QT day2

1.在注册登录的训练里面，追加一个QListWidget 项目列表
要求：点击注册之后，将账号显示到 listWidget上面去
以及，在listWidget中双击某个账号的时候，将该账号删除

1. void Widget::on_pushButton_clicked()
2. {
3.     QString name = ui->lineEdit->text();
4.     if (ui->listWidget->findItems(name, Qt::MatchExactly).isEmpty())
5.     {
6.         ui->listWidget->addItem(name);
7.     }
8. }
10. void Widget::on_listWidget_itemDoubleClicked(QListWidgetItem *item)
11. {
12.     if (item)
13.     {
14.         ui->listWidget->takeItem(ui->listWidget->row(item));
15.         delete item;
16.     }
17. }

复制代码

运行效果：

双击删除

2.完成一个计算器，ui界面如下
完成 +-*/计算功能并且在对应位置显示对应的数据

widget.cpp

1. #include "widget.h"
2. #include "ui_widget.h"
4. Widget::Widget(QWidget *parent)
5.     : QWidget(parent)
6.     , ui(new Ui::Widget)
7. {
8.     ui->setupUi(this);
9. }
11. Widget::~Widget()
12. {
13.     delete ui;
14. }
17. void Widget::on_pushButton_0_clicked()
18. {
19. //    if (this->ui->lineEdit->text().isEmpty()){return;}
20. //    if (this->ui->lineEdit_2->text().isEmpty()){return;}
22.     if (this->ui->lineEdit_1->text().isEmpty())
23.     {
24.         num1 += "0";
25.         this->ui->lineEdit->setText(num1);
26.     }
27.     else
28.     {
29.         num2 += "0";
30.         this->ui->lineEdit_2->setText(num2);
31.     }
32. }
34. void Widget::on_pushButton_1_clicked()
35. {
36.     if (this->ui->lineEdit_1->text().isEmpty())
37.     {
38.         num1 += "1";
39.         this->ui->lineEdit->setText(num1);
40.     }
41.     else
42.     {
43.         num2 += "1";
44.         this->ui->lineEdit_2->setText(num2);
45.     }
46. }
48. void Widget::on_pushButton_2_clicked()
49. {
50.     if (this->ui->lineEdit_1->text().isEmpty())
51.     {
52.         num1 += "2";
53.         this->ui->lineEdit->setText(num1);
54.     }
55.     else
56.     {
57.         num2 += "2";
58.         this->ui->lineEdit_2->setText(num2);
59.     }
60. }
62. void Widget::on_pushButton_3_clicked()
63. {
66.     if (this->ui->lineEdit_1->text().isEmpty())
67.     {num1 += "3";
68.         this->ui->lineEdit->setText(num1);
69.     }
70.     else
71.     {num2 += "3";
72.         this->ui->lineEdit_2->setText(num2);
73.     }
74. }
76. void Widget::on_pushButton_4_clicked()
77. {
80.     if (this->ui->lineEdit_1->text().isEmpty())
81.     {num1 += "4";
82.         this->ui->lineEdit->setText(num1);
83.     }
84.     else
85.     {num2 += "4";
86.         this->ui->lineEdit_2->setText(num2);
87.     }
88. }
90. void Widget::on_pushButton_5_clicked()
91. {
94.     if (this->ui->lineEdit_1->text().isEmpty())
95.     {num1 += "5";
96.         this->ui->lineEdit->setText(num1);
97.     }
98.     else
99.     {num2 += "5";
100.         this->ui->lineEdit_2->setText(num2);
101.     }
102. }
104. void Widget::on_pushButton_6_clicked()
105. {
108.     if (this->ui->lineEdit_1->text().isEmpty())
109.     {num1 += "6";
110.         this->ui->lineEdit->setText(num1);
111.     }
112.     else
113.     {num2 += "6";
114.         this->ui->lineEdit_2->setText(num2);
115.     }
116. }
118. void Widget::on_pushButton_7_clicked()
119. {
122.     if (this->ui->lineEdit_1->text().isEmpty())
123.     {num1 += "7";
124.         this->ui->lineEdit->setText(num1);
125.     }
126.     else
127.     {num2 += "7";
128.         this->ui->lineEdit_2->setText(num2);
129.     }
130. }
132. void Widget::on_pushButton_8_clicked()
133. {
136.     if (this->ui->lineEdit_1->text().isEmpty())
137.     {num1 += "8";
138.         this->ui->lineEdit->setText(num1);
139.     }
140.     else
141.     {num2 += "8";
142.         this->ui->lineEdit_2->setText(num2);
143.     }
144. }
146. void Widget::on_pushButton_9_clicked()
147. {
150.     if (this->ui->lineEdit_1->text().isEmpty())
151.     {num1 += "9";
152.         this->ui->lineEdit->setText(num1);
153.     }
154.     else
155.     {num2 += "9";
156.         this->ui->lineEdit_2->setText(num2);
157.     }
158. }
160. void Widget::on_pushButton_10_clicked()
161. {
162.     ope = "+";
163.     this->ui->lineEdit_1->setText(ope);
164. }
166. void Widget::on_pushButton_11_clicked()
167. {
168.     ope = "-";
169.     this->ui->lineEdit_1->setText(ope);
170. }
172. void Widget::on_pushButton_12_clicked()
173. {
174.     ope = "×";
175.     this->ui->lineEdit_1->setText(ope);
176. }
178. void Widget::on_pushButton_13_clicked()
179. {
180.     ope = "➗";
181.     this->ui->lineEdit_1->setText(ope);
182. }
186. void Widget::on_pushButton_15_clicked()
187. {
188.     num1.clear();
189.     num2.clear();
190.     ui->lineEdit->setText("");
191.     ui->lineEdit_1->setText("");
192.     ui->lineEdit_2->setText("");
193.     ui->lineEdit_3->setText("");
194. }
196. void Widget::on_pushButton_14_clicked()
197. {
198.     bool b1, b2;
199.     double n1 = ui->lineEdit->text().toDouble(&b1);
200.     double n2 = ui->lineEdit_2->text().toDouble(&b2);
201.     if (ope == "+")
202.     {
203.         res = n1 + n2;
204.     }
205.     else if (ope == "-")
206.     {
207.         res = n1 - n2;
208.     }
209.     else if (ope == "×")
210.     {
211.         res = n1 * n2;
212.     }
213.     else if (ope == "➗")
214.     {
215.         if (n2 != 0)
216.         {
217.             res = n1 / n2;
218.         }
219.         else
220.         {
221.             ui->lineEdit_3->setText("除数不能为零");
222.             return;
223.         }
224.     }
226.     ui->lineEdit_3->setText(QString::number(res));
227. }

