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Separate window dimensions change from orientation #15181

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Separate window dimensions change from orientation #15181

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da60ec7
Separate window dimensions change from orientation
Jul 14, 2017
80b5396
PR feedback: fixing indentation
Jul 25, 2017
e99afe2
Add missing import that got left out after merge
Jul 25, 2017
e5a2ae2
PR feedback: fixing style
Jul 25, 2017
3dd2a80
Merge branch 'master' into atsjenk/update-window-dimensions
shergin Jul 29, 2017
9738aa1
Merge branch 'master' into atsjenk/update-window-dimensions
shergin Aug 3, 2017
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36 changes: 32 additions & 4 deletions ReactAndroid/src/main/java/com/facebook/react/ReactRootView.java
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@
import android.os.Build;
import android.os.Bundle;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.MotionEvent;
import android.view.Surface;
import android.view.View;
Expand Down Expand Up @@ -357,6 +358,8 @@ private class CustomGlobalLayoutListener implements ViewTreeObserver.OnGlobalLay

private int mKeyboardHeight = 0;
private int mDeviceRotation = 0;
private DisplayMetrics mWindowMetrics = new DisplayMetrics();
private DisplayMetrics mScreenMetrics = new DisplayMetrics();

/* package */ CustomGlobalLayoutListener() {
DisplayMetricsHolder.initDisplayMetricsIfNotInitialized(getContext().getApplicationContext());
Expand All @@ -372,6 +375,7 @@ public void onGlobalLayout() {
}
checkForKeyboardEvents();
checkForDeviceOrientationChanges();
checkForDeviceDimensionsChanges();
}

private void checkForKeyboardEvents() {
Expand Down Expand Up @@ -404,13 +408,37 @@ private void checkForDeviceOrientationChanges() {
return;
}
mDeviceRotation = rotation;
// It's important to repopulate DisplayMetrics and export them before emitting the
// orientation change event, so that the Dimensions object returns the correct new values.
DisplayMetricsHolder.initDisplayMetrics(getContext());
emitUpdateDimensionsEvent();
emitOrientationChanged(rotation);
}

private void checkForDeviceDimensionsChanges() {
// Get current display metrics.
DisplayMetricsHolder.initDisplayMetrics(getContext());
// Check changes to both window and screen display metrics since they may not update at the same time.
if (!areMetricsEqual(mWindowMetrics, DisplayMetricsHolder.getWindowDisplayMetrics()) ||
!areMetricsEqual(mScreenMetrics, DisplayMetricsHolder.getScreenDisplayMetrics())) {
mWindowMetrics.setTo(DisplayMetricsHolder.getWindowDisplayMetrics());
mScreenMetrics.setTo(DisplayMetricsHolder.getScreenDisplayMetrics());
emitUpdateDimensionsEvent();
}
}

private boolean areMetricsEqual(DisplayMetrics displayMetrics, DisplayMetrics otherMetrics) {
if (Build.VERSION.SDK_INT >= 17) {
return displayMetrics.equals(otherMetrics);
} else {
// DisplayMetrics didn't have an equals method before API 17.
// Check all public fields manually.
return displayMetrics.widthPixels == otherMetrics.widthPixels &&
displayMetrics.heightPixels == otherMetrics.heightPixels &&
displayMetrics.density == otherMetrics.density &&
displayMetrics.densityDpi == otherMetrics.densityDpi &&
displayMetrics.scaledDensity == otherMetrics.scaledDensity &&
displayMetrics.xdpi == otherMetrics.xdpi &&
displayMetrics.ydpi == otherMetrics.ydpi;
}
}

private void emitOrientationChanged(final int newRotation) {
String name;
double rotationDegrees;
Expand Down