Doc: Make snippets Qt Widgets compilable

Removed mainwindowsnippet.cpp and widgetdelegate.cpp
from snippets.pro

Task-number: QTBUG-81497
Change-Id: I40d1f34e64d958d2fb857dc8e468b9c40fff527c
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>

src/widgets/doc/snippets/customviewstyle.cpp

@@ -50,11 +50,10 @@
 
 #include <QtWidgets>
 
-#include "customviewstyle.h"
+#include "./customstyle/customstyle.h"
 
-
-
-void CustomViewStyle::drawPrimitive(PrimitiveElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget) const
+void CustomStyle::drawPrimitive(PrimitiveElement element, const QStyleOption *option,
+                                QPainter *painter, const QWidget *widget) const
 {
 
 //![0]

src/widgets/doc/snippets/filedialogurls.cpp

@@ -49,11 +49,10 @@
 ****************************************************************************/
 
 #include <QtGui>
+#include <QFileDialog>
 
-int main(int argv, char **args)
+int loadFileDialog()
 {
-    QApplication app(argv, args);
-
 //![0]
     QList<QUrl> urls;
     urls << QUrl::fromLocalFile("/Users/foo/Code/qt5")
@@ -66,6 +65,5 @@ int main(int argv, char **args)
         // ...
     }
 //![0]
-
-    return app.exec();
+    return 1;
 }

src/widgets/doc/snippets/graphicssceneadditemsnippet.cpp

@@ -49,6 +49,9 @@
 ****************************************************************************/
 
 #include <QtGui>
+#include <QGraphicsScene>
+#include <QGraphicsEllipseItem>
+#include <QStyleOptionGraphicsItem>
 
 class CustomScene : public QGraphicsScene
 {
@@ -70,21 +73,9 @@ void CustomScene::drawItems(QPainter *painter, int numItems,
     for (int i = 0; i < numItems; ++i) {
          // Draw the item
          painter->save();
-         painter->setMatrix(items[i]->sceneMatrix(), true);
+         painter->setTransform(items[i]->sceneTransform(), true);
          items[i]->paint(painter, &options[i], widget);
          painter->restore();
      }
 }
 //! [0]
-
-int main(int argv, char **args)
-{
-    QApplication app(argv, args);
-
-    CustomScene scene;
-    QGraphicsView view(&scene);
-
-    view.show();
-
-    return app.exec();
-}

src/widgets/doc/snippets/graphicsview.cpp

@@ -47,53 +47,70 @@
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/
+#include <QGraphicsView>
+#include <QOpenGLWidget>
+#include <QPrinter>
+#include <QPrintDialog>
+#include <QStandardItem>
+#include <QMimeData>
+#include <QDrag>
+#include <QGraphicsSceneMouseEvent>
 
+int main()
+{
 //! [0]
 QGraphicsScene scene;
 QGraphicsRectItem *rect = scene.addRect(QRectF(0, 0, 100, 100));
 
-QGraphicsItem *item = scene.itemAt(50, 50);
-// item == rect
+QGraphicsItem *item = scene.itemAt(50, 50, QTransform());
 //! [0]
+Q_UNUSED(rect);
+Q_UNUSED(item);
+}
 
+void myPopulateScene(QGraphicsScene *)
+{
+    // Intentionally left empty
+}
 
+void snippetThatUsesMyPopulateScene()
+{
 //! [1]
 QGraphicsScene scene;
 myPopulateScene(&scene);
-
 QGraphicsView view(&scene);
 view.show();
 //! [1]
+}
 
-
-//! [2]
-class View : public QGraphicsView
+class CustomItem : public QStandardItem
 {
-Q_OBJECT
-    ...
-public slots:
-    void zoomIn() { scale(1.2, 1.2); }
-    void zoomOut() { scale(1 / 1.2, 1 / 1.2); }
-    void rotateLeft() { rotate(-10); }
-    void rotateRight() { rotate(10); }
-    ...
+public:
+    using QStandardItem::QStandardItem;
+
+    int type() const override { return UserType; }
+    void mousePressEvent(QGraphicsSceneMouseEvent *event);
+    QStandardItem *clone() const override { return new CustomItem; }
 };
-//! [2]
 
 
+void printScene()
+{
 //! [3]
 QGraphicsScene scene;
+QPrinter printer;
 scene.addRect(QRectF(0, 0, 100, 200), QPen(Qt::black), QBrush(Qt::green));
 
-QPrinter printer;
 if (QPrintDialog(&printer).exec() == QDialog::Accepted) {
     QPainter painter(&printer);
     painter.setRenderHint(QPainter::Antialiasing);
     scene.render(&painter);
 }
 //! [3]
+}
 
-
+void pixmapScene()
+{
 //! [4]
 QGraphicsScene scene;
 scene.addRect(QRectF(0, 0, 100, 200), QPen(Qt::black), QBrush(Qt::green));
@@ -106,21 +123,21 @@ painter.end();
 
 pixmap.save("scene.png");
 //! [4]
-
+}
 
 //! [5]
 void CustomItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
 {
     QMimeData *data = new QMimeData;
-    data->setColor(Qt::green);
-
     QDrag *drag = new QDrag(event->widget());
     drag->setMimeData(data);
-    drag->start();
+    drag->exec();
 }
 //! [5]
 
-
+void viewScene()
+{
+QGraphicsScene scene;
 //! [6]
 QGraphicsView view(&scene);
 QOpenGLWidget *gl = new QOpenGLWidget();
@@ -129,3 +146,4 @@ format.setSamples(4);
 gl->setFormat(format);
 view.setViewport(gl);
 //! [6]
+}

src/widgets/doc/snippets/graphicsview_snippet.cpp

@@ -0,0 +1,63 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [2]
+class View : public QGraphicsView
+{
+Q_OBJECT
+    ...
+public slots:
+    void zoomIn() { scale(1.2, 1.2); }
+    void zoomOut() { scale(1 / 1.2, 1 / 1.2); }
+    void rotateLeft() { rotate(-10); }
+    void rotateRight() { rotate(10); }
+    ...
+};
+//! [2]

src/widgets/doc/snippets/mdiareasnippets.cpp

@@ -85,6 +85,7 @@ void addingSubWindowsExample()
     mdiArea.show();
 }
 
+/*
 int main(int argv, char **args)
 {
     QApplication app(argv, args);
@@ -103,5 +104,5 @@ int main(int argv, char **args)
 
     return app.exec();
 }
-
+*/
 

src/widgets/doc/snippets/myscrollarea.cpp

@@ -48,7 +48,7 @@
 **
 ****************************************************************************/
 
-#include <QtGui>
+#include <QtWidgets>
 
 class MyScrollArea : public QAbstractScrollArea
 {
@@ -97,8 +97,10 @@ void MyScrollArea::updateWidgetPosition()
 //! [0]
 }
 
-void MyScrollArea::scrollContentsBy(int /*dx*/, int /*dy*/)
+void MyScrollArea::scrollContentsBy(int dx, int dy)
 {
+    Q_UNUSED(dx);
+    Q_UNUSED(dy);
     updateWidgetPosition();
 }
 
@@ -118,21 +120,6 @@ void MyScrollArea::updateArea()
 
 void MyScrollArea::resizeEvent(QResizeEvent *event)
 {
+    Q_UNUSED(event);
     updateArea();
 }
-
-int main(int argv, char **args)
-{
-    QApplication app(argv, args);
-
-    QPixmap pixmap("mypixmap.png");
-    QLabel label;
-    label.setPixmap(pixmap);
-    MyScrollArea area(&label);
-    area.resize(300, 300);
-    area.show();
-
-    area.setWidget(&label);
-
-    return app.exec();
-}

src/widgets/doc/snippets/snippets.pro

@@ -0,0 +1,16 @@
+requires(qtHaveModule(widgets))
+requires(qtHaveModule(printsupport))
+
+TEMPLATE = app
+
+TARGET = widgets_snippets
+
+QT += widgets printsupport
+
+SOURCES += customviewstyle.cpp \
+           filedialogurls.cpp \
+           graphicssceneadditemsnippet.cpp \
+           graphicsview.cpp \
+           mdiareasnippets.cpp \
+           myscrollarea.cpp
+

src/widgets/doc/src/graphicsview.qdoc

@@ -327,7 +327,7 @@
         Here is an example of how to implement zoom and rotate slots in a
         subclass of QGraphicsView:
 
-        \snippet graphicsview.cpp 2
+        \snippet graphicsview_snippet.cpp 2
 
         The slots could be connected to \l{QToolButton}{QToolButtons} with
         \l{QAbstractButton::autoRepeat}{autoRepeat} enabled.