plasma-framework/widgets/label.cpp

355 lines
8.9 KiB
C++

/*
* Copyright 2008 Aaron Seigo <aseigo@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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "label.h"
#include <QApplication>
#include <QDir>
#include <QGraphicsSceneMouseEvent>
#include <QLabel>
#include <QMenu>
#include <QPainter>
#include <QStyleOptionGraphicsItem>
#include <kcolorscheme.h>
#include <kglobalsettings.h>
#include <qmimedatabase.h>
#include "private/themedwidgetinterface_p.h"
#include "svg.h"
#include "theme.h"
namespace Plasma
{
class LabelPrivate : public ThemedWidgetInterface<Label>
{
public:
LabelPrivate(Label *label)
: ThemedWidgetInterface<Label>(label),
svg(0),
textSelectable(false),
hasLinks(false)
{
}
~LabelPrivate()
{
delete svg;
}
void setPixmap()
{
if (imagePath.isEmpty()) {
delete svg;
svg = 0;
return;
}
QMimeDatabase db;
QMimeType mime = db.mimeTypeForFile(absImagePath);
QPixmap pm(q->size().toSize());
if (mime.inherits("image/svg+xml") || mime.inherits("image/svg+xml-compressed")) {
if (!svg || svg->imagePath() != absImagePath) {
delete svg;
svg = new Svg();
svg->setImagePath(imagePath);
QObject::connect(svg, SIGNAL(repaintNeeded()), q, SLOT(setPixmap()));
}
QPainter p(&pm);
svg->paint(&p, pm.rect());
} else {
delete svg;
svg = 0;
pm = QPixmap(absImagePath);
}
static_cast<QLabel*>(q->widget())->setPixmap(pm);
}
QString imagePath;
QString absImagePath;
Svg *svg;
bool textSelectable : 1;
bool hasLinks : 1;
};
Label::Label(QGraphicsWidget *parent)
: QGraphicsProxyWidget(parent),
d(new LabelPrivate(this))
{
QLabel *native = new QLabel;
native->setWindowFlags(native->windowFlags()|Qt::BypassGraphicsProxyWidget);
native->setAttribute(Qt::WA_NoSystemBackground);
native->setWordWrap(true);
native->setWindowIcon(QIcon());
connect(native, SIGNAL(linkActivated(QString)), this, SIGNAL(linkActivated(QString)));
connect(native, SIGNAL(linkHovered(QString)), this, SIGNAL(linkHovered(QString)));
d->setWidget(native);
d->initTheming();
}
Label::~Label()
{
delete d;
}
void Label::setText(const QString &text)
{
d->hasLinks = text.contains("<a ", Qt::CaseInsensitive);
static_cast<QLabel*>(widget())->setText(text);
updateGeometry();
}
QString Label::text() const
{
return static_cast<QLabel*>(widget())->text();
}
void Label::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(QLatin1String(":/")))
#endif
;
if (absolutePath) {
d->absImagePath = path;
} else {
//TODO: package support
d->absImagePath = Theme::defaultTheme()->imagePath(path);
}
d->setPixmap();
}
QString Label::image() const
{
return d->imagePath;
}
void Label::setScaledContents(bool scaled)
{
static_cast<QLabel*>(widget())->setScaledContents(scaled);
}
bool Label::hasScaledContents() const
{
return static_cast<QLabel*>(widget())->hasScaledContents();
}
void Label::setTextSelectable(bool enable)
{
if (enable) {
nativeWidget()->setTextInteractionFlags(Qt::TextBrowserInteraction);
} else {
nativeWidget()->setTextInteractionFlags(Qt::LinksAccessibleByMouse | Qt::LinksAccessibleByKeyboard);
}
d->textSelectable = enable;
}
bool Label::textSelectable() const
{
return d->textSelectable;
}
void Label::setAlignment(Qt::Alignment alignment)
{
nativeWidget()->setAlignment(alignment);
}
Qt::Alignment Label::alignment() const
{
return nativeWidget()->alignment();
}
void Label::setWordWrap(bool wrap)
{
nativeWidget()->setWordWrap(wrap);
}
bool Label::wordWrap() const
{
return nativeWidget()->wordWrap();
}
void Label::setStyleSheet(const QString &stylesheet)
