widget.h
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QListWidget>
#include <QListWidgetItem>
#include <QFile>
#include <QStandardPaths>
#include <QMessageBox>
QT_BEGIN_NAMESPACE
namespace Ui {
class Widget;
}
QT_END_NAMESPACE
class Widget : public QWidget
{
Q_OBJECT
public:
Widget(QWidget *parent = nullptr);
~Widget();
private slots:
void on_btnAdd_clicked();
void on_btnRemove_clicked();
void on_btnRemoveAll_clicked();
private:
Ui::Widget *ui;
QString path = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation) + "\\todoFile.txt";
};
#endif
widget.cpp
#include "widget.h"
#include "ui_widget.h"
Widget::Widget(QWidget *parent)
: QWidget(parent)
, ui(new Ui::Widget)
{
ui->setupUi(this);
this->setWindowTitle("Todo List App");
QFile file(path);
if(!file.open(QIODevice::ReadWrite)) {
QMessageBox::information(0, "error", file.errorString());
}
QTextStream in(&file);
while(!in.atEnd()) {
QListWidgetItem* item = new QListWidgetItem(in.readLine(), ui->listWidget);
ui->listWidget->addItem(item);
item->setFlags(item->flags() | Qt::ItemIsEditable);
}
}
Widget::~Widget()
{
QFile file(path);
if(!file.open(QIODevice::WriteOnly)) {
QMessageBox::information(0, "error", file.errorString());
}
QTextStream out(&file);
for (int i=0; i< ui->listWidget->count(); i++) {
out << ui->listWidget->item(i)->text() << Qt::endl;
}
file.close();
delete ui;
}
void Widget::on_btnAdd_clicked()
{
if(ui->lineEdit->text().isEmpty()) {
return;
}
QListWidgetItem * item = new QListWidgetItem(ui->lineEdit->text(), ui-> listWidget);
ui->listWidget->addItem(item);
item->setFlags(item->flags() | Qt::ItemIsEditable);
ui->lineEdit->clear();
ui->lineEdit->setFocus();
}
void Widget::on_btnRemove_clicked()
{
QListWidgetItem* item = ui->listWidget->takeItem(ui->listWidget->currentRow());
delete item;
}
void Widget::on_btnRemoveAll_clicked()
{
ui->listWidget->clear();
}