qt 6.5.1 original

examples/widgets/itemviews/stardelegate/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(stardelegate LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/itemviews/stardelegate")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(stardelegate
+    main.cpp
+    stardelegate.cpp stardelegate.h
+    stareditor.cpp stareditor.h
+    starrating.cpp starrating.h
+)
+
+set_target_properties(stardelegate PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(stardelegate PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+)
+
+install(TARGETS stardelegate
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/widgets/itemviews/stardelegate/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 <QTableWidget>
+
+#include "stardelegate.h"
+#include "stareditor.h"
+#include "starrating.h"
+
+//! [0]
+void populateTableWidget(QTableWidget *tableWidget)
+{
+    static constexpr struct {
+        const char *title;
+        const char *genre;
+        const char *artist;
+        int rating;
+    } staticData[] = {
+//! [0] //! [1]
+        { "Mass in B-Minor", "Baroque", "J.S. Bach", 5 },
+//! [1]
+        { "Three More Foxes", "Jazz", "Maynard Ferguson", 4 },
+        { "Sex Bomb", "Pop", "Tom Jones", 3 },
+        { "Barbie Girl", "Pop", "Aqua", 5 },
+//! [2]
+        { nullptr, nullptr, nullptr, 0 }
+//! [2] //! [3]
+    };
+//! [3] //! [4]
+
+    for (int row = 0; staticData[row].title != nullptr; ++row) {
+        QTableWidgetItem *item0 = new QTableWidgetItem(staticData[row].title);
+        QTableWidgetItem *item1 = new QTableWidgetItem(staticData[row].genre);
+        QTableWidgetItem *item2 = new QTableWidgetItem(staticData[row].artist);
+        QTableWidgetItem *item3 = new QTableWidgetItem;
+        item3->setData(0,
+                       QVariant::fromValue(StarRating(staticData[row].rating)));
+
+        tableWidget->setItem(row, 0, item0);
+        tableWidget->setItem(row, 1, item1);
+        tableWidget->setItem(row, 2, item2);
+        tableWidget->setItem(row, 3, item3);
+    }
+}
+//! [4]
+
+//! [5]
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+
+    QTableWidget tableWidget(4, 4);
+    tableWidget.setItemDelegate(new StarDelegate);
+    tableWidget.setEditTriggers(QAbstractItemView::DoubleClicked
+                                | QAbstractItemView::SelectedClicked);
+    tableWidget.setSelectionBehavior(QAbstractItemView::SelectRows);
+    tableWidget.setHorizontalHeaderLabels({"Title", "Genre", "Artist", "Rating"});
+
+    populateTableWidget(&tableWidget);
+
+    tableWidget.resizeColumnsToContents();
+    tableWidget.resize(500, 300);
+    tableWidget.show();
+
+    return app.exec();
+}
+//! [5]

examples/widgets/itemviews/stardelegate/stardelegate.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 "stardelegate.h"
+#include "stareditor.h"
+#include "starrating.h"
+
+//! [0]
+void StarDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
+                         const QModelIndex &index) const
+{
+    if (index.data().canConvert<StarRating>()) {
+        StarRating starRating = qvariant_cast<StarRating>(index.data());
+
+        if (option.state & QStyle::State_Selected)
+            painter->fillRect(option.rect, option.palette.highlight());
+
+        starRating.paint(painter, option.rect, option.palette,
+                         StarRating::EditMode::ReadOnly);
+    } else {
+        QStyledItemDelegate::paint(painter, option, index);
+    }
+//! [0]
+}
+
+//! [1]
+QSize StarDelegate::sizeHint(const QStyleOptionViewItem &option,
+                             const QModelIndex &index) const
+{
+    if (index.data().canConvert<StarRating>()) {
+        StarRating starRating = qvariant_cast<StarRating>(index.data());
+        return starRating.sizeHint();
+    }
+    return QStyledItemDelegate::sizeHint(option, index);
+}
+//! [1]
+
+//! [2]
+QWidget *StarDelegate::createEditor(QWidget *parent,
+                                    const QStyleOptionViewItem &option,
+                                    const QModelIndex &index) const
+
+{
+    if (index.data().canConvert<StarRating>()) {
+        StarEditor *editor = new StarEditor(parent);
+        connect(editor, &StarEditor::editingFinished,
+                this, &StarDelegate::commitAndCloseEditor);
+        return editor;
+    }
+    return QStyledItemDelegate::createEditor(parent, option, index);
+}
+//! [2]
+
+//! [3]
+void StarDelegate::setEditorData(QWidget *editor,
+                                 const QModelIndex &index) const
+{
+    if (index.data().canConvert<StarRating>()) {
+        StarRating starRating = qvariant_cast<StarRating>(index.data());
+        StarEditor *starEditor = qobject_cast<StarEditor *>(editor);
+        starEditor->setStarRating(starRating);
+    } else {
+        QStyledItemDelegate::setEditorData(editor, index);
+    }
+}
+//! [3]
+
+//! [4]
+void StarDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
+                                const QModelIndex &index) const
+{
+    if (index.data().canConvert<StarRating>()) {
+        StarEditor *starEditor = qobject_cast<StarEditor *>(editor);
+        model->setData(index, QVariant::fromValue(starEditor->starRating()));
+    } else {
+        QStyledItemDelegate::setModelData(editor, model, index);
+    }
+}
+//! [4]
+
+//! [5]
+void StarDelegate::commitAndCloseEditor()
+{
+    StarEditor *editor = qobject_cast<StarEditor *>(sender());
+    emit commitData(editor);
+    emit closeEditor(editor);
+}
+//! [5]

