Change parameters of a class when clicking button on different window - c++

Question

I'm pretty new to c++ and Qt but I'm trying to create a simple battleship game. So far I have been able to set up the grid and also place ships but I wan't to put in a menu before the main game window where you choose "difficulty" which will determine how big the grid size for battleship is.
The code for drawing the game board goes as follows:
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "boardrender.h"
#include "playerrender.h"
#include "../BattleScrabble/BattleshipBoard.h"
#include "../BattleScrabble/HumanPlayer.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
// BattleshipBoard *a = new BattleshipBoard(10);
// Ship *b = new Ship(AircraftCarrier);
ui->battleshipBoardView->setMouseTracking(true);
// BoardRender *scene=new BoardRender(a, ui->battleshipBoardView->width(), this);
// ui->battleshipBoardView->setScene(scene);
ui->battleshipBoardView->resize(ui->battleshipBoardView->width(),ui->battleshipBoardView->width());
Player *b = new HumanPlayer(10,0);
PlayerRender *a = new PlayerRender(b, ui->battleshipBoardView,this);
}
MainWindow::~MainWindow()
{
delete ui;
}
where new HumanPlayer(10,0); is the grid size.
And now the interesting part, the difficulty window:
#include "difficultywindow.h"
#include "ui_difficultywindow.h"
#include "DifficultyWindow.h"
#include "mainwindow.h"
#include "ui_mainwindow.h"
DifficultyWindow::DifficultyWindow(QWidget *parent) :
QDialog(parent),
ui(new Ui::DifficultyWindow)
{
ui->setupUi(this);
}
DifficultyWindow::~DifficultyWindow()
{
delete ui;
}
void DifficultyWindow::on_pushButton_clicked()
{
mWindow = new MainWindow(this);
mWindow->show();
}
when I'm instantiating the "new MainWindow" is there a way to change the HumanPlayer parameters in this class instead?
Any help is greatly appreciated. Thanks :)
edit: and my main.cpp
#include "mainwindow.h"
#include <QApplication>
#include "difficultywindow.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
DifficultyWindow w;
w.show();
return a.exec();
}

Answer 1

You have to make some modifications, to make your code more understandable you must first add a parameter to MainWidow, in this case it will be called grid
mainwindow.h
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(int grid, QWidget *parent = 0);
~MainWindow();
private:
Ui::MainWindow *ui;
Player *b;
PlayerRender *g;
};
mainwindow.cpp
MainWindow::MainWindow(int grid, QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
ui->battleshipBoardView->setMouseTracking(true);
ui->battleshipBoardView->resize(ui->battleshipBoardView->width(),ui->battleshipBoardView->width());
b = new HumanPlayer(grid, 0);
g = new PlayerRender(b, ui->battleshipBoardView,this);
}
Then we will create an enumeration and to handle a signal instead of 3 we will use QButtonGroup:
difficultyWindow.h
class difficultyWindow : public QDialog
{
Q_OBJECT
public:
enum Difficult{
EASY,
MEDIUM,
HARD
};
explicit difficultyWindow(QWidget *parent = 0);
~difficultyWindow();
private slots:
void onClicked(int id);
private:
Ui::difficultyWindow *ui;
MainWindow *mWindow;
QButtonGroup *group;
};
difficultyWindow.h
difficultyWindow::difficultyWindow(QWidget *parent) :
QDialog(parent),
ui(new Ui::difficultyWindow)
{
ui->setupUi(this);
group = new QButtonGroup(this);
group->addButton(ui->easyDiffButton, EASY);
group->addButton(ui->mediumDifficultyButton, MEDIUM);
group->addButton(ui->hardDifficultyButton, HARD);
connect(group, SIGNAL(buttonClicked(int)), this, SLOT(onClicked(int)));
}
difficultyWindow::~difficultyWindow()
{
delete ui;
}
void difficultyWindow::onClicked(int id)
{
int grid;
switch (id) {
case EASY:
grid = 10;
break;
case MEDIUM:
grid = 20;
break;
case HARD:
grid = 30;
break;
}
mWindow = new MainWindow(grid, this);
mWindow->show();
}
Note: eliminate the slots, its are unnecessary for this case.