QT:输入类控件的使用

LineEdit

录入个人信息

cpp 复制代码
#include "widget.h"
#include "ui_widget.h"
#include <QDebug>
#include <QString>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    // 初始化输入框
    ui->lineEdit_name->setPlaceholderText("输入姓名");
    ui->lineEdit_name->setClearButtonEnabled(true);

    ui->lineEdit_passwd->setPlaceholderText("输入密码");
    ui->lineEdit_passwd->setClearButtonEnabled(true);
    ui->lineEdit_passwd->setEchoMode(QLineEdit::Password);

    ui->lineEdit_tele->setPlaceholderText("输入电话");
    ui->lineEdit_tele->setClearButtonEnabled(true);
    ui->lineEdit_tele->setInputMask("000-0000-0000");
}

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


void Widget::on_pushButton_clicked()
{
    // 当点击的时候把信息拿出来
    QString gender = ui->radioButton_male->isChecked() ? "男" : "女";

    qDebug() << "姓名: " << ui->lineEdit_name->text();
    qDebug() << "密码: " << ui->lineEdit_passwd->text();
    qDebug() << "性别: " << gender;
    qDebug() << "电话: " << ui->lineEdit_tele->text();
}

检验两次密码是否相同

cpp 复制代码
#include "widget.h"
#include "ui_widget.h"
#include <QString>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    // 设置两个输入框是密码模式
    ui->lineEdit->setEchoMode(QLineEdit::Password);
    ui->lineEdit_2->setEchoMode(QLineEdit::Password);
}

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


void Widget::on_lineEdit_textEdited(const QString &arg1)
{
    QString s1 = ui->lineEdit->text();
    QString s2 = ui->lineEdit_2->text();

    if(s1.isEmpty() && s2.isEmpty())
        ui->label->setText("密码是空");
    else if(s1 == s2)
        ui->label->setText("密码一致");
    else
        ui->label->setText("密码不相同");
}

void Widget::on_lineEdit_2_textEdited(const QString &arg1)
{
    QString s1 = ui->lineEdit->text();
    QString s2 = ui->lineEdit_2->text();

    if(s1.isEmpty() && s2.isEmpty())
        ui->label->setText("密码是空");
    else if(s1 == s2)
        ui->label->setText("密码一致");
    else
        ui->label->setText("密码不相同");
}



切换显示密码

cpp 复制代码
#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    // 初始化模式
    ui->lineEdit->setEchoMode(QLineEdit::Password);
}

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


void Widget::on_checkBox_toggled(bool checked)
{
    if(checked)
        ui->lineEdit->setEchoMode(QLineEdit::Normal);
    else
        ui->lineEdit->setEchoMode(QLineEdit::Password);
}



Text Edit

表示的是多行输入框,并且还能提供滚动条

获取多行输入框的内容

当多行输入框内容改变后,把对应的信息传递到label中即可

cpp 复制代码
#include "widget.h"
#include "ui_widget.h"
#include <QString>
#include <QDebug>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
}

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


void Widget::on_textEdit_textChanged()
{
    QString content = ui->textEdit->toPlainText();
    qDebug() << content;
    ui->label->setText(content);
}

Combo Box

表示的是下拉框

使用下拉框模拟点餐系统

cpp 复制代码
#include "widget.h"
#include "ui_widget.h"
#include <QString>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    ui->comboBox->addItem("汉堡1");
    ui->comboBox->addItem("汉堡2");

    ui->comboBox_2->addItem("饮料1");
    ui->comboBox_2->addItem("饮料2");

    ui->comboBox_3->addItem("小吃1");
    ui->comboBox_3->addItem("小吃2");
    ui->comboBox_3->addItem("小吃3");
}

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


void Widget::on_pushButton_clicked()
{
    QString content = "汉堡选择: " + ui->comboBox->currentText();
    content += " 饮料选择: " + ui->comboBox_2->currentText();
    content += " 小吃选择: " + ui->comboBox_3->currentText();
    ui->label->setText(content);
}

