colordialog.cpp

#include "colordialog.h"
#include <QPainter>

const int listSizeX = 13;
const int listSizeY = 15;

const QStringList colorsList = {"#fdd","#ffd","#ffd","#ffd","#dfd","#dff","#dff","#dff","#ddf","#fdf","#fdf","#fdf","#fff",
                                "#fbb","#feb","#ffb","#efb","#bfb","#bfe","#bff","#bef","#bbf","#ebf","#fbf","#fbe","#eee",
                                "#f99","#fd9","#ff9","#df9","#9f9","#9fd","#9ff","#9df","#99f","#d9f","#f9f","#f9d","#ddd",
                                "#f77","#fc7","#ff7","#cf7","#7f7","#7fc","#7ff","#7cf","#77f","#c7f","#f7f","#f7c","#ccc",
                                "#f55","#fb5","#ff5","#bf5","#5f5","#5fb","#5ff","#5bf","#55f","#b5f","#f5f","#f5b","#bbb",
                                "#f33","#fa3","#ff3","#af3","#3f3","#3fa","#3ff","#3af","#33f","#a3f","#f3f","#f3a","#aaa",
                                "#f11","#f91","#ff1","#9f1","#1f1","#1f9","#1ff","#19f","#11f","#91f","#f1f","#f19","#999",
                                "#f00","#f80","#ff0","#8f0","#0f0","#0f8","#0ff","#08f","#00f","#80f","#f0f","#f08","#888",
                                "#d00","#d70","#dd0","#7d0","#0d0","#0d7","#0dd","#07d","#00d","#70d","#d0d","#d07","#777",
                                "#b00","#b60","#bb0","#6b0","#0b0","#0b6","#0bb","#06b","#00b","#60b","#b0b","#b06","#666",
                                "#900","#950","#990","#590","#090","#095","#099","#059","#009","#509","#909","#905","#555",
                                "#700","#740","#770","#470","#070","#074","#077","#047","#007","#407","#707","#704","#444",
                                "#500","#530","#550","#350","#050","#053","#055","#035","#005","#305","#505","#503","#333",
                                "#300","#320","#330","#230","#030","#032","#033","#023","#003","#203","#303","#302","#222",
                                "#100","#110","#110","#110","#010","#011","#011","#011","#001","#101","#101","#000","#111"};

ColorDialog::ColorDialog(QWidget *parent) : QDialog(parent),
    m_hovered(-1),
    m_currentColor("#f00")
{
    resize(360,380);
    setWindowTitle("Color selection");
    setWhatsThis("Click on color to select");

    int lSize = colorsList.size();
    for(int i=0;i<lSize;++i)
    {
        RectStruct rStruct;
        rStruct.color = colorsList.at(i);
        m_rectList.append(rStruct);
    }

    setMouseTracking(true);
    setStyleSheet("background: #777;");
}

void ColorDialog::paintEvent(QPaintEvent *)
{
    QPainter p(this);

    p.setRenderHint(QPainter::Antialiasing);

    int lSize = m_rectList.size();

    if(m_hovered != -1)
    {
        p.setPen(QPen(QColor(255,255,255,255),2));
        p.setBrush(QBrush(QColor(255,255,255,255)));
        p.drawRect(m_rectList.at(m_hovered).rect.x() - 2,
                   m_rectList.at(m_hovered).rect.y() - 2,
                   m_rectList.at(m_hovered).rect.width() + 4,
                   m_rectList.at(m_hovered).rect.height() + 4);
    }

    p.setPen(QPen(QColor(0,0,0,0),1));

    for(int i=0;i<lSize;++i)
    {
        RectStruct sRect = m_rectList.at(i);
        p.setBrush(QBrush(QColor(sRect.color)));
        p.drawRect(sRect.rect);
    }

    p.end();
}

void ColorDialog::resizeEvent(QResizeEvent *)
{
    qreal rWidth = static_cast<qreal>(width()-3)/static_cast<qreal>(listSizeX);
    qreal rHeight = static_cast<qreal>(height()-3)/static_cast<qreal>(listSizeY);
    int step = 0;

    for(int i=0;i<listSizeY;++i)
    {
        for(int j=0;j<listSizeX;++j)
        {
            QRect rect(3+j*rWidth, 3+i*rHeight, rWidth-3, rHeight-3);
            m_rectList[step].rect = rect;
            ++step;
        }
    }
}

void ColorDialog::mouseMoveEvent(QMouseEvent *e)
{
    int rectNum = getHitedRect(e->pos());

    if(rectNum != -1)
    {
        if(rectNum != m_hovered)
        {
            m_hovered = rectNum;
            update();
        }
    }
}

void ColorDialog::mousePressEvent(QMouseEvent *e)
{
    if(e->button() == Qt::LeftButton)
    {
        int rectNum = getHitedRect(e->pos());

        if(rectNum != -1)
        {
            m_currentColor = m_rectList.at(rectNum).color;
            emit currentColor(m_currentColor);
            accept();
        }
    }
}

int ColorDialog::getHitedRect(const QPoint &pos)
{
    int result = -1;
    int listSize = m_rectList.size();

    for(int i=0;i<listSize;++i)
    {
        if(m_rectList.at(i).rect.contains(pos))
        {
            result = i;
            break;
        }
    }

    return result;
}