openfl.text.StyleSheet - OpenFL API Reference

The StyleSheet class lets you create a StyleSheet object that contains text formatting rules for font size, color, and other styles. You can then apply styles defined by a style sheet to a TextField object that contains HTML- or XML-formatted text. The text in the TextField object is automatically formatted according to the tag styles defined by the StyleSheet object. You can use text styles to define new formatting tags, redefine built-in HTML tags, or create style classes that you can apply to certain HTML tags.

To apply styles to a TextField object, assign the StyleSheet object to a TextField object's styleSheet property.

Note: A text field with a style sheet is not editable. In other words, a text field with the type property set to TextFieldType.INPUT applies the StyleSheet to the default text for the text field, but the content will no longer be editable by the user. Consider using the TextFormat class to assign styles to input text fields.

Flash Player supports a subset of properties in the original CSS1 specification ([https://www.w3.org/TR/REC-CSS1](www.w3.org/TR/REC-CSS1)). The following table shows the supported Cascading Style Sheet (CSS) properties and values, as well as their corresponding Haxe property names. (Each Haxe property name is derived from the corresponding CSS property name; if the name contains a hyphen, the hyphen is omitted and the subsequent character is capitalized.)

CSS property	Haxe property	Usage and supported values
`color`	`color`	Only hexadecimal color values are supported. Named colors (such as blue) are not supported. Colors are written in the following format: `#FF0000`.
`display`	`display`	Supported values are `inline`, `block`, and `none`.
`font-family`	`fontFamily`	A comma-separated list of fonts to use, in descending order of desirability. Any font family name can be used. If you specify a generic font name, it is converted to an appropriate device font. The following font conversions are available: `mono` is converted to `_typewriter`, `sans-serif` is converted to `_sans`, and `serif` is converted to `_serif`.
`font-size`	`fontSize`	Only the numeric part of the value is used. Units (px, pt) are not parsed; pixels and points are equivalent.
`font-style`	`fontStyle`	Recognized values are `normal` and `italic`.
`font-weight`	`fontWeight`	Recognized values are `normal` and `bold`.
`kerning`	`kerning`	Recognized values are `true` and `false`. Kerning is supported for embedded fonts only. Certain fonts, such as Courier New, do not support kerning. The kerning property is only supported in SWF files created in Windows, not in SWF files created on the Macintosh. However, these SWF files can be played in non-Windows versions of Flash Player and the kerning still applies.
`leading`	`leading`	The amount of space that is uniformly distributed between lines. The value specifies the number of pixels that are added after each line. A negative value condenses the space between lines. Only the numeric part of the value is used. Units (px, pt) are not parsed; pixels and points are equivalent.
`letter-spacing`	`letterSpacing`	The amount of space that is uniformly distributed between characters. The value specifies the number of pixels that are added after each character. A negative value condenses the space between characters. Only the numeric part of the value is used. Units (px, pt) are not parsed; pixels and points are equivalent.
`margin-left`	`marginLeft`	Only the numeric part of the value is used. Units (px, pt) are not parsed; pixels and points are equivalent.
`text-align`	`textAlign`	Recognized values are `left`, `center`, `right`, and `justify`.
`text-decoration`	`textDecoration`	Recognized values are `none` and `underline`.
`text-indent`	`textIndent`	Only the numeric part of the value is used. Units (px, pt) are not parsed; pixels and points are equivalent.

Constructor

`new()`

Creates a new StyleSheet object.

Variables

`read onlystyleNames:Array<String>`

An array that contains the names (as strings) of all of the styles registered in this style sheet.

Methods

`clear():Void`

Removes all styles from the style sheet object.

`getStyle(styleName:String):Object`

Returns a copy of the style object associated with the style named styleName. If there is no style object associated with styleName, null is returned.

Parameters:

`styleName`	A string that specifies the name of the style to retrieve.

Returns:

An object.

