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feat(android): support text decoration features
* support `textDecorationColor` and `textDecorationStyle` props * improve `verticalAlign` with line-breaking
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149 changes: 149 additions & 0 deletions
149
.../native/android/src/main/java/com/tencent/renderer/component/text/TextDecorationSpan.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,149 @@ | ||
| /* Tencent is pleased to support the open source community by making Hippy available. | ||
| * Copyright (C) 2018 THL A29 Limited, a Tencent company. All rights reserved. | ||
| * | ||
| * 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. | ||
| */ | ||
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| package com.tencent.renderer.component.text; | ||
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| import android.graphics.Canvas; | ||
| import android.graphics.Color; | ||
| import android.graphics.Paint; | ||
| import android.text.TextPaint; | ||
| import android.text.style.CharacterStyle; | ||
| import android.text.style.ReplacementSpan; | ||
| import android.text.style.UpdateAppearance; | ||
| import android.util.Log; | ||
| import androidx.annotation.NonNull; | ||
| import androidx.annotation.Nullable; | ||
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| public class TextDecorationSpan extends CharacterStyle implements UpdateAppearance, TextLineMetricsHelper.LineMetrics { | ||
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| public static final int STYLE_SOLID = 0; | ||
| public static final int STYLE_DOUBLE = 1; | ||
| public static final int STYLE_DOTTED = 2; | ||
| public static final int STYLE_DASHED = 3; | ||
| // according to kStdUnderline_Thickness defined in aosp's Paint.h | ||
| private static final float THICKNESS = (1.0f / 18.0f); | ||
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| private final boolean underline; | ||
| private final boolean lineThrough; | ||
| private final int color; | ||
| private final int style; | ||
| private final boolean needSpecialDraw; | ||
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| private TextLineMetricsHelper helper; | ||
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| public TextDecorationSpan(boolean underline, boolean lineThrough, int color, int style) { | ||
| assert underline || lineThrough; | ||
| this.underline = underline; | ||
| this.lineThrough = lineThrough; | ||
| this.color = color; | ||
| this.style = style; | ||
| needSpecialDraw = style != STYLE_SOLID || (lineThrough && color != Color.TRANSPARENT); | ||
| } | ||
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| public boolean needSpecialDraw() { | ||
| return needSpecialDraw; | ||
| } | ||
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| @Override | ||
| public void updateDrawState(TextPaint tp) { | ||
| if (!underline && !lineThrough) { | ||
| // should never happened | ||
| return; | ||
| } | ||
| if (needSpecialDraw && helper != null) { | ||
| int color = this.color == Color.TRANSPARENT ? tp.getColor() : this.color; | ||
| helper.markTextDecoration(underline, lineThrough, color, style, tp.getTextSize()); | ||
| return; | ||
| } | ||
| if (underline) { | ||
| if (color == Color.TRANSPARENT || !trySetUnderlineColor(tp, color, tp.getTextSize() * THICKNESS)) { | ||
| tp.setUnderlineText(true); | ||
| } | ||
| } | ||
| if (lineThrough) { | ||
| tp.setStrikeThruText(true); | ||
| } | ||
| } | ||
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| private static boolean trySetUnderlineColor(TextPaint tp, int color, float thickness) { | ||
| try { | ||
| // Since these were @hide fields made public, we can link directly against it with | ||
| // a try/catch for its absence instead of doing the same through reflection. | ||
| // noinspection NewApi | ||
| tp.underlineColor = color; | ||
| // noinspection NewApi | ||
| tp.underlineThickness = thickness; | ||
| return true; | ||
| } catch (NoSuchFieldError e) { | ||
| return false; | ||
| } | ||
| } | ||
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| @Override | ||
| public void setLineMetrics(TextLineMetricsHelper helper) { | ||
| if (needSpecialDraw) { | ||
| this.helper = helper; | ||
| } | ||
| } | ||
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| public static final class StartMark extends ReplacementSpan implements TextLineMetricsHelper.LineMetrics { | ||
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| private TextLineMetricsHelper helper; | ||
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| @Override | ||
| public int getSize(@NonNull Paint paint, CharSequence text, int start, int end, | ||
| @Nullable Paint.FontMetricsInt fm) { | ||
| return 0; | ||
| } | ||
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| @Override | ||
| public void draw(@NonNull Canvas canvas, CharSequence text, int start, int end, float x, int top, int y, | ||
| int bottom, @NonNull Paint paint) { | ||
| if (helper != null) { | ||
| helper.markTextDecorationStart(this, start, x, y); | ||
| } | ||
| } | ||
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| @Override | ||
| public void setLineMetrics(TextLineMetricsHelper helper) { | ||
| this.helper = helper; | ||
| } | ||
| } | ||
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| public static final class EndMark extends ReplacementSpan implements TextLineMetricsHelper.LineMetrics { | ||
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| private TextLineMetricsHelper helper; | ||
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| @Override | ||
| public int getSize(@NonNull Paint paint, CharSequence text, int start, int end, | ||
| @Nullable Paint.FontMetricsInt fm) { | ||
| return 0; | ||
| } | ||
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| @Override | ||
| public void draw(@NonNull Canvas canvas, CharSequence text, int start, int end, float x, int top, int y, | ||
| int bottom, @NonNull Paint paint) { | ||
| if (helper != null) { | ||
| helper.markTextDecorationEnd(x); | ||
| } | ||
| } | ||
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| @Override | ||
| public void setLineMetrics(TextLineMetricsHelper helper) { | ||
| this.helper = helper; | ||
| } | ||
| } | ||
| } |
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