92 lines
3.0 KiB
Java
92 lines
3.0 KiB
Java
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/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.text.style;
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import android.annotation.NonNull;
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import android.text.TextPaint;
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/**
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* The classes that affect character-level text formatting in a way that
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* changes the width or height of characters extend this class.
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*/
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public abstract class MetricAffectingSpan
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extends CharacterStyle
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implements UpdateLayout {
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/**
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* Classes that extend MetricAffectingSpan implement this method to update the text formatting
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* in a way that can change the width or height of characters.
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*
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* @param textPaint the paint used for drawing the text
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*/
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public abstract void updateMeasureState(@NonNull TextPaint textPaint);
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/**
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* Returns "this" for most MetricAffectingSpans, but for
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* MetricAffectingSpans that were generated by {@link #wrap},
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* returns the underlying MetricAffectingSpan.
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*/
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@Override
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public MetricAffectingSpan getUnderlying() {
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return this;
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}
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/**
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* A Passthrough MetricAffectingSpan is one that
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* passes {@link #updateDrawState} and {@link #updateMeasureState}
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* calls through to the specified MetricAffectingSpan
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* while still being a distinct object,
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* and is therefore able to be attached to the same Spannable
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* to which the specified MetricAffectingSpan is already attached.
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*/
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/* package */ static class Passthrough extends MetricAffectingSpan {
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private MetricAffectingSpan mStyle;
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/**
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* Creates a new Passthrough of the specfied MetricAffectingSpan.
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*/
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Passthrough(@NonNull MetricAffectingSpan cs) {
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mStyle = cs;
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}
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/**
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* Passes updateDrawState through to the underlying MetricAffectingSpan.
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*/
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@Override
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public void updateDrawState(@NonNull TextPaint tp) {
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mStyle.updateDrawState(tp);
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}
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/**
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* Passes updateMeasureState through to the underlying MetricAffectingSpan.
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*/
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@Override
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public void updateMeasureState(@NonNull TextPaint tp) {
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mStyle.updateMeasureState(tp);
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}
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/**
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* Returns the MetricAffectingSpan underlying this one, or the one
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* underlying it if it too is a Passthrough.
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*/
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@Override
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public MetricAffectingSpan getUnderlying() {
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return mStyle.getUnderlying();
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}
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}
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}
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