plasma-framework/widgets/pushbutton.cpp

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/*
* Copyright 2008 Aaron Seigo <aseigo@kde.org>
* Copyright 2008 Marco Martin <notmart@gmail.com>
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "pushbutton.h"
#include <QStyleOptionGraphicsItem>
#include <QPainter>
#include <QDir>
#include <QApplication>
#include <KIcon>
#include <KIconEffect>
#include <KMimeType>
#include <KPushButton>
#include "theme.h"
#include "svg.h"
#include "panelsvg.h"
#include "animator.h"
#include "paintutils.h"
namespace Plasma
{
class PushButtonPrivate
{
public:
PushButtonPrivate(PushButton *pushButton)
: q(pushButton),
background(0),
animId(-1),
fadeIn(false),
svg(0)
{
}
~PushButtonPrivate()
{
delete svg;
}
void setPixmap(PushButton *q)
{
if (imagePath.isEmpty()) {
return;
}
KMimeType::Ptr mime = KMimeType::findByPath(absImagePath);
QPixmap pm(q->size().toSize());
if (mime->is("image/svg+xml")) {
svg = new Svg();
QPainter p(&pm);
svg->paint(&p, pm.rect());
} else {
pm = QPixmap(absImagePath);
}
static_cast<KPushButton*>(q->widget())->setIcon(KIcon(pm));
}
void syncActiveRect();
void syncBorders();
void animationUpdate(qreal progress);
PushButton *q;
PanelSvg *background;
int animId;
bool fadeIn;
qreal opacity;
QRectF activeRect;
QString imagePath;
QString absImagePath;
Svg *svg;
};
void PushButtonPrivate::syncActiveRect()
{
background->setElementPrefix("normal");
qreal left, top, right, bottom;
background->getMargins(left, top, right, bottom);
background->setElementPrefix("active");
qreal activeLeft, activeTop, activeRight, activeBottom;
background->getMargins(activeLeft, activeTop, activeRight, activeBottom);
activeRect = QRectF(QPointF(0,0), q->size());
activeRect.adjust(left - activeLeft, top - activeTop, -(right - activeRight), -(bottom - activeBottom));
background->setElementPrefix("normal");
}
void PushButtonPrivate::syncBorders()
{
//set margins from the normal element
qreal left, top, right, bottom;
background->setElementPrefix("normal");
background->getMargins(left, top, right, bottom);
q->setContentsMargins(left, top, right, bottom);
//calc the rect for the over effect
syncActiveRect();
}
void PushButtonPrivate::animationUpdate(qreal progress)
{
if (progress == 1) {
animId = -1;
fadeIn = true;
}
opacity = fadeIn ? progress : 1 - progress;
// explicit update
q->update();
}
PushButton::PushButton(QGraphicsWidget *parent)
: QGraphicsProxyWidget(parent),
d(new PushButtonPrivate(this))
{
KPushButton* native = new KPushButton;
connect(native, SIGNAL(clicked()), this, SIGNAL(clicked()));
setWidget(native);
native->setAttribute(Qt::WA_NoSystemBackground);
d->background = new PanelSvg(this);
d->background->setImagePath("widgets/button");
d->background->setCacheAllRenderedPanels(true);
d->background->setElementPrefix("normal");
d->syncBorders();
setAcceptHoverEvents(true);
connect(Plasma::Theme::defaultTheme(), SIGNAL(themeChanged()), SLOT(syncBorders()));
}
PushButton::~PushButton()
{
delete d;
}
void PushButton::setText(const QString &text)
{
static_cast<KPushButton*>(widget())->setText(text);
}
QString PushButton::text() const
{
return static_cast<KPushButton*>(widget())->text();
}
void PushButton::setImage(const QString &path)
{
if (d->imagePath == path) {
return;
}
delete d->svg;
d->svg = 0;
d->imagePath = path;
bool absolutePath = !path.isEmpty() &&
#ifdef Q_WS_WIN
!QDir::isRelativePath(path)
#else
(path[0] == '/' || path.startsWith(":/"))
#endif
;
if (absolutePath) {
d->absImagePath = path;
} else {
//TODO: package support
d->absImagePath = Theme::defaultTheme()->imagePath(path);
}
d->setPixmap(this);
}
QString PushButton::image() const
{
return d->imagePath;
}
void PushButton::setStyleSheet(const QString &stylesheet)
{
widget()->setStyleSheet(stylesheet);
}
QString PushButton::styleSheet()
{
return widget()->styleSheet();
}
KPushButton* PushButton::nativeWidget() const
{
return static_cast<KPushButton*>(widget());
}
void PushButton::resizeEvent(QGraphicsSceneResizeEvent *event)
{
d->setPixmap(this);
if (d->background) {
//resize all four panels
d->background->setElementPrefix("pressed");
d->background->resizePanel(size());
d->background->setElementPrefix("focus");
d->background->resizePanel(size());
d->syncActiveRect();
d->background->setElementPrefix("active");
d->background->resizePanel(d->activeRect.size());
d->background->setElementPrefix("normal");
d->background->resizePanel(size());
