591 lines
16 KiB
C++
591 lines
16 KiB
C++
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#include <nana/config.hpp>
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#include PLATFORM_SPEC_HPP
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#include <nana/paint/text_renderer.hpp>
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#include <nana/unicode_bidi.hpp>
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#include <nana/paint/detail/native_paint_interface.hpp>
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namespace nana
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{
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namespace paint
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{
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namespace helper
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{
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template<typename F>
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void for_each_line(const nana::char_t * str, std::size_t len, int top, F & f)
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{
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auto head = str;
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auto end = str + len;
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for(auto i = str; i != end; ++i)
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{
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if(*i == '\n')
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{
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top += static_cast<int>(f(top, head, i - head));
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head = i + 1;
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}
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}
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if(head != end)
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f(top, head, end - head);
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}
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struct draw_string
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{
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drawable_type dw;
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const int x, endpos;
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nana::unicode_bidi bidi;
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std::vector<nana::unicode_bidi::entity> reordered;
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align text_align;
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draw_string(drawable_type dw, int x, int endpos, align ta)
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: dw(dw), x(x), endpos(endpos), text_align(ta)
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{}
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unsigned operator()(int top, const nana::char_t * buf, std::size_t bufsize)
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{
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int xpos = x;
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unsigned pixels = 0;
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bidi.linestr(buf, bufsize, reordered);
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switch(text_align)
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{
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case align::left:
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for(auto & ent : reordered)
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{
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std::size_t len = ent.end - ent.begin;
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nana::size ts = detail::text_extent_size(dw, ent.begin, len);
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if(ts.height > pixels) pixels = ts.height;
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if(xpos + static_cast<int>(ts.width) > 0)
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detail::draw_string(dw, xpos, top, ent.begin, len);
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xpos += static_cast<int>(ts.width);
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if(xpos >= endpos)
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break;
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}
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break;
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case align::center:
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{
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unsigned lenpx = 0;
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std::vector<unsigned> widths;
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for(auto & ent : reordered)
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{
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auto ts = detail::text_extent_size(dw, ent.begin, ent.end - ent.begin);
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if(ts.height > pixels) pixels = ts.height;
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lenpx += ts.width;
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widths.push_back(ts.width);
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}
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xpos += (endpos - xpos - static_cast<int>(lenpx))/2;
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auto ipx = widths.begin();
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for(auto & ent : reordered)
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{
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if(xpos + static_cast<int>(*ipx) > 0)
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detail::draw_string(dw, xpos, top, ent.begin, ent.end - ent.begin);
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xpos += static_cast<int>(*ipx);
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if(xpos >= endpos)
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break;
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}
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}
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break;
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case align::right:
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{
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int xend = endpos;
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std::swap(xpos, xend);
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for(auto i = reordered.rbegin(), end = reordered.rend(); i != end; ++i)
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{
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auto & ent = *i;
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std::size_t len = ent.end - ent.begin;
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nana::size ts = detail::text_extent_size(dw, ent.begin, len);
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if(ts.height > pixels) pixels = ts.height;
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if(xpos > xend)
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{
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xpos -= static_cast<int>(ts.width);
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detail::draw_string(dw, xpos, top, i->begin, len);
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}
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if(xpos <= xend || xpos <= 0)
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break;
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}
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}
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break;
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}
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return pixels;
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}
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};
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struct draw_string_omitted
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{
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graphics & graph;
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int x, endpos;
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nana::color_t color;
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unsigned omitted_pixels;
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nana::unicode_bidi bidi;
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std::vector<nana::unicode_bidi::entity> reordered;
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draw_string_omitted(graphics& graph, int x, int endpos, nana::color_t color, bool omitted)
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: graph(graph), x(x), endpos(endpos), color(color)
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{
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omitted_pixels = (omitted ? graph.text_extent_size(STR("..."), 3).width : 0);
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if(endpos - x > static_cast<int>(omitted_pixels))
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this->endpos -= omitted_pixels;
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else
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this->endpos = x;
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}
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unsigned operator()(int top, const nana::char_t * buf, std::size_t bufsize)
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{
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drawable_type dw = graph.handle();
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int xpos = x;
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unsigned pixels = 0;
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bidi.linestr(buf, bufsize, reordered);
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for(auto & i : reordered)
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{
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std::size_t len = i.end - i.begin;
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nana::size ts = detail::text_extent_size(dw, i.begin, len);
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if(ts.height > pixels) pixels = ts.height;
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if(xpos + static_cast<int>(ts.width) <= endpos)
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{
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detail::draw_string(dw, xpos, top, i.begin, len);
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xpos += static_cast<int>(ts.width);
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}
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else
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{
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nana::rectangle r;
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r.width = endpos - xpos;
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r.height = ts.height;
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nana::paint::graphics dum_graph(r.width, r.height);
