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progressspinnerdelegate.cpp
1 /*
2  Copyright (C) 2010 Klarälvdalens Datakonsult AB,
3  a KDAB Group company, info@kdab.net,
4  author Stephen Kelly <stephen@kdab.com>
5 
6  This library is free software; you can redistribute it and/or modify it
7  under the terms of the GNU Library General Public License as published by
8  the Free Software Foundation; either version 2 of the License, or (at your
9  option) any later version.
10 
11  This library is distributed in the hope that it will be useful, but WITHOUT
12  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
14  License for more details.
15 
16  You should have received a copy of the GNU Library General Public License
17  along with this library; see the file COPYING.LIB. If not, write to the
18  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19  02110-1301, USA.
20 */
21 
22 #include "progressspinnerdelegate_p.h"
23 
24 #include "entitytreemodel.h"
25 
26 #include <QTimerEvent>
27 #include <QAbstractItemView>
28 
29 using namespace Akonadi;
30 
31 DelegateAnimator::DelegateAnimator(QAbstractItemView *view)
32  : QObject(view)
33  , m_view(view)
34  , m_timerId(-1)
35 {
36  m_pixmapSequence = KPixmapSequence(QLatin1String("process-working"), 22);
37 }
38 
39 void DelegateAnimator::push(const QModelIndex &index)
40 {
41  if (m_animations.isEmpty()) {
42  m_timerId = startTimer(200);
43  }
44  m_animations.insert(Animation(index));
45 }
46 
47 void DelegateAnimator::pop(const QModelIndex &index)
48 {
49  if (m_animations.remove(Animation(index))) {
50  if (m_animations.isEmpty() && m_timerId != -1) {
51  killTimer(m_timerId);
52  m_timerId = -1;
53  }
54  }
55 }
56 
57 void DelegateAnimator::timerEvent(QTimerEvent *event)
58 {
59  if (!(event->timerId() == m_timerId && m_view)) {
60  return QObject::timerEvent(event);
61  }
62 
63  QRegion region;
64  foreach (const Animation &animation, m_animations) {
65  // Check if loading is finished (we might not be notified, if the index is scrolled out of view)
66  const QVariant fetchState = animation.index.data(Akonadi::EntityTreeModel::FetchStateRole);
67  if (fetchState.toInt() != Akonadi::EntityTreeModel::FetchingState) {
68  pop(animation.index);
69  continue;
70  }
71 
72  // This repaints the entire delegate (icon and text).
73  // TODO: See if there's a way to repaint only part of it (the icon).
74  animation.nextFrame();
75  const QRect rect = m_view->visualRect(animation.index);
76  region += rect;
77  }
78 
79  if (!region.isEmpty()) {
80  m_view->viewport()->update(region);
81  }
82 }
83 
84 QPixmap DelegateAnimator::sequenceFrame(const QModelIndex &index)
85 {
86  foreach (const Animation &animation, m_animations) {
87  if (animation.index == index) {
88  return m_pixmapSequence.frameAt(animation.frame);
89  }
90  }
91  return QPixmap();
92 }
93 
94 ProgressSpinnerDelegate::ProgressSpinnerDelegate(DelegateAnimator *animator, QObject *parent)
95  : QStyledItemDelegate(parent)
96  , m_animator(animator)
97 {
98 
99 }
100 
101 void ProgressSpinnerDelegate::initStyleOption(QStyleOptionViewItem *option, const QModelIndex &index) const
102 {
103  QStyledItemDelegate::initStyleOption(option, index);
104 
105  const QVariant fetchState = index.data(Akonadi::EntityTreeModel::FetchStateRole);
106  if (!fetchState.isValid() || fetchState.toInt() != Akonadi::EntityTreeModel::FetchingState) {
107  m_animator->pop(index);
108  return;
109  }
110 
111  m_animator->push(index);
112 
113  if (QStyleOptionViewItemV4 *v4 = qstyleoption_cast<QStyleOptionViewItemV4 *>(option)) {
114  v4->icon = m_animator->sequenceFrame(index);
115  }
116 }
117 
118 uint Akonadi::qHash(Akonadi::DelegateAnimator::Animation anim)
119 {
120  return qHash(anim.index);
121 }
QModelIndex
QAbstractItemView
Akonadi::EntityTreeModel::FetchStateRole
Returns the FetchState of a particular item.
Definition: entitytreemodel.h:351
QStyledItemDelegate::initStyleOption
virtual void initStyleOption(QStyleOptionViewItem *option, const QModelIndex &index) const
QObject::timerEvent
virtual void timerEvent(QTimerEvent *event)
QTimerEvent
QRect
QVariant::toInt
int toInt(bool *ok) const
QStyleOptionViewItem
QObject
QPixmap
QModelIndex::data
QVariant data(int role) const
QLatin1String
Akonadi::EntityTreeModel::FetchingState
There is a fetch of items in this collection in progress.
Definition: entitytreemodel.h:376
QTimerEvent::timerId
int timerId() const
QRegion::isEmpty
bool isEmpty() const
QVariant::isValid
bool isValid() const
QStyleOptionViewItemV4
QRegion
QVariant
QStyledItemDelegate
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