Qt dialog

qtdemo02/main.cpp

@@ -1,11 +1,13 @@
 #include "mainwindow.h"
+#include "mainwindow2.h"
+#include "mainwindow3.h"
 
 #include <QApplication>
 
 int main(int argc, char *argv[])
 {
     QApplication a(argc, argv);
-    MainWindow w;
+    MainWindow3 w;
     w.show();
     return a.exec();
 }

qtdemo02/mainwindow2.cpp

@@ -0,0 +1,109 @@
+#include "mainwindow2.h"
+#include <QDebug>
+#include <QFileDialog>
+
+MainWindow2::MainWindow2(QWidget *parent) : QMainWindow(parent)
+{
+    setWindowTitle("对话框学习中...");
+    setWindowIcon(QIcon(":/icon/open"));
+    resize(1200,960);
+
+    mEdit = new QTextEdit(this);
+    mEdit->close();
+    setCentralWidget(mEdit);
+
+    setCentralWidget(new QTextEdit(this));
+    QStatusBar *status_bar = new QStatusBar(this);
+    btn1 = new QPushButton("按钮1",status_bar);
+    btn2 = new QPushButton("按钮2",status_bar);
+    btn3 = new QPushButton("按钮3",status_bar);
+    btn4 = new QPushButton("定制MessageBox",status_bar);
+    btn5 = new QPushButton("button5",status_bar);
+    status_bar->addWidget(btn1);
+    status_bar->addWidget(btn2);
+    status_bar->addWidget(btn3);
+    status_bar->addWidget(btn4);
+    status_bar->addWidget(btn5);
+    setStatusBar(status_bar);
+
+    connect(btn1,&QPushButton::clicked,[&](){
+        QDialog dialog;
+        dialog.setWindowTitle(tr("自定义对话框 %1").arg(1));
+        // dialog.exec(); // 应用级别的模态对话框
+        dialog.show();
+    });
+    //    connect(btn2,&QPushButton::clicked,[&](){
+    //        QDialog *dialog = new QDialog(this);
+    //        dialog->setWindowTitle(tr("自定义对话框 %1").arg(2));
+    //        dialog->setAttribute(Qt::WA_DeleteOnClose); // 当关闭对话时，自动释放堆空间
+    //        dialog->open(); // 窗口级别的模态对话框
+
+    //    });
+    //    connect(btn3,&QPushButton::clicked,[&](){
+    //        QDialog *dialog = new QDialog(this);
+    //        dialog->setWindowTitle(tr("自定义对话框 %1").arg(3));
+    //        dialog->setAttribute(Qt::WA_DeleteOnClose); // 当关闭对话时，自动释放堆空间
+    //        dialog->show(); // 窗口级别的非模态对话框
+    //    });
+
+
+
+    connect(btn2,&QPushButton::clicked,[&](){
+        QMessageBox::warning(this,"警告","你的操作可能会失败...");
+    });
+    connect(btn3,&QPushButton::clicked,[&](){
+        //        QMessageBox::StandardButton ret;
+        //        ret = QMessageBox::question(this,"询问","选什么内容？");
+        //        if(ret == QMessageBox::Yes)
+        //            qDebug()<<"选了行";
+        //        else
+        //            qDebug()<<"没选行";
+        //        QMessageBox::critical(this,"警告","太警告了");
+        QMessageBox::information(this,"info","no info",QMessageBox::NoButton,QMessageBox::Apply);
+    });
+
+    connect(btn4,&QPushButton::clicked,[&](){
+        QMessageBox *msgBox = new QMessageBox(this);
+        msgBox->setAttribute(Qt::WA_DeleteOnClose);
+
+        //        msgBox->setIcon(QMessageBox::Critical);
+        //        msgBox->setWindowTitle("自定义错误提示");
+        msgBox->setText("Error");
+        msgBox->setInformativeText("An error occurred while processing the request.");
+        msgBox->setStandardButtons(QMessageBox::Save|QMessageBox::Discard|QMessageBox::Cancel);
+        msgBox->setDefaultButton(QMessageBox::Cancel);
+        int ret = msgBox->exec(); // 会返回一个 int
+        switch (ret) {
+        case QMessageBox::Ok:
+            qDebug()<<"Ok";
+            break;
+        case QMessageBox::Yes:
+            qDebug()<<"Yes";
+            break;
+        case QMessageBox::No:
+            qDebug()<<"No";
+            break;
+        }
+    });
+
+    connect(btn5,&QPushButton::clicked,[&](){
+
+        //            if(QMessageBox::Yes == QMessageBox::question(
+        //                        this,
+        //                        tr("Question"),
+        //                        tr("Are you OK?"),
+        //                        QMessageBox::Yes|QMessageBox::No,
+        //                        QMessageBox::Yes))
+        //            {
+        //                QMessageBox::information(this,tr("Hmmm..."),
+        //                                         tr("I'm glad to hear that!"));
+        //            }
+        //            else{
+        //                QMessageBox::information(this,
+        //                                         tr("Hmmm..."),
+        //                                         tr("I'm sorry!"));
+        //            }
+
+        QMessageBox msgBox;
+    });
+}

