实现简单的计算器（设计UI）

要点说明：

1、一个textedit控件，其余全部是button控件，button布局方式：栅格布局（Grid layout）

2、对窗体的Title进行修改（默认是工程名）

3、在ui文件中设计的UI，编译器会自动创建一个类，在这个类的创建依据就是在用户自定义的类中说明的：

通过ctrl+鼠标左键可以查看生成的类的详细情况：

  1 /********************************************************************************
  2 ** Form generated from reading UI file 'dialog.ui'
  3 **
  4 ** Created by: Qt User Interface Compiler version 5.12.3
  5 **
  6 ** WARNING! All changes made in this file will be lost when recompiling UI file!
  7 ********************************************************************************/
  8 
  9 #ifndef UI_DIALOG_H
 10 #define UI_DIALOG_H
 11 
 12 #include <QtCore/QVariant>
 13 #include <QtWidgets/QApplication>
 14 #include <QtWidgets/QDialog>
 15 #include <QtWidgets/QGridLayout>
 16 #include <QtWidgets/QLabel>
 17 #include <QtWidgets/QPushButton>
 18 #include <QtWidgets/QVBoxLayout>
 19 
 20 QT_BEGIN_NAMESPACE
 21 
 22 class Ui_Dialog
 23 {
 24 public:
 25     QVBoxLayout *verticalLayout;
 26     QLabel *lab_display;
 27     QGridLayout *gridLayout;
 28     QPushButton *btn_7;
 29     QPushButton *btn_8;
 30     QPushButton *btn_9;
 31     QPushButton *btn_add;
 32     QPushButton *btn_4;
 33     QPushButton *btn_5;
 34     QPushButton *btn_6;
 35     QPushButton *btn_dec;
 36     QPushButton *btn_1;
 37     QPushButton *btn_2;
 38     QPushButton *btn_3;
 39     QPushButton *btn_mult;
 40     QPushButton *btn_c;
 41     QPushButton *btn_0;
 42     QPushButton *btn_eq;
 43     QPushButton *btn_div;
 44 
 45     void setupUi(QDialog *Dialog)
 46     {
 47         if (Dialog->objectName().isEmpty())
 48             Dialog->setObjectName(QString::fromUtf8("Dialog"));
 49         Dialog->resize(338, 334);
 50         verticalLayout = new QVBoxLayout(Dialog);
 51         verticalLayout->setSpacing(6);
 52         verticalLayout->setContentsMargins(11, 11, 11, 11);
 53         verticalLayout->setObjectName(QString::fromUtf8("verticalLayout"));
 54         lab_display = new QLabel(Dialog);
 55         lab_display->setObjectName(QString::fromUtf8("lab_display"));
 56         lab_display->setStyleSheet(QString::fromUtf8("font: 24pt "Algerian";
"
 57 "background-color: rgb(190, 190, 255);"));
 58         lab_display->setAlignment(Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter);
 59 
 60         verticalLayout->addWidget(lab_display);
 61 
 62         gridLayout = new QGridLayout();
 63         gridLayout->setSpacing(6);
 64         gridLayout->setObjectName(QString::fromUtf8("gridLayout"));
 65         btn_7 = new QPushButton(Dialog);
 66         btn_7->setObjectName(QString::fromUtf8("btn_7"));
 67         QSizePolicy sizePolicy(QSizePolicy::Minimum, QSizePolicy::Expanding);
 68         sizePolicy.setHorizontalStretch(0);
 69         sizePolicy.setVerticalStretch(0);
 70         sizePolicy.setHeightForWidth(btn_7->sizePolicy().hasHeightForWidth());
 71         btn_7->setSizePolicy(sizePolicy);
 72 
 73         gridLayout->addWidget(btn_7, 0, 0, 1, 1);
 74 
 75         btn_8 = new QPushButton(Dialog);
 76         btn_8->setObjectName(QString::fromUtf8("btn_8"));
 77         sizePolicy.setHeightForWidth(btn_8->sizePolicy().hasHeightForWidth());
 78         btn_8->setSizePolicy(sizePolicy);
