GUIObject.cpp
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GUIObject.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 "UTF8Functions.h"
	#include "GUIObject.h"
	#include "ThemeManager.h"
	#include "InputManager.h"
	#include "GUIListBox.h"
	#include "GUISlider.h"
	#include <algorithm>
	#include <iostream>
	#include <list>
	#include <SDL_ttf_fontfallback.h>

	#include "Render.h"

	using namespace std;

	//Set the GUIObjectRoot to NULL.
	GUIObject* GUIObjectRoot=NULL;
	//Initialise the event queue.
	list<GUIEvent> GUIEventQueue;

	//A boolean variable used to skip next mouse up event for GUI (temporary workaround).
	bool GUISkipNextMouseUpEvent = false;

	GUIObject *GUIObjectWhichWillBringToFront = NULL;

	void GUIObjectHandleEvents(ImageManager& imageManager, SDL_Renderer& renderer, bool kill){
	//Check if we need to reset the skip variable.
	if (event.type == SDL_MOUSEBUTTONDOWN) {
	GUISkipNextMouseUpEvent = false;
	}

	//Reset temp variable.
	GUIObjectWhichWillBringToFront = NULL;

	//Check if we need to skip event.
	if (event.type == SDL_MOUSEBUTTONUP && GUISkipNextMouseUpEvent) {
	GUISkipNextMouseUpEvent = false;
	} else {
	//Make sure that GUIObjectRoot isn't null.
	if (GUIObjectRoot)
	GUIObjectRoot->handleEvents(renderer);
	}

	//Reset temp variable again.
	GUIObjectWhichWillBringToFront = NULL;

	//Check for SDL_QUIT.
	if(event.type==SDL_QUIT && kill){
	//We get a quit event so enter the exit state.
	setNextState(STATE_EXIT);
	delete GUIObjectRoot;
	GUIObjectRoot=NULL;
	return;
	}

	//Keep calling events until there are none left.
	while(!GUIEventQueue.empty()){
	//Get one event and remove it from the queue.
	GUIEvent e=GUIEventQueue.front();
	GUIEventQueue.pop_front();

	//If an eventCallback exist call it.
	if(e.eventCallback){
	e.eventCallback->GUIEventCallback_OnEvent(imageManager,renderer,e.name,e.obj,e.eventType);
	}
	}
	//We empty the event queue just to be sure.
	GUIEventQueue.clear();
	}

	GUIObject::GUIObject(ImageManager& imageManager, SDL_Renderer& renderer, int left, int top, int width, int height,
	const char* caption, int value,
	bool enabled, bool visible, int gravity) :
	left(left), top(top), width(width), height(height),
	gravity(gravity), value(value),
	enabled(enabled), visible(visible),
	eventCallback(NULL), state(0),
	cachedEnabled(enabled), gravityX(0),
	gravityLeft(0), gravityTop(0), gravityRight(0), gravityBottom(0)
	{
	//Make sure that caption isn't NULL before setting it.
	if (caption){
	GUIObject::caption = caption;
	//And set the cached caption.
	cachedCaption = caption;
	}

	if (width <= 0)
	autoWidth = true;
	else
	autoWidth = false;

	inDialog = false;

	//Load the gui images.
	bmGuiTex = imageManager.loadTexture(getDataPath() + "gfx/gui.png", renderer);
	}

	GUIObject::~GUIObject(){
	//We need to delete every child we have.
	for(unsigned int i=0;i<childControls.size();i++){
	delete childControls[i];
	}
	//Deleted the childs now empty the childControls vector.
	childControls.clear();
	}

	void GUIObject::addChild(GUIObject* obj){
	//Add widget add a child
	childControls.push_back(obj);

	//Copy inDialog boolean from parent.
	obj->inDialog = inDialog;
	}

	GUIObject* GUIObject::getChild(const std::string& name){
	//Look for a child with the name.
	for (unsigned int i = 0; i<childControls.size(); i++)
	if (childControls[i]->name == name)
	return childControls[i];

	//Not found so return NULL.
	return NULL;
	}

	bool GUIObject::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 its parent are enabled.
	enabled=enabled && this->enabled;
	//The GUIObject is only enabled when its parent are enabled.
	visible=visible && this->visible;

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

	//Also let the children handle their events.
	for (int i = childControls.size() - 1; i >= 0; 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;
	}

