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/*
* 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;
}
}
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