i needs zoomable image slider with cached network image something like this:
user can zoom on it and back
You can try this plugin from Flutter to create the slider "Carousel Slider"
https://pub.dev/packages/carousel_slider
and Include photos in Photo view widget
PhotoView(
imageProvider: AssetImage(photos),
backgroundDecoration: BoxDecoration(color: Colors.white),
),
Related
Lets say you have a ListView of variable height:
List items are a Container with a mix of text and images. As such, the list items are of variable height. Sometimes no images. The text renders immediately as expected, but the images may take time to retrieve and render on screen
The images are retrieved from the network using CachedNetworkImage
Images are of variable height
When the Screen is opened the ListView automatically scrolls to item#11 (using ensureVisible technique)
So there are items both above and below your current position
At this point, when one of the network images above your position load up, the entire ListView will be pushed and you will no longer be looking at Item #11, rather somewhere randomly higher up
I considered initiating a new scroll in a callback after each image loads, however, due to network speeds, usually the listview scroll will finish before all the images load. If there are a lot of images, the images could take time to load, so it would be unreasonable to initiate a new scroll each time a new image is loaded, the screen just keeps scrolling forward every few seconds. It becomes dizzying and annoying.
Alternatively, the scrollview could jumpTo a new position as soon as the image loads, but I'm imagining there would be a slight delay between the two events and the user perceive a small "glitch" as the image loads and the listview immediately jumps to offset the image load. Even using a Future.microtask there is a very small perceptible 'glitch' as the image loads and the jumpto fires
It would be most preferable to have the listview expand the content upward somehow, so that the users current scroll position is maintained, as far as they are concerned.
Is it possible to have the ListView keep its position as the images load?
Assuming you have a predefined size for your images, you can wrap the image in a SizedBox(). This way your list will always have the same height and your items won't get pushed around.
EDIT:
Since your images are of variable size, I would probably animate to the desired location on every image load.
CachedNetworkImage has a callback
imageBuilder: (context, imageProvider) {
/// Animate to desired index
return Image(image: imageProvider);
}
Animated container, might help you. It can adjust the height automatically, depending on the height u provide in builder.
Also you can use this answer to determnin image height and width in rnutime.
Images are of variable height
To overcome this, Either we take the image size or aspect ratio of the image while storing the image along with other data.
While retrieving data, along with other text data we will receive the aspect ratio or height for the image.
I would use the same height or ratio and show placeholder image till images are loaded.
CachedNetworkImage(
imageUrl: countryList[index].flagUrl,
height: 60, // Set your height according to aspect ratio or fixed height
width: 60,
fit: BoxFit.cover,
placeholder: (_, __) => Container(
alignment: Alignment.center,
height: 60, // Set your height
width: 60,
color: Colors.red.withAlpha(80),
child: Text(
countryList[index].name[0],
style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold),
),
),
)
Image must be of specific aspect ratio I believe. You can define height according to aspect ratio.
Try as follows:
ListView.builder(
shrinkWrap: true,
itemCount: images.length,
itemBuilder: (ctx, i) {
return Column(children: [
ButtonItems(i),
const SizedBox(height: 10),
]);
}));
Button Items class
class ButtonItems extends StatefulWidget {
final int i;
ButtonItems(this.i);
#override
_ButtonItems createState() => _ButtonItems();
}
class _ButtonItems extends State<ButtonItems> {
var images = [
"https://opengraph.githubassets.com/2ddb0ff05ef9ccfce35abb56e30d9c5068e01d1d10995484cfd07becee9accf7/dartpad/dartpad.github.io",
null,
"https://opengraph.githubassets.com/2ddb0ff05ef9ccfce35abb56e30d9c5068e01d1d10995484cfd07becee9accf7/dartpad/dartpad.github.io"
];
#override
Widget build(BuildContext context) {
print(images[widget.i]);
return Container(
height: 50,
color: Colors.grey,
child: Row(children: [
AspectRatio(
aspectRatio: 3 / 2,
child: images[widget.i] == null
? Container()
: Image.network(images[widget.i]!, fit: BoxFit.cover),
),
Text("Title " + widget.i.toString()),
]));
}
}
I used the flutter_colorpicker package to implement a color picker in my app. My widget looks something like this:
ColorPicker(
pickerColor: ...,
paletteType: PaletteType.hueWheel,
onColorChanged: (color) {
...
},
enableAlpha: false,
labelTypes: const [],
)
In the UI it looks like this:
Now I want to remove the brightness bar on the bottom. I know that the color picker is not complete without that brighness bar but I will handle the brightness a different way. I have found no official documentation on how to achieve this.
How do I remove that bar? Hacks are also welcome or somehow extending the package with inheritance.
Here I attach some links which contains no brightnesss bar
Flutter Material Color Picker
Flex Color Picker
I have solved the problem by clipping away that bar using a ClipRect widget:
ClipRect(
child: Align(
alignment: Alignment.topCenter,
heightFactor: 0.75,
child: ColorPicker(
...
colorPickerWidth: 250,
),
),
);
I have not found any unwanted side effects with this approach yet.
So I am using the video_player package in my Flutter project and have made use of VideoProgressIndicator and it works exactly as intended:
Widget progBar(BuildContext context) {
return VideoProgressIndicator(
_controller,
allowScrubbing: true, // user can touch/drag bar to change position of video.
colors: VideoProgressColors(playedColor: Colors.red, bufferedColor: Colors.white),
padding: const EdgeInsets.symmetric(vertical: 6, horizontal: 9),
);
}
The issue:
I have the timestamp(s) of the video as part of the player and when the user uses the VideoProgressIndicator to change the position of the video, I don't have the new position of the video so that I can update the timestamp(s).
My question:
How can I get the new position of the video when the VideoProgressIndicator changes it?
Thank You!
Ok so I figured out my solution to be simply to create a custom progress bar that manipulates a timer.
cv template and I want to edit it with flutter
Everything in Flutter is widgets, this image would be an Image widget in your Flutter app.
You can use Stack widget to put things over each other. so You can put image over an image by using Stack widget.
Unfortunately you can't edit text of an image in Flutter, Instead I would rather to edit this image (for putting image and editing text) by Photoshop for example and then implementing it as one piece widget in my Flutter app.
What I assess from your question is you want to have a layout like the one given in your link, right? For a circular image, you could use CircleAvatar. As for the text you could use the Text widget. Now put these widgets inside a Column or Row. You seem to be new to Flutter and I'd suggest you to get a good grip on the basics first. Anyhow, here's a little dummy code snippet you could extend to achieve what you're looking for
Column(
crossAxisAlignment: CrossAxisAlignment
.start, //if you want your widgets to align on left in your col
children: [
CircleAvatar(
radius: 70,
foregroundImage: AssetImage("pathToYourAssetImg"),
),
SizedBox(
height: 20, //set this to your intended value
),
Text( //you could also create a custom text widget and pass the arguments if you don't want to hardcode text widgets over & over again for all of your text
"yourText",
style: TextStyle(
color: Colors.black87,
fontSize: 20, //set this to your value
fontWeight: FontWeight.bold //if you want to have a bold text
),
),
],
);
I tried to use Image.network() flutter widget to view a thumbnail image from youtube video which was added manually but the image in the widget displays with top and bottom.black screen but not a full one based on the container width and height as below image
What could be a problem?
Stack (
children:[
Container (
child: Image.network (
Url,
fit:BoxFit.cover,
height: 500,
widht: 400
),
Container (
aligment:Alignment.bottonLeft,
child: Text (
Name
)
)
)
]
);
Use fit property.
Image.network(fit:BoxFit.cover, src: 'image path')