#include "widget.h"

#include <QPushButton>
#include <QVBoxLayout>
#include <QApplication>
#include <QTimer>

TestWidget::TestWidget(QWidget *parent)
    : QWidget(parent)
{
    setFixedSize(600, 400);

    QPushButton* ptr_button = new QPushButton(this);
    ptr_button->setText("i am unresponsive");
    ptr_button->setFixedSize(200, 50);
    ptr_button->show();

    QWidget* ptr_w = new QWidget(this);
    ptr_w->winId();  //  key code

    QVBoxLayout* ptr_layout = new QVBoxLayout(this);
    ptr_layout->addWidget(ptr_button);
    ptr_layout->addWidget(ptr_w);
}

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    setFixedSize(600, 400);

    ptr_curtain_ = new Curtain();

    QPushButton* ptr_button = new QPushButton(this);
    ptr_button->setText("click me to show widget");
    ptr_button->setFixedSize(200, 50);
    connect(ptr_button, &QPushButton::clicked, this, [=]() {
        if (ptr_curtain_ != NULL)
        {
            QTimer::singleShot(0, this, [=]() {
                TestWidget* ptr_test = new TestWidget;
                ptr_test->show();

                ptr_curtain_->Quit();
                ptr_curtain_->deleteLater();
                ptr_curtain_ = NULL;
            });

            ptr_curtain_->Exec();
        }
    });
}

Widget::~Widget()
{

}

Curtain::Curtain(QWidget *parent) : QWidget(parent)
{
    setWindowModality(Qt::ApplicationModal);   // key code
    setFixedSize(300, 300);
}

void Curtain::Exec()
{
    show();

    exec_ = true;
    while (exec_)
    {
        qApp->processEvents();
    }
}

void Curtain::Quit()
{
    close();

    exec_ = false;
}