I'm trying to display formatted text that is created dynamically in the app. It is the result of a diff calculation and I can't see how RichText or any of the markdown formats would work. It doesn't seem like embedding HTML is the way to go, given that it seems that would display in a frame.
The code shows a static presentation of the code. I need to be able to use a list of objects and make an corresponding array of TextSpans. I'm not sure there is a way to do this.
I should add that the Styles I want are what you would see if editing text in MS Word: additions are colored green and deletions are red and crossed through. This part is easy in with RichText styles, but aren't supported by Markdown.
//This list of objects has the data I use will use to create the TextSpans.
List<DiffString> diffOut = diff(
oldStr,
newStr,
" ",
).pieces;
//
RichText(
text: TextSpan(
children: <TextSpan>[
TextSpan(
text: 'Hello ',
style: normalStyle,
),
TextSpan(
text: 'added',
style: addedStyle,
),
TextSpan(
text: 'deleted',
style: deletedStyle,
),
TextSpan(
text: ' \n\n',
style: normalStyle,
),
//TextSpan(text: 'default is messed up'),
],
),
),
pskink answered my question but then deleted it, so I'm posting it here. And yes, it just needed to map it like he said. Thanks!
/////////Here:
all you need is a List of TextSpans created by your diff calculation method and pass it as children: myListOfTextSpanDiffs - so for example: var myListOfTextSpanDiffs = diffOut.map(...).toList()
Related
i am creating a news App which i the content of the news is more than 2000 words, my problem is, i want to divide the content and put images in between them.
something like this
Note:
Both the images and text are coming from firebase...
i want to able to do irrespective the length of the words
You can use RichText widget for this types of complex UI.
RichText(
text: TextSpan(
children: [
TextSpan( text: "Some Text...", ),
WidgetSpan( child:
Image.network(src),
),
TextSpan( text: "Some Text...", ),
],
),
),
To cut a big sentence you can use the split method and create a list and save it as 2 different strings like
List<String> stringList = verylongSentence.split(" ");
int start = 0;
int end = 20;//get first 20 words
/// sublist of stringList
final joinedWords = stringList.sublist(start, end);
/// join the list with space
String _content1 = joinedWords.join(" ");
String _content2 = stringList.sublist(end).join(" ");
I have a string and I would like to have an icon from the material icons displayed in that string. Currently, the only workaround is to use the standard emoji codes (e.g. '\u26A0').
I'm not quite sure how to do this. The reason I can't use a widget here is because I'm using a validator, and if the amount of characters are not met, the validator returns a string that reads out what the issue is. I'm trying to add a warning icon to it.
Would appreciate some help, thanks in advance!
The solution to your use case is WidgetSpan here is simple example of how to use it
Text.rich(
TextSpan(
children: <InlineSpan>[
TextSpan(text: 'call me'),
WidgetSpan(
child:Icon(Icons.phone)
),
],
)
),
I have an api from which I am fetching messages. These messages might contain emoji.
When it does contain emoji Text Widget is not displaying it correctly.
I just want to display them on the screen. Help if possible.
Thank you :)
class Message{
String text;
Message(){
this.text = get_data_from_api()['text'];
}
}
message = Message();
return Container(
child: Text(message.text),
);
No Displaying text with Emojis on Flutter
won't do it. I can do that but it only works if you have emoji in a string, that is explicitly plasing an emoji in string works fine for me. but when I am using something similar to the code above. I am getting, this
enter image description here
digging more into it I found that if I print my response on console it is
"ðððð"
and if I print a emoji it is 😭
So
I am using
Response.fromStream(await request.send())
from http/http.dart
So is that the problem ?
