GUITextArea.cpp
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GUITextArea.cpp
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	/*
	* Copyright (C) 2011-2012 Me and My Shadow
	*
	* This file is part of Me and My Shadow.
	*
	* Me and My Shadow 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 3 of the License, or
	* (at your option) any later version.
	*
	* Me and My Shadow 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with Me and My Shadow. If not, see <http://www.gnu.org/licenses/>.
	*/

	#include "Functions.h"
	#include "GUITextArea.h"
	#include "ThemeManager.h"
	#include <cmath>
	#include <algorithm>
	#include <assert.h>
	#include <ctype.h>
	#include <SDL_ttf_fontfallback.h>

	using namespace std;

	#define SPACE_PER_TAB 2

	GUITextArea::GUITextArea(ImageManager& imageManager, SDL_Renderer& renderer,int left,int top,int width,int height,bool enabled,bool visible):
	GUIObject(imageManager,renderer,left,top,width,height,NULL,-1,enabled,visible),editable(true){

	//Set some default values.
	state=0;
	setFont(fontText);

	highlightLineStart=highlightLineEnd=0;
	highlightStartX=highlightEndX=0;
	highlightStart=highlightEnd=0;

	//Add empty text.
	lines.push_back("");
	linesCache.push_back(nullptr);

	//Create scrollbar widget.
	scrollBar=new GUIScrollBar(imageManager,renderer,width-16,0,16,height,1,0,0,0);
	childControls.push_back(scrollBar);

	scrollBarH=new GUIScrollBar(imageManager,renderer,0,height-16,width-16,16,0,0,0,0,100,500,true,false);
	childControls.push_back(scrollBarH);
	}

	void GUITextArea::setFont(TTF_Font* font){
	//NOTE: This fuction shouldn't be called after adding items, so no need to update the whole cache.
	widgetFont=font;
	fontHeight=TTF_FontHeight(font)+1;
	}

	void GUITextArea::inputText(SDL_Renderer &renderer, const char* s) {
	if (s && s[0]) {
	//Split into lines.
	vector<string> newLines;
	newLines.push_back(std::string());
	for (int i = 0; s[i]; i++) {
	if (s[i] == '\r') continue;
	if (s[i] == '\n') {
	newLines.push_back(std::string());
	continue;
	}
	if (s[i] == '\t') {
	// Replace tabs by spaces.
	newLines.back() += std::string(SPACE_PER_TAB, ' ');
	continue;
	}
	newLines.back().push_back(s[i]);
	}

	const int m = newLines.size();

	if (m == 1 && newLines[0].empty()) return;

	//Remove selected text.
	removeHighlight(renderer);

	//Calculate the width of the last line.
	int advance = 0;
	{
	const char* lastLine = newLines[m - 1].c_str();
	for (int i = 0;;) {
	int a = 0;
	int ch = utf8ReadForward(lastLine, i);
	if (ch <= 0) break;
	TTF_GlyphMetrics(widgetFont, ch, NULL, NULL, NULL, NULL, &a);
	advance += a;
	}
	}

	if (m > 1) {
	//Multiple lines.
	highlightEnd = newLines[m - 1].size();
	highlightStartX = highlightEndX = advance;

	newLines[m - 1] += lines[highlightLineStart].substr(highlightStart);
	lines[highlightLineStart] = lines[highlightLineStart].substr(0, highlightStart) + newLines[0];

	lines.insert(lines.begin() + (highlightLineStart + 1), newLines.begin() + 1, newLines.end());
	for (int i = 0; i < m - 1; i++) {
	linesCache.insert(linesCache.begin() + (highlightLineStart + 1), nullptr);
	}

	highlightStart = highlightEnd;
	} else {
	//Single line.
	highlightEnd = highlightStart + newLines[0].size();

	lines[highlightLineStart].insert(highlightStart, newLines[0]);

	highlightStart = highlightEnd;
	highlightStartX = highlightEndX = highlightStartX + advance;
	}

	//Update cache.
	highlightLineEnd = highlightLineStart + m - 1;
	for (int i = highlightLineStart; i <= highlightLineEnd; i++) {
	linesCache[i] = textureFromText(renderer, *widgetFont, lines[i].c_str(), objThemes.getTextColor(true));
	}
	highlightLineStart = highlightLineEnd;

	//Update view if needed.
	adjustView();

	//If there is an event callback then call it.
	if (eventCallback){
	GUIEvent e = { eventCallback, name, this, GUIEventChange };
	GUIEventQueue.push_back(e);
	}
	}
	}

	void GUITextArea::scrollScrollbar(int dx, int dy) {
	if (dx && scrollBarH->visible){
	scrollBarH->value = clamp(scrollBarH->value + dx, 0, scrollBarH->maxValue);
	}
	if (dy) {
	scrollBar->value = clamp(scrollBar->value + dy, 0, scrollBar->maxValue);
	}
	}

	bool GUITextArea::handleEvents(SDL_Renderer& renderer,int x,int y,bool enabled,bool visible,bool processed){
	//Boolean if the event is processed.
	bool b=processed;

