plasma-framework/applethandle.cpp

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/*
* Copyright 2007 by Kevin Ottens <ervin@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 "applethandle_p.h"
#include <QApplication>
#include <QtGui/QGraphicsSceneMouseEvent>
#include <QtGui/QLinearGradient>
#include <QtGui/QPainter>
#include <QtGui/QApplication>
#include <KColorScheme>
#include <KGlobalSettings>
#include <KIcon>
#include <cmath>
#include <math.h>
#include "applet.h"
#include "containment.h"
#include "corona.h"
#include "theme.h"
#include "view.h"
namespace Plasma
{
qreal _k_angleForPoints(const QPointF &center, const QPointF &pt1, const QPointF &pt2);
AppletHandle::AppletHandle(Containment *parent, Applet *applet)
: QObject(),
QGraphicsItem(parent),
m_pressedButton(NoButton),
m_containment(parent),
m_applet(applet),
m_opacity(0.0),
m_anim(FadeIn),
m_animId(0),
m_angle(0.0),
m_tempAngle(0.0),
m_scaleWidth(1.0),
m_scaleHeight(1.0),
m_buttonsOnRight(false),
m_pendingFade(false)
{
KColorScheme colorScheme(QPalette::Active, KColorScheme::View, Theme::defaultTheme()->colorScheme());
m_gradientColor = colorScheme.background(KColorScheme::NormalBackground).color();
QTransform originalMatrix = m_applet->transform();
QRectF rect(m_applet->contentsRect());
QPointF center = rect.center();
originalMatrix.translate(center.x(), center.y());
qreal cosine = originalMatrix.m11();
qreal sine = originalMatrix.m12();
m_angle = _k_angleForPoints(QPointF(0, 0),
QPointF(1, 0),
QPointF(cosine, sine));
m_applet->resetTransform();
calculateSize();
m_applet->setParentItem(this);
rect = QRectF(m_applet->pos(), m_applet->size());
center = rect.center();
QTransform matrix;
matrix.translate(center.x(), center.y());
matrix.rotateRadians(m_angle);
matrix.translate(-center.x(), -center.y());
setTransform(matrix);
m_hoverTimer = new QTimer(this);
m_hoverTimer->setSingleShot(true);
m_hoverTimer->setInterval(333);
connect(m_hoverTimer, SIGNAL(timeout()), this, SLOT(fadeIn()));
connect(m_applet, SIGNAL(destroyed(QObject*)), this, SLOT(appletDestroyed()));
setAcceptsHoverEvents(true);
m_hoverTimer->start();
setZValue(m_applet->zValue());
}
AppletHandle::~AppletHandle()
{
if (m_applet) {
m_applet->removeSceneEventFilter(this);
QRectF rect = QRectF(m_applet->pos(), m_applet->size());
QPointF center = m_applet->mapFromParent(rect.center());
QPointF newPos = transform().inverted().map(m_applet->pos());
m_applet->setPos(mapToParent(newPos));
QTransform matrix;
matrix.translate(center.x(), center.y());
matrix.rotateRadians(m_angle);
matrix.translate(-center.x(), -center.y());
m_applet->setTransform(matrix);
m_applet->setParentItem(m_containment);
m_applet->update(); // re-render the background, now we've transformed the applet
}
}
Applet *AppletHandle::applet() const
{
return m_applet;
}
QRectF Plasma::AppletHandle::boundingRect() const
{
return m_rect;
}
void AppletHandle::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
Q_UNUSED(option);
Q_UNUSED(widget);
painter->save();
painter->setOpacity(m_opacity);
painter->save();
painter->setOpacity(m_opacity * 0.4);
painter->setPen(Qt::NoPen);
painter->setRenderHints(QPainter::Antialiasing);
QLinearGradient gr(boundingRect().topLeft(), boundingRect().bottomRight());
gr.setColorAt(0, m_gradientColor);
gr.setColorAt(0.1, KColorScheme::shade(m_gradientColor, KColorScheme::LightShade));
gr.setColorAt(1, KColorScheme::shade(m_gradientColor, KColorScheme::DarkShade));
