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Diffstat (limited to 'src/com/android/messaging/ui/PlaceholderInsetDrawable.java')
| -rw-r--r-- | src/com/android/messaging/ui/PlaceholderInsetDrawable.java | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/src/com/android/messaging/ui/PlaceholderInsetDrawable.java b/src/com/android/messaging/ui/PlaceholderInsetDrawable.java new file mode 100644 index 0000000..dda2e7b --- /dev/null +++ b/src/com/android/messaging/ui/PlaceholderInsetDrawable.java @@ -0,0 +1,72 @@ +/* + * Copyright (C) 2015 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 com.android.messaging.ui; + +import android.graphics.drawable.Drawable; +import android.graphics.drawable.InsetDrawable; + +/** + * A "placeholder" drawable that has the same sizing properties as the real UI element it + * replaces. + * + * This is an InsetDrawable that takes a placeholder drawable (an animation list, or simply + * a color drawable) and place it in the center of the inset drawable that's sized to the + * requested source width and height of the image that it replaces. Unlike the base + * InsetDrawable, this implementation returns the true width and height of the real image + * that it's placeholding, instead of the intrinsic size of the contained drawable, so that + * when used in an ImageView, it may be positioned/scaled/cropped the same way the real + * image is. + */ +public class PlaceholderInsetDrawable extends InsetDrawable { + // The dimensions of the real image that this drawable is replacing. + private final int mSourceWidth; + private final int mSourceHeight; + + /** + * Given a source drawable, wraps it around in this placeholder drawable by placing the + * drawable at the center of the container if possible (or fill the container if the + * drawable doesn't have intrinsic size such as color drawable). + */ + public static PlaceholderInsetDrawable fromDrawable(final Drawable drawable, + final int sourceWidth, final int sourceHeight) { + final int drawableWidth = drawable.getIntrinsicWidth(); + final int drawableHeight = drawable.getIntrinsicHeight(); + final int insetHorizontal = drawableWidth < 0 || drawableWidth > sourceWidth ? + 0 : (sourceWidth - drawableWidth) / 2; + final int insetVertical = drawableHeight < 0 || drawableHeight > sourceHeight ? + 0 : (sourceHeight - drawableHeight) / 2; + return new PlaceholderInsetDrawable(drawable, insetHorizontal, insetVertical, + insetHorizontal, insetVertical, sourceWidth, sourceHeight); + } + + private PlaceholderInsetDrawable(final Drawable drawable, final int insetLeft, + final int insetTop, final int insetRight, final int insetBottom, + final int sourceWidth, final int sourceHeight) { + super(drawable, insetLeft, insetTop, insetRight, insetBottom); + mSourceWidth = sourceWidth; + mSourceHeight = sourceHeight; + } + + @Override + public int getIntrinsicWidth() { + return mSourceWidth; + } + + @Override + public int getIntrinsicHeight() { + return mSourceHeight; + } +}
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