	//The GUIObject is only enabled when he and his parent are enabled.
	enabled=enabled && this->enabled;
	//The GUIObject is only enabled when he and his parent are enabled.
	visible=visible && this->visible;

	//Get the absolute position.
	x+=left;
	y+=top;

	//Update the vertical scrollbar.
	b=b\|\|scrollBar->handleEvents(renderer,x,y,enabled,visible,b);

	//NOTE: We don't reset the state to have a "focus" effect.
	//Only check for events when the object is both enabled and visible.
	if(enabled&&visible){
	//Check if there's a key press and the event hasn't been already processed.
	if(state==2 && event.type==SDL_KEYDOWN && !b && editable){
	if ((event.key.keysym.mod & KMOD_CTRL) == 0) {
	//Check if the key is supported.
	if (event.key.keysym.sym == SDLK_BACKSPACE){
	//Delete one character direct to prevent a lag.
	backspaceChar(renderer);
	} else if (event.key.keysym.sym == SDLK_DELETE){
	//Delete one character direct to prevent a lag.
	deleteChar(renderer);
	} else if (event.key.keysym.sym == SDLK_RETURN){
	removeHighlight(renderer);
	//Split the current line and update.
	string str2 = lines.at(highlightLineEnd).substr(highlightStart);
	lines.at(highlightLineStart) = lines.at(highlightLineStart).substr(0, highlightStart);

	linesCache.at(highlightLineStart) =
	textureFromText(renderer, *widgetFont, lines.at(highlightLineStart).c_str(), objThemes.getTextColor(true));

	//Calculate indentation.
	int indent = 0;
	for (int i = 0; i < (int)lines.at(highlightLineStart).length(); i++){
	if (isspace(lines.at(highlightLineStart)[i]))
	indent++;
	else
	break;
	}
	str2.insert(0, indent, ' ');

	//Add the rest in a new line.
	highlightLineStart++;
	highlightStart = indent;
	highlightEnd = highlightStart;
	highlightLineEnd++;

	highlightStartX = 0;
	for (int i = 0; i < indent; i++){
	int advance;
	TTF_GlyphMetrics(widgetFont, str2.at(i), NULL, NULL, NULL, NULL, &advance);
	highlightStartX += advance;
	}
	highlightEndX = highlightStartX;

	lines.insert(lines.begin() + highlightLineStart, str2);

	auto tex = textureFromText(renderer, *widgetFont, str2.c_str(), objThemes.getTextColor(true));
	linesCache.insert(linesCache.begin() + highlightLineStart, std::move(tex));


	adjustView();

	//If there is an event callback then call it.
	if (eventCallback){
	GUIEvent e = { eventCallback, name, this, GUIEventChange };
	GUIEventQueue.push_back(e);
	}
	} else if (event.key.keysym.sym == SDLK_TAB){
	//Calculate the width of a space.
	int advance;
	TTF_GlyphMetrics(widgetFont, ' ', NULL, NULL, NULL, NULL, &advance);

	int start = highlightLineStart, end = highlightLineEnd;
	if (start > end) std::swap(start, end);

	for (int line = start; line <= end; line++) {
	int count = 0;
	std::string &s = lines[line];
	if (event.key.keysym.mod & KMOD_SHIFT) {
	// remove spaces
	for (; count < SPACE_PER_TAB; count++) {
	if (s.c_str()[count] != ' ') break;
	}
	if (count > 0) {
	s.erase(0, count);
	count = -count;
	}
	} else {
	// add spaces
	count = SPACE_PER_TAB;
	s.insert(0, count, ' ');
	}

	//Update cache.
	if (count) {
	linesCache.at(line) = textureFromText(renderer, *widgetFont, s.c_str(), objThemes.getTextColor(true));
	}

	//Update selection.
	if (line == highlightLineStart) {
	highlightStart += count;
	highlightStartX += count*advance;
	if (highlightStart <= 0) {
	highlightStart = 0;
	highlightStartX = 0;
	}
	}
	if (line == highlightLineEnd) {
	highlightEnd += count;
	highlightEndX += count*advance;
	if (highlightEnd <= 0) {
	highlightEnd = 0;
	highlightEndX = 0;
	}
	}
	}

