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// vim: set tabstop=4 shiftwidth=4 noexpandtab:
/* This file is part of the KDE project
Copyright 2011 Aurélien Gâteau <agateau@kde.org>
Copyright 2011 Paul Mendez <paulestebanms@gmail.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "KoContextBarButton.h"
// Qt
#include <QIcon>
#include <QStyleOptionToolButton>
#include <QStylePainter>
#include <QPainterPath>
#include <QApplication>
/** How lighter is the border of context bar buttons */
const int CONTEXTBAR_BORDER_LIGHTNESS = 140;
/** How darker is the background of context bar buttons */
const int CONTEXTBAR_BACKGROUND_DARKNESS = 80;
/** How lighter are context bar buttons when under mouse */
const int CONTEXTBAR_MOUSEOVER_LIGHTNESS = 120;
/** Radius of ContextBarButtons */
const int CONTEXTBAR_RADIUS = 50;
KoContextBarButton::KoContextBarButton(const QString &iconName, QWidget* parent)
: QToolButton(parent)
, m_isHovered(false)
, m_fadingValue(0)
, m_fadingTimeLine(nullptr)
{
const int size = QApplication::style()->pixelMetric(QStyle::PM_ButtonIconSize);
setIconSize(QSize(size, size));
setAutoRaise(true);
setIcon(QIcon::fromTheme(iconName));
}
void KoContextBarButton::paintEvent(QPaintEvent*)
{
QStylePainter painter(this);
painter.setRenderHint(QPainter::Antialiasing);
QStyleOptionToolButton opt;
initStyleOption(&opt);
const QColor bgColor = palette().color(QPalette::Highlight);
QColor color = bgColor.dark(CONTEXTBAR_BACKGROUND_DARKNESS);
QColor borderColor = bgColor.light(CONTEXTBAR_BORDER_LIGHTNESS);
if (opt.state & QStyle::State_MouseOver && opt.state & QStyle::State_Enabled) {
color = color.light(CONTEXTBAR_MOUSEOVER_LIGHTNESS);
borderColor = borderColor.lighter(CONTEXTBAR_MOUSEOVER_LIGHTNESS);
}
const QRectF rectF = QRectF(opt.rect).adjusted(0.5, 0.5, -0.5, -0.5);
QPainterPath path;
path.addRoundRect(rectF, CONTEXTBAR_RADIUS, CONTEXTBAR_RADIUS);
if (m_fadingValue < 255) {
color.setAlpha(m_fadingValue);
}
// Background
painter.fillPath(path, color);
if (opt.state & QStyle::State_Raised && opt.state & QStyle::State_Enabled) {
// Bottom shadow
QLinearGradient gradient(rectF.bottomLeft(), rectF.bottomLeft() - QPoint(0, 5));
gradient.setColorAt(0, QColor::fromHsvF(0, 0, 0, .3));
gradient.setColorAt(1, Qt::transparent);
painter.fillPath(path, gradient);
// Left shadow
gradient.setFinalStop(rectF.bottomLeft() + QPoint(3, 0));
painter.fillPath(path, gradient);
}
else {
// Top shadow
QLinearGradient gradient(rectF.topLeft(), rectF.topLeft() + QPoint(0, 5));
gradient.setColorAt(0, QColor::fromHsvF(0, 0, 0, .3));
gradient.setColorAt(1, Qt::transparent);
painter.fillPath(path, gradient);
// Left shadow
gradient.setFinalStop(rectF.topLeft() + QPoint(5, 0));
painter.fillPath(path, gradient);
}
// Border
painter.setPen(QPen(borderColor, 0));
painter.drawPath(path);
// Content
painter.drawControl(QStyle::CE_ToolButtonLabel, opt);
}
void KoContextBarButton::startFading()
{
Q_ASSERT(!m_fadingTimeLine);
const int duration = 300;
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 KoContextBarButton::stopFading()
{
if (m_fadingTimeLine) {
m_fadingTimeLine->stop();
delete m_fadingTimeLine;
m_fadingTimeLine = nullptr;
}
m_fadingValue = 0;
}
void KoContextBarButton::enterEvent(QEvent *event)
{
QToolButton::enterEvent(event);
// if the mouse cursor is above the selection toggle, display
// it immediately without fading timer
m_isHovered = true;
if (m_fadingTimeLine) {
m_fadingTimeLine->stop();
}
m_fadingValue = 255;
update();
}
void KoContextBarButton::leaveEvent(QEvent *event)
{
QToolButton::leaveEvent(event);
m_isHovered = false;
update();
}
void KoContextBarButton::setFadingValue(int value)
{
m_fadingValue = value;
if (m_fadingValue >= 255) {
Q_ASSERT(m_fadingTimeLine);
m_fadingTimeLine->stop();
}
update();
}
void KoContextBarButton::showEvent(QShowEvent *event)
{
stopFading();
startFading();
QToolButton::showEvent(event);
}
void KoContextBarButton::hideEvent(QHideEvent *event)
{
stopFading();
QToolButton::hideEvent(event);
}
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