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Diffstat (limited to 'doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp')
| -rw-r--r-- | doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp | 278 |
1 files changed, 0 insertions, 278 deletions
diff --git a/doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp b/doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp deleted file mode 100644 index 01df05c084..0000000000 --- a/doc/src/snippets/code/src_gui_graphicsview_qgraphicsitem.cpp +++ /dev/null @@ -1,278 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). -** Contact: http://www.qt-project.org/ -** -** This file is part of the documentation of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:BSD$ -** 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 Nokia Corporation and its Subsidiary(-ies) 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." -** -** $QT_END_LICENSE$ -** -****************************************************************************/ - -//! [0] -class SimpleItem : public QGraphicsItem -{ -public: - QRectF boundingRect() const - { - qreal penWidth = 1; - return QRectF(-10 - penWidth / 2, -10 - penWidth / 2, - 20 + penWidth, 20 + penWidth); - } - - void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, - QWidget *widget) - { - painter->drawRoundedRect(-10, -10, 20, 20, 5, 5); - } -}; -//! [0] - - -//! [1] -class CustomItem : public QGraphicsItem -{ - ... - enum { Type = UserType + 1 }; - - int type() const - { - // Enable the use of qgraphicsitem_cast with this item. - return Type; - } - ... -}; -//! [1] - - -//! [2] -item->setCursor(Qt::IBeamCursor); -//! [2] - - -//! [3] -item->setCursor(Qt::IBeamCursor); -//! [3] - - -//! [4] -QGraphicsRectItem rect; -rect.setPos(100, 100); - -rect.sceneTransform().map(QPointF(0, 0)); -// returns QPointF(100, 100); - -rect.sceneTransform().inverted().map(QPointF(100, 100)); -// returns QPointF(0, 0); -//! [4] - - -//! [5] -QGraphicsRectItem rect; -rect.setPos(100, 100); - -rect.deviceTransform(view->viewportTransform()).map(QPointF(0, 0)); -// returns the item's (0, 0) point in view's viewport coordinates - -rect.deviceTransform(view->viewportTransform()).inverted().map(QPointF(100, 100)); -// returns view's viewport's (100, 100) coordinate in item coordinates -//! [5] - - -//! [6] -// Rotate an item 45 degrees around (0, 0). -item->rotate(45); - -// Rotate an item 45 degrees around (x, y). -item->setTransform(QTransform().translate(x, y).rotate(45).translate(-x, -y)); -//! [6] - - -//! [7] -// Scale an item by 3x2 from its origin -item->scale(3, 2); - -// Scale an item by 3x2 from (x, y) -item->setTransform(QTransform().translate(x, y).scale(3, 2).translate(-x, -y)); -//! [7] - - -//! [8] -QRectF CircleItem::boundingRect() const -{ - qreal penWidth = 1; - return QRectF(-radius - penWidth / 2, -radius - penWidth / 2, - diameter + penWidth, diameter + penWidth); -} -//! [8] - - -//! [9] -QPainterPath RoundItem::shape() const -{ - QPainterPath path; - path.addEllipse(boundingRect()); - return path; -} -//! [9] - - -//! [10] -void RoundRectItem::paint(QPainter *painter, - const QStyleOptionGraphicsItem *option, - QWidget *widget) -{ - painter->drawRoundedRect(-10, -10, 20, 20, 5, 5); -} -//! [10] - - -//! [11] -static const int ObjectName = 0; - -QGraphicsItem *item = scene.itemAt(100, 50); -if (item->data(ObjectName).toString().isEmpty()) { - if (qgraphicsitem_cast<ButtonItem *>(item)) - item->setData(ObjectName, "Button"); -} -//! [11] - - -//! [12] -QGraphicsScene scene; -QGraphicsEllipseItem *ellipse = scene.addEllipse(QRectF(-10, -10, 20, 20)); -QGraphicsLineItem *line = scene.addLine(QLineF(-10, -10, 20, 20)); - -line->installSceneEventFilter(ellipse); -// line's events are filtered by ellipse's sceneEventFilter() function. - -ellipse->installSceneEventFilter(line); -// ellipse's events are filtered by line's sceneEventFilter() function. -//! [12] - - -//! [13] -void CustomItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event) -{ - QMenu menu; - QAction *removeAction = menu.addAction("Remove"); - QAction *markAction = menu.addAction("Mark"); - QAction *selectedAction = menu.exec(event->screenPos()); - // ... -} -//! [13] - - -//! [14] -CustomItem::CustomItem() -{ - setAcceptDrops(true); - ... -} - -void CustomItem::dragEnterEvent(QGraphicsSceneDragDropEvent *event) -{ - event->setAccepted(event->mimeData()->hasFormat("text/plain")); -} -//! [14] - - -//! [15] -QVariant Component::itemChange(GraphicsItemChange change, const QVariant &value) -{ - if (change == ItemPositionChange && scene()) { - // value is the new position. - QPointF newPos = value.toPointF(); - QRectF rect = scene()->sceneRect(); - if (!rect.contains(newPos)) { - // Keep the item inside the scene rect. - newPos.setX(qMin(rect.right(), qMax(newPos.x(), rect.left()))); - newPos.setY(qMin(rect.bottom(), qMax(newPos.y(), rect.top()))); - return newPos; - } - } - return QGraphicsItem::itemChange(change, value); -} -//! [15] - - -//! [16] -void CircleItem::setRadius(qreal newRadius) -{ - if (radius != newRadius) { - prepareGeometryChange(); - radius = newRadius; - } -} -//! [16] - - -//! [17] -// Group all selected items together -QGraphicsItemGroup *group = scene->createItemGroup(scene->selecteditems()); - -// Destroy the group, and delete the group item -scene->destroyItemGroup(group); -//! [17] - - -//! [QGraphicsItem type] -class CustomItem : public QGraphicsItem -{ - ... - enum { Type = UserType + 1 }; - - int type() const - { - // Enable the use of qgraphicsitem_cast with this item. - return Type; - } - ... -}; -//! [QGraphicsItem type] - -//! [18] -class QGraphicsPathItem : public QAbstractGraphicsShapeItem -{ - public: - enum { Type = 2 }; - int type() const { return Type; } - ... -}; -//! [18] - -//! [19] -QTransform xform = item->deviceTransform(view->viewportTransform()); -QRect deviceRect = xform.mapRect(rect).toAlignedRect(); -view->viewport()->scroll(dx, dy, deviceRect); -//! [19] - |