• Skip to content
  • Skip to link menu
  • KDE API Reference
  • kdelibs-4.14.38 API Reference
  • KDE Home
  • Contact Us
 

Plasma

  • plasma
  • animations
pixmaptransition.cpp
Go to the documentation of this file.
1/*
2 * Copyright 2009 Mehmet Ali Akmanalp <makmanalp@wpi.edu>
3 * Copyright 2010 Marco Martin <notmart@gmail.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Library General Public License as
7 * published by the Free Software Foundation; either version 2, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details
14 *
15 * You should have received a copy of the GNU Library General Public
16 * License along with this program; if not, write to the
17 * Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19 */
20
21#include "pixmaptransition_p.h"
22
23#include <QPainter>
24#include <QPixmap>
25
26#include <kdebug.h>
27
28#include "paintutils.h"
29
30namespace Plasma
31{
32
33PixmapTransition::PixmapTransition(QObject *parent)
34 : EasingAnimation(parent),
35 m_cache(false),
36 m_dirty(false)
37{
38}
39
40PixmapTransition::~PixmapTransition()
41{
42}
43
44void PixmapTransition::setStartPixmap(const QPixmap &pixmap)
45{
46 if (state() == Running) {
47 stop();
48 }
49
50 m_startPixmap = pixmap;
51
52 //this will center the pixmaps if needed
53 updateEffectiveTime(0);
54}
55
56QPixmap PixmapTransition::startPixmap() const
57{
58 return m_startPixmap;
59}
60
61void PixmapTransition::setTargetPixmap(const QPixmap &pixmap)
62{
63 if (state() == Running) {
64 stop();
65 }
66
67 m_targetPixmap = pixmap;
68
69 updateEffectiveTime(0);
70}
71
72void PixmapTransition::setUsesCache(bool cache)
73{
74 m_cache = cache;
75}
76
77bool PixmapTransition::usesCache() const
78{
79 return m_cache;
80}
81
82QPixmap PixmapTransition::targetPixmap() const
83{
84 return m_targetPixmap;
85}
86
87QPixmap PixmapTransition::currentPixmap() const
88{
89 if (m_cache && !m_dirty) {
90 return m_currentPixmap;
91 }
92
93 QPixmap currentPixmap;
94 qreal delta = currentTime() / qreal(duration());
95 if (!m_startPixmap.isNull() && !m_targetPixmap.isNull()) {
96 //kDebug() << "transitioning";
97 currentPixmap = Plasma::PaintUtils::transition(m_startPixmap, m_targetPixmap, delta);
98 } else if (m_startPixmap.isNull()) {
99 if (qFuzzyCompare(delta, qreal(1.0))) {
100 currentPixmap = alignedTargetPixmap();
101 return currentPixmap;
102 }
103
104 if (currentPixmap.isNull()) {
105 currentPixmap = QPixmap(m_pixmapSize);
106 }
107
108 currentPixmap.fill(QColor(0, 0, 0, (int)(((qreal)255)*delta)));
109 QPainter p(&currentPixmap);
110 p.setCompositionMode(QPainter::CompositionMode_SourceIn);
111 //kDebug() << "painting" << m_targetPixmap.rect() << "into" << m_targetRect << "in size" << currentPixmap.size();
112 p.drawPixmap(m_targetRect, m_targetPixmap);
113 p.end();
114 } else if (m_targetPixmap.isNull()) {
115 currentPixmap = alignedStartPixmap();
116 if (qFuzzyCompare(delta, qreal(1.0))) {
117 return m_currentPixmap;
118 }
119 //kDebug() << "painting" << m_startPixmap.rect() << "into" << m_targetRect << "in size" << currentPixmap.size();
120 QPainter p(&currentPixmap);
121 p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
122 p.fillRect(currentPixmap.rect(), QColor(0, 0, 0, (int)(254 - ((qreal)254)*delta)));
123 p.end();
124 }
125
126 if (m_cache) {
127 const_cast<PixmapTransition *>(this)->m_currentPixmap = currentPixmap;
128 }
129
130 return currentPixmap;
131}
132
133QPixmap PixmapTransition::alignedTargetPixmap() const
134{
135 QPixmap pm(m_pixmapSize);
136 pm.fill(Qt::transparent);
137 QPainter p(&pm);
138 p.drawPixmap(m_targetRect, m_targetPixmap);
139 return pm;
140}
141
142QPixmap PixmapTransition::alignedStartPixmap() const
143{
144 QPixmap pm(m_pixmapSize);
145 pm.fill(Qt::transparent);
146 QPainter p(&pm);
147 p.drawPixmap(m_startRect, m_startPixmap);
148 return pm;
149}
150
151void PixmapTransition::updateState(QAbstractAnimation::State newState, QAbstractAnimation::State oldState)
152{
153 if (oldState == Stopped && newState == Running) {
154 m_targetRect = m_targetPixmap.rect();
155 m_startRect = m_startPixmap.rect();
156 m_pixmapSize = m_startRect.size().expandedTo(m_targetRect.size());
157 QRect actualRect = QRect(QPoint(0,0), m_pixmapSize);
158 m_targetRect.moveCenter(actualRect.center());
159 m_startRect.moveCenter(actualRect.center());
160 } else if (QGraphicsWidget *w = targetWidget()) {
161 w->update();
162 }
163
164 m_dirty = true;
165}
166
167void PixmapTransition::updateEffectiveTime(int currentTime)
168{
169 Q_UNUSED(currentTime)
170
171 m_dirty = true;
172 QGraphicsWidget *w = targetWidget();
173 if (w) {
174 w->update();
175 }
176}
177
178} //namespace Plasma
179
180#include "pixmaptransition_p.moc"
QGraphicsWidget
QObject
Plasma::PaintUtils::transition
QPixmap transition(const QPixmap &from, const QPixmap &to, qreal amount)
Blends a pixmap into another.
Definition: paintutils.cpp:208
Plasma
Namespace for everything in libplasma.
Definition: abstractdialogmanager.cpp:25
paintutils.h
This file is part of the KDE documentation.
Documentation copyright © 1996-2023 The KDE developers.
Generated on Mon Feb 20 2023 00:00:00 by doxygen 1.9.6 written by Dimitri van Heesch, © 1997-2006

KDE's Doxygen guidelines are available online.

Plasma

Skip menu "Plasma"
  • Main Page
  • Namespace List
  • Namespace Members
  • Alphabetical List
  • Class List
  • Class Hierarchy
  • Class Members
  • File List
  • File Members
  • Related Pages

kdelibs-4.14.38 API Reference

Skip menu "kdelibs-4.14.38 API Reference"
  • DNSSD
  • Interfaces
  •   KHexEdit
  •   KMediaPlayer
  •   KSpeech
  •   KTextEditor
  • kconf_update
  • KDE3Support
  •   KUnitTest
  • KDECore
  • KDED
  • KDEsu
  • KDEUI
  • KDEWebKit
  • KDocTools
  • KFile
  • KHTML
  • KImgIO
  • KInit
  • kio
  • KIOSlave
  • KJS
  •   KJS-API
  •   WTF
  • kjsembed
  • KNewStuff
  • KParts
  • KPty
  • Kross
  • KUnitConversion
  • KUtils
  • Nepomuk
  • Plasma
  • Solid
  • Sonnet
  • ThreadWeaver
Report problems with this website to our bug tracking system.
Contact the specific authors with questions and comments about the page contents.

KDE® and the K Desktop Environment® logo are registered trademarks of KDE e.V. | Legal