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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 <QtGui/QGraphicsSceneMouseEvent>
#include <QtGui/QLinearGradient>
#include <QtGui/QPainter>
#include <KColorScheme>
#include <KIcon>
#include <cmath>
#include <math.h>
#include "applet.h"
#include "containment.h"
#include "corona.h"
#include "applet.h"
#include "theme.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_buttonsOnRight(false),
m_pressedButton(NoButton),
m_containment(parent),
m_applet(applet),
m_opacity(0.0),
m_anim(FadeIn),
m_animId(0),
m_angle(0.0),
m_scale(1.0)
{
KColorScheme colors(QPalette::Active, KColorScheme::View, Theme::self()->colors());
m_gradientColor = colors.background(KColorScheme::NormalBackground).color();
QTransform originalMatrix = m_applet->transform();
QRectF rect(m_applet->boundingRect());
QPointF center = rect.center();
originalMatrix.translate(center.x(), center.y());
qreal cosine = originalMatrix.m11();
qreal sine = originalMatrix.m12();
m_originalAngle = _k_angleForPoints(QPointF(0, 0),
QPointF(1, 0),
QPointF(cosine, sine));
calculateSize();
m_applet->setParentItem(this);
connect(m_applet, SIGNAL(destroyed(QObject*)), this, SLOT(appletDestroyed()));
setAcceptsHoverEvents(true);
startFading(FadeIn);
}
AppletHandle::~AppletHandle()
{
if (!m_applet) {
return;
}
QRectF rect(m_applet->boundingRect());
QPointF center = rect.center();
if (m_scale > 0) {
const qreal newWidth = rect.width() * m_scale;
const qreal newHeight = rect.height() * m_scale;
m_applet->moveBy((rect.width() - newWidth) / 2, (rect.height() - newHeight) / 2);
m_applet->resize(newWidth, newHeight);
}
QTransform matrix;
matrix.translate(center.x(), center.y());
matrix.rotateRadians(m_originalAngle+m_angle);
matrix.translate(-center.x(), -center.y());
QPointF newPos = transform().inverted().map(m_applet->pos());
m_applet->setParentItem(m_containment);
m_applet->setPos(mapToParent(newPos));
m_applet->setTransform(matrix);
}
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);
painter->drawPath(Plasma::roundedRectangle(boundingRect(), 10));
painter->restore();
QPointF point = m_rect.topLeft();
if (m_buttonsOnRight) {
point += QPointF(m_rect.width() - ICON_SIZE - HANDLE_WIDTH, HANDLE_WIDTH);
} else {
point+= QPointF(HANDLE_WIDTH / 2, HANDLE_WIDTH);
}
QPointF shiftC;
QPointF shiftD;
QPointF shiftR;
switch(m_pressedButton)
{
case ConfigureButton:
shiftC = QPointF(2, 2);
break;
case RemoveButton:
shiftD = QPointF(2, 2);
break;
case RotateButton:
shiftR = QPointF(2, 2);
break;
default:
break;
}
if (m_applet && m_applet->hasConfigurationInterface()) {
painter->drawPixmap(point + shiftC, KIcon("configure").pixmap(ICON_SIZE, ICON_SIZE));
point += QPointF(0.0, ICON_SIZE + ICON_MARGIN);
}
painter->drawPixmap(point + shiftR, KIcon("transform-rotate").pixmap(ICON_SIZE, ICON_SIZE));
point += QPointF(0.0, ICON_SIZE + ICON_MARGIN * 2);
painter->drawPixmap(point + shiftD, KIcon("edit-delete").pixmap(ICON_SIZE, ICON_SIZE));
painter->restore();
}
AppletHandle::ButtonType AppletHandle::mapToButton(const QPointF &point) const
{
QPointF basePoint = m_rect.topLeft();
if (m_buttonsOnRight) {
basePoint+= QPointF(m_rect.width() - ICON_SIZE, HANDLE_WIDTH);
} else {
basePoint+= QPointF(HANDLE_WIDTH, HANDLE_WIDTH);
}
QPolygonF activeArea = QPolygonF(QRectF(basePoint, QSizeF(ICON_SIZE, ICON_SIZE)));
if (m_applet && m_applet->hasConfigurationInterface()) {
if (activeArea.containsPoint(point, Qt::OddEvenFill)) {
return ConfigureButton;
}
activeArea.translate(QPointF(0.0, ICON_SIZE + ICON_MARGIN));
}
if (activeArea.containsPoint(point, Qt::OddEvenFill)) {
return RotateButton;
}
activeArea.translate(QPointF(0.0, ICON_SIZE + ICON_MARGIN * 2));
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 (event->button() == Qt::LeftButton) {
m_pressedButton = mapToButton(event->pos());
event->accept();
update();
return;
}
QGraphicsItem::mousePressEvent(event);
}
void AppletHandle::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
ButtonType releasedAtButton = mapToButton(event->pos());
if (m_applet && event->button() == Qt::LeftButton && m_pressedButton==releasedAtButton) {
if (m_pressedButton == ConfigureButton) {
//FIXME: Remove this call once the configuration management change was done
m_containment->emitLaunchActivated();
m_applet->showConfigurationInterface();
} else if (m_pressedButton == RemoveButton) {
forceDisappear();
Phase::self()->animateItem(m_applet, Phase::Disappear);
}
}
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);
}
else if (m_pressedButton == MoveButton) {
QPointF delta = event->pos()-event->lastPos();
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
QPointF scenePosition = scenePos();
kDebug() << "moving to other containment with position" << event->pos() << event->scenePos();
kDebug() << "position before reparenting" << pos() << scenePos();
m_containment = containments[i];
//m_containment->addChild(m_applet);
//setParentItem(containments[i]);
m_containment->addApplet(m_applet);
setParentItem(m_containment);
m_applet->setParentItem(this);
setPos(m_containment->mapFromScene(scenePosition));
update();
break;
}
}
}
}
} else if (m_pressedButton == RotateButton) {
if (_k_distanceForPoint(event->pos()-event->lastPos()) <= 1.0) {
return;
}
QPointF pressPos = mapFromScene(event->buttonDownScenePos(Qt::LeftButton));
QRectF rect = QRectF(m_applet->pos(), m_applet->size());
QPointF center = rect.center();
m_angle = _k_angleForPoints(center, pressPos, event->pos());
if (fabs(remainder(m_originalAngle+m_angle, snapAngle)) < 0.15) {
m_angle = m_angle - remainder(m_originalAngle+m_angle, snapAngle);
}
qreal newScale = _k_distanceForPoint(event->pos()-center) / _k_distanceForPoint(pressPos-center);
if (qAbs(newScale-1.0)<=0.1) {
newScale = 1.0;
}
qreal w = m_applet->size().width();
qreal h = m_applet->size().height();
QSizeF min = m_applet->minimumSize();
QSizeF max = m_applet->maximumSize();
//FIXME: this code will only work if we are keeping the aspect ratio, as we currently do
// as it resets only on the width, which will break if we allow resizing of width
// and height independantly
if (newScale * w < min.width() || newScale * h < min.height()) {
m_scale = min.width() / w;
} else if (newScale * w > max.width() && newScale * h > max.height()) {
m_scale = max.width() / w;
} else {
m_scale = newScale;
}
QTransform matrix;
matrix.translate(center.x(), center.y());
matrix.rotateRadians(m_angle);
matrix.scale(m_scale, m_scale);
matrix.translate(-center.x(), -center.y());
setTransform(matrix);
} else {
QGraphicsItem::mouseMoveEvent(event);
}
}
QVariant AppletHandle::itemChange(GraphicsItemChange change, const QVariant &value)
{
if (change == ItemPositionHasChanged && m_applet) {
m_applet->constraintsUpdated(Plasma::LocationConstraint);
}
return QGraphicsItem::itemChange(change, value);
}
void AppletHandle::hoverEnterEvent(QGraphicsSceneHoverEvent *event)
{
Q_UNUSED(event);
startFading(FadeIn);
}
void AppletHandle::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
{
Q_UNUSED(event);
startFading(FadeOut);
}
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) {
emit disappearDone(this);
}
update();
}
void AppletHandle::appletDestroyed()
{
m_applet = 0;
deleteLater();
}
void AppletHandle::appletResized()
{
prepareGeometryChange();
calculateSize();
update();
}
void AppletHandle::startFading(FadeType anim)
{
if (m_animId!=0) {
Phase::self()->stopCustomAnimation(m_animId);
}
qreal time = 250;
if (anim==FadeIn) {
time *= 1.0-m_opacity;
} else {
time *= m_opacity;
}
m_anim = anim;
m_animId = Phase::self()->customAnimation(40, (int)time,
Phase::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();
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"
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