Major changes in the event handling architecture. Support for multiple event handlers.

11 files changed, 99 insertions, 105 deletions

diff --git a/src/main/kotlin/pl/treksoft/kvision/core/Widget.kt b/src/main/kotlin/pl/treksoft/kvision/core/Widget.kt
index 6b98664f..e1871c6c 100644
--- a/src/main/kotlin/pl/treksoft/kvision/core/Widget.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/core/Widget.kt
@@ -57,8 +57,8 @@ open class Widget(classes: Set<String> = setOf()) : StyledComponent(), Component
     internal val classes = classes.toMutableSet()
     internal val surroundingClasses: MutableSet<String> = mutableSetOf()
     internal val attributes: MutableMap<String, String> = mutableMapOf()
-    internal val internalListeners = mutableListOf<SnOn<Widget>.() -> Unit>()
-    internal val listeners = mutableListOf<SnOn<Widget>.() -> Unit>()
+    internal val listenersMap = mutableMapOf<String, MutableMap<Int, SnOn<Widget>.() -> Unit>>()
+    internal var listenerCounter: Int = 0
 
     override var parent: Container? = null
 
@@ -259,59 +259,14 @@ open class Widget(classes: Set<String> = setOf()) : StyledComponent(), Component
      * Returns list of event handlers in the form of a Snabbdom *On* object.
      * @return list of event handlers
      */
-    @Suppress("ComplexMethod")
     protected open fun getSnOn(): com.github.snabbdom.On? {
-        return if (internalListeners.size > 0 || listeners.size > 0) {
-            val internalHandlers = on(this)
-            internalListeners.forEach { l -> (internalHandlers::apply)(l) }
+        return if (listenersMap.isNotEmpty()) {
             val handlers = on(eventTarget ?: this)
-            listeners.forEach { l -> (handlers::apply)(l) }
-            if (internalHandlers.click != null) {
-                if (handlers.click == null) {
-                    handlers.click = internalHandlers.click
+            listenersMap.filter { it.value.isNotEmpty() }.forEach { (event, listeners) ->
+                handlers.asDynamic()[event] = if (listeners.size == 1) {
+                    listeners.values.first()
                 } else {
-                    val intc = internalHandlers.click
-                    val c = handlers.click
-                    handlers.click = { e ->
-                        intc?.invoke(e)
-                        c?.invoke(e)
-                    }
-                }
-            }
-            if (internalHandlers.change != null) {
-                if (handlers.change == null) {
-                    handlers.change = internalHandlers.change
-                } else {
-                    val intc = internalHandlers.change
-                    val c = handlers.change
-                    handlers.change = { e ->
-                        intc?.invoke(e)
-                        c?.invoke(e)
-                    }
-                }
-            }
-            if (internalHandlers.input != null) {
-                if (handlers.input == null) {
-                    handlers.input = internalHandlers.input
-                } else {
-                    val intc = internalHandlers.input
-                    val c = handlers.input
-                    handlers.input = { e ->
-                        intc?.invoke(e)
-                        c?.invoke(e)
-                    }
-                }
-            }
-            if (internalHandlers.shownBsSelect != null) {
-                if (handlers.shownBsSelect == null) {
-                    handlers.shownBsSelect = internalHandlers.shownBsSelect
-                } else {
-                    val intc = internalHandlers.shownBsSelect
-                    val c = handlers.shownBsSelect
-                    handlers.shownBsSelect = { e ->
-                        intc?.invoke(e)
-                        c?.invoke(e)
-                    }
+                    listeners.map { arrayOf(it.value) }.toTypedArray()
                 }
             }
             handlers
@@ -347,21 +302,10 @@ open class Widget(classes: Set<String> = setOf()) : StyledComponent(), Component
     }
 
     /**
-     * @suppress
-     * Internal function
-     */
-    @Suppress("UNCHECKED_CAST")
-    protected fun <T : Widget> setInternalEventListener(block: SnOn<T>.() -> Unit): Widget {
-        internalListeners.add(block as SnOn<Widget>.() -> Unit)
-        refresh()
-        return this
-    }
-
-    /**
      * Sets an event listener for current widget, keeping the actual type of component.
      * @param T widget type
      * @param block event handler
-     * @return current widget
+     * @return id of the handler
      *
      * Example:
      *
@@ -373,16 +317,28 @@ open class Widget(classes: Set<String> = setOf()) : StyledComponent(), Component
      *      }
      */
     @Suppress("UNCHECKED_CAST")
-    open fun <T : Widget> setEventListener(block: SnOn<T>.() -> Unit): Widget {
-        listeners.add(block as SnOn<Widget>.() -> Unit)
+    open fun <T : Widget> setEventListener(block: SnOn<T>.() -> Unit): Int {
+        val handlerCounter = listenerCounter++
+        val blockAsWidget = block as SnOn<Widget>.() -> Unit
+        val handlers = js("{}") as SnOn<Widget>
+        (handlers::apply)(blockAsWidget)
+        for (key: String in js("Object").keys(handlers)) {
+            val handler = handlers.asDynamic()[key]
+            val map = listenersMap[key]
+            if (map != null) {
+                map[handlerCounter] = handler
+            } else {
+                listenersMap[key] = mutableMapOf(handlerCounter to handler)
+            }
+        }
         refresh()
-        return this
+        return handlerCounter
     }
 
