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Update BottomAppBar to react to layout changes in FAB

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PiperOrigin-RevId: 250527847
This commit is contained in:
cketcham 2019-05-29 14:11:25 -04:00 committed by Daniel Nizri
parent daa3a04069
commit a9f95ecbc7
1 changed files with 52 additions and 18 deletions
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70
lib/java/com/google/android/material/bottomappbar/BottomAppBar.java
View File

@ -63,6 +63,7 @@ import androidx.coordinatorlayout.widget.CoordinatorLayout;
import androidx.coordinatorlayout.widget.CoordinatorLayout.AttachedBehavior;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.List;
@ -420,11 +421,14 @@ public class BottomAppBar extends Toolbar implements AttachedBehavior {
* Sets the fab diameter. This will be called automatically by the {@link BottomAppBar.Behavior}
* if the fab is anchored to this {@link BottomAppBar}.
*/
void setFabDiameter(@Px int diameter) {
boolean setFabDiameter(@Px int diameter) {
if (diameter != getTopEdgeTreatment().getFabDiameter()) {
getTopEdgeTreatment().setFabDiameter(diameter);
materialShapeDrawable.invalidateSelf();
return true;
}
return false;
}
private void maybeAnimateModeChange(@FabAlignmentMode int targetMode) {
@ -810,6 +814,47 @@ public class BottomAppBar extends Toolbar implements AttachedBehavior {
private final Rect fabContentRect;
private WeakReference<BottomAppBar> viewRef;
private final OnLayoutChangeListener fabLayoutListener = new OnLayoutChangeListener() {
@Override
public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft,
int oldTop, int oldRight, int oldBottom) {
BottomAppBar child = viewRef.get();
// If the child BAB no longer exists, remove the listener.
if (child == null || !(v instanceof FloatingActionButton)) {
v.removeOnLayoutChangeListener(this);
return;
}
FloatingActionButton fab = ((FloatingActionButton) v);
fab.getMeasuredContentRect(fabContentRect);
int height = fabContentRect.height();
// Set the cutout diameter based on the height of the fab.
if (!child.setFabDiameter(height)) {
// The size of the fab didn't change so return early.
return;
}
CoordinatorLayout.LayoutParams fabLayoutParams = (CoordinatorLayout.LayoutParams) v
.getLayoutParams();
// Set the bottomMargin of the fab if it is 0dp. This adds space below the fab if the
// BottomAppBar is hidden.
if (fabLayoutParams.bottomMargin == 0) {
// Extra padding is added for the fake shadow on API < 21. Ensure we don't add too much
// space by removing that extra padding.
int bottomShadowPadding = (fab.getMeasuredHeight() - fabContentRect.height()) / 2;
int bottomMargin = child.getResources()
.getDimensionPixelOffset(R.dimen.mtrl_bottomappbar_fab_bottom_margin);
fabLayoutParams.bottomMargin = Math.max(0, bottomMargin - bottomShadowPadding);
}
}
};
public Behavior() {
fabContentRect = new Rect();
}
@ -822,6 +867,8 @@ public class BottomAppBar extends Toolbar implements AttachedBehavior {
@Override
public boolean onLayoutChild(
CoordinatorLayout parent, BottomAppBar child, int layoutDirection) {
viewRef = new WeakReference<>(child);
View dependentView = child.findDependentView();
if (dependentView != null && !ViewCompat.isLaidOut(dependentView)) {
// Set the initial position of the FloatingActionButton with the BottomAppBar vertical
@ -832,25 +879,12 @@ public class BottomAppBar extends Toolbar implements AttachedBehavior {
if (dependentView instanceof FloatingActionButton) {
FloatingActionButton fab = ((FloatingActionButton) dependentView);
// Always update the BAB if the fab is laid out.
fab.addOnLayoutChangeListener(fabLayoutListener);
// Ensure the FAB is correctly linked to this BAB so the animations can run correctly
child.addFabAnimationListeners(fab);
// Set the correct cutout diameter
fab.getMeasuredContentRect(fabContentRect);
child.setFabDiameter(fabContentRect.height());
// Set the bottomMargin of the fab if it is 0dp. This adds space below the fab if the
// BottomAppBar is hidden.
if (fabLayoutParams.bottomMargin == 0) {
// Extra padding is added for the fake shadow on API < 21. Ensure we don't add too much
// space by removing that extra padding.
int bottomShadowPadding = (fab.getMeasuredHeight() - fabContentRect.height()) / 2;
int bottomMargin =
child
.getResources()
.getDimensionPixelOffset(R.dimen.mtrl_bottomappbar_fab_bottom_margin);
fabLayoutParams.bottomMargin = Math.max(0, bottomMargin - bottomShadowPadding);
}
}
// Move the fab to the correct position