1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include <qmath.h>
#include <QGraphicsLinearLayout>
#include <QGraphicsScene>
#include "listitemcontainer.h"
#include "abstractviewitem.h"
#include "recycledlistitem.h"
#include "listitemcache.h"
#include "itemrecyclinglist.h"
ListItemContainer::ListItemContainer(int bufferSize, ItemRecyclingList *view, QGraphicsWidget *parent)
: AbstractItemContainer(bufferSize, parent)
, m_view(view)
, m_layout(new QGraphicsLinearLayout(Qt::Vertical))
, m_listItemCaching(false)
{
setContentsMargins(0,0,0,0);
m_layout->setContentsMargins(0,0,0,0);
m_layout->setSpacing(0);
setLayout(m_layout);
}
/*virtual*/
ListItemContainer::~ListItemContainer()
{
setListItemCaching(false);
for (int i = 0; i < m_items.count(); ++i) {
m_layout->removeItem(m_items.at(i));
m_items.at(i)->setParentItem(0);
}
qDeleteAll(m_items);
m_items.clear();
}
bool ListItemContainer::listItemCaching() const
{
return m_listItemCaching;
}
void ListItemContainer::setListItemCaching(const bool enabled)
{
if (m_listItemCaching == enabled)
return;
m_listItemCaching = enabled;
const int itemCount = m_layout->count();
for (int i = 0; i < itemCount; ++i)
setListItemCaching(enabled, i);
}
/*virtual*/
void ListItemContainer::adjustVisibleContainerSize(const QSizeF &size)
{
m_layout->setPreferredWidth(size.width());
}
/*virtual*/
void ListItemContainer::addItemToVisibleLayout(int index, AbstractViewItem *item)
{
m_layout->insertItem(index,item);
setListItemCaching(m_listItemCaching, index);
}
/*virtual*/
void ListItemContainer::removeItemFromVisibleLayout(AbstractViewItem *item)
{
m_layout->removeItem(item);
RecycledListItem *recycledItem = static_cast<RecycledListItem*>(item);
if (!recycledItem)
return;
ListItem *listItem = recycledItem->item();
setListItemCaching(false, listItem);
}
/*virtual*/
int ListItemContainer::maxItemCountInItemBuffer() const
{
int count = AbstractItemContainer::maxItemCountInItemBuffer();
if (count > 0) {
int currentItemCount = m_items.count();
qreal heightOfOneItem = 0;
if (currentItemCount > 0)
{
heightOfOneItem = m_layout->effectiveSizeHint(Qt::PreferredSize).height() / currentItemCount;
}
int guess = 0;
if( heightOfOneItem <= 0 ) {
if (m_prototype) {
heightOfOneItem = m_prototype->effectiveSizeHint(Qt::PreferredSize).height();
}
else
heightOfOneItem = 50; // TODO magic number, do we have better guess if prototype is not set?
}
if (heightOfOneItem > 0) {
guess = qCeil(m_itemView->boundingRect().height() / heightOfOneItem) + m_bufferSize;
if (guess < currentItemCount) {
if( guess > currentItemCount-2) { // TODO magic number here, Can we use buffer size?
guess = currentItemCount;
}
}
}
count = qMin(guess, count);
}
return count;
}
void ListItemContainer::setListItemCaching(const bool enabled, const int index)
{
RecycledListItem *recycledItem = static_cast<RecycledListItem*>(m_layout->itemAt(index));
if (!recycledItem)
return;
ListItem *listItem = recycledItem->item();
if (!listItem)
return;
setListItemCaching(enabled, listItem);
}
void ListItemContainer::setListItemCaching(const bool enabled, ListItem *listItem)
{
if (!listItem)
return;
// Deletes the effect.
listItem->setGraphicsEffect(0);
if (enabled) {
ListItemCache* cache = new ListItemCache;
Q_ASSERT(!listItem->graphicsEffect());
listItem->setGraphicsEffect(cache);
}
}
void ListItemContainer::setTwoColumns(const bool twoColumns)
{
AbstractItemContainer::setTwoColumns(twoColumns);
if (!m_layout->isActivated())
m_layout->activate();
}
|
