Bootstrap

Qt 5.14.2 学习记录 —— 구 Buttons 常用控件


1、QPushButton

QPushButton继承自QAbstractButton类,这是一个抽象类,是其它按钮的父类。抽象类包含纯虚函数,无法创建实例,只能创建子类,子类重写纯虚函数。

在这里插入图片描述

写一个图标放在按钮上:

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

    QIcon icon(":/yd.png");
    ui->pushButton->setIcon(icon);
    ui->pushButton->setIconSize(QSize(70, 70));
}

快捷键

找四个箭头图片当作快捷键,分别控制上下左右。

在这里插入图片描述

#include "widget.h"
#include "ui_widget.h"
#include <QDebug>
#include <QPushButton>

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

    ui->pushButton_target->setIcon(QIcon(":/img/ztk.jpg"));
    ui->pushButton_target->setIconSize(QSize(70, 70));

    ui->pushButton_up->setIcon(QIcon(":/img/up.png"));
    ui->pushButton_up->setIconSize(QSize(40, 40));

    ui->pushButton_down->setIcon(QIcon(":/img/down.png"));
    ui->pushButton_down->setIconSize(QSize(40, 40));

    ui->pushButton_left->setIcon(QIcon(":/img/left.png"));
    ui->pushButton_left->setIconSize(QSize(40, 40));

    ui->pushButton_right->setIcon(QIcon(":/img/right.png"));
    ui->pushButton_right->setIconSize(QSize(40, 40));
}

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

void Widget::on_pushButton_up_clicked()
{
    QRect rect = ui->pushButton_target->geometry();
    ui->pushButton_target->setGeometry(rect.x(), rect.y() - 2, rect.width(), rect.height());
}

void Widget::on_pushButton_left_clicked()
{
    QRect rect = ui->pushButton_target->geometry();
    ui->pushButton_target->setGeometry(rect.x() - 2, rect.y(), rect.width(), rect.height());
}

void Widget::on_pushButton_right_clicked()
{
    QRect rect = ui->pushButton_target->geometry();
    ui->pushButton_target->setGeometry(rect.x() + 2, rect.y(), rect.width(), rect.height());
}

void Widget::on_pushButton_down_clicked()
{
    QRect rect = ui->pushButton_target->geometry();
    ui->pushButton_target->setGeometry(rect.x(), rect.y() + 2, rect.width(), rect.height());
}

现在是点击移动,设置快捷键:

// 在最后添加快捷键, 但点击信号的槽函数保留, 这样点击和快捷键都可用

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

    ui->pushButton_target->setIcon(QIcon(":/img/ztk.jpg"));
    ui->pushButton_target->setIconSize(QSize(70, 70));

    ui->pushButton_up->setIcon(QIcon(":/img/up.png"));
    ui->pushButton_up->setIconSize(QSize(40, 40));

    ui->pushButton_down->setIcon(QIcon(":/img/down.png"));
    ui->pushButton_down->setIconSize(QSize(40, 40));

    ui->pushButton_left->setIcon(QIcon(":/img/left.png"));
    ui->pushButton_left->setIconSize(QSize(40, 40));

    ui->pushButton_right->setIcon(QIcon(":/img/right.png"));
    ui->pushButton_right->setIconSize(QSize(40, 40));

    ui->pushButton_up->setShortcut(QKeySequence("w"));
    ui->pushButton_down->setShortcut(QKeySequence("s"));
    ui->pushButton_left->setShortcut(QKeySequence("a"));
    ui->pushButton_right->setShortcut(QKeySequence("d"));
}

另一种更准确的方法是用Qt给出的键位来设置,设置成方向键。写到Key_时会出现下拉框,里面有所有可用的键位。

    ui->pushButton_up->setShortcut(QKeySequence(Qt::Key_Up));
    ui->pushButton_down->setShortcut(QKeySequence(Qt::Key_Down));
    ui->pushButton_left->setShortcut(QKeySequence(Qt::Key_Left));
    ui->pushButton_right->setShortcut(QKeySequence(Qt::Key_Right));

