ObservableList: add ability to block (delay) change notifications

[mobile-ledger.git] / app / src / main / java / net / ktnx / mobileledger / utils / ObservableList.java

diff --git a/app/src/main/java/net/ktnx/mobileledger/utils/ObservableList.java b/app/src/main/java/net/ktnx/mobileledger/utils/ObservableList.java
index 3add1bd488ce940c5f77a6db3a41306f64b254b2..b5ddb8780a368bcd1166061faf8120a276786de3 100644 (file)
--- a/app/src/main/java/net/ktnx/mobileledger/utils/ObservableList.java
+++ b/app/src/main/java/net/ktnx/mobileledger/utils/ObservableList.java
@@ -42,14 +42,21 @@ import androidx.annotation.RequiresApi;
 public class ObservableList<T> extends Observable implements List<T> {
     private List<T> list;
     private ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
+    private int notificationBlocks = 0;
+    private boolean notificationWasBlocked = false;
     public ObservableList(List<T> list) {
         this.list = list;
     }
     private void forceNotify() {
+        if (notificationBlocked()) return;
         setChanged();
         notifyObservers();
     }
+    private boolean notificationBlocked() {
+        return notificationWasBlocked = (notificationBlocks > 0);
+    }
     private void forceNotify(int index) {
+        if (notificationBlocked()) return;
         setChanged();
         notifyObservers(index);
     }
@@ -297,4 +304,11 @@ public class ObservableList<T> extends Observable implements List<T> {
         rLock.lock();
         return new LockHolder(rLock);
     }
+    public void blockNotifications() {
+        notificationBlocks++;
+    }
+    public void unblockNotifications() {
+        notificationBlocks--;
+        if ((notificationBlocks == 0) && notificationWasBlocked) notifyObservers();
+    }
 }
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