Stylus support: creating and setting listeners for stylus button press

This updates almost(*) all locations that use a long press listener to
also set a custom touch listener that recognizes the stylus button press
action.

The stylus button press action is: when a stylus touches a view while the
primary stylus button is pressed which may occur on a DOWN or MOVE event.

*The location this is *not* enabled for is: Longpress to enter "overview"
mode -- this isn't really a selection or drag n drop action; it is also
easy to accidentally do this while using the stylus gesture to drag n drop
items which is not an ideal interaction. Also not set for the "cling" that
demonstrates this.

Bug: 20430722
Change-Id: I9343f143261a7b4fada9afca28b8a11a60dbecca

1 files changed, 17 insertions, 0 deletions

diff --git a/src/com/android/launcher3/CellLayout.java b/src/com/android/launcher3/CellLayout.java
index 61567ac00..a57c1fe98 100644
--- a/src/com/android/launcher3/CellLayout.java
+++ b/src/com/android/launcher3/CellLayout.java
@@ -95,6 +95,7 @@ public class CellLayout extends ViewGroup implements BubbleTextShadowHandler {
     boolean[][] mTmpOccupied;
 
     private OnTouchListener mInterceptTouchListener;
+    private StylusEventHelper mStylusEventHelper;
 
     private ArrayList<FolderRingAnimator> mFolderOuterRings = new ArrayList<FolderRingAnimator>();
     private int[] mFolderLeaveBehindCell = {-1, -1};
@@ -286,6 +287,8 @@ public class CellLayout extends ViewGroup implements BubbleTextShadowHandler {
         mShortcutsAndWidgets.setCellDimensions(mCellWidth, mCellHeight, mWidthGap, mHeightGap,
                 mCountX, mCountY);
 
+        mStylusEventHelper = new StylusEventHelper(this);
+
         mTouchFeedbackView = new ClickShadowView(context);
         addView(mTouchFeedbackView);
         addView(mShortcutsAndWidgets);
@@ -338,6 +341,20 @@ public class CellLayout extends ViewGroup implements BubbleTextShadowHandler {
         return false;
     }
 
+    @Override
+    public boolean onTouchEvent(MotionEvent ev) {
+        boolean handled = super.onTouchEvent(ev);
+        // Stylus button press on a home screen should not switch between overview mode and
+        // the home screen mode, however, once in overview mode stylus button press should be
+        // enabled to allow rearranging the different home screens. So check what mode
+        // the workspace is in, and only perform stylus button presses while in overview mode.
+        if (mLauncher.mWorkspace.isInOverviewMode()
+                && mStylusEventHelper.checkAndPerformStylusEvent(ev)) {
+            return true;
+        }
+        return handled;
+    }
+
     public void enableHardwareLayer(boolean hasLayer) {
         mShortcutsAndWidgets.setLayerType(hasLayer ? LAYER_TYPE_HARDWARE : LAYER_TYPE_NONE, sPaint);
     }