	adjustView();
	} else if (event.key.keysym.sym == SDLK_RIGHT){
	//Move the carrot once to prevent a lag.
	moveCarrotRight();
	} else if (event.key.keysym.sym == SDLK_LEFT){
	//Move the carrot once to prevent a lag.
	moveCarrotLeft();
	} else if (event.key.keysym.sym == SDLK_DOWN){
	//Move the carrot once to prevent a lag.
	moveCarrotDown();
	} else if (event.key.keysym.sym == SDLK_UP){
	//Move the carrot once to prevent a lag.
	moveCarrotUp();
	}
	} else {
	//Check hotkey.
	if (event.key.keysym.sym == SDLK_a) {
	//Select all.
	highlightLineStart = 0;
	highlightStart = 0;
	highlightStartX = 0;
	highlightLineEnd = lines.size() - 1;
	highlightEnd = lines.back().size();
	highlightEndX = 0;
	if (highlightEnd > 0) {
	TTF_SizeUTF8(widgetFont, lines.back().c_str(), &highlightEndX, NULL);
	}
	} else if (event.key.keysym.sym == SDLK_x \|\| event.key.keysym.sym == SDLK_c) {
	//Cut or copy.
	int startLine = highlightLineStart, endLine = highlightLineEnd;
	int start = highlightStart, end = highlightEnd;
	if (startLine > endLine \|\| (startLine == endLine && start > end)) {
	std::swap(startLine, endLine);
	std::swap(start, end);
	}

	std::string s;

	if (startLine < endLine) {
	//Multiple lines.
	s = lines[startLine].substr(start);
	s.push_back('\n');
	for (int i = startLine + 1; i < endLine; i++) {
	s += lines[i];
	s.push_back('\n');
	}
	s += lines[endLine].substr(0, end);
	} else {
	//Single line.
	s = lines[startLine].substr(start, end - start);
	}

	if (!s.empty()) {
	SDL_SetClipboardText(s.c_str());
	if (event.key.keysym.sym == SDLK_x) {
	//Cut.
	removeHighlight(renderer);

	//If there is an event callback then call it.
	if (eventCallback){
	GUIEvent e = { eventCallback, name, this, GUIEventChange };
	GUIEventQueue.push_back(e);
	}
	}
	}
	} else if (event.key.keysym.sym == SDLK_v) {
	//Paste.
	if (SDL_HasClipboardText()) {
	char *s = SDL_GetClipboardText();
	inputText(renderer, s);
	SDL_free(s);
	}
	}
	}

	//The event has been processed.
	b=true;
	} else if (state == 2 && event.type == SDL_TEXTINPUT && !b && editable){
	inputText(renderer, event.text.text);
	} else if (state == 2 && event.type == SDL_TEXTEDITING && !b && editable){
	// TODO: process SDL_TEXTEDITING event
	}

	//The mouse location (x=i, y=j) and the mouse button (k).
	int i,j,k;
	k=SDL_GetMouseState(&i,&j);

	//Check if the mouse is inside the GUIObject.
	if(i>=x&&i<x+width&&j>=y&&j<y+height){
	//We can only increase our state. (nothing->hover->focus).
	if(state!=2){
	state=1;
	}

	//Check for mouse wheel scrolling.
	//Scroll horizontally if mouse is over the horizontal scrollbar.
	//Otherwise scroll vertically.
	if(event.type==SDL_MOUSEWHEEL && event.wheel.y) {
	if(j>=y+height-16&&scrollBarH->visible){
	scrollScrollbar(event.wheel.y < 0 ? 20 : -20, 0);
	}else{
	scrollScrollbar(0, event.wheel.y < 0 ? 1 : -1);
	}
	}

	//When mouse is not over the scrollbar.
	if(i<x+width-16&&j<(scrollBarH->visible?y+height-16:y+height)){
	if (editable) {
	//Update the cursor type.
	currentCursor = CURSOR_CARROT;

	if (((event.type == SDL_MOUSEBUTTONUP \|\| event.type == SDL_MOUSEBUTTONDOWN) && event.button.button == 1)
	\|\| (event.type == SDL_MOUSEMOTION && (k & SDL_BUTTON(1))))
	{
	//Move carrot to the place clicked.
	const int mouseLine = clamp((int)floor(float(j - y) / float(fontHeight)) + scrollBar->value, 0, lines.size() - 1);

	string* str = &lines.at(mouseLine);
	value = str->length();

	const int clickX = i - x + scrollBarH->value;
	int finalX = 0;
	int finalPos = str->length();

	for (int i = 0;;){
	int advance = 0;

	int i0 = i;
	int ch = utf8ReadForward(str->c_str(), i);
	if (ch <= 0) break;
	TTF_GlyphMetrics(widgetFont, ch, NULL, NULL, NULL, NULL, &advance);
	finalX += advance;

	if (clickX < finalX - advance / 2){
	finalPos = i0;
	finalX -= advance;
	break;
	}
	}