 79 
 80         gridLayout->addWidget(btn_8, 0, 1, 1, 1);
 81 
 82         btn_9 = new QPushButton(Dialog);
 83         btn_9->setObjectName(QString::fromUtf8("btn_9"));
 84         sizePolicy.setHeightForWidth(btn_9->sizePolicy().hasHeightForWidth());
 85         btn_9->setSizePolicy(sizePolicy);
 86 
 87         gridLayout->addWidget(btn_9, 0, 2, 1, 1);
 88 
 89         btn_add = new QPushButton(Dialog);
 90         btn_add->setObjectName(QString::fromUtf8("btn_add"));
 91         sizePolicy.setHeightForWidth(btn_add->sizePolicy().hasHeightForWidth());
 92         btn_add->setSizePolicy(sizePolicy);
 93 
 94         gridLayout->addWidget(btn_add, 0, 3, 1, 1);
 95 
 96         btn_4 = new QPushButton(Dialog);
 97         btn_4->setObjectName(QString::fromUtf8("btn_4"));
 98         sizePolicy.setHeightForWidth(btn_4->sizePolicy().hasHeightForWidth());
 99         btn_4->setSizePolicy(sizePolicy);
100 
101         gridLayout->addWidget(btn_4, 1, 0, 1, 1);
102 
103         btn_5 = new QPushButton(Dialog);
104         btn_5->setObjectName(QString::fromUtf8("btn_5"));
105         sizePolicy.setHeightForWidth(btn_5->sizePolicy().hasHeightForWidth());
106         btn_5->setSizePolicy(sizePolicy);
107 
108         gridLayout->addWidget(btn_5, 1, 1, 1, 1);
109 
110         btn_6 = new QPushButton(Dialog);
111         btn_6->setObjectName(QString::fromUtf8("btn_6"));
112         sizePolicy.setHeightForWidth(btn_6->sizePolicy().hasHeightForWidth());
113         btn_6->setSizePolicy(sizePolicy);
114 
115         gridLayout->addWidget(btn_6, 1, 2, 1, 1);
116 
117         btn_dec = new QPushButton(Dialog);
118         btn_dec->setObjectName(QString::fromUtf8("btn_dec"));
119         sizePolicy.setHeightForWidth(btn_dec->sizePolicy().hasHeightForWidth());
120         btn_dec->setSizePolicy(sizePolicy);
121 
122         gridLayout->addWidget(btn_dec, 1, 3, 1, 1);
123 
124         btn_1 = new QPushButton(Dialog);
125         btn_1->setObjectName(QString::fromUtf8("btn_1"));
126         sizePolicy.setHeightForWidth(btn_1->sizePolicy().hasHeightForWidth());
127         btn_1->setSizePolicy(sizePolicy);
128 
129         gridLayout->addWidget(btn_1, 2, 0, 1, 1);
130 
131         btn_2 = new QPushButton(Dialog);
132         btn_2->setObjectName(QString::fromUtf8("btn_2"));
133         sizePolicy.setHeightForWidth(btn_2->sizePolicy().hasHeightForWidth());
134         btn_2->setSizePolicy(sizePolicy);
135 
136         gridLayout->addWidget(btn_2, 2, 1, 1, 1);
137 
138         btn_3 = new QPushButton(Dialog);
139         btn_3->setObjectName(QString::fromUtf8("btn_3"));
140         sizePolicy.setHeightForWidth(btn_3->sizePolicy().hasHeightForWidth());
141         btn_3->setSizePolicy(sizePolicy);
142 
143         gridLayout->addWidget(btn_3, 2, 2, 1, 1);
144 
145         btn_mult = new QPushButton(Dialog);
146         btn_mult->setObjectName(QString::fromUtf8("btn_mult"));
147         sizePolicy.setHeightForWidth(btn_mult->sizePolicy().hasHeightForWidth());
148         btn_mult->setSizePolicy(sizePolicy);
149 
150         gridLayout->addWidget(btn_mult, 2, 3, 1, 1);
151 
152         btn_c = new QPushButton(Dialog);
153         btn_c->setObjectName(QString::fromUtf8("btn_c"));
