1 /* 2 * Copyright (C) 2011 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.camera.ui; 18 19 import com.android.camera.R; 20 import com.android.camera.Util; 21 22 import android.content.Context; 23 import android.util.AttributeSet; 24 import android.view.MotionEvent; 25 import android.view.View; 26 27 /** 28 * A view that contains camera zoom control and its layout. 29 */ 30 public class ZoomControlBar extends ZoomControl { 31 private static final String TAG = "ZoomControlBar"; 32 private static final int THRESHOLD_FIRST_MOVE = Util.dpToPixel(10); // pixels 33 // Space between indicator icon and the zoom-in/out icon. 34 private static final int ICON_SPACING = Util.dpToPixel(12); 35 36 private View mBar; 37 private boolean mStartChanging; 38 private int mSliderPosition = 0; 39 private int mSliderLength; 40 private int mWidth; 41 private int mIconWidth; 42 private int mTotalIconWidth; 43 44 public ZoomControlBar(Context context, AttributeSet attrs) { 45 super(context, attrs); 46 mBar = new View(context); 47 mBar.setBackgroundResource(R.drawable.zoom_slider_bar); 48 addView(mBar); 49 } 50 51 @Override 52 public void setActivated(boolean activated) { 53 super.setActivated(activated); 54 mBar.setActivated(activated); 55 } 56 57 private int getSliderPosition(int x) { 58 // Calculate the absolute offset of the slider in the zoom control bar. 59 // For left-hand users, as the device is rotated for 180 degree for 60 // landscape mode, the zoom-in bottom should be on the top, so the 61 // position should be reversed. 62 int pos; // the relative position in the zoom slider bar 63 if (mOrientation == 90) { 64 pos = mWidth - mTotalIconWidth - x; 65 } else { 66 pos = x - mTotalIconWidth; 67 } 68 if (pos < 0) pos = 0; 69 if (pos > mSliderLength) pos = mSliderLength; 70 return pos; 71 } 72 73 @Override 74 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 75 mWidth = w; 76 mIconWidth = mZoomIn.getMeasuredWidth(); 77 mTotalIconWidth = mIconWidth + ICON_SPACING; 78 mSliderLength = mWidth - (2 * mTotalIconWidth); 79 } 80 81 @Override 82 public boolean dispatchTouchEvent(MotionEvent event) { 83 if (!isEnabled() || (mWidth == 0)) return false; 84 int action = event.getAction(); 85 86 switch (action) { 87 case MotionEvent.ACTION_OUTSIDE: 88 case MotionEvent.ACTION_CANCEL: 89 case MotionEvent.ACTION_UP: 90 setActivated(false); 91 closeZoomControl(); 92 break; 93 94 case MotionEvent.ACTION_DOWN: 95 setActivated(true); 96 mStartChanging = false; 97 case MotionEvent.ACTION_MOVE: 98 int pos = getSliderPosition((int) event.getX()); 99 if (!mStartChanging) { 100 // Make sure the movement is large enough before we start 101 // changing the zoom. 102 int delta = mSliderPosition - pos; 103 if ((delta > THRESHOLD_FIRST_MOVE) || 104 (delta < -THRESHOLD_FIRST_MOVE)) { 105 mStartChanging = true; 106 } 107 } 108 if (mStartChanging) { 109 performZoom(1.0d * pos / mSliderLength); 110 mSliderPosition = pos; 111 } 112 requestLayout(); 113 } 114 return true; 115 } 116 117 @Override 118 public void setOrientation(int orientation) { 119 // layout for the left-hand camera control 120 if ((orientation == 90) || (mOrientation == 90)) requestLayout(); 121 super.setOrientation(orientation); 122 } 123 124 @Override 125 protected void onLayout( 126 boolean changed, int left, int top, int right, int bottom) { 127 if (mZoomMax == 0) return; 128 int height = bottom - top; 129 mBar.layout(mTotalIconWidth, 0, mWidth - mTotalIconWidth, height); 130 // For left-hand users, as the device is rotated for 180 degree, 131 // the zoom-in button should be on the top. 132 int pos; // slider position 133 int sliderPosition; 134 if (mSliderPosition != -1) { // -1 means invalid 135 sliderPosition = mSliderPosition; 136 } else { 137 sliderPosition = (int) ((double) mSliderLength * mZoomIndex / mZoomMax); 138 } 139 if (mOrientation == 90) { 140 mZoomIn.layout(0, 0, mIconWidth, height); 141 mZoomOut.layout(mWidth - mIconWidth, 0, mWidth, height); 142 pos = mBar.getRight() - sliderPosition; 143 } else { 144 mZoomOut.layout(0, 0, mIconWidth, height); 145 mZoomIn.layout(mWidth - mIconWidth, 0, mWidth, height); 146 pos = mBar.getLeft() + sliderPosition; 147 } 148 int sliderWidth = mZoomSlider.getMeasuredWidth(); 149 mZoomSlider.layout((pos - sliderWidth / 2), 0, 150 (pos + sliderWidth / 2), height); 151 } 152 153 @Override 154 public void setZoomIndex(int index) { 155 super.setZoomIndex(index); 156 mSliderPosition = -1; // -1 means invalid 157 requestLayout(); 158 } 159 } 160
