QStyledItemDelegate 如何让两个小部件排成一行?
QStyledItemDelegate how to make two widgets in one row?
我创建了一个 QStyledItemDelegate class,我想在其中使某些项目可检查,而另一些则带有两个小部件。但它不能正常工作。我错过了什么?这是它的样子:
查看第 1 行,看起来有两个小部件,但它们并没有真正显示出来。我需要一些帮助来使项目可检查(这与添加复选框不同?)。谢谢。
这是我的 QStyledItemDelegate class :
//! [0]
SpinBoxDelegate::SpinBoxDelegate(QObject *parent)
: QStyledItemDelegate(parent)
{
}
//! [0]
//! [1]
QWidget *SpinBoxDelegate::createEditor(QWidget *parent,
const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
if (index.row()==1) {
QLineEdit* lineBox;
QCheckBox* checkBox;
QWidget *panel;
panel = new QWidget(parent);
QHBoxLayout *layout = new QHBoxLayout;
lineBox = new QLineEdit( );
lineBox->setText("abc");
checkBox = new QCheckBox( );
layout->addWidget(checkBox);
layout->addWidget(lineBox);
panel->setLayout(layout);
return panel;
}else if (index.row()==2) {
// need to make this check-able item?
}else{
QLineEdit *editor = new QLineEdit(parent);
return editor;
}
}
//! [1]
//! [2]
void SpinBoxDelegate::setEditorData(QWidget *editor,
const QModelIndex &index) const
{
int value = index.model()->data(index, Qt::EditRole).toInt();
if (index.row()==1) {
// need something here?
}else{
QLineEdit *spinBox = static_cast<QLineEdit*>(editor);
spinBox->setText("value");
}
}
//! [2]
//! [3]
void SpinBoxDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
{
if (index.row()==1) {
// need something here?
}else{
QLineEdit *spinBox = static_cast<QLineEdit*>(editor);
model->setData(index, spinBox->text(), Qt::EditRole);
}
}
//! [3]
//! [4]
void SpinBoxDelegate::updateEditorGeometry(QWidget *editor,
const QStyleOptionViewItem &option, const QModelIndex &/* index */) const
{
editor->setGeometry(option.rect);
}
//! [4]
这是我的 main.cpp:
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QStandardItemModel model(4, 2);
//QTableView tableView;
QTreeView treeView;
treeView.setModel(&model);
SpinBoxDelegate delegate;
treeView.setItemDelegate(&delegate);
//! [0]
//tableView.horizontalHeader()->setStretchLastSection(true);
treeView.setRootIsDecorated(false);
treeView.setHeaderHidden(true);
treeView.setIndentation(20);
//! [1]
for (int row = 0; row < 4; ++row) {
for (int column = 0; column < 2; ++column) {
QModelIndex index = model.index(row, column, QModelIndex());
model.setData(index, QVariant((row + 1) * (column + 1)));
}
//! [1] //! [2]
}
//! [2]
//! [3]
treeView.setWindowTitle(QObject::tr("Spin Box Delegate"));
treeView.show();
return app.exec();
}
//! [3]
这就是我最终想要实现的:
要维护订单,您必须创建一个 class 来实现自定义小部件。
另一方面,您必须将数据存储在角色中,因为编辑器可以不断地创建和销毁。
要获得正确的大小,请使用存储在角色中的 sizeHint()
。
最后,为了让您始终可见,您必须使用 openPersistentEditor()
方法:
#include <QApplication>
#include <QHBoxLayout>
#include <QLineEdit>
#include <QCheckBox>
#include <QStyledItemDelegate>
#include <QStandardItemModel>
#include <QTreeView>
#include <QComboBox>
#include <QHeaderView>
enum CustomRoles{
SelectRole = Qt::UserRole
};
class EditorWidget: public QWidget{
Q_OBJECT
public:
EditorWidget(QWidget *parent=nullptr)
: QWidget(parent),
checkBox(new QCheckBox),
lineBox(new QLineEdit),
comboBox(new QComboBox)
{
QHBoxLayout *layout = new QHBoxLayout(this);
comboBox->addItems({"item1", "item2", "item3"});
layout->addWidget(checkBox);
layout->addWidget(lineBox);
layout->addWidget(comboBox);
}
int currentIndex(){
return comboBox->currentIndex();
}
void setCurrentIndex(int index){
comboBox->setCurrentIndex(index);
}
QString text() const{
return lineBox->text();
}
void setText(const QString &text){
lineBox->setText(text);
}
Qt::CheckState checkState() const{
return checkBox->checkState();
}
void setCheckState(Qt::CheckState state){