	//Check if we should bring some control to front.
	if (GUIObjectWhichWillBringToFront) {
	for (int i = childControls.size() - 1; i >= 0; i--) {
	if (childControls[i] == GUIObjectWhichWillBringToFront) {
	if (i < (int)childControls.size() - 1) {
	childControls.erase(childControls.begin() + i);
	childControls.push_back(GUIObjectWhichWillBringToFront);
	}
	GUIObjectWhichWillBringToFront = NULL;
	break;
	}
	}
	}

	return b;
	}

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

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

	//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 GUIObject::onResize() {
	}

	void GUIObject::refreshCache(bool enabled) {
	//Check if the enabled state changed or the caption, if so we need to clear the (old) cache.
	if(enabled!=cachedEnabled \|\| caption.compare(cachedCaption)!=0 \|\| width<=0){
	//TODO: Only change alpha if only enabled changes.
	//Free the cache.
	cacheTex.reset(nullptr);

	//And cache the new values.
	cachedEnabled=enabled;
	cachedCaption=caption;

	//Finally resize the widget
	if(autoWidth)
	width=-1;
	}
	}

	int GUIObject::getSelectedControl() {
	for (int i = 0; i < (int)childControls.size(); i++) {
	GUIObject *obj = childControls[i];
	if (obj && obj->visible && obj->enabled && obj->state) {
	if (dynamic_cast<GUITextBox*>(obj) && obj->state == 2) {
	return i;
	} else if (dynamic_cast<GUIButton>(obj) \|\| dynamic_cast<GUICheckBox>(obj)
	\|\| dynamic_cast<GUISingleLineListBox*>(obj)
	\|\| dynamic_cast<GUISlider*>(obj)
	)
	{
	return i;
	}
	}
	}

	return -1;
	}

	void GUIObject::setSelectedControl(int index) {
	for (int i = 0; i < (int)childControls.size(); i++) {
	GUIObject *obj = childControls[i];
	if (obj && obj->visible && obj->enabled) {
	if (dynamic_cast<GUIButton>(obj) \|\| dynamic_cast<GUICheckBox>(obj)) {
	//It's a button.
	obj->state = (i == index) ? 1 : 0;
	} else if (dynamic_cast<GUITextBox*>(obj)) {
	//It's a text box (or a spin box).
	if(i == index) {
	obj->state = 2;
	} else {
	dynamic_cast<GUITextBox*>(obj)->blur();
	}
	} else if (dynamic_cast<GUISingleLineListBox*>(obj)) {
	//It's a single line list box.
	obj->state = (i == index) ? 0x100 : 0;
	} else if (dynamic_cast<GUISlider*>(obj)) {
	//It's a slider.
	obj->state = (i == index) ? 0x10000 : 0;
	}
	}
	}
	}

	int GUIObject::selectNextControl(int direction, int selected) {
	//Get the index of currently selected control.
	if (selected == 0x80000000) {
	selected = getSelectedControl();
	}

	//Find the next control.
	for (int i = 0; i < (int)childControls.size(); i++) {
	if (selected < 0) {
	selected = 0;
	} else {
	selected += direction;
	if (selected >= (int)childControls.size()) {
	selected -= childControls.size();
	} else if (selected < 0) {
	selected += childControls.size();
	}
	}

	GUIObject *obj = childControls[selected];
	if (obj && obj->visible && obj->enabled) {
	if (dynamic_cast<GUIButton>(obj) \|\| dynamic_cast<GUICheckBox>(obj)
	\|\| dynamic_cast<GUITextBox*>(obj)
	\|\| dynamic_cast<GUISingleLineListBox*>(obj)
	\|\| dynamic_cast<GUISlider*>(obj)
	)
	{
	setSelectedControl(selected);
	return selected;
	}
	}
	}

	return -1;
	}

	bool GUIObject::handleKeyboardNavigationEvents(ImageManager& imageManager, SDL_Renderer& renderer, int keyboardNavigationMode) {
	if (keyboardNavigationMode == 0) return false;

	//Check operation on focused control. These have higher priority.
	if (isKeyboardOnly) {
	//Check enter key.
	if ((keyboardNavigationMode & ReturnControls) != 0 && inputMgr.isKeyDownEvent(INPUTMGR_SELECT)) {
	int index = getSelectedControl();
	if (index >= 0) {
	GUIObject *obj = childControls[index];

	if (dynamic_cast<GUIButton*>(obj)) {
	//It's a button.
	if (obj->eventCallback) {
	obj->eventCallback->GUIEventCallback_OnEvent(imageManager, renderer, obj->name, obj, GUIEventClick);
	}
	return true;
	}
	if (dynamic_cast<GUICheckBox*>(obj)) {
	//It's a check box.
	obj->value = obj->value ? 0 : 1;
	if (obj->eventCallback) {
	obj->eventCallback->GUIEventCallback_OnEvent(imageManager, renderer, obj->name, obj, GUIEventClick);
	}
	return true;
	}
	}
	}

