///////////////////////////////////////
/* FILE fading_highlight_animation.h */

#ifndef FADING_HIGHLIGHT_ANIMATION_H
#define FADING_HIGHLIGHT_ANIMATION_H

#include <QVariantAnimation>
#include <QPalette>
#include <QColor>
#include <QAbstractButton>
#include <QLineEdit>
#include <QComboBox>
#include <QSlider>
#include <QListView>
#include <QGroupBox>

/* Class implements animated highlight effect for QWidget subclasses.
 * Effect triggered by simply call highlight() when widget updated internally by application.
 * Note: some widgets amy require tricky configuration to make it work.
 * Note: tested only on Windows 7.
 */
class FadingHighlightAnimation : public QVariantAnimation
{
    Q_OBJECT
public:
    FadingHighlightAnimation(QAbstractButton *target, QColor color, QObject *parent = 0);
    FadingHighlightAnimation(QLineEdit *target, QColor color, QObject *parent = 0);
    FadingHighlightAnimation(QComboBox *target, QColor color, QObject *parent = 0);
    FadingHighlightAnimation(QSlider *target, QColor color, QObject *parent = 0);
    FadingHighlightAnimation(QListView *target, QColor color, QObject *parent = 0);
    FadingHighlightAnimation(QGroupBox *target, QColor color, QObject *parent = 0);
    void highlight();

protected:
    virtual void updateCurrentValue(const QVariant &value);

private:
    QWidget *target;
    QColor color, default_color;
    QPalette::ColorRole target_color_role;
    enum {
        tAbstractButton,
        tLineEdit,
        tComboBox,
        tSlider,
        tListView,
        tGroupBox
    } target_type;
};

#endif // FADING_HIGHLIGHT_ANIMATION_H

///////////////////////////////////////
/* FILE fading_highlight_animation.cpp */

#include "fading_highlight_animation.h"

FadingHighlightAnimation::FadingHighlightAnimation(QAbstractButton *target, QColor color, QObject *parent) :
    QVariantAnimation(parent),
    target(target), color(color), default_color(target->palette().color(QPalette::Button)), target_type(tAbstractButton)
{
}

FadingHighlightAnimation::FadingHighlightAnimation(QLineEdit *target, QColor color, QObject *parent) :
    QVariantAnimation(parent),
    target(target), color(color), default_color(target->palette().color(QPalette::Base)), target_type(tLineEdit)
{
}

FadingHighlightAnimation::FadingHighlightAnimation(QComboBox *target, QColor color, QObject *parent) :
    QVariantAnimation(parent),
    target(target), color(color), default_color(target->palette().color(QPalette::Base)), target_type(tComboBox)
{
    target->setStyleSheet("background-color: palette(base);");
}

FadingHighlightAnimation::FadingHighlightAnimation(QSlider *target, QColor color, QObject *parent) :
    QVariantAnimation(parent),
    target(target), color(color), default_color(target->palette().color(QPalette::Window)), target_type(tSlider)
{
}

FadingHighlightAnimation::FadingHighlightAnimation(QListView *target, QColor color, QObject *parent) :
    QVariantAnimation(parent),
    target(target), color(color), default_color(target->palette().color(QPalette::Base)), target_type(tListView)
{
}

FadingHighlightAnimation::FadingHighlightAnimation(QGroupBox *target, QColor color, QObject *parent) :
    QVariantAnimation(parent),
    target(target), color(color), default_color(target->palette().color(QPalette::Window)), target_type(tGroupBox)
{
}

void FadingHighlightAnimation::highlight()
{
    stop();
    setStartValue(color);
    setEndValue(default_color);
    setDuration(800);
    start();
}

void FadingHighlightAnimation::updateCurrentValue(const QVariant &value)
{
    QColor color = value.value<QColor>();
    target->setStyleSheet(QString("background-color: rgb(%1, %2, %3);").arg(color.red()).arg(color.green()).arg(color.blue()));
}