From c763c4e4d28c256d1368be3fc1c4526c8b9bd232 Mon Sep 17 00:00:00 2001
From: Winson Chung <winsonc@google.com>
Date: Fri, 19 Jul 2013 13:49:06 -0700
Subject: Verifying that new applications are added and fixing issue with new
 items getting wrong ids.

- Fixing issue where the LauncherModel would be out of sync on first migration, and subsequent crashes

Change-Id: I6f58b09b615b28958c7f941e58ff9ae0ee3ba939
---
 src/com/android/launcher3/Utilities.java | 95 ++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)

(limited to 'src/com/android/launcher3/Utilities.java')

diff --git a/src/com/android/launcher3/Utilities.java b/src/com/android/launcher3/Utilities.java
index 0cc29faa3..cc22bb5db 100644
--- a/src/com/android/launcher3/Utilities.java
+++ b/src/com/android/launcher3/Utilities.java
@@ -25,6 +25,7 @@ import android.graphics.BlurMaskFilter;
 import android.graphics.Canvas;
 import android.graphics.ColorMatrix;
 import android.graphics.ColorMatrixColorFilter;
+import android.graphics.Matrix;
 import android.graphics.Paint;
 import android.graphics.PaintFlagsDrawFilter;
 import android.graphics.PorterDuff;
@@ -33,6 +34,10 @@ import android.graphics.drawable.BitmapDrawable;
 import android.graphics.drawable.Drawable;
 import android.graphics.drawable.PaintDrawable;
 import android.util.DisplayMetrics;
+import android.view.View;
+import android.view.ViewGroup;
+
+import java.util.ArrayList;
 
 import com.android.launcher3.R;
 
@@ -232,6 +237,96 @@ final class Utilities {
         }
     }
 
+    /**
+     * Given a coordinate relative to the descendant, find the coordinate in a parent view's
+     * coordinates.
+     *
+     * @param descendant The descendant to which the passed coordinate is relative.
+     * @param root The root view to make the coordinates relative to.
+     * @param coord The coordinate that we want mapped.
+     * @param includeRootScroll Whether or not to account for the scroll of the descendant:
+     *          sometimes this is relevant as in a child's coordinates within the descendant.
+     * @return The factor by which this descendant is scaled relative to this DragLayer. Caution
+     *         this scale factor is assumed to be equal in X and Y, and so if at any point this
+     *         assumption fails, we will need to return a pair of scale factors.
+     */
+    public static float getDescendantCoordRelativeToParent(View descendant, View root,
+                                                           int[] coord, boolean includeRootScroll) {
+        ArrayList<View> ancestorChain = new ArrayList<View>();
+
+        float[] pt = {coord[0], coord[1]};
+
+        View v = descendant;
+        while(v != root && v != null) {
+            ancestorChain.add(v);
+            v = (View) v.getParent();
+        }
+        ancestorChain.add(root);
+
+        float scale = 1.0f;
+        int count = ancestorChain.size();
+        for (int i = 0; i < count; i++) {
+            View v0 = ancestorChain.get(i);
+            View v1 = i < count -1 ? ancestorChain.get(i + 1) : null;
+
+            // For TextViews, scroll has a meaning which relates to the text position
+            // which is very strange... ignore the scroll.
+            if (v0 != descendant || includeRootScroll) {
+                pt[0] -= v0.getScrollX();
+                pt[1] -= v0.getScrollY();
+            }
+
+            v0.getMatrix().mapPoints(pt);
+            pt[0] += v0.getLeft();
+            pt[1] += v0.getTop();
+            scale *= v0.getScaleX();
+        }
+
+        coord[0] = (int) Math.round(pt[0]);
+        coord[1] = (int) Math.round(pt[1]);
+        return scale;
+    }
+
+    /**
+     * Inverse of {@link #getDescendantCoordRelativeToSelf(View, int[])}.
+     */
+    public static float mapCoordInSelfToDescendent(View descendant, View root,
+                                                   int[] coord) {
+        ArrayList<View> ancestorChain = new ArrayList<View>();
+
+        float[] pt = {coord[0], coord[1]};
+
+        View v = descendant;
+        while(v != root) {
+            ancestorChain.add(v);
+            v = (View) v.getParent();
+        }
+        ancestorChain.add(root);
+
+        float scale = 1.0f;
+        Matrix inverse = new Matrix();
+        int count = ancestorChain.size();
+        for (int i = count - 1; i >= 0; i--) {
+            View ancestor = ancestorChain.get(i);
+            View next = i > 0 ? ancestorChain.get(i-1) : null;
+
+            pt[0] += ancestor.getScrollX();
+            pt[1] += ancestor.getScrollY();
+
+            if (next != null) {
+                pt[0] -= next.getLeft();
+                pt[1] -= next.getTop();
+                next.getMatrix().invert(inverse);
+                inverse.mapPoints(pt);
+                scale *= next.getScaleX();
+            }
+        }
+
+        coord[0] = (int) Math.round(pt[0]);
+        coord[1] = (int) Math.round(pt[1]);
+        return scale;
+    }
+
     private static void initStatics(Context context) {
         final Resources resources = context.getResources();
         final DisplayMetrics metrics = resources.getDisplayMetrics();
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