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dum_graph.bitblt(r, graph, nana::point(xpos, top));
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dum_graph.string(0, 0, color, i.begin, len);
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r.x = xpos;
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r.y = top;
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graph.bitblt(r, dum_graph);
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if(omitted_pixels)
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detail::draw_string(dw, endpos, top, STR("..."), 3);
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break;
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}
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}
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return pixels;
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}
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};
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struct draw_string_auto_changing_lines
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{
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graphics & graph;
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int x, endpos;
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nana::unicode_bidi bidi;
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std::vector<nana::unicode_bidi::entity> reordered;
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std::vector<nana::size> ts_keeper;
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align text_align;
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draw_string_auto_changing_lines(graphics& graph, int x, int endpos, align ta)
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: graph(graph), x(x), endpos(endpos), text_align(ta)
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{}
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unsigned operator()(int top, const nana::char_t * buf, std::size_t bufsize)
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{
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unsigned pixels = 0;
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drawable_type dw = graph.handle();
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unsigned str_w = 0;
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ts_keeper.clear();
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bidi.linestr(buf, bufsize, reordered);
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for(auto & i : reordered)
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{
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nana::size ts = detail::text_extent_size(dw, i.begin, i.end - i.begin);
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if(ts.height > pixels) pixels = ts.height;
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ts_keeper.push_back(ts);
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str_w += ts.width;
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}
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//Test whether the text needs the new line.
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if(x + static_cast<int>(str_w) > endpos)
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{
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pixels = 0;
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unsigned line_pixels = 0;
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int xpos = x;
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int orig_top = top;
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auto i_ts_keeper = ts_keeper.cbegin();
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for(auto & i : reordered)
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{
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if(line_pixels < i_ts_keeper->height)
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line_pixels = i_ts_keeper->height;
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bool beyond_edge = (xpos + static_cast<int>(i_ts_keeper->width) > endpos);
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if(beyond_edge)
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{
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std::size_t len = i.end - i.begin;
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if(len > 1)
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{
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unsigned * pxbuf = new unsigned[len];
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//Find the char that should be splitted
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graph.glyph_pixels(i.begin, len, pxbuf);
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std::size_t idx_head = 0, idx_splitted;
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do
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{
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idx_splitted = find_splitted(idx_head, len, xpos, endpos, pxbuf);
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if(idx_splitted == len)
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{
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detail::draw_string(dw, xpos, top, i.begin + idx_head, idx_splitted - idx_head);
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for(std::size_t i = idx_head; i < len; ++i)
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xpos += static_cast<int>(pxbuf[i]);
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break;
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}
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//Check the word whether it is splittable.
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if(splittable(i.begin, idx_splitted))
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{
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detail::draw_string(dw, xpos, top, i.begin + idx_head, idx_splitted - idx_head);
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idx_head = idx_splitted;
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xpos = x;
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top += line_pixels;
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line_pixels = i_ts_keeper->height;
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}
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else
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{
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//Search the splittable character from idx_head to idx_splitted
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const nana::char_t * u = i.begin + idx_splitted;
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const nana::char_t * head = i.begin + idx_head;
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for(; head < u; --u)
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{
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if(splittable(head, u - head))
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break;
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}
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if(u != head)
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{
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detail::draw_string(dw, xpos, top, head, u - head);
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idx_head += u - head;
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xpos = x;
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top += line_pixels;
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line_pixels = i_ts_keeper->height;
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}
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else
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{
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u = i.begin + idx_splitted;
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const nana::char_t * end = i.begin + len;
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for(; u < end; ++u)
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{
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if(splittable(head, u - head))
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break;
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}
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std::size_t splen = u - head;
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top += line_pixels;
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xpos = x;
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detail::draw_string(dw, x, top, head, splen);
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line_pixels = i_ts_keeper->height;
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for(std::size_t k = idx_head; k < idx_head + splen; ++k)
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xpos += static_cast<int>(pxbuf[k]);
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if(xpos >= endpos)
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{
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xpos = x;
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top += line_pixels;
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line_pixels = i_ts_keeper->height;
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}
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idx_head += splen;
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}
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}
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}while(idx_head < len);
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delete [] pxbuf;
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}
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else
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{
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detail::draw_string(dw, x, top += static_cast<int>(line_pixels), i.begin, 1);
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xpos = x + static_cast<int>(i_ts_keeper->width);
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}
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line_pixels = 0;
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}
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else
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{
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detail::draw_string(dw, xpos, top, i.begin, i.end - i.begin);
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xpos += static_cast<int>(i_ts_keeper->width);
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}
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++i_ts_keeper;
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}
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pixels = (top - orig_top) + line_pixels;
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}
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else
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{
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//The text could be drawn in a line.
