Qt——《开发指南》samp4.1源码分析

 1 #include "widget.h"
 2 #include <QApplication>
 3 
 4 int main(int argc, char *argv[])
 5 {
 6     QApplication a(argc, argv);
 7     Widget w;
 8     w.show();
 9 
10     return a.exec();
11 }

 1 #ifndef WIDGET_H
 2 #define WIDGET_H
 3 
 4 #include <QWidget>
 5 
 6 namespace Ui {
 7 class Widget;
 8 }
 9 
10 class Widget : public QWidget
11 {
12     Q_OBJECT
13 
14 public:
15     explicit Widget(QWidget *parent = 0);
16     ~Widget();
17 
18 private slots:
19     void on_btnCal_clicked();  //计算 按键单击响应
20 
21     void on_btnDec_clicked();   //十进制转换为其他进制
22 
23     void on_btnBin_clicked();   //二进制转换为其他进制
24 
25     void on_btnHex_clicked();   //十六进制转换为其他进制
26 
27 private:
28     Ui::Widget *ui;
29 };
30 
31 #endif // WIDGET_H

 1 #include "widget.h"
 2 #include "ui_widget.h"
 3 #include    <QString>
 4 
 5 Widget::Widget(QWidget *parent) :
 6     QWidget(parent),
 7     ui(new Ui::Widget)
 8 {
 9     ui->setupUi(this);
10 }
11 
12 Widget::~Widget()
13 {
14     delete ui;
15 }
16 
17 void Widget::on_btnCal_clicked()
18 { //计算 按键单击响应
19     int num=ui->editNum->text().toInt(); //读取字符串为整数
20     float price=ui->editPrice->text().toFloat();//读取字符串为浮点数
21 
22     float total=num*price;//相乘计算
23     QString str;
24 //    str=str.setNum(total,‘f‘,2); //浮点数2位小数
25     str=str.sprintf("%.2f",total); //格式化输出浮点数
26     ui->editTotal->setText(str);//在文本框里显示
27 }
28 
29 void Widget::on_btnDec_clicked()
30 { //读取十进制数，转换为其他进制
31     int val=ui->editDec->text().toInt();//读取十进制数
32     QString str=QString::number(val,16);// 显示为16进制 的字符串
33 
34     str=str.toUpper(); //转换为全大写字母
35     ui->editHex->setText(str);//显示16进制字符串
36 
37     str=QString::number(val,2);// 显示2进制的字符串
38     ui->editBin->setText(str);//显示二进制字符串
39 }
40 
41 void Widget::on_btnBin_clicked()
42 { //读取二进制数，转换为其他进制的数
43     bool ok;
44 
45     int val=ui->editBin->text().toInt(&ok,2);//以二进制数读入
46 
47     QString str=QString::number(val,10);//数字显示为10进制字符串
48     ui->editDec->setText(str);//显示10进制数字符串
49 
50     str=QString::number(val,16);//显示为十六进制字符串
51     str=str.toUpper(); //全大写字母
52     ui->editHex->setText(str);//显示十六进制字符串
53 }
54 
55 void Widget::on_btnHex_clicked()
56 {//读取16进制数，转换为其他进制的数
57     bool ok;
58 
59     int val=ui->editHex->text().toInt(&ok,16);//以十六进制数读入
60     QString str=QString::number(val,10);// 显示为10进制字符串
61     ui->editDec->setText(str);//显示为10进制字符串
62 
63     str=QString::number(val,2);// 显示二进制字符串
64     ui->editBin->setText(str);//显示二进制字符串
65 }

  1 #ifndef UI_WIDGET_H
  2 #define UI_WIDGET_H
  3 
  4 #include <QtCore/QVariant>
  5 #include <QtWidgets/QAction>
  6 #include <QtWidgets/QApplication>
  7 #include <QtWidgets/QButtonGroup>
  8 #include <QtWidgets/QGridLayout>
  9 #include <QtWidgets/QHeaderView>
 10 #include <QtWidgets/QLabel>
 11 #include <QtWidgets/QLineEdit>
 12 #include <QtWidgets/QPushButton>
 13 #include <QtWidgets/QSpacerItem>
 14 #include <QtWidgets/QVBoxLayout>
 15 #include <QtWidgets/QWidget>
 16 
 17 QT_BEGIN_NAMESPACE
 18 
 19 class Ui_Widget
 20 {
 21 public:
 22     QVBoxLayout *verticalLayout;
 23     QGridLayout *gridLayout;
 24     QLineEdit *editNum;
 25     QLineEdit *editTotal;
 26     QLabel *label_3;
 27     QPushButton *btnCal;
 28     QLabel *label;
 29     QSpacerItem *horizontalSpacer;
 30     QLineEdit *editPrice;
 31     QLabel *label_2;