	//Check left/right key.
	if ((keyboardNavigationMode & LeftRightControls) != 0 && (inputMgr.isKeyDownEvent(INPUTMGR_LEFT) \|\| inputMgr.isKeyDownEvent(INPUTMGR_RIGHT))) {
	int index = getSelectedControl();
	if (index >= 0) {
	GUIObject *obj = childControls[index];

	auto sllb = dynamic_cast<GUISingleLineListBox*>(obj);
	if (sllb) {
	//It's a single line list box.
	int newValue = sllb->value + (inputMgr.isKeyDownEvent(INPUTMGR_RIGHT) ? 1 : -1);
	if (newValue >= (int)sllb->item.size()) {
	newValue -= sllb->item.size();
	} else if (newValue < 0) {
	newValue += sllb->item.size();
	}

	if (sllb->value != newValue) {
	sllb->value = newValue;
	if (obj->eventCallback) {
	obj->eventCallback->GUIEventCallback_OnEvent(imageManager, renderer, obj->name, obj, GUIEventClick);
	}
	}
	return true;
	}

	auto slider = dynamic_cast<GUISlider*>(obj);
	if (slider) {
	//It's a slider.
	int newValue = slider->value + (inputMgr.isKeyDownEvent(INPUTMGR_RIGHT) ? slider->largeChange : -slider->largeChange);
	newValue = clamp(newValue, slider->minValue, slider->maxValue);

	if (slider->value != newValue) {
	slider->value = newValue;
	if (obj->eventCallback) {
	obj->eventCallback->GUIEventCallback_OnEvent(imageManager, renderer, obj->name, obj, GUIEventChange);
	}
	}
	return true;
	}
	}

	}
	}

	//Check if we need to exclude printable characters
	bool excludePrintable = false;
	{
	int index = getSelectedControl();
	if (index >= 0) {
	GUIObject *obj = childControls[index];
	if (dynamic_cast<GUITextBox*>(obj)) {
	excludePrintable = true;
	}
	}
	}

	//Check focus movement
	int m = SDL_GetModState();
	if (((keyboardNavigationMode & LeftRightFocus) != 0 && inputMgr.isKeyDownEvent(INPUTMGR_RIGHT, excludePrintable))
	\|\| ((keyboardNavigationMode & UpDownFocus) != 0 && inputMgr.isKeyDownEvent(INPUTMGR_DOWN, excludePrintable))
	\|\| ((keyboardNavigationMode & TabFocus) != 0 && inputMgr.isKeyDownEvent(INPUTMGR_TAB, excludePrintable) && (m & KMOD_SHIFT) == 0)
	)
	{
	isKeyboardOnly = true;
	selectNextControl(1);
	return true;
	} else if (((keyboardNavigationMode & LeftRightFocus) != 0 && inputMgr.isKeyDownEvent(INPUTMGR_LEFT, excludePrintable))
	\|\| ((keyboardNavigationMode & UpDownFocus) != 0 && inputMgr.isKeyDownEvent(INPUTMGR_UP, excludePrintable))
	\|\| ((keyboardNavigationMode & TabFocus) != 0 && inputMgr.isKeyDownEvent(INPUTMGR_TAB, excludePrintable) && (m & KMOD_SHIFT) != 0)
	)
	{
	isKeyboardOnly = true;
	selectNextControl(-1);
	return true;
	}

	return false;
	}

	//////////////GUIButton///////////////////////////////////////////////////////////////////

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

	//The widget is only enabled when its parent are enabled.
	enabled=enabled && this->enabled;
	//The widget is only enabled when its parent are enabled.
	visible=visible && this->visible;

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

	//We don't update button state under keyboard only mode.
	if (!isKeyboardOnly) {
	//Set state to 0.
	state = 0;

	//Only check for events when the object is both enabled and visible and the event hasn't been already processed.
	if (enabled && visible && !b) {
	//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 widget.
	if (i >= x && i < x + width && j >= y && j < y + height) {
	//We have hover so set state to one.
	state = 1;
	//Check for a mouse button press.
	if (k&SDL_BUTTON(1))
	state = 2;

	//Check if there's a mouse press.
	if (event.type == SDL_MOUSEBUTTONUP && event.button.button == SDL_BUTTON_LEFT) {
	//If event callback is configured then add an event to the queue.
	if (eventCallback) {
	GUIEvent e = { eventCallback, name, this, GUIEventClick };
	GUIEventQueue.push_back(e);
	}
	}