painter->setBrush(gr);
QPainterPath path = Plasma::roundedRectangle(boundingRect(), 10);
if (m_applet) {
QPainterPath shape = m_applet->shape();
if (!shape.isEmpty()) {
path = path.subtracted(m_applet->mapToParent(m_applet->shape()));
}
}
painter->drawPath(path);
painter->restore();
//XXX this code is duplicated in the next function
QPointF basePoint = m_rect.topLeft() + QPointF(HANDLE_WIDTH / 2, HANDLE_WIDTH);
QPointF step = QPointF(0, ICON_SIZE + ICON_MARGIN);
QPointF separator = step + QPointF(0, ICON_MARGIN);
if (m_buttonsOnRight) {
basePoint += QPointF(m_rect.width() - ICON_SIZE - HANDLE_WIDTH, 0);
}
//end duplicate code
QPointF shiftC;
QPointF shiftD;
QPointF shiftR;
QPointF shiftM;
switch(m_pressedButton)
{
case ConfigureButton:
shiftC = QPointF(2, 2);
break;
case RemoveButton:
shiftD = QPointF(2, 2);
break;
case RotateButton:
shiftR = QPointF(2, 2);
break;
case ResizeButton:
shiftM = QPointF(2, 2);
break;
default:
break;
}
painter->drawPixmap(basePoint + shiftM, KIcon("transform-move").pixmap(ICON_SIZE, ICON_SIZE)); //FIXME no transform-resize icon
basePoint += step;
painter->drawPixmap(basePoint + shiftR, KIcon("transform-rotate").pixmap(ICON_SIZE, ICON_SIZE));
if (m_applet && m_applet->hasConfigurationInterface()) {
basePoint += step;
painter->drawPixmap(basePoint + shiftC, KIcon("configure").pixmap(ICON_SIZE, ICON_SIZE));
}
basePoint += separator;
painter->drawPixmap(basePoint + shiftD, KIcon("edit-delete").pixmap(ICON_SIZE, ICON_SIZE));
painter->restore();
}
AppletHandle::ButtonType AppletHandle::mapToButton(const QPointF &point) const
{
//XXX this code is duplicated in the prev. function
QPointF basePoint = m_rect.topLeft() + QPointF(HANDLE_WIDTH / 2, HANDLE_WIDTH);
QPointF step = QPointF(0, ICON_SIZE + ICON_MARGIN);
QPointF separator = step + QPointF(0, ICON_MARGIN);
if (m_buttonsOnRight) {
basePoint += QPointF(m_rect.width() - ICON_SIZE - HANDLE_WIDTH, 0);
}
//end duplicate code
QPolygonF activeArea = QPolygonF(QRectF(basePoint, QSizeF(ICON_SIZE, ICON_SIZE)));
if (activeArea.containsPoint(point, Qt::OddEvenFill)) {
return ResizeButton;
}
activeArea.translate(step);
if (activeArea.containsPoint(point, Qt::OddEvenFill)) {
return RotateButton;
}
if (m_applet && m_applet->hasConfigurationInterface()) {
activeArea.translate(step);
if (activeArea.containsPoint(point, Qt::OddEvenFill)) {
return ConfigureButton;
}
}
activeArea.translate(separator);
if (activeArea.containsPoint(point, Qt::OddEvenFill)) {
return RemoveButton;
}
return MoveButton;
//return m_applet->mapToParent(m_applet->shape()).contains(point) ? NoButton : MoveButton;
}
void AppletHandle::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
if (m_pendingFade) {
//m_pendingFade = false;
return;
}
if (event->button() == Qt::LeftButton) {
m_pressedButton = mapToButton(event->pos());
//kDebug() << "button pressed:" << m_pressedButton;
if (m_pressedButton != NoButton) {
// when the mouse goes over a window, the applet is likely to
// get a hover out event that we really don't want to respond to
// so while we have a button pressed we intercept these events
// and handle them ourselves here in AppletHandle
m_applet->installSceneEventFilter(this);
m_applet->raise();
setZValue(m_applet->zValue());
}
event->accept();
update();
return;
}
QGraphicsItem::mousePressEvent(event);
}
void AppletHandle::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
