Question

我目前是一名学生程序员，使用Qt在工作中构建GUI界面，我目前遇到了在Qt Documentation On the QTreeWidgetItem中找到解决方案的问题。我目前有一个界面，可以在QTree中编辑，删除和复制实例。了解树的填充方式可能很重要。 QTree中显示的项目以这种方式从向量动态追加。

void InjectionGUI::addInjections_Clicked() //creates a new instance of injections
{
    InjectionDialog newAddInjectionDialog; //where my dialog opens for user input
    InjectionData defaultValues; 
    newAddInjectionDialog.setData(defaultValues);
            if(newAddInjectionDialog.exec() == QDialog::Accepted)//a check data returns either Accepted or rejected 
            {
               qTableInjectionData.append(newAddInjectionDialog.transInjectionData); //this appends the valid data from the injection dialog to the vector qTableInjectionData
                ui->injectionTreeWidget->clear();
                for (int i=0; i < qTableInjectionData.size(); i++) // here I add the data from the vector to the tree widget.
                    {
                    InjectionData temp = qTableInjectionData.at(i);
                        QString injectionType;
                        QString tmpStr;
                        int column = 0;

                        //need sorting solution(still working on this)
                        if(temp.particleInjectionActive == true) // this evaluates the injection types
                        {
                            if(temp.particleInjectionOrLiquidDroplets == true)
                            {
                                injectionType += "(LD)";
                            }
                            else
                            {
                                injectionType += "(P)";
                            }
                        }
                        if(temp.fluidInjectionActive == true)
                        {
                            injectionType += "(F)";
                        }
                        QTreeWidgetItem *qTreeWidgetItemInjectionData = new QTreeWidgetItem(ui->injectionTreeWidget); //Here data is added into rows from each instance of injection dialog found in vector
                        qTreeWidgetItemInjectionData->setText(column++, tmpStr.setNum(i));
                        qTreeWidgetItemInjectionData->setText(column++, temp.lineEditInjectionName);
                        qTreeWidgetItemInjectionData->setText(column++, injectionType);
                        qTreeWidgetItemInjectionData->setText(column++, tmpStr.setNum(temp.lineEditParitcleVelocity));
                        qTreeWidgetItemInjectionData->setText(column++, tmpStr.setNum(temp.lineEditFluidVelocity));
                        qTreeWidgetItemInjectionData->setText(column++, tmpStr.setNum(temp.lineEditParticleMassFlow));
                        qTreeWidgetItemInjectionData->setText(column++, tmpStr.setNum(temp.lineEditFluidMassFlow));
                        qTreeWidgetItemInjectionData->setText(column++, temp.lineEditComment);
                    }
            }
}

现在我真的需要一种方法来找出用户在QTree中选择了哪个项目，以便我可以从Vector中删除它。我的psuedo是识别已选择哪一行，确认删除，删除itemAt（选中项目），重新分配ID列;因为每个实例都在此列中分配了一个数字。我正在查看三年前发布的post;但它主要只是回顾我已经审查过的文档。此外，选择的答案似乎非常不确定，因为其他答案似乎已走上正轨。我明白这个答案可能就在我面前;但我能说什么，新手将是新手，我很难理解实施。请留下富有成效的反馈，因为我只对学习和完成这项任务感兴趣。提前致谢。

Answer 1

您需要获取selectionModel，然后获取所选索引，然后迭代它们：

treeWidget->selectionModel()->selection();
  auto idx = sel.indexes();
  foreach(auto index, idx) {
    camModel_->removeRow(index.row());
  }
}

selectionModel位于QAbstractItemModel。请注意C ++ 11 auto。

QTreeWidgetItem：我如何获得所选项目？

1 个答案: