Qt day3

关于文本编辑器：

widget.h:

#ifndef WIDGET_H
#define WIDGET_H
 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
 
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_fontbtn_clicked();
 
    void on_colorbtn_clicked();
 
    void on_openbtn_clicked();
 
    void on_savebtn_clicked();
 
private:
    Ui::Widget *ui;
};
#endif // WIDGET_H

 widget.cpp:

#include "widget.h"
#include "ui_widget.h"
 
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
}
 
Widget::~Widget()
{
    delete ui;
}
 
 
void Widget::on_fontbtn_clicked()
{
    bool  ok;
    QFont f = QFontDialog::getFont(&ok,
                                   QFont("隶书",10,10,false),
                                   this,
                                   "选择字体");
 
    if(ok){
 
        //ui->textEdit->setFont(f);
 
        ui->textEdit->setCurrentFont(f);
 
    }else{
        QMessageBox::information(this,"取消","用户取消了选择字体");
 
    }
}
 
 
void Widget::on_colorbtn_clicked()
{
    QColor c = QColorDialog::getColor(QColor("blue"),
                                      this,
                                      "选择颜色");
 
    if(c.isValid()){
        ui->textEdit->setTextColor(c);
    }else{
        QMessageBox::information(this,"取消","用户取消改变颜色");
    }
}
 
 
 
 
void Widget::on_openbtn_clicked()
{
    QString fileName = QFileDialog::getOpenFileName(this,
                                                    "选择文件",
                                                    "./",
                                                   "All(*.*);;Images(*.png *.xpm *.jpg);;Text files(*.txt);;");
 
    if(fileName.isNull()){
        QMessageBox::information(this,"提示","取消选择文件");
        return;
    }
        qDebug()<
 
        QFile file(fileName);
 
        if(!file.isOpen()){
            if(!file.open(QFile::ReadWrite)){
 
                QMessageBox::critical(this,"失败","文件打开失败");
                return;
            }
        }
 
        QByteArray msg = file.readAll();
 
        file.close();
 
        ui->textEdit->setText(msg);
}
 
 
void Widget::on_savebtn_clicked()
{
    //创建一个文件用来保存
    QFileDialog fileDialog;
    QString fileName = fileDialog.getSaveFileName(this,"打开文件","/my_data","Text file(*.txt)");
    if(fileName == ""){
 
        return;
    }
    //选择路径保存文件名
    QFile file(fileName);
    if(!file.open(QIODevice::WriteOnly|QIODevice::Text)){
        QMessageBox::warning(this,"错误","打开文件失败");
        return;
    }
    else{
        QTextStream textStream(&file);
        //将自己的文本文件保存到指定路径
        QString s = ui->textEdit->toPlainText();
        textStream<
        QMessageBox::information(this,"提示","文件保存成功");
        file.close();
    }
}

 

 一个小闹钟：

widget.h:

#ifndef WIDGET_H
#define WIDGET_H
 
#include 
#include 
#include 
#include 
 
 
 
QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE
 
class Widget : public QWidget
{
    Q_OBJECT
 
public:
    Widget(QWidget *parent = nullptr);
    ~Widget();
 
    void timerEvent(QTimerEvent *e) override;
 
private slots:
    void on_startbtn_clicked();
 
    void on_closebtn_clicked();
 
private:
    Ui::Widget *ui;
 
    int timer_id;
 
    //定义一个播报员
    QTextToSpeech *speecher;
};
#endif // WIDGET_H

 widget.cpp:

#include "widget.h"
#include "ui_widget.h"
 
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
 
}
 
Widget::~Widget()
{
    delete ui;
}
 
 
 
void Widget::on_startbtn_clicked()
{
    timer_id = this->startTimer(1000);
 
 
}
 
void Widget::on_closebtn_clicked()
{
    //this->killTimer(timer_id);
    //清空定时文本内容，他读不了一点
    ui->lineEdit->clear();
    speecher->stop();
}
 
void Widget::timerEvent(QTimerEvent *e){
    if(e->timerId() == timer_id){
        QTime sys_t = QTime::currentTime();
 
        QString t = sys_t.toString("hh.mm.ss");
 
        ui->timeLab->setText(t);
 
 
        //给播报员实例化空间（不能在if语句内，会内存泄漏（应该吧））
        speecher = new QTextToSpeech(this);
        if(t == ui->lineEdit->text()){
 
           speecher->say(ui->textEdit->toPlainText());
 
       }
    }
}