plasma-framework/widgets/flashinglabel.cpp

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/*
* Copyright 2007 by André Duffeck <duffeck@kde.org>
*
* This program 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, 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 Library General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Stre
* et, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "flashinglabel.h"
#include <QtCore/QString>
#include <QtCore/QTimeLine>
#include <QtCore/QTimer>
#include <QtCore/QWeakPointer>
#include <QtGui/QPainter>
#include <QtGui/QPixmap>
#include <QtGui/QColor>
#include <kdebug.h>
#include <plasma/animator.h>
#include <plasma/animations/animation.h>
#include <plasma/theme.h>
using namespace Plasma;
class Plasma::FlashingLabelPrivate
{
public:
enum FlashingLabelType {
Text,
Pixmap
};
enum State {
Visible,
Invisible
};
FlashingLabelPrivate(FlashingLabel *flash)
: q(flash),
defaultDuration(3000),
type(FlashingLabelPrivate::Text),
color(Plasma::Theme::defaultTheme()->color(Plasma::Theme::TextColor)),
state(FlashingLabelPrivate::Invisible),
autohide(false)
{
fadeOutTimer.setInterval(defaultDuration);
fadeOutTimer.setSingleShot(true);
fadeInTimer.setInterval(0);
fadeInTimer.setSingleShot(true);
QObject::connect(Theme::defaultTheme(), SIGNAL(themeChanged()), q, SLOT(setPalette()));
}
~FlashingLabelPrivate() { }
void renderPixmap(const QSize &size);
void setupFlash(int duration);
void elementAnimationFinished();
void setPalette();
FlashingLabel *q;
int defaultDuration;
FlashingLabelType type;
QTimer fadeInTimer;
QTimer fadeOutTimer;
QString text;
QColor color;
QFont font;
QPixmap pixmap;
QWeakPointer<Plasma::Animation> anim;
QPixmap renderedPixmap;
QTextOption textOption;
Qt::Alignment alignment;
State state;
bool autohide;
};
FlashingLabel::FlashingLabel(QGraphicsItem *parent)
: QGraphicsWidget(parent),
d(new FlashingLabelPrivate(this))
{
setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Minimum);
setCacheMode(NoCache);
connect(&d->fadeOutTimer, SIGNAL(timeout()), this, SLOT(fadeOut()));
connect(&d->fadeInTimer, SIGNAL(timeout()), this, SLOT(fadeIn()));
}
FlashingLabel::~FlashingLabel()
{
delete d;
}
int FlashingLabel::duration() const
{
return d->defaultDuration;
}
void FlashingLabel::setDuration(int duration)
{
if (duration < 1) {
return;
}
d->defaultDuration = duration;
}
QColor FlashingLabel::color() const
{
return d->color;
}
void FlashingLabel::setColor(const QColor &color)
{
d->color = color;
}
QFont FlashingLabel::font() const
{
return d->font;
}
void FlashingLabel::setFont(const QFont &font)
{
d->font = font;
}
void FlashingLabel::flash(const QString &text, int duration, const QTextOption &option)
{
if (text.isEmpty()) {
return;
}
//kDebug() << duration << text;
d->type = FlashingLabelPrivate::Text;
d->text = text;
d->textOption = option;
d->setupFlash(duration);
}
void FlashingLabel::flash(const QPixmap &pixmap, int duration, Qt::Alignment align)
{
if (pixmap.isNull()) {
return;
}
d->type = FlashingLabelPrivate::Pixmap;
d->pixmap = pixmap;
d->alignment = align;
d->setupFlash(duration);
}
void FlashingLabel::setAutohide(bool autohide)
{
d->autohide = autohide;
if (autohide) {
if (d->anim.data()) {
connect(d->anim.data(), SIGNAL(finished()), this, SLOT(elementAnimationFinished()));
}
} else if (d->anim.data()) {
disconnect(d->anim.data(), SIGNAL(finished()), this, SLOT(elementAnimationFinished()));
}
}
bool FlashingLabel::autohide() const
{
return d->autohide;
}
void FlashingLabel::kill()
{
d->fadeInTimer.stop();
if (d->state == FlashingLabelPrivate::Visible) {
fadeOut();
}
}
void FlashingLabel::fadeIn()
{
//kDebug();
if (d->autohide) {
show();
}
d->state = FlashingLabelPrivate::Visible;
if (!d->anim.data()) {
d->anim = Plasma::Animator::create(Plasma::Animator::PixmapTransitionAnimation);
Plasma::Animation *animation = d->anim.data();
animation->setProperty("startPixmap", d->renderedPixmap);
animation->setTargetWidget(this);
animation->start();
} else {
Plasma::Animation *animation = d->anim.data();
if (animation->state() == QAbstractAnimation::Running) {
animation->stop();
animation->start();
}
}
}
void FlashingLabel::fadeOut()
{
if (d->state == FlashingLabelPrivate::Invisible) {
return; // FlashingLabel was already killed - do not animate again
}
d->state = FlashingLabelPrivate::Invisible;
if (d->anim.data()) {
Plasma::Animation *animation = d->anim.data();
animation->setProperty("direction", QAbstractAnimation::Backward);
animation->start(QAbstractAnimation::DeleteWhenStopped);
} else {
d->anim = Plasma::Animator::create(Plasma::Animator::PixmapTransitionAnimation);
Plasma::Animation *animation = d->anim.data();
animation->setProperty("direction", QAbstractAnimation::Backward);
animation->setProperty("startPixmap", d->renderedPixmap);
animation->setTargetWidget(this);
animation->start(QAbstractAnimation::DeleteWhenStopped);
}
}
void FlashingLabel::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
Q_UNUSED(option)
Q_UNUSED(widget)
if (d->anim.data()) {
Plasma::Animation *animation = d->anim.data();
painter->drawPixmap(0, 0, qvariant_cast<QPixmap>(animation->property("currentPixmap")));
} else {
if (d->state == FlashingLabelPrivate::Visible) {
painter->drawPixmap(0, 0, d->renderedPixmap);
}
}
}
QSizeF FlashingLabel::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
{
if (which == Qt::PreferredSize) {
QFontMetrics fm(d->font);
return fm.boundingRect(d->text).size();
}
return QGraphicsWidget::sizeHint(which, constraint);
}
void FlashingLabelPrivate::renderPixmap(const QSize &size)
{
if (renderedPixmap.size() != size) {
renderedPixmap = QPixmap(size);
}
renderedPixmap.fill(Qt::transparent);
QPainter painter(&renderedPixmap);
if (type == FlashingLabelPrivate::Text) {
painter.setPen(color);
painter.setFont(font);
painter.drawText(QRect(QPoint(0, 0), size), text, textOption);
} else if (type == FlashingLabelPrivate::Pixmap) {
QPoint p;
if(alignment & Qt::AlignLeft) {
p.setX(0);
} else if (alignment & Qt::AlignRight) {
p.setX(size.width() - pixmap.width());
} else {
p.setX((size.width() - pixmap.width()) / 2);
}
if (alignment & Qt::AlignTop) {
p.setY(0);
} else if (alignment & Qt::AlignRight) {
p.setY(size.height() - pixmap.height());
} else {
p.setY((size.height() - pixmap.height()) / 2);
}
painter.drawPixmap(p, pixmap);
}
painter.end();
if (anim.data()) {
Plasma::Animation *animation = anim.data();
animation->setProperty("startPixmap", renderedPixmap);
}
}
void FlashingLabelPrivate::setupFlash(int duration)
{
fadeOutTimer.stop();
fadeOutTimer.setInterval(duration > 0 ? duration : defaultDuration);
renderPixmap(q->size().toSize());
if (state != FlashingLabelPrivate::Visible) {
fadeInTimer.start();
} else {
q->update();
}
if (fadeOutTimer.interval() > 0) {
fadeOutTimer.start();
}
}
void FlashingLabelPrivate::elementAnimationFinished()
{
if (autohide && state == FlashingLabelPrivate::Invisible && anim.data()) {
q->hide();
}
}
void FlashingLabelPrivate::setPalette()
{
color = Plasma::Theme::defaultTheme()->color(Plasma::Theme::TextColor);
q->update();
}
#include "flashinglabel.moc"