Add swipe-to-dismiss support to PhoneWindow.

This adds a new window feature -- FEATURE_SWIPE_TO_DISMISS -- and a
theme attribute to activate that feature. When the feature is
activated, a SwipeDismissLayout is inflated as the DecorView layout.
SwipeDismissLayout intercepts touch events and steals ones that are
large swipes to the right if its children don't. PhoneWindow registers
handlers that listen for these swipe events, translate the window when
necessary, and finish the activity at the end of the gesture.

Change-Id: I512e758f3c3ffd3b353dba3b911c0e80a88d6f5f

1 files changed, 68 insertions, 1 deletions

diff --git a/policy/src/com/android/internal/policy/impl/PhoneWindow.java b/policy/src/com/android/internal/policy/impl/PhoneWindow.java
index 44fc1f8..7c047c3 100644
--- a/policy/src/com/android/internal/policy/impl/PhoneWindow.java
+++ b/policy/src/com/android/internal/policy/impl/PhoneWindow.java
@@ -38,6 +38,7 @@ import com.android.internal.widget.ActionBarContainer;
 import com.android.internal.widget.ActionBarContextView;
 import com.android.internal.widget.ActionBarOverlayLayout;
 import com.android.internal.widget.ActionBarView;
+import com.android.internal.widget.SwipeDismissLayout;
 
 import android.app.KeyguardManager;
 import android.content.Context;
@@ -267,6 +268,15 @@ public class PhoneWindow extends Window implements MenuBuilder.Callback {
             // Remove the action bar feature if we have no title. No title dominates.
             removeFeature(FEATURE_ACTION_BAR);
         }
+
+        if ((features & (1 << FEATURE_ACTION_BAR)) != 0 && featureId == FEATURE_SWIPE_TO_DISMISS) {
+            throw new AndroidRuntimeException(
+                    "You cannot combine swipe dismissal and the action bar.");
+        }
+        if ((features & (1 << FEATURE_SWIPE_TO_DISMISS)) != 0 && featureId == FEATURE_ACTION_BAR) {
+            throw new AndroidRuntimeException(
+                    "You cannot combine swipe dismissal and the action bar.");
+        }
         return super.requestFeature(featureId);
     }
 
@@ -2838,6 +2848,10 @@ public class PhoneWindow extends Window implements MenuBuilder.Callback {
             requestFeature(FEATURE_ACTION_MODE_OVERLAY);
         }
 
+        if (a.getBoolean(com.android.internal.R.styleable.Window_windowSwipeToDismiss, false)) {
+            requestFeature(FEATURE_SWIPE_TO_DISMISS);
+        }
+
         if (a.getBoolean(com.android.internal.R.styleable.Window_windowFullscreen, false)) {
             setFlags(FLAG_FULLSCREEN, FLAG_FULLSCREEN & (~getForcedWindowFlags()));
         }
@@ -2964,7 +2978,9 @@ public class PhoneWindow extends Window implements MenuBuilder.Callback {
         int layoutResource;
         int features = getLocalFeatures();
         // System.out.println("Features: 0x" + Integer.toHexString(features));
-        if ((features & ((1 << FEATURE_LEFT_ICON) | (1 << FEATURE_RIGHT_ICON))) != 0) {
+        if ((features & (1 << FEATURE_SWIPE_TO_DISMISS)) != 0) {
+            layoutResource = com.android.internal.R.layout.screen_swipe_dismiss;
+        } else if ((features & ((1 << FEATURE_LEFT_ICON) | (1 << FEATURE_RIGHT_ICON))) != 0) {
             if (mIsFloating) {
                 TypedValue res = new TypedValue();
                 getContext().getTheme().resolveAttribute(
@@ -3034,6 +3050,10 @@ public class PhoneWindow extends Window implements MenuBuilder.Callback {
             }
         }
 
+        if ((features & (1 << FEATURE_SWIPE_TO_DISMISS)) != 0) {
+            registerSwipeCallbacks();
+        }
+
         // Remaining setup -- of background and title -- that only applies
         // to top-level windows.
         if (getContainer() == null) {
@@ -3390,6 +3410,53 @@ public class PhoneWindow extends Window implements MenuBuilder.Callback {
         return (mRightIconView = (ImageView)findViewById(com.android.internal.R.id.right_icon));
     }
 
+    private void registerSwipeCallbacks() {
+        SwipeDismissLayout swipeDismiss =
+                (SwipeDismissLayout) findViewById(com.android.internal.R.id.content);
+        swipeDismiss.setOnDismissedListener(new SwipeDismissLayout.OnDismissedListener() {
+            @Override
+            public void onDismissed(SwipeDismissLayout layout) {
+                Callback cb = getCallback();
+                if (cb != null) {
+                    try {
+                        cb.onWindowDismissed();
+                    } catch (AbstractMethodError e) {
+                        Log.e(TAG, "onWindowDismissed not implemented in " +
+                                cb.getClass().getSimpleName(), e);
+                    }
+                }
+            }
+        });
+        swipeDismiss.setOnSwipeProgressChangedListener(
+                new SwipeDismissLayout.OnSwipeProgressChangedListener() {
+                    private boolean mIsTranslucent = false;
+
+                    @Override
+                    public void onSwipeProgressChanged(
+                            SwipeDismissLayout layout, float progress, float translate) {
+                        WindowManager.LayoutParams newParams = getAttributes();
+                        newParams.x = (int) translate;
+                        setAttributes(newParams);
+
+                        int flags = 0;
+                        if (newParams.x == 0) {
+                            flags = FLAG_FULLSCREEN;
+                        } else {
+                            flags = FLAG_LAYOUT_NO_LIMITS;
+                        }
+                        setFlags(flags, FLAG_FULLSCREEN | FLAG_LAYOUT_NO_LIMITS);
+                    }
+
+                    @Override
+                    public void onSwipeCancelled(SwipeDismissLayout layout) {
+                        WindowManager.LayoutParams newParams = getAttributes();
+                        newParams.x = 0;
+                        setAttributes(newParams);
+                        setFlags(FLAG_FULLSCREEN, FLAG_FULLSCREEN | FLAG_LAYOUT_NO_LIMITS);
+                    }
+                });
+    }
+
     /**
      * Helper method for calling the {@link Callback#onPanelClosed(int, Menu)}
      * callback. This method will grab whatever extra state is needed for the