购物小程序开发公司_现在学软件前景怎么样_站点推广是什么意思_网店推广有哪些方法

实现这个效果，需要重写`paintSection`来实现效果，同时重写`mousePressEvent`来执行是否勾选复选框。

paintSection实现一些复选框样式

void CheckBoxHeaderView::paintSection(QPainter *painter, const QRect &rect, int logicalIndex) const
{if (m_logicalIndex.contains(logicalIndex)){painter->save();QHeaderView::paintSection(painter, rect, logicalIndex);painter->restore();QStyleOptionButton checkBoxOption;QRect checkBoxRect = style()->subElementRect(QStyle::SE_CheckBoxIndicator, &checkBoxOption);checkBoxOption.rect = rect;checkBoxOption.rect.setLeft(rect.left() + (rect.width() - checkBoxRect.width()) / 2);checkBoxOption.rect.setTop(rect.top() + (rect.height() - checkBoxRect.height()) / 2);checkBoxOption.state = m_logicalIndex.value(logicalIndex) ? QStyle::State_On :QStyle::State_Off;checkBoxOption.state |= QStyle::State_Enabled;QCheckBox checkBox;checkBox.setStyleSheet(m_strStyleSheet);checkBox.style()->drawControl(QStyle::CE_CheckBox, &checkBoxOption, painter, &checkBox);//style()->drawPrimitive(QStyle::PE_IndicatorCheckBox, &checkBoxOption, painter,&checkBox);}else{QHeaderView::paintSection(painter, rect, logicalIndex);}
}

或者通过QWidget的render()来实现

void CheckBoxHeaderView::paintSection(QPainter *painter, const QRect &rect, int logicalIndex) const
{if (m_logicalIndex.contains(logicalIndex)){painter->save();QHeaderView::paintSection(painter, rect, logicalIndex);painter->restore();QStyleOptionButton checkBoxOption;QRect checkBoxRect = style()->subElementRect(QStyle::SE_CheckBoxIndicator, &checkBoxOption);int x = rect.left() + (rect.width() - checkBoxRect.width()) / 2;int y = rect.top() + (rect.height() - checkBoxRect.height()) / 2;QCheckBox checkBox;checkBox.setCheckState(m_logicalIndex.value(logicalIndex) ?Qt::Checked:Qt::Unchecked);checkBox.setStyleSheet(m_strStyleSheet);checkBox.setGeometry(checkBoxRect);painter->save();painter->translate(x, y);checkBox.render(painter);painter->restore();}else{QHeaderView::paintSection(painter, rect, logicalIndex);}
}

 

mousePressEvent实现点击时是否勾选复选框

void CheckBoxHeaderView::mousePressEvent(QMouseEvent *event)
{if (!(event->buttons() & Qt::LeftButton)){QHeaderView::mousePressEvent(event);return ;}int idx = this->logicalIndexAt(event->pos());if (!m_logicalIndex.contains(idx)){QHeaderView::mousePressEvent(event);return ;}m_logicalIndex[idx] = !m_logicalIndex[idx];viewport()->update();emit stateChanged(m_logicalIndex[idx], idx);return;
}

 为了能够更好的设置QHeaderView中某个单元格是否拥有复选框功能，所以添加以下这些操作。

QHash<int,bool> m_logicalIndex;
signals:void stateChanged(bool bChecked, int index);void CheckBoxHeaderView::setCheckable(QList<int> allIndex)
{bool bUpdate = false;for (int i=0; i<allIndex.size(); ++i){int id = allIndex.at(i);if (!m_logicalIndex.contains(id)){m_logicalIndex[id] = false;bUpdate = true;}}if (bUpdate){viewport()->update();}
}void CheckBoxHeaderView::setCheckable(int idx)
{if (!m_logicalIndex.contains(idx)){m_logicalIndex[idx] = false;viewport()->update();}
}void CheckBoxHeaderView::setUncheckable(QList<int> allIndex)
{bool bUpdate = false;for (int i=0; i<allIndex.size(); ++i){int id = allIndex.at(i);if (m_logicalIndex.contains(id)){m_logicalIndex.remove(id);bUpdate = true;}}if (bUpdate){viewport()->update();}
}void CheckBoxHeaderView::setUncheckable(int idx)
{if (m_logicalIndex.contains(idx)){m_logicalIndex.remove(idx);viewport()->update();}
}void CheckBoxHeaderView::setChecked(bool check, int idx)
{if (m_logicalIndex.contains(idx)){if (m_logicalIndex[idx] != check){m_logicalIndex[idx] = check;viewport()->update();}}
}bool CheckBoxHeaderView::isChecked(int idx) const
{if (m_logicalIndex.contains(idx)) {return m_logicalIndex[idx];}return false;
}