examples/widgets/itemviews/stardelegate/stardelegate.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef STARDELEGATE_H
+#define STARDELEGATE_H
+
+#include <QStyledItemDelegate>
+
+//! [0]
+class StarDelegate : public QStyledItemDelegate
+{
+    Q_OBJECT
+public:
+    using QStyledItemDelegate::QStyledItemDelegate;
+
+    void paint(QPainter *painter, const QStyleOptionViewItem &option,
+               const QModelIndex &index) const override;
+    QSize sizeHint(const QStyleOptionViewItem &option,
+                   const QModelIndex &index) const override;
+    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
+                          const QModelIndex &index) const override;
+    void setEditorData(QWidget *editor, const QModelIndex &index) const override;
+    void setModelData(QWidget *editor, QAbstractItemModel *model,
+                      const QModelIndex &index) const override;
+
+private slots:
+    void commitAndCloseEditor();
+};
+//! [0]
+
+#endif

examples/widgets/itemviews/stardelegate/stardelegate.pro

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+QT += widgets
+requires(qtConfig(tablewidget))
+
+HEADERS       = stardelegate.h \
+                stareditor.h \
+                starrating.h
+SOURCES       = main.cpp \
+                stardelegate.cpp \
+                stareditor.cpp \
+                starrating.cpp
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/itemviews/stardelegate
+INSTALLS += target

examples/widgets/itemviews/stardelegate/stareditor.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "stareditor.h"
+#include "starrating.h"
+
+#include <QtWidgets>
+
+//! [0]
+StarEditor::StarEditor(QWidget *parent)
+    : QWidget(parent)
+{
+    setMouseTracking(true);
+    setAutoFillBackground(true);
+}
+//! [0]
+
+QSize StarEditor::sizeHint() const
+{
+    return myStarRating.sizeHint();
+}
+
+//! [1]
+void StarEditor::paintEvent(QPaintEvent *)
+{
+    QPainter painter(this);
+    myStarRating.paint(&painter, rect(), palette(),
+                       StarRating::EditMode::Editable);
+}
+//! [1]
+
+//! [2]
+void StarEditor::mouseMoveEvent(QMouseEvent *event)
+{
+    const int star = starAtPosition(event->position().toPoint().x());
+
+    if (star != myStarRating.starCount() && star != -1) {
+        myStarRating.setStarCount(star);
+        update();
+    }
+    QWidget::mouseMoveEvent(event);
+}
+//! [2]
+
+//! [3]
+void StarEditor::mouseReleaseEvent(QMouseEvent *event)
+{
+    emit editingFinished();
+    QWidget::mouseReleaseEvent(event);
+}
+//! [3]
+
+//! [4]
+int StarEditor::starAtPosition(int x) const
+{
+    const int star = (x / (myStarRating.sizeHint().width()
+                           / myStarRating.maxStarCount())) + 1;
+    if (star <= 0 || star > myStarRating.maxStarCount())
+        return -1;
+
+    return star;
+}
+//! [4]

