GUIListBox.cpp
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GUIListBox.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 "GUIListBox.h"
	using namespace std;

	GUIListBox::GUIListBox(int left,int top,int width,int height,bool enabled,bool visible,int gravity):
	GUIObject(left,top,width,height,NULL,-1,enabled,visible,gravity),selectable(true),clickEvents(false){
	//Set the state -1.
	state=-1;

	//Create the scrollbar and add it to the children.
	scrollBar=new GUIScrollBar(width-16,0,16,height,1,0,0,0,1,1,true,true);
	childControls.push_back(scrollBar);
	}

	GUIListBox::~GUIListBox(){
	//Remove all items and cache.
	clearItems();
	//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();
	}

	bool GUIListBox::handleEvents(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 scrollbar.
	if(scrollBar->visible)
	b=b\|\|scrollBar->handleEvents(x,y,enabled,visible,b);

	//Set state negative.
	state=-1;

	//Check if the GUIListBox is visible, enabled and no event has been processed before.
	if(enabled&&visible&&!b){
	//The mouse location (x=i, y=j) and the mouse button (k).
	int i,j;
	SDL_GetMouseState(&i,&j);

	//Convert the mouse location to a relative location.
	i-=x;
	j-=y;

	//Check if the mouse is inside the GUIListBox.
	if(i>=0&&i<width-4&&j>=0&&j<height-4){
	//Calculate selected item.
	int idx=-1;
	int yPos=-firstItemY;
	int i=scrollBar->value;
	if(yPos!=0) i--;
	for(;i<images.size();++i){
	SDL_Surface** c=&images.at(i);
	if(c) yPos+=(c)->h;
	if(j<yPos){
	idx=i;
	break;
	}
	}

	//If the entry isn't above the max we have an event.
	if(idx>=0&&idx<(int)item.size()&&selectable){
	state=idx;

	//Check if the left mouse button is pressed.
	if(event.type==SDL_MOUSEBUTTONDOWN && event.button.button==SDL_BUTTON_LEFT){
	//Check if the slected item changed.
	if(value!=idx){
	value=idx;

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

	//After possibly a change event, there will always be a click event.
	if(eventCallback && clickEvents){
	GUIEvent e={eventCallback,name,this,GUIEventClick};
	GUIEventQueue.push_back(e);
	}
	}
	}

	//Check for mouse wheel scrolling.
	if(event.type==SDL_MOUSEBUTTONDOWN && event.button.button==SDL_BUTTON_WHEELDOWN && scrollBar->enabled){
	scrollBar->value++;
	if(scrollBar->value>scrollBar->maxValue)
	scrollBar->value=scrollBar->maxValue;
	}else if(event.type==SDL_MOUSEBUTTONDOWN && event.button.button==SDL_BUTTON_WHEELUP && scrollBar->enabled){
	scrollBar->value--;
	if(scrollBar->value<0)
	scrollBar->value=0;
	}
	}
	}

	//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(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 GUIListBox::render(int x,int y,bool draw){
	if(updateScrollbar){
	//Calculate the height of the content.
	int maxY=0;
	for(unsigned int i=0;i<images.size();i++){
	maxY+=images.at(i)->h;
	}

	//Check if we need to show the scrollbar for many entries.
	if(maxY<height){
	scrollBar->maxValue=0;
	scrollBar->value=0;
	scrollBar->visible=false;
	}else{
	scrollBar->visible=true;
	scrollBar->maxValue=item.size();
	int yy=0;
	for(int i=images.size()-1;i>0;i--){
	yy+=images.at(i)->h;
	if(yy>height)
	break;
	else
	scrollBar->maxValue--;
	}
	scrollBar->largeChange=item.size()/4;
	}
	updateScrollbar=false;
	}

	//Rectangle the size of the GUIObject, used to draw borders.
	//SDL_Rect r; //Unused local variable :/
	//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 background box.
	SDL_Rect r={x,y,width,height};
	SDL_FillRect(screen,&r,0xFFFFFFFF);

	firstItemY=0;

	//Loop through the entries and draw them.
	if(scrollBar->value==scrollBar->maxValue&&scrollBar->visible){
	int lowNumber=height;
	int currentItem=images.size()-1;
	while(lowNumber>=0&&currentItem>=0){
	lowNumber-=images.at(currentItem)->h;

	if(lowNumber>0){
	if(selectable){
	//Check if the mouse is hovering on current entry. If so draw borders around it.
	if(state==currentItem)
	drawGUIBox(x,y+lowNumber-1,width,images.at(currentItem)->h+1,screen,0x00000000);

