72 lines
3.1 KiB
Java
72 lines
3.1 KiB
Java
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.messaging.ui;
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import android.graphics.drawable.Drawable;
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import android.graphics.drawable.InsetDrawable;
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/**
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* A "placeholder" drawable that has the same sizing properties as the real UI element it
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* replaces.
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*
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* This is an InsetDrawable that takes a placeholder drawable (an animation list, or simply
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* a color drawable) and place it in the center of the inset drawable that's sized to the
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* requested source width and height of the image that it replaces. Unlike the base
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* InsetDrawable, this implementation returns the true width and height of the real image
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* that it's placeholding, instead of the intrinsic size of the contained drawable, so that
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* when used in an ImageView, it may be positioned/scaled/cropped the same way the real
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* image is.
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*/
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public class PlaceholderInsetDrawable extends InsetDrawable {
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// The dimensions of the real image that this drawable is replacing.
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private final int mSourceWidth;
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private final int mSourceHeight;
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/**
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* Given a source drawable, wraps it around in this placeholder drawable by placing the
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* drawable at the center of the container if possible (or fill the container if the
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* drawable doesn't have intrinsic size such as color drawable).
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*/
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public static PlaceholderInsetDrawable fromDrawable(final Drawable drawable,
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final int sourceWidth, final int sourceHeight) {
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final int drawableWidth = drawable.getIntrinsicWidth();
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final int drawableHeight = drawable.getIntrinsicHeight();
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final int insetHorizontal = drawableWidth < 0 || drawableWidth > sourceWidth ?
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0 : (sourceWidth - drawableWidth) / 2;
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final int insetVertical = drawableHeight < 0 || drawableHeight > sourceHeight ?
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0 : (sourceHeight - drawableHeight) / 2;
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return new PlaceholderInsetDrawable(drawable, insetHorizontal, insetVertical,
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insetHorizontal, insetVertical, sourceWidth, sourceHeight);
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}
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private PlaceholderInsetDrawable(final Drawable drawable, final int insetLeft,
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final int insetTop, final int insetRight, final int insetBottom,
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final int sourceWidth, final int sourceHeight) {
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super(drawable, insetLeft, insetTop, insetRight, insetBottom);
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mSourceWidth = sourceWidth;
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mSourceHeight = sourceHeight;
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}
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@Override
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public int getIntrinsicWidth() {
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return mSourceWidth;
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}
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@Override
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public int getIntrinsicHeight() {
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return mSourceHeight;
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}
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} |