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
|
/***************************************************************************
* Copyright (C) 2008 by Simon St James <[email protected]> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, 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 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 "folderexpander.h"
#include <QtCore/QTimer>
#include <QtGui/QAbstractItemView>
#include <QtGui/QTreeView>
#include <QtGui/QScrollBar>
#include <QtCore/QEvent>
#include <QtGui/QDragMoveEvent>
#include <QtGui/QSortFilterProxyModel>
#include <kdirmodel.h>
FolderExpander::FolderExpander(QAbstractItemView *view, QSortFilterProxyModel *proxyModel) :
QObject(view),
m_enabled(true),
m_view(view),
m_proxyModel(proxyModel),
m_autoExpandTriggerTimer(0),
m_autoExpandPos()
{
if (m_view == 0) {
return;
}
if (m_proxyModel == 0) {
return;
}
KDirModel *m_dirModel = qobject_cast<KDirModel*>(m_proxyModel->sourceModel());
if (m_dirModel == 0) {
return;
}
// Initialise auto-expand timer.
m_autoExpandTriggerTimer = new QTimer(this);
m_autoExpandTriggerTimer->setSingleShot(true);
connect(m_autoExpandTriggerTimer, SIGNAL(timeout()),
this, SLOT(autoExpandTimeout()));
// The view scrolling complicates matters, so we want to
// be informed if they occur.
connect(m_view->horizontalScrollBar(), SIGNAL(valueChanged(int)),
this, SLOT(viewScrolled()));
connect(m_view->verticalScrollBar(), SIGNAL(valueChanged(int)),
this, SLOT(viewScrolled()));
// "Dragging" events are sent to the QAbstractItemView's viewport.
m_view->viewport()->installEventFilter(this);
}
void FolderExpander::setEnabled(bool enabled)
{
m_enabled = enabled;
}
bool FolderExpander::enabled() const
{
return m_enabled;
}
FolderExpander::~FolderExpander()
{
}
void FolderExpander::viewScrolled()
{
if (m_autoExpandTriggerTimer->isActive()) {
m_autoExpandTriggerTimer->start(AUTO_EXPAND_DELAY);
}
}
void FolderExpander::autoExpandTimeout()
{
if (!m_enabled) {
return;
}
// We want to find whether the file currently being hovered over is a
// directory. TODO - is there a simpler way, preferably without
// needing to pass in m_proxyModel that has a KDirModel as its sourceModel() ... ?
QModelIndex proxyIndexToExpand = m_view->indexAt(m_autoExpandPos);
QModelIndex indexToExpand = m_proxyModel->mapToSource(proxyIndexToExpand);
KDirModel* m_dirModel = qobject_cast< KDirModel* >(m_proxyModel->sourceModel());
Q_ASSERT(m_dirModel != 0);
KFileItem itemToExpand = m_dirModel->itemForIndex(indexToExpand);
if (itemToExpand.isNull() || itemToExpand == m_dirModel->itemForIndex(QModelIndex())) {
// The second clause occurs when we are expanding the folder represented
// by the view, which is a case we should ignore (#182618).
return;
}
if (itemToExpand.isDir()) {
QTreeView* treeView = qobject_cast<QTreeView*>(m_view);
if ((treeView != 0) && treeView->itemsExpandable()) {
// Toggle expanded state of this directory.
treeView->setExpanded(proxyIndexToExpand, !treeView->isExpanded(proxyIndexToExpand));
}
else {
emit enterDir(proxyIndexToExpand);
}
}
}
bool FolderExpander::eventFilter(QObject* watched, QEvent* event)
{
Q_UNUSED(watched);
// We're interested in reading Drag* events, but not filtering them,
// so always return false.
// We just store the position of the hover, here; actually working out
// what the hovered item is and whether it is expandable is done in
// autoExpandTimeout.
if (event->type() == QEvent::DragMove) {
QDragMoveEvent *dragMoveEvent = static_cast<QDragMoveEvent*>(event);
// (Re-)set the timer while we're still moving and dragging.
m_autoExpandTriggerTimer->start(AUTO_EXPAND_DELAY);
m_autoExpandPos = dragMoveEvent->pos();
} else if (event->type() == QEvent::DragLeave || event->type() == QEvent::Drop) {
m_autoExpandTriggerTimer->stop();
}
return false;
}
|
