Home | History | Annotate | Download | only in launcher3 
      1 package com.android.launcher3;
      2 
      3 import android.content.Context;
      4 import android.content.res.TypedArray;
      5 import android.graphics.Rect;
      6 import android.util.AttributeSet;
      7 import android.view.View;
      8 import android.view.ViewGroup;
      9 import android.widget.FrameLayout;
     10 
     11 public class InsettableFrameLayout extends FrameLayout implements
     12     ViewGroup.OnHierarchyChangeListener, Insettable {
     13 
     14     protected Rect mInsets = new Rect();
     15 
     16     public InsettableFrameLayout(Context context, AttributeSet attrs) {
     17         super(context, attrs);
     18         setOnHierarchyChangeListener(this);
     19     }
     20 
     21     public void setFrameLayoutChildInsets(View child, Rect newInsets, Rect oldInsets) {
     22         final LayoutParams lp = (LayoutParams) child.getLayoutParams();
     23 
     24         if (child instanceof Insettable) {
     25             ((Insettable) child).setInsets(newInsets);
     26         } else if (!lp.ignoreInsets) {
     27             lp.topMargin += (newInsets.top - oldInsets.top);
     28             lp.leftMargin += (newInsets.left - oldInsets.left);
     29             lp.rightMargin += (newInsets.right - oldInsets.right);
     30             lp.bottomMargin += (newInsets.bottom - oldInsets.bottom);
     31         }
     32         child.setLayoutParams(lp);
     33     }
     34 
     35     @Override
     36     public void setInsets(Rect insets) {
     37         final int n = getChildCount();
     38         for (int i = 0; i < n; i++) {
     39             final View child = getChildAt(i);
     40             setFrameLayoutChildInsets(child, insets, mInsets);
     41         }
     42         mInsets.set(insets);
     43     }
     44 
     45     @Override
     46     public LayoutParams generateLayoutParams(AttributeSet attrs) {
     47         return new InsettableFrameLayout.LayoutParams(getContext(), attrs);
     48     }
     49 
     50     @Override
     51     protected LayoutParams generateDefaultLayoutParams() {
     52         return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
     53     }
     54 
     55     // Override to allow type-checking of LayoutParams.
     56     @Override
     57     protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
     58         return p instanceof InsettableFrameLayout.LayoutParams;
     59     }
     60 
     61     @Override
     62     protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
     63         return new LayoutParams(p);
     64     }
     65 
     66     public static class LayoutParams extends FrameLayout.LayoutParams {
     67         boolean ignoreInsets = false;
     68 
     69         public LayoutParams(Context c, AttributeSet attrs) {
     70             super(c, attrs);
     71             TypedArray a = c.obtainStyledAttributes(attrs,
     72                     R.styleable.InsettableFrameLayout_Layout);
     73             ignoreInsets = a.getBoolean(
     74                     R.styleable.InsettableFrameLayout_Layout_layout_ignoreInsets, false);
     75             a.recycle();
     76         }
     77 
     78         public LayoutParams(int width, int height) {
     79             super(width, height);
     80         }
     81 
     82         public LayoutParams(ViewGroup.LayoutParams lp) {
     83             super(lp);
     84         }
     85     }
     86 
     87     @Override
     88     public void onChildViewAdded(View parent, View child) {
     89         setFrameLayoutChildInsets(child, mInsets, new Rect());
     90     }
     91 
     92     @Override
     93     public void onChildViewRemoved(View parent, View child) {
     94     }
     95 
     96 }
     97