how to make the picture zoomable when the photo is clicked, here's the code I made to display the image
Column(
children: [
image11 != null
? Image.file(
image11,
width: 50,
height: 50,
fit: BoxFit.cover,
)
: Text(" Bagian Belakang"),
Container(
margin: const EdgeInsets.fromLTRB(14, 5, 0, 0),
child: RaisedButton(
padding: EdgeInsets.all(10),
onPressed: () {
pickImage11(ImageSource.camera);
},
child: Icon(Icons.camera),
),
),
],
),
Taking inspiration from this answer Hero animation with an AlertDialog
You can use a Hero widget combined with a PageRouteBuilder to imitate a zoom feature:
Navigator.of(context).push(
PageRouteBuilder(
opaque: false,
barrierDismissible:true,
pageBuilder: (BuildContext context, _, __) {
return Hero(
tag: "zoom",
child: Image.file(...),
);
}
)
);
EDIT: I found barrier dismissable not working and found the solution here: Flutter SizeTransition and PageRouteBuilder not working
You will have to wrap the Hero widget with a defined width and height to get the optimum zoom level.
Related
I want to set the height for my cards based on the height of the widgets in it.
I use globalKey and set it in my widget but return null.
can anyone help me how can I do that?
final GlobalKey _Key = GlobalKey();
showModalBottomSheet(
context: context,
useRootNavigator: true,
isScrollControlled: true,
isDismissible: true,
enableDrag: true,
builder: (context) {
return Container(
key : _key,
child: ListView(
shrinkWrap: true,
padding: EdgeInsets.zero,
children: [
PressWidget(),
PaddingButtonCard(),
],
),
);
},
);
when I print _Key.currentContext?.findRenderObject().size , return null.
A Widget like a card should automatically wrap it's contents, so unless the contents have an unconstrained height (like a ListView or Expanded widget), you shouldn't need measuring or such techniques to achieve this.
Try, as a test, putting a Container with a set height inside your Card, and observe how the card automatically sizes itself:
Card(
child: Container(
height: 40,
width: double.maxFinite,
color: Colors.purple,
child: Text('Purple Card'),
),
),
I am trying to style ExpansionPanel which is inside ExpansionPanelList in Flutter but the background image is not applying to the whole header area of the panel.
I want to apply background image on the headerbuilder of expansionPanel.
Currenlty I'm trying to do it with the help of stack and giving background image to it. Doing this, Image is covering most of the header builder area but not covering area below arrow of expansionPanel.
I want the background image to also cover area underneath arrow of the expansion panel. How can I do that?
ExpansionPanelList(
expansionCallback: (index, isExpanded) { // Some code },
children: _items.map((MyItem _item) {
return ExpansionPanel(
canTapOnHeader: true,
backgroundColor: Colors.yellow,
// Want to add the picture in the background of
// header builder
headerBuilder: (context, isExpanded) {
return Stack(
children: [
// >>>>>>>>>>>>>> Image
Container(
child: Image.network(
_item.prodCtgData
.pic,
width: double.infinity,
fit: BoxFit.fitWidth,
),
),
// >>>>>>>>>>>>>> Text
Container(
alignment: Alignment.centerLeft,
child: Text("Data"),
),
],
);
},
isExpanded: _item.isExpanded,
body: GridView.count(
shrinkWrap: true,
physics:
NeverScrollableScrollPhysics(),
crossAxisCount: 4,
children:[
//Some data
]
),
);
}).toList(),
),
I am trying to create an app with a scroll view and the objects are clickable like the google news app. Can anyone answer how to animate the container to have a white glow on holding the tile?
Here is the list view builder I have for the app
Container(
padding: EdgeInsets.only(top: 16),
child: ListView.builder(
physics: ClampingScrollPhysics(),
itemCount: article.length,
scrollDirection: Axis.vertical,
shrinkWrap: true,
itemBuilder: (context, index) {
return news_tile(
imageurl: article[index].urlToimage,
news_title: article[index].title,
news_desc: article[index].description,
web_url: article[index].url
);
}),
)
and this is the contents of the tile which the list view builder calls
class news_tile extends StatelessWidget {
String imageurl, news_title, news_desc,web_url;
news_tile({this.imageurl, this.news_title, this.news_desc,this.web_url});
Widget build(BuildContext context) {
return GestureDetector(
onTap: (){
Navigator.push(context, MaterialPageRoute(
builder: (context) => article_view(
web_url: web_url,
)
));
},
child: Container(
margin: EdgeInsets.only(bottom: 16),
child: Column(
children: <Widget>[
ClipRRect(borderRadius: BorderRadius.circular(6), child: Image.network(imageurl)),
SizedBox(
height: 8,
),
Text(news_title, style: TextStyle(fontSize: 17,fontWeight: FontWeight.w600)),
SizedBox(
height: 8,
),
Text(news_desc, style: TextStyle(color: Colors.black54))
],
),
),
);
}
}
You could go with the InkWell Widget. It provides a tapping/holding color effect similar to that. Have a look at the official docs here:
https://api.flutter.dev/flutter/material/InkWell-class.html
Note that you need a Material Widget as an ancestor of your InkWell, but the docs explain that more.