examples/widgets/itemviews/stardelegate/stareditor.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef STAREDITOR_H
+#define STAREDITOR_H
+
+#include <QWidget>
+
+#include "starrating.h"
+
+//! [0]
+class StarEditor : public QWidget
+{
+    Q_OBJECT
+public:
+    StarEditor(QWidget *parent = nullptr);
+
+    QSize sizeHint() const override;
+    void setStarRating(const StarRating &starRating) {
+        myStarRating = starRating;
+    }
+    StarRating starRating() { return myStarRating; }
+
+signals:
+    void editingFinished();
+
+protected:
+    void paintEvent(QPaintEvent *event) override;
+    void mouseMoveEvent(QMouseEvent *event) override;
+    void mouseReleaseEvent(QMouseEvent *event) override;
+
+private:
+    int starAtPosition(int x) const;
+
+    StarRating myStarRating;
+};
+//! [0]
+
+#endif

examples/widgets/itemviews/stardelegate/starrating.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "starrating.h"
+
+#include <QtWidgets>
+#include <cmath>
+
+constexpr int PaintingScaleFactor = 20;
+
+//! [0]
+StarRating::StarRating(int starCount, int maxStarCount)
+    : myStarCount(starCount),
+      myMaxStarCount(maxStarCount)
+{
+    starPolygon << QPointF(1.0, 0.5);
+    for (int i = 1; i < 5; ++i)
+        starPolygon << QPointF(0.5 + 0.5 * std::cos(0.8 * i * 3.14),
+                               0.5 + 0.5 * std::sin(0.8 * i * 3.14));
+
+    diamondPolygon << QPointF(0.4, 0.5) << QPointF(0.5, 0.4)
+                   << QPointF(0.6, 0.5) << QPointF(0.5, 0.6)
+                   << QPointF(0.4, 0.5);
+}
+//! [0]
+
+//! [1]
+QSize StarRating::sizeHint() const
+{
+    return PaintingScaleFactor * QSize(myMaxStarCount, 1);
+}
+//! [1]
+
+//! [2]
+void StarRating::paint(QPainter *painter, const QRect &rect,
+                       const QPalette &palette, EditMode mode) const
+{
+    painter->save();
+
+    painter->setRenderHint(QPainter::Antialiasing, true);
+    painter->setPen(Qt::NoPen);
+    painter->setBrush(mode == EditMode::Editable ?
+                          palette.highlight() :
+                          palette.windowText());
+
+    const int yOffset = (rect.height() - PaintingScaleFactor) / 2;
+    painter->translate(rect.x(), rect.y() + yOffset);
+    painter->scale(PaintingScaleFactor, PaintingScaleFactor);
+
+    for (int i = 0; i < myMaxStarCount; ++i) {
+        if (i < myStarCount)
+            painter->drawPolygon(starPolygon, Qt::WindingFill);
+        else if (mode == EditMode::Editable)
+            painter->drawPolygon(diamondPolygon, Qt::WindingFill);
+        painter->translate(1.0, 0.0);
+    }
+
+    painter->restore();
+}
+//! [2]

examples/widgets/itemviews/stardelegate/starrating.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef STARRATING_H
+#define STARRATING_H
+
+#include <QPainter>
+#include <QPolygonF>
+#include <QSize>
+
+//! [0]
+class StarRating
+{
+public:
+    enum class EditMode { Editable, ReadOnly };
+
+    explicit StarRating(int starCount = 1, int maxStarCount = 5);
+
+    void paint(QPainter *painter, const QRect &rect,
+               const QPalette &palette, EditMode mode) const;
+    QSize sizeHint() const;
+    int starCount() const { return myStarCount; }
+    int maxStarCount() const { return myMaxStarCount; }
+    void setStarCount(int starCount) { myStarCount = starCount; }
+    void setMaxStarCount(int maxStarCount) { myMaxStarCount = maxStarCount; }
+
+private:
+    QPolygonF starPolygon;
+    QPolygonF diamondPolygon;
+    int myStarCount;
+    int myMaxStarCount;
+};
+//! [0]
+
+//! [1]
+Q_DECLARE_METATYPE(StarRating)
+//! [1]
+
+#endif