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如题所示#xff0c;通过setCheckable添加复选框后#xff0c;想要通过setCheckable(false)取消复选框#xff0c;你会发现根本没有作用的。
问题复现
#include widget.h
#include ui_widget.h
#include QListWidget::Widget(QWidg…前言
如题所示通过setCheckable添加复选框后想要通过setCheckable(false)取消复选框你会发现根本没有作用的。
问题复现
#include widget.h
#include ui_widget.h
#include QListWidget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget)
{ui-setupUi(this);m_model new QStandardItemModel(this);m_model-setHorizontalHeaderLabels(QStringList() QStringLiteral(班级/名称) QStringLiteral(性别) QStringLiteral(学号));QStandardItem *class_1 new QStandardItem(QStringLiteral(班级1));QStandardItem *st1_name new QStandardItem(QStringLiteral(小明));//这个item添加复选框st1_name-setCheckable(true);QStandardItem *st1_sex new QStandardItem(QStringLiteral(男));QStandardItem *st1_number new QStandardItem(QStringLiteral(1));QStandardItem *st2_name new QStandardItem(QStringLiteral(老王));st2_name-setCheckable(true);QStandardItem *st2_sex new QStandardItem(QStringLiteral(男));QStandardItem *st2_number new QStandardItem(QStringLiteral(2));class_1-appendRow(QListQStandardItem*() st1_name st1_sex st1_number);class_1-appendRow(QListQStandardItem*() st2_name st2_sex st2_number);QStandardItem *class_2 new QStandardItem(QStringLiteral(班级2));QStandardItem *st3_name new QStandardItem(QStringLiteral(小翠));st3_name-setCheckable(true);QStandardItem *st3_sex new QStandardItem(QStringLiteral(女));QStandardItem *st3_number new QStandardItem(QStringLiteral(3));QStandardItem *st4_name new QStandardItem(QStringLiteral(小红));st4_name-setCheckable(true);QStandardItem *st4_sex new QStandardItem(QStringLiteral(女));QStandardItem *st4_number new QStandardItem(QStringLiteral(4));class_2-appendRow(QListQStandardItem*() st3_name st3_sex st3_number);class_2-appendRow(QListQStandardItem*() st4_name st4_sex st4_number);m_model-appendRow(class_1);m_model-appendRow(class_2);ui-treeView-setModel(m_model);
}Widget::~Widget()
{delete ui;
}效果如下
通过 setCheckable(false) 取消复选框的设置
void Widget::on_pushButton_clicked()
{QStandardItem *item m_model-item(0, 0)-child(0, 0);qDebug() item-text();item-setCheckable(false);
}
经过测试发现根本没有效果。正确的姿势
void Widget::on_pushButton_clicked()
{QStandardItem *item m_model-item(0, 0)-child(0, 0);qDebug() item-text();item-setData(QVariant(), Qt::CheckStateRole);
}通过源码我们可以看到 setCheckable(true)是进行了如下操作
/*!Sets whether the item is user-checkable. If \a checkable is true, theitem can be checked by the user; otherwise, the user cannot checkthe item.The item delegate will render a checkable item with a check box next to theitems text.\sa isCheckable(), setCheckState(), setUserTristate(), setAutoTristate()
*/
void QStandardItem::setCheckable(bool checkable)
{Q_D(QStandardItem);if (checkable !isCheckable()) {// make sure theres data for the checkstate roleif (!data(Qt::CheckStateRole).isValid())setData(Qt::Unchecked, Qt::CheckStateRole);}d-changeFlags(checkable, Qt::ItemIsUserCheckable);
}可以看见实际上使用setCheckable(true)最后也是调用了setData(Qt::Unchecked, Qt::CheckStateRole)函数而已。