Hope it works for you!
Edit: Sorry, since you are working with a Container, Ink is also important for you:
https://api.flutter.dev/flutter/material/Ink-class.html
Check the docs section "The ink splashes aren't visible!" for why that is.
I have a SingleChildScrollView widget in my app that contains a Column as a child.
The Column has many children and the last one in the very bottom of the scrolled screen is a StreamBuilder that I use to change a child Image
The issue is that when I tap on the image, the logic of the StreamBuilder works and the image is changed, but then the SingleChildScrollView scrolls a bit up so that the image is not visible and forces the user to scroll down again to be able to see the new loaded image.
Widget _buildScroll() => SingleChildScrollView(
child: Container(
width: 2080,
child: Column(
children: <Widget>[
_buildTopBar(),
_buildMainContent(),
SizedBox(height: 30),
Container(
child: Image.asset(
"assets/images/chart_legend.png",
width: 300,
),
),
SizedBox(height: 30),
Image.asset("assets/images/road_map.png", width: 600),
StreamBuilder<int>(
initialData: 1,
stream: _compareStream,
builder: (context, snapshot) {
if (snapshot.hasData) {
if (snapshot.data == 1) {
return Padding(
padding: const EdgeInsets.only(right: 10),
child: GestureDetector(
child: Image.asset("assets/images/compare1.png"),
onTap: () => _compareSubject.add(2),
),
);
} else if (snapshot.data == 2) {
return Padding(
padding: const EdgeInsets.only(right: 10),
child: GestureDetector(
child: Image.asset("assets/images/compare2.png"),
onTap: () => _compareSubject.add(3),
),
);
} else {
return Padding(
padding: const EdgeInsets.only(right: 10),
child: GestureDetector(
child: Image.asset("assets/images/compare3.png"),
onTap: () => _compareSubject.add(1),
),
);
}
}
return Padding(
padding: const EdgeInsets.only(right: 10),
child: GestureDetector(
child: Image.asset("assets/images/compare1.png"),
onTap: () {},
),
);
}),
],
),
),
);
However, even more weird is that, once I have done tap on all images, they will be showed as expected without scrolling up...meaning that, if there is the second time i tap on a image, the second time the image is replaced the scrolling up in not happening.
The problem here is that the size of your children changes and the SingleChildScrollView cannot handle that.
I think there could be two solutions that might work here:
If you know the sizes of your images before they are loaded, you should enforce it using a SizedBox. This way, the scroll position will stay the same:
SizedBox(
width: 300,
height: 120,
child: StreamBuilder<int>(...),
)
Use ensureVisible that you trigger once the stream builder is updated, which lets you control exactly where the image should be displayed.
You would need to assign a ScrollController to your SingleChildScrollView (controller parameter). Then, you also need a GlobalKey for your StreamBuilder that you want to show (key parameter).
If you have saved instances of the two to variables, you will be able to call the following once your image is loaded:
scrollController.position.ensureVisible(
globalKey.currentContext.findRenderObject(),
alignment: 0.5, // Aligns the image in the middle.
duration: const Duration(milliseconds: 120), // So it does not jump.
);
I have a home screen with a FAB and when it's pressed I want to display a dialog for user to input.
Currently I am using showDialog() with SimpleDialog.
showDialog(
context: context,
builder: (BuildContext context) {
return SimpleDialog(
title: NormalText('New Counter Item'),
contentPadding: EdgeInsets.fromLTRB(24.0, 0.0, 24.0, 24.0),
children: <Widget>[
Container(
...
)
],
);
}
);
But, I can't seem to customise almost anything with it (smaller, corner-curved and positioned lower on the screen). AlertDialog seems to be the same.
Is there anyway to customise those attributes?
return showDialog<void>(
barrierDismissible: true,
context: context,
builder: (BuildContext context) {
return new Column(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
Padding(
padding: const EdgeInsets.all(0),
child: new Container(
height: 100,
width: MediaQuery.of(context).size.width,
color: Colors.purple,
child: new Column(
children: <Widget>[
new Text(
'custom dialog text',
style: new TextStyle(
fontSize: 14,
color: Colors.white,
),
),
],
),
),
)
],
);
},
);
hope this helps,
thanks
SimpleDialog and AlertDialog are meant to cater to a specific set of needs. They have certain levels of customization, but ultimately they are meant to just show simple pop-up dialogs that give the user some information and prompt for a dialog response (i.e. "Yes", "No", "Cancel", "Save", etc.).