`parseCSS(CSSText:String):Void`

Parses the CSS in CSSText and loads the style sheet with it. If a style in CSSText is already in styleSheet, the properties in styleSheet are retained, and only the ones in CSSText are added or changed in styleSheet.

To extend the native CSS parsing capability, you can override this method by creating a subclass of the StyleSheet class.

Parameters:

`CSSText`	The CSS text to parse (a string).

`setStyle(styleName:String, styleObject:Object):Void`

Adds a new style with the specified name to the style sheet object. If the named style does not already exist in the style sheet, it is added. If the named style already exists in the style sheet, it is replaced. If the styleObject parameter is null, the named style is removed.

Flash Player creates a copy of the style object that you pass to this method.

For a list of supported styles, see the table in the description for the StyleSheet class.

Parameters:

`styleName`	A string that specifies the name of the style to add to the style sheet.
`styleObject`	An object that describes the style, or `null`.

`transform(formatObject:Object):TextFormat`

Extends the CSS parsing capability. Advanced developers can override this method by extending the StyleSheet class.

Parameters:

`formatObject`	An object that describes the style, containing style rules as properties of the object, or `null`.

Returns:

A TextFormat object containing the result of the mapping of CSS rules to text format properties.

Inherited Variables

Inherited Methods

Defined by EventDispatcher

`@:value({ useWeakReference : false, priority : 0, useCapture : false })addEventListener<T>(type:EventType<T>, listener:T ‑> Void, useCapture:Bool = false, priority:Int = 0, useWeakReference:Bool = false):Void`

Registers an event listener object with an EventDispatcher object so that the listener receives notification of an event. You can register event listeners on all nodes in the display list for a specific type of event, phase, and priority.

After you successfully register an event listener, you cannot change its priority through additional calls to addEventListener(). To change a listener's priority, you must first call removeListener(). Then you can register the listener again with the new priority level.

Keep in mind that after the listener is registered, subsequent calls to addEventListener() with a different type or useCapture value result in the creation of a separate listener registration. For example, if you first register a listener with useCapture set to true, it listens only during the capture phase. If you call addEventListener() again using the same listener object, but with useCapture set to false, you have two separate listeners: one that listens during the capture phase and another that listens during the target and bubbling phases.

You cannot register an event listener for only the target phase or the bubbling phase. Those phases are coupled during registration because bubbling applies only to the ancestors of the target node.

If you no longer need an event listener, remove it by calling removeEventListener(), or memory problems could result. Event listeners are not automatically removed from memory because the garbage collector does not remove the listener as long as the dispatching object exists(unless the useWeakReference parameter is set to true).

Copying an EventDispatcher instance does not copy the event listeners attached to it.(If your newly created node needs an event listener, you must attach the listener after creating the node.) However, if you move an EventDispatcher instance, the event listeners attached to it move along with it.

If the event listener is being registered on a node while an event is being processed on this node, the event listener is not triggered during the current phase but can be triggered during a later phase in the event flow, such as the bubbling phase.

If an event listener is removed from a node while an event is being processed on the node, it is still triggered by the current actions. After it is removed, the event listener is never invoked again(unless registered again for future processing).

Parameters:

`type`	The type of event.
`useCapture`	Determines whether the listener works in the capture phase or the target and bubbling phases. If `useCapture` is set to `true`, the listener processes the event only during the capture phase and not in the target or bubbling phase. If `useCapture` is `false`, the listener processes the event only during the target or bubbling phase. To listen for the event in all three phases, call `addEventListener` twice, once with `useCapture` set to `true`, then again with `useCapture` set to `false`.
`priority`	The priority level of the event listener. The priority is designated by a signed 32-bit integer. The higher the number, the higher the priority. All listeners with priority n are processed before listeners of priority n-1. If two or more listeners share the same priority, they are processed in the order in which they were added. The default priority is 0.
`useWeakReference`	Determines whether the reference to the listener is strong or weak. A strong reference(the default) prevents your listener from being garbage-collected. A weak reference does not. Class-level member functions are not subject to garbage collection, so you can set `useWeakReference` to `true` for class-level member functions without subjecting them to garbage collection. If you set `useWeakReference` to `true` for a listener that is a nested inner function, the function will be garbage-collected and no longer persistent. If you create references to the inner function (save it in another variable) then it is not garbage-collected and stays persistent. Weak references are supported on some OpenFL targets only, including html5, cpp, and flash/air. On other targets, this parameter is ignored, and the reference will be strong instead.