 32     QSpacerItem *verticalSpacer;
 33     QGridLayout *gridLayout_2;
 34     QLabel *label_6;
 35     QLineEdit *editDec;
 36     QPushButton *btnDec;
 37     QLabel *label_7;
 38     QLineEdit *editBin;
 39     QPushButton *btnBin;
 40     QLabel *label_8;
 41     QLineEdit *editHex;
 42     QPushButton *btnHex;
 43 
 44     void setupUi(QWidget *Widget)
 45     {
 46         if (Widget->objectName().isEmpty())
 47             Widget->setObjectName(QStringLiteral("Widget"));
 48         Widget->resize(330, 189);
 49         QFont font;
 50         font.setFamily(QString::fromUtf8("\345\256\213\344\275\223"));
 51         font.setPointSize(10);
 52         Widget->setFont(font);
 53         verticalLayout = new QVBoxLayout(Widget);
 54         verticalLayout->setSpacing(6);
 55         verticalLayout->setContentsMargins(11, 11, 11, 11);
 56         verticalLayout->setObjectName(QStringLiteral("verticalLayout"));
 57         gridLayout = new QGridLayout();
 58         gridLayout->setSpacing(6);
 59         gridLayout->setObjectName(QStringLiteral("gridLayout"));
 60         editNum = new QLineEdit(Widget);
 61         editNum->setObjectName(QStringLiteral("editNum"));
 62 
 63         gridLayout->addWidget(editNum, 0, 1, 1, 1);
 64 
 65         editTotal = new QLineEdit(Widget);
 66         editTotal->setObjectName(QStringLiteral("editTotal"));
 67 
 68         gridLayout->addWidget(editTotal, 1, 4, 1, 1);
 69 
 70         label_3 = new QLabel(Widget);
 71         label_3->setObjectName(QStringLiteral("label_3"));
 72 
 73         gridLayout->addWidget(label_3, 1, 3, 1, 1);
 74 
 75         btnCal = new QPushButton(Widget);
 76         btnCal->setObjectName(QStringLiteral("btnCal"));
 77 
 78         gridLayout->addWidget(btnCal, 1, 1, 1, 1);
 79 
 80         label = new QLabel(Widget);
 81         label->setObjectName(QStringLiteral("label"));
 82 
 83         gridLayout->addWidget(label, 0, 0, 1, 1);
 84 
 85         horizontalSpacer = new QSpacerItem(40, 20, QSizePolicy::Expanding, QSizePolicy::Minimum);
 86 
 87         gridLayout->addItem(horizontalSpacer, 1, 2, 1, 1);
 88 
 89         editPrice = new QLineEdit(Widget);
 90         editPrice->setObjectName(QStringLiteral("editPrice"));
 91 
 92         gridLayout->addWidget(editPrice, 0, 4, 1, 1);
 93 
 94         label_2 = new QLabel(Widget);
 95         label_2->setObjectName(QStringLiteral("label_2"));
 96 
 97         gridLayout->addWidget(label_2, 0, 3, 1, 1);
 98 
 99 
100         verticalLayout->addLayout(gridLayout);
101 
102         verticalSpacer = new QSpacerItem(20, 40, QSizePolicy::Minimum, QSizePolicy::Expanding);
103 
104         verticalLayout->addItem(verticalSpacer);
105 
106         gridLayout_2 = new QGridLayout();
107         gridLayout_2->setSpacing(6);
108         gridLayout_2->setObjectName(QStringLiteral("gridLayout_2"));
109         label_6 = new QLabel(Widget);
110         label_6->setObjectName(QStringLiteral("label_6"));
111 
112         gridLayout_2->addWidget(label_6, 0, 0, 1, 1);
113 
114         editDec = new QLineEdit(Widget);
115         editDec->setObjectName(QStringLiteral("editDec"));
116 
117         gridLayout_2->addWidget(editDec, 0, 1, 1, 1);
118 
119         btnDec = new QPushButton(Widget);
120         btnDec->setObjectName(QStringLiteral("btnDec"));
121 
122         gridLayout_2->addWidget(btnDec, 0, 2, 1, 1);
123 
124         label_7 = new QLabel(Widget);
125         label_7->setObjectName(QStringLiteral("label_7"));
126 
127         gridLayout_2->addWidget(label_7, 1, 0, 1, 1);
128 
129         editBin = new QLineEdit(Widget);
130         editBin->setObjectName(QStringLiteral("editBin"));
131 
132         gridLayout_2->addWidget(editBin, 1, 1, 1, 1);
133 
134         btnBin = new QPushButton(Widget);
135         btnBin->setObjectName(QStringLiteral("btnBin"));
136 
137         gridLayout_2->addWidget(btnBin, 1, 2, 1, 1);
138 
139         label_8 = new QLabel(Widget);
140         label_8->setObjectName(QStringLiteral("label_8"));
141 
142         gridLayout_2->addWidget(label_8, 2, 0, 1, 1);
143 
144         editHex = new QLineEdit(Widget);
145         editHex->setObjectName(QStringLiteral("editHex"));
146 
147         gridLayout_2->addWidget(editHex, 2, 1, 1, 1);
148 
149         btnHex = new QPushButton(Widget);
150         btnHex->setObjectName(QStringLiteral("btnHex"));
151 
152         gridLayout_2->addWidget(btnHex, 2, 2, 1, 1);
153 
154 
155         verticalLayout->addLayout(gridLayout_2);
156 
157 
158         retranslateUi(Widget);
159 
160         QMetaObject::connectSlotsByName(Widget);
161     } // setupUi
162 
163     void retranslateUi(QWidget *Widget)
164     {
165         Widget->setWindowTitle(QApplication::translate("Widget", "\345\255\227\347\254\246\344\270\262\344\270\216\350\276\223\345\205\245\350\276\223\345\207\272", Q_NULLPTR));
166         editNum->setText(QApplication::translate("Widget", "12", Q_NULLPTR));
167         label_3->setText(QApplication::translate("Widget", "\346\200\273 \344\273\267", Q_NULLPTR));
168         btnCal->setText(QApplication::translate("Widget", "\350\256\241\347\256\227", Q_NULLPTR));
169         label->setText(QApplication::translate("Widget", "\346\225\260 \351\207\217", Q_NULLPTR));
170         editPrice->setText(QApplication::translate("Widget", "5.3", Q_NULLPTR));
171         label_2->setText(QApplication::translate("Widget", "\345\215\225 \344\273\267", Q_NULLPTR));
172         label_6->setText(QApplication::translate("Widget", "\345\215\201 \350\277\233 \345\210\266", Q_NULLPTR));
173         editDec->setInputMask(QString());
174         editDec->setText(QApplication::translate("Widget", "12", Q_NULLPTR));
175         btnDec->setText(QApplication::translate("Widget", "\350\275\254\346\215\242\344\270\272\345\205\266\344\273\226\350\277\233\345\210\266", Q_NULLPTR));
176         label_7->setText(QApplication::translate("Widget", "\344\272\214 \350\277\233 \345\210\266", Q_NULLPTR));
177         editBin->setInputMask(QString());
178         btnBin->setText(QApplication::translate("Widget", "\350\275\254\346\215\242\344\270\272\345\205\266\344\273\226\350\277\233\345\210\266", Q_NULLPTR));
179         label_8->setText(QApplication::translate("Widget", "\345\215\201\345\205\255\350\277\233\345\210\266", Q_NULLPTR));
180         editHex->setInputMask(QString());
181         btnHex->setText(QApplication::translate("Widget", "\350\275\254\346\215\242\344\270\272\345\205\266\344\273\226\350\277\233\345\210\266", Q_NULLPTR));
182     } // retranslateUi
183 
184 };
185 
186 namespace Ui {
187     class Widget: public Ui_Widget {};
188 } // namespace Ui
189 
190 QT_END_NAMESPACE
191 
192 #endif // UI_WIDGET_H