I had posted the same question in oracle javafx forum too but haven't got a response. So trying my luck here.
I have a requirement where in the content of the text area is dynamically populated from the database. I am able to successfully retrieve and display the data on the text area.
However when the content is too large, I am not able to dynamically set the height of the text area. When I try to display the same as a label, the display is flawless, dynamically sets the height as per the content. So, I tried to create a label, with same content and dynamically bind the height to the preferred height as below, but it doesn't work.
// Generate User Note Description
TextArea textArea = new TextArea();
Label text = new Label();
// SETTING THE TEXT TO A LABEL TO RETRIEVE THE HEIGHT
text.setText(usrNotes.getNote().trim());
// ALWAYS DISPLAYS 0.0
System.out.println("height::"+text.getHeight());
if (isMyNote) {
// ALWAYS SETS TO THE MINIMUM HEIGHT OF 60.0
textArea.setText(usrNotes.getNote().trim());
textArea.setPrefWidth(Screen.getPrimary().getVisualBounds().getWidth() - 500.0);
textArea.setWrapText(true);
textArea.setMinHeight(60.0);
// WITHOUT THIS BINDING, DISPLAYS LOT OF EXTRA SPACE AFTER THE TEXT
textArea.prefHeightProperty().bind(text.heightProperty());
textArea.setStyle("-fx-padding:0 5 2 1; -fx-font-size: 1.1em;-fx-background-color:white");
} else if (!isMyNote) {
// THIS IS PERFECT, AS EXPECTED SETS THE HEIGHT DYNAMICALLY
text.setText(usrNotes.getNote().trim());
text.setStyle("-fx-padding:0 5 2 1;");
text.setStyle("-fx-border-color: white;-fx-font-size: 1.1em;-fx-background-color:#F5F5F5;");
text.setWrapText(true);
text.setPrefWidth(Screen.getPrimary().getVisualBounds().getWidth() - 500.0);
text.setMinHeight(60.0);
}
I would highly appreciate if someone can provide a hint on how to resolve this issue.
Thanks -SV
The reason text.getHeight() returns 0, (and therefore have to bind to text.heightProperty()) is because the height isn't calculated when the component is constructed. It is calculated when the component is rendered to the screen.
If you want to calculate a height ahead of time, I believe you will have to use something like FontMetrics (http://docs.oracle.com/javase/tutorial/2d/text/measuringtext.html) to calculate the width and line height of your string, break up the string into tokens to figure out where line breaks will fall (based on your width), and then figure out how many lines you will need (and therefore, how high your TextArea needs to be).
Related
our Java project has a problem and I need your advice:
We have a JTextPane component which is customized to support pagination. The component's content must be printed using JasperReport. The problem is: although we have used the same font's name, size, style, and page's height and width for the JTextPane and JasperReport, but the print-page is always different from the contents in the screen, typically a few characters are not aligned properly between the 2 devices (print-page and screen-page); as a result the content may be displayed in only 1 screen-page but will be printed into 2 pages.
EDIT:
There is a JTextarea (First text) with the same Font as the Jasper print (Second text) (DejaVu Serif 10), but the length of the texts are different.
The question is: I need the same text length on the screen and on the Jasper Print, but i dont know how to do that. For example I have a JTextarea with a fix width of pixel maybe 700. The jasper textfield has also a width of 700 pixel. Now I expect the text on the screen and on jasper ist exactly the same if I configure the same font, but there are different. What can I do to solve this problem?
Using netbeans I was able to show the content of my database using Jtable, but the problem is that when I run the file I got the Jtable but not all of the content of the indivdual record appear entirely. Because some columns has a paragraph entry not a few words
You'd have to be able to know the number of lines & the text height used by the jtable. From there you can set the row height (globally for the table, or for individual rows).
You would then need a table cell renderer capable of displaying multi line content.
Depending on your requirements, you'd might be better of displaying a one line summary of the cell & allow for tooltips to display the full content (depending on the size of te content) or a popup window with a none editable text component
UPDATE
Sorry for the short comment, I was on my IPad.
You have two choices, depending on what state your UI is in. You can grab a reference to the FontMatrics from the JTables graphics context. This will only work if the JTable has been realised (rendered on the screen)
FontMetrics fm = myTable.getFontMetrcis(myTable.getFont());
int height = fm.getHeight();
This example, of course, assumes you are using the same font as the JTable. If not, you'll need to supply the correct font.
Or, if the UI hasn't been realised yet, you'll need to construct a compatible image a extract the font metrics from it. This is a little more complicated as it begins to deal with the graphics configuration and devices...
BufferedImage img = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getDefaultConfiguration().createCompatibleImage(1, 1, Transparency.TRANSLUCENT);
Graphics2D g2d = img.createGraphics();
FontMetrics fm = g2d.getFontMetrics(font);
int height = fm.getHeight();
g2d.dispose();
Once you have the height of the font, you should be able to calculate the height of the text, assuming the text is broken up into lines (or you can split the lines your self). Now if that's not the case (or you want to provide you own word/line wrapping), this become increasingly complicated.
You can check here http://docs.oracle.com/javase/tutorial/2d/text/drawmulstring.html for how to render text using graphics2D for hints (you can use this to split text into groups as you need)
You might also want to check out http://www.jroller.com/santhosh/entry/multiline_in_table_cell_editing1 which shows a great idea for a multi line editor.
In Java when the text of the JLabel could not be displayed due to lack of space the text is truncated and "..." is added in the end.
How can I easily find out if currently JLabel displays full text or the truncated?