}
QGraphicsProxyWidget::resizeEvent(event);
}
void PushButton::paint(QPainter *painter,
const QStyleOptionGraphicsItem *option,
QWidget *widget)
{
if (!styleSheet().isNull()) {
QGraphicsProxyWidget::paint(painter, option, widget);
return;
}
QPixmap bufferPixmap;
//Normal button, pressed or not
if (isEnabled()) {
if (nativeWidget()->isDown()) {
d->background->setElementPrefix("pressed");
} else {
d->background->setElementPrefix("normal");
}
if (d->animId == -1) {
d->background->paintPanel(painter);
}
//flat or disabled
} else if (!isEnabled() || nativeWidget()->isFlat()) {
bufferPixmap = QPixmap(rect().size().toSize());
bufferPixmap.fill(Qt::transparent);
QPainter buffPainter(&bufferPixmap);
d->background->paintPanel(&buffPainter);
buffPainter.setCompositionMode(QPainter::CompositionMode_DestinationIn);
buffPainter.fillRect(bufferPixmap.rect(), QColor(0,0,0,128));
painter->drawPixmap( 0, 0, bufferPixmap);
}
//if is under mouse draw the animated glow overlay
if (!nativeWidget()->isDown() && isEnabled() && acceptHoverEvents()) {
if (d->animId != -1) {
QPixmap normalPix = d->background->panelPixmap();
d->background->setElementPrefix("active");
painter->drawPixmap(d->activeRect.topLeft(), PaintUtils::transition(d->background->panelPixmap(), normalPix, 1 - d->opacity));
} else if (isUnderMouse() || nativeWidget()->isDefault()) {
d->background->setElementPrefix("active");
d->background->paintPanel(painter, d->activeRect.topLeft());
}
}
if (nativeWidget()->hasFocus()) {
d->background->setElementPrefix("focus");
d->background->paintPanel(painter);
}
painter->setPen(Plasma::Theme::defaultTheme()->color(Theme::ButtonTextColor));
if (nativeWidget()->isDown()) {
painter->translate(QPoint(1, 1));
}
QRectF rect = contentsRect();
if (!nativeWidget()->icon().isNull()) {
QPixmap iconPix = nativeWidget()->icon().pixmap(rect.height(), rect.height());
if (!isEnabled()) {
KIconEffect *effect = KIconLoader::global()->iconEffect();
iconPix = effect->apply(iconPix, KIconLoader::Toolbar, KIconLoader::DisabledState);
}
if (option->direction == Qt::LeftToRight) {
painter->drawPixmap(rect.topLeft(), iconPix);
rect.adjust(rect.height(), 0, 0, 0);
} else {
painter->drawPixmap(rect.topRight() - QPoint(rect.height(), 0), iconPix);
rect.adjust(0, 0, -rect.height(), 0);
}
}
//if there is not enough room for the text make it to fade out
QFontMetricsF fm(QApplication::font());
if (rect.width() < fm.width(nativeWidget()->text())) {
if (bufferPixmap.isNull()) {
bufferPixmap = QPixmap(rect.size().toSize());
}
bufferPixmap.fill(Qt::transparent);
QPainter p(&bufferPixmap);
p.setPen(painter->pen());
// Create the alpha gradient for the fade out effect
QLinearGradient alphaGradient(0, 0, 1, 0);
alphaGradient.setCoordinateMode(QGradient::ObjectBoundingMode);
if (option->direction == Qt::LeftToRight) {
alphaGradient.setColorAt(0, QColor(0, 0, 0, 255));
alphaGradient.setColorAt(1, QColor(0, 0, 0, 0));
p.drawText(bufferPixmap.rect(), Qt::AlignLeft|Qt::AlignVCenter, nativeWidget()->text() );
} else {
alphaGradient.setColorAt(0, QColor(0, 0, 0, 0));
alphaGradient.setColorAt(1, QColor(0, 0, 0, 255));
p.drawText(bufferPixmap.rect(), Qt::AlignRight|Qt::AlignVCenter, nativeWidget()->text() );
}
p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
p.fillRect(bufferPixmap.rect(), alphaGradient);
painter->drawPixmap(rect.topLeft(), bufferPixmap);
} else {
painter->drawText(rect, Qt::AlignCenter, nativeWidget()->text() );
}
}
void PushButton::hoverEnterEvent(QGraphicsSceneHoverEvent *event)
{
const int FadeInDuration = 75;
if (d->animId != -1) {
Plasma::Animator::self()->stopCustomAnimation(d->animId);
}
d->animId = Plasma::Animator::self()->customAnimation(40 / (1000 / FadeInDuration), FadeInDuration,Plasma::Animator::LinearCurve, this, "animationUpdate");
d->background->setElementPrefix("active");
QGraphicsProxyWidget::hoverEnterEvent(event);
}
void PushButton::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
{
const int FadeOutDuration = 150;
if (d->animId != -1) {
Plasma::Animator::self()->stopCustomAnimation(d->animId != -1);
}
d->fadeIn = false;
d->animId = Plasma::Animator::self()->customAnimation(40 / (1000 / FadeOutDuration), FadeOutDuration,Plasma::Animator::LinearCurve, this, "animationUpdate");
d->background->setElementPrefix("active");
QGraphicsProxyWidget::hoverLeaveEvent(event);
}
} // namespace Plasma
#include <pushbutton.moc>