src/com/android/camera/ui/ControlPanelLayout.java

/*
 * Copyright (C) 2011 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.ui;

import android.app.Activity;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.RelativeLayout;

/**
 * A layout which handles the the width of the control panel, which contains
 * the shutter button, thumbnail, front/back camera picker, and mode picker.
 * The purpose of this is to have a consistent width of control panel in camera,
 * camcorder, and panorama modes.
 */
public class ControlPanelLayout extends RelativeLayout {
    private static final String TAG = "ControlPanelLayout";

    public ControlPanelLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onMeasure(int widthSpec, int heightSpec) {
        int widthSpecSize = MeasureSpec.getSize(widthSpec);
        int heightSpecSize = MeasureSpec.getSize(heightSpec);
        int measuredSize = 0;
        int mode, longSideSize, shortSideSize, specSize;

        boolean isLandscape = (((Activity) getContext()).getRequestedOrientation()
                == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

        if (isLandscape) {
            mode = MeasureSpec.getMode(widthSpec);
            longSideSize = widthSpecSize;
            shortSideSize = heightSpecSize;
            specSize = widthSpecSize;
        } else {
            mode = MeasureSpec.getMode(heightSpec);
            longSideSize = heightSpecSize;
            shortSideSize = widthSpecSize;
            specSize = heightSpecSize;
        }

        if (widthSpecSize > 0 && heightSpecSize > 0 && mode == MeasureSpec.AT_MOST) {
            // Calculate how big 4:3 preview occupies. Then deduct it from the
            // width of the parent.
            measuredSize = (int) (longSideSize - shortSideSize / 3.0 * 4.0);
        } else {
            Log.e(TAG, "layout_xxx of ControlPanelLayout should be wrap_content");
        }

        // The size cannot be smaller than minimum constraint.
        int minimumSize = (isLandscape) ? getMinimumWidth() : getMinimumHeight();
        if (measuredSize < minimumSize) {
            measuredSize = minimumSize;
        }

        // The size cannot be bigger than the constraint.
        if (mode == MeasureSpec.AT_MOST && measuredSize > specSize) {
            measuredSize = specSize;
        }

        if (isLandscape) {
            widthSpec = MeasureSpec.makeMeasureSpec(measuredSize, MeasureSpec.EXACTLY);
        } else {
            heightSpec = MeasureSpec.makeMeasureSpec(measuredSize, MeasureSpec.EXACTLY);
        }

        super.onMeasure(widthSpec, heightSpec);
    }
}