main.cpp Example File

graphicsview/weatheranchorlayout/main.cpp
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples 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."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <QApplication>
#include <QLabel>
#include <QPainter>
#include <QPushButton>

#include <QGraphicsAnchorLayout>
#include <QGraphicsProxyWidget>
#include <QGraphicsScene>
#include <QGraphicsSceneResizeEvent>
#include <QGraphicsView>
#include <QGraphicsWidget>

class GraphicsView : public QGraphicsView
{
public:
    GraphicsView(QGraphicsScene *scene, QGraphicsWidget *widget)
        : QGraphicsView(scene), w(widget)
    {
    }

    void resizeEvent(QResizeEvent *event) override
    {
        w->setGeometry(0, 0, event->size().width(), event->size().height());
    }

    QGraphicsWidget *w;
};

class PixmapWidget : public QGraphicsLayoutItem
{

public:
    PixmapWidget(const QPixmap &pix)
        : QGraphicsLayoutItem()
    {
        original = new QGraphicsPixmapItem(pix);
        setGraphicsItem(original);
        original->show();
        r = QRectF(QPointF(0, 0), pix.size());
    }

    ~PixmapWidget()
    {
        setGraphicsItem(0);
        delete original;
    }

    void setZValue(qreal z)
    {
        original->setZValue(z);
    }

    void setGeometry (const QRectF &rect) override
    {
        original->setTransform(QTransform::fromScale(rect.width() / r.width(),
                                                     rect.height() / r.height()), true);
        original->setPos(rect.x(), rect.y());
        r = rect;
    }

protected:
    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const override
    {
        Q_UNUSED(constraint);
        QSizeF sh;
        switch (which) {
            case Qt::MinimumSize:
                sh = QSizeF(0, 0);
                break;
            case Qt::PreferredSize:
                sh = QSizeF(50, 50);
                break;
            case Qt::MaximumSize:
                sh = QSizeF(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
                break;
            default:
                break;
        }
        return sh;
    }

private:
    QGraphicsPixmapItem *original;
    QRectF r;
};

class PlaceWidget : public QGraphicsWidget
{
    Q_OBJECT

public:
    PlaceWidget(const QPixmap &pix)
        : QGraphicsWidget()
        , original(pix)
        , scaled(pix)
    {
    }

    void paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *) override
    {
        QPointF reflection = QPointF();
        reflection.setY(scaled.height() + 2);

        painter->drawPixmap(QPointF(), scaled);

        QPixmap tmp(scaled.size());
        tmp.fill(Qt::transparent);
        QPainter p(&tmp);

        // create gradient
        QPoint p1(scaled.width() / 2, 0);
        QPoint p2(scaled.width() / 2, scaled.height());
        QLinearGradient linearGrad(p1, p2);
        linearGrad.setColorAt(0, QColor(0, 0, 0, 0));
        linearGrad.setColorAt(0.65, QColor(0, 0, 0, 127));
        linearGrad.setColorAt(1, QColor(0, 0, 0, 255));

        // apply 'mask'
        p.setBrush(linearGrad);
        p.fillRect(0, 0, tmp.width(), tmp.height(), QBrush(linearGrad));
        p.fillRect(0, 0, tmp.width(), tmp.height(), QBrush(linearGrad));

        // paint the image flipped
        p.setCompositionMode(QPainter::CompositionMode_DestinationOver);
        p.drawPixmap(0, 0, QPixmap::fromImage(scaled.toImage().mirrored(false, true)));
        p.end();

        painter->drawPixmap(reflection, tmp);
    }

    void resizeEvent(QGraphicsSceneResizeEvent *event) override
    {
        QSize newSize = event->newSize().toSize();
        newSize.setHeight(newSize.height() / 2);
        scaled = original.scaled(newSize);
    }

    QRectF boundingRect() const override
    {
        QSize size(scaled.width(), scaled.height() * 2 + 2);
        return QRectF(QPointF(0, 0), size);
    }

private:
    QPixmap original;
    QPixmap scaled;
};

int main(int argc, char *argv[])
{
    Q_INIT_RESOURCE(weatheranchorlayout);

