程序包 ohos.agp.text

类 LengthFilter

java.lang.Object

ohos.agp.text.InputFilter

ohos.agp.text.LengthFilter

public final class LengthFilter
extends InputFilter

Filters plain text or RichText by length.

This can be used to limit the length of the input text within the specified editing area.

从以下版本开始:

7

嵌套类概要

从类继承的嵌套类/接口 ohos.agp.text.InputFilter

InputFilter.Range

构造器概要

构造器

构造器	说明
LengthFilter(int inMax)	Creates an instance of a string length filter.

方法概要

限定符和类型	方法	说明
CharSequence	filter(CharSequence source, InputFilter.Range sourceRange, CharSequence dest, InputFilter.Range destRange)	Filters the input text, which can be plain text or RichText.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

LengthFilter

public LengthFilter(int inMax)

Creates an instance of a string length filter.

参数:

inMax - Indicates the maximum length of a string.

从以下版本开始:

7

方法详细资料

filter

public CharSequence filter(CharSequence source,
                           InputFilter.Range sourceRange,
                           CharSequence dest,
                           InputFilter.Range destRange)

Filters the input text, which can be plain text or RichText. If the source is rich text, the text itself will change. In other cases, the text will not change. Depending on the derived class of InputFilter, determine whether to pass null to dest and destRange. For example, pass null if the derived class is CharInputFilter or UpperCaseFilter. For LengthFilter, do not pass null to dest and destRange, because these two parameters restrict the source text together with sourceRange.

指定者:

filter 在类中 InputFilter

参数:

source - Indicates that source strings to be filtered.

sourceRange - Indicates the filtering range of the source text. Only text in this range is filtered.

dest - Indicates the destination text.

destRange - Indicates the filtering range of the destination text.

返回:

Returns text after filtering; returns null if the input source text is null or the specified Range is invalid.