source: trunk/doc/src/snippets/qlistview-dnd/model.cpp@ 846

Last change on this file since 846 was 846, checked in by Dmitry A. Kuminov, 14 years ago

trunk: Merged in qt 4.7.2 sources from branches/vendor/nokia/qt.

File size: 4.8 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
4** All rights reserved.
5** Contact: Nokia Corporation ([email protected])
6**
7** This file is part of the documentation of the Qt Toolkit.
8**
9** $QT_BEGIN_LICENSE:BSD$
10** You may use this file under the terms of the BSD license as follows:
11**
12** "Redistribution and use in source and binary forms, with or without
13** modification, are permitted provided that the following conditions are
14** met:
15** * Redistributions of source code must retain the above copyright
16** notice, this list of conditions and the following disclaimer.
17** * Redistributions in binary form must reproduce the above copyright
18** notice, this list of conditions and the following disclaimer in
19** the documentation and/or other materials provided with the
20** distribution.
21** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
22** the names of its contributors may be used to endorse or promote
23** products derived from this software without specific prior written
24** permission.
25**
26** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
27** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
28** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
29** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
30** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
31** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
32** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
33** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
34** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
35** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
36** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
37** $QT_END_LICENSE$
38**
39****************************************************************************/
40
41/****************************************************************************
42**
43** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
44** All rights reserved.
45** Contact: Nokia Corporation ([email protected])
46**
47** This file is part of an example program for Qt.
48** EDITIONS: NOLIMITS
49**
50****************************************************************************/
51
52/*
53 model.cpp
54
55 A simple model that uses a QStringList as its data source.
56*/
57
58#include <QtGui>
59
60#include "model.h"
61
62DragDropListModel::DragDropListModel(const QStringList &strings,
63 QObject *parent)
64 : QStringListModel(strings, parent)
65{
66}
67
68//! [0]
69bool DragDropListModel::dropMimeData(const QMimeData *data,
70 Qt::DropAction action, int row, int column, const QModelIndex &parent)
71{
72 if (action == Qt::IgnoreAction)
73 return true;
74
75 if (!data->hasFormat("application/vnd.text.list"))
76 return false;
77
78 if (column > 0)
79//! [0] //! [1]
80 return false;
81//! [1]
82
83//! [2]
84 int beginRow;
85
86 if (row != -1)
87 beginRow = row;
88//! [2] //! [3]
89 else if (parent.isValid())
90 beginRow = parent.row();
91//! [3] //! [4]
92 else
93 beginRow = rowCount(QModelIndex());
94//! [4]
95
96//! [5]
97 QByteArray encodedData = data->data("application/vnd.text.list");
98 QDataStream stream(&encodedData, QIODevice::ReadOnly);
99 QStringList newItems;
100 int rows = 0;
101
102 while (!stream.atEnd()) {
103 QString text;
104 stream >> text;
105 newItems << text;
106 ++rows;
107 }
108//! [5]
109
110//! [6]
111 insertRows(beginRow, rows, QModelIndex());
112 foreach (const QString &text, newItems) {
113 QModelIndex idx = index(beginRow, 0, QModelIndex());
114 setData(idx, text);
115 beginRow++;
116 }
117
118 return true;
119}
120//! [6]
121
122//! [7]
123Qt::ItemFlags DragDropListModel::flags(const QModelIndex &index) const
124{
125 Qt::ItemFlags defaultFlags = QStringListModel::flags(index);
126
127 if (index.isValid())
128 return Qt::ItemIsDragEnabled | Qt::ItemIsDropEnabled | defaultFlags;
129 else
130 return Qt::ItemIsDropEnabled | defaultFlags;
131}
132//! [7]
133
134//! [8]
135QMimeData *DragDropListModel::mimeData(const QModelIndexList &indexes) const
136{
137 QMimeData *mimeData = new QMimeData();
138 QByteArray encodedData;
139
140 QDataStream stream(&encodedData, QIODevice::WriteOnly);
141
142 foreach (const QModelIndex &index, indexes) {
143 if (index.isValid()) {
144 QString text = data(index, Qt::DisplayRole).toString();
145 stream << text;
146 }
147 }
148
149 mimeData->setData("application/vnd.text.list", encodedData);
150 return mimeData;
151}
152//! [8]
153
154//! [9]
155QStringList DragDropListModel::mimeTypes() const
156{
157 QStringList types;
158 types << "application/vnd.text.list";
159 return types;
160}
161//! [9]
162
163//! [10]
164Qt::DropActions DragDropListModel::supportedDropActions() const
165{
166 return Qt::CopyAction | Qt::MoveAction;
167}
168//! [10]
Note: See TracBrowser for help on using the repository browser.