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[Re-land] Remove WindowManager reflection in SingleViewPresentation.j…
…ava (flutter#50890) relands flutter#49996 Context b/326363243 [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
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65 changes: 65 additions & 0 deletions
65
shell/platform/android/io/flutter/plugin/platform/SingleViewFakeWindowViewGroup.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| // 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.plugin.platform; | ||
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| import android.content.Context; | ||
| import android.graphics.Rect; | ||
| import android.view.Gravity; | ||
| import android.view.View; | ||
| import android.view.ViewGroup; | ||
| import android.view.WindowManager; | ||
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| /* | ||
| * A view group that implements the same layout protocol that exist between the WindowManager and its direct | ||
| * children. | ||
| * | ||
| * Currently only a subset of the protocol is supported (gravity, x, and y). | ||
| */ | ||
| class SingleViewFakeWindowViewGroup extends ViewGroup { | ||
| // Used in onLayout to keep the bounds of the current view. | ||
| // We keep it as a member to avoid object allocations during onLayout which are discouraged. | ||
| private final Rect viewBounds; | ||
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| // Used in onLayout to keep the bounds of the child views. | ||
| // We keep it as a member to avoid object allocations during onLayout which are discouraged. | ||
| private final Rect childRect; | ||
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| public SingleViewFakeWindowViewGroup(Context context) { | ||
| super(context); | ||
| viewBounds = new Rect(); | ||
| childRect = new Rect(); | ||
| } | ||
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| @Override | ||
| protected void onLayout(boolean changed, int l, int t, int r, int b) { | ||
| for (int i = 0; i < getChildCount(); i++) { | ||
| View child = getChildAt(i); | ||
| WindowManager.LayoutParams params = (WindowManager.LayoutParams) child.getLayoutParams(); | ||
| viewBounds.set(l, t, r, b); | ||
| Gravity.apply( | ||
| params.gravity, | ||
| child.getMeasuredWidth(), | ||
| child.getMeasuredHeight(), | ||
| viewBounds, | ||
| params.x, | ||
| params.y, | ||
| childRect); | ||
| child.layout(childRect.left, childRect.top, childRect.right, childRect.bottom); | ||
| } | ||
| } | ||
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| @Override | ||
| protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { | ||
| for (int i = 0; i < getChildCount(); i++) { | ||
| View child = getChildAt(i); | ||
| child.measure(atMost(widthMeasureSpec), atMost(heightMeasureSpec)); | ||
| } | ||
| super.onMeasure(widthMeasureSpec, heightMeasureSpec); | ||
| } | ||
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| private static int atMost(int measureSpec) { | ||
| return MeasureSpec.makeMeasureSpec(MeasureSpec.getSize(measureSpec), MeasureSpec.AT_MOST); | ||
| } | ||
| } |
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