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if((align::left == text_align) || (align::center == text_align))
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{
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int xpos = x;
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if(align::center == text_align)
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xpos += (endpos - x - static_cast<int>(str_w)) / 2;
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auto i_ts_keeper = ts_keeper.cbegin();
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for(auto & ent : reordered)
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{
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const nana::size & ts = *i_ts_keeper;
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if(xpos + static_cast<int>(ts.width) > 0)
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detail::draw_string(dw, xpos, top, ent.begin, ent.end - ent.begin);
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xpos += static_cast<int>(ts.width);
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++i_ts_keeper;
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}
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}
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else if(align::right == text_align)
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{
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int xpos = endpos;
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auto i_ts_keeper = ts_keeper.crbegin();
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for(auto i = reordered.crbegin(), end = reordered.crend(); i != end; ++i)
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{
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auto & ent = *i;
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std::size_t len = ent.end - ent.begin;
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const nana::size & ts = *i_ts_keeper;
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xpos -= ts.width;
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if(xpos >= 0)
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detail::draw_string(dw, xpos, top, ent.begin, len);
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++i_ts_keeper;
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}
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}
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}
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return pixels;
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}
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static std::size_t find_splitted(std::size_t begin, std::size_t end, int x, int endpos, unsigned * pxbuf)
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{
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unsigned acc_width = 0;
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for(std::size_t i = begin; i < end; ++i)
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{
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if(x + static_cast<int>(acc_width + pxbuf[i]) > endpos)
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{
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if(i == begin)
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++i;
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return i;
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}
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acc_width += pxbuf[i];
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}
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return end;
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}
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static bool splittable(const nana::char_t * str, std::size_t index)
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{
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nana::char_t ch = str[index];
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if(('0' <= ch && ch <= '9') || ('a' <= ch && ch <= 'z') || ('A' <= ch && ch <= 'Z'))
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{
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nana::char_t prch;
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if(index)
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{
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prch = str[index - 1];
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if('0' <= ch && ch <= '9')
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return !(('0' <= prch && prch <= '9') || (str[index - 1] == '-'));
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return (('z' < prch || prch < 'a') && ('Z' < prch || prch < 'A'));
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}
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else
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return false;
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}
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return true;
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}
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};
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struct extent_auto_changing_lines
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{
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graphics & graph;
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int x, endpos;
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nana::unicode_bidi bidi;
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std::vector<nana::unicode_bidi::entity> reordered;
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std::vector<nana::size> ts_keeper;
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unsigned extents;
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extent_auto_changing_lines(graphics& graph, int x, int endpos)
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: graph(graph), x(x), endpos(endpos), extents(0)
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{}
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unsigned operator()(int top, const nana::char_t * buf, std::size_t bufsize)
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{
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unsigned pixels = 0;
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drawable_type dw = graph.handle();
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unsigned str_w = 0;
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ts_keeper.clear();
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bidi.linestr(buf, bufsize, reordered);
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for(auto & i : reordered)
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{
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nana::size ts = detail::text_extent_size(dw, i.begin, i.end - i.begin);
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ts_keeper.push_back(ts);
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str_w += ts.width;
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}
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auto i_ts_keeper = ts_keeper.cbegin();
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//Test whether the text needs the new line.
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if(x + static_cast<int>(str_w) > endpos)
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{
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unsigned line_pixels = 0;
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int xpos = x;
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int orig_top = top;
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for(auto & i : reordered)
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{
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if(line_pixels < i_ts_keeper->height)
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line_pixels = i_ts_keeper->height;
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bool beyond_edge = (xpos + static_cast<int>(i_ts_keeper->width) > endpos);
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if(beyond_edge)
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{
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std::size_t len = i.end - i.begin;
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if(len > 1)
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{
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unsigned * pxbuf = new unsigned[len];
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//Find the char that should be splitted
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graph.glyph_pixels(i.begin, len, pxbuf);
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std::size_t idx_head = 0, idx_splitted;
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do
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{
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idx_splitted = draw_string_auto_changing_lines::find_splitted(idx_head, len, xpos, endpos, pxbuf);
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if(idx_splitted == len)
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{
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for(std::size_t i = idx_head; i < len; ++i)
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xpos += static_cast<int>(pxbuf[i]);
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break;
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}
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//Check the word whether it is splittable.
