qtcolorline.cpp

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#include <QPainter>
#include <QPaintEvent>
#include <QStyleOption>
#include "qtcolorline.h"
#include "qdrawutil.h"

#include "qdebug.h"

using namespace qdesigner_internal;

namespace qdesigner_internal {

class QtColorLinePrivate
{
    QtColorLine *q_ptr;
    Q_DECLARE_PUBLIC(QtColorLine)
public:
    QtColorLinePrivate();

    QColor color() const;
    void setColor(const QColor &color);

    QtColorLine::ColorComponent colorComponent() const;
    void setColorComponent(QtColorLine::ColorComponent component);

    void setIndicatorSize(int size);
    int indicatorSize() const;

    void setIndicatorSpace(int space);
    int indicatorSpace() const;

    void setFlip(bool flip);
    bool flip() const;

    void setBackgroundTransparent(bool transparent);
    bool backgroundTransparent() const;

    void setOrientation(Qt::Orientation orientation);
    Qt::Orientation orientation() const;

    void resizeEvent(QResizeEvent *event);
    void paintEvent(QPaintEvent *event);
    void mousePressEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
    void mouseReleaseEvent(QMouseEvent *event);
private:
    void checkColor();
    bool isMainPixmapValid() const;
    void validate();
    void recreateMainPixmap();
    QSize pixmapSizeFromGeometrySize(const QSize &geometrySize) const;
    QPixmap gradientPixmap(int size, Qt::Orientation orientation, const QColor &begin, const QColor &end, bool flipped = false) const;
    QPixmap gradientPixmap(Qt::Orientation orientation, const QColor &begin, const QColor &end, bool flipped = false) const;
    QPixmap hueGradientPixmap(int size, Qt::Orientation orientation, bool flipped = false,
                int saturation = 0xFF, int value = 0xFF, int alpha = 0xFF) const;
    QPixmap hueGradientPixmap(Qt::Orientation orientation, bool flipped = false,
                int saturation = 0xFF, int value = 0xFF, int alpha = 0xFF) const;

    QVector<QRect> rects(const QPointF &point) const;

    QColor colorFromPoint(const QPointF &point) const;
    QPointF pointFromColor(const QColor &color) const;

    QColor m_color;
    QtColorLine::ColorComponent m_component;
    bool m_flipped;
    bool m_backgroundTransparent;
    Qt::Orientation m_orientation;
    bool m_dragging;
    int m_indicatorSize;
    int m_indicatorSpace;
    QPointF m_point;
    QPoint m_clickOffset;

    QPixmap m_mainPixmap;
    QSize m_pixmapSize;

    struct PixData {
        QSize size;
        QColor color;
        QtColorLine::ColorComponent component;
        bool flipped;
        Qt::Orientation orientation;
    };

    PixData m_lastValidMainPixmapData;
};

}

QtColorLinePrivate::QtColorLinePrivate()
    : m_color(Qt::black), m_component(QtColorLine::Value),
        m_flipped(false), m_backgroundTransparent(true), m_orientation(Qt::Horizontal), m_dragging(false)
{
    m_indicatorSize = 22;
    m_indicatorSpace = 0;
    m_pixmapSize = QSize(0, 0);
    m_point = pointFromColor(m_color);
}

void QtColorLinePrivate::setColor(const QColor &color)
{
    if (m_color == color)
        return;
    if (!color.isValid())
        return;
    if (m_dragging) // Warning perhaps here, recursive call
        return;
    m_color = color;
    checkColor();
    QColor c = colorFromPoint(m_point);
    m_point = pointFromColor(m_color);
    q_ptr->update();
}

QColor QtColorLinePrivate::color() const
{
    return m_color;
}

void QtColorLinePrivate::setColorComponent(QtColorLine::ColorComponent component)
{
    if (m_component == component)
        return;
    if (m_dragging) // Warning perhaps here, recursive call
        return;
    m_component = component;
    checkColor();
    m_point = pointFromColor(m_color);
    q_ptr->update();
}