//kDebug() << "button pressed:" << m_pressedButton << ", fade pending?" << m_pendingFade;
if (m_applet) {
m_applet->removeSceneEventFilter(this);
}
if (m_pendingFade) {
startFading(FadeOut);
m_pendingFade = false;
}
ButtonType releasedAtButton = mapToButton(event->pos());
if (m_applet && event->button() == Qt::LeftButton) {
switch (m_pressedButton) {
case ResizeButton:
case RotateButton: {
if (m_scaleWidth > 0 && m_scaleHeight > 0) {
QRectF rect(m_applet->boundingRect());
const qreal newWidth = rect.width() * m_scaleWidth;
const qreal newHeight = rect.height() * m_scaleHeight;
m_applet->resetTransform();
m_applet->resize(newWidth, newHeight);
scale(1.0/m_scaleWidth, 1.0/m_scaleHeight);
moveBy((rect.width() - newWidth) / 2, (rect.height() - newHeight) / 2);
m_scaleWidth = m_scaleHeight = 0;
}
QRectF rect = QRectF(m_applet->pos(), m_applet->size());
QPointF center = rect.center();
m_angle += m_tempAngle;
m_tempAngle = 0;
QTransform matrix;
matrix.translate(center.x(), center.y());
matrix.rotateRadians(m_angle);
matrix.translate(-center.x(), -center.y());
setTransform(matrix);
m_applet->update();
break;
}
case ConfigureButton:
//FIXME: Remove this call once the configuration management change was done
if (m_pressedButton == releasedAtButton) {
m_applet->showConfigurationInterface();
}
break;
case RemoveButton:
if (m_pressedButton == releasedAtButton) {
forceDisappear();
Animator::self()->animateItem(m_applet, Animator::DisappearAnimation);
}
break;
case MoveButton: {
//find out if we were dropped on a panel or something
QWidget *w = QApplication::topLevelAt(event->screenPos());
kDebug() << "move to widget" << w;
if (w) {
Plasma::View *v = qobject_cast<Plasma::View *>(w);
if (v) {
Containment *c = v->containment();
//XXX the dashboard view won't give us a containment. if it did, this could
//break shit.
if (c && c != m_containment) {
//we actually have been dropped on another containment, so move there
//we have a screenpos, we need a scenepos
//FIXME how reliable is this transform?
QPoint pos = v->mapFromGlobal(event->screenPos());
switchContainment(c, v->mapToScene(pos));
}
}
}
break;
}
default:
break;
}
}
m_pressedButton = NoButton;
update();
}
qreal _k_distanceForPoint(QPointF point)
{
return std::sqrt(point.x()*point.x()+point.y()*point.y());
}
qreal _k_angleForPoints(const QPointF &center, const QPointF &pt1, const QPointF &pt2)
{
QPointF vec1 = pt1 - center;
QPointF vec2 = pt2 - center;
qreal alpha = std::atan2(vec1.y(), vec1.x());
qreal beta = std::atan2(vec2.y(), vec2.x());
return beta - alpha;
}
void AppletHandle::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
static const qreal snapAngle = M_PI_2 /* $i 3.14159 / 2.0 */;
if (!m_applet) {
QGraphicsItem::mouseMoveEvent(event);
return;
}
QPointF curPos = transform().map(event->pos());
QPointF lastPos = transform().map(event->lastPos());
QPointF delta = curPos-lastPos;
if (m_pressedButton == MoveButton) {
setPos(pos()+delta);
// test for containment change
if (!m_containment->sceneBoundingRect().contains(event->scenePos())) {
// see which containment it belongs to
Corona * corona = qobject_cast<Corona*>(scene());
if (corona) {
QList<Containment*> containments = corona->containments();
for (int i = 0; i < containments.size(); ++i) {
if (containments[i]->sceneBoundingRect().contains(event->scenePos())) {
// add the applet to the new containment
// and take it from the old one
//kDebug() << "moving to other containment with position" << pos() << event->scenePos();
//kDebug() << "position before reparenting" << pos() << scenePos();
switchContainment(containments[i], scenePos());
break;
}
}
}
}
} else if (m_pressedButton == RotateButton ||
m_pressedButton == ResizeButton) {
if (_k_distanceForPoint(delta) <= 1.0) {
return;
}
QPointF pressPos = mapFromScene(event->buttonDownScenePos(Qt::LeftButton));
QRectF rect = QRectF(m_applet->pos(), m_applet->size());
QPointF center = rect.center();
if (m_pressedButton == RotateButton) {
m_tempAngle = _k_angleForPoints(center, pressPos, event->pos());
if (fabs(remainder(m_angle+m_tempAngle, snapAngle)) < 0.15) {
m_tempAngle = m_tempAngle - remainder(m_angle+m_tempAngle, snapAngle);
}
m_scaleWidth = m_scaleHeight = 1.0;
} else {
qreal w = m_applet->size().width();
qreal h = m_applet->size().height();
QSizeF min = m_applet->minimumSize();
QSizeF max = m_applet->maximumSize();
// If the applet doesn't have a minimum size, calculate based on a
// minimum content area size of 16x16
if (min.isEmpty()) {
min = m_applet->boundingRect().size() - m_applet->boundingRect().size();
min += QSizeF(16, 16);
}
bool ignoreAspectRatio = m_applet->aspectRatioMode() == Plasma::IgnoreAspectRatio;
if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
ignoreAspectRatio = !ignoreAspectRatio;
}
if (ignoreAspectRatio) {
// free resizing
qreal newScaleWidth = 0;
qreal newScaleHeight = 0;
QPointF startDistance(pressPos - center);
QPointF currentDistance(event->pos() - center);
newScaleWidth = currentDistance.x() / startDistance.x();
newScaleHeight = currentDistance.y() / startDistance.y();
if (qAbs(w - (newScaleWidth * w)) <= KGlobalSettings::dndEventDelay()) {
newScaleWidth = 1.0;
}
if (qAbs(h - (newScaleHeight * h)) <= KGlobalSettings::dndEventDelay()) {
newScaleHeight = 1.0;
}
if (newScaleHeight * h < min.height()) {
m_scaleHeight = min.height() / h;
} else if (newScaleHeight * h > max.height()) {
m_scaleHeight = max.height() / h;
} else {
m_scaleHeight = newScaleHeight;
}
if (newScaleWidth * w < min.width()) {
m_scaleWidth = min.width() / w;
} else if (newScaleWidth * w > max.width()) {
m_scaleWidth = max.width() / w;
} else {
m_scaleWidth = newScaleWidth;
}
} else {
// maintain aspect ratio
qreal newScale = 0;
newScale = _k_distanceForPoint(event->pos()-center) / _k_distanceForPoint(pressPos-center);
if (qAbs(h - (newScale * h)) <= KGlobalSettings::dndEventDelay()) {
newScale = 1.0;
}
if (newScale * w < min.width() || newScale * h < min.height()) {
m_scaleWidth = m_scaleHeight = qMax(min.width() / w, min.height() / h);
} else if (newScale * w > max.width() && newScale * h > max.height()) {
m_scaleWidth = m_scaleHeight = qMin(max.width() / w, max.height() / h);
} else {
m_scaleHeight = m_scaleWidth = newScale;
}
}
}
QTransform matrix;
matrix.translate(center.x(), center.y());
matrix.rotateRadians(m_angle+m_tempAngle);
matrix.scale(m_scaleWidth, m_scaleHeight);
matrix.translate(-center.x(), -center.y());
setTransform(matrix);
} else {
QGraphicsItem::mouseMoveEvent(event);
}
}
//pos relative to scene
void AppletHandle::switchContainment(Containment *containment, const QPointF &pos)
{
Applet *applet=m_applet;
switch (containment->containmentType()) {
case Containment::PanelContainment:
kDebug() << "panel";
//we need to fully disassociate the applet and handle, then kill the handle
forceDisappear(); //takes care of event filter and killing handle
m_applet=0; //make sure we don't try to act on the applet again
applet->disconnect(this); //make sure the applet doesn't tell us to do anything
containment->addApplet(applet, containment->mapFromScene(pos));
break;
default: //FIXME assuming everything else behaves like desktop
kDebug() << "desktop";
m_containment = containment;
containment->addApplet(m_applet);
setParentItem(containment);
m_applet->setParentItem(this);
setPos(containment->mapFromScene(pos));
//setPos(pos);
}
update();
}
QVariant AppletHandle::itemChange(GraphicsItemChange change, const QVariant &value)
{
if (change == ItemPositionHasChanged && m_applet) {
m_applet->updateConstraints(Plasma::LocationConstraint);
}
return QGraphicsItem::itemChange(change, value);
}
void AppletHandle::hoverEnterEvent(QGraphicsSceneHoverEvent *event)
{
Q_UNUSED(event);
//kDebug() << "hover enter";
m_hoverTimer->start();
}
void AppletHandle::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
{
Q_UNUSED(event);
//kDebug() << "hover leave" << m_pressedButton;
m_hoverTimer->stop();
if (m_pressedButton != NoButton) {
m_pendingFade = true;
} else {
startFading(FadeOut);
}
}
bool AppletHandle::sceneEventFilter(QGraphicsItem *watched, QEvent *event)
{
if (watched == m_applet && event->type() == QEvent::GraphicsSceneHoverLeave) {
hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent*>(event));
return true;
}
return false;
}
void AppletHandle::fadeAnimation(qreal progress)
{
qreal endOpacity = 1.0;
if (m_anim == FadeOut) {
endOpacity = 0.0;
}
m_opacity += (endOpacity - m_opacity) * progress;
if (progress >= 1.0 && m_anim == FadeOut) {
if (m_applet) {
m_applet->removeSceneEventFilter(this);
}
emit disappearDone(this);
}
update();
}
void AppletHandle::fadeIn()
{
startFading(FadeIn);
}
void AppletHandle::appletDestroyed()
{
m_applet = 0;
deleteLater();
}
void AppletHandle::appletResized()
{
prepareGeometryChange();
calculateSize();
update();
}
void AppletHandle::startFading(FadeType anim)
{
if (m_animId != 0) {
Animator::self()->stopCustomAnimation(m_animId);
}
m_anim = anim;
qreal time = 250;
if (anim == FadeOut && m_hoverTimer->isActive()) {
// fading out before we've started fading in
m_hoverTimer->stop();
fadeAnimation(1.0);
return;
}
if (m_applet) {
m_applet->removeSceneEventFilter(this);
}
if (anim == FadeIn) {
time *= 1.0 - m_opacity;
} else {
time *= m_opacity;
}
m_animId = Animator::self()->customAnimation(40, (int)time, Animator::EaseInOutCurve, this, "fadeAnimation");
}
void AppletHandle::forceDisappear()
{
setAcceptsHoverEvents(false);
startFading(FadeOut);
}
void AppletHandle::calculateSize()
{
m_rect = m_applet->boundingRect();
m_rect = m_applet->mapToParent(m_rect).boundingRect();
//XXX remember to update this if the number of buttons changes
const int requiredHeight = (HANDLE_WIDTH * 2) + m_applet->hasConfigurationInterface() ?
((ICON_SIZE + ICON_MARGIN) * 4) :
((ICON_SIZE + ICON_MARGIN) * 3) +
ICON_MARGIN; // that last margin is blank space before the close button
if (m_rect.height() < requiredHeight) {
float delta = requiredHeight - m_rect.height();
delta = delta/2.0;
if (delta > 0.0) {
m_rect.adjust(0.0, -delta, 0.0, delta);
}
}
m_rect.adjust(-HANDLE_WIDTH, -HANDLE_WIDTH, HANDLE_WIDTH, HANDLE_WIDTH);
if (m_applet->pos().x() <= ((HANDLE_WIDTH * 2) + ICON_SIZE)) {
m_rect.adjust(0.0, 0.0, ICON_SIZE, 0.0);
m_buttonsOnRight = true;
} else {
m_rect.adjust(- ICON_SIZE, 0.0, 0.0, 0.0);
}
}
}
#include "applethandle_p.moc"