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GUISlider.cpp
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GUISlider.cpp
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/*
* Copyright (C) 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 "GUISlider.h"
using namespace std;
void GUISlider::calcPos(){
//Floats ...
float f,f2;
//The value can't be below the minimum value or above the maximum.
if(value<minValue)
value=minValue;
else if(value>maxValue)
value=maxValue;
//
f=(float)(left+1);
f2=(float)(width-2);
if(largeChange<=0) f2=-1;
if(f2>0){
float f1=0.0f;
valuePerPixel = (maxValue - minValue + largeChange) / f2;
if(valuePerPixel > 0.0001f) f1 = largeChange / valuePerPixel;
if(f1 < 4 && f2 > 4){
valuePerPixel = (maxValue - minValue) / (f2 - 4);
f1 = 4;
}
thumbStart = f + (value - minValue) / valuePerPixel;
thumbEnd = thumbStart + f1;
}else{
valuePerPixel = -1;
thumbStart = f;
thumbEnd = f - 1;
}
}
bool GUISlider::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;
//Check if the mouse button is released.
if(event.type==SDL_MOUSEBUTTONUP || !(enabled&&visible)){
//It so we have lost any focus at all.
state=0;
}else if(event.type==SDL_MOUSEMOTION || event.type==SDL_MOUSEBUTTONDOWN){
//The mouse button is down and it's moving
int i,j,k,f,f1;
state&=~0xFF;
k=SDL_GetMouseState(&i,&j);
i-=x;
j-=y;
bool bInControl_0;
f=left;
f1=f+width;
bInControl_0=(j>=top&&j<top+height);
//===
if((state&0x0000FF00)==0x300&&(k&SDL_BUTTON(1))&&event.type==SDL_MOUSEMOTION&&valuePerPixel>0){
//drag thumb
state|=3;
int val = criticalValue + (int)(((float)i - startDragPos) * valuePerPixel + 0.5f);
if(val<minValue) val=minValue;
else if(val>maxValue) val=maxValue;
if(value!=val){
value=val;
changed=true;
}
b=true;
}else if(bInControl_0){
int f2,f3;
if(valuePerPixel > 0){
f2=f+16;
f3=f1-16;
}else{
f2=f3=(f+f1)/2;
}
if(i<f){ //do nothing
}else if(valuePerPixel<=0){ //do nothing
}else if(i<(int)thumbStart){ //-largechange
state=(state&~0xFF)|2;
if(event.type==SDL_MOUSEBUTTONDOWN && event.button.button == SDL_BUTTON_LEFT) state=(state&~0x0000FF00)|((state&0xFF)<<8);
else if((state&0x0000FF00)&&((state&0xFF)!=((state>>8)&0xFF))) state&=~0xFF;
if(event.type==SDL_MOUSEBUTTONDOWN && event.button.button == SDL_BUTTON_LEFT){
int val=value-largeChange;
if(val<minValue) val=minValue;
if(value!=val){
value=val;
changed=true;
}
timer=8;
}
if(state&0xFF) criticalValue = minValue + (int)(float(i - f2) * valuePerPixel + 0.5f);
b=true;
}else if(i<(int)thumbEnd){ //start drag
state=(state&~0xFF)|3;
if(event.type==SDL_MOUSEBUTTONDOWN && event.button.button == SDL_BUTTON_LEFT) state=(state&~0x0000FF00)|((state&0xFF)<<8);
else if((state&0x0000FF00)&&((state&0xFF)!=((state>>8)&0xFF))) state&=~0xFF;
if(event.type==SDL_MOUSEBUTTONDOWN && event.button.button == SDL_BUTTON_LEFT){
criticalValue=value;
startDragPos = (float)i;
}
b=true;
}else if(i<f3){ //+largechange
state=(state&~0xFF)|4;
if(event.type==SDL_MOUSEBUTTONDOWN && event.button.button == SDL_BUTTON_LEFT) state=(state&~0x0000FF00)|((state&0xFF)<<8);
else if((state&0x0000FF00)&&((state&0xFF)!=((state>>8)&0xFF))) state&=~0xFF;
if(event.type==SDL_MOUSEBUTTONDOWN && event.button.button == SDL_BUTTON_LEFT){
int val=value+largeChange;
if(val>maxValue) val=maxValue;
if(value!=val){
value=val;
changed=true;
}
timer=8;
}
if(state&0xFF) criticalValue = minValue - largeChange + (int)(float(i - f2) * valuePerPixel + 0.5f);
b=true;
}
}
}
return b;
}
void GUISlider::renderScrollBarButton(int index,int x1,int y1,int x2,int y2,int srcleft,int srctop){
//Make sure the button isn't inverted.
if(x2<=x1||y2<=y1)
return;
//The color.
int clr=-1;
//Rectangle the size of the button.
SDL_Rect r={x1,y1,x2-x1,y2-y1};
//Check
if((state&0xFF)==index){
if(((state>>8)&0xFF)==index){
//Set the color gray.
clr=0xDDDDDDFF;
}else{
//Set the color to lightgray.
clr=0xFFFFFFFF;
}
}
//Draw a box.
drawGUIBox(r.x,r.y,r.w,r.h,screen,clr);
//Boolean if there should be an image on the button.
bool b;
b=(x2-x1>=14);
//Check if the image can be drawn.
if(b&&srcleft>=0&&srctop>=0){
//It can thus draw it.
SDL_Rect r1={srcleft,srctop,16,16};
r.x=(x1+x2)/2-8;
r.y=(y1+y2)/2-8;
SDL_BlitSurface(bmGUI,&r1,screen,&r);
}
}
void GUISlider::render(int x,int y,bool draw){
//There's no use in rendering the scrollbar when invisible.
if(!visible||!draw)
return;
//Check if the scrollbar is enabled.
if(enabled){
//Check if the state is right.
if((state&0xFF)==((state>>8)&0xFF)){
//Switch the state (change)/
switch(state&0xFF){
case 2:
//It's a lager negative change.
//Check if it's time.
if((--timer)<=0){
if(value<criticalValue)
state&=~0xFF;
else{
//Reduce the value.
int val=value-largeChange;
//Make sure it doesn't go too low.
if(val<minValue)
val=minValue;
if(value!=val){
value=val;
changed=true;
}
//Set the time to two.
timer=2;
}
}
break;
case 4:
//It's a lager positive change.
//Check if it's time.
if((--timer)<=0){
if(value>criticalValue)
state&=~0xFF;
else{
//Increase the value.
int val=value+largeChange;
//Make sure it doesn't go too high.
if(val>maxValue)
val=maxValue;
if(value!=val){
value=val;
changed=true;
}
//Set the time to two.
timer=2;
}
}
break;
}
}
}
//If the scrollbar changed then invoke a GUIEvent.
if(changed){
if(eventCallback){
GUIEvent e={eventCallback,name,this,GUIEventChange};
GUIEventQueue.push_back(e);
}
changed=false;
}
//We calculate the position since it could have changed.
calcPos();
//Now the actual drawing begins.
if(valuePerPixel>0){
//Draw the line the slider moves along.
drawGUIBox(x+left,y+top+(height-4)/2,width,4,screen,0);
renderScrollBarButton(2,x-1+(int)thumbStart,y+top+(height/4),x+1+(int)thumbEnd,y+top+(height/4)*3,16,16);
}else{
//There are two buttons so draw them.
int f=left+width/2;
renderScrollBarButton(1,x+left,y+top,x+1+f,y+top+height,48,0);
renderScrollBarButton(5,x+f,y+top,x+left+width,y+top+height,64,0);
}
}

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