QtColorLine::ColorComponent QtColorLinePrivate::colorComponent() const
{
    return m_component;
}

void QtColorLinePrivate::setIndicatorSize(int size)
{
    if (size <= 0)
        return;
    if (m_dragging) // Warning perhaps here, recursive call
        return;
    if (m_indicatorSize == size)
        return;
    m_indicatorSize = size;
    m_pixmapSize = pixmapSizeFromGeometrySize(q_ptr->contentsRect().size());
    q_ptr->update();
    q_ptr->updateGeometry();
}

int QtColorLinePrivate::indicatorSize() const
{
    return m_indicatorSize;
}

void QtColorLinePrivate::setIndicatorSpace(int space)
{
    if (space < 0)
        return;
    if (m_dragging) // Warning perhaps here, recursive call
        return;
    if (m_indicatorSpace == space)
        return;
    m_indicatorSpace = space;
    m_pixmapSize = pixmapSizeFromGeometrySize(q_ptr->contentsRect().size());
    q_ptr->update();
}

int QtColorLinePrivate::indicatorSpace() const
{
    return m_indicatorSpace;
}

void QtColorLinePrivate::setFlip(bool flip)
{
    if (m_dragging) // Warning perhaps here, recursive call
        return;
    if (m_flipped == flip)
        return;
    m_flipped = flip;
    m_point = pointFromColor(m_color);
    q_ptr->update();
}

bool QtColorLinePrivate::flip() const
{
    return m_flipped;
}

void QtColorLinePrivate::setBackgroundTransparent(bool transparent)
{
    if (m_backgroundTransparent == transparent)
        return;
    m_backgroundTransparent = transparent;
    q_ptr->update();
}

bool QtColorLinePrivate::backgroundTransparent() const
{
    return m_backgroundTransparent;
}

void QtColorLinePrivate::setOrientation(Qt::Orientation orientation)
{
    if (m_dragging) // Warning perhaps here, recursive call
        return;
    if (m_orientation == orientation)
        return;

    m_orientation = orientation;
    if (!q_ptr->testAttribute(Qt::WA_WState_OwnSizePolicy)) {
        QSizePolicy sp = q_ptr->sizePolicy();
        sp.transpose();
        q_ptr->setSizePolicy(sp);
        q_ptr->setAttribute(Qt::WA_WState_OwnSizePolicy, false);
    }
    m_point = pointFromColor(m_color);
    q_ptr->update();
    q_ptr->updateGeometry();
}

Qt::Orientation QtColorLinePrivate::orientation() const
{
    return m_orientation;
}

void QtColorLinePrivate::checkColor()
{
    switch (m_component) {
        case QtColorLine::Red:
        case QtColorLine::Green:
        case QtColorLine::Blue:
            if (m_color.spec() != QColor::Rgb)
                m_color = m_color.toRgb();
            break;
        case QtColorLine::Hue:
        case QtColorLine::Saturation:
        case QtColorLine::Value:
            if (m_color.spec() != QColor::Hsv)
                m_color = m_color.toHsv();
            break;
        default:
            break;
    }
    if (m_color.spec() == QColor::Hsv) {
        if (m_color.hue() == 360 || m_color.hue() == -1) {
            m_color.setHsvF(0.0, m_color.saturationF(), m_color.valueF(), m_color.alphaF());
        }
    }
}

bool QtColorLinePrivate::isMainPixmapValid() const
{
    if (m_mainPixmap.isNull()) {
        if (m_pixmapSize.isEmpty())
            return true;
        else
            return false;
    }
    if (m_lastValidMainPixmapData.component != m_component)
        return false;
    if (m_lastValidMainPixmapData.size != m_pixmapSize)
        return false;
    if (m_lastValidMainPixmapData.flipped != m_flipped)
        return false;
    if (m_lastValidMainPixmapData.orientation != m_orientation)
        return false;
    if (m_lastValidMainPixmapData.color == m_color)
        return true;
    switch (m_component) {
        case QtColorLine::Red:
            if (m_color.green() == m_lastValidMainPixmapData.color.green() &&
                m_color.blue() == m_lastValidMainPixmapData.color.blue() &&
                m_color.alpha() == m_lastValidMainPixmapData.color.alpha())
                return true;
            break;
        case QtColorLine::Green:
            if (m_color.red() == m_lastValidMainPixmapData.color.red() &&
                m_color.blue() == m_lastValidMainPixmapData.color.blue() &&
                m_color.alpha() == m_lastValidMainPixmapData.color.alpha())
                return true;
            break;
        case QtColorLine::Blue:
            if (m_color.red() == m_lastValidMainPixmapData.color.red() &&
                m_color.green() == m_lastValidMainPixmapData.color.green() &&
                m_color.alpha() == m_lastValidMainPixmapData.color.alpha())
                return true;
            break;
        case QtColorLine::Hue:
            if (m_color.saturation() == m_lastValidMainPixmapData.color.saturation() &&
                m_color.value() == m_lastValidMainPixmapData.color.value() &&
                m_color.alpha() == m_lastValidMainPixmapData.color.alpha())
                return true;
            break;
        case QtColorLine::Saturation:
            if (m_color.hue() == m_lastValidMainPixmapData.color.hue() &&
                m_color.value() == m_lastValidMainPixmapData.color.value() &&
                m_color.alpha() == m_lastValidMainPixmapData.color.alpha())
                return true;
            break;
        case QtColorLine::Value:
            if (m_color.hue() == m_lastValidMainPixmapData.color.hue() &&
                m_color.saturation() == m_lastValidMainPixmapData.color.saturation() &&
                m_color.alpha() == m_lastValidMainPixmapData.color.alpha())
                return true;
            break;
        case QtColorLine::Alpha:
            if (m_color.hue() == m_lastValidMainPixmapData.color.hue() &&
                m_color.saturation() == m_lastValidMainPixmapData.color.saturation() &&
                m_color.value() == m_lastValidMainPixmapData.color.value())
                return true;
    }
    return false;
}

