Fix date picker color handling, expose StateSet utils in more places

Enabled use of color selectors for the day number text, which lets us
use the "activated" text color and push the selection background
opacity up to 100%. Also ensures the selector circle stays within the
bounds of the selected day.

BUG: 18864682
Change-Id: Ia36ea748f83e13683a1de8ac1a259d353578d61a

1 files changed, 82 insertions, 1 deletions

diff --git a/core/java/android/util/StateSet.java b/core/java/android/util/StateSet.java
index 2623638d781b..83dfc4705d09 100644
--- a/core/java/android/util/StateSet.java
+++ b/core/java/android/util/StateSet.java
@@ -36,7 +36,88 @@ import com.android.internal.R;
  */
 
 public class StateSet {
-    /** @hide */ public StateSet() {}
+    /**
+     * The order here is very important to
+     * {@link android.view.View#getDrawableState()}
+     */
+    private static final int[][] VIEW_STATE_SETS;
+
+    /** @hide */
+    public static final int VIEW_STATE_WINDOW_FOCUSED = 1;
+    /** @hide */
+    public static final int VIEW_STATE_SELECTED = 1 << 1;
+    /** @hide */
+    public static final int VIEW_STATE_FOCUSED = 1 << 2;
+    /** @hide */
+    public static final int VIEW_STATE_ENABLED = 1 << 3;
+    /** @hide */
+    public static final int VIEW_STATE_PRESSED = 1 << 4;
+    /** @hide */
+    public static final int VIEW_STATE_ACTIVATED = 1 << 5;
+    /** @hide */
+    public static final int VIEW_STATE_ACCELERATED = 1 << 6;
+    /** @hide */
+    public static final int VIEW_STATE_HOVERED = 1 << 7;
+    /** @hide */
+    public static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8;
+    /** @hide */
+    public static final int VIEW_STATE_DRAG_HOVERED = 1 << 9;
+
+    static final int[] VIEW_STATE_IDS = new int[] {
+            R.attr.state_window_focused,    VIEW_STATE_WINDOW_FOCUSED,
+            R.attr.state_selected,          VIEW_STATE_SELECTED,
+            R.attr.state_focused,           VIEW_STATE_FOCUSED,
+            R.attr.state_enabled,           VIEW_STATE_ENABLED,
+            R.attr.state_pressed,           VIEW_STATE_PRESSED,
+            R.attr.state_activated,         VIEW_STATE_ACTIVATED,
+            R.attr.state_accelerated,       VIEW_STATE_ACCELERATED,
+            R.attr.state_hovered,           VIEW_STATE_HOVERED,
+            R.attr.state_drag_can_accept,   VIEW_STATE_DRAG_CAN_ACCEPT,
+            R.attr.state_drag_hovered,      VIEW_STATE_DRAG_HOVERED
+    };
+
+    static {
+        if ((VIEW_STATE_IDS.length / 2) != R.styleable.ViewDrawableStates.length) {
+            throw new IllegalStateException(
+                    "VIEW_STATE_IDs array length does not match ViewDrawableStates style array");
+        }
+
+        final int[] orderedIds = new int[VIEW_STATE_IDS.length];
+        for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) {
+            final int viewState = R.styleable.ViewDrawableStates[i];
+            for (int j = 0; j < VIEW_STATE_IDS.length; j += 2) {
+                if (VIEW_STATE_IDS[j] == viewState) {
+                    orderedIds[i * 2] = viewState;
+                    orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1];
+                }
+            }
+        }
+
+        final int NUM_BITS = VIEW_STATE_IDS.length / 2;
+        VIEW_STATE_SETS = new int[1 << NUM_BITS][];
+        for (int i = 0; i < VIEW_STATE_SETS.length; i++) {
+            final int numBits = Integer.bitCount(i);
+            final int[] set = new int[numBits];
+            int pos = 0;
+            for (int j = 0; j < orderedIds.length; j += 2) {
+                if ((i & orderedIds[j + 1]) != 0) {
+                    set[pos++] = orderedIds[j];
+                }
+            }
+            VIEW_STATE_SETS[i] = set;
+        }
+    }
+
+    /** @hide */
+    public static int[] get(int mask) {
+        if (mask >= VIEW_STATE_SETS.length) {
+            throw new IllegalArgumentException("Invalid state set mask");
+        }
+        return VIEW_STATE_SETS[mask];
+    }
+
+    /** @hide */
+    public StateSet() {}
 
     public static final int[] WILD_CARD = new int[0];
     public static final int[] NOTHING = new int[] { 0 };