Throws:

`ArgumentError`	The `listener` specified is not a function.

`dispatchEvent(event:Event):Bool`

Dispatches an event into the event flow. The event target is the EventDispatcher object upon which the dispatchEvent() method is called.

Parameters:

`event`	The Event object that is dispatched into the event flow. If the event is being redispatched, a clone of the event is created automatically. After an event is dispatched, its `target` property cannot be changed, so you must create a new copy of the event for redispatching to work.

Returns:

A value of true if the event was successfully dispatched. A value of false indicates failure or that preventDefault() was called on the event.

Throws:

`Error`	The event dispatch recursion limit has been reached.

`hasEventListener(type:String):Bool`

Checks whether the EventDispatcher object has any listeners registered for a specific type of event. This allows you to determine where an EventDispatcher object has altered handling of an event type in the event flow hierarchy. To determine whether a specific event type actually triggers an event listener, use willTrigger().

The difference between hasEventListener() and willTrigger() is that hasEventListener() examines only the object to which it belongs, whereas willTrigger() examines the entire event flow for the event specified by the type parameter.

When hasEventListener() is called from a LoaderInfo object, only the listeners that the caller can access are considered.

Parameters:

`type`	The type of event.

Returns:

A value of true if a listener of the specified type is registered; false otherwise.

`@:value({ useCapture : false })removeEventListener<T>(type:EventType<T>, listener:T ‑> Void, useCapture:Bool = false):Void`

Removes a listener from the EventDispatcher object. If there is no matching listener registered with the EventDispatcher object, a call to this method has no effect.

Parameters:

`type`	The type of event.
`useCapture`	Specifies whether the listener was registered for the capture phase or the target and bubbling phases. If the listener was registered for both the capture phase and the target and bubbling phases, two calls to `removeEventListener()` are required to remove both, one call with `useCapture()` set to `true`, and another call with `useCapture()` set to `false`.

`toString():String`

`willTrigger(type:String):Bool`

Checks whether an event listener is registered with this EventDispatcher object or any of its ancestors for the specified event type. This method returns true if an event listener is triggered during any phase of the event flow when an event of the specified type is dispatched to this EventDispatcher object or any of its descendants.

The difference between the hasEventListener() and the willTrigger() methods is that hasEventListener() examines only the object to which it belongs, whereas the willTrigger() method examines the entire event flow for the event specified by the type parameter.

When willTrigger() is called from a LoaderInfo object, only the listeners that the caller can access are considered.

Parameters:

`type`	The type of event.

Returns:

A value of true if a listener of the specified type will be triggered; false otherwise.

class StyleSheet

package openfl.text

extends EventDispatcher

Constructor

`new()`

Variables

`read onlystyleNames:Array<String>`

Methods

`clear():Void`

`getStyle(styleName:String):Object`

`parseCSS(CSSText:String):Void`

`setStyle(styleName:String, styleObject:Object):Void`

`transform(formatObject:Object):TextFormat`

Inherited Variables

Inherited Methods

Defined by EventDispatcher

`@:value({ useWeakReference : false, priority : 0, useCapture : false })addEventListener<T>(type:EventType<T>, listener:T ‑> Void, useCapture:Bool = false, priority:Int = 0, useWeakReference:Bool = false):Void`

`dispatchEvent(event:Event):Bool`

`hasEventListener(type:String):Bool`

`@:value({ useCapture : false })removeEventListener<T>(type:EventType<T>, listener:T ‑> Void, useCapture:Bool = false):Void`

`toString():String`

`willTrigger(type:String):Bool`