qskinny/examples/thumbnails/main.cpp

/******************************************************************************
 * QSkinny - Copyright (C) 2016 Uwe Rathmann
 * This file may be used under the terms of the 3-clause BSD License
 *****************************************************************************/

#include <SkinnyShortcut.h>
#include <SkinnyShapeFactory.h>

#include <QskScrollArea.h>
#include <QskWindow.h>
#include <QskGraphicLabel.h>
#include <QskLinearBox.h>
#include <QskObjectCounter.h>
#include <QskGraphic.h>
#include <QskBoxBorderMetrics.h>
#include <QskBoxShapeMetrics.h>
#include <QskAspect.h>

#include <QGuiApplication>
#include <QPainter>

const int gridSize = 20;
const int thumbnailSize = 150;

static QColor randomColor()
{
    static const char* colors[] =
    {
        "HotPink",
        "MediumVioletRed",
        "FireBrick",
        "PeachPuff",
        "Gold",
        "RosyBrown",
        "Maroon",
        "Turquoise",
        "CadetBlue",
        "Teal",
        "LightSteelBlue",
        "CornflowerBlue",
        "Thistle",
        "Plum",
        "DarkViolet",
        "DarkSlateBlue",
        "AntiqueWhite",
        "MistyRose",
        "Silver",
        "DarkSlateGray"
    };

    const int index = qrand() % ( sizeof( colors ) / sizeof( colors[0] ) );
    return QColor( colors[ index ] );
}

static int randomShape()
{
    return qrand() % SkinnyShapeFactory::ShapeCount;
}

class Thumbnail : public QskGraphicLabel
{
public:
    Thumbnail( const QColor& color, int shape, QQuickItem* parentItem ):
        QskGraphicLabel( parentItem )
    {
        using namespace SkinnyShapeFactory;

        const QSizeF size( thumbnailSize, thumbnailSize );

        QskGraphic graphic;

        QPen pen( Qt::black, 3 );
        pen.setJoinStyle( Qt::MiterJoin );
        pen.setCosmetic( true );

        QPainter painter( &graphic );
        painter.setRenderHint( QPainter::Antialiasing, true );
        painter.setPen( pen );
        painter.setBrush( color );

        painter.drawPath( shapePath( static_cast< Shape >( shape ), size ) );
        painter.end();

        setGraphic( graphic );
        setFixedSize( size );
    }
};

class IconGrid : public QskLinearBox
{
public:
    IconGrid( QQuickItem* parentItem = nullptr ):
        QskLinearBox( Qt::Horizontal, gridSize, parentItem )
    {
        setMargins( 20 );
        setSpacing( 20 );

        for ( int col = 0; col < gridSize; col++ )
        {
            for ( int row = 0; row < gridSize; row++ )
                (void) new Thumbnail( randomColor(), randomShape(), this );
        }
    }
};

class ScrollArea : public QskScrollArea
{
public:
    ScrollArea( QQuickItem* parentItem = nullptr ) :
        QskScrollArea( parentItem )
    {
        using namespace QskAspect;

        // settings usually done in the skins
        setBoxBorderMetricsHint( Viewport, 2 );
        setBoxShapeHint( Viewport, 20 );

        for ( auto subControl : { HorizontalScrollBar, VerticalScrollBar } )
            setMetric( subControl | Size, 20 );

        setBoxBorderMetricsHint( VerticalScrollHandle, 1 );
        setBoxShapeHint( VerticalScrollHandle, 8 );

        setBoxBorderMetricsHint( HorizontalScrollHandle, 1 );
        setBoxShapeHint( HorizontalScrollHandle, 8 );
    }
};

int main( int argc, char* argv[] )
{
#ifdef ITEM_STATISTICS
    QskObjectCounter counter( true );
#endif

    QGuiApplication app( argc, argv );

    SkinnyShortcut::enable( SkinnyShortcut::AllShortcuts );

    /*
        In a real world application a thumbnail viewer would probably be implemented
        with QskScrollView using scene graph node composition - like done
        with QskListView.

        This example also shows, that blocking of the scene graph node creation
        ( QskControl::DeferredUpdate + QskControl::CleanupOnVisibility ) 
        could be improved to also respect being inside the window or a clip region.

        But here we only want to demonstrate how QskScrollArea works.
     */

    auto scrollArea = new ScrollArea();
    scrollArea->setMargins( QMarginsF( 25, 25, 5, 5 ) );
    scrollArea->setScrolledItem( new IconGrid() );

    QskWindow window;
    window.resize( 600, 600 );
    window.setColor( "SteelBlue" );
    window.addItem( scrollArea );

    window.show();

    return app.exec();
}