	//Check if the current entry is selected. If so draw a gray background.
	if(value==currentItem)
	drawGUIBox(x,y+lowNumber-1,width,images.at(currentItem)->h+1,screen,0xDDDDDDFF);
	}

	applySurface(x,y+lowNumber,images.at(currentItem),screen,NULL);
	}else{
	if(selectable){
	//Check if the mouse is hovering on current entry. If so draw borders around it.
	if(state==currentItem)
	drawGUIBox(x,y,width,images.at(currentItem)->h+lowNumber+1,screen,0x00000000);

	//Check if the current entry is selected. If so draw a gray background.
	if(value==currentItem)
	drawGUIBox(x,y,width,images.at(currentItem)->h+lowNumber+1,screen,0xDDDDDDFF);
	}

	firstItemY=-lowNumber;

	SDL_Rect clip;
	clip.x=0;
	clip.y=-lowNumber;
	clip.w=images.at(currentItem)->w;
	clip.h=images.at(currentItem)->h+lowNumber;
	applySurface(x,y,images.at(currentItem),screen,&clip);
	break;
	}

	currentItem--;
	}
	}else{
	for(int i=scrollBar->value,j=y+1;j<=height&&i<(int)item.size();i++){
	//Check if the current item is out side of the widget.
	int yOver=images[i]->h;
	if(j+images[i]->h>y+height)
	yOver=y+height-j;

	if(yOver>0){
	if(selectable){
	//Check if the mouse is hovering on current entry. If so draw borders around it.
	if(state==i)
	drawGUIBox(x,j-1,width,yOver+1,screen,0x00000000);

	//Check if the current entry is selected. If so draw a gray background.
	if(value==i)
	drawGUIBox(x,j-1,width,yOver+1,screen,0xDDDDDDFF);
	}

	//Draw the image.
	SDL_Rect clip;
	clip.x=0;
	clip.y=0;
	clip.w=images[i]->w;
	clip.h=yOver;
	applySurface(x,j,images[i],screen,&clip);
	}else{
	break;
	}
	j+=images[i]->h;
	}
	}

	//Draw borders around the whole thing.
	drawGUIBox(x,y,width,height,screen,0x00000000);

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

	void GUIListBox::clearItems(){
	item.clear();
	for(unsigned int i=0;i<images.size();i++){
	SDL_FreeSurface(images[i]);
	}
	images.clear();
	}

	void GUIListBox::addItem(std::string name, SDL_Surface* image){
	item.push_back(name);

	if(image){
	images.push_back(image);
	}else if(!image&&!name.empty()){
	SDL_Color black={0,0,0,0};
	SDL_Surface* tmp=TTF_RenderUTF8_Blended(fontText,name.c_str(),black);
	images.push_back(tmp);
	}

	updateScrollbar=true;
	}

	void GUIListBox::updateItem(int index, std::string newText, SDL_Surface* newImage){
	item.at(index)=newText;

	if(newImage){
	SDL_FreeSurface(images.at(index));
	images.at(index)=newImage;
	}else if(!newImage&&!newText.empty()){
	SDL_FreeSurface(images.at(index));
	SDL_Color black={0,0,0,0};
	SDL_Surface* tmp=TTF_RenderUTF8_Blended(fontText,newText.c_str(),black);
	images.at(index)=tmp;
	}

	updateScrollbar=true;
	}

	std::string GUIListBox::getItem(int index){
	return item.at(index);
	}

	GUISingleLineListBox::GUISingleLineListBox(int left,int top,int width,int height,bool enabled,bool visible,int gravity):
	GUIObject(left,top,width,height,NULL,-1,enabled,visible,gravity),animation(0){}

	void GUISingleLineListBox::addItem(string name,string label){
	//Check if the label is set, if not use the name.
	if(label.size()==0)
	label=name;

	item.push_back(pair<string,string>(name,label));
	}

	void GUISingleLineListBox::addItems(vector<pair<string,string> > items){
	vector<pair<string,string> >::iterator it;
	for(it=items.begin();it!=items.end();++it){
	addItem(it->first,it->second);
	}
	}

	void GUISingleLineListBox::addItems(vector<string> items){
	vector<string>::iterator it;
	for(it=items.begin();it!=items.end();++it){
	addItem(*it);
	}
	}

	string GUISingleLineListBox::getName(unsigned int index){
	if(index==(unsigned int)-1)
	index=value;
	if(index>item.size())
	return "";

	return item[index].first;
	}

	bool GUISingleLineListBox::handleEvents(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(s) are enabled.
	enabled=enabled && this->enabled;
	//The GUIObject is only enabled when he and his parent(s) are enabled.
	visible=visible && this->visible;

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

	state&=~0xF;
	if(enabled&&visible){
	//The mouse location (x=i, y=j) and the mouse button (k).
	int i,j,k;
	k=SDL_GetMouseState(&i,&j);

	//Convert the mouse location to a relative location.
	i-=x;
	j-=y;

