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textbox.cpp
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textbox.cpp
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/***************************************************************************
* Copyright (C) 2022,2024 by Daniele Cattaneo *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* As a special exception, if other files instantiate templates or use *
* macros or inline functions from this file, or you compile this file *
* and link it with other works to produce a work based on this file, *
* this file does not by itself cause the resulting work to be covered *
* by the GNU General Public License. However the source code for this *
* file must still be made available in accordance with the GNU General *
* Public License. This exception does not invalidate any other reasons *
* why a work based on this file might be covered by the GNU General *
* Public License. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, see <http://www.gnu.org/licenses/> *
***************************************************************************/
#include "textbox.h"
#include "misc_inst.h"
#include <utility>
#include <cctype>
using namespace mxgui;
struct LineEndPos
{
const char *nextChar;
short lineWidth;
};
static inline LineEndPos computeLineEnd_charWrap(const Font& font, const char *first, short maxWidth)
{
short lineWidth=0;
char32_t c;
const char *next=first, *cur=first;
while((c=miosix::Unicode::nextUtf8(next))!='\0')
{
// If newline character exit.
// The first character of the next line is the one after the newline.
if(c=='\n') return LineEndPos{next, lineWidth};
// If this character exceeds line width, exit.
short width=font.calculateLength(c);
if (lineWidth+width>maxWidth)
{
// The first character doesn't fit, make it fit forcefully.
if(lineWidth==0) return LineEndPos{next, maxWidth};
// The first character of the next line is the current one.
return LineEndPos{cur, lineWidth};
}
// Not at the end of the line yet
lineWidth+=width;
cur=next;
}
// End of the string
return LineEndPos{cur, lineWidth};
}
static inline LineEndPos computeLineEnd_wordWrap(const Font& font, const char *first, short maxWidth)
{
// Cache the width of a single space for speed
const short spaceWidth=font.calculateLength(' ');
short lineWidth=0;
short lastInterwordSpacing=0;
bool firstWord=true;
const char *next=first, *cur=next;
char32_t c=miosix::Unicode::nextUtf8(next);
while(c!='\0')
{
// If newline character exit, next character is already in p
if(c=='\n') return LineEndPos{next, lineWidth};
// Compute the length of the next word
const char *wordStart=cur;
short wordWidth=0;
while(c!='\0' && c!=' ' && c!='\n')
{
wordWidth+=font.calculateLength(c);
cur=next;
c=miosix::Unicode::nextUtf8(next);
}
// If this word makes us exceed the end of the line, exit
if(lineWidth+lastInterwordSpacing+wordWidth>maxWidth) { cur=wordStart; break; }
lineWidth+=lastInterwordSpacing+wordWidth;
firstWord=false;
lastInterwordSpacing=0;
// Perform char wrap for spaces.
while(c==' ')
{
// When a space exceeds the width of a line, transform it into a
// newline
if(lineWidth+lastInterwordSpacing+spaceWidth>maxWidth)
return LineEndPos{next, (short)(lineWidth+lastInterwordSpacing)};
lastInterwordSpacing+=spaceWidth;
cur=next;
c=miosix::Unicode::nextUtf8(next);
}
}
if(firstWord && cur==first) return computeLineEnd_charWrap(font, first, maxWidth);
return LineEndPos{cur, lineWidth};
}
const char *TextBox::draw(DrawingContext& dc, Point p0, Point p1,
const char *str, unsigned int options,
unsigned short topMargin, unsigned short leftMargin,
unsigned short rightMargin, unsigned short bottomMargin,
int scrollY)
{
unsigned short left=p0.x(), top=p0.y();
unsigned short right=p1.x(), btm=p1.y();
const Color bgColor = dc.getBackground();
if (topMargin>0) dc.clear(Point(left,top),Point(right,top+topMargin-1), bgColor);
top+=topMargin;
if (leftMargin>0) dc.clear(Point(left,top), Point(left+leftMargin-1,btm), bgColor);
left+=leftMargin;
if (rightMargin>0) dc.clear(Point(right-rightMargin+1,top), Point(right,btm), bgColor);
right-=rightMargin;
if (bottomMargin>0) dc.clear(Point(left,btm-bottomMargin+1), Point(right,btm), bgColor);
btm-=bottomMargin;
return TextBox::draw(dc, Point(left,top), Point(right,btm), str, options, scrollY);
}
const char *TextBox::draw(DrawingContext& dc, Point p0, Point p1,
const char *str, unsigned int options, int scrollY)
{
int left=p0.x(), top=p0.y(), right=p1.x(), btm=p1.y();
const Font font = dc.getFont();
const Color bgColor = dc.getBackground();
const int lineHeight = font.getHeight();
const bool withBG = (options & BackgroundMask)==BoxBackground;
const bool withClip = (options & PartialLinesMask)==ClipPartialLines;
int lineTop=top-scrollY;
if (withBG && lineTop>top) dc.clear(Point(left,top), Point(right,std::min(lineTop-1,btm)), bgColor);
const char *cur=str;
int stopY = withClip ? btm : btm-lineHeight;
while(*cur!='\0' && lineTop<=stopY)
{
LineEndPos end;
if ((options&WrapMask)==WordWrap) end=computeLineEnd_wordWrap(font, cur, right-left+1);
else end=computeLineEnd_charWrap(font, cur, right-left+1);
const int lineBottom=std::min(lineTop+lineHeight, btm+1);
if(!withClip && lineTop<top && lineBottom>top)
{
if (withBG) dc.clear(Point(left,top), Point(right,lineBottom-1), bgColor);
}
else if(lineBottom>lineTop && lineBottom>top)
{
int realLineTop = std::max(lineTop,top);
if ((options&AlignmentMask) == LeftAlignment)
{
const short textRight=left+end.lineWidth-1;
dc.clippedWrite(Point(left,lineTop), Point(left,realLineTop), Point(textRight,lineBottom-1), cur);
if (withBG && textRight+1<=right) dc.clear(Point(textRight+1,realLineTop), Point(right,lineBottom-1), bgColor);
}
if ((options&AlignmentMask) == CenterAlignment)
{
const short leftPadding=((right-left)-end.lineWidth)/2;
const short textLeft=left+leftPadding;
const short rightBoxLeft=textLeft+end.lineWidth;
if (withBG && leftPadding>0) dc.clear(Point(left,realLineTop), Point(textLeft-1,lineBottom-1), bgColor);
dc.clippedWrite(Point(textLeft,lineTop), Point(textLeft,realLineTop), Point(rightBoxLeft-1,lineBottom-1), cur);
if (withBG && rightBoxLeft<=right) dc.clear(Point(rightBoxLeft,realLineTop), Point(right,lineBottom-1), bgColor);
}
if ((options&AlignmentMask) == RightAlignment)
{
const short textLeft=right-end.lineWidth+1;
if (withBG && textLeft>left) dc.clear(Point(left,realLineTop), Point(textLeft-1,lineBottom-1), bgColor);
dc.clippedWrite(Point(textLeft,lineTop), Point(textLeft,realLineTop), Point(right,lineBottom-1), cur);
}
}
lineTop=lineBottom;
cur=end.nextChar;
}
if (withBG && lineTop<=btm) dc.clear(Point(left,std::max(top,lineTop)), Point(right,btm), bgColor);
return cur;
}