/*
* Copyright (C) 2015 The CyanogenMod 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.launcher3;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
public class InsettableLinearLayout extends LinearLayout implements
ViewGroup.OnHierarchyChangeListener, Insettable {
protected Rect mInsets = new Rect();
public InsettableLinearLayout(Context context, AttributeSet attrs) {
super(context, attrs);
setOnHierarchyChangeListener(this);
}
public void setLinearLayoutChildInsets(View child, Rect newInsets, Rect oldInsets) {
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
if (child instanceof Insettable) {
((Insettable) child).setInsets(newInsets);
} else if (!lp.ignoreInsets) {
if (!lp.ignoreTopInsets) {
lp.topMargin += (newInsets.top - oldInsets.top);
}
lp.leftMargin += (newInsets.left - oldInsets.left);
lp.rightMargin += (newInsets.right - oldInsets.right);
if (!lp.ignoreBottomInsets) {
lp.bottomMargin += (newInsets.bottom - oldInsets.bottom);
}
}
child.setLayoutParams(lp);
}
@Override
public void setInsets(Rect insets) {
final int n = getChildCount();
for (int i = 0; i < n; i++) {
final View child = getChildAt(i);
setLinearLayoutChildInsets(child, insets, mInsets);
}
mInsets.set(insets);
}
@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 to allow type-checking of LayoutParams.
@Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
return p instanceof LayoutParams;
}
@Override
protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
return new LayoutParams(p);
}
public static class LayoutParams extends LinearLayout.LayoutParams {
boolean ignoreInsets = false;
boolean ignoreTopInsets = false;
boolean ignoreBottomInsets = false;
public LayoutParams(Context c, AttributeSet attrs) {
super(c, attrs);
TypedArray a = c.obtainStyledAttributes(attrs,
R.styleable.InsettableLinearLayout_Layout);
ignoreInsets = a.getBoolean(
R.styleable.InsettableLinearLayout_Layout_layout_ignoreInsets, false);
ignoreTopInsets = a.getBoolean(
R.styleable.InsettableLinearLayout_Layout_layout_ignoreTopInsets, false);
ignoreBottomInsets = a.getBoolean(
R.styleable.InsettableLinearLayout_Layout_layout_ignoreBottomInsets, false);
a.recycle();
}
public LayoutParams(int width, int height) {
super(width, height);
}
public LayoutParams(ViewGroup.LayoutParams lp) {
super(lp);
}
}
@Override
public void onChildViewAdded(View parent, View child) {
setLinearLayoutChildInsets(child, mInsets, new Rect());
}
@Override
public void onChildViewRemoved(View parent, View child) {
}
}