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Reland No.2 "Hardware Keyboard: Android" (#33686)
* Original code * Changes * Fix and test Better formatted tests
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140 changes: 140 additions & 0 deletions
140
shell/platform/android/io/flutter/embedding/android/KeyData.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| // Copyright 2013 The Flutter Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
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| package io.flutter.embedding.android; | ||
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| import androidx.annotation.NonNull; | ||
| import androidx.annotation.Nullable; | ||
| import java.io.UnsupportedEncodingException; | ||
| import java.nio.ByteBuffer; | ||
| import java.nio.ByteOrder; | ||
|
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| /** | ||
| * The resulting Flutter key events generated by {@link KeyEmbedderResponder}, and are sent through | ||
| * the messenger after being marshalled with {@link #toBytes()}. | ||
| * | ||
| * <p>This class is the Java adaption of {@code KeyData} and {@code KeyDataPacket} in the C engine. | ||
| * Changes made to either side must also be made to the other. | ||
| * | ||
| * <p>Each {@link KeyData} corresponds to a {@code ui.KeyData} in the framework. | ||
| */ | ||
| public class KeyData { | ||
| private static final String TAG = "KeyData"; | ||
|
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| /** | ||
| * The channel that key data should be sent through. | ||
| * | ||
| * <p>Must be kept in sync with kFlutterKeyDataChannel in embedder.cc | ||
| */ | ||
| public static final String CHANNEL = "flutter/keydata"; | ||
|
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| // The number of fields except for `character`. | ||
| private static final int FIELD_COUNT = 5; | ||
| private static final int BYTES_PER_FIELD = 8; | ||
|
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| /** The action type of the key data. */ | ||
| public enum Type { | ||
| kDown(0), | ||
| kUp(1), | ||
| kRepeat(2); | ||
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| private long value; | ||
|
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| private Type(long value) { | ||
| this.value = value; | ||
| } | ||
|
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| public long getValue() { | ||
| return value; | ||
| } | ||
|
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| static Type fromLong(long value) { | ||
| switch ((int) value) { | ||
| case 0: | ||
| return kDown; | ||
| case 1: | ||
| return kUp; | ||
| case 2: | ||
| return kRepeat; | ||
| default: | ||
| throw new AssertionError("Unexpected Type value"); | ||
| } | ||
| } | ||
| } | ||
|
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| /** Creates an empty {@link KeyData}. */ | ||
| public KeyData() {} | ||
|
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| /** | ||
| * Unmarshal fields from a buffer. | ||
| * | ||
| * <p>For the binary format, see {@code lib/ui/window/key_data_packet.h}. | ||
| */ | ||
| public KeyData(@NonNull ByteBuffer buffer) { | ||
| final long charSize = buffer.getLong(); | ||
| this.timestamp = buffer.getLong(); | ||
| this.type = Type.fromLong(buffer.getLong()); | ||
| this.physicalKey = buffer.getLong(); | ||
| this.logicalKey = buffer.getLong(); | ||
| this.synthesized = buffer.getLong() != 0; | ||
|
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| if (buffer.remaining() != charSize) { | ||
| throw new AssertionError( | ||
| String.format( | ||
| "Unexpected char length: charSize is %d while buffer has position %d, capacity %d, limit %d", | ||
| charSize, buffer.position(), buffer.capacity(), buffer.limit())); | ||
| } | ||
| this.character = null; | ||
| if (charSize != 0) { | ||
| final byte[] strBytes = new byte[(int) charSize]; | ||
| buffer.get(strBytes, 0, (int) charSize); | ||
| try { | ||
| this.character = new String(strBytes, "UTF-8"); | ||
| } catch (UnsupportedEncodingException e) { | ||
| throw new AssertionError("UTF-8 unsupported"); | ||
| } | ||
| } | ||
| } | ||
|
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| long timestamp; | ||
| Type type; | ||
| long physicalKey; | ||
| long logicalKey; | ||
| boolean synthesized; | ||
|
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| /** The character of this key data encoded in UTF-8. */ | ||
| @Nullable String character; | ||
|
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| /** | ||
| * Marshal the key data to a new byte buffer. | ||
| * | ||
| * <p>For the binary format, see {@code lib/ui/window/key_data_packet.h}. | ||
| * | ||
| * @return the marshalled bytes. | ||
| */ | ||
| ByteBuffer toBytes() { | ||
| byte[] charBytes; | ||
| try { | ||
| charBytes = character == null ? null : character.getBytes("UTF-8"); | ||
| } catch (UnsupportedEncodingException e) { | ||
| throw new AssertionError("UTF-8 not supported"); | ||
| } | ||
| final int charSize = charBytes == null ? 0 : charBytes.length; | ||
| final ByteBuffer packet = | ||
| ByteBuffer.allocateDirect((1 + FIELD_COUNT) * BYTES_PER_FIELD + charSize); | ||
| packet.order(ByteOrder.LITTLE_ENDIAN); | ||
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| packet.putLong(charSize); | ||
| packet.putLong(timestamp); | ||
| packet.putLong(type.getValue()); | ||
| packet.putLong(physicalKey); | ||
| packet.putLong(logicalKey); | ||
| packet.putLong(synthesized ? 1L : 0L); | ||
| if (charBytes != null) { | ||
| packet.put(charBytes); | ||
| } | ||
|
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| return packet; | ||
| } | ||
| } |
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