New event flow module (#140)

1 files changed, 81 insertions, 0 deletions

diff --git a/kvision-modules/kvision-event-flow/src/main/kotlin/pl/treksoft/kvision/event/EventFlow.kt b/kvision-modules/kvision-event-flow/src/main/kotlin/pl/treksoft/kvision/event/EventFlow.kt
new file mode 100644
index 00000000..3a93d2a5
--- /dev/null
+++ b/kvision-modules/kvision-event-flow/src/main/kotlin/pl/treksoft/kvision/event/EventFlow.kt
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2017-present Robert Jaros
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package pl.treksoft.kvision.event
+
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.channels.awaitClose
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.callbackFlow
+import org.w3c.dom.events.Event
+import pl.treksoft.kvision.core.Widget
+import pl.treksoft.kvision.core.onEvent
+
+@UseExperimental(ExperimentalCoroutinesApi::class)
+inline fun <reified T : Widget> T.eventFlow(event: String): Flow<Pair<T, Event>> = callbackFlow {
+    val id = onEvent {
+        this.asDynamic()[event] = { e: Event ->
+            offer(self to e)
+        }
+    }
+    awaitClose {
+        removeEventListener(id)
+    }
+}
+
+@UseExperimental(ExperimentalCoroutinesApi::class)
+inline val <reified T : Widget> T.clickFlow: Flow<T>
+    get() = callbackFlow {
+        val id = onEvent {
+            click = {
+                offer(self)
+            }
+        }
+        awaitClose {
+            removeEventListener(id)
+        }
+    }
+
+@UseExperimental(ExperimentalCoroutinesApi::class)
+inline val <reified T : Widget> T.inputFlow: Flow<T>
+    get() = callbackFlow {
+        val id = onEvent {
+            input = {
+                offer(self)
+            }
+        }
+        awaitClose {
+            removeEventListener(id)
+        }
+    }
+
+@UseExperimental(ExperimentalCoroutinesApi::class)
+inline val <reified T : Widget> T.changeFlow: Flow<T>
+    get() = callbackFlow {
+        val id = onEvent {
+            change = {
+                offer(self)
+            }
+        }
+        awaitClose {
+            removeEventListener(id)
+        }
+    }