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fix bug that label word wrap fails for Japanese(#330)

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word break error
new unicode word break
reimplement label word wrap for significant design error
This commit is contained in:
Jinhao
2018-08-19 05:53:08 +08:00
parent 9ff6567a03
commit 79c3439231
5 changed files with 486 additions and 13 deletions
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413
source/gui/widgets/label.cpp
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@@ -20,6 +20,8 @@
#include <stdexcept>
#include <sstream>
#define VISUAL_LINES
namespace nana
{
namespace drawerbase
@@ -28,6 +30,7 @@ namespace nana
{
class renderer
{
#ifndef VISUAL_LINES
typedef widgets::skeletons::dstream::linecontainer::iterator iterator;
struct pixel_tag
@@ -37,6 +40,32 @@ namespace nana
std::size_t baseline; //The baseline for drawing text.
std::vector<iterator> values; //line values
};
#else
//Iterator of content element in a line.
using content_element_iterator = widgets::skeletons::dstream::linecontainer::const_iterator; //subsitute for member type iterator
struct visual_line //subsitute of pixel_tag
{
struct element
{
content_element_iterator content_element;
std::pair<std::size_t, std::size_t> range; //A part of text in a text element. first: text begin, second: text length
element(const content_element_iterator& iterator, std::size_t range_begin, std::size_t range_end):
content_element(iterator),
range(range_begin, range_end)
{
}
};
int x_base; //The x position where this line starts.
std::size_t extent_height_px;
std::size_t baseline; //The baseline for rendering text.
std::vector<element> elements; //description of text element in this rendering line.
};
#endif
//this is a helper variable, it just keeps the status while drawing.
struct render_status
@@ -46,8 +75,12 @@ namespace nana
align_v text_align_v;
nana::point pos;
#ifndef VISUAL_LINES
std::vector<pixel_tag> pixels;
std::size_t index;
#else
std::vector<visual_line> vslines; //The lines description of a line of text. substitute of member pixels.
#endif
std::size_t index; //indicates the current rendering visual line.
};
struct traceable
@@ -102,18 +135,32 @@ namespace nana
rs.text_align = th;
rs.text_align_v = tv;
#ifndef VISUAL_LINES
std::deque<std::vector<pixel_tag> > pixel_lines;
#else
//All visual lines data of whole text.
std::deque<std::vector<visual_line>> content_lines;
#endif
std::size_t extent_v_pixels = 0; //the pixels, in height, that text will be painted.
for (auto & line : dstream_)
{
#ifndef VISUAL_LINES
_m_line_pixels(line, def_line_pixels, rs);
for (auto & m : rs.pixels)
extent_v_pixels += m.pixels;
pixel_lines.emplace_back(std::move(rs.pixels));
#else
_m_prepare_visual_lines(graph, line, def_line_pixels, rs);
for (auto & vsline : rs.vslines)
extent_v_pixels += vsline.extent_height_px;
content_lines.emplace_back(std::move(rs.vslines));
#endif
if(extent_v_pixels >= graph.height())
break;
@@ -129,13 +176,17 @@ namespace nana
else
rs.pos.y = 0;
#ifndef VISUAL_LINES
auto pixels_iterator = pixel_lines.begin();
#else
auto vsline_iterator = content_lines.begin();
#endif
for (auto & line : dstream_)
{
if (rs.pos.y >= static_cast<int>(graph.height()))
break;
#ifndef VISUAL_LINES
rs.index = 0;
rs.pixels.clear();
@@ -148,6 +199,17 @@ namespace nana
break;
rs.pos.y += static_cast<int>(rs.pixels.back().pixels);
#else
rs.index = 0;
rs.vslines.clear();
rs.vslines.swap(*vsline_iterator++);
rs.pos.x = rs.vslines.front().x_base;
if (!_m_foreach_visual_line(graph, rs))
break;
rs.pos.y += static_cast<int>(rs.vslines.back().extent_height_px);
#endif
}
graph.typeface(pre_font);
@@ -194,8 +256,13 @@ namespace nana
for(auto & line: dstream_)
{
#ifndef VISUAL_LINES
rs.pixels.clear();
unsigned w = _m_line_pixels(line, def_line_pixels, rs);
#else
rs.vslines.clear();
auto w = _m_prepare_visual_lines(graph, line, def_line_pixels, rs);
#endif
if(limited && (w > limited))
w = limited;
@@ -203,8 +270,13 @@ namespace nana
if(retsize.width < w)
retsize.width = w;
#ifndef VISUAL_LINES
for (auto & px : rs.pixels)
retsize.height += static_cast<unsigned>(px.pixels);
#else
for (auto& vsline : rs.vslines)
retsize.height += static_cast<unsigned>(vsline.extent_height_px);
#endif
}
return retsize;
@@ -315,6 +387,7 @@ namespace nana
}
}
#ifndef VISUAL_LINES
void _m_align_x_base(const render_status& rs, pixel_tag & px, unsigned w) noexcept
{
switch(rs.text_align)
@@ -330,7 +403,209 @@ namespace nana
break;
}
}
#else
void _m_prepare_x(const render_status& rs, visual_line & vsline, unsigned w) noexcept
{
switch (rs.text_align)
{
case align::left:
vsline.x_base = 0;
break;
case align::center:
vsline.x_base = (static_cast<int>(rs.allowed_width - w) >> 1);
break;
case align::right:
vsline.x_base = static_cast<int>(rs.allowed_width - w);
break;
}
}
#endif
#ifdef VISUAL_LINES
/**
* prepare data for rendering a line of text.
