BBCode in RichTextLabel

allows the display of complex text markup in a Control. It has a built-in API for generating the markup, but can also parse a BBCode.

Note that the BBCode tags can also be used, to some extent, in the XML source of the class reference.

For uniformly formatted text you can write in the “Text” property, but if you want to use BBCode markup you should use the “Text” property in the “Bb Code” section instead (bbcode_text). Writing to this property will trigger the parsing of your markup to format the text as requested. Before this happens, you need to toggle the “Enabled” checkbox in the “Bb Code” section (bbcode_enabled).

For example, BBCode [color=blue]blue[/color] would render the word “blue” with a blue color.

You’ll notice that after writing in the BBCode “Text” property the regular “Text” property now has the text without the BBCode. While the text property will be updated by the BBCode property, you can’t edit the text property or you’ll lose the BBCode markup. All changes to the text must be done in the BBCode parameter.

Note

For BBCode tags such as [b] (bold), [i] (italics) or [code] to work, you must set up custom fonts for the RichTextLabel node first.

There are no BBCode tags to control vertical centering of text yet.

List of valid color names for the [color=<name>] tag:

• aqua

• black

• blue

• fuchsia

• gray

• green

• lime

• maroon

• navy

• red

• teal

• white

• yellow

Hexadecimal color codes

For opaque RGB colors, any valid 6-digit hexadecimal code is supported, e.g. [color=#ffffff]white[/color]. Short RGB color codes such as #6f2 (equivalent to #66ff22) are also supported.

For transparent RGB colors, any 8-digit hexadecimal code can be used, e.g. [color=#88ffffff]translucent white[/color]. In this case, note that the alpha channel is the first component of the color code, not the last one. Short RGBA color codes such as #86f2 (equivalent to #8866ff22) are also supported.

Handling [url] tag clicks

By default, [url] tags do nothing when clicked. This is to allow flexible use of [url] tags rather than limiting them to opening URLs in a web browser.

To handle clicked [url] tags, connect the RichTextLabel node’s meta_clicked signal to a script function.

For example, the following method can be connected to meta_clicked to open clicked URLs using the user’s default web browser:

For more advanced use cases, it’s also possible to store JSON in an [url] tag’s option and parse it in the function that handles the meta_clicked signal. For example: [url={"example": "value"}]JSON[/url]

Image vertical offset

You use a custom font for your image in order to align it vertically.

1. Create a BitmapFont resource

2. Set this bitmap font with a positive value for the ascent property, that’s your height offset

3. Set the BBCode tag this way: [font=<font-path>][img]{image-path}[/img][/font]

BBCode can also be used to create different text animation effects. Five customizable effects are provided out of the box, and you can easily create your own.

Wave makes the text go up and down. Its tag format is [wave amp=50 freq=2][/wave]. amp controls how high and low the effect goes, and freq controls how fast the text goes up and down.

Tornado

Tornao makes the text move around in a circle. Its tag format is [tornado radius=5 freq=2][/tornado]. radius is the radius of the circle that controls the offset, freq is how fast the text moves in a circle.

Shake

Shake makes the text shake. Its tag format is [shake rate=5 level=10][/shake]. rate controls how fast the text shakes, controls how far the text is offset from the origin.

Fade

Fade creates a fade effect over the text that is not animated. Its tag format is [fade start=4 length=14][/fade]. start controls the starting position of the falloff relative to where the fade command is inserted, length controls over how many characters should the fade out take place.

Rainbow gives the text a rainbow color that changes over time. Its tag format is [rainbow freq=0.2 sat=10 val=20][/rainbow]. freq is the number of full rainbow cycles per second, sat is the saturation of the rainbow, val is the value of the rainbow.

You can extend the resource type to create your own custom BBCode tags. You begin by extending the RichTextEffect resource type. Add the tool prefix to your GDScript file if you wish to have these custom effects run within the editor itself. The RichTextLabel does not need to have a script attached, nor does it need to be running in tool mode. The new effect will be activable in the Inspector through the Custom Effects property.

There is only one function that you need to extend: _process_custom_fx(char_fx). Optionally, you can also provide a custom BBCode identifier simply by adding a member name bbcode. The code will check the bbcode property automatically or will use the name of the file to determine what the BBCode tag should be.

_process_custom_fx

This is where the logic of each effect takes place and is called once per character during the draw phase of text rendering. This passes in a CharFXTransform object, which holds a few variables to control how the associated character is rendered:

• identity specifies which custom effect is being processed. You should use that for code flow control.

• relative_index tells you how far into a given custom effect block you are in as an index.

• absolute_index tells you how far into the entire text you are as an index.

• elapsed_time is the total amount of time the text effect has been running.

• visible will tell you whether the character is visible or not and will also allow you to hide a given portion of text.

• offset is an offset position relative to where the given character should render under normal circumstances.

• color is the color of a given character.

• Finally, env is a of parameters assigned to a given custom effect. You can use get() with an optional default value to retrieve each parameter, if specified by the user. For example [custom_fx spread=0.5 color=#FFFF00]test[/custom_fx] would have a float spread and Color color parameters in its ` env` Dictionary. See below for more usage examples.

The last thing to note about this function is that it is necessary to return a boolean true value to verify that the effect processed correctly. This way, if there’s a problem with rendering a given character, it will back out of rendering custom effects entirely until the user fixes whatever error cropped up in their custom effect logic.

Ghost

Pulse

This will add a few new BBCode commands, which can be used like so: