19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2006 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.text.style; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.text.TextPaint; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The classes that affect character-level text formatting extend this 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * class. Most extend its subclass {@link MetricAffectingSpan}, but simple 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * ones may just implement {@link UpdateAppearance}. 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic abstract class CharacterStyle { 278a985d24ce9a38f40ed88fecbdcd0e75e3a68f44John Spurlock public abstract void updateDrawState(TextPaint tp); 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A given CharacterStyle can only applied to a single region of a given 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Spanned. If you need to attach the same CharacterStyle to multiple 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * regions, you can use this method to wrap it with a new object that 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * will have the same effect but be a distinct object so that it can 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * also be attached without conflict. 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static CharacterStyle wrap(CharacterStyle cs) { 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (cs instanceof MetricAffectingSpan) { 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return new MetricAffectingSpan.Passthrough((MetricAffectingSpan) cs); 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return new Passthrough(cs); 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns "this" for most CharacterStyles, but for CharacterStyles 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * that were generated by {@link #wrap}, returns the underlying 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * CharacterStyle. 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public CharacterStyle getUnderlying() { 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return this; 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A Passthrough CharacterStyle is one that 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * passes {@link #updateDrawState} calls through to the 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * specified CharacterStyle while still being a distinct object, 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * and is therefore able to be attached to the same Spannable 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to which the specified CharacterStyle is already attached. 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static class Passthrough extends CharacterStyle { 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private CharacterStyle mStyle; 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Creates a new Passthrough of the specfied CharacterStyle. 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public Passthrough(CharacterStyle cs) { 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mStyle = cs; 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Passes updateDrawState through to the underlying CharacterStyle. 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void updateDrawState(TextPaint tp) { 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mStyle.updateDrawState(tp); 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns the CharacterStyle underlying this one, or the one 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * underlying it if it too is a Passthrough. 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public CharacterStyle getUnderlying() { 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mStyle.getUnderlying(); 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 88