	//The selected button.
	//0=nothing 1=left 2=right.
	int idx=0;

	//Check which button the mouse is above.
	if(i>=0&&i<width&&j>=0&&j<height){
	if(i<26 && i<width/2){
	//The left arrow.
	idx=1;
	}else if(i>=width-26){
	//The right arrow.
	idx=2;
	}
	}

	//If idx is 0 it means the mous doesn't hover any arrow so reset animation.
	if(idx==0)
	animation=0;

	//Check if there's a mouse button press or not.
	if(k&SDL_BUTTON(1)){
	if(((state>>4)&0xF)==idx)
	state\|=idx;
	}else{
	state\|=idx;
	}

	//Check if there's a mouse press.
	if(event.type==SDL_MOUSEBUTTONDOWN && event.button.button==SDL_BUTTON_LEFT && idx){
	state=idx\|(idx<<4);
	}else if(event.type==SDL_MOUSEBUTTONUP && event.button.button==SDL_BUTTON_LEFT && idx && ((state>>4)&0xF)==idx){
	int m=(int)item.size();
	if(m>0){
	if(idx==2){
	idx=value+1;
	if(idx<0\|\|idx>=m) idx=0;
	if(idx!=value){
	value=idx;

	//If there is an event callback then call it.
	if(eventCallback){
	GUIEvent e={eventCallback,name,this,GUIEventClick};
	GUIEventQueue.push_back(e);
	}
	}
	}else if(idx==1){
	idx=value-1;
	if(idx<0\|\|idx>=m) idx=m-1;
	if(idx!=value){
	value=idx;

	//If there is an event callback then call it.
	if(eventCallback){
	GUIEvent e={eventCallback,name,this,GUIEventClick};
	GUIEventQueue.push_back(e);
	}
	}
	}
	}
	}
	if(event.type==SDL_MOUSEBUTTONUP) state&=0xF;
	}else{
	//Set state zero.
	state=0;
	}

	return b;
	}

	void GUISingleLineListBox::render(int x,int y,bool draw){
	//Rectangle the size of the GUIObject, used to draw borders.
	SDL_Rect r;

	//There's no need drawing the GUIObject when it's invisible.
	if(!visible)
	return;

	//NOTE: logic in the render method since it's the only part that gets called every frame.
	if((state&0xF)==0x1 \|\| (state&0xF)==0x2){
	animation++;
	if(animation>20)
	animation=-20;
	}

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

	if(gravity==GUIGravityCenter)
	gravityX=int(width/2);
	else if(gravity==GUIGravityRight)
	gravityX=width;

	x-=gravityX;

	//Check if the enabled state changed or the caption, if so we need to clear the (old) cache.
	if(enabled!=cachedEnabled \|\| item[value].second.compare(cachedCaption)!=0){
	//Free the cache.
	SDL_FreeSurface(cache);
	cache=NULL;

	//And cache the new values.
	cachedEnabled=enabled;
	cachedCaption=item[value].second;
	}

	//Draw the text.
	if(value>=0 && value<(int)item.size()){
	//Get the text.
	const char* lp=item[value].second.c_str();

	//Check if the text is empty or not.
	if(lp!=NULL && lp[0]){
	if(!cache){
	SDL_Color color;
	if(inDialog)
	color=themeTextColorDialog;
	else
	color=themeTextColor;

	cache=TTF_RenderUTF8_Blended(fontGUI,lp,color);

	//If the text is too wide then we change to smaller font (?)
	//NOTE: The width is 32px smaller (2x16px for the arrows).
	if(cache->w>width-32){
	SDL_FreeSurface(cache);
	cache=TTF_RenderUTF8_Blended(fontGUISmall,lp,color);
	}
	}

	if(draw){
	//Center the text both vertically as horizontally.
	r.x=x+(width-cache->w)/2;
	r.y=y+(height-cache->h)/2-GUI_FONT_RAISE;

	//Draw the text and free the surface afterwards.
	SDL_BlitSurface(cache,NULL,screen,&r);
	}
	}
	}

	if(draw){
	//Draw the arrows.
	SDL_Rect r2={48,0,16,16};
	r.x=x;
	if((state&0xF)==0x1)
	r.x+=abs(animation/2);
	r.y=y+4;
	if(inDialog)
	applySurface(r.x,r.y,arrowLeft2,screen,NULL);
	else
	applySurface(r.x,r.y,arrowLeft1,screen,NULL);

	r.x=x+width-16;
	if((state&0xF)==0x2)
	r.x-=abs(animation/2);
	if(inDialog)
	applySurface(r.x,r.y,arrowRight2,screen,NULL);
	else
	applySurface(r.x,r.y,arrowRight1,screen,NULL);
	}
	}

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