	if (event.type == SDL_MOUSEBUTTONUP){
	state = 2;
	highlightEnd = finalPos;
	highlightEndX = finalX;
	highlightLineEnd = mouseLine;
	} else if (event.type == SDL_MOUSEBUTTONDOWN){
	state = 2;
	highlightStart = highlightEnd = finalPos;
	highlightStartX = highlightEndX = finalX;
	highlightLineStart = highlightLineEnd = mouseLine;
	} else if (event.type == SDL_MOUSEMOTION){
	state = 2;
	highlightEnd = finalPos;
	highlightEndX = finalX;
	highlightLineEnd = mouseLine;
	}
	}
	} else {
	const int mouseLine = (int)floor(float(j - y) / float(fontHeight)) + scrollBar->value;
	if (mouseLine >= 0 && mouseLine < (int)hyperlinks.size()) {
	const int clickX = i - x + scrollBarH->value;
	for (const Hyperlink& lnk : hyperlinks[mouseLine]) {
	if (clickX >= lnk.startX && clickX < lnk.endX) {
	currentCursor = CURSOR_POINTING_HAND;
	if (event.type == SDL_MOUSEBUTTONDOWN && event.button.button == 1) {
	openWebsite(lnk.url);
	}
	break;
	}
	}
	}
	}
	}
	}else{
	//The mouse is outside the TextBox.
	//If we don't have focus but only hover we lose it.
	if(state==1){
	state=0;
	}

	//If it's a click event outside the textbox then we blur.
	if(event.type==SDL_MOUSEBUTTONUP && event.button.button==SDL_BUTTON_LEFT){
	//Set state to 0.
	state=0;
	}
	}
	}

	if(!editable)
	highlightLineStart=scrollBar->value;

	//Process child controls event except for the scrollbar.
	//That's why i starts at one.
	for(unsigned int i=1;i<childControls.size();i++){
	bool b1=childControls[i]->handleEvents(renderer,x,y,enabled,visible,b);

	//The event is processed when either our or the childs is true (or both).
	b=b\|\|b1;
	}
	return b;
	}

	void GUITextArea::removeHighlight(SDL_Renderer& renderer){
	if (highlightLineStart==highlightLineEnd) {
	if (highlightStart == highlightEnd) return;
	int start=highlightStart, end=highlightEnd, startx=highlightStartX;
	if(highlightStart>highlightEnd){
	start=highlightEnd;
	end=highlightStart;
	startx=highlightEndX;
	}
	std::string& str=lines.at(highlightLineStart);
	str.erase(start,end-start);

	highlightStart=highlightEnd=start;
	highlightStartX=highlightEndX=startx;

	// Update cache.
	linesCache.at(highlightLineStart) = textureFromText(renderer,*widgetFont,str.c_str(),objThemes.getTextColor(true));
	}else{
	int startLine=highlightLineStart, endLine=highlightLineEnd,
	start=highlightStart, end=highlightEnd, startx=highlightStartX;
	if(startLine>endLine){
	startLine=highlightLineEnd;
	endLine=highlightLineStart;
	start=highlightEnd;
	end=highlightStart;
	startx=highlightEndX;
	}

	lines[startLine] = lines[startLine].substr(0, start) + lines[endLine].substr(end);

	lines.erase(lines.begin() + startLine + 1, lines.begin() + endLine + 1);
	linesCache.erase(linesCache.begin() + startLine + 1, linesCache.begin() + endLine + 1);

	highlightLineStart=highlightLineEnd=startLine;
	highlightStart=highlightEnd=start;
	highlightStartX=highlightEndX=startx;

	// Update cache.
	linesCache.at(startLine) = textureFromText(renderer, *widgetFont, lines[startLine].c_str(), objThemes.getTextColor(true));
	}
	adjustView();
	}

	void GUITextArea::deleteChar(SDL_Renderer& renderer){
	if (highlightLineStart==highlightLineEnd && highlightStart==highlightEnd){
	if(highlightEnd>=(int)lines.at(highlightLineEnd).length()){
	if(highlightLineEnd<(int)lines.size()-1){
	highlightLineEnd++;
	highlightEnd=0;
	}
	} else {
	utf8ReadForward(lines.at(highlightLineEnd).c_str(), highlightEnd);
	}
	}
	removeHighlight(renderer);
	//If there is an event callback.
	if(eventCallback){
	GUIEvent e={eventCallback,name,this,GUIEventChange};
	GUIEventQueue.push_back(e);
	}
	}

	void GUITextArea::backspaceChar(SDL_Renderer& renderer){
	if(highlightLineStart==highlightLineEnd && highlightStart==highlightEnd){
	if(highlightStart<=0){
	if(highlightLineStart==0){
	highlightStart=0;
	}else{
	highlightLineStart--;
	highlightStart=lines.at(highlightLineStart).length();
	highlightStartX=0;
	if (highlightStart > 0) {
	TexturePtr& t = linesCache.at(highlightLineStart);
	if (t) highlightStartX = textureWidth(*t);
	}
	}
	}else{
	int advance = 0;

	int ch = utf8ReadBackward(lines.at(highlightLineStart).c_str(), highlightStart);
	if (ch > 0) TTF_GlyphMetrics(widgetFont, ch, NULL, NULL, NULL, NULL, &advance);

	highlightStartX -= advance;
	}
	}
	removeHighlight(renderer);

