void caculator::createMainWidget()
{ //set show edit property
lineEdit = new QLineEdit(tr("0."));
lineEdit->setFixedSize(246, 27);
lineEdit->setAlignment(Qt::AlignRight);
lineEdit->setMaxLength(19);
lineEdit->setReadOnly(true);
/*
*QTextEdit设置 setEnable(false)后滚动框出现但滚动条消失，无法滚动。如果是想不让其中的内容被人为修改，应该用setReadOnly(true);来代替。
*/
QFont font = lineEdit->font();
font.setPointSize(font.pointSize() + 8);
lineEdit->setFont(font);
//set second line widget
emptyButton = new QPushButton(tr(""));
emptyButton->setFixedSize(35, 25);
emptyButton->setEnabled(false);
//set color of palette
QPalette palRed;
palRed.setColor(QPalette::ButtonText,QColor(255, 0, 0));
QPalette palBlue;
palBlue.setColor(QPalette::ButtonText,QColor(0, 0, 255));
backSpaceButton = new QPushButton(tr("Backspace"));
backSpaceButton->setFixedSize(65, 25);
backSpaceButton->setPalette(palRed);
connect(backSpaceButton, SIGNAL(clicked()),
this, SLOT(on_backSpaceButton()));
ceButton = new QPushButton(tr("CE"));
ceButton->setFixedSize(65, 25);
ceButton->setPalette(palRed);
connect(ceButton, SIGNAL(clicked()),
this, SLOT(on_ceButton()));
cButton = new QPushButton(tr("C"));
cButton->setFixedSize(65, 25);
cButton->setPalette(palRed);
connect(cButton, SIGNAL(clicked()),
this, SLOT(on_cButton()));
QHBoxLayout *secondLayout = new QHBoxLayout;
secondLayout->addWidget(emptyButton);
secondLayout->addWidget(backSpaceButton);
secondLayout->addWidget(ceButton);
secondLayout->addWidget(cButton);
//set third line widget
mcButton = new QPushButton(tr("MC"));
mcButton->setFixedSize(35, 25);
mcButton->setPalette(palRed);
connect(mcButton, SIGNAL(clicked()),
this, SLOT(on_mcButton()));
sevenButton = new QPushButton(tr("7"));
sevenButton->setFixedSize(35, 25);
sevenButton->setPalette(palBlue);
sevenButton->setShortcut(tr("7")); //bind number 7 key
connect(sevenButton, SIGNAL(clicked()),
this, SLOT(on_sevenButton()));
eightButton = new QPushButton(tr("8"));
eightButton->setFixedSize(35, 25);
eightButton->setPalette(palBlue);
eightButton->setShortcut(tr("8"));
connect(eightButton, SIGNAL(clicked()),
this, SLOT(on_eightButton()));
nineButton = new QPushButton(tr("9"));
nineButton->setFixedSize(35, 25);
nineButton->setPalette(palBlue);
nineButton->setShortcut(tr("9"));
connect(nineButton, SIGNAL(clicked()),
this, SLOT(on_nineButton()));
divideButton = new QPushButton(tr("/"));
divideButton->setFixedSize(35, 25);
divideButton->setPalette(palRed);
divideButton->setShortcut(tr("/"));
connect(divideButton, SIGNAL(clicked()),
this, SLOT(on_divideButton()));
sqrtButton = new QPushButton(tr("sqrt"));
sqrtButton->setFixedSize(35, 25);
sqrtButton->setPalette(palBlue);
connect(sqrtButton, SIGNAL(clicked()),
this, SLOT(on_sqrtButton()));
QHBoxLayout *thirdLayout = new QHBoxLayout;
thirdLayout->addWidget(mcButton);
thirdLayout->addWidget(sevenButton);
thirdLayout->addWidget(eightButton);
thirdLayout->addWidget(nineButton);
thirdLayout->addWidget(divideButton);
thirdLayout->addWidget(sqrtButton);
//set fourth line widget
mrButton = new QPushButton(tr("MR"));
mrButton->setFixedSize(35, 25);
mrButton->setPalette(palRed);
connect(mrButton, SIGNAL(clicked()),
this, SLOT(on_mrButton()));
fourButton = new QPushButton(tr("4"));
fourButton->setFixedSize(35, 25);
fourButton->setPalette(palBlue);
fourButton->setShortcut(tr("4"));
connect(fourButton, SIGNAL(clicked()),
this, SLOT(on_fourButton()));
fiveButton = new QPushButton(tr("5"));
fiveButton->setFixedSize(35, 25);
fiveButton->setPalette(palBlue);
fiveButton->setShortcut(tr("5"));
connect(fiveButton, SIGNAL(clicked()),
this, SLOT(on_fiveButton()));
sixButton = new QPushButton(tr("6"));
sixButton->setFixedSize(35, 25);
sixButton->setPalette(palBlue);
sixButton->setShortcut(tr("6"));
connect(sixButton, SIGNAL(clicked()),
this, SLOT(on_sixButton()));
multipButton = new QPushButton(tr("*"));
multipButton->setFixedSize(35, 25);
multipButton->setPalette(palRed);
multipButton->setShortcut(tr("*"));
connect(multipButton, SIGNAL(clicked()),
this, SLOT(on_multipButton()));
