examples/demo/gradientdialog.cpp

0001 /**
0002  * Copyright (C) 2001-2015 Klaralvdalens Datakonsult AB.  All rights reserved.
0003  *
0004  * This file is part of the KD Chart library.
0005  *
0006  * This program is free software; you can redistribute it and/or
0007  * modify it under the terms of the GNU General Public License as
0008  * published by the Free Software Foundation; either version 2 of
0009  * the License, or (at your option) any later version.
0010  *
0011  * This program is distributed in the hope that it will be useful,
0012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
0013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
0014  * GNU General Public License for more details.
0015  *
0016  * You should have received a copy of the GNU General Public License
0017  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
0018  */
0019
0020 #include "gradientdialog.h"
0021 #include "ui_gradientdialog.h"
0022
0023 #include "colorslider.h"
0024
0025 #include <QHBoxLayout>
0026 #include <QVBoxLayout>
0027 #include <QSpinBox>
0028
0029 #include <QLabel>
0030
0031
0032 class GradientDialog::Private : public QObject
0033 {
0034     Q_OBJECT
0035 public:
0036     Private( GradientDialog *qq );
0037     ~Private();
0038     void init();
0039     ColorSlider *redSlider;
0040     ColorSlider *greenSlider;
0041     ColorSlider *blueSlider;
0042     QVector< QGradientStop > m_gradient;
0043     int m_currStopNr;
0044     Ui::GradientDialog *ui;
0045     GradientDialog *q;
0046 public Q_SLOTS:
0047     void changedIndex( int index );
0048     void changeStopPosition( double value );
0049     void insertItem();
0050     void deleteItem();
0051     void resetColors();
0052     void updateGradientDisplay();
0053 };
0054
0055 GradientDialog::Private::Private( GradientDialog *qq )
0056     : m_currStopNr( 2 )
0057     , ui( new Ui::GradientDialog )
0058     , q( qq )
0059 {
0060     m_gradient << qMakePair( 0.0, QColor( Qt::red ) );
0061     m_gradient << qMakePair( 1.0, QColor( Qt::blue ) );
0062 }
0063
0064 GradientDialog::Private::~Private()
0065 {
0066     delete ui;
0067 }
0068
0069 void GradientDialog::Private::changeStopPosition( double value )
0070 {
0071     m_gradient[ ui->stopSelector->currentIndex() ].first = value;
0072 }
0073
0074 void GradientDialog::Private::changedIndex( int index )
0075 {
0076     if ( index >= 0 )
0077     {
0078         ui->stopPosition->setValue( m_gradient[ index ].first );
0079         QColor stopColor = m_gradient[ index ].second;
0080         redSlider->setValue( stopColor.red() );
0081         greenSlider->setValue( stopColor.green() );
0082         blueSlider->setValue( stopColor.blue() );
0083     }
0084 }
0085
0086 void GradientDialog::Private::insertItem()
0087 {
0088     QGradientStop newStop;
0089     newStop.first = 0.5;
0090     newStop.second = Qt::white;
0091     const int index = ui->stopSelector->currentIndex() + 1;
0092     ui->stopSelector->setCurrentIndex( - 1 );
0093     m_gradient.insert( index, newStop );
0094
0095
0096     QStringList newItems;
0097     newItems << tr( "stop %1" ).arg( m_currStopNr );
0098     ui->stopSelector->insertItems( index, newItems );
0099
0100     ui->stopSelector->setCurrentIndex( index );
0101
0102     updateGradientDisplay();
0103
0104 }
0105
0106 void GradientDialog::Private::deleteItem()
0107 {
0108
0109 }
0110
0111 void GradientDialog::Private::updateGradientDisplay()
0112 {
0113     QLinearGradient gradient;
0114     gradient.setStart( 0, 0 );
