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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 
     18 package android.widget;
     19 
     20 /**
     21  * RtlSpacingHelper manages the relationship between left/right and start/end for views
     22  * that need to maintain both absolute and relative settings for a form of spacing similar
     23  * to view padding.
     24  */
     25 class RtlSpacingHelper {
     26     public static final int UNDEFINED = Integer.MIN_VALUE;
     27 
     28     private int mLeft = 0;
     29     private int mRight = 0;
     30     private int mStart = UNDEFINED;
     31     private int mEnd = UNDEFINED;
     32     private int mExplicitLeft = 0;
     33     private int mExplicitRight = 0;
     34 
     35     private boolean mIsRtl = false;
     36     private boolean mIsRelative = false;
     37 
     38     public int getLeft() {
     39         return mLeft;
     40     }
     41 
     42     public int getRight() {
     43         return mRight;
     44     }
     45 
     46     public int getStart() {
     47         return mIsRtl ? mRight : mLeft;
     48     }
     49 
     50     public int getEnd() {
     51         return mIsRtl ? mLeft : mRight;
     52     }
     53 
     54     public void setRelative(int start, int end) {
     55         mStart = start;
     56         mEnd = end;
     57         mIsRelative = true;
     58         if (mIsRtl) {
     59             if (end != UNDEFINED) mLeft = end;
     60             if (start != UNDEFINED) mRight = start;
     61         } else {
     62             if (start != UNDEFINED) mLeft = start;
     63             if (end != UNDEFINED) mRight = end;
     64         }
     65     }
     66 
     67     public void setAbsolute(int left, int right) {
     68         mIsRelative = false;
     69         if (left != UNDEFINED) mLeft = mExplicitLeft = left;
     70         if (right != UNDEFINED) mRight = mExplicitRight = right;
     71     }
     72 
     73     public void setDirection(boolean isRtl) {
     74         if (isRtl == mIsRtl) {
     75             return;
     76         }
     77         mIsRtl = isRtl;
     78         if (mIsRelative) {
     79             if (isRtl) {
     80                 mLeft = mEnd != UNDEFINED ? mEnd : mExplicitLeft;
     81                 mRight = mStart != UNDEFINED ? mStart : mExplicitRight;
     82             } else {
     83                 mLeft = mStart != UNDEFINED ? mStart : mExplicitLeft;
     84                 mRight = mEnd != UNDEFINED ? mEnd : mExplicitRight;
     85             }
     86         } else {
     87             mLeft = mExplicitLeft;
     88             mRight = mExplicitRight;
     89         }
     90     }
     91 }
     92