| /* |
| * Copyright (C) 2009 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.camera; |
| |
| import com.android.gallery.R; |
| |
| import android.app.Activity; |
| import android.content.Context; |
| import android.util.AttributeSet; |
| import android.util.DisplayMetrics; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.ImageView; |
| import android.widget.FrameLayout; |
| |
| public class PreviewFrameLayout extends ViewGroup { |
| private static final int MIN_HORIZONTAL_MARGIN = 10; // 10dp |
| |
| public interface OnSizeChangedListener { |
| public void onSizeChanged(); |
| } |
| |
| private double mAspectRatio = 4.0 / 3.0; |
| private ImageView mGripper; |
| private FrameLayout mFrame; |
| private OnSizeChangedListener mSizeListener; |
| private DisplayMetrics mMetrics = new DisplayMetrics(); |
| |
| public PreviewFrameLayout(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| ((Activity) context).getWindowManager() |
| .getDefaultDisplay().getMetrics(mMetrics); |
| } |
| |
| public void setOnSizeChangedListener(OnSizeChangedListener listener) { |
| mSizeListener = listener; |
| } |
| |
| @Override |
| protected void onFinishInflate() { |
| mGripper = (ImageView) findViewById(R.id.btn_gripper); |
| mFrame = (FrameLayout) findViewById(R.id.frame); |
| if (mFrame == null) { |
| throw new IllegalStateException( |
| "must provide child with id as \"frame\""); |
| } |
| } |
| |
| public void setAspectRatio(double ratio) { |
| if (ratio <= 0.0) throw new IllegalArgumentException(); |
| |
| if (mAspectRatio != ratio) { |
| mAspectRatio = ratio; |
| requestLayout(); |
| } |
| } |
| |
| @Override |
| protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
| |
| int gripperWidth = 0; |
| int gripperHeight = 0; |
| |
| if (mGripper != null) { |
| measureChild(mGripper, widthMeasureSpec, heightMeasureSpec); |
| gripperWidth = mGripper.getMeasuredWidth(); |
| gripperHeight = mGripper.getMeasuredHeight(); |
| } |
| |
| int frameWidth = getMeasuredWidth() - (int) Math.max( |
| gripperWidth, MIN_HORIZONTAL_MARGIN * mMetrics.density); |
| int frameHeight = getMeasuredHeight(); |
| |
| FrameLayout f = mFrame; |
| |
| int horizontalPadding = f.getPaddingLeft() + f.getPaddingRight(); |
| int verticalPadding = f.getPaddingBottom() + f.getPaddingTop(); |
| |
| int previewWidth = frameWidth - horizontalPadding; |
| int previewHeight = frameHeight - verticalPadding; |
| |
| // resize frame and preview for aspect ratio |
| if (previewWidth > previewHeight * mAspectRatio) { |
| previewWidth = (int) (previewHeight * mAspectRatio + .5); |
| } else { |
| previewHeight = (int) (previewWidth / mAspectRatio + .5); |
| } |
| frameWidth = previewWidth + horizontalPadding; |
| frameHeight = previewHeight + verticalPadding; |
| |
| measureChild(mFrame, |
| MeasureSpec.makeMeasureSpec(MeasureSpec.EXACTLY, frameWidth), |
| MeasureSpec.makeMeasureSpec(MeasureSpec.EXACTLY, frameHeight)); |
| } |
| |
| @Override |
| protected void onLayout(boolean changed, int l, int t, int r, int b) { |
| // Try to layout the "frame" in the center of the area, and put |
| // "gripper" just to the left of it. If there is no enough space for |
| // the gripper, the "frame" will be moved a little right so that |
| // they won't overlap with each other. |
| |
| int frameWidth = mFrame.getMeasuredWidth(); |
| int frameHeight = mFrame.getMeasuredHeight(); |
| |
| int leftSpace = ((r - l) - frameWidth) / 2; |
| int topSpace = ((b - t) - frameHeight) / 2; |
| |
| int gripperWidth = 0; |
| int gripperHeight = 0; |
| if (mGripper != null) { |
| gripperWidth = mGripper.getMeasuredWidth(); |
| gripperHeight = mGripper.getMeasuredHeight(); |
| myLayoutChild(mGripper, |
| Math.max(l, l + (leftSpace - gripperWidth)), |
| t + ((b - t) - gripperHeight) / 2, |
| gripperWidth, gripperHeight); |
| } |
| myLayoutChild(mFrame, Math.max(l + leftSpace, l + gripperWidth), |
| t + topSpace, frameWidth, frameHeight); |
| if (mSizeListener != null) { |
| mSizeListener.onSizeChanged(); |
| } |
| } |
| |
| private static void myLayoutChild(View child, int l, int t, int w, int h) { |
| child.layout(l, t, l + w, t + h); |
| } |
| } |
| |