	//If there is an event callback.
	if(eventCallback){
	GUIEvent e={eventCallback,name,this,GUIEventChange};
	GUIEventQueue.push_back(e);
	}
	}

	void GUITextArea::moveCarrotRight(){
	if (highlightEnd>=(int)lines.at(highlightLineEnd).length()){
	if (highlightLineEnd<(int)lines.size()-1){
	highlightEnd=0;
	highlightEndX=0;
	highlightLineEnd++;
	}
	}else{
	int advance = 0;

	int ch = utf8ReadForward(lines.at(highlightLineEnd).c_str(), highlightEnd);
	if (ch > 0) TTF_GlyphMetrics(widgetFont, ch, NULL, NULL, NULL, NULL, &advance);

	highlightEndX += advance;
	}
	if((SDL_GetModState()&KMOD_SHIFT)==0){
	highlightLineStart=highlightLineEnd;
	highlightStart=highlightEnd;
	highlightStartX=highlightEndX;
	}
	adjustView();
	}

	void GUITextArea::moveCarrotLeft(){
	if (highlightEnd<=0){
	if (highlightLineEnd==0){
	highlightEnd=0;
	}else{
	highlightLineEnd--;
	highlightEnd=lines.at(highlightLineEnd).length();
	highlightEndX=0;
	if (highlightEnd > 0) {
	TexturePtr& t = linesCache.at(highlightLineEnd);
	if (t) highlightEndX = textureWidth(*t);
	}
	}
	}else{
	int advance = 0;

	int ch = utf8ReadBackward(lines.at(highlightLineEnd).c_str(), highlightEnd);
	if (ch > 0) TTF_GlyphMetrics(widgetFont, ch, NULL, NULL, NULL, NULL, &advance);

	highlightEndX -= advance;
	}
	if((SDL_GetModState()&KMOD_SHIFT)==0){
	highlightLineStart=highlightLineEnd;
	highlightStart=highlightEnd;
	highlightStartX=highlightEndX;
	}
	adjustView();
	}

	void GUITextArea::moveCarrotUp(){
	if(highlightLineEnd==0){
	highlightEnd=0;
	highlightEndX=0;
	}else{
	highlightLineEnd--;
	const std::string& str=lines.at(highlightLineEnd);

	//Find out closest match.
	int xPos=0;
	int i=0;
	for (;;){
	int advance = 0;

	int i0 = i;
	int ch = utf8ReadForward(str.c_str(), i);
	if (ch <= 0) break;
	TTF_GlyphMetrics(widgetFont, ch, NULL, NULL, NULL, NULL, &advance);
	xPos += advance;

	if(highlightEndX<xPos-advance/2){
	highlightEnd=i=i0;
	highlightEndX=xPos-advance;
	break;
	}
	}
	if (i == 0) {
	highlightEnd = highlightEndX = 0;
	} else if (i == str.length()){
	highlightEnd=str.length();
	highlightEndX=0;
	if (highlightEnd > 0) {
	TexturePtr& t = linesCache.at(highlightLineEnd);
	if (t) highlightEndX = textureWidth(*t);
	}
	}
	}
	if((SDL_GetModState()&KMOD_SHIFT)==0){
	highlightStart=highlightEnd;
	highlightStartX=highlightEndX;
	highlightLineStart=highlightLineEnd;
	}
	adjustView();
	}

	void GUITextArea::moveCarrotDown(){
	if(highlightLineEnd==lines.size()-1){
	highlightEnd=lines.at(highlightLineEnd).length();
	highlightEndX=0;
	if (highlightEnd > 0) {
	TexturePtr& t = linesCache.at(highlightLineEnd);
	if (t) highlightEndX = textureWidth(*t);
	}
	}else{
	highlightLineEnd++;
	string* str=&lines.at(highlightLineEnd);