154         sizePolicy.setHeightForWidth(btn_c->sizePolicy().hasHeightForWidth());
155         btn_c->setSizePolicy(sizePolicy);
156 
157         gridLayout->addWidget(btn_c, 3, 0, 1, 1);
158 
159         btn_0 = new QPushButton(Dialog);
160         btn_0->setObjectName(QString::fromUtf8("btn_0"));
161         sizePolicy.setHeightForWidth(btn_0->sizePolicy().hasHeightForWidth());
162         btn_0->setSizePolicy(sizePolicy);
163 
164         gridLayout->addWidget(btn_0, 3, 1, 1, 1);
165 
166         btn_eq = new QPushButton(Dialog);
167         btn_eq->setObjectName(QString::fromUtf8("btn_eq"));
168         sizePolicy.setHeightForWidth(btn_eq->sizePolicy().hasHeightForWidth());
169         btn_eq->setSizePolicy(sizePolicy);
170 
171         gridLayout->addWidget(btn_eq, 3, 2, 1, 1);
172 
173         btn_div = new QPushButton(Dialog);
174         btn_div->setObjectName(QString::fromUtf8("btn_div"));
175         sizePolicy.setHeightForWidth(btn_div->sizePolicy().hasHeightForWidth());
176         btn_div->setSizePolicy(sizePolicy);
177 
178         gridLayout->addWidget(btn_div, 3, 3, 1, 1);
179 
180 
181         verticalLayout->addLayout(gridLayout);
182 
183         verticalLayout->setStretch(0, 2);
184         verticalLayout->setStretch(1, 8);
185 
186         retranslateUi(Dialog);
187 
188         QMetaObject::connectSlotsByName(Dialog);
189     } // setupUi
190 
191     void retranslateUi(QDialog *Dialog)
192     {
193         Dialog->setWindowTitle(QApplication::translate("Dialog", "350256241347256227345231250", nullptr));
194         lab_display->setText(QApplication::translate("Dialog", "0", nullptr));
195         btn_7->setText(QApplication::translate("Dialog", "7", nullptr));
196         btn_8->setText(QApplication::translate("Dialog", "8", nullptr));
197         btn_9->setText(QApplication::translate("Dialog", "9", nullptr));
198         btn_add->setText(QApplication::translate("Dialog", "+", nullptr));
199         btn_4->setText(QApplication::translate("Dialog", "4", nullptr));
200         btn_5->setText(QApplication::translate("Dialog", "5", nullptr));
201         btn_6->setText(QApplication::translate("Dialog", "6", nullptr));
202         btn_dec->setText(QApplication::translate("Dialog", "-", nullptr));
203         btn_1->setText(QApplication::translate("Dialog", "1", nullptr));
204         btn_2->setText(QApplication::translate("Dialog", "2", nullptr));
205         btn_3->setText(QApplication::translate("Dialog", "3", nullptr));
206         btn_mult->setText(QApplication::translate("Dialog", "*", nullptr));
207         btn_c->setText(QApplication::translate("Dialog", "C", nullptr));
208         btn_0->setText(QApplication::translate("Dialog", "0", nullptr));
209         btn_eq->setText(QApplication::translate("Dialog", "=", nullptr));
210         btn_div->setText(QApplication::translate("Dialog", "/", nullptr));
211     } // retranslateUi
212 
213 };
214 
215 namespace Ui {
216     class Dialog: public Ui_Dialog {};
217 } // namespace Ui
218 
219 QT_END_NAMESPACE
220 
221 #endif // UI_DIALOG_H
内在的趣味，表面的繁琐
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原文地址：https://www.cnblogs.com/data1213/p/10800527.html