qt 6.5.1 original

examples/widgets/draganddrop/fridgemagnets/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(fridgemagnets LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/draganddrop/fridgemagnets")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(fridgemagnets
+    draglabel.cpp draglabel.h
+    dragwidget.cpp dragwidget.h
+    main.cpp
+)
+
+set_target_properties(fridgemagnets PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(fridgemagnets PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+)
+
+# Resources:
+set(fridgemagnets_resource_files
+    "words.txt"
+)
+
+qt_add_resources(fridgemagnets "fridgemagnets"
+    PREFIX
+        "/dictionary"
+    FILES
+        ${fridgemagnets_resource_files}
+)
+
+install(TARGETS fridgemagnets
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/widgets/draganddrop/fridgemagnets/draglabel.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "draglabel.h"
+
+#include <QtWidgets>
+
+//! [0]
+DragLabel::DragLabel(const QString &text, QWidget *parent)
+    : QLabel(parent)
+{
+    QFontMetrics metric(font());
+    QSize size = metric.size(Qt::TextSingleLine, text);
+
+    QImage image(size.width() + 12, size.height() + 12, QImage::Format_ARGB32_Premultiplied);
+    image.fill(qRgba(0, 0, 0, 0));
+
+    QFont font;
+    font.setStyleStrategy(QFont::ForceOutline);
+//! [0]
+
+//! [1]
+    QLinearGradient gradient(0, 0, 0, image.height()-1);
+    gradient.setColorAt(0.0, Qt::white);
+    gradient.setColorAt(0.2, QColor(200, 200, 255));
+    gradient.setColorAt(0.8, QColor(200, 200, 255));
+    gradient.setColorAt(1.0, QColor(127, 127, 200));
+
+    QPainter painter;
+    painter.begin(&image);
+    painter.setRenderHint(QPainter::Antialiasing);
+    painter.setBrush(gradient);
+    painter.drawRoundedRect(QRectF(0.5, 0.5, image.width()-1, image.height()-1),
+                            25, 25, Qt::RelativeSize);
+
+    painter.setFont(font);
+    painter.setBrush(Qt::black);
+    painter.drawText(QRect(QPoint(6, 6), size), Qt::AlignCenter, text);
+    painter.end();
+//! [1]
+
+//! [2]
+    setPixmap(QPixmap::fromImage(image));
+    m_labelText = text;
+}
+//! [2]
+
+QString DragLabel::labelText() const
+{
+    return m_labelText;
+}

examples/widgets/draganddrop/fridgemagnets/draglabel.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef DRAGLABEL_H
+#define DRAGLABEL_H
+
+#include <QLabel>
+
+QT_BEGIN_NAMESPACE
+class QDragEnterEvent;
+class QDragMoveEvent;
+class QFrame;
+QT_END_NAMESPACE
+
+//! [0]
+class DragLabel : public QLabel
+{
+public:
+    DragLabel(const QString &text, QWidget *parent);
+    QString labelText() const;
+
+private:
+    QString m_labelText;
+};
+//! [0]
+
+#endif // DRAGLABEL_H

