plasma-framework/applethandle.cpp
Aaron J. Seigo db730a36d9 add a little bit of snapping to the rotate at 90 degree intervals
svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=738148
2007-11-18 02:37:30 +00:00

324 lines
8.9 KiB
C++

/*
* 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/QPainter>
#include <KIcon>
#include <cmath>
#include "containment.h"
#include "applet.h"
namespace Plasma
{
AppletHandle::AppletHandle(Containment *parent, Applet *applet)
: QObject(),
QGraphicsItem(parent),
m_buttonsOnRight(false),
m_pressedButton(NoButton),
m_containment(parent),
m_applet(applet),
m_svg("widgets/iconbutton"),
m_opacity(0.0),
m_anim(FadeIn),
m_animId(0),
m_angle(0.0),
m_scale(1.0)
{
m_originalMatrix = m_applet->transform();
m_rect = m_applet->boundingRect();
m_rect = m_applet->mapToParent(m_rect).boundingRect();
const int requiredHeight = (HANDLE_WIDTH * 2) + m_applet->hasConfigurationInterface() ? + (ICON_SIZE * 4) : (ICON_SIZE * 3);
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 + ICON_MARGIN)) {
m_rect.adjust(0.0, 0.0, ICON_MARGIN + ICON_SIZE, 0.0);
m_buttonsOnRight = true;
} else {
m_rect.adjust(- ICON_MARGIN - ICON_SIZE, 0.0, 0.0, 0.0);
}
m_applet->setParentItem(this);
setAcceptsHoverEvents(true);
startFading(FadeIn);
}
AppletHandle::~AppletHandle()
{
QPointF center = m_applet->boundingRect().center();
// TODO: Keep the rotation only, to apply the scaling force
// a new pixel size to applets (avoid upscaling aliasing, and
// insane downscaling), probably requires support in the Applet class.
QTransform matrix = m_originalMatrix;
matrix.translate(center.x(), center.y());
matrix.rotateRadians(m_angle);
matrix.scale(m_scale, m_scale);
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);
m_svg.paint(painter, boundingRect(), "background");
m_svg.paint(painter, boundingRect(), "foreground-hover");
QPointF point = m_rect.topLeft();
if (m_buttonsOnRight) {
point += QPointF(m_rect.width() - ICON_SIZE - ICON_MARGIN, HANDLE_WIDTH);
} else {
point+= QPointF(HANDLE_WIDTH, 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->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 * 2 + ICON_MARGIN);
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 - ICON_MARGIN, HANDLE_WIDTH);
} else {
basePoint+= QPointF(HANDLE_WIDTH, HANDLE_WIDTH);
}
QPolygonF activeArea = QPolygonF(QRectF(basePoint, QSizeF(ICON_SIZE, ICON_SIZE)));
if (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 * 2 + ICON_MARGIN));
if (activeArea.containsPoint(point, Qt::OddEvenFill)) {
return RemoveButton;
}
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());
update();
}
}
void AppletHandle::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
ButtonType releasedAtButton = mapToButton(event->pos());
if (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) {
Phase::self()->animateItem(m_applet, Phase::Disappear);
forceDisappear();
}
}
m_pressedButton = NoButton;
update();
}
qreal _k_distanceForPoint(QPointF point)
{
return ::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 = ::atan2(vec1.y(), vec1.x());
qreal beta = ::atan2(vec2.y(), vec2.x());
return beta - alpha;
}
void AppletHandle::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
static const qreal snapAngle = 3.14159 / 2.0;
if (m_pressedButton == MoveButton) {
QPointF delta = event->pos()-event->lastPos();
setPos(pos()+delta);
} 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_angle, snapAngle)) < 0.15) {
m_angle = m_angle - remainder(m_angle, snapAngle);
}
m_scale = _k_distanceForPoint(event->pos()-center) / _k_distanceForPoint(pressPos-center);
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);
}
}
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::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);
}
}
#include "applethandle_p.moc"