	//Find out closest match.
	int xPos=0;
	int i = 0;
	for (;;){
	int advance = 0;

	int i0 = i;
	int ch = utf8ReadForward(str->c_str(), i);
	if (ch <= 0) break;
	TTF_GlyphMetrics(widgetFont, ch, NULL, NULL, NULL, NULL, &advance);
	xPos += advance;

	if (highlightEndX<xPos - advance / 2){
	highlightEnd = i = i0;
	highlightEndX = xPos - advance;
	break;
	}
	}
	if (i == 0) {
	highlightEnd = highlightEndX = 0;
	} else if (i == str->length()){
	highlightEnd=str->length();
	highlightEndX=0;
	TexturePtr& t = linesCache.at(highlightLineEnd);
	if(t) highlightEndX=textureWidth(*t);
	}
	}
	if((SDL_GetModState()&KMOD_SHIFT)==0){
	highlightStart=highlightEnd;
	highlightStartX=highlightEndX;
	highlightLineStart=highlightLineEnd;
	}
	adjustView();
	}

	void GUITextArea::adjustView(){
	//Adjust view to current line.
	if(fontHeight*(highlightLineEnd-scrollBar->value)+4>height-4)
	scrollBar->value=highlightLineEnd-3;
	else if(highlightLineEnd-scrollBar->value<0)
	scrollBar->value=highlightLineEnd;

	//Find out the lenght of the longest line.
	int maxWidth=0;
	for(const TexturePtr& tex: linesCache){
	if(tex) {
	const int texWidth = textureWidth(*tex.get());
	if(texWidth>width-16&&texWidth>maxWidth)
	maxWidth=texWidth;
	}
	}

	//We need the horizontal scrollbar if any line is too long.
	if(maxWidth>0){
	scrollBar->height=height-16;
	scrollBarH->visible=true;
	scrollBarH->maxValue=maxWidth-width+24;
	}else{
	scrollBar->height=height;
	scrollBarH->visible=false;
	scrollBarH->value=0;
	scrollBarH->maxValue=0;
	}

	//Adjust the horizontal view.
	int carrotX=0;
	for(int n=0;n<highlightEnd;){
	int advance = 0;

	int ch = utf8ReadForward(lines.at(highlightLineEnd).c_str(), n);
	if (ch <= 0) break;
	TTF_GlyphMetrics(widgetFont, ch, NULL, NULL, NULL, NULL, &advance);
	carrotX += advance;
	}
	if(carrotX>width-24)
	scrollBarH->value=scrollBarH->maxValue;
	else
	scrollBarH->value=0;

	//Update vertical scrollbar.
	int rh=height-(scrollBarH->visible?16:0);
	int m=lines.size(),n=(int)floor((float)rh/(float)fontHeight);
	if(m>n){
	scrollBar->maxValue=m-n;
	scrollBar->smallChange=1;
	scrollBar->largeChange=n;
	}else{
	scrollBar->value=0;
	scrollBar->maxValue=0;
	}
	}

	void GUITextArea::drawHighlight(SDL_Renderer& renderer, int x,int y,SDL_Rect r,SDL_Color color){
	if(r.x<x) {
	int tmp_w = r.w - x + r.x;
	if(tmp_w<=0) return;
	r.w = tmp_w;
	r.x = x;
	}
	if(r.x+r.w > x+width){
	int tmp_w=width-r.x+x;
	if(tmp_w<=0) return;
	r.w=tmp_w;
	}
	if(r.y<y){
	int tmp_h=r.h - y + r.y;
	if(tmp_h<=0) return;
	r.h=tmp_h;
	r.y = y;
	}
	if(r.y+r.h > y+height){
	int tmp_h=height-r.y+y;
	if(tmp_h<=0) return;
	r.h=tmp_h;
	}
	SDL_SetRenderDrawColor(&renderer, color.r, color.g, color.b, color.a);
	SDL_RenderFillRect(&renderer, &r);
	}

	void GUITextArea::render(SDL_Renderer& renderer, int x,int y,bool draw){
	//There's no need drawing the GUIObject when it's invisible.
	if(!visible\|\|!draw)
	return;

	//Get the absolute x and y location.
	x+=left;
	y+=top;

	{
	//Draw the box.
	const Uint32 color=0xFFFFFFFF;
	drawGUIBox(x,y,width,height,renderer,color);
	}

	//Place the highlighted area.
	SDL_Rect r;
	const SDL_Color color{128,128,128,255};
	if (editable) {
	if (highlightLineStart == highlightLineEnd){
	r.x = x - scrollBarH->value;
	r.y = y + ((highlightLineStart - scrollBar->value)*fontHeight);
	r.h = fontHeight;
	if (highlightStart < highlightEnd){
	r.x += highlightStartX;
	r.w = highlightEndX - highlightStartX;
	} else{
	r.x += highlightEndX;
	r.w = highlightStartX - highlightEndX;
	}
	drawHighlight(renderer, x, y, r, color);
	} else if (highlightLineStart < highlightLineEnd){
	int lnc = highlightLineEnd - highlightLineStart;
	for (int i = 0; i <= lnc; i++){
	r.x = x - scrollBarH->value;
	r.y = y + ((i + highlightLineStart - scrollBar->value)*fontHeight);
	r.w = width + scrollBarH->maxValue;
	r.h = fontHeight;
	if (i == 0){
	r.x += highlightStartX;
	r.w -= highlightStartX;
	} else if (i == lnc){
	r.w = highlightEndX;
	}
	if (lines.at(i + highlightLineStart).empty()){
	r.w = fontHeight / 4;
	}
	drawHighlight(renderer, x, y, r, color);
	}
	} else{
	int lnc = highlightLineStart - highlightLineEnd;
	for (int i = 0; i <= lnc; i++){
	r.x = x - scrollBarH->value;
	r.y = y + ((i + highlightLineEnd - scrollBar->value)*fontHeight);
	r.w = width + scrollBarH->maxValue;
	r.h = fontHeight;
	if (i == 0){
	r.x += highlightEndX;
	r.w -= highlightEndX;
	} else if (i == lnc){
	r.w = highlightStartX;
	}
	if (lines.at(i + highlightLineEnd).empty()){
	r.w = fontHeight / 4;
	}
	drawHighlight(renderer, x, y, r, color);
	}
	}
	}

