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Android embedding refactor pr3 add remaining systemchannels (flutter#…
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120 changes: 120 additions & 0 deletions
120
shell/platform/android/io/flutter/embedding/engine/systemchannels/AccessibilityChannel.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,120 @@ | ||
| package io.flutter.embedding.engine.systemchannels; | ||
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| import android.support.annotation.NonNull; | ||
| import android.support.annotation.Nullable; | ||
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| import java.util.HashMap; | ||
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| import io.flutter.embedding.engine.dart.DartExecutor; | ||
| import io.flutter.plugin.common.BasicMessageChannel; | ||
| import io.flutter.plugin.common.StandardMessageCodec; | ||
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| /** | ||
| * System channel that sends accessibility requests and events from Flutter to Android. | ||
| * <p> | ||
| * See {@link AccessibilityMessageHandler}, which lists all accessibility requests and | ||
| * events that might be sent from Flutter to the Android platform. | ||
| */ | ||
| public class AccessibilityChannel { | ||
| @NonNull | ||
| public BasicMessageChannel<Object> channel; | ||
| @Nullable | ||
| private AccessibilityMessageHandler handler; | ||
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| private final BasicMessageChannel.MessageHandler<Object> parsingMessageHandler = new BasicMessageChannel.MessageHandler<Object>() { | ||
| @Override | ||
| public void onMessage(Object message, BasicMessageChannel.Reply<Object> reply) { | ||
| // If there is no handler to respond to this message then we don't need to | ||
| // parse it. Return. | ||
| if (handler == null) { | ||
| return; | ||
| } | ||
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| @SuppressWarnings("unchecked") | ||
| final HashMap<String, Object> annotatedEvent = (HashMap<String, Object>) message; | ||
| final String type = (String) annotatedEvent.get("type"); | ||
| @SuppressWarnings("unchecked") | ||
| final HashMap<String, Object> data = (HashMap<String, Object>) annotatedEvent.get("data"); | ||
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| switch (type) { | ||
| case "announce": | ||
| String announceMessage = (String) data.get("message"); | ||
| if (announceMessage != null) { | ||
| handler.announce(announceMessage); | ||
| } | ||
| break; | ||
| case "tap": { | ||
| Integer nodeId = (Integer) annotatedEvent.get("nodeId"); | ||
| if (nodeId != null) { | ||
| handler.onTap(nodeId); | ||
| } | ||
| break; | ||
| } | ||
| case "longPress": { | ||
| Integer nodeId = (Integer) annotatedEvent.get("nodeId"); | ||
| if (nodeId != null) { | ||
| handler.onLongPress(nodeId); | ||
| } | ||
| break; | ||
| } | ||
| case "tooltip": { | ||
| String tooltipMessage = (String) data.get("message"); | ||
| if (tooltipMessage != null) { | ||
| handler.onTooltip(tooltipMessage); | ||
| } | ||
| break; | ||
| } | ||
| } | ||
| } | ||
| }; | ||
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| /** | ||
| * Constructs an {@code AccessibilityChannel} that connects Android to the Dart code | ||
| * running in {@code dartExecutor}. | ||
| * | ||
| * The given {@code dartExecutor} is permitted to be idle or executing code. | ||
| * | ||
| * See {@link DartExecutor}. | ||
| */ | ||
| public AccessibilityChannel(@NonNull DartExecutor dartExecutor) { | ||
| channel = new BasicMessageChannel<>(dartExecutor, "flutter/accessibility", StandardMessageCodec.INSTANCE); | ||
| channel.setMessageHandler(parsingMessageHandler); | ||
| } | ||
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| /** | ||
| * Sets the {@link AccessibilityMessageHandler} which receives all events and requests | ||
| * that are parsed from the underlying accessibility channel. | ||
| */ | ||
| public void setAccessibilityMessageHandler(@Nullable AccessibilityMessageHandler handler) { | ||
| this.handler = handler; | ||
| } | ||
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| /** | ||
| * Handler that receives accessibility messages sent from Flutter to Android | ||
| * through a given {@link AccessibilityChannel}. | ||
| * | ||
| * To register an {@code AccessibilityMessageHandler} with a {@link AccessibilityChannel}, | ||
| * see {@link AccessibilityChannel#setAccessibilityMessageHandler(AccessibilityMessageHandler)}. | ||
| */ | ||
| public interface AccessibilityMessageHandler { | ||
| /** | ||
| * The Dart application would like the given {@code message} to be announced. | ||
| */ | ||
| void announce(@NonNull String message); | ||
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| /** | ||
| * The user has tapped on the artifact with the given {@code nodeId}. | ||
| */ | ||
| void onTap(int nodeId); | ||
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| /** | ||
| * The user has long pressed on the artifact with the given {@code nodeId}. | ||
| */ | ||
| void onLongPress(int nodeId); | ||
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| /** | ||
| * The user has opened a popup window, menu, dialog, etc. | ||
| */ | ||
| void onTooltip(@NonNull String message); | ||
| } | ||
| } |
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