Spin Box

这个表示的是微调框,是带有按钮的输入框,可以用来输入整数或者浮点数,通过按钮来修改数值的大小

调整食物的份数

cpp 复制代码
#include "widget.h"
#include "ui_widget.h"
#include <QDebug>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    ui->comboBox->addItem("汉堡1");
    ui->comboBox->addItem("汉堡2");

    ui->comboBox_2->addItem("饮料1");
    ui->comboBox_2->addItem("饮料2");

    ui->comboBox_3->addItem("小吃1");
    ui->comboBox_3->addItem("小吃2");
    ui->comboBox_3->addItem("小吃3");

    ui->spinBox->setValue(1);
    ui->spinBox->setRange(1, 10);
    ui->spinBox_2->setValue(1);
    ui->spinBox_2->setRange(1, 10);
    ui->spinBox_3->setValue(1);
    ui->spinBox_3->setRange(1, 10);

}

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


void Widget::on_pushButton_clicked()
{
    qDebug() << ui->comboBox->currentText() << " : " << ui->spinBox->value();
    qDebug() << ui->comboBox_2->currentText() << " : " << ui->spinBox_2->value();
    qDebug() << ui->comboBox_3->currentText() << " : " << ui->spinBox_3->value();
}

List Widget

使用ListWidget

cpp 复制代码
#include "widget.h"
#include "ui_widget.h"
#include <QDebug>
#include <QString>
#include <QListWidgetItem>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    ui->listWidget->addItem("C++");
    ui->listWidget->addItem("Java");
    ui->listWidget->addItem("Python");
}

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


void Widget::on_listWidget_currentItemChanged(QListWidgetItem *current, QListWidgetItem *previous)
{
    if(current && previous)
        qDebug() << "当前选中: " << current->text() << "之前选中" << previous->text();
}

void Widget::on_pushButton_clicked()
{
    // 获取到输入框内容
    QString text = ui->lineEdit->text();

    // 把内容加到列表中
    ui->listWidget->addItem(text);
}

void Widget::on_pushButton_2_clicked()
{
    // 获取当前选中的一行
    int row = ui->listWidget->currentRow();
    ui->listWidget->takeItem(row);
}



Table Widget

这个控件表示的是一个表格控件:

使用QTableWidget

cpp 复制代码
#include "widget.h"
#include "ui_widget.h"
#include <QString>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    // 创建三行
    ui->tableWidget->insertRow(0);
    ui->tableWidget->insertRow(1);
    ui->tableWidget->insertRow(2);

    // 创建三列
    ui->tableWidget->insertColumn(0);
    ui->tableWidget->insertColumn(1);
    ui->tableWidget->insertColumn(2);

    // 设置一下列名
    ui->tableWidget->setHorizontalHeaderItem(0, new QTableWidgetItem("学号"));
    ui->tableWidget->setHorizontalHeaderItem(1, new QTableWidgetItem("姓名"));
    ui->tableWidget->setHorizontalHeaderItem(2, new QTableWidgetItem("年龄"));

    // 设置初始数据
    ui->tableWidget->setItem(0, 0, new QTableWidgetItem("1001"));
    ui->tableWidget->setItem(0, 1, new QTableWidgetItem("张三"));
    ui->tableWidget->setItem(0, 2, new QTableWidgetItem("20"));

    ui->tableWidget->setItem(0, 0, new QTableWidgetItem("1002"));
    ui->tableWidget->setItem(0, 1, new QTableWidgetItem("李四"));
    ui->tableWidget->setItem(0, 2, new QTableWidgetItem("24"));

    ui->tableWidget->setItem(0, 0, new QTableWidgetItem("1003"));
    ui->tableWidget->setItem(0, 1, new QTableWidgetItem("王五"));
    ui->tableWidget->setItem(0, 2, new QTableWidgetItem("23"));
}

