backlight.cpp
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#include "backlight.h"
#include "system.h"
namespace {
int setting = 7;
bool lowered = false;
int toSystem(int setting)
{
switch (setting)
{
case 0:
return 3;
case 1:
return 4;
case 2:
return 5;
case 3:
return 6;
case 4:
return 7;
case 5:
return 8;
case 6:
return 9;
case 7:
return 10;
}
}
}
void Backlight::lower()
{
lowered = true;
int t = setting - 2;
if (t < 0)
System::setBacklight(toSystem(0));
else
System::setBacklight(toSystem(t));
}
void Backlight::restore()
{
lowered = false;
System::setBacklight(toSystem(setting));
}
void Backlight::set(int level)
{
if (level < 0 || level > 7)
return;
setting = level;
if (lowered)
lower();
else
restore();
}