| /* |
| * Copyright (C) 2006 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.style; |
| |
| import android.graphics.Paint; |
| import android.graphics.Typeface; |
| import android.os.Parcel; |
| import android.text.ParcelableSpan; |
| import android.text.TextPaint; |
| import android.text.TextUtils; |
| |
| /** |
| * |
| * Describes a style in a span. |
| * Note that styles are cumulative -- if both bold and italic are set in |
| * separate spans, or if the base style is bold and a span calls for italic, |
| * you get bold italic. You can't turn off a style from the base style. |
| * |
| */ |
| public class StyleSpan extends MetricAffectingSpan implements ParcelableSpan { |
| |
| private final int mStyle; |
| |
| /** |
| * |
| * @param style An integer constant describing the style for this span. Examples |
| * include bold, italic, and normal. Values are constants defined |
| * in {@link android.graphics.Typeface}. |
| */ |
| public StyleSpan(int style) { |
| mStyle = style; |
| } |
| |
| public StyleSpan(Parcel src) { |
| mStyle = src.readInt(); |
| } |
| |
| public int getSpanTypeId() { |
| return getSpanTypeIdInternal(); |
| } |
| |
| /** @hide */ |
| public int getSpanTypeIdInternal() { |
| return TextUtils.STYLE_SPAN; |
| } |
| |
| public int describeContents() { |
| return 0; |
| } |
| |
| public void writeToParcel(Parcel dest, int flags) { |
| writeToParcelInternal(dest, flags); |
| } |
| |
| /** @hide */ |
| public void writeToParcelInternal(Parcel dest, int flags) { |
| dest.writeInt(mStyle); |
| } |
| |
| /** |
| * Returns the style constant defined in {@link android.graphics.Typeface}. |
| */ |
| public int getStyle() { |
| return mStyle; |
| } |
| |
| @Override |
| public void updateDrawState(TextPaint ds) { |
| apply(ds, mStyle); |
| } |
| |
| @Override |
| public void updateMeasureState(TextPaint paint) { |
| apply(paint, mStyle); |
| } |
| |
| private static void apply(Paint paint, int style) { |
| int oldStyle; |
| |
| Typeface old = paint.getTypeface(); |
| if (old == null) { |
| oldStyle = 0; |
| } else { |
| oldStyle = old.getStyle(); |
| } |
| |
| int want = oldStyle | style; |
| |
| Typeface tf; |
| if (old == null) { |
| tf = Typeface.defaultFromStyle(want); |
| } else { |
| tf = Typeface.create(old, want); |
| } |
| |
| int fake = want & ~tf.getStyle(); |
| |
| if ((fake & Typeface.BOLD) != 0) { |
| paint.setFakeBoldText(true); |
| } |
| |
| if ((fake & Typeface.ITALIC) != 0) { |
| paint.setTextSkewX(-0.25f); |
| } |
| |
| paint.setTypeface(tf); |
| } |
| } |