0115     gradient.setStart( 1, 0 );
0116     gradient.setCoordinateMode( QGradient::ObjectBoundingMode );
0117     for ( const QGradientStop &stop : m_gradient )
0118         gradient.setColorAt( stop.first, stop.second );
0119     QPalette palette = ui->gradientDisplay->palette();
0120     palette.setBrush( QPalette::Window, gradient );
0121     ui->gradientDisplay->setPalette( palette );
0122 }
0123
0124 void GradientDialog::Private::init()
0125 {
0126     ui->setupUi( q );
0127     QStringList list; list << tr( "stop1" ) << tr( "stop2" );
0128     ui->stopSelector->addItems( list );
0129     QHBoxLayout *redLayout = new QHBoxLayout;
0130     dynamic_cast< QVBoxLayout* >( ui->gradientStopBox->layout() )->addLayout( redLayout );
0131     QLabel *redLabel = new QLabel( "R" );
0132     QFont redFont( redLabel->font() );
0133     redFont.setUnderline( true );
0134     redLabel->setFont( redFont );
0135     redLayout->addWidget( redLabel );
0136     redSlider = new ColorSlider( q );
0137     redSlider->setStartColor( Qt::black );
0138     redSlider->setEndColor( Qt::red );
0139     QSpinBox *redSpin = new QSpinBox( q );
0140     redSpin->setMinimum( 0 );
0141     redSpin->setMaximum( 255 );
0142     redSpin->setAccelerated( true );
0143     redSpin->setValue( redSlider->value() );
0144     connect( redSpin, SIGNAL(valueChanged(int)), redSlider, SLOT(setValue(int)) );
0145     connect( redSlider, SIGNAL(valueChanged(int)), redSpin, SLOT(setValue(int)) );
0146     redLayout->addWidget( redSlider );
0147     redLayout->addWidget( redSpin );
0148
0149     QHBoxLayout *greenLayout = new QHBoxLayout;
0150     dynamic_cast< QVBoxLayout* >( ui->gradientStopBox->layout() )->addLayout( greenLayout );
0151     QLabel *greenLabel = new QLabel( "G" );
0152     QFont greenFont( greenLabel->font() );
0153     greenFont.setUnderline( true );
0154     greenLabel->setFont( greenFont );
0155     greenLayout->addWidget( greenLabel );
0156     greenSlider = new ColorSlider( q );
0157     greenSlider->setStartColor( Qt::black );
0158     greenSlider->setEndColor( Qt::green );
0159     QSpinBox *greenSpin = new QSpinBox( q );
0160     greenSpin->setMinimum( 0 );
0161     greenSpin->setMaximum( 255 );
0162     greenSpin->setAccelerated( true );
0163     greenSpin->setValue( greenSlider->value() );
0164     connect( greenSpin, SIGNAL(valueChanged(int)), greenSlider, SLOT(setValue(int)) );
0165     connect( greenSlider, SIGNAL(valueChanged(int)), greenSpin, SLOT(setValue(int)) );
0166     greenLayout->addWidget( greenSlider );
0167     greenLayout->addWidget( greenSpin );
0168
0169     QHBoxLayout *blueLayout = new QHBoxLayout;
0170     dynamic_cast< QVBoxLayout* >( ui->gradientStopBox->layout() )->addLayout( blueLayout );
0171     QLabel *blueLabel = new QLabel( "B" );
0172     QFont blueFont( blueLabel->font() );
0173     blueFont.setUnderline( true );
0174     blueLabel->setFont( blueFont );
0175     blueLayout->addWidget( blueLabel );
0176     blueSlider = new ColorSlider( q );
0177     blueSlider->setStartColor( Qt::black );
0178     blueSlider->setEndColor( Qt::blue );
0179     QSpinBox *blueSpin = new QSpinBox( q );
0180     blueSpin->setMinimum( 0 );
0181     blueSpin->setMaximum( 255 );
0182     blueSpin->setAccelerated( true );
0183     blueSpin->setValue( blueSlider->value() );
0184     connect( blueSpin, SIGNAL(valueChanged(int)), blueSlider, SLOT(setValue(int)) );
0185     connect( blueSlider, SIGNAL(valueChanged(int)), blueSpin, SLOT(setValue(int)) );
0186     blueLayout->addWidget( blueSlider );
