| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.view; |
| |
| import android.graphics.Outline; |
| import android.graphics.drawable.Drawable; |
| |
| /** |
| * Interface by which a View builds its {@link Outline}, used for shadow casting and clipping. |
| */ |
| public abstract class ViewOutlineProvider { |
| /** |
| * Default outline provider for Views, which queries the Outline from the View's background, |
| * or generates a 0 alpha, rectangular Outline the size of the View if a background |
| * isn't present. |
| * |
| * @see Drawable#getOutline(Outline) |
| */ |
| public static final ViewOutlineProvider BACKGROUND = new ViewOutlineProvider() { |
| @Override |
| public void getOutline(View view, Outline outline) { |
| Drawable background = view.getBackground(); |
| if (background != null) { |
| background.getOutline(outline); |
| } else { |
| outline.setRect(0, 0, view.getWidth(), view.getHeight()); |
| outline.setAlpha(0.0f); |
| } |
| } |
| }; |
| |
| /** |
| * Maintains the outline of the View to match its rectangular bounds, |
| * at <code>1.0f</code> alpha. |
| * |
| * This can be used to enable Views that are opaque but lacking a background cast a shadow. |
| */ |
| public static final ViewOutlineProvider BOUNDS = new ViewOutlineProvider() { |
| @Override |
| public void getOutline(View view, Outline outline) { |
| outline.setRect(0, 0, view.getWidth(), view.getHeight()); |
| } |
| }; |
| |
| /** |
| * Maintains the outline of the View to match its rectangular padded bounds, |
| * at <code>1.0f</code> alpha. |
| * |
| * This can be used to enable Views that are opaque but lacking a background cast a shadow. |
| */ |
| public static final ViewOutlineProvider PADDED_BOUNDS = new ViewOutlineProvider() { |
| @Override |
| public void getOutline(View view, Outline outline) { |
| outline.setRect(view.getPaddingLeft(), |
| view.getPaddingTop(), |
| view.getWidth() - view.getPaddingRight(), |
| view.getHeight() - view.getPaddingBottom()); |
| } |
| }; |
| |
| /** |
| * Called to get the provider to populate the Outline. |
| * |
| * This method will be called by a View when its owned Drawables are invalidated, when the |
| * View's size changes, or if {@link View#invalidateOutline()} is called |
| * explicitly. |
| * |
| * The input outline is empty and has an alpha of <code>1.0f</code>. |
| * |
| * @param view The view building the outline. |
| * @param outline The empty outline to be populated. |
| */ |
| public abstract void getOutline(View view, Outline outline); |
| } |