/*
Copyright © 2013-2014, Silent Circle, LLC.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Any redistribution, use, or modification is done solely for personal
benefit and not for any commercial purpose or for monetary gain
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name Silent Circle nor the names of its contributors may
be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL SILENT CIRCLE, LLC BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This implementation is edited version of original Android sources.
*/
/*
* 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.silentcircle.contacts.widget;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import com.silentcircle.contacts.R;
/**
* Layout that calculates its height based on its width, or vice versa (depending on the set
* {@link #setDirection(Direction)}. The factor is specified in {@link #setRatio(float)}.
* <p>For {@link Direction#heightToWidth}: width := height * factor</p>
* <p>For {@link Direction#widthToHeight}: height := width * factor</p>
* <p>Only one child is allowed; if more are required, another ViewGroup can be used as the direct
* child of this layout.</p>
*/
public class ProportionalLayout extends ViewGroup {
/** Specifies whether the width should be calculated based on the height or vice-versa */
public enum Direction {
widthToHeight("widthToHeight"),
heightToWidth("heightToWidth");
public final String XmlName;
private Direction(String xmlName) {
XmlName = xmlName;
}
/**
* Parses the given direction string and returns the Direction instance. This
* should be used when inflating from xml
*/
public static Direction parse(String value) {
if (widthToHeight.XmlName.equals(value)) {
return Direction.widthToHeight;
} else if (heightToWidth.XmlName.equals(value)) {
return Direction.heightToWidth;
} else {
throw new IllegalStateException("direction must be either " +
widthToHeight.XmlName + " or " + heightToWidth.XmlName);
}
}
}
private Direction mDirection;
private float mRatio;
public ProportionalLayout(Context context) {
super(context);
}
public ProportionalLayout(Context context, AttributeSet attrs) {
super(context, attrs);
initFromAttributes(context, attrs);
}
public ProportionalLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initFromAttributes(context, attrs);
}
private void initFromAttributes(Context context, AttributeSet attrs) {
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ProportionalLayout);
mDirection = Direction.parse(a.getString(R.styleable.ProportionalLayout_direction));
mRatio = a.getFloat(R.styleable.ProportionalLayout_ratio, 1.0f);
a.recycle();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (getChildCount() != 1) {
throw new IllegalStateException("ProportionalLayout requires exactly one child");
}
final View child = getChildAt(0);
// Do a first pass to get the optimal size
measureChild(child, widthMeasureSpec, heightMeasureSpec);
final int childWidth = child.getMeasuredWidth();
final int childHeight = child.getMeasuredHeight();
final int width;
final int height;
if (mDirection == Direction.heightToWidth) {
width = Math.round(childHeight * mRatio);
height = childHeight;
} else {
width = childWidth;
height = Math.round(childWidth * mRatio);
}
// Do a second pass so that all children are informed of the new size
measureChild(child,
MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));
setMeasuredDimension(
resolveSize(width, widthMeasureSpec), resolveSize(height, heightMeasureSpec));
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
if (getChildCount() != 1) {
throw new IllegalStateException("ProportionalLayout requires exactly one child");
}
final View child = getChildAt(0);
child.layout(0, 0, right-left, bottom-top);
}
public Direction getDirection() {
return mDirection;
}
public void setDirection(Direction direction) {
mDirection = direction;
}
public float getRatio() {
return mRatio;
}
public void setRatio(float ratio) {
mRatio = ratio;
}
}