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Camera Plugin: Refactored UI code of example app and improved it a little.
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-126
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+117
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‎packages/camera/example/lib/main.dart

Lines changed: 117 additions & 126 deletions
Original file line numberDiff line numberDiff line change
@@ -39,161 +39,152 @@ class _CameraExampleHomeState extends State<CameraExampleHome> {
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@override
4141
Widget build(BuildContext context) {
42-
final List<Widget> controlsChildren = <Widget>[];
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final List<Widget> cameraList = <Widget>[];
44-
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if (cameras.isEmpty) {
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cameraList.add(const Text('No camera found'));
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} else {
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for (CameraDescription cameraDescription in cameras) {
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cameraList.add(
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new SizedBox(
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width: 90.0,
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child: new RadioListTile<CameraDescription>(
53-
title: new Icon(
54-
getCameraLensIcon(cameraDescription.lensDirection)),
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groupValue: controller?.description,
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value: cameraDescription,
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onChanged: (CameraDescription newValue) async =>
58-
onNewCameraSelected(newValue)),
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),
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);
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}
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}
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64-
// Add the cameras to the main controls widget.
65-
controlsChildren.add(new Row(children: cameraList));
66-
67-
if (imagePath != null || videoController != null) {
68-
controlsChildren.add(previewWidget());
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}
70-
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// Initialize the preview window
72-
final List<Widget> previewChildren = <Widget>[];
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// Depending on controller state display a message or the camera preview.
75-
if (controller == null || !controller.value.isInitialized) {
76-
previewChildren.add(const Text(
77-
'Tap a camera',
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style: const TextStyle(
79-
color: Colors.white,
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fontSize: 24.0,
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fontWeight: FontWeight.w900,
82-
),
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));
84-
} else if (controller.value.hasError) {
85-
previewChildren.add(
86-
new Text('Camera error ${controller.value.errorDescription}'),
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);
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} else {
89-
previewChildren.add(
90-
new Container(
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// Handle the preview depending on the aspect ratio of the camera view.
92-
child: new AspectRatio(
93-
aspectRatio: controller.value.aspectRatio,
94-
child: new CameraPreview(controller),
95-
),
96-
height: (MediaQuery.of(context).size.height - 230.0),
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color: Colors.black,
98-
),
99-
);
100-
}
101-
10242
// The main scaffolding of the app.
10343
return new Scaffold(
10444
key: _scaffoldKey,
10545
appBar: new AppBar(
10646
title: const Text('Camera example'),
10747
),
10848
body: new Column(children: <Widget>[
109-
new Container(
110-
child: new Padding(
111-
padding: const EdgeInsets.all(1.0),
112-
child: new Center(
113-
child: new Column(
114-
mainAxisAlignment: MainAxisAlignment.center,
115-
// Add the preview to the app.
116-
children: previewChildren,
49+
new Expanded(
50+
child: new Container(
51+
child: new Padding(
52+
padding: const EdgeInsets.all(1.0),
53+
child: new Center(
54+
child: _cameraPreviewWidget(),
11755
),
11856
),
119-
),
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// Size of the container as wide as the device screen.
121-
width: MediaQuery.of(context).size.width,
122-
decoration: new BoxDecoration(
123-
color: Colors.black,
124-
border: new Border.all(
125-
color: controller != null && controller.value.isRecordingVideo
126-
? Colors.redAccent
127-
: Colors.grey,
128-
width: 3.0,
57+
decoration: new BoxDecoration(
58+
color: Colors.black,
59+
border: new Border.all(
60+
color: controller != null && controller.value.isRecordingVideo
61+
? Colors.redAccent
62+
: Colors.grey,
63+
width: 3.0,
64+
),
12965
),
13066
),
13167
),
13268
new Padding(
13369
padding: const EdgeInsets.all(5.0),
13470
child: new Row(
13571
mainAxisAlignment: MainAxisAlignment.start,
136-
// Add the controls to the app.
137-
children: controlsChildren),
72+
children: <Widget>[
73+
_cameraTogglesRowWidget(),
74+
_thumbnailWidget(),
75+
]),
13876
),
77+
_captureControlRowWidget(),
13978
]),
140-
141-
// Bottom bar with the capture controls.
142-
bottomNavigationBar: (controller == null)
143-
? null
144-
: new Row(
145-
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
146-
mainAxisSize: MainAxisSize.max,
147-
children: <Widget>[
148-
new IconButton(
149-
icon: const Icon(Icons.camera_alt),
150-
color: Colors.blue,
151-
onPressed: controller.value.isInitialized &&
152-
!controller.value.isRecordingVideo
153-
? onTakePictureButtonPressed
154-
: null,
155-
),
156-
new IconButton(
157-
icon: const Icon(Icons.videocam),
158-
color: Colors.blue,
159-
onPressed: controller.value.isInitialized &&
160-
!controller.value.isRecordingVideo
161-
? onVideoRecordButtonPressed
162-
: null,
163-
),
164-
new IconButton(
165-
icon: const Icon(Icons.stop),
166-
color: Colors.red,
167-
onPressed: controller.value.isInitialized &&
168-
controller.value.isRecordingVideo
169-
? onStopButtonPressed
170-
: null,
171-
)
172-
],
173-
),
17479
);
17580
}
17681

