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      1 /*
      2  * Copyright (C) 2008-2009 Google Inc.
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
      5  * use this file except in compliance with the License. You may obtain a copy of
      6  * 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, WITHOUT
     12  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
     13  * License for the specific language governing permissions and limitations under
     14  * the License.
     15  */
     16 
     17 package com.android.inputmethod.latin;
     18 
     19 import android.content.Context;
     20 import android.util.AttributeSet;
     21 import android.view.MotionEvent;
     22 import android.view.View;
     23 import android.view.View.OnTouchListener;
     24 import android.widget.LinearLayout;
     25 
     26 public class CandidateViewContainer extends LinearLayout implements OnTouchListener {
     27 
     28     private View mButtonLeft;
     29     private View mButtonRight;
     30     private View mButtonLeftLayout;
     31     private View mButtonRightLayout;
     32     private CandidateView mCandidates;
     33 
     34     public CandidateViewContainer(Context screen, AttributeSet attrs) {
     35         super(screen, attrs);
     36     }
     37 
     38     public void initViews() {
     39         if (mCandidates == null) {
     40             mButtonLeftLayout = findViewById(R.id.candidate_left_parent);
     41             mButtonLeft = findViewById(R.id.candidate_left);
     42             if (mButtonLeft != null) {
     43                 mButtonLeft.setOnTouchListener(this);
     44             }
     45             mButtonRightLayout = findViewById(R.id.candidate_right_parent);
     46             mButtonRight = findViewById(R.id.candidate_right);
     47             if (mButtonRight != null) {
     48                 mButtonRight.setOnTouchListener(this);
     49             }
     50             mCandidates = (CandidateView) findViewById(R.id.candidates);
     51         }
     52     }
     53 
     54     @Override
     55     public void requestLayout() {
     56         if (mCandidates != null) {
     57             int availableWidth = mCandidates.getWidth();
     58             int neededWidth = mCandidates.computeHorizontalScrollRange();
     59             int x = mCandidates.getScrollX();
     60             boolean leftVisible = x > 0;
     61             boolean rightVisible = x + availableWidth < neededWidth;
     62             if (mButtonLeftLayout != null) {
     63                 mButtonLeftLayout.setVisibility(leftVisible ? VISIBLE : GONE);
     64             }
     65             if (mButtonRightLayout != null) {
     66                 mButtonRightLayout.setVisibility(rightVisible ? VISIBLE : GONE);
     67             }
     68         }
     69         super.requestLayout();
     70     }
     71 
     72     public boolean onTouch(View v, MotionEvent event) {
     73         if (event.getAction() == MotionEvent.ACTION_DOWN) {
     74             if (v == mButtonRight) {
     75                 mCandidates.scrollNext();
     76             } else if (v == mButtonLeft) {
     77                 mCandidates.scrollPrev();
     78             }
     79         }
     80         return false;
     81     }
     82 
     83 }
     84