/*
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.
*/
/*
* Copyright (C) 2010 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.graphics.Rect;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import com.silentcircle.contacts.R;
/**
* Layout similar to LinearLayout that allows a child to specify examples of
* desired size depending on the parent size. For example if the widget wants to
* be 100dip when parent is 200dip and 110dip when parent is 400dip, the layout
* will ensure these requirements and interpolate for other parent sizes.
* You can also specify minWidth for each child. You can have at most one
* child with layout_width="match_parent" - it will take the entire remaining
* space.
*/
public class InterpolatingLayout extends ViewGroup {
private Rect mInRect = new Rect();
private Rect mOutRect = new Rect();
public InterpolatingLayout(Context context) {
super(context);
}
public InterpolatingLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public InterpolatingLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public final static class LayoutParams extends LinearLayout.LayoutParams {
public int narrowParentWidth;
public int narrowWidth;
public int narrowMarginLeft;
public int narrowPaddingLeft;
public int narrowMarginRight;
public int narrowPaddingRight;
public int wideParentWidth;
public int wideWidth;
public int wideMarginLeft;
public int widePaddingLeft;
public int wideMarginRight;
public int widePaddingRight;
private float widthMultiplier;
private int widthConstant;
private float leftMarginMultiplier;
private int leftMarginConstant;
private float leftPaddingMultiplier;
private int leftPaddingConstant;
private float rightMarginMultiplier;
private int rightMarginConstant;
private float rightPaddingMultiplier;
private int rightPaddingConstant;
public LayoutParams(Context c, AttributeSet attrs) {
super(c, attrs);
TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.InterpolatingLayout_Layout);
narrowParentWidth = a.getDimensionPixelSize(
R.styleable.InterpolatingLayout_Layout_layout_narrowParentWidth, -1);
narrowWidth = a.getDimensionPixelSize(
R.styleable.InterpolatingLayout_Layout_layout_narrowWidth, -1);
narrowMarginLeft = a.getDimensionPixelSize(
R.styleable.InterpolatingLayout_Layout_layout_narrowMarginLeft, -1);
narrowPaddingLeft = a.getDimensionPixelSize(
R.styleable.InterpolatingLayout_Layout_layout_narrowPaddingLeft, -1);
narrowMarginRight = a.getDimensionPixelSize(
R.styleable.InterpolatingLayout_Layout_layout_narrowMarginRight, -1);
narrowPaddingRight = a.getDimensionPixelSize(
R.styleable.InterpolatingLayout_Layout_layout_narrowPaddingRight, -1);
wideParentWidth = a.getDimensionPixelSize(
R.styleable.InterpolatingLayout_Layout_layout_wideParentWidth, -1);
wideWidth = a.getDimensionPixelSize(
R.styleable.InterpolatingLayout_Layout_layout_wideWidth, -1);
wideMarginLeft = a.getDimensionPixelSize(
R.styleable.InterpolatingLayout_Layout_layout_wideMarginLeft, -1);
widePaddingLeft = a.getDimensionPixelSize(
R.styleable.InterpolatingLayout_Layout_layout_widePaddingLeft, -1);
wideMarginRight = a.getDimensionPixelSize(
R.styleable.InterpolatingLayout_Layout_layout_wideMarginRight, -1);
widePaddingRight = a.getDimensionPixelSize(
R.styleable.InterpolatingLayout_Layout_layout_widePaddingRight, -1);
a.recycle();
if (narrowWidth != -1) {
widthMultiplier = (float) (wideWidth - narrowWidth)
/ (wideParentWidth - narrowParentWidth);
widthConstant = (int) (narrowWidth - narrowParentWidth * widthMultiplier);
}
if (narrowMarginLeft != -1) {
leftMarginMultiplier = (float) (wideMarginLeft - narrowMarginLeft)
/ (wideParentWidth - narrowParentWidth);
leftMarginConstant = (int) (narrowMarginLeft - narrowParentWidth
* leftMarginMultiplier);
}
if (narrowPaddingLeft != -1) {
leftPaddingMultiplier = (float) (widePaddingLeft - narrowPaddingLeft)
/ (wideParentWidth - narrowParentWidth);
leftPaddingConstant = (int) (narrowPaddingLeft - narrowParentWidth
* leftPaddingMultiplier);
}
if (narrowMarginRight != -1) {
rightMarginMultiplier = (float) (wideMarginRight - narrowMarginRight)
/ (wideParentWidth - narrowParentWidth);
rightMarginConstant = (int) (narrowMarginRight - narrowParentWidth
* rightMarginMultiplier);
}
if (narrowPaddingRight != -1) {
rightPaddingMultiplier = (float) (widePaddingRight - narrowPaddingRight)
/ (wideParentWidth - narrowParentWidth);
rightPaddingConstant = (int) (narrowPaddingRight - narrowParentWidth
* rightPaddingMultiplier);
