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- /*******************************************************************************
- * Copyright (C) 2008 by Konstantin Heil <konst.heil@stud.uni-heidelberg.de> *
- * *
- * This program 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 2 of the License, 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 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 "tooltipmanager.h"
- #include "filemetadatatooltip.h"
- #include <KIcon>
- #include <KIO/JobUiDelegate>
- #include <KIO/PreviewJob>
- #include <QApplication>
- #include <QDesktopWidget>
- #include <QLayout>
- #include <QScrollArea>
- #include <QScrollBar>
- #include <QStyle>
- #include <QTimer>
- #include <QProcess>
- ToolTipManager::ToolTipManager(QWidget* parent) :
- QObject(parent),
- m_showToolTipTimer(0),
- m_contentRetrievalTimer(0),
- m_fileMetaDataToolTip(0),
- m_toolTipRequested(false),
- m_metaDataRequested(false),
- m_appliedWaitCursor(false),
- m_margin(4),
- m_item(),
- m_itemRect()
- {
- if (parent) {
- m_margin = qMax(m_margin, parent->style()->pixelMetric(QStyle::PM_ToolTipLabelFrameWidth));
- }
- m_showToolTipTimer = new QTimer(this);
- m_showToolTipTimer->setSingleShot(true);
- m_showToolTipTimer->setInterval(500);
- connect(m_showToolTipTimer, SIGNAL(timeout()), this, SLOT(showToolTip()));
- m_contentRetrievalTimer = new QTimer(this);
- m_contentRetrievalTimer->setSingleShot(true);
- m_contentRetrievalTimer->setInterval(200);
- connect(m_contentRetrievalTimer, SIGNAL(timeout()), this, SLOT(startContentRetrieval()));
- Q_ASSERT(m_contentRetrievalTimer->interval() < m_showToolTipTimer->interval());
- }
- ToolTipManager::~ToolTipManager()
- {
- delete m_fileMetaDataToolTip;
- m_fileMetaDataToolTip = 0;
- }
- void ToolTipManager::showToolTip(const KFileItem& item, const QRectF& itemRect)
- {
- hideToolTip();
- m_itemRect = itemRect.toRect();
- m_itemRect.adjust(-m_margin, -m_margin, m_margin, m_margin);
- m_item = item;
- // Only start the retrieving of the content, when the mouse has been over this
- // item for 200 milliseconds. This prevents a lot of useless preview jobs and
- // meta data retrieval, when passing rapidly over a lot of items.
- Q_ASSERT(!m_fileMetaDataToolTip);
- m_fileMetaDataToolTip = new FileMetaDataToolTip();
- connect(m_fileMetaDataToolTip, SIGNAL(metaDataRequestFinished(KFileItemList)),
- this, SLOT(slotMetaDataRequestFinished()));
- m_contentRetrievalTimer->start();
- m_showToolTipTimer->start();
- m_toolTipRequested = true;
- Q_ASSERT(!m_metaDataRequested);
- }
- void ToolTipManager::hideToolTip()
- {
- if (m_appliedWaitCursor) {
- QApplication::restoreOverrideCursor();
- m_appliedWaitCursor = false;
- }
- m_toolTipRequested = false;
- m_metaDataRequested = false;
- m_showToolTipTimer->stop();
- m_contentRetrievalTimer->stop();
- if (m_fileMetaDataToolTip) {
- m_fileMetaDataToolTip->hide();
- // Do not delete the tool tip immediately to prevent crashes when
- // QCoreApplication tries to deliver an 'Enter' event to it, see bug 310579.
- m_fileMetaDataToolTip->deleteLater();
- m_fileMetaDataToolTip = 0;
- // Kill mouse over action
- QObject *parent;
- QString program = "/usr/bin/pkill";
- QStringList arguments;
- arguments << "-f" << "/usr/local/bin/MouseOverAction.sh";
- QProcess *killAction = new QProcess(parent);
- killAction->start(program, arguments);
- }
- }
- void ToolTipManager::startContentRetrieval()
- {
- if (!m_toolTipRequested) {
- return;
- }
- m_fileMetaDataToolTip->setName(m_item.text());
- // Request the retrieval of meta-data. The slot
- // slotMetaDataRequestFinished() is invoked after the
- // meta-data have been received.
