QT study notes 5

1. Modal dialog box, message dialog box display information QMessageBox

1. Error dialog box:

 QMessageBox::critical(this,"error","程序错误");

2. Warning dialog box:

QMessageBox::warning(this,"error","不要乱点");

3. Message dialog box:

QMessageBox::information(this,"run","提示，我是你爹");

4. Selection dialog:

QMessageBox::question(this,"选择对话框","是否保存",QMessageBox::Yes|QMessageBox::No|QMessageBox::Cancel,QMessageBox::NoButton);

//后面是创建三个按钮

 QMessageBox::StandardButton res;
    res=QMessageBox::question(this,"选择对话框","是否保存",QMessageBox::Yes|QMessageBox::No|QMessageBox::Cancel,QMessageBox::NoButton);
    if(res==QMessageBox::Yes){
        qDebug()<<"正在保存";
    }else if(res==QMessageBox::No){
        qDebug()<<"不保存";
    }else{
         qDebug()<<"取消操作";
    }

2. Input dialog box QInputDialog

QInputDialog: input text/integer data/floating point data

void MainWindow::on_pushButton_9_clicked()
{
    //生成输入文字对话框

    bool ok;
    QString text = QInputDialog::getText(this, tr("输入文字对话框"),
                                         tr("请输入文字"), QLineEdit::Normal,"demo", &ok);
    if (ok && !text.isEmpty())
        ui->plainTextEdit->appendPlainText(text);
}

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QStatusBar>
#include <QDialog>
#include <QFileDialog>
#include <QColorDialog>
#include <QFontDialog>
#include <QMessageBox>
#include <QDebug>
#include <QInputDialog>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    ui->statusbar->showMessage("作者",3000);
    QToolBar *qtboolbar=new QToolBar(this);
        //穿件工具栏
    this->addToolBar(qtboolbar);

    QAction *tool1=new QAction("运行");
    QAction *tool2=new QAction("调试");
    QAction *tool3=new QAction("编译");
    qtboolbar->addAction(tool1);
    qtboolbar->addAction(tool2);
    qtboolbar->addAction(tool3);

//    QDialog *qdialog=new  QDialog;
//    qdialog->setAttribute(Qt::WA_DeleteOnClose);
//    qdialog->setWindowTitle(tr("对话框"));
//    qdialog->show();

}

MainWindow::~MainWindow()
{
    delete ui;
}


void MainWindow::on_pushButton_clicked()
{

    QString fileName = QFileDialog::getOpenFileName(this, tr("打开文件"),"./",tr("Images (*.png *.xpm *.jpg)","Text(*.txt)"));
    if(!fileName.isEmpty()){
        ui->plainTextEdit->appendPlainText(fileName);
    }

}

void MainWindow::on_pushButton_2_clicked()
{
    QStringList files = QFileDialog::getOpenFileNames(
                             this,
                             "打开文件",
                             "./",
                             "Images (*.png *.xpm *.jpg)");
    for(int i=0;i<files.count();i++){
         ui->plainTextEdit->appendPlainText(files[i]);
    }

}


void MainWindow::on_pushButton_3_clicked()
{
    QPalette pal=ui->plainTextEdit->palette();
    //获取现有调色板数据
    QColor iniColort=pal.color(QPalette::Text);
    //现有的文字颜色
    QColor color1=QColorDialog::getColor(iniColort,this,"选择颜色");
    //选择颜色
    if(color1.isValid()){
        //判断是和否存在
        pal.setColor(QPalette::Text,color1);
        //将调色板子的文字数据改变为返回的颜色
        ui->plainTextEdit->setPalette(pal);
        //设置调色板
    }
}


void MainWindow::on_pushButton_4_clicked()
{
     bool ok;
     QFont inift=ui->plainTextEdit->font();
     //获得原有文本框字体
     QFont font = QFontDialog::getFont(&ok,inift,this);
     //返回一个字体类
     if (ok) {
         ui->plainTextEdit->setFont(font);
     } else {

     }

}


void MainWindow::on_pushButton_5_clicked()
{
    //错误对话框
    QMessageBox::critical(this,"error","程序错误");
}


void MainWindow::on_pushButton_6_clicked()
{
    QMessageBox::warning(this,"warning","不要乱点");

}

void MainWindow::on_pushButton_7_clicked()
{
    QMessageBox::information(this,"run","提示，我是你爹",QMessageBox::Ok,QMessageBox::NoButton);
}

void MainWindow::on_pushButton_8_clicked()
{
    QMessageBox::StandardButton res;
    res=QMessageBox::question(this,"选择对话框","是否保存",QMessageBox::Yes|QMessageBox::No|QMessageBox::Cancel,QMessageBox::NoButton);
    if(res==QMessageBox::Yes){
        qDebug()<<"正在保存";
    }else if(res==QMessageBox::No){
        qDebug()<<"不保存";
    }else{
         qDebug()<<"取消操作";
    }

}

void MainWindow::on_pushButton_9_clicked()
{
    //生成输入文字对话框

    bool ok;
    QString text = QInputDialog::getText(this, tr("输入文字对话框"),
                                         tr("请输入文字"), QLineEdit::Normal,"demo", &ok);
    if (ok && !text.isEmpty())
        ui->plainTextEdit->appendPlainText(text);
}

3. Layout Manager

1 Overview

determine positioning, layout positioning

Determine the positioning: the length and height of the component and the coordinate value need to be provided

Layout positioning: which layout needs to be specified

Vertical Layout, Horizontal Layout, Grid Layout, Table Layout

2. Layout usage

New page:

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    this->new_window=new Form();
    connect(ui->pushButton,&QPushButton::clicked,this,[=](){
        this->hide();//主页面隐藏
        this->new_window->show();
    });
}

Widget::~Widget()
{
    delete ui;
}

Click Login, this interface is hidden, and the login success page appears.

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    this->new_window=new Form();
    connect(ui->pushButton,&QPushButton::clicked,this,[=](){
        this->hide();//主页面隐藏
        this->new_window->show();
    });
    connect(this->new_window,&Form::back,this,[=](){
        this->new_window->hide();
        this->show();
    });
}

Widget::~Widget()
{
    delete ui;
}

#include "form.h"
#include "ui_form.h"


Form::Form(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Form)
{
    ui->setupUi(this);
    connect(ui->pushButton,SIGNAL(clicked(bool)),this,SIGNAL(back()));

}

Form::~Form()
{
    delete ui;
}

Click Back to return to the login page.

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