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/*
* Copyright (C) 2013 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.example.android.expandingcells;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.RelativeLayout;
/**
* This layout is used to contain the extra information that will be displayed
* when a certain cell is expanded. The custom relative layout is created in
* order to achieve a fading affect of this layout's contents as it is being
* expanded or collapsed as opposed to just fading the content in(out) after(before)
* the cell expands(collapses).
*
* During expansion, layout takes place so the full contents of this layout can
* be displayed. When the size changes to display the full contents of the layout,
* its height is stored. When the view is collapsing, this layout's height becomes 0
* since it is no longer in the visible part of the cell.By overriding onMeasure, and
* setting the height back to its max height, it is still visible during the collapse
* animation, and so, a fade out effect can be achieved.
*/
public class ExpandingLayout extends RelativeLayout {
private OnSizeChangedListener mSizeChangedListener;
private int mExpandedHeight = -1;
public ExpandingLayout(Context context) {
super(context);
}
public ExpandingLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ExpandingLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
protected void onMeasure (int widthMeasureSpec, int heightMeasureSpec) {
if (mExpandedHeight > 0) {
heightMeasureSpec = MeasureSpec.makeMeasureSpec(mExpandedHeight, MeasureSpec.AT_MOST);
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
protected void onSizeChanged (int w, int h, int oldw, int oldh) {
mExpandedHeight = h;
//Notifies the list data object corresponding to this layout that its size has changed.
mSizeChangedListener.onSizeChanged(h);
}
public int getExpandedHeight() {
return mExpandedHeight;
}
public void setExpandedHeight(int expandedHeight) {
mExpandedHeight = expandedHeight;
}
public void setSizeChangedListener(OnSizeChangedListener listener) {
mSizeChangedListener = listener;
}
}
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