Qt添加事件过滤器，设置拖放listWidget、TreeWidget、TableWidget控件。
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
//设置控件可以拖放
ui->listWidgetSourse->setAcceptDrops(true);
ui->listWidgetSourse->setDragEnabled(true);
ui->listWidgetSourse->setDefaultDropAction(Qt::CopyAction);
ui->listWidgetSourse->setDragDropMode(QAbstractItemView::DragDrop);
ui->listWidget->setAcceptDrops(true);
ui->listWidget->setDragEnabled(true);
ui->listWidget->setDefaultDropAction(Qt::CopyAction);
ui->listWidget->setDragDropMode(QAbstractItemView::DragDrop);
ui->treeWidget->setAcceptDrops(true);
ui->treeWidget->setDragEnabled(true);
ui->treeWidget->setDefaultDropAction(Qt::CopyAction);
ui->treeWidget->setDragDropMode(QAbstractItemView::DragDrop);
ui->tableWidget->setAcceptDrops(true);
ui->tableWidget->setDragEnabled(true);
ui->tableWidget->setDefaultDropAction(Qt::MoveAction);
ui->tableWidget->setDragDropMode(QAbstractItemView::DragDrop);
//为小部件添加事件过滤器
ui->listWidgetSourse->installEventFilter(this);
ui->listWidget->installEventFilter(this);
ui->treeWidget->installEventFilter(this);
ui->tableWidget->installEventFilter(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::refreshToUI(QGroupBox *currGroupBox)
{
ui->checkBoxAcceptDrops->setChecked(m_itemView->acceptDrops());
ui->checkBoxDropEnabled->setChecked(m_itemView->dragEnabled());
ui->comboBox->setCurrentIndex((int)m_itemView->dragDropMode());
int index = getGroupActionIndex(m_itemView->defaultDropAction());
ui->comboBoxDefaultAction->setCurrentIndex(index);
QFont fout = ui->groupBoxSourse->font();
fout.setBold(false);
ui->groupBox->setFont(fout);
ui->groupBoxList->setFont(fout);
ui->groupBoxSourse->setFont(fout);
ui->groupBoxTree->setFont(fout);
fout.setBold(true);
currGroupBox->setFont(fout);
}
int MainWindow::getGroupActionIndex(Qt::DropAction actionType)
{
switch (actionType) {
case Qt::CopyAction :
return 0;
case Qt::MoveAction :
return 1;
case Qt::LinkAction :
return 2;
case Qt::ActionMask :
return 3;
default:
return 0;
}
}
Qt::DropAction MainWindow::getGroupActionTyp(int index)
{
switch (index) {
case 0:
return Qt::CopyAction;
case 1:
return Qt::MoveAction;
case 2:
return Qt::LinkAction;
case 3:
return Qt::ActionMask;
default:
return Qt::CopyAction;
}
}
//设置返回值，如果将返回值设置为eventFilter(watched,event);，程序直接奔溃，目前还没有找到原因
bool MainWindow::eventFilter(QObject *watched, QEvent *event)
{
if(event->type() != QEvent::KeyPress){
return false;
// return eventFilter(watched,event);
}
QKeyEvent * keyEvent = static_cast<QKeyEvent*>(event);
if(keyEvent->key() != Qt::Key_Delete){
return false;
// return eventFilter(watched,event);
}
if(watched == ui->listWidgetSourse){
//判断是否是listWidgetSourse委托
delete ui->listWidgetSourse->takeItem(ui->listWidgetSourse->currentRow());//删除当前行
}else if(watched == ui->listWidget){
delete ui->listWidget->takeItem(ui->listWidget->currentRow());//删除当前行
}else if(watched == ui->treeWidget){
QTreeWidgetItem * treeItem = ui->treeWidget->currentItem();//获取当前索引项。tree中需要判断这个tree到底有没有父项
if(treeItem->parent() != nullptr){
//判断父索引是否为空
treeItem->parent()->removeChild(treeItem);
}else{
int index = ui->treeWidget->indexOfTopLevelItem(treeItem);
ui->treeWidget->takeTopLevelItem(index);
}
delete treeItem;
}else if(watched == ui->tableWidget){
delete ui->tableWidget->takeItem(ui->tableWidget->currentRow(),ui->tableWidget->currentColumn());
}
return eventFilter(watched,event);
//return true;
}
void MainWindow::on_radioButton_clicked()
{
m_itemView = ui->listWidgetSourse;
refreshToUI(ui->groupBoxSourse);
}
void MainWindow::on_radioButtonList_clicked()
{
m_itemView = ui->listWidget;
refreshToUI(ui->groupBoxList);
}
void MainWindow::on_radioButtonTree_clicked()
{
m_itemView = ui->treeWidget;
refreshToUI(ui->groupBoxTree);
}
void MainWindow::on_radioButtonTable_clicked()
{
m_itemView = ui->tableWidget;
refreshToUI(ui->groupBox);
}