I did figured it out
I was taking data from an API. So while decoding for some reason it was not decoding utf-8 so what I needed to do was add
utf8.decode(response.bodyBytes);
in place of response.body and it was solved
Reference: Emoji and accent encoding in dart/flutter
If you have an emoji image explicitly present in the response from your API and you want to display it in your text, your should try adding WidgetSpan inside your RichText below is an example of how to do it :
RichText(
text: TextSpan(
children: [
TextSpan(
text: "Click ",
),
WidgetSpan(
child: Icon(Icons.add, size: 14),
),
TextSpan(
text: " to add",
),
],
),
),
In the above example they have used the material icon( Icon(Icons.add)). If you want to replace that from the image your get from the API, you can use ImageIcon instead of Icon widget. Follow this link to know how to use ImageIcon : https://www.woolha.com/tutorials/flutter-using-imageicon-widget-examples
Reference : Add image to RichText element
I was wondering if there was a way to customize a TextFormField with more accuracy. I don't want to change the whole text color, but only part of it. For instance, below is the above mention TextFormField and I want to highlight "には" (ie what is between curly braces) by adding a red color. I would like to avoid creating multiple TextFormFields to do this because it will be a mess to assemble the text afterwards but I don't know if it is possible.
WARNING
I am not looking for the RichText widget since I want to customize a TextFormField Widget or any Widget with an editable text.
This Widget is used in a List so I would like not to use a "preview" widget with my input widget.
AND
I don't need a full RichTextEditor since the User should not be able to modify the color. Only parts between curly braces should automatically be colorised.
Looking forwards to see what kind of solutions you guys could come up with !
I've finally found a gist that match my request. For those who are searching an answer to my question, you seems to have to override EditableText (How to change color of particular text in a text field dynamically?). But, it's only a draft and it is not working correctly as for today. I'll try to follow this path and add my answer on this post.
EDIT:
The only thing you have to change to this answer is the following:
#override
TextSpan buildTextSpan() {
final String text = textEditingValue.text;
int textLength = text.length;
if (widget.annotations != null && textLength > 0) {
var items = getRanges();
var children = <TextSpan>[];
for (var item in items) {
if (item.range.end < textLength) {
children.add(
TextSpan(style: item.style, text: item.range.textInside(text)),
);
} else if (item.range.start <= textLength) {
children.add(
TextSpan(
style: item.style,
text: TextRange(start: item.range.start, end: text.length)
.textInside(text)),
);
}
}
return new TextSpan(style: widget.style, children: children);
}
return new TextSpan(style: widget.style, text: text);
}
}
Explanation:
You simply have to correct the buildTextSpan part. The error was raised when you delete a character because the Range could raise an exception when the range end was not meet.
This might not be exactly what you want, but may be this can help you get started in a way.
Use RichText widget.
var text = new RichText(
text: new TextSpan(
style: new TextStyle(
fontSize: 10.0,
),
children: <TextSpan>[
new TextSpan(text: 'Text1'),
new TextSpan(text: 'Text2', style: new TextStyle(),
],
),
);
For example, I may have one RichText in current widget tree, that looks like
RichText(
text: TextSpan(
text: 'Hello ',
style: DefaultTextStyle.of(context).style,
children: <TextSpan>[
TextSpan(text: 'bold', style: TextStyle(fontWeight: FontWeight.bold)),
TextSpan(text: ' world!'),
],
),
)
I try to use find.text('Hello bold world!') but it doesn't work because it's not a Text.
Framework solution
I have recently contributed this feature to the Flutter framework, i.e. to the built-in finders.
find.text()
You can now enable a findRichText parameter, which will then also find standalone RichText widgets:
find.text(
'Hello bold world!',
findRichText: true,
)
Simplest solution is to put a key on the RichText and read it that way.
If that's not a good fit for whatever reason, you can use find.byWidgetPredicate and pass a function that matches RichText widgets whose text.toPlainText() returns the string you want.
Here's the find.byWidgetPredicate call.
find.byWidgetPredicate((widget) => fromRichTextToPlainText(widget) == 'Hello bold world!')
Here's the fromRichTextToPlainText helper function. Pass it the RichText widget, it will return the plain text.
String fromRichTextToPlainText(final Widget widget) {
if (widget is RichText) {
if (widget.text is TextSpan) {
final buffer = StringBuffer();
(widget.text as TextSpan).computeToPlainText(buffer);
return buffer.toString();
}
}
return null;
}
I solved for this by digging into the widget a bit more manually
final richTextWidget = tester.element(richTextFinder).widget as RichText;
print(richTextWidget.text.children);
With the children, I can assert they are generated as expected