73 lines
2.6 KiB
C++
73 lines
2.6 KiB
C++
#include "mainwindow3.h"
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MainWindow3::MainWindow3(QWidget *parent) : QMainWindow(parent)
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{
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setWindowTitle("对话框学习中...");
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setWindowIcon(QIcon(":/icon/start"));
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resize(1200, 960);
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mEdit = new QTextEdit(this);
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//mEdit->close();
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setCentralWidget(mEdit);
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QStatusBar *bar = new QStatusBar(this);
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btn1 = new QPushButton("打开文本文件", bar);
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btn2 = new QPushButton("保存文本文件", bar);
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btn3 = new QPushButton("颜色对话框", bar);
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btn4 = new QPushButton("字体对话框", bar);
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bar->addWidget(btn1);
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bar->addWidget(btn2);
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bar->addWidget(btn3);
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bar->addWidget(btn4);
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connect(btn1, &QPushButton::clicked, [&](){
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// 获取待打开的文件名 (已存在的文件)
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// QString fileName = QFileDialog::getOpenFileName(this, "选择图片文件", ".", "Png(*.png);;Jpeg(*.jpg)");
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QString fileName = QFileDialog::getOpenFileName(this, "选择文本文件", ".", "Text(*.txt)");
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qDebug() << "打开文件的位置：" << fileName ;
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QFile file(fileName);
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if(!file.open(QIODevice::ReadOnly|QIODevice::Text)){
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// 以只读文本的模式打开文件失败
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QMessageBox::critical(this, "错误", fileName+" 打开失败!");
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return;
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}
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QTextStream in(&file);
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mEdit->setText(in.readAll());
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file.close();
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});
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connect(btn2, &QPushButton::clicked, [&](){
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// 保存文件时，获取待保存的文件名 （可以是新文件）
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// QString fileName = QFileDialog::getSaveFileName(this,"保存文件位置",".");
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QString fileName = QFileDialog::getSaveFileName(this,"保存文件位置","d:/", "Text(*.txt)");
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qDebug() << "保存文件的位置: " << fileName ;
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QFile file(fileName);
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if(!file.open(QIODevice::WriteOnly|QIODevice::Text)){
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QMessageBox::critical(this, "错误", fileName+" 保存失败!");
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return;
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}
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QTextStream out(&file);
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// 将文本编辑控件 mEdit 中的文本写入到文件中。
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out << mEdit->toPlainText(); // 调用 mEdit->toPlainText() 将返回编辑控件中的纯文本内容
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file.close();
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});
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connect(btn3, &QPushButton::clicked, [&](){
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QColor color = QColorDialog::getColor(Qt::black,this,"字体颜色选择");
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mEdit->setTextBackgroundColor(color);
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// mEdit->setTextColor(color); // 条件: 光标选中的文本来设置颜色
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});
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connect(btn4, &QPushButton::clicked, [&](){
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bool yes = true;
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QFont font = QFontDialog::getFont(&yes,this);
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mEdit->setCurrentFont(font);
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});
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setStatusBar(bar);
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}
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