1 /* 2 * Copyright (C) 2008 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 package com.android.calculator2; 18 19 import android.view.animation.TranslateAnimation; 20 import android.view.MotionEvent; 21 import android.view.View; 22 import android.view.GestureDetector; 23 import android.widget.FrameLayout; 24 import android.content.Context; 25 import android.util.AttributeSet; 26 import android.os.Handler; 27 28 import java.util.Map; 29 30 class PanelSwitcher extends FrameLayout { 31 private static final int MAJOR_MOVE = 60; 32 private static final int ANIM_DURATION = 400; 33 34 private GestureDetector mGestureDetector; 35 private int mCurrentView; 36 private View mChild, mHistoryView; 37 private View children[]; 38 39 private int mWidth; 40 private TranslateAnimation inLeft; 41 private TranslateAnimation outLeft; 42 43 private TranslateAnimation inRight; 44 private TranslateAnimation outRight; 45 46 private static final int NONE = 1; 47 private static final int LEFT = 2; 48 private static final int RIGHT = 3; 49 private int mPreviousMove; 50 PanelSwitcher(Context context, AttributeSet attrs)51 public PanelSwitcher(Context context, AttributeSet attrs) { 52 super(context, attrs); 53 mCurrentView = 0; 54 mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() { 55 public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, 56 float velocityY) { 57 int dx = (int) (e2.getX() - e1.getX()); 58 59 // don't accept the fling if it's too short 60 // as it may conflict with a button push 61 if (Math.abs(dx) > MAJOR_MOVE && Math.abs(velocityX) > Math.abs(velocityY)) { 62 if (velocityX > 0) { 63 moveRight(); 64 } else { 65 moveLeft(); 66 } 67 return true; 68 } else { 69 return false; 70 } 71 } 72 }); 73 } 74 75 @Override onSizeChanged(int w, int h, int oldW, int oldH)76 public void onSizeChanged(int w, int h, int oldW, int oldH) { 77 mWidth = w; 78 inLeft = new TranslateAnimation(mWidth, 0, 0, 0); 79 outLeft = new TranslateAnimation(0, -mWidth, 0, 0); 80 inRight = new TranslateAnimation(-mWidth, 0, 0, 0); 81 outRight = new TranslateAnimation(0, mWidth, 0, 0); 82 83 inLeft.setDuration(ANIM_DURATION); 84 outLeft.setDuration(ANIM_DURATION); 85 inRight.setDuration(ANIM_DURATION); 86 outRight.setDuration(ANIM_DURATION); 87 } 88 onFinishInflate()89 protected void onFinishInflate() { 90 int count = getChildCount(); 91 children = new View[count]; 92 for (int i = 0; i < count; ++i) { 93 children[i] = getChildAt(i); 94 if (i != mCurrentView) { 95 children[i].setVisibility(View.GONE); 96 } 97 } 98 } 99 100 @Override onTouchEvent(MotionEvent event)101 public boolean onTouchEvent(MotionEvent event) { 102 mGestureDetector.onTouchEvent(event); 103 return true; 104 } 105 106 @Override onInterceptTouchEvent(MotionEvent event)107 public boolean onInterceptTouchEvent(MotionEvent event) { 108 return mGestureDetector.onTouchEvent(event); 109 } 110 moveLeft()111 void moveLeft() { 112 // <-- 113 if (mCurrentView < children.length - 1 && mPreviousMove != LEFT) { 114 children[mCurrentView+1].setVisibility(View.VISIBLE); 115 children[mCurrentView+1].startAnimation(inLeft); 116 children[mCurrentView].startAnimation(outLeft); 117 children[mCurrentView].setVisibility(View.GONE); 118 119 mCurrentView++; 120 mPreviousMove = LEFT; 121 } 122 } 123 moveRight()124 void moveRight() { 125 // --> 126 if (mCurrentView > 0 && mPreviousMove != RIGHT) { 127 children[mCurrentView-1].setVisibility(View.VISIBLE); 128 children[mCurrentView-1].startAnimation(inRight); 129 children[mCurrentView].startAnimation(outRight); 130 children[mCurrentView].setVisibility(View.GONE); 131 132 mCurrentView--; 133 mPreviousMove = RIGHT; 134 } 135 } 136 getCurrentIndex()137 int getCurrentIndex() { 138 return mCurrentView; 139 } 140 } 141