Calculator.zip简易的计算器

#include <calculatordialog.h> CalculatorDialog::CalculatorDialog(QWidget *parent) : QDialog(parent) { bracket_cnt = 0; iniUI(); iniSignalSlots(); setWindowTitle("计算器"); } CalculatorDialog::~CalculatorDialog() { } void CalculatorDialog::iniUI() { historyEdit = new QPlainTextEdit(); historyEdit->setReadOnly(true); formulaEdit = new QLineEdit(); formulaEdit->setAlignment(Qt::AlignRight); // 设置显示字符串向右边对齐 formulaEdit->setReadOnly(true); // 设置对话框不能输入 resultEdit = new QLineEdit(); resultEdit->setAlignment(Qt::AlignRight); // 设置显示字符串向右边对齐 resultEdit->setReadOnly(true); // 设置对话框不能输入 bracketLeftBtn = new QPushButton(tr("(")); // 左括号 bracketRightBtn = new QPushButton(tr(")")); // 右括号 backspaceBtn = new QPushButton(tr("<-")); // 删除 clearBtn = new QPushButton(tr("C")); // 清除 QHBoxLayout *HLay1 = new QHBoxLayout; HLay1->addWidget(bracketLeftBtn); HLay1->addWidget(bracketRightBtn); HLay1->addWidget(backspaceBtn); HLay1->addWidget(clearBtn); num7Btn = new QPushButton(tr("7")); // 数字7 num8Btn = new QPushButton(tr("8")); // 数字8 num9Btn = new QPushButton(tr("9")); // 数字9 divisionBtn = new QPushButton(tr("/")); // 除号 QHBoxLayout *HLay2 = new QHBoxLayout; HLay2->addWidget(num7Btn); HLay2->addWidget(num8Btn); HLay2->addWidget(num9Btn); HLay2->addWidget(divisionBtn); num4Btn = new QPushButton(tr("4")); // 数字4 num5Btn = new QPushButton(tr("5")); // 数字5 num6Btn = new QPushButton(tr("6")); // 数字6 multiplicationBtn = new QPushButton(tr("*")); // 乘号 QHBoxLayout *HLay3 = new QHBoxLayout; HLay3->addWidget(num4Btn); HLay3->addWidget(num5Btn); HLay3->addWidget(num6Btn); HLay3->addWidget(multiplicationBtn); num1Btn = new QPushButton(tr("1")); // 数字1 num2Btn = new QPushButton(tr("2")); // 数字2 num3Btn = new QPushButton(tr("3")); // 数字3 minusBtn = new QPushButton(tr("-"));; // 减号 QHBoxLayout *HLay4 = new QHBoxLayout; HLay4->addWidget(num1Btn); HLay4->addWidget(num2Btn); HLay4->addWidget(num3Btn); HLay4->addWidget(minusBtn); num0Btn = new QPushButton(tr("0")); // 数字0 dotBtn = new QPushButton(tr(".")); // 小数点 equalsBtn = new QPushButton(tr("=")); // 等号 plusBtn = new QPushButton(tr("+")); // 加号 QHBoxLayout *HLay5 = new QHBoxLayout; HLay5->addWidget(num0Btn); HLay5->addWidget(dotBtn); HLay5->addWidget(equalsBtn); HLay5->addWidget(plusBtn); // 创建垂直布局，并设置为主布局 QVBoxLayout *VLay = new QVBoxLayout; VLay->addWidget(historyEdit); VLay->addWidget(formulaEdit); // VLay->addWidget(resultEdit); VLay->addLayout(HLay1); VLay->addLayout(HLay2); VLay->addLayout(HLay3); VLay->addLayout(HLay4); VLay->addLayout(HLay5); setLayout(VLay); } void CalculatorDialog::iniSignalSlots() { connect(bracketLeftBtn,SIGNAL(clicked()),this,SLOT(on_bracketLeftBtn())); connect(bracketRightBtn,SIGNAL(clicked()),this,SLOT(on_bracketRightBtn())); connect(backspaceBtn,SIGNAL(clicked()),this,SLOT(on_backspaceBtn())); connect(clearBtn,SIGNAL(clicked()),this,SLOT(on_clearBtn())); connect(num7Btn,SIGNAL(clicked()),this,SLOT(on_numBtn())); connect(num8Btn,SIGNAL(clicked()),this,SLOT(on_numBtn())); connect(num9Btn,SIGNAL(clicked()),this,SLOT(on_numBtn())); connect(divisionBtn,SIGNAL(clicked()),this,SLOT(on_divisionBtn())); connect(num4Btn,SIGNAL(clicked()),this,SLOT(on_numBtn())); connect(num5Btn,SIGNAL(clicked()),this,SLOT(on_numBtn())); connect(num6Btn,SIGNAL(clicked()),this,SLOT(on_numBtn())); connect(multiplicationBtn,SIGNAL(clicked()),this,SLOT(on_multiplicationBtn())); connect(num1Btn,SIGNAL(clicked()),this,SLOT(on_numBtn())); connect(num2Btn,SIGNAL(clicked()),this,SLOT(on_numBtn())); connect(num3Btn,SIGNAL(clicked()),this,SLOT(on_numBtn())); connect(minusBtn,SIGNAL(clicked()),this,SLOT(on_minusBtn())); connect(num0Btn,SIGNAL(clicked()),this,SLOT(on_numBtn())); connect(dotBtn,SIGNAL(clicked()),this,SLOT(on_dotBtn())); connect(equalsBtn,SIGNAL(clicked()),this,SLOT(on_equalsBtn())); connect(plusBtn,SIGNAL(clicked()),this,SLOT(on_plusBtn())); } void CalculatorDialog::on_numBtn() { QPushButton *btn = dynamic_cast<QPushButton *>(sender()); formulaStr.clear(); formulaStr = formulaEdit->text(); QString tmp = formulaStr.right(1); if (tmp.length() && tmp[0] == ')') { return; } formulaEdit->insert(btn->text()); } void CalculatorDialog::on_bracketLeftBtn() { formulaStr.clear(); formulaStr = formulaEdit->text(); QString tmp = formulaStr.right(1); if (tmp.length()) { //末尾是以下字符，不能输入左括号 if (MatchingBoth(tmp,")0123456789.") != -1) { return; } } tmp = formulaStr.right(2); if (tmp.length() == 2) { if (tmp[0] == '+' || tmp[0] == '-' || tmp[0] == '*' || tmp[0] == '/' || tmp[0] == '(') { if (tmp[1] == '+' || tmp[1] == '-' || tmp[1] == '*' || tmp[1] == '/') { return; } } } formulaEdit->insert("("); bracket_cnt++; } void CalculatorDialog::on_bracketRightBtn() { formulaStr.clear(); formulaStr = formulaEdit->text(); QString tmp = formulaStr.right(1); if (bracket_cnt == 0) { return; } if (tmp.length()) { //末尾是以下字符，不能输入右括号 if (MatchingBoth(tmp,"+-*/.(") != -1) { return; } } else { return; } formulaEdit->insert(")"); bracket_cnt--; } void CalculatorDialog::on_backspaceBtn() { if (formulaEdit->text() != "") { formulaEdit->backspace(); } } void CalculatorDialog::on_clearBtn() { if (formulaEdit->text() != "" || resultEdit->text() != "") { formulaStr.clear(); formulaEdit->clear(); resultEdit->clear(); } } void CalculatorDialog::on_divisionBtn() { formulaStr.clear(); formulaStr = formulaEdit->text(); QString tmp = formulaStr.right(1); if (tmp.length()) { //末尾是以下字符，不能插入除号 if (MatchingBoth(tmp,"(.+-*/") != -1) { return; } } else { return; } formulaEdit->insert("/"); } void CalculatorDialog::on_multiplicationBtn() { formulaStr.clear(); formulaStr = formulaEdit->text(); QString tmp = formulaStr.right(1); if (tmp.length()) { //末尾是以下字符，不能插入乘号 if (MatchingBoth(tmp,"(.+-*/") != -1) { return; } } else { return; } formulaEdit->insert("*"); } void CalculatorDialog::on_minusBtn() { formulaStr.clear(); formulaStr = formulaEdit->text(); QString tmp = formulaStr.right(1); if (tmp.length() && tmp[0] == '.') { return; } //末尾是以下字符，不能插入减号 tmp = formulaStr.right(2); if (tmp.length() == 2) { if (tmp[0] == '+' || tmp[0] == '-' || tmp[0] == '*' || tmp[0] == '/' || tmp[0] == '(') { if (tmp[1] == '+' || tmp[1] == '-' || tmp[1] == '*' || tmp[1] == '/') { return; } } } formulaEdit->insert("-"); } void CalculatorDialog::on_dotBtn() { formulaStr.clear(); formulaStr = formulaEdit->text(); QString tmp = formulaStr.right(1); if (tmp.length()) { //末尾是以下字符，可以插入点号