0187     blueLayout->addWidget( blueSpin );
0188
0189     updateGradientDisplay();
0190
0191     connect( redSlider, SIGNAL(valueChanged(int)), this, SLOT(resetColors()) );
0192     connect( greenSlider, SIGNAL(valueChanged(int)), this, SLOT(resetColors()) );
0193     connect( blueSlider, SIGNAL(valueChanged(int)), this, SLOT(resetColors()) );
0194
0195     connect( ui->newStop, SIGNAL(clicked()), this, SLOT(insertItem()) );
0196     connect( ui->deleteStop, SIGNAL(clicked()), this, SLOT(deleteItem()) );
0197     connect( ui->stopSelector, SIGNAL(currentIndexChanged(int)), this, SLOT(changedIndex(int)) );
0198
0199     connect( ui->stopPosition, SIGNAL(valueChanged(double)), this, SLOT(changeStopPosition(double)) );
0200 }
0201
0202 GradientDialog::GradientDialog( QWidget *parent )
0203     : QDialog( parent )
0204     , d( new Private( this ) )
0205 {
0206     d->init();
0207 }
0208
0209 GradientDialog::~GradientDialog()
0210 {
0211     delete d;
0212 }
0213
0214 void GradientDialog::Private::resetColors()
0215 {
0216     const int red = redSlider->value();
0217     const int green = greenSlider->value();
0218     const int blue = blueSlider->value();
0219     QColor redSliderStartColor( 0, green, blue );
0220     QColor redSliderStopColor( 255, green, blue );
0221     redSlider->setStartColor( redSliderStartColor );
0222     redSlider->setEndColor( redSliderStopColor );
0223     m_gradient[ ui->stopSelector->currentIndex() ].second.setRed( red );
0224
0225     QColor greenSliderStartColor( red, 0, blue );
0226     QColor greenSliderStopColor( red, 255, blue );
0227     greenSlider->setStartColor( greenSliderStartColor );
0228     greenSlider->setEndColor( greenSliderStopColor );
0229     m_gradient[ ui->stopSelector->currentIndex() ].second.setGreen( green );
0230
0231     QColor blueSliderStartColor( red, green, 0 );
0232     QColor blueSliderStopColor( red, green, 255 );
0233     blueSlider->setStartColor( blueSliderStartColor );
0234     blueSlider->setEndColor( blueSliderStopColor );
0235     m_gradient[ ui->stopSelector->currentIndex() ].second.setBlue( blue );
0236
0237     updateGradientDisplay();
0238
0239 }
0240
0241 QGradient GradientDialog::gradient() const
0242 {
0243     QLinearGradient gradient;
0244     gradient.setStart( 0, 0 );
0245     gradient.setStart( 1, 0 );
0246     gradient.setCoordinateMode( QGradient::ObjectBoundingMode );
0247     for ( const QGradientStop &stop : d->m_gradient )
0248         gradient.setColorAt( stop.first, stop.second );
0249     return gradient;
0250 }
0251 void GradientDialog::setGradient( const QGradient &gradient )
0252 {
0253     d->m_gradient.clear();
0254     d->ui->stopSelector->clear();
0255     const QGradientStops stops = gradient.stops();
0256     for ( const QGradientStop &stop : stops )
0257     {
0258         d->m_gradient.append( stop );
0259     }
0260     QStringList newEntries;
0261     for ( int i = 0; i < stops.count(); ++i )
0262         newEntries << tr( "stop %1" ).arg( i );
0263     d->ui->stopSelector->addItems( newEntries );
0264     d->m_currStopNr = newEntries.count();
0265     d->updateGradientDisplay();
0266 }
0267
0268 QGradient GradientDialog::getGradient( const QGradient &gradient, QWidget *parent, const QString &title )
0269 {
0270     GradientDialog dialog( parent );
0271     dialog.setGradient( gradient );
0272     dialog.setWindowTitle( title );
0273     dialog.exec();
0274     return dialog.gradient();
0275 }
0276
0277 #include "gradientdialog.moc"