Is there a library that would give me 2D graphics with a focus on Text for Swing. I am building a simple form designer and need to position text correctly on a 2D display. It would be nice if there was a library that handled the newlines and possibly editing.
An approach I've used successfully in the past is to draw your form with Graphics2D into a single panel. Graphics2D gives you precise text and line positioning. When you want to edit the text, have the user click on the text and place a JTextArea or similar into the panel where the text is while the user edits.
I like the answer that suggests using a JTextArea when the user is going to edit text, since it is simple. However, if you want true in-place editing, while also rendering exactly your text content, you could investigate creating your own View implementation for a JEditorPane. This gives you a ready-made model and controller for editing, allowing you provide the presentation, so you can render as accurately as necessary. And with the JEditorPane.DefaultEditorKit available as source, you have plenty of guidance about how to implement your own View.
This may be overkill for your needs, or it may give you the fine level of control needed.
Related
i need to show a formatted text in a jframe, well is not that simple because i really lost in which component i must do this, i worked in visual time ago and there are a rich textbox that have all the function to do this work but in java, which is the similar swing component that can me allow to apply multiple fonts to specific portions of text, and if i can show the actual number of line and column in a label apart of where the cursor is in.
swing component that can me allow to apply multiple fonts to specific portions of text
Probably a JTextPane. See the section from the Swing tutorial on Text Component Features.
show the actual number of line and column in a label apart of where the cursor is in
You would need to use a CaretListener. You can then use the Text Utilities to get the current line/column values. You can then format a string containing the values and set the text in a label on your status bar.
So I've been developing web applications for 10 years, but have fond memories of working on small swing applications that related to an introductory programming curriculum I was paid to help with before that. I generally like building swing/java UI especially with a decent UI builder. However, in the intervening time I've become very accustomed to providing clear, red error messages of variable length and number when the data on a form is invalid. Sometimes with icons, sometimes with markers on the field etc. Very common stuff that's easy to do in the web world, and is really helpful and improves usability.
Today I was trying to find a way to display a nice list of error messages at the top or bottom of my swing form, icons and field markers can come later, but for now I just want a nice variable sized list of things that need to be corrected, in a red color.
At first blush this seems like it would be easy, but..
JLabel doesn't wrap, so long text is hidden, or you have to make the form ultra wide
JText Area has the same issue unless you define a number of columns, and I want to fill the space available. A set number of columns won't resize.
JTextPane wraps but as far as I can tell it won't turn red unless you get into the whole way over complicated StyledDocument bit. I don't want to do anything more complicated than change the text color so this seems like overkill.
There's also the minor issue of pushing outside the window space, and one can call pack(), but Id like to only increase the height of the form and wrap the text not change the dialog to the width of the message (creating lots of strained layout and dead space if a single long message doubles the width)
I also don't really want to have scroll bars either for the message area or the form as a whole.
This surely is a wheel that's already been invented, so what's the right way to show a list of red (but otherwise unformatted) error messages in a swing form?
Label doesn't wrap, so long text is hidden, or you have to make the
form ultra wide
use HTML
JText Area has the same issue unless you define a number of columns,
and I want to fill the space available. A set number of columns won't
resize.
use word and line wrap
A set number of columns won't resize. and together with "I also don't really want to have scroll bars"
put JTextArea to JScrollPane, to disable JScrollBars, set null for Borders from JScrollPane
JTextPane wraps but as far as I can tell it won't turn red unless you
get into the whole way over complicated StyledDocument bit. I don't
want to do anything more complicated than change the text color so
this seems like overkill.
use HighLighter, but nothing clear from posted description about your issue with StyledDocument
I have questions according to my final project in my IT Faculty.. I have to make A simple text editor (like notepad) without using JTextArea (GUI Java), I have to make my own JTextArea..
Idea/Topic= Own Text Editor
Algorithms= doesnt have any idea yet
Data Structure= Rope(Member of Binary Trees)
Requirement= Typing without JTextArea...
Is that possible to make that? Can a panel (or something else like that) has a listener or make a listener to do that?
simply thinking, First step I just want to try for typing on a panel, absolutely algorithms needed but i dont get right algorithms so far.. Is that possible?
My thinking is, for text that im typing is stored to a tree.. Is that Rope(Member of Binary Trees) for my data Structure?
Thanks for helping...
It's possible.
Use as you mentioned JPanel attaching KeyListener and MouseListener.
You need a model (Document). For simplest case it could be e.g StringBuilder where you can add content and show the StringBuilder content.
You need caret position (int field) to indicate where the edit should happen.
You need Font field to keep all the font info to be used in the editor.
Override paintComponent() and use FontMetrics to measure the text and calculate necessary width/height. For the start I would create a text area without line wrap.
Implement viewToModel/modelToView methods. They should calculate position of caret for given x,y and x,y for given caret position.
I am creating a java app that needs to display multiple documents worth of plain text. I have been playing around with JEditorPane (for each document to display text) with JTabbedPane (for document selection) but I think I would prefer to use something better (if it exists).
Is there an existing class that creates a dead simple editor with document selector functionality built in?
Nothing is built-in to do this, but JDesktopPane might be a better option for selection rather than a JTabbedPane.
For plain text, I would tend to prefer JTextArea "that displays multiple lines of text and optionally allows the user to edit the text." It is described in the article How to Use Text Areas. The append() method is particularly convenient. The articles Text Area Scrolling and Message Console are also very helpful.
I'm currently making a GWT project where I display some HTML in a RichTextArea, and I want the RichTextArea to be selectable/highlight-able by a mouse but NOT be editable/modifiable by the user. In addition to this question, could you also tell me how to retrieve some highlighted text in string from without me having to add a text-background toolbar, which, after highlighting a text from the RichTextArea, you change the color of the text-background, upon which, you add a separate periodically looping thread which checks to see when the text-background changes substantially from white (or a native color of the webpage) and finally extracting the string whose text-background color differs as the selected text.
I really hate to give any pointers without explanation but i think your requirements are bigger ::: so --->
http://examples.roughian.com/index.htm#Widgets~RichTextArea
http://www.java2s.com/Code/Java/GWT/RichTextArea.htm