}
}
public LayoutParams(int width, int height) {
super(width, height);
}
public LayoutParams(MarginLayoutParams source) {
super(source);
}
public int resolveWidth(int parentSize) {
if (narrowWidth == -1) {
return width;
} else {
int w = (int) (parentSize * widthMultiplier) + widthConstant;
return w <= 0 ? WRAP_CONTENT : w;
}
}
public int resolveLeftMargin(int parentSize) {
if (narrowMarginLeft == -1) {
return leftMargin;
} else {
int w = (int) (parentSize * leftMarginMultiplier) + leftMarginConstant;
return w < 0 ? 0 : w;
}
}
public int resolveLeftPadding(int parentSize) {
int w = (int) (parentSize * leftPaddingMultiplier) + leftPaddingConstant;
return w < 0 ? 0 : w;
}
public int resolveRightMargin(int parentSize) {
if (narrowMarginRight == -1) {
return rightMargin;
} else {
int w = (int) (parentSize * rightMarginMultiplier) + rightMarginConstant;
return w < 0 ? 0 : w;
}
}
public int resolveRightPadding(int parentSize) {
int w = (int) (parentSize * rightPaddingMultiplier) + rightPaddingConstant;
return w < 0 ? 0 : w;
}
}
@Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new LayoutParams(getContext(), attrs);
}
@Override
protected LayoutParams generateDefaultLayoutParams() {
return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
int parentHeight = MeasureSpec.getSize(heightMeasureSpec);
int width = 0;
int height = 0;
View fillChild = null;
int count = getChildCount();
for (int i = 0; i < count; i++) {
View child = getChildAt(i);
if (child.getVisibility() == View.GONE) {
continue;
}
LayoutParams params = (LayoutParams) child.getLayoutParams();
if (params.width == LayoutParams.MATCH_PARENT) {
if (fillChild != null) {
throw new RuntimeException(
"Interpolating layout allows at most one child"
+ " with layout_width='match_parent'");
}
fillChild = child;
} else {
int childWidth = params.resolveWidth(parentWidth);
int childWidthMeasureSpec;
switch (childWidth) {
case LayoutParams.WRAP_CONTENT:
childWidthMeasureSpec = MeasureSpec.UNSPECIFIED;
break;
default:
childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(
childWidth, MeasureSpec.EXACTLY);
break;
}
int childHeightMeasureSpec;
switch (params.height) {
case LayoutParams.WRAP_CONTENT:
childHeightMeasureSpec = MeasureSpec.UNSPECIFIED;
break;
case LayoutParams.MATCH_PARENT:
childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(
parentHeight - params.topMargin - params.bottomMargin,
MeasureSpec.EXACTLY);
break;
default:
childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(
params.height, MeasureSpec.EXACTLY);
break;
}
child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
width += child.getMeasuredWidth();
height = Math.max(child.getMeasuredHeight(), height);
}
width += params.resolveLeftMargin(parentWidth) + params.resolveRightMargin(parentWidth);
}
if (fillChild != null) {
int remainder = parentWidth - width;
int childMeasureSpec = remainder > 0
? MeasureSpec.makeMeasureSpec(remainder, MeasureSpec.EXACTLY)
: MeasureSpec.UNSPECIFIED;
fillChild.measure(childMeasureSpec, heightMeasureSpec);
width += fillChild.getMeasuredWidth();
height = Math.max(fillChild.getMeasuredHeight(), height);
}
setMeasuredDimension(
resolveSize(width, widthMeasureSpec), resolveSize(height, heightMeasureSpec));
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
int offset = 0;
int width = right - left;
int count = getChildCount();
for (int i = 0; i < count; i++) {
View child = getChildAt(i);
if (child.getVisibility() == View.GONE) {
continue;
}
LayoutParams params = (LayoutParams) child.getLayoutParams();
int gravity = params.gravity;
if (gravity == -1) {
gravity = Gravity.LEFT | Gravity.TOP;
}
if (params.narrowPaddingLeft != -1 || params.narrowPaddingRight != -1) {
int leftPadding = params.narrowPaddingLeft == -1 ? child.getPaddingLeft()
: params.resolveLeftPadding(width);
int rightPadding = params.narrowPaddingRight == -1 ? child.getPaddingRight()
: params.resolveRightPadding(width);
child.setPadding(
leftPadding, child.getPaddingTop(), rightPadding, child.getPaddingBottom());
}
int leftMargin = params.resolveLeftMargin(width);
int rightMargin = params.resolveRightMargin(width);
mInRect.set(offset + leftMargin, params.topMargin,
right - rightMargin, bottom - params.bottomMargin);
Gravity.apply(gravity, child.getMeasuredWidth(), child.getMeasuredHeight(),
mInRect, mOutRect);
child.layout(mOutRect.left, mOutRect.top, mOutRect.right, mOutRect.bottom);
offset = mOutRect.right + rightMargin;
}
}
}