如果两个都写,那就执行最新代码的,也就是方向键控制,而不是wasd:

    ui->pushButton_up->setShortcut(QKeySequence("w"));
    ui->pushButton_down->setShortcut(QKeySequence("s"));
    ui->pushButton_left->setShortcut(QKeySequence("a"));
    ui->pushButton_right->setShortcut(QKeySequence("d"));

    ui->pushButton_up->setShortcut(QKeySequence(Qt::Key_Up));
    ui->pushButton_down->setShortcut(QKeySequence(Qt::Key_Down));
    ui->pushButton_left->setShortcut(QKeySequence(Qt::Key_Left));
    ui->pushButton_right->setShortcut(QKeySequence(Qt::Key_Right));

连发:

    ui->pushButton_up->setAutoRepeat(true);
    ui->pushButton_down->setAutoRepeat(true);
    ui->pushButton_left->setAutoRepeat(true);
    ui->pushButton_right->setAutoRepeat(true);

2、QRadioButton

单选按钮

在这里插入图片描述

排他意思是只能选一个。做一个简单界面,上面为label,下面三个为radiobutton。

在这里插入图片描述

void Widget::on_radioButton_male_clicked()
{
    ui->label->setText("您选择的性别为: 男");
}

void Widget::on_radioButton_female_clicked()
{
    ui->label->setText("您选择的性别为: 女");
}

void Widget::on_radioButton_others_clicked()
{
    ui->label->setText("您选择的性别为: 其他");
}

设置一个默认显示

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

    ui->radioButton_others->setChecked(true);
    ui->label->setText("您选择的性别为: 其他");
}

让一个按钮

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

    ui->radioButton_others->setChecked(true);
    ui->label->setText("您选择的性别为: 其他");

    // Checkable让按钮不能被点击, 但是仍可以响应事件
    ui->radioButton_others->setCheckable(false);
    // Enabled则可以彻底绝除
    ui->radioButton_others->setDisabled(true);
    // or
    ui->radioButton_others->setEnabled(false);
}

彻底禁止后,按钮就变成灰色了。

1、带bool参数的槽函数和其它槽函数

在这里插入图片描述

void Widget::on_radioButton_1_clicked(bool checked)
{
    // checked表示了当前radioButton的选中状态
    qDebug() << "clicked: " << checked;
}

void Widget::on_radioButton_2_pressed()
{
    qDebug() << "pressed";
}

void Widget::on_radioButton_3_released()
{
    qDebug() << "released";
}

void Widget::on_radioButton_4_toggled(bool checked)
{
    // 表示切换
    // checked状态发生变化, 就触发这个信号
    qDebug() << "toggled: " << checked;
}

pressed表示鼠标一按下就触发,released表示鼠标按下并抬起后触发。

点击4按钮时会打印toggle: true,一直点击不会继续有反应,但是如果点击一下其它按钮,就会打印toggle: false。

2、点餐小程序

在这里插入图片描述

需要去掉排他属性,用QButtonGroup来对单选按钮进行分组

#include <QButtonGroup>

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

    QButtonGroup* g1 = new QButtonGroup(this);
    QButtonGroup* g2 = new QButtonGroup(this);
    QButtonGroup* g3 = new QButtonGroup(this);

    g1->addButton(ui->radioButton);
    g1->addButton(ui->radioButton_2);
    g1->addButton(ui->radioButton_3);

    g2->addButton(ui->radioButton_4);
    g2->addButton(ui->radioButton_5);
    g2->addButton(ui->radioButton_6);

    g3->addButton(ui->radioButton_7);
    g3->addButton(ui->radioButton_8);
}

3、QCheckBox

复选按钮,可以选多个。

在这里插入图片描述

void Widget::on_pushButton_clicked()
{
    QString res = "今日安排: ";
    if(ui->checkBox_study->isChecked())
        res += ui->checkBox_study->text() + " ";
    if(ui->checkBox_game->isChecked())
        res += ui->checkBox_game->text() + " ";
    if(ui->checkBox_play->isChecked())
        res += ui->checkBox_play->text() + " ";
    ui->label->setText(res);
}

结束。

;