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()<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<

 

 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());

       }
    }
}