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 "GUIObject.h"
	#include <iostream>
	#include <list>
	using namespace std;

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


	void GUIObjectHandleEvents(bool kill){
	//Check if user resizes the window.
	if(event.type==SDL_VIDEORESIZE){
	//onVideoResize();

	//Don't let other objects process this event (?)
	return;
	}

	//Make sure that GUIObjectRoot isn't null.
	if(GUIObjectRoot)
	GUIObjectRoot->handleEvents();

	//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(e.name,e.obj,e.eventType);
	}
	}
	//We empty the event queue just to be sure.
	GUIEventQueue.clear();
	}

	GUIObject::~GUIObject(){
	if(cache){
	SDL_FreeSurface(cache);
	cache=NULL;
	}
	//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 GUIObject::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-gravityX;
	y+=top;

	//Type specific event handling.
	switch(type){
	case GUIObjectButton:
	//Set state to 0.
	state=0;

	//Only check for events when the object is both enabled and visible.
	if(enabled&&visible){
	//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 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 && !b){
	//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.
	b=true;
	}
	}
	}
	break;
	case GUIObjectCheckBox:
	//Set state to 0.
	state=0;

	//Only check for events when the object is both enabled and visible.
	if(enabled&&visible){
	//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 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 && !b){
	//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.
	b=true;
	}
	}
	}
	break;
	case GUIObjectTextBox:
	//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.
	int key=(int)event.key.keysym.unicode;

	//Check if the key is supported.
	if(key>=32&&key<=126){
	//Add the key to the text after the carrot.
	caption.insert((size_t)value,1,char(key));
	value=clamp(value+1,0,caption.length());

	//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_BACKSPACE){
	//We need to remove a character so first make sure that there is text.
	if(caption.length()>0&&value>0){
	//Remove the character before the carrot.
	value=clamp(value-1,0,caption.length());
	caption.erase((size_t)value,1);

	//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_DELETE){
	//We need to remove a character so first make sure that there is text.
	if(caption.length()>0){
	//Remove the character after the carrot.
	value=clamp(value,0,caption.length());
	caption.erase((size_t)value,1);

	//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_RIGHT){
	value=clamp(value+1,0,caption.length());
	}else if(event.key.keysym.sym==SDLK_LEFT){
	value=clamp(value-1,0,caption.length());
	}

	//The event has been processed.
	b=true;
	}

	//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;
	}

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

	//Check for a mouse button press.
	if(k&SDL_BUTTON(1)){
	//We have focus.
	state=2;

	//Move carrot to the place clicked
	int click=i-left;
	int wid=0;

	if(!cache){
	value=0;
	}else if(click>cache->w){
	value=caption.length();
	}else{
	for(int i=0;i<caption.length();i++){
	int advance;
	TTF_GlyphMetrics(fontText,caption[i],NULL,NULL,NULL,NULL,&advance);
	wid+=advance;

	if(click<wid-advance/2){
	value=i;
	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;
	}
	}
	}
	break;
	}

	//Also let the children handle their events.
	for(unsigned int i=0;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;
	}

	//Found on gmane.comp.lib.sdl mailing list, see: http://comments.gmane.org/gmane.comp.lib.sdl/33664
	//Original code by "Patricia Curtis" and later modified by "Jason"
	static void SetSurfaceTrans(SDL_Surface* Src,double PercentTrans){
	Uint8 Sbpp = Src->format->BytesPerPixel;
	Uint8 *Sbits;

	#if SDL_BYTEORDER == SDL_BIG_ENDIAN
	int amask = 0x000000ff;
	int cmask = 0xffffff00;
	#else
	int amask = 0xff000000;
	int cmask = 0x00ffffff;
	int Shift = 24;
	#endif

	int x,y;
	Uint32 Pixels;
	Uint32 Alpha;

	for(y=0;y<Src->h;y++)
	{
	for(x=0;x<Src->w;x++)
	{
	Sbits = ((Uint8 )Src->pixels+(ySrc->pitch)+(x*Sbpp));
	Pixels = ((Uint32 )(Sbits));
	#if SDL_BYTEORDER == SDL_BIG_ENDIAN
	Alpha = Pixels & mask;
	#else
	Alpha = (Pixels&amask)>>Shift;
	#endif
	Alpha*=PercentTrans;

	#if SDL_BYTEORDER == SDL_BIG_ENDIAN
	((Uint32 )(Sbits)) = (Pixels & cmask)\|Alpha;
	#else
	((Uint32 )(Sbits)) = (Pixels & cmask)\|(Alpha<<Shift);
	#endif
	}
	}
	}

	void GUIObject::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;

	//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.
	SDL_FreeSurface(cache);
	cache=NULL;

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

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


	//Now do the type specific rendering.
	switch(type){
	case GUIObjectLabel:
	{
	//The rectangle is simple.
	r.x=x;
	r.y=y;
	r.w=width;
	r.h=height;

	//We don't draw a background and/or border since that label is transparent.
	//Get the caption and make sure it isn't empty.
	const char* lp=caption.c_str();
	if(lp!=NULL && lp[0]){
	//Render the text using the small font.
	if(cache==NULL){
	SDL_Color color;
	if(inDialog)
	color=themeTextColorDialog;
	else
	color=themeTextColor;

	cache=TTF_RenderUTF8_Blended(fontText,lp,color);

	if(width<=0)
	width=cache->w;
	}

	if(draw){
	if(gravity==GUIGravityCenter)
	gravityX=(width-cache->w)/2;
	else if(gravity==GUIGravityRight)
	gravityX=width+cache->w;
	else
	gravityX=0;