{
widget()->setStyleSheet(stylesheet);
}
QString Label::styleSheet()
{
return widget()->styleSheet();
}
QLabel *Label::nativeWidget() const
{
return static_cast<QLabel*>(widget());
}
void Label::dataUpdated(const QString &sourceName, const Plasma::DataEngine::Data &data)
{
Q_UNUSED(sourceName);
QStringList texts;
foreach (const QVariant &v, data) {
if (v.canConvert(QVariant::String)) {
texts << v.toString();
}
}
setText(texts.join(" "));
}
void Label::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
{
if (d->textSelectable || d->hasLinks){
QContextMenuEvent contextMenuEvent(QContextMenuEvent::Reason(event->reason()),
event->pos().toPoint(), event->screenPos(), event->modifiers());
QApplication::sendEvent(nativeWidget(), &contextMenuEvent);
}else{
event->ignore();
}
}
void Label::resizeEvent(QGraphicsSceneResizeEvent *event)
{
d->setPixmap();
QGraphicsProxyWidget::resizeEvent(event);
}
void Label::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
QGraphicsProxyWidget::mousePressEvent(event);
//FIXME: when QTextControl accept()s mouse press events (as of Qt 4.6.2, it processes them
//but never marks them as accepted) the following event->accept() can be removed
if (d->textSelectable || d->hasLinks) {
event->accept();
}
}
void Label::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
if (d->textSelectable) {
QGraphicsProxyWidget::mouseMoveEvent(event);
}
}
void Label::paint(QPainter *painter,
const QStyleOptionGraphicsItem *option,
QWidget *widget)
{
QLabel *native = nativeWidget();
QFontMetrics fm(native->font());
//indirect painting still used for fade out
if (native->wordWrap() || native->text().isEmpty() || size().width() >= fm.width(native->text())) {
QGraphicsProxyWidget::paint(painter, option, widget);
} else {
const int gradientLength = 25;
QPixmap buffer(contentsRect().size().toSize());
buffer.fill(Qt::transparent);
QPainter buffPainter(&buffer);
QGraphicsProxyWidget::paint(&buffPainter, option, widget);
QLinearGradient gr;
buffPainter.setCompositionMode(QPainter::CompositionMode_DestinationIn);
buffPainter.setPen(Qt::NoPen);
if (option->direction == Qt::LeftToRight) {
gr.setStart(size().width()-gradientLength, 0);
gr.setFinalStop(size().width(), 0);
gr.setColorAt(0, Qt::black);
gr.setColorAt(1, Qt::transparent);
buffPainter.setBrush(gr);
buffPainter.drawRect(QRect(gr.start().toPoint(), QSize(gradientLength, size().height())));
} else {
gr.setStart(0, 0);
gr.setFinalStop(gradientLength, 0);
gr.setColorAt(0, Qt::transparent);
gr.setColorAt(1, Qt::black);
buffPainter.setBrush(gr);
buffPainter.drawRect(QRect(0, 0, gradientLength, size().height()));
}
buffPainter.end();
painter->drawPixmap(contentsRect(), buffer, buffer.rect());
}
}
void Label::changeEvent(QEvent *event)
{
d->changeEvent(event);
QGraphicsProxyWidget::changeEvent(event);
}
bool Label::event(QEvent *event)
{
d->event(event);
return QGraphicsProxyWidget::event(event);
}
QVariant Label::itemChange(GraphicsItemChange change, const QVariant & value)
{
if (change == QGraphicsItem::ItemCursorHasChanged) {
nativeWidget()->setCursor(cursor());
}
return QGraphicsWidget::itemChange(change, value);
}
QSizeF Label::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
{
if (sizePolicy().verticalPolicy() == QSizePolicy::Fixed) {
return QGraphicsProxyWidget::sizeHint(Qt::PreferredSize, constraint);
} else {
return QGraphicsProxyWidget::sizeHint(which, constraint);
}
}
} // namespace Plasma
#include "moc_label.cpp"