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// Text.cc for FbTk - text utils
// Copyright (c) 2002 - 2006 Henrik Kinnunen (fluxgen at fluxbox dot org)
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
#include "TextUtils.hh"
#include "Font.hh"
#include "Theme.hh"
#include <cstring>
namespace {
// calcs longest substring of 'text', fitting into 'n_pixels'
// 'text_len' is an in-out parameter
// 'text_width' is out parameter
void maxTextLength(int n_pixels, const FbTk::Font& font, const char* const text,
unsigned int& text_len, int& text_width) {
text_width = font.textWidth(text, text_len);
// rendered text exceeds n_pixels. calculate 'len' to cut off 'text'.
if (text_width > n_pixels) {
// there is less room for thicker glyphs than for
// thin glyphs. 'text' contains usually a good mix of both. to decide
// upon where we cut off glyphs from 'text', we do a binary search
// over 'text' to find the optimal length that fits into 'n_pixels'.
//
// by assuming a text that consists of only thick glyphs ("WW") and
// a text that consist of only thin glyphs (".") we find a good
// start to binary search:
//
// +---right
// [...........|.R ]
// [WWWWWWWWWWL| ]
// +------left
// n_pixels
int right = n_pixels / (font.textWidth(".", 1) + 1);
int left = n_pixels / (font.textWidth("WW", 2) + 1);
int middle;
// binary search for longest substring fitting into 'max_width' pixels
for ( ; left < (right - 1); ) {
middle = left + ((right - left) / 2);
text_width = font.textWidth(text, middle);
if (text_width < n_pixels) {
left = middle;
} else {
right = middle;
}
}
text_len = left;
}
}
}
namespace FbTk {
int doAlignment(int n_pixels, int bevel, FbTk::Justify justify,
const FbTk::Font &font, const char * const text,
unsigned int textlen, unsigned int &newlen) {
if (text == 0 || textlen == 0)
return 0;
int text_width;
maxTextLength(n_pixels - bevel, font, text, textlen, text_width);
newlen = textlen;
if (justify == FbTk::RIGHT) {
return n_pixels - text_width;
} else if (justify == FbTk::CENTER) {
return (n_pixels - text_width + bevel)/2;
}
return bevel;
}
/// specialization for Justify
template <>
void ThemeItem<FbTk::Justify>::setDefaultValue() {
m_value = LEFT;
}
template <>
void ThemeItem<FbTk::Justify>::setFromString(const char *value) {
if (strcasecmp("center", value) == 0)
m_value = FbTk::CENTER;
else if (strcasecmp("right", value) == 0)
m_value = FbTk::RIGHT;
else // default
setDefaultValue();
}
// do nothing
template <>
void ThemeItem<FbTk::Justify>::load(const std::string *name, const std::string *altname) {
}
} // end namespace FbTk
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