	//Draw text.
	int lineY=0;
	for(int line=scrollBar->value;line<(int)linesCache.size();line++){
	TexturePtr& it = linesCache[line];
	if(it){
	if(lineY<height){
	SDL_Rect r = { scrollBarH->value, 0, std::min(width - 17, textureWidth(it.get()) - scrollBarH->value), textureHeight(it.get()) };
	int over=-height+lineY+fontHeight;
	if(over>0) r.h-=over;
	const SDL_Rect dstRect={x+1,y+1+lineY,r.w,r.h};
	if(r.w>0 && r.h>0) SDL_RenderCopy(&renderer,it.get(),&r,&dstRect);

	// draw hyperlinks
	if (!editable && line<(int)hyperlinks.size()) {
	r.y = lineY + fontHeight - 1;
	if (r.y < height){
	r.y += y + 1;
	r.h = 1;
	for (const Hyperlink& lnk : hyperlinks[line]) {
	r.x = clamp(lnk.startX - scrollBarH->value, 0, width - 17);
	r.w = clamp(lnk.endX - scrollBarH->value, 0, width - 17);
	if (r.w > r.x) {
	r.w -= r.x;
	r.x += x + 1;
	SDL_SetRenderDrawColor(&renderer, 0, 0, 0, 255);
	SDL_RenderFillRect(&renderer, &r);
	}
	}
	}
	}
	}else{
	break;
	}
	}
	lineY+=fontHeight;
	}

	//Only draw the carrot when focus.
	if(state==2&&editable){
	r.x=x-scrollBarH->value+highlightEndX;
	r.y=y+4+fontHeight*(highlightLineEnd-scrollBar->value);
	r.w=2;
	r.h=fontHeight-4;

	//Make sure that the carrot is inside the textbox.
	if((r.y<y+height-4)&&(r.y>y)&&(r.x>x-1)&&(r.x<x+width-16)){
	drawHighlight(renderer,x,y,r,SDL_Color{0,0,0,127});
	}
	}

	//We now need to draw all the children of the GUIObject.
	for(unsigned int i=0;i<childControls.size();i++){
	childControls[i]->render(renderer,x,y,draw);
	}
	}

	void GUITextArea::addString(SDL_Renderer& renderer, const std::string& input, bool wordWrap) {
	if (wordWrap && !input.empty()) {
	const size_t m = input.size();
	size_t lp = 0;
	std::string line;
	int lineWidth = 0;

	for (;;) {
	//A word consists of a sequence of white spaces and a sequence of non-white-spaces.

	//Initialize.
	size_t lps = lp, numberOfSpaces = 0;

	//Read white spaces.
	for (; lp < m; lp++) {
	if (input[lp] != ' ' && input[lp] != '\t') break;
	numberOfSpaces++;
	}

	//Read non-white-spaces.
	//TODO: For CJK should only read one CJK character (possibly with a punctuation mark)
	for (; lp < m; lp++) {
	if (input[lp] == ' ' \|\| input[lp] == '\t') break;
	}

	assert(lp > lps);

	if (line.empty()) {
	//A line consists of at least one word, so we append it forcefully.
	line = input.substr(lps, lp - lps);
	TTF_SizeUTF8(widgetFont, line.c_str(), &lineWidth, NULL);
	} else {
	//Calculate the width of the new word.
	std::string newWord = input.substr(lps, lp - lps);
	int newWidth;
	TTF_SizeUTF8(widgetFont, newWord.c_str(), &newWidth, NULL);

	//Check if it fits into current line.
	if (lineWidth + newWidth > width - 16) {
	//No, we output current line.
	lines.push_back(line);

