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 CandidateViewContainer(Context screen, AttributeSet attrs)34 public CandidateViewContainer(Context screen, AttributeSet attrs) { 35 super(screen, attrs); 36 } 37 initViews()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 requestLayout()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