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Expose a hasRenderedFirstFrame() method in FlutterView (#34275). (flutter/engine#9285)

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This commit is contained in:
Matt Carroll 2019-06-11 15:47:04 -07:00 committed by GitHub
parent aaee816c89
commit 6aed5635cd
1 changed files with 33 additions and 0 deletions
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33
engine/src/flutter/shell/platform/android/io/flutter/embedding/android/FlutterView.java
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@ -68,6 +68,7 @@ public class FlutterView extends FrameLayout {
// Internal view hierarchy references.
@Nullable
private FlutterRenderer.RenderSurface renderSurface;
private boolean didRenderFirstFrame;
// Connections to a Flutter execution context.
@Nullable
@ -97,6 +98,13 @@ public class FlutterView extends FrameLayout {
}
};
private final OnFirstFrameRenderedListener onFirstFrameRenderedListener = new OnFirstFrameRenderedListener() {
@Override
public void onFirstFrameRendered() {
didRenderFirstFrame = true;
}
};
/**
* Constructs a {@code FlutterView} programmatically, without any XML attributes.
* <p>
@ -171,11 +179,34 @@ public class FlutterView extends FrameLayout {
break;
}
// Register a listener for the first frame render event to set didRenderFirstFrame.
renderSurface.addOnFirstFrameRenderedListener(onFirstFrameRenderedListener);
// FlutterView needs to be focusable so that the InputMethodManager can interact with it.
setFocusable(true);
setFocusableInTouchMode(true);
}
/**
* Returns true if an attached {@link FlutterEngine} has rendered at least 1 frame to this
* {@code FlutterView}.
* <p>
* Returns false if no {@link FlutterEngine} is attached.
* <p>
* This flag is specific to a given {@link FlutterEngine}. The following hypothetical timeline
* demonstrates how this flag changes over time.
* <ol>
* <li>{@code flutterEngineA} is attached to this {@code FlutterView}: returns false</li>
* <li>{@code flutterEngineA} renders its first frame to this {@code FlutterView}: returns true</li>
* <li>{@code flutterEngineA} is detached from this {@code FlutterView}: returns false</li>
* <li>{@code flutterEngineB} is attached to this {@code FlutterView}: returns false</li>
* <li>{@code flutterEngineB} renders its first frame to this {@code FlutterView}: returns true</li>
* </ol>
*/
public boolean hasRenderedFirstFrame() {
return didRenderFirstFrame;
}
/**
* Adds the given {@code listener} to this {@code FlutterView}, to be notified upon Flutter's
* first rendered frame.
@ -471,6 +502,7 @@ public class FlutterView extends FrameLayout {
this.flutterEngine = flutterEngine;
// Instruct our FlutterRenderer that we are now its designated RenderSurface.
didRenderFirstFrame = false;
this.flutterEngine.getRenderer().attachToRenderSurface(renderSurface);
// Initialize various components that know how to process Android View I/O
@ -536,6 +568,7 @@ public class FlutterView extends FrameLayout {
textInputPlugin.getInputMethodManager().restartInput(this);
// Instruct our FlutterRenderer that we are no longer interested in being its RenderSurface.
didRenderFirstFrame = false;
flutterEngine.getRenderer().detachFromRenderSurface();
flutterEngine = null;