#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    connect(ui->slider,SIGNAL(valueChanged(int)),this,SLOT(sliderchanged(int)));

    fd_edp = ::open("/sys/class/backlight/edp-backlight/brightness",O_RDWR|O_NONBLOCK);
    fd_lvds = ::open("/sys/class/backlight/lvds-backlight/brightness",O_RDWR|O_NONBLOCK);
	fd_dsi = ::open("/sys/class/backlight/dsi1-backlight/brightness",O_RDWR|O_NONBLOCK);
	setWindowState(Qt::WindowMaximized);
	setWindowFlags(Qt::FramelessWindowHint | Qt::WindowTitleHint | Qt::WindowCloseButtonHint);
	ui->slider->setMinimum(1);
    ui->slider->setValue(200);
	connect(ui->exitBtn, &QPushButton::clicked, this, [=](){
    close();
    });
}

MainWindow::~MainWindow()
{
    delete ui;
    if (fd_edp > 0)
    	::close(fd_edp);
    if (fd_dsi > 0)
    	::close(fd_dsi);
    if (fd_lvds > 0)
    	::close(fd_lvds);

}

void MainWindow::sliderchanged(int v)
{
    char buf[20];
    sprintf(buf,"%d",v);
    if (fd_edp > 0)
    	::write(fd_edp,buf,sizeof(buf));
    if (fd_dsi > 0)
    	::write(fd_dsi,buf,sizeof(buf));
    if (fd_lvds > 0)
    	::write(fd_lvds,buf,sizeof(buf));
}