how i can build a textField to change text direction line by line ( based on the first character )
For example, I want it to be displayed as below when typing 2 letters in different languages in the text field
// this line started with LTR characters, start at left
Hi Good morning
// this line started with RTL characters, start at right
سلام، صبح بخیر
Are you ok?
حالت خوبه؟
I looked at Flutter's code and noticed that Flutter uses text span to create text in the text field (that is, all the text can only be changed), is this possible with Flutter's own text field widget?
Related
I am trying to display text over time using altair (vega-lite), which works fine using a layered chart, where one is created using the alt.Chart().mark_text() function to display the text.
The text though is multiple phrases and should be wrapped (with line breaks). How can this be done?
(I do not want to use fixed line breaks, e.g. \n, at distinct positions since the text wrapping should work with zooming too)
Not exactly what you want, but you can specify a character on which to break to a new line. When zooming, the text stays the same size, so it should always fit the view.
For example making a new line for every word:
.mark_text(lineBreak=' ')
I have a text field which I need to style for example with bold or italics parts.
I tried overridding the TextEditingController's buildTextSpan and formatting the text using annotation ranges with custom styles but the edge cases were too much and I really couldn't get it to work.
So, thought about using a formatter where before every change in format I'll add a custom character, like this:
This text is |bBOLD and this is |iITALICS. Would get me this:
This text is BOLD and this is ITALICS. So I override the buildTextSpan to build the TextSpan from a parse function where I split the text by the special characters and check the initial letter of each text for formatting info.
This works well except for the fact that when I press the right arrow to go the next character after the "This text is ", the cursor will stay fixed as it thinks there are two characters but being only for formatting, they aren't there on the render.
Is there any way I could tell the textfield to ignore certain characters when selecting, moving selection or typing?
I think this would work!
static const kCharToBEIgnored = 0x2C;
// Here 0x2C means ',' comma
// For complete list visit https://api.flutter.dev/flutter/charcode/charcode-library.html
String get text {
return String.fromCharCodes(
_value.text.codeUnits.where((ch) => ch != kCharToBEIgnored),
);
}
I am trying to add line numbers to text field on Flutter, like on any text editors. I have text that overflows to next line, so I want to show where lines start and end.
First way that came to my mind was to separate the screen into two columns, one for line numbers on left and one for right for the textfield. However, due to screen size differences, I can't know when a line will overflow.
Is there any more formal way to do it?
First, initialize a List of TextField and an currentLine integer variables. TextField must contain properties named textInputAction and onEditingComplete. So each time you press enter, it is considered as finished with current TextField, creating a new TextField and add it into List of TextField and will move the focus to the new TextField. Line numbers will be coming from inputDecoration of each TextField and the value will be from currentLine variable. curentLine++ also ran inside onEditingComplete.
Check out this article about LineMetrics.
As you can see, this gives you a list of metadata concerning your rendered text lines. Using the line numbers and the hardBreak attribute together, you can compute the line numbers to display in the left hand column.
you can use TextSelection()
TextSelection selection = TextSelection(baseOffset: 0, extentOffset: text.length);
List<TextBox> boxes = textPainter.getBoxesForSelection(selection);
int numberOfLines = boxes.length;
get numberOfLines in your Text, count, and show for each line.
I'm working on an app that displays lyrics for several hymns in my native language.
Each line of the hymn is an individual Text Widget. I want the text to indent if it got softWrapped if user increases the font size to indicate that its not the next line. How can I achieve this effect?
Adding one or more tab escape characters "\t" to your strings may do the trick for you:
Text("\t this is a text string that will have an indentation",),
I am using an EditText to display text received from a serial port which is updated 10 times a second, it works fine but one of the lines of text has a character that alternates beyween a digit and a dash (-). Becuase the dash is narrower than the digit the rest of the line of text after this character jumps right-left as the digit and dash alternate.
How can I prevent this so either the digit or dash could be displayed without the rest of the line jumping?
TIA
You should use monospace font. You can either change it with the visual designer or by code:
EditText1.Typeface = Typeface.MONOSPACE
Visual designer:
You then should probably use monospace font:
<EditText android:typeface="monospace" [rest of attributes] />