    QApplication app(argc, argv);

    QGraphicsScene scene;
    scene.setSceneRect(0, 0, 800, 480);

    // pixmaps widgets
    PixmapWidget *title = new PixmapWidget(QPixmap(":/images/title.jpg"));
    PlaceWidget *place = new PlaceWidget(QPixmap(":/images/place.jpg"));
    PixmapWidget *details = new PixmapWidget(QPixmap(":/images/5days.jpg"));
    PixmapWidget *sunnyWeather = new PixmapWidget(QPixmap(":/images/weather-few-clouds.png"));
    PixmapWidget *tabbar = new PixmapWidget(QPixmap(":/images/tabbar.jpg"));

    // setup sizes
    title->setPreferredSize(QSizeF(348, 45));
    title->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);

    place->setPreferredSize(QSizeF(96, 72));
    place->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);

    details->setMinimumSize(QSizeF(200, 112));
    details->setPreferredSize(QSizeF(200, 112));
    details->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);

    tabbar->setPreferredSize(QSizeF(70, 24));
    tabbar->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);

    sunnyWeather->setPreferredSize(QSizeF(128, 97));
    sunnyWeather->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
    sunnyWeather->setZValue(9999);

    // start anchor layout
    QGraphicsAnchorLayout *layout = new QGraphicsAnchorLayout;
    layout->setSpacing(0);

    // setup the main widget
    QGraphicsWidget *widget = new QGraphicsWidget(0, Qt::Window);
    QPalette p;
    p.setColor(QPalette::Window, Qt::black);
    widget->setPalette(p);
    widget->setPos(20, 20);
    widget->setLayout(layout);

    // vertical anchors
    QGraphicsAnchor *anchor = layout->addAnchor(title, Qt::AnchorTop, layout, Qt::AnchorTop);
    anchor = layout->addAnchor(place, Qt::AnchorTop, title, Qt::AnchorBottom);
    anchor->setSpacing(12);
    anchor = layout->addAnchor(place, Qt::AnchorBottom, layout, Qt::AnchorBottom);
    anchor->setSpacing(12);

    anchor = layout->addAnchor(sunnyWeather, Qt::AnchorTop, title, Qt::AnchorTop);
    anchor = layout->addAnchor(sunnyWeather, Qt::AnchorBottom, layout, Qt::AnchorVerticalCenter);

    anchor = layout->addAnchor(tabbar, Qt::AnchorTop, title, Qt::AnchorBottom);
    anchor->setSpacing(5);
    anchor = layout->addAnchor(details, Qt::AnchorTop, tabbar, Qt::AnchorBottom);
    anchor->setSpacing(2);
    anchor = layout->addAnchor(details, Qt::AnchorBottom, layout, Qt::AnchorBottom);
    anchor->setSpacing(12);

    // horizontal anchors
    anchor = layout->addAnchor(layout, Qt::AnchorLeft, title, Qt::AnchorLeft);
    anchor = layout->addAnchor(title, Qt::AnchorRight, layout, Qt::AnchorRight);

    anchor = layout->addAnchor(place, Qt::AnchorLeft, layout, Qt::AnchorLeft);
    anchor->setSpacing(15);
    anchor = layout->addAnchor(place, Qt::AnchorRight, details, Qt::AnchorLeft);
    anchor->setSpacing(35);

    anchor = layout->addAnchor(sunnyWeather, Qt::AnchorLeft, place, Qt::AnchorHorizontalCenter);
    anchor = layout->addAnchor(sunnyWeather, Qt::AnchorRight, layout, Qt::AnchorHorizontalCenter);

    anchor = layout->addAnchor(tabbar, Qt::AnchorHorizontalCenter, details, Qt::AnchorHorizontalCenter);
    anchor = layout->addAnchor(details, Qt::AnchorRight, layout, Qt::AnchorRight);

    // QGV setup
    scene.addItem(widget);
    scene.setBackgroundBrush(Qt::white);
    QGraphicsView *view = new QGraphicsView(&scene);
    view->show();

    return app.exec();
}

#include "main.moc"

© 2017 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.