examples/widgets/draganddrop/fridgemagnets/dragwidget.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "draglabel.h"
+#include "dragwidget.h"
+
+#include <QtWidgets>
+
+static inline QString fridgetMagnetsMimeType() { return QStringLiteral("application/x-fridgemagnet"); }
+
+//! [0]
+DragWidget::DragWidget(QWidget *parent)
+    : QWidget(parent)
+{
+    QFile dictionaryFile(QStringLiteral(":/dictionary/words.txt"));
+    dictionaryFile.open(QFile::ReadOnly);
+    QTextStream inputStream(&dictionaryFile);
+//! [0]
+
+//! [1]
+    int x = 5;
+    int y = 5;
+
+    while (!inputStream.atEnd()) {
+        QString word;
+        inputStream >> word;
+        if (!word.isEmpty()) {
+            DragLabel *wordLabel = new DragLabel(word, this);
+            wordLabel->move(x, y);
+            wordLabel->show();
+            wordLabel->setAttribute(Qt::WA_DeleteOnClose);
+            x += wordLabel->width() + 2;
+            if (x >= 245) {
+                x = 5;
+                y += wordLabel->height() + 2;
+            }
+        }
+    }
+//! [1]
+
+//! [2]
+    QPalette newPalette = palette();
+    newPalette.setColor(QPalette::Window, Qt::white);
+    setPalette(newPalette);
+
+    setMinimumSize(400, qMax(200, y));
+    setWindowTitle(tr("Fridge Magnets"));
+//! [2] //! [3]
+    setAcceptDrops(true);
+}
+//! [3]
+
+//! [4]
+void DragWidget::dragEnterEvent(QDragEnterEvent *event)
+{
+//! [4] //! [5]
+    if (event->mimeData()->hasFormat(fridgetMagnetsMimeType())) {
+        if (children().contains(event->source())) {
+            event->setDropAction(Qt::MoveAction);
+            event->accept();
+        } else {
+            event->acceptProposedAction();
+//! [5] //! [6]
+        }
+//! [6] //! [7]
+    } else if (event->mimeData()->hasText()) {
+        event->acceptProposedAction();
+    } else {
+        event->ignore();
+    }
+}
+//! [7]
+
+//! [8]
+void DragWidget::dragMoveEvent(QDragMoveEvent *event)
+{
+    if (event->mimeData()->hasFormat(fridgetMagnetsMimeType())) {
+        if (children().contains(event->source())) {
+            event->setDropAction(Qt::MoveAction);
+            event->accept();
+        } else {
+            event->acceptProposedAction();
+        }
+    } else if (event->mimeData()->hasText()) {
+        event->acceptProposedAction();
+    } else {
+        event->ignore();
+    }
+}
+//! [8]
+
+//! [9]
+void DragWidget::dropEvent(QDropEvent *event)
+{
+    if (event->mimeData()->hasFormat(fridgetMagnetsMimeType())) {
+        const QMimeData *mime = event->mimeData();
+//! [9] //! [10]
+        QByteArray itemData = mime->data(fridgetMagnetsMimeType());
+        QDataStream dataStream(&itemData, QIODevice::ReadOnly);
+
+        QString text;
+        QPoint offset;
+        dataStream >> text >> offset;
+//! [10]
+//! [11]
+        DragLabel *newLabel = new DragLabel(text, this);
+        newLabel->move(event->position().toPoint() - offset);
+        newLabel->show();
+        newLabel->setAttribute(Qt::WA_DeleteOnClose);
+
+        if (event->source() == this) {
+            event->setDropAction(Qt::MoveAction);
+            event->accept();
+        } else {
+            event->acceptProposedAction();
+        }
+//! [11] //! [12]
+    } else if (event->mimeData()->hasText()) {
+        QStringList pieces = event->mimeData()->text().split(
+            QRegularExpression(QStringLiteral("\\s+")), Qt::SkipEmptyParts);
+        QPoint position = event->position().toPoint();
+
+        for (const QString &piece : pieces) {
+            DragLabel *newLabel = new DragLabel(piece, this);
+            newLabel->move(position);
+            newLabel->show();
+            newLabel->setAttribute(Qt::WA_DeleteOnClose);
+
+            position += QPoint(newLabel->width(), 0);
+        }
+
+        event->acceptProposedAction();
+    } else {
+        event->ignore();
+    }
+}
+//! [12]
+
+//! [13]
+void DragWidget::mousePressEvent(QMouseEvent *event)
+{
+//! [13]
+//! [14]
+    DragLabel *child = static_cast<DragLabel*>(childAt(event->position().toPoint()));
+    if (!child)
+        return;
+
+    QPoint hotSpot = event->position().toPoint() - child->pos();
+
+    QByteArray itemData;
+    QDataStream dataStream(&itemData, QIODevice::WriteOnly);
+    dataStream << child->labelText() << QPoint(hotSpot);
+//! [14]
+
+//! [15]
+    QMimeData *mimeData = new QMimeData;
+    mimeData->setData(fridgetMagnetsMimeType(), itemData);
+    mimeData->setText(child->labelText());
+//! [15]
+
+//! [16]
+    QDrag *drag = new QDrag(this);
+    drag->setMimeData(mimeData);
+    drag->setPixmap(child->pixmap());
+    drag->setHotSpot(hotSpot);
+
+    child->hide();
+//! [16]
+
+//! [17]
+    if (drag->exec(Qt::MoveAction | Qt::CopyAction, Qt::CopyAction) == Qt::MoveAction)
+        child->close();
+    else
+        child->show();
+}
+//! [17]

examples/widgets/draganddrop/fridgemagnets/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 <QWidget>
+
+QT_BEGIN_NAMESPACE
+class QDragEnterEvent;
+class QDropEvent;
+QT_END_NAMESPACE
+
+//! [0]
+class DragWidget : public QWidget
+{
+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/fridgemagnets/fridgemagnets.pro

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

examples/widgets/draganddrop/fridgemagnets/fridgemagnets.qrc

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+<!DOCTYPE RCC><RCC version="1.0">
+<qresource prefix="/dictionary">
+   <file>words.txt</file>
+</qresource>
+</RCC>

examples/widgets/draganddrop/fridgemagnets/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 "dragwidget.h"
+
+int main(int argc, char *argv[])
+{
+    Q_INIT_RESOURCE(fridgemagnets);
+
+    QApplication app(argc, argv);
+#ifdef QT_KEYPAD_NAVIGATION
+    QApplication::setNavigationMode(Qt::NavigationModeCursorAuto);
+#endif
+    DragWidget window;
+
+    bool smallScreen = QApplication::arguments().contains(QStringLiteral("-small-screen"));
+    if (smallScreen)
+        window.showFullScreen();
+    else
+        window.show();
+
+    return app.exec();
+}

examples/widgets/draganddrop/fridgemagnets/words.txt

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+Colorless
+green
+ideas
+sleep
+furiously
+A
+colorless
+green
+idea
+is
+a
+new
+untried
+idea
+that
+is
+without
+vividness
+dull
+and
+unexciting
+To
+sleep
+furiously
+may
+seem
+a
+puzzling
+turn
+of
+phrase
+but
+the
+mind
+in
+sleep
+often
+indeed
+moves
+furiously
+with
+ideas
+and
+images
+flickering
+in
+and
+out