How to deal with the numeric keypad in a canvas-based application? I want all the input features of text controls (like, switch between ABC/Abc/abc/123/T9, special chars input and stuff) without text controls.
There is no real way to do that. The best you can find is to duplicate by code all functions. The only library I'm aware of that gives you something like that is LWUIT, but it is way to heavy, and you don't get predictive text
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Am a newbee to javascript but have plenty of experience in VB, C, and even 86 assembler. Maybe I am trying to do the impossible in porting a VB app to js here. Basically, I need to change the color for only part of the string in an input element. Here is the problem:
A function takes an entered input box text field, and processes it first to see if it is in conformity to a set of requirements. If part of that string is not in conformity, I would like to in some way highlight that part in the input field. For instance, maybe I can send back the string to the input element (eg using the value attribute) but with some highlighting for that part, such as changing its text color or background color. Is this possible in js?
I'm not sure whether you can change colors of partial text in a simple text box. But what you're trying to do is certainly possible with this: https://editorjs.io/
The example on the homepage shows you how.
I hope this is a possibility for you and not too heavy for your purpose.
I am designing a calculator in android and I want to make a button for math pow operation. but instead of X^y, I want the button to show "y" as a propper superscript. also, a special sign for division operation rather than "/". is there a way to do this.
it would best if it was possible to write a line in Values/String.xml file. I can write the special symbol for the registered sign with this code "\u00AE" but codes like division doesn't work this way.
Here, รท, Copy paste this symbol, or alternatively you can use an image.
And as for the power thing. You've control over the whole UI, don't take it as a WordPad, why don't you use TextView and position it dynamically so that it looks like it is in the superscript? Like scaling it down, and translating a bit up in the y direction.
I've been pretty impressed with Katex's performance. It seems like a good fit as a rendering engine for a WYSIWIG latex editor. However, with MathJax, I can easily inject HTML/CSS in arbitrary locations using the \class directive. I can then use these injected classes for blinking cursors, gray boxes, and what not. For example:
Is there a way to do the same thing with Katex? In particular, I need the ability to inject HTML/CSS in arbitrary locations in the equation.
This is not currently supported. There is an open issue on the Github page.
I'm trying to make the avalonedit right-to-left layout, so that supporting languages that are right-to-left (e.g. Arabic)
The code seems to be too large to be understood, I need at least to know where my changes would be? What are main modules of it, or some diagrams/docs clarifying each component (other than the 4 images provided with the source)
I need at least to know what are the basic components of an editor. Thank you for help
The TextView class is responsible for the actual text rendering. The layout within text lines is done using the WPF TextFormatter (see #region BuildVisualLine in TextView.cs).
AvalonEdit already supports bidirectional text within a left-to-right paragraph, so the editor should work if you can get WPF to create right-to-left paragraphs.
I think it might be sufficient to change the VisualLineTextParagraphProperties.FlowDirection property.
Ideally the text view would use the value of TextView.FlowDirection for this, but I've seen some weird effects when using TextView.FlowDirection (text being mirrored). Not sure what's up with that; I'm not familiar with the way WPF works in a right-to-left context (I guess there's some auto-mirroring feature?).
I used DateField in a Form. When I try to select a date it opens up calendar functionality provided by cellphone.
As you know the UI features in j2me are not that great. I looked at third party libraries to design fancy UI. So far I have not found any api which makes DateField fancy. Is anybody aware of any API which supports DateField?
Using the phone's native control for this is exactly what j2me is supposed to do.
The system has clear advantages when changing the phone language, especially when the alphabet isn't in basic ASCII characters.
If you want to control exactly the way the calendar looks, you'll need to draw it yourself in a Canvas and deal with user input, screen size and localization issues yourself.
In general, you might want to look into the LWUIT library for an intermediary solution between fixed native controls and direct screen access.