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/*
* Qt item view mouse hover button
*
* Copyright (C) 2008 Peter Penz <peter dot penz at gmx dot at>
* Copyright (C) 2009 Marcel Wiesweg <marcel dot wiesweg at gmx dot de>
* Copyright (C) 2011 Martin Klapetek <martin dot klapetek at gmail dot com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "contact-view-hover-button.h"
// Qt includes
#include <QtGui/QPainter>
#include <QtGui/QPaintEvent>
#include <QtCore/QRect>
#include <QtCore/QTimer>
#include <QtCore/QTimeLine>
// KDE includes
#include <kglobalsettings.h>
#include <kicon.h>
#include <kiconloader.h>
#include <kiconeffect.h>
#include <klocale.h>
#include <KDebug>
ContactViewHoverButton::ContactViewHoverButton(QAbstractItemView *view)
: QAbstractButton(view->viewport()),
m_isHovered(false),
m_fadingValue(0),
m_icon(),
m_fadingTimeLine(0)
{
const bool animate = KGlobalSettings::graphicEffectsLevel() & KGlobalSettings::SimpleAnimationEffects;
const int duration = animate ? 300 : 1;
m_fadingTimeLine = new QTimeLine(duration, this);
m_fadingTimeLine->setFrameRange(0, 255);
setCheckable(true);
setChecked(false);
connect(m_fadingTimeLine, SIGNAL(frameChanged(int)),
this, SLOT(setFadingValue(int)));
connect(this, SIGNAL(toggled(bool)),
this, SLOT(refreshIcon()));
connect(KGlobalSettings::self(), SIGNAL(iconChanged(int)),
this, SLOT(refreshIcon()));
}
void ContactViewHoverButton::initIcon()
{
// virtual, cannot call from constructor
refreshIcon();
resize(sizeHint());
}
void ContactViewHoverButton::updateToolTip()
{
}
void ContactViewHoverButton::reset()
{
m_index = QModelIndex();
// hide();
}
void ContactViewHoverButton::setIndex(const QModelIndex& index)
{
m_index = index;
if (index.isValid()) {
startFading();
}
}
QModelIndex ContactViewHoverButton::index() const
{
return m_index;
}
void ContactViewHoverButton::setVisible(bool visible)
{
QAbstractButton::setVisible(visible);
stopFading();
if (visible) {
startFading();
}
}
void ContactViewHoverButton::enterEvent(QEvent* event)
{
QAbstractButton::enterEvent(event);
// if the mouse cursor is above the button, display
// it immediately without fading timer
m_isHovered = true;
m_fadingTimeLine->stop();
m_fadingValue = 255;
updateToolTip();
update();
}
void ContactViewHoverButton::leaveEvent(QEvent* event)
{
QAbstractButton::leaveEvent(event);
m_isHovered = false;
update();
}
void ContactViewHoverButton::paintEvent(QPaintEvent* event)
{
QPainter painter(this);
painter.setClipRect(event->rect());
painter.setRenderHint(QPainter::Antialiasing);
// draw an alpha blended circle as background
const QPalette& palette = parentWidget()->palette();
const QBrush& backgroundBrush = palette.brush(QPalette::Normal, QPalette::Window);
QColor background = backgroundBrush.color();
background.setAlpha(m_fadingValue / 2);
painter.setBrush(background);
const QBrush& foregroundBrush = palette.brush(QPalette::Normal, QPalette::WindowText);
QColor foreground = foregroundBrush.color();
foreground.setAlpha(m_fadingValue / 4);
painter.setPen(foreground);
painter.drawEllipse(0, 0, width(), height());
// draw the icon overlay
if (m_isHovered) {
KIconEffect iconEffect;
QPixmap activeIcon = iconEffect.apply(m_icon, KIconLoader::Desktop, KIconLoader::ActiveState);
painter.drawPixmap(0, 0, activeIcon);
} else {
if (m_fadingValue < 255) {
// apply an alpha mask respecting the fading value to the icon
QPixmap icon = m_icon;
QPixmap alphaMask(icon.width(), icon.height());
const QColor color(m_fadingValue, m_fadingValue, m_fadingValue);
alphaMask.fill(color);
icon.setAlphaChannel(alphaMask);
painter.drawPixmap(0, 0, icon);
} else {
// no fading is required
painter.drawPixmap(0, 0, m_icon);
}
}
}
void ContactViewHoverButton::setFadingValue(int value)
{
m_fadingValue = value;
if (m_fadingValue >= 255) {
m_fadingTimeLine->stop();
}
update();
}
/*
void ContactViewHoverButton::setIconOverlay()
{
const char* icon = isChecked() ? "list-remove" : "list-add";
m_icon = KIconLoader::global()->loadIcon(icon,
KIconLoader::NoGroup,
KIconLoader::SizeSmall);
}
*/
void ContactViewHoverButton::refreshIcon()
{
m_icon = icon();
update();
}
void ContactViewHoverButton::startFading()
{
if (m_fadingTimeLine->state() != QTimeLine::Running) {
m_fadingTimeLine->start();
}
m_fadingValue = 0;
}
void ContactViewHoverButton::stopFading()
{
m_fadingTimeLine->stop();
m_fadingValue = 0;
}
#include "contact-view-hover-button.moc"
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