1 files changed, 106 insertions, 0 deletions
diff --git a/src/com/android/launcher3/InsettableLinearLayout.java b/src/com/android/launcher3/InsettableLinearLayout.java
new file mode 100644
index 000000000..c48c088cc
--- /dev/null
+++ b/src/com/android/launcher3/InsettableLinearLayout.java
@@ -0,0 +1,106 @@
+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 InsettableLinearLayout.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 InsettableLinearLayout.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) {
+    }
+
+}