | |
313 | if (m_WParser->GetWindow() != NULL) | |
314 | m_WParser->GetWindow()->SetBackgroundColour(clr); | |
5526e819 VS |
315 | } |
316 | return FALSE; | |
317 | } | |
318 | ||
319 | TAG_HANDLER_END(BODY) | |
320 | ||
321 | ||
322 | ||
323 | TAG_HANDLER_BEGIN(BLOCKQUOTE, "BLOCKQUOTE") | |
324 | ||
325 | TAG_HANDLER_PROC(tag) | |
326 | { | |
327 | wxHtmlContainerCell *c; | |
33ac7e6f | 328 | |
4f9297b0 VS |
329 | m_WParser->CloseContainer(); |
330 | c = m_WParser->OpenContainer(); | |
33ac7e6f | 331 | |
04dbb646 | 332 | if (c->GetAlignHor() == wxHTML_ALIGN_RIGHT) |
4f9297b0 | 333 | c->SetIndent(5 * m_WParser->GetCharWidth(), wxHTML_INDENT_RIGHT); |
5526e819 | 334 | else |
4f9297b0 | 335 | c->SetIndent(5 * m_WParser->GetCharWidth(), wxHTML_INDENT_LEFT); |
33ac7e6f | 336 | |
04dbb646 | 337 | c->SetIndent(m_WParser->GetCharHeight(), wxHTML_INDENT_TOP); |
4f9297b0 | 338 | m_WParser->OpenContainer(); |
5526e819 | 339 | ParseInner(tag); |
4f9297b0 VS |
340 | c = m_WParser->CloseContainer(); |
341 | c->SetIndent(m_WParser->GetCharHeight(), wxHTML_INDENT_BOTTOM); | |
342 | m_WParser->CloseContainer(); | |
343 | m_WParser->OpenContainer(); | |
5526e819 VS |
344 | return TRUE; |
345 | } | |
346 | ||
347 | TAG_HANDLER_END(BLOCKQUOTE) | |
348 | ||
349 | ||
350 | ||
8829fa82 VS |
351 | // Tag handler for tags that we have to ignore, otherwise non-text data |
352 | // would show up as text: | |
353 | TAG_HANDLER_BEGIN(DoNothing, "SCRIPT") | |
354 | TAG_HANDLER_PROC(tag) | |
355 | { | |
356 | return true; | |
357 | } | |
358 | TAG_HANDLER_END(DoNothing) | |
5526e819 VS |
359 | |
360 | ||
361 | ||
362 | TAGS_MODULE_BEGIN(Layout) | |
363 | ||
364 | TAGS_MODULE_ADD(P) | |
365 | TAGS_MODULE_ADD(BR) | |
366 | TAGS_MODULE_ADD(CENTER) | |
367 | TAGS_MODULE_ADD(DIV) | |
368 | TAGS_MODULE_ADD(TITLE) | |
369 | TAGS_MODULE_ADD(BODY) | |
370 | TAGS_MODULE_ADD(BLOCKQUOTE) | |
8829fa82 | 371 | TAGS_MODULE_ADD(DoNothing) |
5526e819 VS |
372 | |
373 | TAGS_MODULE_END(Layout) | |
374 | ||
375 | #endif |