checkBox->setCheckState(state);
}
private:
QCheckBox *checkBox;
QLineEdit *lineBox;
QComboBox *comboBox;
};
class Delegate: public QStyledItemDelegate{
Q_OBJECT
public:
using QStyledItemDelegate::QStyledItemDelegate;
void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const{
Q_UNUSED(painter)
Q_UNUSED(option)
Q_UNUSED(index)
}
QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const{
Q_UNUSED(option)
Q_UNUSED(index)
EditorWidget *editor = new EditorWidget(parent);
return editor;
}
void setEditorData(QWidget *editor, const QModelIndex &index) const{
EditorWidget *widget = static_cast<EditorWidget*>(editor);
widget->blockSignals(true);
widget->setText(index.data(Qt::DisplayRole).toString());
Qt::CheckState state = static_cast<Qt::CheckState>(index.data(Qt::CheckStateRole).toInt());
widget->setCheckState(state);
widget->setCurrentIndex(index.data(CustomRoles::SelectRole).toInt());
widget->blockSignals(false);
}
void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const{
EditorWidget *widget = static_cast<EditorWidget*>(editor);
model->setData(index, widget->text(), Qt::DisplayRole);
model->setData(index, widget->checkState(), Qt::CheckStateRole);
model->setData(index, widget->sizeHint(), Qt::SizeHintRole);
model->setData(index, widget->currentIndex(), CustomRoles::SelectRole);
}
void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const{
Q_UNUSED(index)
editor->setGeometry(option.rect);
}
QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
{
QSize s = index.data(Qt::SizeHintRole).toSize();
return s.isValid() ? s: QStyledItemDelegate::sizeHint(option, index);
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QTreeView treeView;
QStandardItemModel model(4, 2);
treeView.setModel(&model);
Delegate delegate;
treeView.setItemDelegate(&delegate);
treeView.header()->setSectionResizeMode(QHeaderView::ResizeToContents);
treeView.setRootIsDecorated(false);
treeView.setHeaderHidden(true);
treeView.setIndentation(20);
for (int row = 0; row < 4; ++row) {
for (int column = 0; column < 2; ++column) {
QModelIndex index = model.index(row, column, QModelIndex());
model.setData(index, QVariant((row + 1) * (column + 1)));
treeView.openPersistentEditor(index);
}
}
treeView.resize(treeView.sizeHint());
treeView.show();
return a.exec();
}
#include "main.moc"
完整的例子可以在下面找到link
我创建了一个 QStyledItemDelegate class,我想在其中使某些项目可检查,而另一些则带有两个小部件。但它不能正常工作。我错过了什么?这是它的样子:
查看第 1 行,看起来有两个小部件,但它们并没有真正显示出来。我需要一些帮助来使项目可检查(这与添加复选框不同?)。谢谢。
这是我的 QStyledItemDelegate class :
//! [0]
SpinBoxDelegate::SpinBoxDelegate(QObject *parent)
: QStyledItemDelegate(parent)
{
}
//! [0]
//! [1]
QWidget *SpinBoxDelegate::createEditor(QWidget *parent,
const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
if (index.row()==1) {
QLineEdit* lineBox;
QCheckBox* checkBox;
QWidget *panel;
panel = new QWidget(parent);
QHBoxLayout *layout = new QHBoxLayout;
lineBox = new QLineEdit( );
lineBox->setText("abc");
checkBox = new QCheckBox( );
layout->addWidget(checkBox);
layout->addWidget(lineBox);
panel->setLayout(layout);
return panel;
}else if (index.row()==2) {
// need to make this check-able item?
}else{
QLineEdit *editor = new QLineEdit(parent);
return editor;
}
}
//! [1]
//! [2]
void SpinBoxDelegate::setEditorData(QWidget *editor,
const QModelIndex &index) const
{
int value = index.model()->data(index, Qt::EditRole).toInt();
if (index.row()==1) {
// need something here?
}else{
QLineEdit *spinBox = static_cast<QLineEdit*>(editor);
spinBox->setText("value");
}
}
//! [2]
//! [3]
void SpinBoxDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
{
if (index.row()==1) {
// need something here?