82+
/// Display the preview from the camera (or a message if the preview is not available).
83+
Widget _cameraPreviewWidget() {
84+
if (controller == null || !controller.value.isInitialized) {
85+
return const Text(
86+
'Tap a camera',
87+
style: const TextStyle(
88+
color: Colors.white,
89+
fontSize: 24.0,
90+
fontWeight: FontWeight.w900,
91+
),
92+
);
93+
} else if (controller.value.hasError) {
94+
return new Text('Camera error ${controller.value.errorDescription}');
95+
} else {
96+
return new AspectRatio(
97+
aspectRatio: controller.value.aspectRatio,
98+
child: new CameraPreview(controller),
99+
);
100+
}
101+
}
102+
177103
/// Display the thumbnail of the captured image.
178-
Widget previewWidget() {
104+
Widget _thumbnailWidget() {
179105
return new Expanded(
180106
child: new Align(
181107
alignment: Alignment.centerRight,
182-
child: new SizedBox(
183-
child: (videoController == null)
184-
? new Image.file(new File(imagePath))
185-
: new Container(
186-
child: new VideoPlayer(videoController),
187-
decoration: new BoxDecoration(
188-
border: new Border.all(color: Colors.pink)),
189-
),
190-
width: 64.0,
191-
height: 64.0,
192-
),
108+
child: videoController == null && imagePath == null
109+
? null
110+
: new SizedBox(
111+
child: (videoController == null)
112+
? new Image.file(new File(imagePath))
113+
: new Container(
114+
child: new VideoPlayer(videoController),
115+
decoration: new BoxDecoration(
116+
border: new Border.all(color: Colors.pink)),
117+
),
118+
width: 64.0,
119+
height: 64.0,
120+
),
193121
),
194122
);
195123
}
196124

125+
/// Display the control bar with buttons to take pictures and record videos.
126+
Widget _captureControlRowWidget() {
127+
return new Row(
128+
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
129+
mainAxisSize: MainAxisSize.max,
130+
children: <Widget>[
131+
new IconButton(
132+
icon: const Icon(Icons.camera_alt),
133+
color: Colors.blue,
134+
onPressed: controller != null &&
135+
controller.value.isInitialized &&
136+
!controller.value.isRecordingVideo
137+
? onTakePictureButtonPressed
138+
: null,
139+
),
140+
new IconButton(
141+
icon: const Icon(Icons.videocam),
142+
color: Colors.blue,
143+
onPressed: controller != null &&
144+
controller.value.isInitialized &&
145+
!controller.value.isRecordingVideo
146+
? onVideoRecordButtonPressed
147+
: null,
148+
),
149+
new IconButton(
150+
icon: const Icon(Icons.stop),
151+
color: Colors.red,
152+
onPressed: controller != null &&
153+
controller.value.isInitialized &&
154+
controller.value.isRecordingVideo
155+
? onStopButtonPressed
156+
: null,
157+
)
158+
],
159+
);
160+
}
161+
162+
/// Display a row of toggle to select the camera (or a message if no camera is available).
163+
Widget _cameraTogglesRowWidget() {
164+
final List<Widget> toggles = <Widget>[];
165+
166+
if (cameras.isEmpty) {
167+
return const Text('No camera found');
168+
} else {
169+
for (CameraDescription cameraDescription in cameras) {
170+
toggles.add(
171+
new SizedBox(
172+
width: 90.0,
173+
child: new RadioListTile<CameraDescription>(
174+
title: new Icon(
175+
getCameraLensIcon(cameraDescription.lensDirection)),
176+
groupValue: controller?.description,
177+
value: cameraDescription,
178+
onChanged: (CameraDescription newValue) async =>
179+
onNewCameraSelected(newValue)),
180+
),
181+
);
182+
}
183+
}
184+
185+
return new Row(children: toggles);
186+
}
187+
197188
String timestamp() => new DateTime.now().millisecondsSinceEpoch.toString();
198189

199190
void showInSnackBar(String message) {

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