	//Event has been processed as long as this is a mouse event and the mouse is inside the widget.
	if ((event.type == SDL_MOUSEMOTION && event.motion.state == 0)
	\|\| event.type == SDL_MOUSEBUTTONDOWN \|\| event.type == SDL_MOUSEBUTTONUP \|\| event.type == SDL_MOUSEWHEEL)
	{
	b = true;
	}
	}
	}
	}

	return b;
	}

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

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

	refreshCache(enabled);

	//Get the text and make sure it isn't empty.
	const char* lp=caption.c_str();
	if(lp!=NULL && lp[0]){
	//Update cache if needed.
	if(!cacheTex){
	SDL_Color color = objThemes.getTextColor(inDialog);

	if(!smallFont) {
	cacheTex = textureFromText(renderer, *fontGUI, lp, color);
	} else {
	cacheTex = textureFromText(renderer, *fontGUISmall, lp, color);
	}
	//Make the widget transparent if it's disabled.
	if(!enabled) {
	SDL_SetTextureAlphaMod(cacheTex.get(), 128);
	}
	//Calculate proper size for the widget.
	if(width<=0){
	width=textureWidth(*cacheTex)+50;
	if(gravity==GUIGravityCenter){
	gravityX=int(width/2);
	}else if(gravity==GUIGravityRight){
	gravityX=width;
	}else{
	gravityX=0;
	}
	}
	}

	if(draw){
	//Center the text both vertically as horizontally.
	const SDL_Rect size = rectFromTexture(*cacheTex);
	const int drawX=x-gravityX+(width-size.w)/2;
	const int drawY=y+(height-size.h)/2-GUI_FONT_RAISE;

	//Check if the arrows don't fall of.
	if(size.w+32<=width){
	if(state==1){
	if(inDialog){
	applyTexture(x-gravityX+(width-size.w)/2+4+size.w+5,y+2,*arrowLeft2,renderer);
	applyTexture(x-gravityX+(width-size.w)/2-25,y+2,*arrowRight2,renderer);
	}else{
	applyTexture(x-gravityX+(width-size.w)/2+4+size.w+5,y+2,*arrowLeft1,renderer);
	applyTexture(x-gravityX+(width-size.w)/2-25,y+2,*arrowRight1,renderer);
	}
	}else if(state==2){
	if(inDialog){
	applyTexture(x-gravityX+(width-size.w)/2+4+size.w,y+2,*arrowLeft2,renderer);
	applyTexture(x-gravityX+(width-size.w)/2-20,y+2,*arrowRight2,renderer);
	}else{
	applyTexture(x-gravityX+(width-size.w)/2+4+size.w,y+2,*arrowLeft1,renderer);
	applyTexture(x-gravityX+(width-size.w)/2-20,y+2,arrowRight1,renderer);
	}
	}
	}

	//Draw the text.
	applyTexture(drawX, drawY, *cacheTex, renderer);
	}
	}
	}

	//////////////GUICheckBox///////////////////////////////////////////////////////////////////

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

	//The widget is only enabled when its parent are enabled.
	enabled=enabled && this->enabled;
	//The widget is only enabled when its parent are enabled.
	visible=visible && this->visible;

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

	//We don't update state under keyboard only mode.
	if (!isKeyboardOnly) {
	//Set state to 0.
	state = 0;

	//Only check for events when the object is both enabled and visible and the event hasn't been already processed.
	if (enabled && visible && !b) {
	//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 widget.
	if (i >= x && i < x + width && j >= y && j < y + height){
	//We have hover so set state to one.
	state = 1;
	//Check for a mouse button press.
	if (k&SDL_BUTTON(1))
	state = 2;

	//Check if there's a mouse press and the event hasn't been already processed.
	if (event.type == SDL_MOUSEBUTTONUP && event.button.button == SDL_BUTTON_LEFT){
	//It's a checkbox so toggle the value.
	value = value ? 0 : 1;

	//If event callback is configured then add an event to the queue.
	if (eventCallback){
	GUIEvent e = { eventCallback, name, this, GUIEventClick };
	GUIEventQueue.push_back(e);
	}
	}

	//Event has been processed as long as this is a mouse event and the mouse is inside the widget.
	if ((event.type == SDL_MOUSEMOTION && event.motion.state == 0)
	\|\| event.type == SDL_MOUSEBUTTONDOWN \|\| event.type == SDL_MOUSEBUTTONUP \|\| event.type == SDL_MOUSEWHEEL)
	{
	b = true;
	}
	}
	}
	}

	return b;
	}

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

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

	refreshCache(enabled);

	//Draw the highlight in keyboard only mode.
	if (isKeyboardOnly && state && draw) {
	drawGUIBox(x, y, width, height, renderer, 0xFFFFFF40);
	}

