1 /* 2 * Copyright (C) 2013 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 android.graphics.RectF; 20 import android.view.GestureDetector; 21 import android.view.TextureView; 22 import android.view.View; 23 24 /** 25 * This interface defines a listener that watches preview status, including SurfaceTexture 26 * change and preview gestures. 27 */ 28 public interface PreviewStatusListener extends TextureView.SurfaceTextureListener { 29 /** 30 * The preview status listener needs to provide an 31 * {@link android.view.GestureDetector.OnGestureListener} in order to listen 32 * to the touch events that happen on preview. 33 * 34 * @return a listener that listens to touch events 35 */ 36 public GestureDetector.OnGestureListener getGestureListener(); 37 38 /** 39 * An {@link android.view.View.OnTouchListener} can be provided in addition to 40 * or instead of a {@link android.view.GestureDetector.OnGestureListener} 41 * for listening to touch events on the preview. The listener is called whenever 42 * there is a touch event on the {@link com.android.camera.ui.PreviewOverlay}. 43 */ 44 public View.OnTouchListener getTouchListener(); 45 46 /** 47 * Gets called when preview TextureView gets a layout change call. 48 */ 49 public void onPreviewLayoutChanged(View v, int left, int top, int right, 50 int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom); 51 52 /** 53 * This listener gets notified when the actual preview frame changes due 54 * to a transform matrix being applied to the TextureView 55 */ 56 public interface PreviewAreaChangedListener { 57 public void onPreviewAreaChanged(RectF previewArea); 58 } 59 60 /** 61 * The preview status listener needs to know for the specific module whether 62 * preview TextureView should automatically adjust its transform matrix based 63 * on the current aspect ratio, width and height of the TextureView. 64 * 65 * @return whether transform matrix should be automatically adjusted 66 */ 67 public boolean shouldAutoAdjustTransformMatrixOnLayout(); 68 69 /** 70 * Gets called when the preview is flipped (i.e. 180-degree rotated). 71 */ 72 public void onPreviewFlipped(); 73 74 /** 75 * This listener gets notified when the preview aspect ratio is changed. 76 */ 77 public interface PreviewAspectRatioChangedListener { 78 public void onPreviewAspectRatioChanged(float aspectRatio); 79 } 80 } 81