- m_metaDataRequested = true;
- m_fileMetaDataToolTip->setItems(KFileItemList() << m_item);
- m_fileMetaDataToolTip->adjustSize();
- // Request a preview of the item
- m_fileMetaDataToolTip->setPreview(QPixmap());
- KIO::PreviewJob* job = new KIO::PreviewJob(KFileItemList() << m_item, QSize(256, 256));
- job->setIgnoreMaximumSize(m_item.isLocalFile());
- if (job->ui()) {
- job->ui()->setWindow(qApp->activeWindow());
- }
- connect(job, SIGNAL(gotPreview(KFileItem,QPixmap)),
- this, SLOT(setPreviewPix(KFileItem,QPixmap)));
- connect(job, SIGNAL(failed(KFileItem)),
- this, SLOT(previewFailed()));
- }
- void ToolTipManager::setPreviewPix(const KFileItem& item,
- const QPixmap& pixmap)
- {
- if (!m_toolTipRequested || (m_item.url() != item.url())) {
- // No tooltip is requested anymore or an old preview has been received
- return;
- }
- if (pixmap.isNull()) {
- previewFailed();
- } else {
- m_fileMetaDataToolTip->setPreview(pixmap);
- if (!m_showToolTipTimer->isActive()) {
- showToolTip();
- }
- }
- }
- void ToolTipManager::previewFailed()
- {
- if (!m_toolTipRequested) {
- return;
- }
- const QPixmap pixmap = KIcon(m_item.iconName()).pixmap(128, 128);
- m_fileMetaDataToolTip->setPreview(pixmap);
- if (!m_showToolTipTimer->isActive()) {
- showToolTip();
- }
- }
- void ToolTipManager::slotMetaDataRequestFinished()
- {
- if (!m_toolTipRequested) {
- return;
- }
- m_metaDataRequested = false;
- if (!m_showToolTipTimer->isActive()) {
- showToolTip();
- }
- }
- void ToolTipManager::showToolTip()
- {
- Q_ASSERT(m_toolTipRequested);
- if (m_appliedWaitCursor) {
- QApplication::restoreOverrideCursor();
- m_appliedWaitCursor = false;
- }
- if (m_fileMetaDataToolTip->preview().isNull() || m_metaDataRequested) {
- Q_ASSERT(!m_appliedWaitCursor);
- QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
- m_appliedWaitCursor = true;
- return;
- }
- const QRect screen = QApplication::desktop()->screenGeometry(QCursor::pos());
- // Restrict tooltip size to current screen size when needed.
- // Because layout controlling widget doesn't respect widget's maximumSize property
- // (correct me if I'm wrong), we need to let layout do its work, then manually change
- // geometry if resulting widget doesn't fit the screen.
- // Step #1 - make sizeHint return calculated tooltip size
- m_fileMetaDataToolTip->layout()->setSizeConstraint(QLayout::SetFixedSize);
- m_fileMetaDataToolTip->adjustSize();
- QSize size = m_fileMetaDataToolTip->sizeHint();
- // Step #2 - correct tooltip size when needed
- if (size.width() > screen.width()) {
- size.setWidth(screen.width());
- }
- if (size.height() > screen.height()) {
- size.setHeight(screen.height());
- }
- // m_itemRect defines the area of the item, where the tooltip should be
- // shown. Per default the tooltip is shown centered at the bottom.
- // It must be assured that:
- // - the content is fully visible
- // - the content is not drawn inside m_itemRect
- const bool hasRoomToLeft = (m_itemRect.left() - size.width() - m_margin >= screen.left());
- const bool hasRoomToRight = (m_itemRect.right() + size.width() + m_margin <= screen.right());
- const bool hasRoomAbove = (m_itemRect.top() - size.height() - m_margin >= screen.top());
- const bool hasRoomBelow = (m_itemRect.bottom() + size.height() + m_margin <= screen.bottom());
- if (!hasRoomAbove && !hasRoomBelow && !hasRoomToLeft && !hasRoomToRight) {
- return;
- }
- int x, y;
- if (hasRoomBelow || hasRoomAbove) {
- x = qMax(screen.left(), m_itemRect.center().x() - size.width() / 2);
- if (x + size.width() >= screen.right()) {
- x = screen.right() - size.width() + 1;
- }
- if (hasRoomBelow) {
- y = m_itemRect.bottom() + m_margin;
- } else {
- y = m_itemRect.top() - size.height() - m_margin;
- }
- } else {
- Q_ASSERT(hasRoomToLeft || hasRoomToRight);
- if (hasRoomToRight) {
- x = m_itemRect.right() + m_margin;
- } else {
- x = m_itemRect.left() - size.width() - m_margin;
- }
- // Put the tooltip at the bottom of the screen. The x-coordinate has already
- // been adjusted, so that no overlapping with m_itemRect occurs.
- y = screen.bottom() - size.height() + 1;
- }
- // Step #3 - Alter tooltip geometry
- m_fileMetaDataToolTip->setFixedSize(size);
- m_fileMetaDataToolTip->layout()->setSizeConstraint(QLayout::SetNoConstraint);
- m_fileMetaDataToolTip->move(QPoint(x, y));
- m_fileMetaDataToolTip->show();
- m_toolTipRequested = false;
- // Start mouse over action
- // http://api.kde.org/4.x-api/kdelibs-apidocs/kio/html/classKFileItem.html
- // mimetype() and localPath()
- QObject *parent;
- QString program = "/usr/local/bin/MouseOverAction.sh";
- QStringList arguments;
- arguments << m_item.mimetype() << m_item.localPath();
- QProcess *startAction = new QProcess(parent);
- startAction->start(program, arguments);
- }
- #include "tooltipmanager.moc"
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