复制代码

widget.h

1. #ifndef WIDGET_H
2. #define WIDGET_H
4. #include <QWidget>
5. #include <QLineEdit>
6. #include <QPushButton>
8. QT_BEGIN_NAMESPACE
9. namespace Ui { class Widget; }
10. QT_END_NAMESPACE
12. class Widget : public QWidget
13. {
14.     Q_OBJECT
16. public:
17.     Widget(QWidget *parent = nullptr);
18.     ~Widget();
20. private slots:
21.     void on_pushButton_0_clicked();
23.     void on_pushButton_1_clicked();
25.     void on_pushButton_2_clicked();
27.     void on_pushButton_3_clicked();
29.     void on_pushButton_4_clicked();
31.     void on_pushButton_5_clicked();
33.     void on_pushButton_6_clicked();
35.     void on_pushButton_7_clicked();
37.     void on_pushButton_8_clicked();
39.     void on_pushButton_9_clicked();
41.     void on_pushButton_10_clicked();
43.     void on_pushButton_11_clicked();
45.     void on_pushButton_12_clicked();
47.     void on_pushButton_13_clicked();
49.     void on_pushButton_15_clicked();
51.     void on_pushButton_14_clicked();
53. private:
54.     Ui::Widget *ui;
55.     QString num1;
56.     QString num2;
57.     QString ope;
58.     double res;
60. };
61. #endif // WIDGET_H

复制代码

运行效果：

免责声明：如果侵犯了您的权益，请联系站长，我们会及时删除侵权内容，谢谢合作！更多信息从访问主页：qidao123.com:ToB企服之家，中国第一个企服评测及商务社交产业平台。