	//Get the text.
	const char* lp=caption.c_str();
	//Make sure it isn't empty.
	if(lp!=NULL && lp[0]){
	//Update the cache if needed.
	if(!cacheTex){
	SDL_Color color = objThemes.getTextColor(inDialog);

	cacheTex=textureFromText(renderer,*fontText,lp,color);
	}

	if(draw){
	//Calculate the location, center it vertically.
	const int drawX=x;
	const int drawY=y+(height - textureHeight(*cacheTex))/2;

	//Draw the text
	applyTexture(drawX, drawY, *cacheTex, renderer);
	}
	}

	if(draw){
	//Draw the check (or not).
	//value*16 determines where in the gui textures we draw from.
	//if(value==1\|\|value==2)
	// r1.x=value*16;
	const SDL_Rect srcRect={value*16,0,16,16};
	const SDL_Rect dstRect={x+width-20, y+(height-16)/2, 16, 16};
	//Get the right image depending on the state of the object.
	SDL_RenderCopy(&renderer, bmGuiTex.get(), &srcRect, &dstRect);
	}
	}

	//////////////GUILabel///////////////////////////////////////////////////////////////////

	bool GUILabel::handleEvents(SDL_Renderer&,int ,int ,bool ,bool ,bool processed){
	return processed;
	}

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

	//Check if the enabled state changed or the caption, if so we need to clear the (old) cache.
	refreshCache(enabled);

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

	//Rectangle the size of the widget.
	SDL_Rect r;
	r.x=x;
	r.y=y;
	r.w=width;
	r.h=height;

	//Get the caption and make sure it isn't empty.
	const char* lp=caption.c_str();
	if(lp!=NULL && lp[0]){
	//Update cache if needed.
	if(!cacheTex){
	SDL_Color color = objThemes.getTextColor(inDialog);

	cacheTex=textureFromText(renderer, *fontText, lp, color);
	if(width<=0)
	width=textureWidth(*cacheTex);
	}

	//Align the text properly and draw it.
	if(draw){
	const SDL_Rect size = rectFromTexture(*cacheTex);
	if(gravity==GUIGravityCenter)
	gravityX=(width-size.w)/2;
	else if(gravity==GUIGravityRight)
	gravityX=width-size.w;
	else
	gravityX=0;

	r.y=y+(height - size.h)/2;
	r.x+=gravityX;
	applyTexture(r.x, r.y, cacheTex, renderer);
	}
	}
	}

	//////////////GUITextBox///////////////////////////////////////////////////////////////////

	void GUITextBox::backspaceChar(){
	//We need to remove a character so first make sure that there is text.
	if(caption.length()>0){
	if(highlightStart==highlightEnd&&highlightStart>0){
	int advance = 0;

	// this is proper UTF-8 support
	int ch = utf8ReadBackward(caption.c_str(), highlightStart); // we obtain new highlightStart from this
	if (ch > 0) TTF_GlyphMetrics(fontText, ch, NULL, NULL, NULL, NULL, &advance);
	highlightEndX = highlightStartX = highlightEndX - advance;

	caption.erase(highlightStart, highlightEnd - highlightStart);
	highlightEnd = highlightStart;
	} else if (highlightStart<highlightEnd){
	caption.erase(highlightStart,highlightEnd-highlightStart);
	highlightEnd=highlightStart;
	highlightEndX=highlightStartX;
	}else{
	caption.erase(highlightEnd,highlightStart-highlightEnd);
	highlightStart=highlightEnd;
	highlightStartX=highlightEndX;
	}

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

	void GUITextBox::deleteChar(){
	//We need to remove a character so first make sure that there is text.
	if(caption.length()>0){
	if(highlightStart==highlightEnd){
	// this is proper utf8 support
	int i = highlightEnd;
	utf8ReadForward(caption.c_str(), i);
	if (i > highlightEnd) caption.erase(highlightEnd, i - highlightEnd);

	highlightStart=highlightEnd;
	highlightStartX=highlightEndX;
	}else if(highlightStart<highlightEnd){
	caption.erase(highlightStart,highlightEnd-highlightStart);

	highlightEnd=highlightStart;
	highlightEndX=highlightStartX;
	}else{
	caption.erase(highlightEnd,highlightStart-highlightEnd);

	highlightStart=highlightEnd;
	highlightStartX=highlightEndX;
	}

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

	void GUITextBox::moveCarrotLeft(){
	if(highlightEnd>0){
	int advance = 0;