EDIT:
I see that there is a way to find out the size of the text by using FontMetrics. However this solution doesn't fully answers the question. In the case the text of JLabel contains HTML decorations the metrics.stringWidth() would also calculate width of HTML tags. So it could happen that result of metrics.stringWidth() would be grater than JLabel's width but still the text would be displayed correctly.
Is there a way know what decision took the JLabel itself while displaying the text. Has it decided to truncate the text or not.
The ellipsis is added by the label's UI delegate, typically a subclass of BasicLabelUI, as part of it's layout and preferred size calculation. The method layoutCL() may be overridden to examine the geometry, as shown on this example.
As a practical matter, I'd ignore the elision and show the full text in a tool tip.
From Oracle - Measuring Text:
// get metrics from the graphics
FontMetrics metrics = graphics.getFontMetrics(font);
// get the height of a line of text in this font and render context
int hgt = metrics.getHeight();
// get the advance of my text in this font and render context
int adv = metrics.stringWidth(text);
// calculate the size of a box to hold the text with some padding.
Dimension size = new Dimension(adv+2, hgt+2);
Compare size to the size of the JLabel.getSize();
I suppose if the component's preferred size is greater than it's actual size, then you can expect truncation. In order for this to work, of course, the component must already be realized.
Check this and see the layoutCompoundLabel() method. It returns a String representing the text of the label. You can compare it to the original to determine if it will be clipped.
Jim S.
The usual way to do this is to use a method that calculates the expected size of the text as it will be displayed in the label. If you're using a monospaced font, this is easy:
lengthOfChar * numChars
If you're not using a monospaced font, it's obviously much harder. I think there are some utilities around that will attempted to calculate this.
Once you have the size of the displayed string, you can compare to the length of the JLabel and see if the label is too small.
To get sizes of html text check this https://www.java.net/node/665691.
View view = (View) javax.swing.plaf.basic.BasicHTML.createHTMLView(label, value.toString());
int width = (int) view.getPreferredSpan(View.X_AXIS);
int height = (int) view.getPreferredSpan(View.Y_AXIS);
The only small problem is that it might have issues with non-html text. So, just use font metrics for non-html strings. The following worked perfectly for me:
if (value.toString().startsWith("<html>")) {
View view = (View) javax.swing.plaf.basic.BasicHTML.createHTMLView(label, value.toString());
width = (int) view.getPreferredSpan(View.X_AXIS);
}
else {
width = (int) label.getFontMetrics(label.getFont()).stringWidth(value.toString());
}
From an xml file, I'm given a width, height and id. All of them can and do vary very quickly. Now, I'm asked to draw a rectangle using the width and height (an easy task), and place the id at its center. The id must not overflow out of the rectangle it's contained it.
For single-character strings, this is also easy - set the font size to the height, play a bit with the x position maybe, and it's centered. The problem is when it's multi-character strings.
So given a width and height and a string, how can you determine what font-size the string should appear in? Assume you have every bit of information you need on the rectangle you're drawing the string in.
[Edit]: I'm using the Graphics 2D class to draw everything.
Start with selecting a Font at your preferred (i.e. maximum) size.
Grab the FontRenderContext from your Graphics2D object using getFontRenderContext.
Use getStringBounds() on the Font to be rendered to get a Rectangle2D object for the specific String to be rendered. That object describes the final size of the String using that Font
Check if the size specified by that Rectangle2D is small enough.
4a. If it is small enough, you're done. Use the last Font you've checked.
4b. If it is too big, use Font.derive() to produce a smaller version of the Font and continue to use that and loop back to 3.
Don't quite have the time to give you a full working example, but here are a couple pointers that should get you going in the right direction. The graphics object you are using to draw with has a getFontMetrics() method, one of the methods on FontMetrics is stringWidth(String str) which gives you the width of a string in the current Font.
If the width is too big for your rectangle set the Font on the Graphics object to the same font just with a smaller size until it fits.
To horizontally center a string in a container (learned long ago in typing class in high school):
(rectangleWidth / 2) - (stringWidth / 2)
http://download.oracle.com/javase/1.5.0/docs/api/java/awt/FontMetrics.html
To create a Font with a smaller size, something like:
Font font = graphics.getFont();
Font smallerFont = font.derive(font.getSize() - 1);
graphics.setFont(smallerFont);
Hope this gets you going in the right direction.
I would recommend for this problem to remove as many unknowns as possible. In this case, the problem chiefly is that font characters can vary in width... well most. That's why I would use a good monospace font like courier new for the ID, that way you know what the width of each character is, you know the width of your rectangle and you know the number of characters in your string. You can simply reduce the pixel size of each character will till your string fits the available width.
Example, if the width of each character is 12px and you have 10 characters in your ID, then you need 120px to fit everything in. If you only have 80px available, it's simple math 80/10 = 8px font-size (reduce half a pixel for padding if you want.
Just my suggestion.
I have a screen with a RitchTextField added, which has a custom font applied. I want to find the total number of lines that the RitchTextField can hold to avoid vertical scrolling.
I tried to do this by getting the height of the RichTextField then dividing it by the the height of the font, the problem however is using rtfField.getHeight() always returns the current height of field, and using the screens getHeight() returns the screen size not taking other fields into consideration.
For example:
Screen Size using getHeight() = 360.
Font Size using: this.rtfField.getFont().getHeight() = 25
Total Lines ~ 12
However doing a manual count the screen only comfortably displays 8 lines.
Not sure if this is what you're looking for, but I think you want the current height of the field divided by the font height:
int lines = this.rtfField.getHeight() / this.rtfField.getFont().getHeight();