89 lines
2.9 KiB
Java
89 lines
2.9 KiB
Java
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.camera;
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import com.android.camera.R;
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import android.app.Activity;
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import android.content.Context;
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import android.content.pm.ActivityInfo;
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import android.view.View;
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import android.util.AttributeSet;
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import android.widget.RelativeLayout;
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/**
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* A layout which handles the preview aspect ratio.
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*/
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public class PreviewFrameLayout extends RelativeLayout {
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/** A callback to be invoked when the preview frame's size changes. */
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public interface OnSizeChangedListener {
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public void onSizeChanged();
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}
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private double mAspectRatio;
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public PreviewFrameLayout(Context context, AttributeSet attrs) {
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super(context, attrs);
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setAspectRatio(4.0 / 3.0);
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}
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public void setAspectRatio(double ratio) {
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if (ratio <= 0.0) throw new IllegalArgumentException();
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if (((Activity) getContext()).getRequestedOrientation()
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== ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) {
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ratio = 1 / ratio;
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}
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if (mAspectRatio != ratio) {
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mAspectRatio = ratio;
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requestLayout();
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}
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}
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public void showBorder(boolean enabled) {
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findViewById(R.id.preview_border).setVisibility(
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enabled ? View.VISIBLE : View.INVISIBLE);
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}
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@Override
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protected void onMeasure(int widthSpec, int heightSpec) {
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int previewWidth = MeasureSpec.getSize(widthSpec);
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int previewHeight = MeasureSpec.getSize(heightSpec);
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// Get the padding of the border background.
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int hPadding = mPaddingLeft + mPaddingRight;
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int vPadding = mPaddingTop + mPaddingBottom;
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// Resize the preview frame with correct aspect ratio.
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previewWidth -= hPadding;
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previewHeight -= vPadding;
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if (previewWidth > previewHeight * mAspectRatio) {
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previewWidth = (int) (previewHeight * mAspectRatio + .5);
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} else {
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previewHeight = (int) (previewWidth / mAspectRatio + .5);
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}
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// Add the padding of the border.
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previewWidth += hPadding;
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previewHeight += vPadding;
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// Ask children to follow the new preview dimension.
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super.onMeasure(MeasureSpec.makeMeasureSpec(previewWidth, MeasureSpec.EXACTLY),
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MeasureSpec.makeMeasureSpec(previewHeight, MeasureSpec.EXACTLY));
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}
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}
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