modButton = new QPushButton(tr("%"));
modButton->setFixedSize(35, 25);
modButton->setPalette(palBlue);
connect(modButton, SIGNAL(clicked()),
this, SLOT(on_modButton()));
QHBoxLayout *fourLayout = new QHBoxLayout;
fourLayout->addWidget(mrButton);
fourLayout->addWidget(fourButton);
fourLayout->addWidget(fiveButton);
fourLayout->addWidget(sixButton);
fourLayout->addWidget(multipButton);
fourLayout->addWidget(modButton);
//set five line widget
msButton = new QPushButton(tr("MS"));
msButton->setFixedSize(35, 25);
msButton->setPalette(palRed);
connect(msButton, SIGNAL(clicked()),
this, SLOT(on_msButton()));
oneButton = new QPushButton(tr("1"));
oneButton->setFixedSize(35, 25);
oneButton->setPalette(palBlue);
oneButton->setShortcut(tr("1"));
connect(oneButton, SIGNAL(clicked()),
this, SLOT(on_oneButton()));
twoButton = new QPushButton(tr("2"));
twoButton->setFixedSize(35, 25);
twoButton->setPalette(palBlue);
twoButton->setShortcut(tr("2"));
connect(twoButton, SIGNAL(clicked()),
this, SLOT(on_twoButton()));
threeButton = new QPushButton(tr("3"));
threeButton->setFixedSize(35, 25);
threeButton->setPalette(palBlue);
threeButton->setShortcut(tr("3"));
connect(threeButton, SIGNAL(clicked()),
this, SLOT(on_threeButton()));
subButton = new QPushButton(tr("-"));
subButton->setFixedSize(35, 25);
subButton->setPalette(palRed);
subButton->setShortcut(tr("-"));
connect(subButton, SIGNAL(clicked()),
this, SLOT(on_subButton()));
recipButton = new QPushButton(tr("1/x"));
recipButton->setFixedSize(35, 25);
recipButton->setPalette(palBlue);
connect(recipButton, SIGNAL(clicked()),
this, SLOT(on_recipButton()));
QHBoxLayout *fiveLayout = new QHBoxLayout;
fiveLayout->addWidget(msButton);
fiveLayout->addWidget(oneButton);
fiveLayout->addWidget(twoButton);
fiveLayout->addWidget(threeButton);
fiveLayout->addWidget(subButton);
fiveLayout->addWidget(recipButton);
//set sixth line widget
mPlusButton = new QPushButton(tr("M+"));
mPlusButton->setFixedSize(35, 25);
mPlusButton->setPalette(palRed);
connect(mPlusButton, SIGNAL(clicked()),
this, SLOT(on_mPlusButton()));
zeroButton = new QPushButton(tr("0"));
zeroButton->setFixedSize(35, 25);
zeroButton->setPalette(palBlue);
zeroButton->setShortcut(tr("0"));
connect(zeroButton, SIGNAL(clicked()),
this, SLOT(on_zeroButton()));
signButton = new QPushButton(tr("+/-"));
signButton->setFixedSize(35, 25);
signButton->setPalette(palBlue);
connect(signButton, SIGNAL(clicked()),
this, SLOT(on_signButton()));
dotButton = new QPushButton(tr("."));
dotButton->setFixedSize(35, 25);
dotButton->setPalette(palBlue);
dotButton->setShortcut(tr("."));
connect(dotButton, SIGNAL(clicked()),
this, SLOT(on_dotButton()));
plusButton = new QPushButton(tr("+"));
plusButton->setFixedSize(35, 25);
plusButton->setPalette(palRed);
plusButton->setShortcut(tr("+"));
connect(plusButton, SIGNAL(clicked()),
this, SLOT(on_plusButton()));
equalButton = new QPushButton(tr("="));
equalButton->setFixedSize(35, 25);
equalButton->setPalette(palRed);
equalButton->setShortcut(tr("Enter"));
connect(equalButton, SIGNAL(clicked()),
this, SLOT(on_equalButton()));
QHBoxLayout *sixLayout = new QHBoxLayout;
sixLayout->addWidget(mPlusButton);
sixLayout->addWidget(zeroButton);
sixLayout->addWidget(signButton);
sixLayout->addWidget(dotButton);
sixLayout->addWidget(plusButton);
sixLayout->addWidget(equalButton);
//main layout
QVBoxLayout *mainLayout = new QVBoxLayout;
mainLayout->addWidget(lineEdit);
mainLayout->addLayout(secondLayout);
mainLayout->addLayout(thirdLayout);
mainLayout->addLayout(fourLayout);
mainLayout->addLayout(fiveLayout);
mainLayout->addLayout(sixLayout);
mainWidget->setLayout(mainLayout);
}
void caculator::on_plusButton()
{
on_equalButton();
caculSign = '+';
}
void caculator::on_subButton()
{
on_equalButton();
caculSign = '-';
}
void caculator::on_multipButton()
{
on_equalButton();
caculSign = '*';
}
void caculator::on_divideButton()
{
on_equalButton();
caculSign = '/';
}
void Caculator::on_subButton()
{
on_equalButton();
caculToNum = '-';
}
