/**
* Updates the overlay-color rounding of the parent's child drawable.
*
* <ul>
* <li>If rounding mode is OVERLAY_COLOR and the child is not a RoundedCornersDrawable, a new
* RoundedCornersDrawable is created and the child gets wrapped with it.
* <li>If rounding mode is OVERLAY_COLOR and the child is already wrapped with a
* RoundedCornersDrawable, its rounding parameters are updated.
* <li>If rounding mode is not OVERLAY_COLOR and the child is wrapped with a
* RoundedCornersDrawable, the rounded drawable gets removed and its child gets attached
* directly to the parent.
* </ul>
*/
static void updateOverlayColorRounding(
DrawableParent parent, @Nullable RoundingParams roundingParams) {
Drawable child = parent.getDrawable();
if (roundingParams != null
&& roundingParams.getRoundingMethod() == RoundingParams.RoundingMethod.OVERLAY_COLOR) {
// Overlay rounding requested - either update the overlay params or add a new
// drawable that will do the requested rounding.
if (child instanceof RoundedCornersDrawable) {
RoundedCornersDrawable roundedCornersDrawable = (RoundedCornersDrawable) child;
applyRoundingParams(roundedCornersDrawable, roundingParams);
roundedCornersDrawable.setOverlayColor(roundingParams.getOverlayColor());
} else {
// Important: remove the child before wrapping it with a new parent!
child = parent.setDrawable(sEmptyDrawable);
child = maybeWrapWithRoundedOverlayColor(child, roundingParams);
parent.setDrawable(child);
}
} else if (child instanceof RoundedCornersDrawable) {
// Overlay rounding no longer required so remove drawable that was doing the rounding.
RoundedCornersDrawable roundedCornersDrawable = (RoundedCornersDrawable) child;
// Important: remove the child before wrapping it with a new parent!
child = roundedCornersDrawable.setCurrent(sEmptyDrawable);
parent.setDrawable(child);
// roundedCornersDrawable is removed and will get garbage collected, clear the child callback
sEmptyDrawable.setCallback(null);
}
}
/** Wraps the parent's child with a ScaleTypeDrawable. */
static ScaleTypeDrawable wrapChildWithScaleType(DrawableParent parent, ScaleType scaleType) {
Drawable child = parent.setDrawable(sEmptyDrawable);
child = maybeWrapWithScaleType(child, scaleType);
parent.setDrawable(child);
Preconditions.checkNotNull(child, "Parent has no child drawable!");
return (ScaleTypeDrawable) child;
}
/**
* Applies rounding on the drawable's leaf.
*
* <p>Currently only {@link BitmapDrawable} or {@link ColorDrawable} leafs can be rounded.
*
* <p>If the leaf cannot be rounded, or the rounding params do not specify BITMAP_ONLY mode, the
* given drawable is returned without being rounded.
*
* <p>If the given drawable is a leaf itself, and it can be rounded, then the rounded drawable is
* returned.
*
* <p>If the given drawable is not a leaf, and its leaf can be rounded, the leaf gets rounded, and
* the original drawable is returned.
*
* @return the rounded drawable, or the original drawable if the rounding didn't take place or it
* took place on a drawable's child
*/
static Drawable maybeApplyLeafRounding(
@Nullable Drawable drawable, @Nullable RoundingParams roundingParams, Resources resources) {
if (drawable == null
|| roundingParams == null
|| roundingParams.getRoundingMethod() != RoundingParams.RoundingMethod.BITMAP_ONLY) {
return drawable;
}
if (drawable instanceof ForwardingDrawable) {
DrawableParent parent = findDrawableParentForLeaf((ForwardingDrawable) drawable);
Drawable child = parent.setDrawable(sEmptyDrawable);
child = applyLeafRounding(child, roundingParams, resources);
parent.setDrawable(child);
return drawable;
} else {
return applyLeafRounding(drawable, roundingParams, resources);
}
}
/** Finds the immediate parent of a leaf drawable. */
static DrawableParent findDrawableParentForLeaf(DrawableParent parent) {
while (true) {
Drawable child = parent.getDrawable();
if (child == parent || !(child instanceof DrawableParent)) {
break;
}
parent = (DrawableParent) child;
}
return parent;
}
/**
* Updates the leaf rounding of the parent's child drawable.
*
* <ul>
* <li>If rounding mode is BITMAP_ONLY and the child is not a rounded drawable, it gets rounded
* with a new rounded drawable.
* <li>If rounding mode is BITMAP_ONLY and the child is already rounded, its rounding parameters
* are updated.
* <li>If rounding mode is not BITMAP_ONLY and the child is rounded, its rounding parameters are
* reset so that no rounding occurs.
* </ul>
*/
static void updateLeafRounding(
DrawableParent parent, @Nullable RoundingParams roundingParams, Resources resources) {
parent = findDrawableParentForLeaf(parent);
Drawable child = parent.getDrawable();
if (roundingParams != null
&& roundingParams.getRoundingMethod() == RoundingParams.RoundingMethod.BITMAP_ONLY) {
// Leaf rounding requested - either update the params or wrap the current drawable in a
// drawable that will round it.
if (child instanceof Rounded) {
Rounded rounded = (Rounded) child;
applyRoundingParams(rounded, roundingParams);
} else if (child != null) {
// Important: remove the child before wrapping it with a new parent!
parent.setDrawable(sEmptyDrawable);
Drawable rounded = applyLeafRounding(child, roundingParams, resources);
parent.setDrawable(rounded);
}
} else if (child instanceof Rounded) {
// No rounding requested - reset rounding params so no rounding occurs.
resetRoundingParams((Rounded) child);
}
}
