window.cpp

#include "window.h"
#include <QApplication>
#include <QDebug>
#include <QPushButton>
#include <QSlider>
#include <QGridLayout>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QSpacerItem>
#include <QTimer>


Window::Window(QWidget *parent)
    : QWidget{parent}
{
    solveButton = new QPushButton("solve", this);
    connect(solveButton, SIGNAL(clicked()), this, SLOT(solveButtonClicked()));
    clearButton = new QPushButton("Clear", this);
    connect(clearButton, SIGNAL(clicked()), this, SLOT(clearButtonClicked()));

    slider = new QSlider(this);
    slider->setRange(0, 1000);
    slider->setOrientation(Qt::Horizontal);
    slider->setValue(delayTime);
    connect(slider, SIGNAL(valueChanged(int)), this, SLOT(setValue(int)));

    horizontalLayout = new QHBoxLayout(this);
    verticalLayout = new QVBoxLayout();
    layout = new QGridLayout();

    spacer[0] = new QSpacerItem(4, 4, QSizePolicy::Minimum, QSizePolicy::Fixed);
    spacer[1] = new QSpacerItem(4, 4, QSizePolicy::Minimum, QSizePolicy::Fixed);
    spacer[2] = new QSpacerItem(8, 8, QSizePolicy::Minimum, QSizePolicy::Expanding);
    verticalLayout->addItem(spacer[2]);

    verticalLayout->addWidget(solveButton);
    verticalLayout->addWidget(slider);
    verticalLayout->addWidget(clearButton);
    horizontalLayout->addLayout(layout, 5);
    horizontalLayout->addLayout(verticalLayout, 1);

    layout->addItem(spacer[0], 3, 3);
    layout->addItem(spacer[1], 7, 7);
    layout->setSpacing(0);

    for (int x = 0; x < 9; x++)
    {
        for (int y = 0; y < 9; y++)
        {
            grid[x + y * 9].setParent(this);
            layout->addWidget(&grid[x + y * 9], y + y / 3, x + x / 3);
            // connecting signals & slots
            for (int d = 0; d < 9; d++) // rows and columns
            {
                connect(&grid[x + y * 9], SIGNAL(update(int)), &grid[x + d * 9], SLOT(removeOption(int)));
                connect(&grid[x + y * 9], SIGNAL(undo(int)), &grid[x + d * 9], SLOT(addOption(int)));
                if(&grid[x+y*9]!= &grid[d+y*9]){
                    connect(&grid[x + y * 9], SIGNAL(update(int)), &grid[d + y * 9], SLOT(removeOption(int)));
                    connect(&grid[x + y * 9], SIGNAL(undo(int)), &grid[d + y * 9], SLOT(addOption(int)));
                }
            }
            int a = x / 3 * 3;
            int b = y / 3 * 3;
            for (int x1 = a; x1 < a + 3; x1++) // square
            {
                for (int y1 = b; y1 < b + 3; y1++)
                {
                    if (x1 == x || y1 == y)
                        continue;
                    connect(&grid[x + y * 9], SIGNAL(update(int)), &grid[x1 + y1 * 9], SLOT(removeOption(int)));