Qt 小例子学习48 - 在combobox内部拖放带listwidget

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Qt 小例子学习48 - 在combobox内部拖放带listwidget

ListWidget.h

#ifndef LISTWIDGET_H
#define LISTWIDGET_H#include <QListWidget>class ListWidget : public QListWidget
{Q_OBJECT
public:ListWidget(QWidget *parent = 0);void dropEvent(QDropEvent *event);protected:void mouseMoveEvent(QMouseEvent *event);
};
#endif // LISTWIDGET_H

ListWidget.cpp

#include "listwidget.h"#include <QComboBox>
#include <QDropEvent>ListWidget::ListWidget(QWidget *parent) : QListWidget(parent)
{setDragEnabled(true);setAcceptDrops(true);setDropIndicatorShown(true);setDefaultDropAction(Qt::MoveAction);
}void ListWidget::dropEvent(QDropEvent *event)
{if (event->dropAction() == Qt::MoveAction && event->source()){ListWidget *listWidget = qobject_cast<ListWidget *>(event->source());if (!listWidget)return;QList<QPersistentModelIndex> pIndexes;for (QModelIndex index : listWidget->selectedIndexes()){pIndexes << QPersistentModelIndex(index);}std::sort(pIndexes.begin(), pIndexes.end());QListWidgetItem *item = itemAt(event->pos());int rowStart = item ? row(item) : count();for (QPersistentModelIndex pindex : pIndexes){int r = QModelIndex(pindex).row();QComboBox *input = qobject_cast<QComboBox *>(listWidget->itemWidget(listWidget->item(r)));QComboBox *output;if (input){// move data to QComboBoxoutput = new QComboBox;for (int i = 0; i < input->count(); i++){output->addItem(input->itemText(i));output->setCurrentText(input->currentText());}}QListWidgetItem *it = listWidget->takeItem(r);insertItem(rowStart, it);if (input)setItemWidget(it, output);}setState(QAbstractItemView::NoState);}
}void ListWidget::mouseMoveEvent(QMouseEvent *event)
{setState(QAbstractItemView::DraggingState);QListWidget::mouseMoveEvent(event);
}

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"#include <QComboBox>
#include <QDir>
#include <QDirIterator>
#include <QFileInfoList>
#include <QListWidget>#include <QDebug>MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui->setupUi(this);QDir dir(":/icons");QFileInfoList fileInfoList =dir.entryInfoList(QDir::AllEntries | QDir::Dirs | QDir::NoDotAndDotDot);for (const QFileInfo &finfo : fileInfoList){QIcon icon;icon.addFile(finfo.absoluteFilePath(), QSize(), QIcon::Normal, QIcon::Off);QListWidgetItem *item = new QListWidgetItem;item->setIcon(icon);ui->listwidget1->insertItem(ui->listwidget1->count(), item);QComboBox *box = new QComboBox;box->addItems(QStringList{finfo.baseName(), "item1", "item2", "item3"});ui->listwidget1->setItemWidget(item, box);QSize size = item->sizeHint();size.setHeight(box->sizeHint().height());item->setSizeHint(size);}
}MainWindow::~MainWindow() { delete ui; }

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>namespace Ui
{
class MainWindow;
}class MainWindow : public QMainWindow
{Q_OBJECTpublic:explicit MainWindow(QWidget *parent = 0);~MainWindow();private:Ui::MainWindow *ui;
};#endif // MAINWINDOW_H

main.cpp

#include "mainwindow.h"
#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);MainWindow w;w.show();return a.exec();
}

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