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


void Widget::on_pushButton_add_row_clicked()
{
    // 获取行数 + 新增一行
    int row = ui->tableWidget->rowCount();
    ui->tableWidget->insertRow(row);
}

void Widget::on_pushButton_add_cal_clicked()
{
    // 获取列数 + 新增一列
    int col = ui->tableWidget->columnCount();
    ui->tableWidget->insertColumn(col);
    // 设置列名
    QString colname = ui->lineEdit->text();
    ui->tableWidget->setHorizontalHeaderItem(col, new QTableWidgetItem(colname));
}

void Widget::on_pushButton_del_row_clicked()
{
    // 删除指定行
    int row = ui->tableWidget->currentRow();
    ui->tableWidget->removeRow(row);
}

void Widget::on_pushButton_del_cal_clicked()
{
    // 删除指定列
    int col = ui->tableWidget->currentColumn();
    ui->tableWidget->removeColumn(col);
}

Tree Widget

这个控件中的元素都是一个QTreeWidgetItem,每一个都可以包含多个文本和图标,每个文本和图标是一个列

使用QTreeWidget

cpp 复制代码
#include "widget.h"
#include "ui_widget.h"
#include <QString>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    ui->treeWidget->setHeaderLabel("动物");

    QTreeWidgetItem* treeitem1 = new QTreeWidgetItem();
    treeitem1->setText(0, "猫");
    ui->treeWidget->addTopLevelItem(treeitem1);

    QTreeWidgetItem* treeitem2 = new QTreeWidgetItem();
    treeitem2->setText(0, "鸟");
    ui->treeWidget->addTopLevelItem(treeitem2);

    QTreeWidgetItem* treeitem3 = new QTreeWidgetItem();
    treeitem3->setText(0, "鸡");
    ui->treeWidget->addTopLevelItem(treeitem3);
}

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


void Widget::on_pushButton_clicked()
{
    QString itemname = ui->lineEdit->text();
    if(itemname.isEmpty())
        return;

    QTreeWidgetItem* treeitem = new QTreeWidgetItem();
    treeitem->setText(0, itemname);
    ui->treeWidget->addTopLevelItem(treeitem);

}

void Widget::on_pushButton_2_clicked()
{
    QString itemname = ui->lineEdit->text();
    if(itemname.isEmpty())
        return;

    // 获取一下当前选中的信息
    QTreeWidgetItem* currentitem = ui->treeWidget->currentItem();
    if(currentitem == NULL)
        return;
    // 构造新的Item
    QTreeWidgetItem* newitem = new QTreeWidgetItem();
    newitem->setText(0, itemname);
    // 添加到选中节点
    currentitem->addChild(newitem);
    currentitem->setExpanded(true);
}

void Widget::on_pushButton_3_clicked()
{
    // 获取一下当前选中的信息
    QTreeWidgetItem* currentitem = ui->treeWidget->currentItem();
    if(currentitem == NULL)
        return;
    // 获取一下父节点
    QTreeWidgetItem* parent = currentitem->parent();
    if(parent == NULL)
        ui->treeWidget->takeTopLevelItem(ui->treeWidget->indexOfTopLevelItem(currentitem));
    else
        parent->removeChild(currentitem);
}
相关推荐
2401_857439692 小时前
SSM 架构下 Vue 电脑测评系统:为电脑性能评估赋能
开发语言·php
SoraLuna2 小时前
「Mac畅玩鸿蒙与硬件47」UI互动应用篇24 - 虚拟音乐控制台
开发语言·macos·ui·华为·harmonyos
xlsw_2 小时前
java全栈day20--Web后端实战(Mybatis基础2)
java·开发语言·mybatis
Dream_Snowar3 小时前
速通Python 第三节
开发语言·python
高山我梦口香糖4 小时前
[react]searchParams转普通对象
开发语言·前端·javascript
mahuifa4 小时前
混合开发环境---使用编程AI辅助开发Qt
人工智能·vscode·qt·qtcreator·编程ai
冷眼看人间恩怨4 小时前
【Qt笔记】QDockWidget控件详解
c++·笔记·qt·qdockwidget
信号处理学渣5 小时前
matlab画图,选择性显示legend标签
开发语言·matlab
红龙创客5 小时前
某狐畅游24校招-C++开发岗笔试(单选题)
开发语言·c++
jasmine s5 小时前
Pandas
开发语言·python