*/
unsigned _m_prepare_visual_lines(graph_reference graph, dstream::linecontainer& line, unsigned def_line_px, render_status& rs)
{
unsigned abs_text_px = 0;
unsigned max_ascent = 0;
unsigned max_descent = 0;
unsigned max_content_height = 0;
int text_pos = 0;
std::vector<visual_line::element> vsline_elements;
for (auto i = line.cbegin(); i != line.cend(); ++i)
{
auto const data = i->data_ptr;
auto fblock = i->fblock_ptr;
abs_text_px += data->size().width;
unsigned ascent = 0;
unsigned descent = 0;
auto extent_size = data->size();
//Check if the content is displayed in current line.
if ((0 == rs.allowed_width) || (text_pos + extent_size.width <= rs.allowed_width))
{
text_pos += static_cast<int>(extent_size.width);
//Adjust height of extent_size for special text alignement.
if (fblock::aligns::baseline == fblock->text_align)
{
ascent = static_cast<unsigned>(data->ascent());
descent = static_cast<unsigned>(extent_size.height - ascent);
if (max_descent < descent)
max_descent = descent;
if ((false == data->is_text()) && (extent_size.height < max_ascent + max_descent))
extent_size.height = max_ascent + max_descent;
}
if (max_ascent < ascent) max_ascent = ascent;
if (max_descent < descent) max_descent = descent;
if (max_content_height < extent_size.height) max_content_height = extent_size.height;
vsline_elements.emplace_back(i, 0, data->text().size());
continue;
}
//make a visual line for existing vsline elements
if (text_pos)
{
#ifdef _nana_std_has_returnable_emplace_back
auto & vsline = rs.vslines.emplace_back();
#else
rs.vslines.emplace_back();
auto & vsline = rs.vslines.back();
#endif
_m_prepare_x(rs, vsline, static_cast<unsigned>(text_pos));
if (max_ascent + max_descent > max_content_height)
max_content_height = max_descent + max_ascent;
else
max_ascent = max_content_height - max_descent;
vsline.extent_height_px = max_content_height;
vsline.baseline = max_ascent;
vsline.elements.swap(vsline_elements);
}
text_pos = 0;
max_content_height = max_ascent = max_descent = 0;
//Adjust height of extent_size for special text alignement.
if (fblock::aligns::baseline == fblock->text_align)
{
ascent = static_cast<unsigned>(data->ascent());
descent = static_cast<unsigned>(extent_size.height - ascent);
if (max_descent < descent)
max_descent = descent;
if ((false == data->is_text()) && (extent_size.height < max_ascent + max_descent))
extent_size.height = max_ascent + max_descent;
}
if (max_ascent < ascent) max_ascent = ascent;
if (max_descent < descent) max_descent = descent;
if (max_content_height < extent_size.height) max_content_height = extent_size.height;
if (data->is_text())
{
_m_change_font(graph, fblock);
//Split a text into multiple lines
auto rest_extent_size = extent_size.width;
std::size_t text_begin = 0;
while (text_begin < data->text().size())
{
unsigned sub_text_px = 0;
auto sub_text_len = _m_fit_text(graph, data->text().substr(text_begin), rs.allowed_width, sub_text_px);
if (text_begin + sub_text_len < data->text().size())
{
//make a new visual line
#ifdef _nana_std_has_returnable_emplace_back
auto & vsline = rs.vslines.emplace_back();
#else
rs.vslines.emplace_back();
auto & vsline = rs.vslines.back();
#endif
_m_prepare_x(rs, vsline, sub_text_px);
vsline.extent_height_px = max_content_height;
vsline.baseline = max_ascent;
vsline.elements.emplace_back(i, text_begin, sub_text_len);
}
else
{
//the last part, write it to vsline_elements to keep the status for next line element(next i)
vsline_elements.emplace_back(i, text_begin, sub_text_len);
text_pos = sub_text_px;
}
text_begin += sub_text_len;
}
}
else
{
//the last part, write it to vsline_elements to keep the status for next line element(next i)
vsline_elements.emplace_back(i, 0, 0);
text_pos = static_cast<int>(i->data_ptr->size().width);
}
}
if (!vsline_elements.empty())
{
#ifdef _nana_std_has_returnable_emplace_back
auto & vsline = rs.vslines.emplace_back();
#else
rs.vslines.emplace_back();
auto & vsline = rs.vslines.back();
#endif
_m_prepare_x(rs, vsline, static_cast<unsigned>(text_pos));
if (max_ascent + max_descent > max_content_height)
max_content_height = max_descent + max_ascent;
else
max_ascent = max_content_height - max_descent;
vsline.extent_height_px = max_content_height;
vsline.baseline = max_ascent;
vsline.elements.swap(vsline_elements);
}
return abs_text_px;
}
//Get the length of characters in a text whose length in pixels doesn't beyond the limited width.