If you want to have a more customizable pop-up dialog, you will need to create your own. On the plus side, though, it's really quite simple. Have the builder in showDialog return a Dialog widget with a child set to whatever you want:
showDialog(
context: context,
builder: (BuildContext cxt) {
return Dialog(
child: Container(
...
),
);
},
);
Obviously you are going to need to recreate things like the title bar and action bar, but you can either crack open the source code of SimpleDialog and AlertDialog and copy what they have there or you can roll your own solution.
Despite what the accepted answer says; there are ways to customise the SimpleDialog in the ways that you have requested.
Size
The SimpleDialog will grow in width/height depending on the child and how it is padded. The below code will generate a dialog of width 336 and height 300:
showDialog(
context: context,
builder: (BuildContext context) {
return SimpleDialog(
insetPadding: EdgeInsets.zero,
titlePadding: EdgeInsets.zero,
contentPadding: EdgeInsets.zero,
children: [
Container(
width: 300,
height: 300,
),
],
);
},
);
Not sure what the added 36 pixels to the width is; but this demonstrates that size can be customised.
Corners
Corners can be customised using the shape property. The below code shows a green border with a rounded edge of 4 pixels:
showDialog(
context: context,
builder: (BuildContext context) {
return SimpleDialog(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(4.0),
side: BorderSide(
color: Colors.green,
),
),
/* ... */
);
},
);
Position
I've found that I can nudge the dialog up and down the page by using the insetPadding property. This defines the minimum amount of space required between the edge of the screen and the dialog. Although it's a bit cumbersome, if you knew the size of the screen and the size of the dialog, you could nudge the dialog's position with some simple math.
Given a screen height of 1920px, and a dialog height of 300px, the below code should place your dialog 100px from the top edge of your screen, rather than bang in the centre:
showDialog(
context: context,
builder: (BuildContext context) {
return SimpleDialog(
insetPadding: EdgeInsets.only(bottom: 1520),
/* ... */
);
},
);
This is because I've requested a minimum padding between the bottom edge of the screen and the dialog; and the only position for the dialog to exist under this stipulation is nearer the top.
No. These are not designed to be customizable. They were made to respect Material Design principles in mind.
If you want a custom design, you can make your own modal based of Align and/or DecoratedBox
It's not as scary as you might expect.
You only need to clone Dialog.dart, and
replace the Center widget with an Align.
Of course also rename stuff; e.g. MyDialog, myShowDialog, MySimpleDialog.
Yep, it's that easy.
And if you're on a roll, how about adding the Align widget's alignment parameter as an extra...
You can actually modify it's position (only height) by adding a SingleChildScrollView() in the builder + a padding (for the offset from the top) as follows:
showDialog<String>(
context: context,
builder: (ctxDialog) =>
SingleChildScrollView(
child: Padding(
padding: EdgeInsets.only(top: 150.0),
child: AlertDialog()
)
)
);
Here is a clean solution, If for some reason you have a TextField/TextFormField and in there you have a onsubmit property then you can follow:
onSubmit: () {
showDialog(
context: context,
builder: (context){
return WillPopScope(
onWillPop: () { return Future(() => false); }, // this will prevent going back
child: AlertDialog(
content: Row(
children: [
progressWidget(),
Container(margin: EdgeInsets.only(left: 10.0),child:Text("Loading" )),
],),
)
);
}
);
yourCallToMethod.whenComplete((){
Navigator.of(context).pop();
});
},
BENEFIT?
When the showAlert is shown if someone tap on the screen randomly or aggressively then the screen goes back. This prevents that behavior and only closes the showAlert when your function completes.
:- we can change vertical position of dialog boxes by give bottom
insetPadding like
insetPadding: EdgeInsets.only(bottom: XX);
:- And horizontal position by Horizontal padding or left
insetPadding: EdgeInsets.symmetric(horizontal:XX);
or
insetPadding: EdgeInsets.only(left: XX,right:YY);
I found the answer to it here. Thanks to #CopsOnRoad
Using showGeneralDialog
Scaffold(
floatingActionButton: FloatingActionButton(
child: Icon(Icons.add),
onPressed: () {
showGeneralDialog(
context: context,
barrierColor: Colors.black54,
barrierDismissible: true,
barrierLabel: 'Label',
pageBuilder: (_, __, ___) {
return Align(
alignment: Alignment.bottomLeft,
child: Container(
color: Colors.blue,
child: FlutterLogo(size: 150),
),
);
},
);
},
),
)
Solved that with wrapping dialog body in Stack and Positioned
Stack(
children: [
Positioned(
left: 100, // left coordinate
top: 100, // top coordinate
child: YOUR_DIALOG....