Merge pull request #235 from vector-im/feature/debounce

Debounce click on room

vector/src/main/java/im/vector/riotredesign/core/extensions/LiveData.kt

@@ -19,8 +19,9 @@ package im.vector.riotredesign.core.extensions
 import androidx.lifecycle.LifecycleOwner
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.Observer
-import im.vector.riotredesign.core.utils.LiveEvent
+import im.vector.riotredesign.core.utils.Debouncer
 import im.vector.riotredesign.core.utils.EventObserver
+import im.vector.riotredesign.core.utils.LiveEvent
 
 inline fun <T> LiveData<T>.observeK(owner: LifecycleOwner, crossinline observer: (T?) -> Unit) {
     this.observe(owner, Observer { observer(it) })
@@ -32,4 +33,14 @@ inline fun <T> LiveData<T>.observeNotNull(owner: LifecycleOwner, crossinline obs
 
 inline fun <T> LiveData<LiveEvent<T>>.observeEvent(owner: LifecycleOwner, crossinline observer: (T) -> Unit) {
     this.observe(owner, EventObserver { it.run(observer) })
-}
+}
+
+inline fun <T> LiveData<LiveEvent<T>>.observeEventDebounced(owner: LifecycleOwner, minimumInterval: Long, crossinline observer: (T) -> Unit) {
+    val debouncer = Debouncer(minimumInterval)
+
+    this.observe(owner, EventObserver {
+        if (debouncer.canHandle()) {
+            it.run(observer)
+        }
+    })
+}

vector/src/main/java/im/vector/riotredesign/core/utils/Debouncer.kt

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2019 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package im.vector.riotredesign.core.utils
+
+
+/**
+ * Simple Debouncer
+ */
+class Debouncer(private val minimumInterval: Long = 800) {
+    private var lastDate = 0L
+
+    fun canHandle(): Boolean {
+        val now = System.currentTimeMillis()
+        if (now > lastDate + minimumInterval) {
+            lastDate = now
+            return true
+        }
+
+        // Too soon
+        return false
+    }
+}

vector/src/main/java/im/vector/riotredesign/features/home/room/list/RoomListFragment.kt

@@ -30,7 +30,7 @@ import im.vector.matrix.android.api.session.room.model.RoomSummary
 import im.vector.riotredesign.R
 import im.vector.riotredesign.core.di.ScreenComponent
 import im.vector.riotredesign.core.epoxy.LayoutManagerStateRestorer
-import im.vector.riotredesign.core.extensions.observeEvent
+import im.vector.riotredesign.core.extensions.observeEventDebounced
 import im.vector.riotredesign.core.platform.OnBackPressed
 import im.vector.riotredesign.core.platform.StateView
 import im.vector.riotredesign.core.platform.VectorBaseFragment
@@ -77,7 +77,7 @@ class RoomListFragment : VectorBaseFragment(), RoomSummaryController.Callback, O
         setupCreateRoomButton()
         setupRecyclerView()
         roomListViewModel.subscribe { renderState(it) }
-        roomListViewModel.openRoomLiveData.observeEvent(this) {
+        roomListViewModel.openRoomLiveData.observeEventDebounced(this, 800L) {
             navigator.openRoom(requireActivity(), it)
         }