	// this is proper UTF-8 support
	int ch = utf8ReadBackward(caption.c_str(), highlightEnd); // we obtain new highlightEnd from this
	if (ch > 0) TTF_GlyphMetrics(fontText, ch, NULL, NULL, NULL, NULL, &advance);

	if(SDL_GetModState() & KMOD_SHIFT){
	highlightEndX-=advance;
	}else{
	highlightStart=highlightEnd;
	highlightStartX=highlightEndX=highlightEndX-advance;
	}
	}else{
	if((SDL_GetModState() & KMOD_SHIFT)==0){
	highlightStart=highlightEnd;
	highlightStartX=highlightEndX;
	}
	}
	tick=15;
	}

	void GUITextBox::moveCarrotRight(){
	if(highlightEnd<caption.length()){
	int advance = 0;

	// this is proper UTF-8 support
	int ch = utf8ReadForward(caption.c_str(), highlightEnd); // we obtain new highlightEnd from this
	if (ch > 0) TTF_GlyphMetrics(fontText, ch, NULL, NULL, NULL, NULL, &advance);

	if(SDL_GetModState() & KMOD_SHIFT){
	highlightEndX+=advance;
	}else{
	highlightStartX=highlightEndX=highlightEndX+advance;
	highlightStart=highlightEnd;
	}
	}else{
	if((SDL_GetModState() & KMOD_SHIFT)==0){
	highlightStart=highlightEnd;
	highlightStartX=highlightEndX;
	}
	}
	tick=15;
	}

	void GUITextBox::updateText(const std::string& text) {
	caption = text;
	updateSelection(0, 0);
	}

	void GUITextBox::updateSelection(int start, int end) {
	start = clamp(start, 0, caption.size());
	end = clamp(end, 0, caption.size());

	highlightStart = start;
	highlightStartX = 0;
	highlightEnd = end;
	highlightEndX = 0;

	if (start > 0) {
	TTF_SizeUTF8(fontText, caption.substr(0, start).c_str(), &highlightStartX, NULL);
	}
	if (end > 0) {
	TTF_SizeUTF8(fontText, caption.substr(0, end).c_str(), &highlightEndX, NULL);
	}
	}

	void GUITextBox::inputText(const char* s) {
	int m = strlen(s);

	if (m > 0){
	if (highlightStart == highlightEnd) {
	caption.insert((size_t)highlightStart, s);
	highlightStart += m;
	highlightEnd = highlightStart;
	} else if (highlightStart < highlightEnd) {
	caption.erase(highlightStart, highlightEnd - highlightStart);
	caption.insert((size_t)highlightStart, s);
	highlightStart += m;
	highlightEnd = highlightStart;
	highlightEndX = highlightStartX;
	} else {
	caption.erase(highlightEnd, highlightStart - highlightEnd);
	caption.insert((size_t)highlightEnd, s);
	highlightEnd += m;
	highlightStart = highlightEnd;
	highlightStartX = highlightEndX;
	}
	int advance = 0;
	for (int i = 0;;) {
	int a = 0;
	int ch = utf8ReadForward(s, i);
	if (ch <= 0) break;
	TTF_GlyphMetrics(fontText, ch, NULL, NULL, NULL, NULL, &a);
	advance += a;
	}
	highlightStartX = highlightEndX = highlightStartX + advance;

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

	void GUITextBox::blur(){
	state = 0;
	highlightStart=highlightStartX=0;
	highlightEnd=highlightEndX=0;
	}

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

	//The widget is only enabled when its parent are enabled.
	enabled=enabled && this->enabled;
	//The widget is only enabled when its parent are enabled.
	visible=visible && this->visible;

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

	//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){
	//Get the keycode.
	SDL_Keycode key=event.key.keysym.sym;

	if ((event.key.keysym.mod & KMOD_CTRL) == 0) {
	//Check if the key is supported.
	if (event.key.keysym.sym == SDLK_BACKSPACE){
	backspaceChar();
	} else if (event.key.keysym.sym == SDLK_DELETE){
	deleteChar();
	} else if (event.key.keysym.sym == SDLK_RIGHT){
	moveCarrotRight();
	} else if (event.key.keysym.sym == SDLK_LEFT){
	moveCarrotLeft();
	}
	} else {
	//Check hotkey.
	if (event.key.keysym.sym == SDLK_a) {
	//Select all.
	highlightStart = 0;
	highlightStartX = 0;
	highlightEnd = caption.size();
	highlightEndX = 0;
	if (highlightEnd > 0) {
	TTF_SizeUTF8(fontText, caption.c_str(), &highlightEndX, NULL);
	}
	} else if (event.key.keysym.sym == SDLK_x \|\| event.key.keysym.sym == SDLK_c) {
	//Cut or copy.
	int start = highlightStart, end = highlightEnd;
	if (start > end) std::swap(start, end);
	if (start < end) {
	SDL_SetClipboardText(caption.substr(start, end - start).c_str());
	if (event.key.keysym.sym == SDLK_x) {
	//Cut.
	backspaceChar();
	}
	}
	} else if (event.key.keysym.sym == SDLK_v) {
	//Paste.
	if (SDL_HasClipboardText()) {
	char *s = SDL_GetClipboardText();
	inputText(s);
	SDL_free(s);
	}
	}
	}

