Clementine-audio-player-Mac.../src/songinfo/collapsibleinfoheader.cpp

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/* This file is part of Clementine.
Copyright 2010, David Sansome <me@davidsansome.com>
Clementine 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 3 of the License, or
(at your option) any later version.
Clementine 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 Clementine. If not, see <http://www.gnu.org/licenses/>.
*/
#include "collapsibleinfoheader.h"
#include <QApplication>
#include <QMouseEvent>
#include <QPainter>
#include <QPropertyAnimation>
#include <QStyleOption>
const int CollapsibleInfoHeader::kHeight = 20;
const int CollapsibleInfoHeader::kIconSize = 16;
CollapsibleInfoHeader::CollapsibleInfoHeader(QWidget* parent)
: QWidget(parent),
expanded_(false),
hovering_(false),
animation_(new QPropertyAnimation(this, "opacity", this)),
opacity_(0.0) {
setMinimumHeight(kHeight);
setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
setCursor(QCursor(Qt::PointingHandCursor));
}
void CollapsibleInfoHeader::SetTitle(const QString& title) {
title_ = title;
update();
}
void CollapsibleInfoHeader::SetIcon(const QIcon& icon) {
icon_ = icon;
update();
}
void CollapsibleInfoHeader::SetExpanded(bool expanded) {
expanded_ = expanded;
emit ExpandedToggled(expanded);
if (expanded)
emit Expanded();
else
emit Collapsed();
}
void CollapsibleInfoHeader::enterEvent(QEvent*) {
hovering_ = true;
if (!expanded_) {
animation_->stop();
animation_->setEndValue(1.0);
animation_->setDuration(80);
animation_->start();
}
}
void CollapsibleInfoHeader::leaveEvent(QEvent*) {
hovering_ = false;
if (!expanded_) {
animation_->stop();
animation_->setEndValue(0.0);
animation_->setDuration(160);
animation_->start();
}
}
void CollapsibleInfoHeader::set_opacity(float opacity) {
opacity_ = opacity;
update();
}
void CollapsibleInfoHeader::paintEvent(QPaintEvent* e) {
QPainter p(this);
QColor active_text_color(
palette().color(QPalette::Active, QPalette::HighlightedText));
QColor inactive_text_color(palette().color(QPalette::Active, QPalette::Text));
QColor text_color;
if (expanded_) {
text_color = active_text_color;
} else {
p.setOpacity(0.4 + opacity_ * 0.6);
text_color = QColor(active_text_color.red() * opacity_ +
inactive_text_color.red() * (1.0 - opacity_),
active_text_color.green() * opacity_ +
inactive_text_color.green() * (1.0 - opacity_),
active_text_color.blue() * opacity_ +
inactive_text_color.blue() * (1.0 - opacity_));
}
QRect indicator_rect(0, 0, height(), height());
QRect icon_rect(height() + 2, (kHeight - kIconSize) / 2, kIconSize,
kIconSize);
QRect text_rect(rect());
text_rect.setLeft(icon_rect.right() + 4);
// Draw the background
QColor highlight(palette().color(QPalette::Active, QPalette::Highlight));
const QColor bg_color_1(highlight.lighter(120));
const QColor bg_color_2(highlight.darker(120));
const QColor bg_border(palette().color(QPalette::Dark));
QLinearGradient bg_brush(rect().topLeft(), rect().bottomLeft());
bg_brush.setColorAt(0.0, bg_color_1);
bg_brush.setColorAt(0.5, bg_color_1);
bg_brush.setColorAt(0.5, bg_color_2);
bg_brush.setColorAt(1.0, bg_color_2);
p.setPen(Qt::NoPen);
p.fillRect(rect(), bg_brush);
p.setPen(bg_border);
p.drawLine(rect().topLeft(), rect().topRight());
p.drawLine(rect().bottomLeft(), rect().bottomRight());
// Draw the expand/collapse indicator
QStyleOption opt;
opt.initFrom(this);
opt.rect = indicator_rect;
opt.state |= QStyle::State_Children;
if (expanded_) opt.state |= QStyle::State_Open;
if (hovering_) opt.state |= QStyle::State_Active;
// Have to use the application's style here because using the widget's style
// will trigger QStyleSheetStyle's recursion guard (I don't know why).
QApplication::style()->drawPrimitive(QStyle::PE_IndicatorBranch, &opt, &p,
this);
// Draw the icon
p.drawPixmap(icon_rect, icon_.pixmap(kIconSize));
// Draw the title text
QFont bold_font(font());
bold_font.setBold(true);
p.setFont(bold_font);
p.setPen(text_color);
p.drawText(text_rect, Qt::AlignLeft | Qt::AlignVCenter, title_);
}
void CollapsibleInfoHeader::mouseReleaseEvent(QMouseEvent* e) {
SetExpanded(!expanded_);
}