Add PageIndicator interface and custom PageIndicatorLine view.

- The current PageIndicator has been renamed to PageIndicatorDots
  and PageIndicatorMarker has been renamed to PageIndicatorDot.
- PageIndicatorDots and PageIndicatorLine implement PageIndicator.
- PageIndicatorLine uses scroll progress and number of pages to
  draw a line of the correct size and position.
- All of these page indicator files are now in a pageindicators package.

Bug: 27227498

Change-Id: I9230d2e0600ce583989bd31d0b0e252b148d15c2

1 files changed, 31 insertions, 0 deletions

diff --git a/src/com/android/launcher3/pageindicators/PageIndicator.java b/src/com/android/launcher3/pageindicators/PageIndicator.java
new file mode 100644
index 000000000..6348b123b
--- /dev/null
+++ b/src/com/android/launcher3/pageindicators/PageIndicator.java
@@ -0,0 +1,31 @@
+package com.android.launcher3.pageindicators;
+
+import android.view.View;
+
+import java.util.ArrayList;
+
+public interface PageIndicator {
+    View getView();
+    void setProgress(float progress);
+
+    void removeAllMarkers(boolean allowAnimations);
+    void addMarkers(ArrayList<PageMarkerResources> markers, boolean allowAnimations);
+    void setActiveMarker(int activePage);
+    void addMarker(int pageIndex, PageMarkerResources pageIndicatorMarker, boolean allowAnimations);
+    void removeMarker(int pageIndex, boolean allowAnimations);
+    void updateMarker(int pageIndex, PageMarkerResources pageIndicatorMarker);
+
+    /**
+     * Contains two resource ids for each page indicator marker (e.g. dots):
+     * one for when the page is active and one for when the page is inactive.
+     */
+    class PageMarkerResources {
+        int activeId;
+        int inactiveId;
+
+        public PageMarkerResources(int aId, int iaId) {
+            activeId = aId;
+            inactiveId = iaId;
+        }
+    }
+}