static unsigned _m_fit_text(graph_reference graph, const std::wstring& text, unsigned limited_width_px, unsigned& text_px) noexcept
{
#ifdef _nana_std_has_string_view
auto pxbuf = graph.glyph_pixels(text);
#else
std::unique_ptr<unsigned[]> pxbuf(new unsigned[text.size()]);
graph.glyph_pixels(text.c_str(), text.size(), pxbuf.get());
#endif
text_px = 0;
for (std::size_t i = 0; i < text.size(); ++i)
{
if (text_px + pxbuf[i] > limited_width_px)
return i;
text_px += pxbuf[i];
}
return text.size();
}
#else
unsigned _m_line_pixels(dstream::linecontainer& line, unsigned def_line_pixels, render_status & rs)
{
if (line.empty())
@@ -441,7 +716,9 @@ namespace nana
}
return total_w;
}
#endif
#ifndef VISUAL_LINES
bool _m_each_line(graph_reference graph, dstream::linecontainer&, render_status& rs)
{
std::wstring text;
@@ -501,7 +778,36 @@ namespace nana
}
return (rs.pos.y <= lastpos);
}
#else
bool _m_foreach_visual_line(graph_reference graph, render_status& rs)
{
std::wstring text;
content_element_iterator block_start;
auto const bottom = static_cast<int>(graph.height()) - 1;
for (auto & vsline : rs.vslines)
{
rs.pos.x = vsline.x_base;
for (auto& content_elm : vsline.elements)
{
_m_draw_vsline_element(graph, content_elm, rs);
}
++rs.index; //next line index
rs.pos.y += vsline.extent_height_px;
if (rs.pos.y > bottom)
return false;
}
return (rs.pos.y <= bottom);
}
#endif
#if 0 //deprecated
static bool _m_overline(const render_status& rs, int right, bool equal_required) noexcept
{
if(align::left == rs.text_align)
@@ -509,7 +815,24 @@ namespace nana
return (equal_required ? rs.pixels[rs.index].x_base <= 0 : rs.pixels[rs.index].x_base < 0);
}
#endif
#ifdef VISUAL_LINES
static int _m_vsline_element_top(const visual_line& vsline, fblock* fblock_ptr, const data* data_ptr) noexcept
{
switch (fblock_ptr->text_align)
{
case fblock::aligns::center:
return static_cast<int>(vsline.extent_height_px - data_ptr->size().height) / 2;
case fblock::aligns::bottom:
return static_cast<int>(vsline.extent_height_px - data_ptr->size().height);
case fblock::aligns::baseline:
return static_cast<int>(vsline.baseline - (data_ptr->is_text() ? data_ptr->ascent() : data_ptr->size().height));
default: break;
}
return 0;
}
#else
static int _m_text_top(const pixel_tag& px, fblock* fblock_ptr, const data* data_ptr)
{
switch(fblock_ptr->text_align)
@@ -524,7 +847,52 @@ namespace nana
}
return 0;
}
#endif
#ifdef VISUAL_LINES
void _m_draw_vsline_element(graph_reference graph, const visual_line::element& vsline_elm, render_status& rs)
{
auto data = vsline_elm.content_element->data_ptr;
auto fblock = vsline_elm.content_element->fblock_ptr;
if (data->is_text())
{
auto const text = data->text().c_str() + vsline_elm.range.first;
auto const reordered = unicode_reorder(text, vsline_elm.range.second);
_m_change_font(graph, fblock);
for (auto & bidi : reordered)
{
auto extent_size = data->size();
#ifdef _nana_std_has_string_view
std::wstring_view text_sv{ bidi.begin, static_cast<std::size_t>(bidi.end - bidi.begin) };
if (data->text().size() != text_sv.size())
extent_size = graph.text_extent_size(text_sv);
const int y = rs.pos.y + _m_vsline_element_top(rs.vslines[rs.index], fblock, data);
graph.string({ rs.pos.x, y }, text_sv, _m_fgcolor(fblock));
