c++ - Qt5 C++ 如何访问模型中的项目以检查状态？

Question

我有一个包含多个复选框项目的组合框，我需要能够遍历它们并确定它们是否被选中，或者更合适的是，一旦选中一个项目，就触发一个事件，但我不能似乎让信号/插槽组合正常工作。

这是我的一些代码:

void MainWindow::setupQueryBuilder(Ui::MainWindow* ui)
{
    QStandardItemModel* assessmentModel = new QStandardItemModel(3, 1);
    QStandardItem* assessmentPleaseSelect = new QStandardItem();
    QStandardItem* assessmentVisionScreening = new QStandardItem();
    QStandardItem* assessmentHearingAssessment = new QStandardItem();
    QStandardItem* assessmentDevelopmentalAssessment = new QStandardItem();

    assessmentPleaseSelect->setText("Please Select...");
    assessmentPleaseSelect->setFlags(Qt::ItemIsEnabled);
    assessmentPleaseSelect->setData(Qt::CheckStateRole);

    assessmentVisionScreening->setText("Vision Screening");
    assessmentVisionScreening->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled);
    assessmentVisionScreening->setData(Qt::Unchecked, Qt::CheckStateRole);

    assessmentHearingAssessment->setText("Hearing Assessment");
    assessmentHearingAssessment->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled);
    assessmentHearingAssessment->setData(Qt::Unchecked, Qt::CheckStateRole);

    assessmentDevelopmentalAssessment->setText("Developmental Assessment");
    assessmentDevelopmentalAssessment->setFlags(Qt::ItemIsUserCheckable | Qt::ItemIsEnabled);
    assessmentDevelopmentalAssessment->setData(Qt::Unchecked, Qt::CheckStateRole);

    assessmentModel->insertRow(0, assessmentPleaseSelect);
    assessmentModel->insertRow(1, assessmentVisionScreening);
    assessmentModel->insertRow(2, assessmentHearingAssessment);
    assessmentModel->insertRow(3, assessmentDevelopmentalAssessment);

    ui->SearchAssessmentSelect->setModel(assessmentModel);
}

Answer 1

我没有试过这个，但是通过查看文档，你有一个 signal 用于 QStandardItemModel 称为 itemChanged(QStandardItem *item) .您想要做的是创建一个名为(例如)modelItemChanged(QStandardItem *item) 的 slot 并将它们connect connect(assessmentModel, SIGNAL(itemChanged(QStandardItem *)), this, SLOT(modelItemChanged(QStandardItem *))).

这应该将您的模型设置为在 QStandardItem 更改时触发 slot，并且它会传递一个指向已更改项目的指针。在您的 modelItemChanged(QStandardItem *item) 函数中，您可以查询 QStandardItem *item 以查看它处于什么状态。