qtdemo02/mainwindow2.h

@@ -0,0 +1,26 @@
+#ifndef MAINWINDOW2_H
+#define MAINWINDOW2_H
+
+#include <QMainWindow>
+#include <QDialog>
+#include <QTextEdit>
+#include <QPushButton>
+#include <QStatusBar>
+#include <QMessageBox>
+#include <QTextEdit>
+
+class MainWindow2 : public QMainWindow
+{
+    Q_OBJECT
+    QPushButton *btn1,*btn2,*btn3,*btn4,*btn5;
+    QTextEdit *mEdit;
+public:
+    explicit MainWindow2(QWidget *parent = nullptr);
+
+public:
+
+signals:
+
+};
+
+#endif // MAINWINDOW2_H

qtdemo02/mainwindow3.cpp

@@ -0,0 +1,72 @@
+#include "mainwindow3.h"
+
+MainWindow3::MainWindow3(QWidget *parent) : QMainWindow(parent)
+{
+    setWindowTitle("对话框学习中...");
+    setWindowIcon(QIcon(":/icon/start"));
+    resize(1200, 960);
+
+    mEdit = new QTextEdit(this);
+    //mEdit->close();
+    setCentralWidget(mEdit);
+
+
+    QStatusBar *bar = new QStatusBar(this);
+    btn1 = new QPushButton("打开文本文件", bar);
+    btn2 = new QPushButton("保存文本文件", bar);
+    btn3 = new QPushButton("颜色对话框", bar);
+    btn4 = new QPushButton("字体对话框", bar);
+    bar->addWidget(btn1);
+    bar->addWidget(btn2);
+    bar->addWidget(btn3);
+    bar->addWidget(btn4);
+
+    connect(btn1, &QPushButton::clicked, [&](){
+        // 获取待打开的文件名 (已存在的文件)
+        // QString fileName = QFileDialog::getOpenFileName(this, "选择图片文件", ".", "Png(*.png);;Jpeg(*.jpg)");
+        QString fileName = QFileDialog::getOpenFileName(this, "选择文本文件", ".", "Text(*.txt)");
+        qDebug() << "打开文件的位置：" << fileName ;
+        QFile file(fileName);
+        if(!file.open(QIODevice::ReadOnly|QIODevice::Text)){
+            // 以只读文本的模式打开文件失败
+            QMessageBox::critical(this, "错误", fileName+" 打开失败!");
+            return;
+        }
+
+        QTextStream in(&file);
+        mEdit->setText(in.readAll());
+        file.close();
+    });
+
+    connect(btn2, &QPushButton::clicked, [&](){
+        // 保存文件时，获取待保存的文件名 （可以是新文件）
+        // QString fileName = QFileDialog::getSaveFileName(this,"保存文件位置",".");
+         QString fileName = QFileDialog::getSaveFileName(this,"保存文件位置","d:/", "Text(*.txt)");
+         qDebug() << "保存文件的位置: " << fileName ;
+        QFile file(fileName);
+        if(!file.open(QIODevice::WriteOnly|QIODevice::Text)){
+            QMessageBox::critical(this, "错误", fileName+" 保存失败!");
+            return;
+        }
+        QTextStream out(&file);
+        // 将文本编辑控件 mEdit 中的文本写入到文件中。
+        out << mEdit->toPlainText(); // 调用 mEdit->toPlainText() 将返回编辑控件中的纯文本内容
+        file.close();
+    });
+
+    connect(btn3, &QPushButton::clicked, [&](){
+        QColor color = QColorDialog::getColor(Qt::black,this,"字体颜色选择");
+
+        mEdit->setTextBackgroundColor(color);
+//        mEdit->setTextColor(color); // 条件: 光标选中的文本来设置颜色
+    });
+
+    connect(btn4, &QPushButton::clicked, [&](){
+        bool yes = true;
+        QFont font = QFontDialog::getFont(&yes,this);
+        mEdit->setCurrentFont(font);
+
+    });
+
+    setStatusBar(bar);
+}

qtdemo02/mainwindow3.h

@@ -0,0 +1,29 @@
+#ifndef MAINWIDGET3_H
+#define MAINWIDGET3_H
+
+#include <QMainWindow>
+#include <QDialog>
+#include <QTextEdit>
+#include <QPushButton>
+#include <QStatusBar>
+#include <QMessageBox>
+#include <QTextEdit>
+#include <QTextStream>
+#include <QFileDialog>
+#include <QColorDialog>
+#include <QFontDialog>
+#include <QDebug>
+
+class MainWindow3 : public QMainWindow
+{
+    Q_OBJECT
+    QPushButton *btn1,*btn2,*btn3,*btn4,*btn5;
+    QTextEdit *mEdit;
+public:
+    explicit MainWindow3(QWidget *parent = nullptr);
+
+signals:
+
+};
+
+#endif // MAINWIDGET3_H

qtdemo02/qtdemo02.pro

@@ -18,10 +18,14 @@ DEFINES += QT_DEPRECATED_WARNINGS
 SOURCES += \
     main.cpp \
     mainwindow.cpp \
+    mainwindow2.cpp \
+    mainwindow3.cpp \
     widget1.cpp
 
 HEADERS += \
     mainwindow.h \
+    mainwindow2.h \
+    mainwindow3.h \
     widget1.h
 
 # Default rules for deployment.