source: trunk/examples/layouts/borderlayout/borderlayout.cpp@ 117

Last change on this file since 117 was 2, checked in by Dmitry A. Kuminov, 16 years ago

Initially imported qt-all-opensource-src-4.5.1 from Trolltech.

File size: 6.5 KB
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1/****************************************************************************
2**
3** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4** Contact: Qt Software Information ([email protected])
5**
6** This file is part of the examples of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial Usage
10** Licensees holding valid Qt Commercial licenses may use this file in
11** accordance with the Qt Commercial License Agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and Nokia.
14**
15** GNU Lesser General Public License Usage
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17** General Public License version 2.1 as published by the Free Software
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19** packaging of this file. Please review the following information to
20** ensure the GNU Lesser General Public License version 2.1 requirements
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23** In addition, as a special exception, Nokia gives you certain
24** additional rights. These rights are described in the Nokia Qt LGPL
25** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
26** package.
27**
28** GNU General Public License Usage
29** Alternatively, this file may be used under the terms of the GNU
30** General Public License version 3.0 as published by the Free Software
31** Foundation and appearing in the file LICENSE.GPL included in the
32** packaging of this file. Please review the following information to
33** ensure the GNU General Public License version 3.0 requirements will be
34** met: http://www.gnu.org/copyleft/gpl.html.
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36** If you are unsure which license is appropriate for your use, please
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40****************************************************************************/
41
42#include <QtGui>
43
44#include "borderlayout.h"
45
46BorderLayout::BorderLayout(QWidget *parent, int margin, int spacing)
47 : QLayout(parent)
48{
49 setMargin(margin);
50 setSpacing(spacing);
51}
52
53BorderLayout::BorderLayout(int spacing)
54{
55 setSpacing(spacing);
56}
57
58
59BorderLayout::~BorderLayout()
60{
61 QLayoutItem *l;
62 while ((l = takeAt(0)))
63 delete l;
64}
65
66void BorderLayout::addItem(QLayoutItem *item)
67{
68 add(item, West);
69}
70
71void BorderLayout::addWidget(QWidget *widget, Position position)
72{
73 add(new QWidgetItem(widget), position);
74}
75
76Qt::Orientations BorderLayout::expandingDirections() const
77{
78 return Qt::Horizontal | Qt::Vertical;
79}
80
81bool BorderLayout::hasHeightForWidth() const
82{
83 return false;
84}
85
86int BorderLayout::count() const
87{
88 return list.size();
89}
90
91QLayoutItem *BorderLayout::itemAt(int index) const
92{
93 ItemWrapper *wrapper = list.value(index);
94 if (wrapper)
95 return wrapper->item;
96 else
97 return 0;
98}
99
100QSize BorderLayout::minimumSize() const
101{
102 return calculateSize(MinimumSize);
103}
104
105void BorderLayout::setGeometry(const QRect &rect)
106{
107 ItemWrapper *center = 0;
108 int eastWidth = 0;
109 int westWidth = 0;
110 int northHeight = 0;
111 int southHeight = 0;
112 int centerHeight = 0;
113 int i;
114
115 QLayout::setGeometry(rect);
116
117 for (i = 0; i < list.size(); ++i) {
118 ItemWrapper *wrapper = list.at(i);
119 QLayoutItem *item = wrapper->item;
120 Position position = wrapper->position;
121
122 if (position == North) {
123 item->setGeometry(QRect(rect.x(), northHeight, rect.width(),
124 item->sizeHint().height()));
125
126 northHeight += item->geometry().height() + spacing();
127 } else if (position == South) {
128 item->setGeometry(QRect(item->geometry().x(),
129 item->geometry().y(), rect.width(),
130 item->sizeHint().height()));
131
132 southHeight += item->geometry().height() + spacing();
133
134 item->setGeometry(QRect(rect.x(),
135 rect.y() + rect.height() - southHeight + spacing(),
136 item->geometry().width(),
137 item->geometry().height()));
138 } else if (position == Center) {
139 center = wrapper;
140 }
141 }
142
143 centerHeight = rect.height() - northHeight - southHeight;
144
145 for (i = 0; i < list.size(); ++i) {
146 ItemWrapper *wrapper = list.at(i);
147 QLayoutItem *item = wrapper->item;
148 Position position = wrapper->position;
149
150 if (position == West) {
151 item->setGeometry(QRect(rect.x() + westWidth, northHeight,
152 item->sizeHint().width(), centerHeight));
153
154 westWidth += item->geometry().width() + spacing();
155 } else if (position == East) {
156 item->setGeometry(QRect(item->geometry().x(), item->geometry().y(),
157 item->sizeHint().width(), centerHeight));
158
159 eastWidth += item->geometry().width() + spacing();
160
161 item->setGeometry(QRect(
162 rect.x() + rect.width() - eastWidth + spacing(),
163 northHeight, item->geometry().width(),
164 item->geometry().height()));
165 }
166 }
167
168 if (center)
169 center->item->setGeometry(QRect(westWidth, northHeight,
170 rect.width() - eastWidth - westWidth,
171 centerHeight));
172}
173
174QSize BorderLayout::sizeHint() const
175{
176 return calculateSize(SizeHint);
177}
178
179QLayoutItem *BorderLayout::takeAt(int index)
180{
181 if (index >= 0 && index < list.size()) {
182 ItemWrapper *layoutStruct = list.takeAt(index);
183 return layoutStruct->item;
184 }
185 return 0;
186}
187
188void BorderLayout::add(QLayoutItem *item, Position position)
189{
190 list.append(new ItemWrapper(item, position));
191}
192
193QSize BorderLayout::calculateSize(SizeType sizeType) const
194{
195 QSize totalSize;
196
197 for (int i = 0; i < list.size(); ++i) {
198 ItemWrapper *wrapper = list.at(i);
199 Position position = wrapper->position;
200 QSize itemSize;
201
202 if (sizeType == MinimumSize)
203 itemSize = wrapper->item->minimumSize();
204 else // (sizeType == SizeHint)
205 itemSize = wrapper->item->sizeHint();
206
207 if (position == North || position == South || position == Center)
208 totalSize.rheight() += itemSize.height();
209
210 if (position == West || position == East || position == Center)
211 totalSize.rwidth() += itemSize.width();
212 }
213 return totalSize;
214}
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