	//The event has been processed.
	b = true;
	} else if (state == 2 && event.type == SDL_TEXTINPUT && !b){
	inputText(event.text.text);

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

	//Only process mouse event when not in keyboard only mode
	if (!isKeyboardOnly &&
	(event.type == SDL_MOUSEMOTION \|\| event.type == SDL_MOUSEBUTTONDOWN \|\| event.type == SDL_MOUSEBUTTONUP \|\| event.type == SDL_MOUSEWHEEL))
	{
	//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 widget and the event hasn't been processed.
	if (i >= x && i < x + width && j >= y && j < y + height && !b) {
	//We can only increase our state. (nothing->hover->focus).
	if (state != 2){
	state = 1;
	}

	//Also update the cursor type.
	currentCursor = CURSOR_CARROT;

	//Move carrot and highlightning according to mouse input.
	int clickX = i - x - 2;

	int finalPos = 0;
	int finalX = 0;

	if (cacheTex&&!caption.empty()){
	finalPos = caption.length();
	for (int i = 0;;){
	int advance = 0;

	// this is proper UTF-8 support
	int i0 = i;
	int ch = utf8ReadForward(caption.c_str(), i);
	if (ch <= 0) break;
	TTF_GlyphMetrics(fontText, 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){
	state = 2;
	highlightEnd = finalPos;
	highlightEndX = finalX;
	} else if (event.type == SDL_MOUSEBUTTONDOWN){
	state = 2;
	highlightStart = highlightEnd = finalPos;
	highlightStartX = highlightEndX = finalX;
	} else if (event.type == SDL_MOUSEMOTION && (k&SDL_BUTTON(1)) && state == 2){
	state = 2;
	highlightEnd = finalPos;
	highlightEndX = finalX;
	}

	//Event has been processed as long as this is a mouse event and the mouse is inside the widget.
	b = true;
	} 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_MOUSEBUTTONDOWN && event.button.button == SDL_BUTTON_LEFT){
	blur();
	}
	}
	}
	}

	return b;
	}

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

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

	//Check if the enabled state changed or the caption, if so we need to clear the (old) cache.
	refreshCache(enabled);

	if(draw){
	//Default background opacity
	int clr=50;
	//If hovering or focused make background more visible.
	if(state==1)
	clr=128;
	else if (state==2)
	clr=100;

	//Draw the box.
	Uint32 color=0xFFFFFF00\|clr;
	drawGUIBox(x,y,width,height,renderer,color);
	}

	//Rectangle used for drawing.
	SDL_Rect r{0,0,0,0};

	//Get the text and make sure it isn't empty.
	const char* lp=caption.c_str();
	if(lp!=NULL && lp[0]){
	if(!cacheTex) {
	//Draw the text.
	cacheTex=textureFromText(renderer,*fontText,lp,objThemes.getTextColor(true));
	}

	if(draw){
	//Only draw the carrot and highlight when focus.
	if(state==2){
	//Place the highlighted area.
	r.x=x+4;
	r.y=y+3;
	r.h=height-6;

	if(highlightStart<highlightEnd){
	r.x+=highlightStartX;
	r.w=highlightEndX-highlightStartX;
	}else{
	r.x+=highlightEndX;
	r.w=highlightStartX-highlightEndX;
	}

	//Draw the area.
	//SDL_FillRect(screen,&r,SDL_MapRGB(screen->format,128,128,128));
	SDL_SetRenderDrawColor(&renderer, 128,128,128,255);
	SDL_RenderFillRect(&renderer, &r);

	//Ticking carrot.
	if(tick<16){
	//Show carrot: 15->0.
	r.x=x+highlightEndX+2;
	r.y=y+3;
	r.h=height-6;
	r.w=2;
	//SDL_FillRect(screen,&r,SDL_MapRGB(screen->format,0,0,0));
	SDL_SetRenderDrawColor(&renderer,0,0,0,255);
	SDL_RenderFillRect(&renderer, &r);

	//Reset: 32 or count down.
	if(tick<=0)
	tick=32;
	else
	tick--;
	}else{
	//Hide carrot: 32->16.
	tick--;
	}
	}

