qt 6.5.1 original

examples/widgets/draganddrop/draggableicons/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(draggableicons LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/draganddrop/draggableicons")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(draggableicons
+    dragwidget.cpp dragwidget.h
+    main.cpp
+)
+
+set_target_properties(draggableicons PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(draggableicons PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+)
+
+# Resources:
+set(draggableicons_resource_files
+    "images/boat.png"
+    "images/car.png"
+    "images/house.png"
+)
+
+qt_add_resources(draggableicons "draggableicons"
+    PREFIX
+        "/"
+    FILES
+        ${draggableicons_resource_files}
+)
+
+install(TARGETS draggableicons
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/widgets/draganddrop/draggableicons/draggableicons.pro

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+QT += widgets
+
+HEADERS     = dragwidget.h
+RESOURCES   = draggableicons.qrc
+SOURCES     = dragwidget.cpp \
+              main.cpp
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/draganddrop/draggableicons
+INSTALLS += target

examples/widgets/draganddrop/draggableicons/draggableicons.qrc

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+<!DOCTYPE RCC><RCC version="1.0">
+<qresource prefix="">
+   <file>images/boat.png</file>
+   <file>images/car.png</file>
+   <file>images/house.png</file>
+</qresource>
+</RCC>

examples/widgets/draganddrop/draggableicons/dragwidget.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QtWidgets>
+
+#include "dragwidget.h"
+
+//! [0]
+DragWidget::DragWidget(QWidget *parent)
+    : QFrame(parent)
+{
+    setMinimumSize(200, 200);
+    setFrameStyle(QFrame::Sunken | QFrame::StyledPanel);
+    setAcceptDrops(true);
+
+    QLabel *boatIcon = new QLabel(this);
+    boatIcon->setPixmap(QPixmap(":/images/boat.png"));
+    boatIcon->move(10, 10);
+    boatIcon->show();
+    boatIcon->setAttribute(Qt::WA_DeleteOnClose);
+
+    QLabel *carIcon = new QLabel(this);
+    carIcon->setPixmap(QPixmap(":/images/car.png"));
+    carIcon->move(100, 10);
+    carIcon->show();
+    carIcon->setAttribute(Qt::WA_DeleteOnClose);
+
+    QLabel *houseIcon = new QLabel(this);
+    houseIcon->setPixmap(QPixmap(":/images/house.png"));
+    houseIcon->move(10, 80);
+    houseIcon->show();
+    houseIcon->setAttribute(Qt::WA_DeleteOnClose);
+}
+//! [0]
+
+void DragWidget::dragEnterEvent(QDragEnterEvent *event)
+{
+    if (event->mimeData()->hasFormat("application/x-dnditemdata")) {
+        if (event->source() == this) {
+            event->setDropAction(Qt::MoveAction);
+            event->accept();
+        } else {
+            event->acceptProposedAction();
+        }
+    } else {
+        event->ignore();
+    }
+}
+
+void DragWidget::dragMoveEvent(QDragMoveEvent *event)
+{
+    if (event->mimeData()->hasFormat("application/x-dnditemdata")) {
+        if (event->source() == this) {
+            event->setDropAction(Qt::MoveAction);
+            event->accept();
+        } else {
+            event->acceptProposedAction();
+        }
+    } else {
+        event->ignore();
+    }
+}
+
+void DragWidget::dropEvent(QDropEvent *event)
+{
+    if (event->mimeData()->hasFormat("application/x-dnditemdata")) {
+        QByteArray itemData = event->mimeData()->data("application/x-dnditemdata");
+        QDataStream dataStream(&itemData, QIODevice::ReadOnly);
+
+        QPixmap pixmap;
+        QPoint offset;
+        dataStream >> pixmap >> offset;
+
+        QLabel *newIcon = new QLabel(this);
+        newIcon->setPixmap(pixmap);
+        newIcon->move(event->position().toPoint() - offset);
+        newIcon->show();
+        newIcon->setAttribute(Qt::WA_DeleteOnClose);
+
+        if (event->source() == this) {
+            event->setDropAction(Qt::MoveAction);
+            event->accept();
+        } else {
+            event->acceptProposedAction();
+        }
+    } else {
+        event->ignore();
+    }
+}
+
+//! [1]
+void DragWidget::mousePressEvent(QMouseEvent *event)
+{
+    QLabel *child = static_cast<QLabel*>(childAt(event->position().toPoint()));
+    if (!child)
+        return;
+
+    QPixmap pixmap = child->pixmap();
+
+    QByteArray itemData;
+    QDataStream dataStream(&itemData, QIODevice::WriteOnly);
+    dataStream << pixmap << QPoint(event->position().toPoint() - child->pos());
+//! [1]
+
+//! [2]
+    QMimeData *mimeData = new QMimeData;
+    mimeData->setData("application/x-dnditemdata", itemData);
+//! [2]
+
+//! [3]
+    QDrag *drag = new QDrag(this);
+    drag->setMimeData(mimeData);
+    drag->setPixmap(pixmap);
+    drag->setHotSpot(event->position().toPoint() - child->pos());
+//! [3]
+
+    QPixmap tempPixmap = pixmap;
+    QPainter painter;
+    painter.begin(&tempPixmap);
+    painter.fillRect(pixmap.rect(), QColor(127, 127, 127, 127));
+    painter.end();
+
+    child->setPixmap(tempPixmap);
+
+    if (drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction) == Qt::MoveAction) {
+        child->close();
+    } else {
+        child->show();
+        child->setPixmap(pixmap);
+    }
+}

examples/widgets/draganddrop/draggableicons/dragwidget.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef DRAGWIDGET_H
+#define DRAGWIDGET_H
+
+#include <QFrame>
+
+QT_BEGIN_NAMESPACE
+class QDragEnterEvent;
+class QDropEvent;
+QT_END_NAMESPACE
+
+//! [0]
+class DragWidget : public QFrame
+{
+public:
+    explicit DragWidget(QWidget *parent = nullptr);
+
+protected:
+    void dragEnterEvent(QDragEnterEvent *event) override;
+    void dragMoveEvent(QDragMoveEvent *event) override;
+    void dropEvent(QDropEvent *event) override;
+    void mousePressEvent(QMouseEvent *event) override;
+};
+//! [0]
+
+#endif // DRAGWIDGET_H

examples/widgets/draganddrop/draggableicons/main.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QApplication>
+#include <QHBoxLayout>
+
+#include "dragwidget.h"
+
+int main(int argc, char *argv[])
+{
+    Q_INIT_RESOURCE(draggableicons);
+
+    QApplication app(argc, argv);
+
+    QWidget mainWidget;
+    QHBoxLayout *horizontalLayout = new QHBoxLayout(&mainWidget);
+    horizontalLayout->addWidget(new DragWidget);
+    horizontalLayout->addWidget(new DragWidget);
+
+    mainWidget.setWindowTitle(QObject::tr("Draggable Icons"));
+    mainWidget.show();
+
+    return app.exec();
+}