	//Center the text vertically and draw it to the screen.
	r.y=y+(height - cache->h)/2;
	r.x+=gravityX;
	SDL_BlitSurface(cache,NULL,screen,&r);
	}
	}
	}
	break;
	case GUIObjectCheckBox:
	{
	//The rectangle is simple.
	r.x=x;
	r.y=y;
	r.w=width;
	r.h=height;

	//Get the text.
	const char* lp=caption.c_str();
	//Make sure it isn't empty.
	if(lp!=NULL && lp[0]){
	//We render black text.
	if(!cache){
	SDL_Color color;
	if(inDialog)
	color=themeTextColorDialog;
	else
	color=themeTextColor;

	cache=TTF_RenderUTF8_Blended(fontText,lp,color);
	}

	if(draw){
	//Calculate the location, center it vertically.
	r.x=x;
	r.y=y+(height - cache->h)/2;

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

	if(draw){
	//Draw the check (or not).
	SDL_Rect r1={0,0,16,16};
	if(value==1\|\|value==2)
	r1.x=value*16;
	r.x=x+width-20;
	r.y=y+(height-16)/2;
	SDL_BlitSurface(bmGUI,&r1,screen,&r);
	}
	}
	break;
	case GUIObjectButton:
	{
	//Get the text.
	const char* lp=caption.c_str();
	//Make sure the text isn't empty.
	if(lp!=NULL && lp[0]){
	if(!cache){
	SDL_Color color;
	if(inDialog)
	color=themeTextColorDialog;
	else
	color=themeTextColor;

	if(!smallFont)
	cache=TTF_RenderUTF8_Blended(fontGUI,lp,color);
	else
	cache=TTF_RenderUTF8_Blended(fontGUISmall,lp,color);

	if(!enabled)
	SetSurfaceTrans(cache,0.5);

	if(width<=0){
	width=cache->w+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.
	r.x=x-gravityX+(width-cache->w)/2;
	r.y=y+(height-cache->h)/2-GUI_FONT_RAISE;

	//Check if the arrows don't fall of.
	if(cache->w+32<=width){
	//Create a rectangle that selects the right image from bmGUI,
	SDL_Rect r2={64,0,16,16};
	if(state==1){
	if(inDialog){
	applySurface(x-gravityX+(width-cache->w)/2+4+cache->w+5,y+2,arrowLeft2,screen,NULL);
	applySurface(x-gravityX+(width-cache->w)/2-25,y+2,arrowRight2,screen,NULL);
	}else{
	applySurface(x-gravityX+(width-cache->w)/2+4+cache->w+5,y+2,arrowLeft1,screen,NULL);
	applySurface(x-gravityX+(width-cache->w)/2-25,y+2,arrowRight1,screen,NULL);
	}
	}else if(state==2){
	if(inDialog){
	applySurface(x-gravityX+(width-cache->w)/2+4+cache->w,y+2,arrowLeft2,screen,NULL);
	applySurface(x-gravityX+(width-cache->w)/2-20,y+2,arrowRight2,screen,NULL);
	}else{
	applySurface(x-gravityX+(width-cache->w)/2+4+cache->w,y+2,arrowLeft1,screen,NULL);
	applySurface(x-gravityX+(width-cache->w)/2-20,y+2,arrowRight1,screen,NULL);
	}
	}
	}

	//Draw the text and free the surface.
	SDL_BlitSurface(cache,NULL,screen,&r);
	}
	}
	}
	break;
	case GUIObjectTextBox:
	{
	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,screen,color);
	}

	//Get the text.
	const char* lp=caption.c_str();
	//Make sure it isn't empty.
	if(lp!=NULL && lp[0]){
	if(!cache){
	//Draw the black text.
	SDL_Color black={0,0,0,0};
	cache=TTF_RenderUTF8_Blended(fontText,lp,black);
	}

	if(draw){
	//Calculate the location, center it vertically.
	r.x=x+2;
	r.y=y+(height - cache->h)/2;

	//Draw the text.
	SDL_Rect tmp={0,0,width-2,25};
	SDL_BlitSurface(cache,&tmp,screen,&r);
	//Only draw the carrot when focus.
	if(state==2){
	r.x=x;
	r.y=y+4;
	r.w=2;
	r.h=height-8;

	int advance;
	for(int n=0;n<value;n++){
	TTF_GlyphMetrics(fontText,caption[n],NULL,NULL,NULL,NULL,&advance);
	r.x+=advance;
	}

	//Make sure that the carrot is inside the textbox.
	if(r.x<x+width)
	SDL_FillRect(screen,&r,0);
	}
	}
	}else{
	//Only draw the carrot when focus.
	if(state==2&&draw){
	r.x=x+4;
	r.y=y+4;
	r.w=2;
	r.h=height-8;
	SDL_FillRect(screen,&r,0);
	}
	}
	}
	break;
	case GUIObjectFrame:
	{
	if(draw){
	//Create a rectangle the size of the button and fill it.
	Uint32 color=0xDDDDDDFF;
	drawGUIBox(x,y,width,height,screen,color);
	}

	//Get the title text.
	const char* lp=caption.c_str();
	//Make sure it isn't empty.
	if(lp!=NULL && lp[0]){
	if(!cache){
	cache=TTF_RenderUTF8_Blended(fontGUI,lp,themeTextColorDialog);
	}

	if(draw){
	//Calculate the location, center horizontally and vertically relative to the top.
	r.x=x+(width-cache->w)/2;
	r.y=y+6-GUI_FONT_RAISE;

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

	//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);
	}
	}

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