Qt之QCheckBox

构造一个复选框QCheckBox，然后使用setTristate()开启三态模式。

QCheckBox *pCheckBox = new QCheckBox(this);

m_pLabel = new QLabel(this);

m_pLabel->setText(“Click CheckBox…”);

pCheckBox->setText(QString::fromLocal8Bit(“三态复选框”));

// 开启三态模式

pCheckBox->setTristate();

// 连接信号槽

connect(pCheckBox, SIGNAL(stateChanged(int)), this, SLOT(onStateChanged(int)));

槽函数，判断当前复选框状态，其中包括：选中（Qt::Checked）、半选（Qt::PartiallyChecked）、未选中（Qt::Unchecked）。

void MainWindow::onStateChanged(int state)

{

if (state == Qt::Checked) // “选中”

{

m_pLabel->setText(“Checked”);

}

else if(state == Qt::PartiallyChecked) // “半选”

{

m_pLabel->setText(“PartiallyChecked”);

}

else // 未选中 – Qt::Unchecked

{

m_pLabel->setText(“Unchecked”);

}

}

QSS复选框样式。

QCheckBox{

spacing: 5px;

color: white;

}

QCheckBox::indicator {

width: 17px;

height: 17px;

}

QCheckBox::indicator:enabled:unchecked {

image: url(:/Images/checkBox);

}

QCheckBox::indicator:enabled:unchecked:hover {

image: url(:/Images/checkBoxHover);

}

QCheckBox::indicator:enabled:unchecked:pressed {

image: url(:/Images/checkBoxPressed);

}

QCheckBox::indicator:enabled:checked {

image: url(:/Images/checkBoxChecked);

}

QCheckBox::indicator:enabled:checked:hover {

image: url(:/Images/checkBoxCheckedHover);

}

QCheckBox::indicator:enabled:checked:pressed {

image: url(:/Images/checkBoxCheckedPressed);

}

QCheckBox::indicator:enabled:indeterminate {

image: url(:/Images/checkBoxIndeterminate);

}

QCheckBox::indicator:enabled:indeterminate:hover {

image: url(:/Images/checkBoxIndeterminateHover);

}

QCheckBox::indicator:enabled:indeterminate:pressed {

image: url(:/Images/checkBoxIndeterminatePressed);

}

连接stateChanged()信号和槽函数，当用户点击复选框时，状态发生改变就会调用槽函数。

根据以上样式可写为：

AirFrame QCheckBox#switch_Button::indicator:unchecked

{

image: url(://resource/area/checkbox/close.png);

}

AirFrame QCheckBox#switch_Button::indicator:checked

{

image: url(://resource/area/checkbox/open.png);

}

以上是更改使用的。