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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/*
* Copyright (C) 2013 Canonical, Ltd.
*
* 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; version 3.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
import QtQuick 2.0
// FIXME: When a module contains QML, C++ and JavaScript elements exported,
// we need to use named imports otherwise namespace collision is reported
// by the QML engine. As workaround, we use Ubuntu named import.
// Bug to watch: https://bugreports.qt-project.org/browse/QTBUG-27645
import Ubuntu.Components 1.0 as Ubuntu
/*
Documentation is in CrossFadeImage.qdoc
*/
Item {
id: crossFadeImage
property url source
property int fillMode : Image.PreserveAspectFit
property int fadeDuration: Ubuntu.UbuntuAnimation.FastDuration
// FIXME: Support resetting sourceSize
property size sourceSize: internals.loadingImage ? Qt.size(internals.loadingImage.sourceSize.width, internals.loadingImage.sourceSize.height) : Qt.size(0, 0)
readonly property bool running: nextImageFadeIn.running
readonly property int status: internals.loadingImage ? internals.loadingImage.status : Image.Null
Binding {
target: crossFadeImage
property: "sourceSize"
value: internals.loadingImage ? Qt.size(internals.loadingImage.sourceSize.width, internals.loadingImage.sourceSize.height) : Qt.size(0, 0)
when: internals.forcedSourceSize === undefined
}
/*!
\internal
*/
onSourceSizeChanged: {
if (internals.loadingImage && (sourceSize != Qt.size(internals.loadingImage.sourceSize.width, internals.loadingImage.sourceSize.height))) {
internals.forcedSourceSize = sourceSize;
}
}
QtObject {
id: internals
/*! \internal
Source size specified by the setting crossFadeImage.sourceSize.
*/
property size forcedSourceSize
/*! \internal
Defines the image currently being shown
*/
property Image currentImage: image1
/*! \internal
Defines the image being changed to
*/
property Image nextImage: image2
property Image loadingImage: currentImage
function swapImages() {
internals.currentImage.z = 0;
internals.nextImage.z = 1;
nextImageFadeIn.start();
var tmpImage = internals.currentImage;
internals.currentImage = internals.nextImage;
internals.nextImage = tmpImage;
}
}
Image {
id: image1
anchors.fill: parent
cache: false
asynchronous: true
fillMode: parent.fillMode
z: 1
Binding {
target: image1
property: "sourceSize"
value: internals.forcedSourceSize
when: internals.forcedSourceSize !== undefined
}
}
Image {
id: image2
anchors.fill: parent
cache: false
asynchronous: true
fillMode: parent.fillMode
z: 0
Binding {
target: image2
property: "sourceSize"
value: internals.forcedSourceSize
when: internals.forcedSourceSize !== undefined
}
}
/*!
\internal
Do the fading when the source is updated
*/
onSourceChanged: {
// On creation, the souce handler is called before image pointers are set.
if (internals.currentImage === null) {
internals.currentImage = image1;
internals.nextImage = image2;
}
nextImageFadeIn.stop();
// Don't fade in initial picture, only fade changes
if (internals.currentImage.source == "") {
internals.currentImage.source = source;
internals.loadingImage = internals.currentImage;
} else {
nextImageFadeIn.stop();
internals.nextImage.opacity = 0.0;
internals.nextImage.source = source;
internals.loadingImage = internals.nextImage;
// If case the image is still in QML's cache, status will be "Ready" immediately
if (internals.nextImage.status === Image.Ready || internals.nextImage.source === "") {
internals.swapImages();
}
}
}
Connections {
target: internals.nextImage
onStatusChanged: {
if (internals.nextImage.status == Image.Ready) {
internals.swapImages();
}
}
}
Ubuntu.UbuntuNumberAnimation {
id: nextImageFadeIn
target: internals.nextImage
property: "opacity"
to: 1.0
duration: crossFadeImage.fadeDuration
onRunningChanged: {
if (!running) {
internals.nextImage.source = "";
}
}
}
}
|