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/***************************************************************************
* Copyright (C) 2008 by Peter Penz <[email protected]> *
* *
* 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 "selectiontoggle.h"
#include <kglobalsettings.h>
#include <kicon.h>
#include <kiconloader.h>
#include <kiconeffect.h>
#include <klocale.h>
#include <QPainter>
#include <QPaintEvent>
#include <QRect>
#include <QTimer>
#include <QTimeLine>
SelectionToggle::SelectionToggle(QWidget* parent) :
QAbstractButton(parent),
m_isHovered(false),
m_fadingValue(0),
m_icon(),
m_fadingTimeLine(0)
{
setFocusPolicy(Qt::NoFocus);
parent->installEventFilter(this);
resize(sizeHint());
setIconOverlay(isChecked());
connect(this, SIGNAL(toggled(bool)),
this, SLOT(setIconOverlay(bool)));
connect(KGlobalSettings::self(), SIGNAL(iconChanged(int)),
this, SLOT(refreshIcon()));
}
SelectionToggle::~SelectionToggle()
{
}
QSize SelectionToggle::sizeHint() const
{
return QSize(16, 16);
}
void SelectionToggle::reset()
{
m_url = KUrl();
hide();
}
void SelectionToggle::setUrl(const KUrl& url)
{
m_url = url;
if (!url.isEmpty()) {
startFading();
}
}
KUrl SelectionToggle::url() const
{
return m_url;
}
void SelectionToggle::setVisible(bool visible)
{
QAbstractButton::setVisible(visible);
stopFading();
if (visible) {
startFading();
}
}
bool SelectionToggle::eventFilter(QObject* obj, QEvent* event)
{
if ((obj == parent()) && (event->type() == QEvent::Leave)) {
hide();
}
return QAbstractButton::eventFilter(obj, event);
}
void SelectionToggle::enterEvent(QEvent* event)
{
QAbstractButton::enterEvent(event);
// if the mouse cursor is above the selection toggle, display
// it immediately without fading timer
m_isHovered = true;
if (m_fadingTimeLine != 0) {
m_fadingTimeLine->stop();
}
m_fadingValue = 255;
setToolTip(isChecked() ? i18nc("@info:tooltip", "Deselect Item") :
i18nc("@info:tooltip", "Select Item"));
update();
}
void SelectionToggle::leaveEvent(QEvent* event)
{
QAbstractButton::leaveEvent(event);
m_isHovered = false;
update();
}
void SelectionToggle::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 SelectionToggle::setFadingValue(int value)
{
m_fadingValue = value;
if (m_fadingValue >= 255) {
Q_ASSERT(m_fadingTimeLine != 0);
m_fadingTimeLine->stop();
}
update();
}
void SelectionToggle::setIconOverlay(bool checked)
{
const char* icon = checked ? "list-remove" : "list-add";
m_icon = KIconLoader::global()->loadIcon(icon,
KIconLoader::NoGroup,
KIconLoader::SizeSmall);
update();
}
void SelectionToggle::refreshIcon()
{
setIconOverlay(isChecked());
}
void SelectionToggle::startFading()
{
Q_ASSERT(m_fadingTimeLine == 0);
const bool animate = KGlobalSettings::graphicEffectsLevel() & KGlobalSettings::SimpleAnimationEffects;
const int duration = animate ? 600 : 1;
m_fadingTimeLine = new QTimeLine(duration, this);
connect(m_fadingTimeLine, SIGNAL(frameChanged(int)),
this, SLOT(setFadingValue(int)));
m_fadingTimeLine->setFrameRange(0, 255);
m_fadingTimeLine->start();
m_fadingValue = 0;
}
void SelectionToggle::stopFading()
{
if (m_fadingTimeLine != 0) {
m_fadingTimeLine->stop();
delete m_fadingTimeLine;
m_fadingTimeLine = 0;
}
m_fadingValue = 0;
}
#include "selectiontoggle.moc"
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