PreviewFrameLayout.java revision da705aa1c8cbaaba105d9bc7799aef95c416a459
1ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin/* 2ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin * Copyright (C) 2009 The Android Open Source Project 3ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin * 4ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin * Licensed under the Apache License, Version 2.0 (the "License"); 5ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin * you may not use this file except in compliance with the License. 6ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin * You may obtain a copy of the License at 7ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin * 8ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin * http://www.apache.org/licenses/LICENSE-2.0 9ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin * 10ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin * Unless required by applicable law or agreed to in writing, software 11ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin * distributed under the License is distributed on an "AS IS" BASIS, 12ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin * See the License for the specific language governing permissions and 14ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin * limitations under the License. 15ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin */ 16ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin 17ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Linpackage com.android.camera; 18ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin 19da705aa1c8cbaaba105d9bc7799aef95c416a459Chih-Chung Changimport com.android.camera.R; 20da705aa1c8cbaaba105d9bc7799aef95c416a459Chih-Chung Chang 214c7b291018e08dbb4bc1712d95117a294fa1416cWu-cheng Liimport android.app.Activity; 22ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Linimport android.content.Context; 234c7b291018e08dbb4bc1712d95117a294fa1416cWu-cheng Liimport android.content.pm.ActivityInfo; 24da705aa1c8cbaaba105d9bc7799aef95c416a459Chih-Chung Changimport android.view.View; 25ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Linimport android.util.AttributeSet; 2659ddc8c1add2fcffe523e3877baad1b6cc5ba2fbChung-yih Wangimport android.widget.RelativeLayout; 27271b3095b9f763421c0547109da9de774795072dChih-Chung Chang/** 2802ec7c0880ded5863d73d6f173ef35ab5c888dcdWu-cheng Li * A layout which handles the preview aspect ratio. 29271b3095b9f763421c0547109da9de774795072dChih-Chung Chang */ 3059ddc8c1add2fcffe523e3877baad1b6cc5ba2fbChung-yih Wangpublic class PreviewFrameLayout extends RelativeLayout { 31271b3095b9f763421c0547109da9de774795072dChih-Chung Chang /** A callback to be invoked when the preview frame's size changes. */ 321f0564eb75f20943d496109928b5542902d3bd61Wei-Ta Chen public interface OnSizeChangedListener { 331f0564eb75f20943d496109928b5542902d3bd61Wei-Ta Chen public void onSizeChanged(); 341f0564eb75f20943d496109928b5542902d3bd61Wei-Ta Chen } 351f0564eb75f20943d496109928b5542902d3bd61Wei-Ta Chen 364c7b291018e08dbb4bc1712d95117a294fa1416cWu-cheng Li private double mAspectRatio; 376988d4e2ef8d14d8bf3ee81c8eb3175bbf1b88ecOwen Lin 38ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin public PreviewFrameLayout(Context context, AttributeSet attrs) { 39ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin super(context, attrs); 404c7b291018e08dbb4bc1712d95117a294fa1416cWu-cheng Li setAspectRatio(4.0 / 3.0); 41ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin } 42ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin 43ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin public void setAspectRatio(double ratio) { 44ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin if (ratio <= 0.0) throw new IllegalArgumentException(); 454c7b291018e08dbb4bc1712d95117a294fa1416cWu-cheng Li 464c7b291018e08dbb4bc1712d95117a294fa1416cWu-cheng Li if (((Activity) getContext()).getRequestedOrientation() 474c7b291018e08dbb4bc1712d95117a294fa1416cWu-cheng Li == ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) { 484c7b291018e08dbb4bc1712d95117a294fa1416cWu-cheng Li ratio = 1 / ratio; 494c7b291018e08dbb4bc1712d95117a294fa1416cWu-cheng Li } 504c7b291018e08dbb4bc1712d95117a294fa1416cWu-cheng Li 51ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin if (mAspectRatio != ratio) { 52ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin mAspectRatio = ratio; 53ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin requestLayout(); 54ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin } 55ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin } 56ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin 57db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang public void showBorder(boolean enabled) { 58da705aa1c8cbaaba105d9bc7799aef95c416a459Chih-Chung Chang findViewById(R.id.preview_border).setVisibility( 59da705aa1c8cbaaba105d9bc7799aef95c416a459Chih-Chung Chang enabled ? View.VISIBLE : View.INVISIBLE); 60db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang } 61db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang 62ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin @Override 63db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang protected void onMeasure(int widthSpec, int heightSpec) { 64db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang int previewWidth = MeasureSpec.getSize(widthSpec); 65db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang int previewHeight = MeasureSpec.getSize(heightSpec); 66db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang 67db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang // Get the padding of the border background. 68db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang int hPadding = mPaddingLeft + mPaddingRight; 69db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang int vPadding = mPaddingTop + mPaddingBottom; 70db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang 71db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang // Resize the preview frame with correct aspect ratio. 72db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang previewWidth -= hPadding; 73db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang previewHeight -= vPadding; 74ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin if (previewWidth > previewHeight * mAspectRatio) { 75ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin previewWidth = (int) (previewHeight * mAspectRatio + .5); 76ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin } else { 77ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin previewHeight = (int) (previewWidth / mAspectRatio + .5); 78ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin } 796988d4e2ef8d14d8bf3ee81c8eb3175bbf1b88ecOwen Lin 80db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang // Add the padding of the border. 81db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang previewWidth += hPadding; 82db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang previewHeight += vPadding; 83940b813c57c6c6eb66f55d968c9cb2b28e79b24bWu-cheng Li 84db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang // Ask children to follow the new preview dimension. 85db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang super.onMeasure(MeasureSpec.makeMeasureSpec(previewWidth, MeasureSpec.EXACTLY), 86db3556078a75be0bd4a08195d90f060724034e88Chung-yih Wang MeasureSpec.makeMeasureSpec(previewHeight, MeasureSpec.EXACTLY)); 87ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin } 88ffcca7403c9a364403357d3c76a3ff256c63c786Cheng-Ru Lin} 89