git.sesse.net Git - kdenlive/blob - src/abstractgroupitem.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2008 by Marco Gittler (g.marco@freenet.de)              *
   3  *   Copyright (C) 2008 by Jean-Baptiste Mardelle (jb@kdenlive.org)        *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA          *
  19  ***************************************************************************/
  20
  21 #include "abstractgroupitem.h"
  22 #include "abstractclipitem.h"
  23 #include "kdenlivesettings.h"
  24 #include "customtrackscene.h"
  25
  26 #include <KDebug>
  27
  28 #include <QPainter>
  29 #include <QStyleOptionGraphicsItem>
  30
  31
  32 AbstractGroupItem::AbstractGroupItem(double fps): QGraphicsItemGroup(), m_fps(fps) {
  33     setZValue(2);
  34     setFlags(QGraphicsItem::ItemClipsToShape | QGraphicsItem::ItemIsMovable | QGraphicsItem::ItemIsSelectable);
  35 }
  36
  37 int AbstractGroupItem::type() const {
  38     return GROUPWIDGET;
  39 }
  40
  41 const int AbstractGroupItem::track() const {
  42     return (int)(scenePos().y() / KdenliveSettings::trackheight());
  43 }
  44
  45 CustomTrackScene* AbstractGroupItem::projectScene() {
  46     if (scene()) return static_cast <CustomTrackScene*>(scene());
  47     return NULL;
  48 }
  49
  50 QPainterPath AbstractGroupItem::groupShape(QPointF offset) {
  51     QPainterPath path;
  52     QList<QGraphicsItem *> children = childItems();
  53     for (int i = 0; i < children.count(); i++) {
  54         if (children.at(i)->type() == AVWIDGET) {
  55             QRectF r(children.at(i)->sceneBoundingRect());
  56             r.translate(offset);
  57             path.addRect(r);
  58         }
  59     }
  60     return path;
  61 }
  62
  63 void AbstractGroupItem::addItem(QGraphicsItem * item) {
  64     addToGroup(item);
  65     //fixItemRect();
  66 }
  67
  68 void AbstractGroupItem::fixItemRect() {
  69     QPointF start = boundingRect().topLeft();
  70     if (start != QPointF(0, 0)) {
  71         translate(0 - start.x(), 0 - start.y());
  72         setPos(start);
  73     }
  74 }
  75
  76 // virtual
  77 void AbstractGroupItem::paint(QPainter *p, const QStyleOptionGraphicsItem *option, QWidget *) {
  78     p->fillRect(option->exposedRect, QColor(200, 100, 100, 100));
  79 }
  80
  81 //virtual
  82 QVariant AbstractGroupItem::itemChange(GraphicsItemChange change, const QVariant &value) {
  83     if (change == ItemPositionChange && scene()) {
  84         // calculate new position.
  85         const int trackHeight = KdenliveSettings::trackheight();
  86         QPointF newPos = value.toPointF();
  87         int xpos = projectScene()->getSnapPointForPos((int) newPos.x(), KdenliveSettings::snaptopoints());
  88         xpos = qMax(xpos, 0);
  89         newPos.setX(xpos);
  90
  91         QPointF start = pos();
  92         int startTrack = (start.y() + trackHeight / 2) / trackHeight;
  93         int newTrack = (newPos.y()) / trackHeight;
  94         //kDebug()<<"// GROUP NEW T:"<<newTrack<<",START T:"<<startTrack<<",MAX:"<<projectScene()->tracksCount() - 1;
  95         newTrack = qMin(newTrack, projectScene()->tracksCount() - (int)(boundingRect().height() + 5) / trackHeight);
  96         newTrack = qMax(newTrack, 0);
  97
  98         // Check if top item is a clip or a transition
  99         int offset = 0;
 100         int topTrack = -1;
 101         QList<QGraphicsItem *> children = childItems();
 102         for (int i = 0; i < children.count(); i++) {
 103             int currentTrack = (int)(children.at(i)->scenePos().y() / trackHeight);
 104             if (children.at(i)->type() == AVWIDGET) {
 105                 if (topTrack == -1 || currentTrack <= topTrack) {
 106                     offset = 0;
 107                     topTrack = currentTrack;
 108                 }
 109             } else if (children.at(i)->type() == TRANSITIONWIDGET) {
 110                 if (topTrack == -1 || currentTrack < topTrack) {
 111                     offset = (int)(trackHeight / 3 * 2 - 1);
 112                     topTrack = currentTrack;
 113                 }
 114             }
 115         }
 116         newPos.setY((int)((newTrack) * trackHeight) + offset);
 117         if (newPos == start) return start;
 118
 119         if (newPos.x() < 0) {
 120             // If group goes below 0, adjust position to 0
 121             return QPointF(pos().x() - start.x(), pos().y());
 122         }
 123
 124         QPainterPath shape = groupShape(newPos - pos());
 125         QList<QGraphicsItem*> collindingItems = scene()->items(shape, Qt::IntersectsItemShape);
 126         for (int i = 0; i < children.count(); i++) {
 127             collindingItems.removeAll(children.at(i));
 128         }
 129         if (collindingItems.isEmpty()) return newPos;
 130         else {
 131             bool forwardMove = newPos.x() > start.x();
 132             int offset = 0;
 133             const double width = sceneBoundingRect().width() + 1;
 134             for (int i = 0; i < collindingItems.count(); i++) {
 135                 QGraphicsItem *collision = collindingItems.at(i);
 136                 if (collision->type() == AVWIDGET) {
 137                     // Collision
 138                     //kDebug()<<"// COLLISION WIT:"<<collision->sceneBoundingRect();
 139                     if (newPos.y() != start.y()) {
 140                         // Track change results in collision, restore original position
 141                         return start;
 142                     }
 143                     AbstractClipItem *item = static_cast <AbstractClipItem *>(collision);
 144                     if (forwardMove) {
 145                         // Moving forward, determine best pos
 146                         QPainterPath clipPath;
 147                         clipPath.addRect(item->sceneBoundingRect());
 148                         QPainterPath res = shape.intersected(clipPath);
 149                         offset = qMax(offset, (int)(res.boundingRect().width() + 0.5));
 150                     } else {
 151                         // Moving backward, determine best pos
 152                         QPainterPath clipPath;
 153                         clipPath.addRect(item->sceneBoundingRect());
 154                         QPainterPath res = shape.intersected(clipPath);
 155                         offset = qMax(offset, (int)(res.boundingRect().width() + 0.5));
 156                     }
 157                 }
 158             }
 159             if (offset > 0) {
 160                 if (forwardMove) {
 161                     newPos.setX(newPos.x() - offset);
 162                 } else {
 163                     newPos.setX(newPos.x() + offset);
 164                 }
 165                 // If there is still a collision after our position adjust, restore original pos
 166                 collindingItems = scene()->items(groupShape(newPos - pos()), Qt::IntersectsItemShape);
 167                 for (int i = 0; i < children.count(); i++) {
 168                     collindingItems.removeAll(children.at(i));
 169                 }
 170                 for (int i = 0; i < collindingItems.count(); i++)
 171                     if (collindingItems.at(i)->type() == AVWIDGET) return pos();
 172             }
 173             return newPos;
 174         }
 175     }
 176     return QGraphicsItemGroup::itemChange(change, value);
 177 }
 178