	//And add a new line consisting of new word (but we remove spaces in it).
	if (numberOfSpaces > 0) {
	line = newWord.substr(numberOfSpaces);
	TTF_SizeUTF8(widgetFont, line.c_str(), &lineWidth, NULL);
	} else {
	line = newWord;
	lineWidth = newWidth;
	}
	} else {
	//Yes, we append the new word to current line.
	line.append(newWord);
	lineWidth += newWidth;
	}
	}

	//Check if we processed all the characters.
	if (lp >= m) break;
	}

	//Output the remaining text.
	if (!line.empty()) {
	lines.push_back(line);
	}
	} else {
	lines.push_back(input);
	}
	}

	void GUITextArea::setString(SDL_Renderer& renderer, const std::string& input, bool wordWrap) {
	//Clear previous content if any.
	//Delete every line.
	lines.clear();
	linesCache.clear();

	size_t linePos=0,lineLen=0;

	//Loop through the input string.
	for(size_t i=0;i<input.length();++i){
	//Check when we come in end of a line.
	if(input.at(i)=='\n'){
	//Check if the line is empty.
	if(lineLen==0){
	addString(renderer, std::string(), wordWrap);
	} else{
	//Read the whole line.
	addString(renderer, input.substr(linePos, lineLen), wordWrap);
	}
	//Skip '\n' in end of the line.
	linePos=i+1;
	lineLen=0;
	}else{
	lineLen++;
	}
	}

	//The string might not end with a newline.
	//That's why we're going to add end rest of the string as one line.
	addString(renderer, input.substr(linePos), wordWrap);

	//Render and cache text.
	for (const std::string& s : lines) {
	linesCache.push_back(textureFromText(renderer, *widgetFont, s.c_str(), objThemes.getTextColor(true)));
	}

	adjustView();
	}

	void GUITextArea::setStringArray(SDL_Renderer& renderer, const std::vector<std::string>& input, bool wordWrap) {
	//Free cached images.
	linesCache.clear();

	//Copy values.
	if (wordWrap) {
	lines.clear();
	for (const std::string& s : input) {
	addString(renderer, s, wordWrap);
	}
	} else {
	lines = input;
	}

	//Render and cache text.
	for(const std::string& s: lines) {
	linesCache.push_back(textureFromText(renderer,*widgetFont,s.c_str(),objThemes.getTextColor(true)));
	}

	adjustView();
	}

	void GUITextArea::extractHyperlinks() {
	const int lm = lines.size();
	hyperlinks.clear();

	if (lm <= 0) return;
	hyperlinks.resize(lm);

	for (int l = 0; l < lm; l++) {
	const char* s = lines[l].c_str();
	for (int i = 0, m = lines[l].size(); i < m; i++) {
	const int lps = i;
	std::string url;

	// we only support http or https
	if ((s[i] == 'H' \|\| s[i] == 'h')
	&& (s[i + 1] == 'T' \|\| s[i + 1] == 't')
	&& (s[i + 2] == 'T' \|\| s[i + 2] == 't')
	&& (s[i + 3] == 'P' \|\| s[i + 3] == 'p'))
	{
	if (s[i + 4] == ':' && s[i + 5] == '/' && s[i + 6] == '/') {
	// http
	i += 7;
	url = "http://";
	} else if ((s[i + 4] == 'S' \|\| s[i + 4] == 's') && s[i + 5] == ':' && s[i + 6] == '/' && s[i + 7] == '/') {
	// https
	i += 8;
	url = "https://";
	} else {
	continue;
	}
	for (; i < m; i++) {
	char c = s[i];
	// url ends with following character
	if (c == '\0' \|\| c == ' ' \|\| c == ')' \|\| c == ']' \|\| c == '}' \|\| c == '>' \|\| c == '\r' \|\| c == '\n' \|\| c == '\t') {
	break;
	}
	url.push_back(c);
	}
	} else {
	continue;
	}

	const int lpe = i;

	Hyperlink hyperlink = {};
	TTF_SizeUTF8(widgetFont, lines[l].substr(0, lps).c_str(), &hyperlink.startX, NULL);
	TTF_SizeUTF8(widgetFont, lines[l].substr(0, lpe).c_str(), &hyperlink.endX, NULL);
	hyperlink.url = lines[l].substr(lps, lpe - lps);

	hyperlinks[l].push_back(hyperlink);
	}
	}
	}

	string GUITextArea::getString(){
	string tmp;
	for(vector<string>::iterator it=lines.begin();it!=lines.end();++it){
	//Append a newline only if not the first line.
	if(it!=lines.begin())
	tmp.append(1,'\n');
	//Append the line.
	tmp.append(*it);
	}
	return tmp;
	}

	void GUITextArea::onResize(){
	scrollBar->left=width-16;
	scrollBar->height=height;

	if(scrollBarH->visible)
	scrollBar->height-=16;

	scrollBarH->top=height-16;
	scrollBarH->width=width-16;

	adjustView();
	}

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