| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.text; |
| |
| import android.annotation.NonNull; |
| |
| // Based on the native implementation of Primitive in |
| // frameworks/base/core/jni/android_text_StaticLayout.cpp revision b808260 |
| public class Primitive { |
| public final @NonNull PrimitiveType type; |
| public final int location; |
| // The following fields don't make sense for all types. |
| // Box and Glue have width only. |
| // Penalty has both width and penalty. |
| // Word_break has penalty only. |
| public final float width; |
| public final float penalty; |
| |
| /** |
| * Use {@code PrimitiveType#getNewPrimitive()} |
| */ |
| private Primitive(@NonNull PrimitiveType type, int location, float width, float penalty) { |
| this.type = type; |
| this.location = location; |
| this.width = width; |
| this.penalty = penalty; |
| } |
| |
| public static enum PrimitiveType { |
| /** |
| * Something with a constant width that is to be typeset - like a character. |
| */ |
| BOX, |
| /** |
| * Blank space with fixed width. |
| */ |
| GLUE, |
| /** |
| * Aesthetic cost indicating how desirable breaking at this point will be. A penalty of |
| * {@link #PENALTY_INFINITY} means a forced non-break, whereas a penalty of negative |
| * {@code #PENALTY_INFINITY} means a forced break. |
| * <p/> |
| * Currently, it only stores penalty with values 0 or -infinity. |
| */ |
| PENALTY, |
| /** |
| * For tabs - variable width space. |
| */ |
| VARIABLE, |
| /** |
| * Possible breakpoints within a word. Think of this as a high cost {@link #PENALTY}. |
| */ |
| WORD_BREAK; |
| |
| public Primitive getNewPrimitive(int location) { |
| assert this == VARIABLE; |
| return new Primitive(this, location, 0f, 0f); |
| } |
| |
| public Primitive getNewPrimitive(int location, float value) { |
| assert this == BOX || this == GLUE || this == WORD_BREAK; |
| if (this == BOX || this == GLUE) { |
| return new Primitive(this, location, value, 0f); |
| } else { |
| return new Primitive(this, location, 0f, value); |
| } |
| } |
| |
| public Primitive getNewPrimitive(int location, float width, float penalty) { |
| assert this == PENALTY; |
| return new Primitive(this, location, width, penalty); |
| } |
| |
| // forced non-break, negative infinity is forced break. |
| public static final float PENALTY_INFINITY = 1e7f; |
| } |
| } |
| |