git.iko.soy/unity8
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unity8/plugins/Unity/Indicators/unitymenumodelstack.cpp
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1/*
2 * Copyright 2013 Canonical Ltd.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License as published by
6 * the Free Software Foundation; version 3.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU Lesser General Public License for more details.
12 *
13 * You should have received a copy of the GNU Lesser General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 *
16 * Authors:
17 * Nick Dedekind <nick.dedekind@canonical.com>
18 */
20#include "unitymenumodelstack.h"
22#include <QDebug>
23#include <unitymenumodel.h>
25class UnityMenuModelEntry : public QObject {
26 Q_OBJECT
27public:
28 UnityMenuModelEntry(UnityMenuModel* model, UnityMenuModel* parentModel, int index)
29 : m_model(model),
30 m_parentModel(parentModel),
31 m_index(index)
32 {
33 if (m_parentModel) {
34 QObject::connect(m_parentModel, &UnityMenuModel::rowsInserted, this, &UnityMenuModelEntry::onRowsInserted);
35 QObject::connect(m_parentModel, &UnityMenuModel::rowsRemoved, this, &UnityMenuModelEntry::onRowsRemoved);
36 QObject::connect(m_parentModel, &UnityMenuModel::modelReset, this, &UnityMenuModelEntry::onModelReset);
37 }
38 }
40 UnityMenuModel* model() const { return m_model; }
42private Q_SLOTS:
43 void onRowsInserted(const QModelIndex&, int start, int end)
44 {
45 int delta = end-start + 1;
46 if (start <= m_index) {
47 m_index += delta;
48 }
49 }
51 void onRowsRemoved(const QModelIndex&, int start, int end)
52 {
53 int delta = end-start + 1;
54 if (start <= m_index) {
55 if (start + delta > m_index) {
56 // in the range removed
57 Q_EMIT remove();
58 disconnect(m_parentModel, 0, this, 0);
59 } else {
60 m_index -= delta;
61 }
62 }
63 }
65 void onModelReset()
66 {
67 Q_EMIT remove();
68 disconnect(m_parentModel, 0, this, 0);
69 }
71Q_SIGNALS:
72 void remove();
74private:
75 UnityMenuModel* m_model;
76 UnityMenuModel* m_parentModel;
77 int m_index;
78};
80UnityMenuModelStack::UnityMenuModelStack(QObject* parent)
81 : QObject(parent)
85UnityMenuModelStack::~UnityMenuModelStack()
87 qDeleteAll(m_menuModels);
88 m_menuModels.clear();
91UnityMenuModel* UnityMenuModelStack::head() const
93 return !m_menuModels.isEmpty() ? m_menuModels.first()->model() : nullptr;
96void UnityMenuModelStack::setHead(UnityMenuModel* model)
98 if (head() != model) {
99 qDeleteAll(m_menuModels);
100 m_menuModels.clear();
102 push(model, 0);
103 Q_EMIT headChanged(model);
104 }
107UnityMenuModel* UnityMenuModelStack::tail() const
109 return !m_menuModels.isEmpty() ? m_menuModels.last()->model() : nullptr;
112int UnityMenuModelStack::count() const
114 return m_menuModels.count();
117void UnityMenuModelStack::push(UnityMenuModel* model, int index)
119 UnityMenuModelEntry* entry = new UnityMenuModelEntry(model, tail(), index);
120 QObject::connect(entry, &UnityMenuModelEntry::remove, this, &UnityMenuModelStack::onRemove);
122 m_menuModels << entry;
123 Q_EMIT tailChanged(model);
124 Q_EMIT countChanged(m_menuModels.count());
127UnityMenuModel* UnityMenuModelStack::pop()
129 if (m_menuModels.isEmpty()) {
130 return nullptr;
131 }
132 UnityMenuModelEntry* entry = m_menuModels.takeLast();
133 UnityMenuModel* model = entry->model();
134 entry->deleteLater();
136 Q_EMIT tailChanged(tail());
137 if (m_menuModels.isEmpty()) {
138 Q_EMIT headChanged(nullptr);
139 }
140 Q_EMIT countChanged(m_menuModels.count());
142 return model;
145void UnityMenuModelStack::onRemove()
147 UnityMenuModelEntry* removed = qobject_cast<UnityMenuModelEntry*>(sender());
148 if (!m_menuModels.contains(removed))
149 return;
151 for (int i = m_menuModels.count() -1; i >= 0; i--) {
152 UnityMenuModelEntry* entry = m_menuModels[i];
153 pop();
154 if (entry == removed) {
155 break;
156 }
157 }
160#include "unitymenumodelstack.moc"