}else{
QLineEdit *spinBox = static_cast<QLineEdit*>(editor);
model->setData(index, spinBox->text(), Qt::EditRole);
}
}
//! [3]
//! [4]
void SpinBoxDelegate::updateEditorGeometry(QWidget *editor,
const QStyleOptionViewItem &option, const QModelIndex &/* index */) const
{
editor->setGeometry(option.rect);
}
//! [4]
这是我的 main.cpp:
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QStandardItemModel model(4, 2);
//QTableView tableView;
QTreeView treeView;
treeView.setModel(&model);
SpinBoxDelegate delegate;
treeView.setItemDelegate(&delegate);
//! [0]
//tableView.horizontalHeader()->setStretchLastSection(true);
treeView.setRootIsDecorated(false);
treeView.setHeaderHidden(true);
treeView.setIndentation(20);
//! [1]
for (int row = 0; row < 4; ++row) {
for (int column = 0; column < 2; ++column) {
QModelIndex index = model.index(row, column, QModelIndex());
model.setData(index, QVariant((row + 1) * (column + 1)));
}
//! [1] //! [2]
}
//! [2]
//! [3]
treeView.setWindowTitle(QObject::tr("Spin Box Delegate"));
treeView.show();
return app.exec();
}
//! [3]
这就是我最终想要实现的:
要维护订单,您必须创建一个 class 来实现自定义小部件。
另一方面,您必须将数据存储在角色中,因为编辑器可以不断地创建和销毁。
要获得正确的大小,请使用存储在角色中的 sizeHint()
。
最后,为了让您始终可见,您必须使用 openPersistentEditor()
方法:
#include <QApplication>
#include <QHBoxLayout>
#include <QLineEdit>
#include <QCheckBox>
#include <QStyledItemDelegate>
#include <QStandardItemModel>
#include <QTreeView>
#include <QComboBox>
#include <QHeaderView>
enum CustomRoles{
SelectRole = Qt::UserRole
};
class EditorWidget: public QWidget{
Q_OBJECT
public:
EditorWidget(QWidget *parent=nullptr)
: QWidget(parent),
checkBox(new QCheckBox),
lineBox(new QLineEdit),
comboBox(new QComboBox)
{
QHBoxLayout *layout = new QHBoxLayout(this);
comboBox->addItems({"item1", "item2", "item3"});
layout->addWidget(checkBox);
layout->addWidget(lineBox);
layout->addWidget(comboBox);
}
int currentIndex(){
return comboBox->currentIndex();
}
void setCurrentIndex(int index){
comboBox->setCurrentIndex(index);
}
QString text() const{
return lineBox->text();
}
void setText(const QString &text){
lineBox->setText(text);
}
Qt::CheckState checkState() const{
return checkBox->checkState();
}
void setCheckState(Qt::CheckState state){
checkBox->setCheckState(state);
}
private:
QCheckBox *checkBox;
QLineEdit *lineBox;
QComboBox *comboBox;
};
class Delegate: public QStyledItemDelegate{
Q_OBJECT
public:
using QStyledItemDelegate::QStyledItemDelegate;
void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const{
Q_UNUSED(painter)
Q_UNUSED(option)
Q_UNUSED(index)
}
QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const{
Q_UNUSED(option)
Q_UNUSED(index)
EditorWidget *editor = new EditorWidget(parent);
return editor;
}
void setEditorData(QWidget *editor, const QModelIndex &index) const{
EditorWidget *widget = static_cast<EditorWidget*>(editor);
widget->blockSignals(true);
widget->setText(index.data(Qt::DisplayRole).toString());
Qt::CheckState state = static_cast<Qt::CheckState>(index.data(Qt::CheckStateRole).toInt());
widget->setCheckState(state);
widget->setCurrentIndex(index.data(CustomRoles::SelectRole).toInt());
widget->blockSignals(false);
}
void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const{
EditorWidget *widget = static_cast<EditorWidget*>(editor);
model->setData(index, widget->text(), Qt::DisplayRole);
model->setData(index, widget->checkState(), Qt::CheckStateRole);
model->setData(index, widget->sizeHint(), Qt::SizeHintRole);
model->setData(index, widget->currentIndex(), CustomRoles::SelectRole);
}
void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const{
Q_UNUSED(index)
editor->setGeometry(option.rect);
}
QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
{
QSize s = index.data(Qt::SizeHintRole).toSize();
return s.isValid() ? s: QStyledItemDelegate::sizeHint(option, index);
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QTreeView treeView;
QStandardItemModel model(4, 2);
treeView.setModel(&model);
Delegate delegate;
treeView.setItemDelegate(&delegate);
treeView.header()->setSectionResizeMode(QHeaderView::ResizeToContents);
treeView.setRootIsDecorated(false);
treeView.setHeaderHidden(true);
treeView.setIndentation(20);
for (int row = 0; row < 4; ++row) {
for (int column = 0; column < 2; ++column) {
QModelIndex index = model.index(row, column, QModelIndex());
model.setData(index, QVariant((row + 1) * (column + 1)));
treeView.openPersistentEditor(index);
}
}
treeView.resize(treeView.sizeHint());
treeView.show();
return a.exec();
}
#include "main.moc"
完整的例子可以在下面找到link