#else
std::wstring text{ bidi.begin, static_cast<std::size_t>(bidi.end - bidi.begin) };
if (data->text().size() != text.size())
extent_size = graph.text_extent_size(text);
const int y = rs.pos.y + _m_vsline_element_top(rs.vslines[rs.index], fblock, data);
graph.string({ rs.pos.x, y }, text, _m_fgcolor(fblock));
#endif
_m_insert_if_traceable(rs.pos.x, y, extent_size, fblock);
rs.pos.x += static_cast<int>(extent_size.width);
}
}
else
{
int y = rs.pos.y + _m_vsline_element_top(rs.vslines[rs.index], fblock, data);
data->nontext_render(graph, rs.pos.x, y);
_m_insert_if_traceable(rs.pos.x, y, data->size(), fblock);
rs.pos.x += static_cast<int>(data->size().width);
}
}
#else
void _m_draw_block(graph_reference graph, const std::wstring& s, dstream::linecontainer::iterator block_start, render_status& rs)
{
auto const reordered = unicode_reorder(s.data(), s.length());
@@ -550,9 +918,35 @@ namespace nana
fblock * fblock_ptr = i->fblock_ptr;
data * data_ptr = i->data_ptr;
#if 1
const int range_text_area = static_cast<int>(rs.allowed_width) - rs.pos.x;
_m_change_font(graph, fblock_ptr);
auto text_extent_size = data_ptr->size();
#ifndef _nana_std_has_string_view
std::wstring_view text_sv{ data_ptr->text().c_str() + text_range.first, text_range.second };
if (data_ptr->text().size() != text_sv.size())
text_extent_size = graph.text_extent_size(text_sv);
#else
auto text_sv = data_ptr->text().substr(text_range.first, text_range.second);
if (data_ptr->text().size() != text_sv.size())
text_extent_size = graph.text_extent_size(text_sv);
#endif
if ((static_cast<int>(text_extent_size.width) > range_text_area) && (rs.pos.x != px.x_base))
{
//Change a new line
rs.pos.y += static_cast<int>(px.pixels);
px = rs.pixels[++rs.index];
rs.pos.x = px.x_base;
}
const int y = rs.pos.y + _m_text_top(px, fblock_ptr, data_ptr);
graph.string({ rs.pos.x, y }, text_sv, _m_fgcolor(fblock_ptr));
#else
const int w = static_cast<int>(rs.allowed_width) - rs.pos.x;
nana::size sz = data_ptr->size();
if ((static_cast<int>(sz.width) > w) && (rs.pos.x != px.x_base))
nana::size text_extent_size = data_ptr->size();
if ((static_cast<int>(text_extent_size.width) > w) && (rs.pos.x != px.x_base))
{
//Change a new line
rs.pos.y += static_cast<int>(px.pixels);
@@ -569,7 +963,7 @@ namespace nana
if (text_range.second != text_sv.size())
{
text_sv = text_sv.substr(text_range.first, text_range.second);
sz = graph.text_extent_size(text_sv);
text_extent_size = graph.text_extent_size(text_sv);
}
graph.string({ rs.pos.x, y }, text_sv, _m_fgcolor(fblock_ptr));
@@ -581,15 +975,15 @@ namespace nana
else
{
auto str = data_ptr->text().substr(text_range.first, text_range.second);
sz = graph.text_extent_size(str);
text_extent_size = graph.text_extent_size(str);
graph.string({ rs.pos.x, y }, str, _m_fgcolor(fblock_ptr));
}
#endif
#endif //#if 0
_m_insert_if_traceable(rs.pos.x, y, sz, fblock_ptr);
rs.pos.x += static_cast<int>(sz.width);
_m_insert_if_traceable(rs.pos.x, y, text_extent_size, fblock_ptr);
rs.pos.x += static_cast<int>(text_extent_size.width);
if(text_range.second < len)
{
@@ -601,6 +995,7 @@ namespace nana
}
}
}
#endif //VISUAL_LINES
static std::pair<std::size_t, std::size_t> _m_locate(dstream::linecontainer::iterator& i, std::size_t pos)
{