void QtColorLinePrivate::validate()
{
    recreateMainPixmap();
}

QPixmap QtColorLinePrivate::gradientPixmap(Qt::Orientation orientation, const QColor &begin, const QColor &end, bool flipped) const
{
    int size = m_pixmapSize.width();
    if (orientation == Qt::Vertical)
        size = m_pixmapSize.height();
    return gradientPixmap(size, orientation, begin, end, flipped);
}

QPixmap QtColorLinePrivate::gradientPixmap(int size, Qt::Orientation orientation,
            const QColor &begin, const QColor &end, bool flipped) const
{
    int gradW = size;
    int gradH = size;
    int w = size;
    int h = size;
    if (orientation == Qt::Horizontal) {
        gradH = 0;
        h = 1;
    } else {
        gradW = 0;
        w = 1;
    }
    QColor c1 = begin;
    QColor c2 = end;
    if (flipped) {
        c1 = end;
        c2 = begin;
    }
    QLinearGradient lg(0, 0, gradW, gradH);
    lg.setColorAt(0, c1);
    lg.setColorAt(1, c2);
    QImage img(w, h, QImage::Format_ARGB32_Premultiplied);
    QPainter p(&img);
    p.setCompositionMode(QPainter::CompositionMode_Source);
    p.fillRect(QRect(0, 0, w, h), lg);
    return QPixmap::fromImage(img);
}

QPixmap QtColorLinePrivate::hueGradientPixmap(Qt::Orientation orientation, bool flipped,
                int saturation, int value, int alpha) const
{
    int size = m_pixmapSize.width();
    if (orientation == Qt::Vertical)
        size = m_pixmapSize.height();
    return hueGradientPixmap(size, orientation, flipped, saturation, value, alpha);
}

QPixmap QtColorLinePrivate::hueGradientPixmap(int size, Qt::Orientation orientation, bool flipped,
                int saturation, int value, int alpha) const
{
    int gradW = size + 1;
    int gradH = size + 1;
    int w = size;
    int h = size;
    if (orientation == Qt::Horizontal) {
        gradH = 0;
        h = 1;
    } else {
        gradW = 0;
        w = 1;
    }
    QList<QColor> colorList;
    colorList << QColor::fromHsv(0, saturation, value, alpha);
    colorList << QColor::fromHsv(60, saturation, value, alpha);
    colorList << QColor::fromHsv(120, saturation, value, alpha);
    colorList << QColor::fromHsv(180, saturation, value, alpha);
    colorList << QColor::fromHsv(240, saturation, value, alpha);
    colorList << QColor::fromHsv(300, saturation, value, alpha);
    colorList << QColor::fromHsv(0, saturation, value, alpha);
    QLinearGradient lg(0, 0, gradW, gradH);
    for (int i = 0; i <= 6; i++)
        lg.setColorAt((double)i / 6.0, flipped ? colorList.at(6 - i) : colorList.at(i));
    QImage img(w, h, QImage::Format_ARGB32_Premultiplied);
    QPainter p(&img);
    p.setCompositionMode(QPainter::CompositionMode_Source);
    p.fillRect(QRect(0, 0, w, h), lg);
    return QPixmap::fromImage(img);
}

void QtColorLinePrivate::recreateMainPixmap()
{
    if (isMainPixmapValid())
        return;

    m_lastValidMainPixmapData.size = m_pixmapSize;
    m_lastValidMainPixmapData.component = m_component;
    m_lastValidMainPixmapData.color = m_color;
    m_lastValidMainPixmapData.flipped = m_flipped;
    m_lastValidMainPixmapData.orientation = m_orientation;

    if (m_pixmapSize.isEmpty()) {
        m_mainPixmap = QPixmap();
        return;
    }

    if (m_mainPixmap.size() != m_pixmapSize)
        m_mainPixmap = QPixmap(m_pixmapSize);

    Qt::Orientation orient = m_orientation;