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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Eclipse Public License, Version 1.0 (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.eclipse.org/org/documents/epl-v10.php
*
* 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.ide.common.api;
import com.android.annotations.NonNull;
import com.google.common.annotations.Beta;
/**
* A {@link ResizePolicy} records state for whether a widget is resizable, and if so, in
* which directions
* <p>
* <b>NOTE: This is not a public or final API; if you rely on this be prepared
* to adjust your code for the next tools release.</b>
*/
@Beta
public class ResizePolicy {
private static final int NONE = 0;
private static final int LEFT_EDGE = 1;
private static final int RIGHT_EDGE = 2;
private static final int TOP_EDGE = 4;
private static final int BOTTOM_EDGE = 8;
private static final int PRESERVE_RATIO = 16;
// Aliases
private static final int HORIZONTAL = LEFT_EDGE | RIGHT_EDGE;
private static final int VERTICAL = TOP_EDGE | BOTTOM_EDGE;
private static final int ANY = HORIZONTAL | VERTICAL;
// Shared objects for common policies
private static final ResizePolicy sAny = new ResizePolicy(ANY);
private static final ResizePolicy sNone = new ResizePolicy(NONE);
private static final ResizePolicy sHorizontal = new ResizePolicy(HORIZONTAL);
private static final ResizePolicy sVertical = new ResizePolicy(VERTICAL);
private static final ResizePolicy sScaled = new ResizePolicy(ANY | PRESERVE_RATIO);
private final int mFlags;
// Use factory methods to construct
private ResizePolicy(int flags) {
mFlags = flags;
}
/**
* Returns true if this policy allows resizing in at least one direction
*
* @return true if this policy allows resizing in at least one direction
*/
public boolean isResizable() {
return (mFlags & ANY) != 0;
}
/**
* Returns true if this policy allows resizing the top edge
*
* @return true if this policy allows resizing the top edge
*/
public boolean topAllowed() {
return (mFlags & TOP_EDGE) != 0;
}
/**
* Returns true if this policy allows resizing the right edge
*
* @return true if this policy allows resizing the right edge
*/
public boolean rightAllowed() {
return (mFlags & RIGHT_EDGE) != 0;
}
/**
* Returns true if this policy allows resizing the bottom edge
*
* @return true if this policy allows resizing the bottom edge
*/
public boolean bottomAllowed() {
return (mFlags & BOTTOM_EDGE) != 0;
}
/**
* Returns true if this policy allows resizing the left edge
*
* @return true if this policy allows resizing the left edge
*/
public boolean leftAllowed() {
return (mFlags & LEFT_EDGE) != 0;
}
/**
* Returns true if this policy requires resizing in an aspect-ratio preserving manner
*
* @return true if this policy requires resizing in an aspect-ratio preserving manner
*/
public boolean isAspectPreserving() {
return (mFlags & PRESERVE_RATIO) != 0;
}
/**
* Returns a resize policy allowing resizing in any direction
*
* @return a resize policy allowing resizing in any direction
*/
@NonNull
public static ResizePolicy full() {
return sAny;
}
/**
* Returns a resize policy not allowing any resizing
*
* @return a policy which does not allow any resizing
*/
@NonNull
public static ResizePolicy none() {
return sNone;
}
/**
* Returns a resize policy allowing horizontal resizing only
*
* @return a policy which allows horizontal resizing only
*/
@NonNull
public static ResizePolicy horizontal() {
return sHorizontal;
}
/**
* Returns a resize policy allowing vertical resizing only
*
* @return a policy which allows vertical resizing only
*/
@NonNull
public static ResizePolicy vertical() {
return sVertical;
}
/**
* Returns a resize policy allowing scaled / aspect-ratio preserving resizing only
*
* @return a resize policy allowing scaled / aspect-ratio preserving resizing only
*/
@NonNull
public static ResizePolicy scaled() {
return sScaled;
}
/**
* Returns a resize policy with the specified resizability along the edges and the
* given aspect ratio behavior
* @param top whether the top edge is resizable
* @param right whether the right edge is resizable
* @param bottom whether the bottom edge is resizable
* @param left whether the left edge is resizable
* @param preserve whether the policy requires the aspect ratio to be preserved
* @return a resize policy recording the constraints required by the parameters
*/
@NonNull
public static ResizePolicy create(boolean top, boolean right, boolean bottom, boolean left,
boolean preserve) {
int mask = NONE;
if (top) mask |= TOP_EDGE;
if (right) mask |= RIGHT_EDGE;
if (bottom) mask |= BOTTOM_EDGE;
if (left) mask |= LEFT_EDGE;
if (preserve) mask |= PRESERVE_RATIO;
return new ResizePolicy(mask);
}
}
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