Cancel current work in PrintDocumentAdatper if printing is cancelled.

Layout and write may take some time during which the user can
cancel printing. Currently we wait for the last operation,
being write or layout, to complete before closing the print
dialog. Now in such a scenario we request a cancellation of
the ongoing operation.

bug:11329523

Change-Id: Ia9d747163cc73509369a86c8b5afc83b7ee54859

2 files changed, 13 insertions, 0 deletions

diff --git a/core/java/android/print/IPrintDocumentAdapter.aidl b/core/java/android/print/IPrintDocumentAdapter.aidl
index 9d384fb..2b95c12 100644
--- a/core/java/android/print/IPrintDocumentAdapter.aidl
+++ b/core/java/android/print/IPrintDocumentAdapter.aidl
@@ -37,4 +37,5 @@ oneway interface IPrintDocumentAdapter {
     void write(in PageRange[] pages, in ParcelFileDescriptor fd,
             IWriteResultCallback callback, int sequence);
     void finish();
+    void cancel();
 }
diff --git a/core/java/android/print/PrintManager.java b/core/java/android/print/PrintManager.java
index bbfc307..d6d56bb 100644
--- a/core/java/android/print/PrintManager.java
+++ b/core/java/android/print/PrintManager.java
@@ -616,6 +616,18 @@ public final class PrintManager {
         }
 
         @Override
+        public void cancel() {
+            // Start not called or finish called or destroyed - nothing to do.
+            if (!mStartReqeusted || mFinishRequested || mDestroyed) {
+                return;
+            }
+            // Request cancellation of pending work if needed.
+            synchronized (mLock) {
+                cancelPreviousCancellableOperationLocked();
+            }
+        }
+
+        @Override
         public void onActivityPaused(Activity activity) {
             /* do nothing */
         }