	//Calculate the location, center it vertically.
	SDL_Rect dstRect=rectFromTexture(*cacheTex);
	dstRect.x=x+4;
	dstRect.y=y+(height-dstRect.h)/2;
	dstRect.w=std::min(width-2, dstRect.w);
	//Draw the text.
	const SDL_Rect srcRect={0,0,width-2,25};
	SDL_RenderCopy(&renderer, cacheTex.get(), &srcRect, &dstRect);
	}
	}else{
	//Only draw the carrot when focus.
	if(state==2&&draw){
	//Ticking carrot.
	if (tick<16){
	//Show carrot: 15->0.
	r.x = x + 4;
	r.y = y + 4;
	r.w = 2;
	r.h = height - 8;
	//SDL_FillRect(screen,&r,SDL_MapRGB(screen->format,0,0,0));
	SDL_SetRenderDrawColor(&renderer, 0, 0, 0, 255);
	SDL_RenderFillRect(&renderer, &r);

	//Reset: 32 or count down.
	if (tick <= 0)
	tick = 32;
	else
	tick--;
	} else{
	//Hide carrot: 32->16.
	tick--;
	}
	}
	}
	}

	//////////////GUIFrame///////////////////////////////////////////////////////////////////

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

	//The widget is only enabled when its parent are enabled.
	enabled=enabled && this->enabled;
	//The widget is only enabled when its parent are enabled.
	visible=visible && this->visible;

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

	//Also let the children handle their events.
	for (int i = childControls.size() - 1; i >= 0; 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;
	}

	//If we are visible, the event is a mouse event, and the mouse is inside the widget, we mark this event as processed.
	if (visible &&
	((event.type == SDL_MOUSEMOTION && event.motion.state == 0)
	\|\| event.type == SDL_MOUSEBUTTONDOWN \|\| event.type == SDL_MOUSEBUTTONUP \|\| event.type == SDL_MOUSEWHEEL))
	{
	//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 widget.
	if (i >= x && i < x + width && j >= y && j < y + height) {
	b = true;
	}
	}

	return b;
	}

	void GUIFrame::render(SDL_Renderer& renderer, int x,int y,bool draw){
	//There's no need drawing this widget when it's invisible.
	if(!visible)
	return;

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

	//Check if the enabled state changed or the caption, if so we need to clear the (old) cache.
	if(enabled!=cachedEnabled \|\| caption.compare(cachedCaption)!=0 \|\| width<=0){
	//Free the cache.
	cacheTex.reset(nullptr);

	//And cache the new values.
	cachedEnabled=enabled;
	cachedCaption=caption;

	//Finally resize the widget.
	if(autoWidth)
	width=-1;
	}

	//Draw fill and borders.
	if(draw){
	Uint32 color=0xDDDDDDFF;
	drawGUIBox(x,y,width,height,renderer,color);
	}

	//Get the title text and make sure it isn't empty.
	const char* lp=caption.c_str();
	if(lp!=NULL && lp[0]){
	//Update cache if needed.
	if(!cacheTex) {
	cacheTex = textureFromText(renderer, *fontGUI, lp, objThemes.getTextColor(true));
	}
	//Draw the text.
	if(draw) {
	applyTexture(x+(width-textureWidth(cacheTex))/2, y+6-GUI_FONT_RAISE, cacheTex, renderer);
	}
	}
	//We now need to draw all the children.
	for(unsigned int i=0;i<childControls.size();i++){
	childControls[i]->render(renderer,x,y,draw);
	}
	}

	//////////////GUIImage///////////////////////////////////////////////////////////////////

	GUIImage::~GUIImage(){
	}

	bool GUIImage::handleEvents(SDL_Renderer&,int ,int ,bool ,bool ,bool processed){
	return processed;
	}

	void GUIImage::fitToImage(){
	const SDL_Rect imageSize = rectFromTexture(*image);

	//Increase or decrease the width and height to fully show the image.
	if(clip.w!=0) {
	width=clip.w;
	} else {
	width=imageSize.w;
	}
	if(clip.h!=0) {
	height=clip.h;
	} else {
	height=imageSize.h;
	}
	}

	void GUIImage::render(SDL_Renderer& renderer, int x,int y,bool draw){
	//There's no need drawing the widget when it's invisible.
	//Also make sure the image isn't null.
	if(!visible \|\| !image \|\| !draw)
	return;

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

	//Create a clip rectangle.
	SDL_Rect r=clip;
	//The width and height are capped by the GUIImage itself.
	if(r.w>width \|\| r.w==0) {
	r.w=width;
	}
	if(r.h>height \|\| r.h==0) {
	r.h=height;
	}

	const SDL_Rect dstRect={x,y,r.w,r.h};
	SDL_RenderCopy(&renderer, image.get(), &r, &dstRect);
	}

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