c – Qt使用自定义QItemDelegate进行QTableView
作者:互联网
我按照Qt提供的Spin Box Delegate教程,尝试实现我自己的QItemDelegate.它将用于指定QComboBox以表示QTableView单元格中的数据,但它无法正常工作.
我最大的问题是我不知道我的QItemDelegate何时会被利用.
>当使用itemModel-> setData()或itemModel-> setItem()时.我怀疑是setItem(),因为我重新实现了一个QItemDelegate(强调“Item”),但教程使用了setData(),它运行正常.
>我知道如果指定的QItemDelegate不起作用,它会使用默认值,但我现在怎么说我指定的那个不起作用?
>我什么时候应该怀疑QTableView使用我的委托.我想指定每个单元格使用哪些代理.这是可能的还是QTableView只使用一个代理?
>一旦QTableView显示QComboBox,我如何指定填充QComboBox的项目?
我在这里实现了QItemDelegate:
>我尝试添加假设使用QComboBox的单元格的部分位于mainwindow.cpp中的注释“Enabled”下面.
qcomboboxitemdelegate.h
#ifndef QCOMBOBOXITEMDELEGATE_H
#define QCOMBOBOXITEMDELEGATE_H
#include <QItemDelegate>
#include <QComboBox>
class QComboBoxItemDelegate : public QItemDelegate
{
Q_OBJECT
public:
explicit QComboBoxItemDelegate(QObject *parent = 0);
QWidget* createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index);
void setEditorData(QWidget *editor, const QModelIndex &index);
void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index);
void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index);
signals:
private:
};
#endif // QCOMBOBOXITEMDELEGATE_H
qcomboboxitemdelegate.cpp
#include "qcomboboxitemdelegate.h"
#include <QDebug>
QComboBoxItemDelegate::QComboBoxItemDelegate(QObject *parent)
: QItemDelegate(parent)
{
}
QWidget* QComboBoxItemDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) {
// create widget for use
QComboBox* comboBox = new QComboBox(parent);
return comboBox;
}
void QComboBoxItemDelegate::setEditorData(QWidget *editor, const QModelIndex &index) {
// update model widget
QString value = index.model()->data(index, Qt::EditRole).toString();
qDebug() << "Value:" << value;
QComboBox* comboBox = static_cast<QComboBox*>(editor);
comboBox->setCurrentIndex(comboBox->findText(value));
}
void QComboBoxItemDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) {
// store edited model data to model
QComboBox* comboBox = static_cast<QComboBox*>(editor);
QString value = comboBox->currentText();
model->setData(index, value, Qt::EditRole);
}
void QComboBoxItemDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) {
editor->setGeometry(option.rect);
}
mainwindow.cpp:这是我初始化QStandardItemModel的地方
void MainWindow::init() {
itemModel = new QStandardItemModel(this);
}
void MainWindow::setupUi() {
this->setWindowTitle("QAlarmClock");
QStringList labelList;
labelList << "Alarm Name" << "Time" << "Enabled";
itemModel->setHorizontalHeaderLabels(labelList);
ui->tableView->setModel(itemModel);
ui->tableView->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);
ui->tableView->setItemDelegate(comboBoxItemDelegate);
}
void MainWindow::on_actionNew_triggered() {
alarmDialog = new AlarmDialog(this);
connect(alarmDialog, SIGNAL(on_close()), this, SLOT(on_alarmDialog_close()));
alarmDialog->exec();
}
mainwindow.cpp:这是我更新QStandardItemModel的地方
void MainWindow::on_alarmDialog_close() {
QString alarmName = alarmDialog->getAlarmName();
QDateTime alarmDateTime = alarmDialog->getDateTime();
itemModel->insertRow(itemModel->rowCount());
int rowCount = itemModel->rowCount();
// Alarm Name
QStandardItem* alarmItem = new QStandardItem(QIcon("res/alarmclock.ico"), alarmName);
itemModel->setItem(rowCount - 1 , 0, alarmItem);
// Date Time
QStandardItem* dateTimeItem = new QStandardItem();
dateTimeItem->setText(alarmDateTime.toString());
dateTimeItem->setEditable(false);
itemModel->setItem(rowCount - 1, 1, dateTimeItem);
// Enabled
QStandardItem* enabledItem = new QStandardItem();
QList<QStandardItem*> optionList;
optionList << new QStandardItem("Enabled") << new QStandardItem("Disabled");
enabledItem->appendRows(optionList);
itemModel->setItem(rowCount - 1, 2, enabledItem);
}
编辑1
qcomboboxdelegate.cpp
QWidget* QComboBoxItemDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) {
// create widget for use
qDebug() << "Column: " << index.column();
if (index.column() == 2) {
QComboBox* comboBox = new QComboBox(parent);
QStringList values;
values << "Enabled" << "Disabled";
comboBox->addItems(values);
return comboBox;
} else {
return QItemDelegate::createEditor(parent, option, index);
}
}
mainwindow.cpp
void MainWindow::on_alarmDialog_close() {
QList<QStandardItem*> row;
QString alarmName = alarmDialog->getAlarmName();
QDateTime alarmDateTime = alarmDialog->getDateTime();
QString status = "Enabled";
// Alarm Name
QStandardItem* alarmItem = new QStandardItem(QIcon("res/alarmclock.ico"), alarmName);
row << alarmItem;
// Date Time
QStandardItem* dateTimeItem = new QStandardItem();
dateTimeItem->setText(alarmDateTime.toString());
dateTimeItem->setEditable(false);
row << dateTimeItem;
// Enabled
QStandardItem* statusItem = new QStandardItem(status);
row << statusItem;
itemModel->appendRow(row);
}
解决方法:
首先,您应该有模型列的描述:
enum Columns
{
COL_NAME,
COL_TIME,
COL_STATUS
}
您的代表应仅适用于最后一列.
以下是如何填充模型的示例:
for (int i = 0; i < 5; ++i)
{
QStandardItem *itemName = new QStandardItem(QString("name %1").arg(i));
QStandardItem *itemTime = new QStandardItem(QString("time %1").arg(i));
QString status;
if (i % 2 == 0)
{
status = "Enabled";
}
else
{
status = "Disabled";
}
QStandardItem *itemStatus = new QStandardItem(status);
QList<QStandardItem*> row;
row << itemName << itemTime << itemStatus;
model->appendRow(row);
}
正如我所说,你的代表应该只适用于最后一栏.因此,您重新实现的所有方法都应该进行如下列检查:
QWidget* QComboBoxItemDelegate::createEditor(QWidget *parent,
const QStyleOptionViewItem &option,
const QModelIndex &index)
{
if (index.column() == COL_STATUS)
{
QStringList values;
values << "Enabled" << "Disabled";
QComboBox* comboBox = new QComboBox(parent);
comboBox->addItems(values);
return comboBox;
}
else
{
return QItemDelegate::createEditor(parent, option, index);
}
}
您应该将此检查添加到其他方法:如果当前列不是status列,则应使用基类(QItemDelegate)实现.
然后将代理设置为您的视图:
ui->tableView->setItemDelegate(new ComboBoxDelegate);
如果你做的一切正确,如果你试图编辑它的值,组合框将出现在最后一列.
标签:qtableview,qcombobox,c,qt,qitemdelegate 来源: https://codeday.me/bug/20191003/1850953.html