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 <QGraphicsScene>
  22 #include <QGraphicsView>
  23 #include <QScrollBar>
  24 #include <QStyleOptionGraphicsItem>
  25 #include <QToolTip>
  26
  27 #include <KDebug>
  28 #include <KLocale>
  29
  30 #include "abstractgroupitem.h"
  31 #include "abstractclipitem.h"
  32 #include "kdenlivesettings.h"
  33 #include "customtrackscene.h"
  34
  35 AbstractGroupItem::AbstractGroupItem(double fps): QGraphicsItemGroup(), m_fps(fps) {
  36     setZValue(2);
  37     setFlags(QGraphicsItem::ItemClipsToShape | QGraphicsItem::ItemIsMovable | QGraphicsItem::ItemIsSelectable);
  38 }
  39
  40 int AbstractGroupItem::type() const {
  41     return GROUPWIDGET;
  42 }
  43
  44 const int AbstractGroupItem::track() const {
  45     return (int)(scenePos().y() / KdenliveSettings::trackheight());
  46 }
  47
  48 CustomTrackScene* AbstractGroupItem::projectScene() {
  49     if (scene()) return static_cast <CustomTrackScene*>(scene());
  50     return NULL;
  51 }
  52
  53 QPainterPath AbstractGroupItem::groupShape(QPointF offset) {
  54     QPainterPath path;
  55     QList<QGraphicsItem *> children = childItems();
  56     for (int i = 0; i < children.count(); i++) {
  57         if (children.at(i)->type() == AVWIDGET) {
  58             QRectF r(children.at(i)->sceneBoundingRect());
  59             r.translate(offset);
  60             path.addRect(r);
  61         }
  62     }
  63     return path;
  64 }
  65
  66 void AbstractGroupItem::addItem(QGraphicsItem * item) {
  67     addToGroup(item);
  68     //fixItemRect();
  69 }
  70
  71 void AbstractGroupItem::fixItemRect() {
  72     QPointF start = boundingRect().topLeft();
  73     if (start != QPointF(0, 0)) {
  74         translate(0 - start.x(), 0 - start.y());
  75         setPos(start);
  76     }
  77 }
  78
  79 // virtual
  80 void AbstractGroupItem::paint(QPainter *p, const QStyleOptionGraphicsItem *option, QWidget *) {
  81     p->fillRect(option->exposedRect, QColor(200, 100, 100, 100));
  82 }
  83
  84 //virtual
  85 QVariant AbstractGroupItem::itemChange(GraphicsItemChange change, const QVariant &value) {
  86     if (change == ItemPositionChange && scene()) {
  87         // calculate new position.
  88         const int trackHeight = KdenliveSettings::trackheight();
  89         QPointF newPos = value.toPointF();
  90         int xpos = projectScene()->getSnapPointForPos((int) newPos.x(), KdenliveSettings::snaptopoints());
  91         xpos = qMax(xpos, 0);
  92         newPos.setX(xpos);
  93
  94         QPointF start = pos();
  95         int startTrack = (start.y() + trackHeight / 2) / trackHeight;
  96         int newTrack = (newPos.y()) / trackHeight;
  97         //kDebug()<<"// GROUP NEW T:"<<newTrack<<",START T:"<<startTrack<<",MAX:"<<projectScene()->tracksCount() - 1;
  98         newTrack = qMin(newTrack, projectScene()->tracksCount() - (int)(boundingRect().height() + 5) / trackHeight);
  99         newTrack = qMax(newTrack, 0);
 100
 101         // Check if top item is a clip or a transition
 102         int offset = 0;
 103         int topTrack = -1;
 104         QList<QGraphicsItem *> children = childItems();
 105         for (int i = 0; i < children.count(); i++) {
 106             int currentTrack = (int)(children.at(i)->scenePos().y() / trackHeight);
 107             if (children.at(i)->type() == AVWIDGET) {
 108                 if (topTrack == -1 || currentTrack <= topTrack) {
 109                     offset = 0;
 110                     topTrack = currentTrack;
 111                 }
 112             } else if (children.at(i)->type() == TRANSITIONWIDGET) {
 113                 if (topTrack == -1 || currentTrack < topTrack) {
 114                     offset = (int)(trackHeight / 3 * 2 - 1);
 115                     topTrack = currentTrack;
 116                 }
 117             }
 118         }
 119         newPos.setY((int)((newTrack) * trackHeight) + offset);
 120         if (newPos == start) return start;
 121
 122         if (newPos.x() < 0) {
 123             // If group goes below 0, adjust position to 0
 124             return QPointF(pos().x() - start.x(), pos().y());
 125         }
 126
 127         QPainterPath shape = groupShape(newPos - pos());
 128         QList<QGraphicsItem*> collindingItems = scene()->items(shape, Qt::IntersectsItemShape);
 129         for (int i = 0; i < children.count(); i++) {
 130             collindingItems.removeAll(children.at(i));
 131         }
 132         if (collindingItems.isEmpty()) return newPos;
 133         else {
 134             bool forwardMove = newPos.x() > start.x();
 135             int offset = 0;
 136             const double width = sceneBoundingRect().width() + 1;
 137             for (int i = 0; i < collindingItems.count(); i++) {
 138                 QGraphicsItem *collision = collindingItems.at(i);
 139                 if (collision->type() == AVWIDGET) {
 140                     // Collision
 141                     //kDebug()<<"// COLLISION WIT:"<<collision->sceneBoundingRect();
 142                     if (newPos.y() != start.y()) {
 143                         // Track change results in collision, restore original position
 144                         return start;
 145                     }
 146                     AbstractClipItem *item = static_cast <AbstractClipItem *>(collision);
 147                     if (forwardMove) {
 148                         // Moving forward, determine best pos
 149                         QPainterPath clipPath;
 150                         clipPath.addRect(item->sceneBoundingRect());
 151                         QPainterPath res = shape.intersected(clipPath);
 152                         offset = qMax(offset, (int)(res.boundingRect().width() + 0.5));
 153                     } else {
 154                         // Moving backward, determine best pos
 155                         QPainterPath clipPath;
 156                         clipPath.addRect(item->sceneBoundingRect());
 157                         QPainterPath res = shape.intersected(clipPath);
 158                         offset = qMax(offset, (int)(res.boundingRect().width() + 0.5));
 159                     }
 160                 }
 161             }
 162             if (offset > 0) {
 163                 if (forwardMove) {
 164                     newPos.setX(newPos.x() - offset);
 165                 } else {
 166                     newPos.setX(newPos.x() + offset);
 167                 }
 168                 // If there is still a collision after our position adjust, restore original pos
 169                 collindingItems = scene()->items(groupShape(newPos - pos()), Qt::IntersectsItemShape);
 170                 for (int i = 0; i < children.count(); i++) {
 171                     collindingItems.removeAll(children.at(i));
 172                 }
 173                 for (int i = 0; i < collindingItems.count(); i++)
 174                     if (collindingItems.at(i)->type() == AVWIDGET) return pos();
 175             }
 176             return newPos;
 177         }
 178     }
 179     return QGraphicsItem::itemChange(change, value);
 180 }
 181