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if(draw_string_auto_changing_lines::splittable(i.begin, idx_splitted))
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{
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idx_head = idx_splitted;
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xpos = x;
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top += line_pixels;
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line_pixels = i_ts_keeper->height;
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}
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else
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{
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//Search the splittable character from idx_head to idx_splitted
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const nana::char_t * u = i.begin + idx_splitted;
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const nana::char_t * head = i.begin + idx_head;
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for(; head < u; --u)
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{
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if(draw_string_auto_changing_lines::splittable(head, u - head))
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break;
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}
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if(u != head)
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{
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idx_head += u - head;
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xpos = x;
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top += line_pixels;
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line_pixels = i_ts_keeper->height;
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}
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else
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{
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u = i.begin + idx_splitted;
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const nana::char_t * end = i.begin + len;
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for(; u < end; ++u)
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{
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if(draw_string_auto_changing_lines::splittable(head, u - head))
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break;
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}
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std::size_t splen = u - head;
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top += line_pixels;
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xpos = x;
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line_pixels = i_ts_keeper->height;
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for(std::size_t k = idx_head; k < idx_head + splen; ++k)
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xpos += static_cast<int>(pxbuf[k]);
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if(xpos >= endpos)
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{
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xpos = x;
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top += line_pixels;
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line_pixels = i_ts_keeper->height;
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}
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idx_head += splen;
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}
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}
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}while(idx_head < len);
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delete [] pxbuf;
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}
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else
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xpos = x + static_cast<int>(i_ts_keeper->width);
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line_pixels = 0;
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}
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else
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xpos += static_cast<int>(i_ts_keeper->width);
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++i_ts_keeper;
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}
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pixels = (top - orig_top) + line_pixels;
|
|
}
|
|
else
|
|
{
|
|
while(i_ts_keeper != ts_keeper.cend())
|
|
{
|
|
const nana::size & ts = *(i_ts_keeper++);
|
|
if(ts.height > pixels) pixels = ts.height;
|
|
}
|
|
}
|
|
extents += pixels;
|
|
return pixels;
|
|
}
|
|
};
|
|
}//end namespace helper
|
|
|
|
//class text_renderer
|
|
text_renderer::text_renderer(graph_reference graph, align ta)
|
|
: graph_(graph), text_align_(ta)
|
|
{}
|
|
|
|
void text_renderer::render(int x, int y, nana::color_t col, const nana::char_t * str, std::size_t len)
|
|
{
|
|
if(graph_)
|
|
{
|
|
helper::draw_string ds(graph_.handle(), x, static_cast<int>(graph_.width()), text_align_);
|
|
ds.dw->fgcolor(col);
|
|
helper::for_each_line(str, len, y, ds);
|
|
}
|
|
}
|
|
|
|
void text_renderer::render(int x, int y, nana::color_t col, const nana::char_t * str, std::size_t len, unsigned restricted_pixels, bool omitted)
|
|
{
|
|
if(graph_)
|
|
{
|
|
helper::draw_string_omitted dso(graph_, x, x + static_cast<int>(restricted_pixels), col, omitted);
|
|
graph_.handle()->fgcolor(col);
|
|
helper::for_each_line(str, len, y, dso);
|
|
}
|
|
}
|
|
|
|
void text_renderer::render(int x, int y, nana::color_t col, const nana::char_t * str, std::size_t len, unsigned restricted_pixels)
|
|
{
|
|
if(graph_)
|
|
{
|
|
helper::draw_string_auto_changing_lines dsacl(graph_, x, x + static_cast<int>(restricted_pixels), text_align_);
|
|
graph_.handle()->fgcolor(col);
|
|
helper::for_each_line(str, len, y, dsacl);
|
|
}
|
|
}
|
|
|
|
nana::size text_renderer::extent_size(int x, int y, const nana::char_t* str, std::size_t len, unsigned restricted_pixels) const
|
|
{
|
|
nana::size extents;
|
|
if(graph_)
|
|
{
|
|
helper::extent_auto_changing_lines eacl(graph_, x, x + static_cast<int>(restricted_pixels));
|
|
helper::for_each_line(str, len, y, eacl);
|
|
extents.width = restricted_pixels;
|
|
extents.height = eacl.extents;
|
|
}
|
|
return extents;
|
|
}
|
|
//end class text_renderer
|
|
|
|
|
|
}
|
|
}
|