     /**
      * Sets an event listener for current widget.
      * @param block event handler
-     * @return current widget
+     * @return id of the handler
      *
      * Example:
      *
@@ -393,9 +349,21 @@ open class Widget(classes: Set<String> = setOf()) : StyledComponent(), Component
      *          }
      *      }
      */
-    @Deprecated("Use onEvent extension function instead.", ReplaceWith("onEvent(block)", "pl.treksoft.kvision.core.onEvent"))
-    open fun setEventListener(block: SnOn<Widget>.() -> Unit): Widget {
-        listeners.add(block)
+    @Deprecated(
+        "Use onEvent extension function instead.",
+        ReplaceWith("onEvent(block)", "pl.treksoft.kvision.core.onEvent")
+    )
+    open fun setEventListener(block: SnOn<Widget>.() -> Unit): Int {
+        return setEventListener<Widget>(block)
+    }
+
+    /**
+     * Removes event listener from current widget.
+     * @param id the id of the handler returned by onEvent
+     * @return current widget
+     */
+    open fun removeEventListener(id: Int): Widget {
+        listenersMap.forEach { it.value.remove(id) }
         refresh()
         return this
     }
@@ -405,7 +373,7 @@ open class Widget(classes: Set<String> = setOf()) : StyledComponent(), Component
      * @return current widget
      */
     open fun removeEventListeners(): Widget {
-        listeners.clear()
+        listenersMap.clear()
         refresh()
         return this
     }
@@ -819,6 +787,6 @@ fun Container.widget(classes: Set<String> = setOf(), init: (Widget.() -> Unit)?
     return widget
 }
 
-inline fun <reified T : Widget> T.onEvent(noinline block: SnOn<T>.() -> Unit): Widget {
+inline fun <reified T : Widget> T.onEvent(noinline block: SnOn<T>.() -> Unit): Int {
     return this.setEventListener(block)
 }
diff --git a/src/main/kotlin/pl/treksoft/kvision/form/check/CheckBox.kt b/src/main/kotlin/pl/treksoft/kvision/form/check/CheckBox.kt
index 8575b09e..7dae0f86 100644
--- a/src/main/kotlin/pl/treksoft/kvision/form/check/CheckBox.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/form/check/CheckBox.kt
@@ -123,15 +123,21 @@ open class CheckBox(
     }
 
     @Suppress("UNCHECKED_CAST")
-    override fun <T : Widget> setEventListener(block: SnOn<T>.() -> Unit): Widget {
-        input.setEventListener(block)
-        return this
+    override fun <T : Widget> setEventListener(block: SnOn<T>.() -> Unit): Int {
+        return input.setEventListener(block)
     }
 
-    @Deprecated("Use onEvent extension function instead.", ReplaceWith("onEvent(block)", "pl.treksoft.kvision.core.onEvent"))
-    override fun setEventListener(block: SnOn<Widget>.() -> Unit): Widget {
+    @Deprecated(
+        "Use onEvent extension function instead.",
+        ReplaceWith("onEvent(block)", "pl.treksoft.kvision.core.onEvent")
+    )
+    override fun setEventListener(block: SnOn<Widget>.() -> Unit): Int {
         @Suppress("DEPRECATION")
-        input.setEventListener(block)
+        return input.setEventListener(block)
+    }
+
+    override fun removeEventListener(id: Int): Widget {
+        input.removeEventListener(id)
         return this
     }
 
diff --git a/src/main/kotlin/pl/treksoft/kvision/form/check/CheckInput.kt b/src/main/kotlin/pl/treksoft/kvision/form/check/CheckInput.kt
index f93fd436..b5c3ead0 100644
--- a/src/main/kotlin/pl/treksoft/kvision/form/check/CheckInput.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/form/check/CheckInput.kt
@@ -26,6 +26,7 @@ import org.w3c.dom.events.MouseEvent
 import pl.treksoft.kvision.core.StringBoolPair
 import pl.treksoft.kvision.core.StringPair
 import pl.treksoft.kvision.core.Widget
+import pl.treksoft.kvision.core.onEvent
 import pl.treksoft.kvision.form.FormInput
 import pl.treksoft.kvision.form.InputSize
 import pl.treksoft.kvision.form.ValidationStatus
@@ -52,7 +53,7 @@ abstract class CheckInput(
 ) : Widget(classes), FormInput {
 
     init {
-        this.setInternalEventListener<CheckInput> {
+        this.onEvent {
             click = {
                 val v = getElementJQuery()?.prop("checked") as Boolean?
                 self.value = (v == true)
diff --git a/src/main/kotlin/pl/treksoft/kvision/form/check/Radio.kt b/src/main/kotlin/pl/treksoft/kvision/form/check/Radio.kt
index bef7f078..4d8a1607 100644
--- a/src/main/kotlin/pl/treksoft/kvision/form/check/Radio.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/form/check/Radio.kt
@@ -133,15 +133,21 @@ open class Radio(
     }
 
     @Suppress("UNCHECKED_CAST")
-    override fun <T : Widget> setEventListener(block: SnOn<T>.() -> Unit): Widget {
-        input.setEventListener(block)
-        return this
+    override fun <T : Widget> setEventListener(block: SnOn<T>.() -> Unit): Int {
+        return input.setEventListener(block)
     }
 
-    @Deprecated("Use onEvent extension function instead.", ReplaceWith("onEvent(block)", "pl.treksoft.kvision.core.onEvent"))
-    override fun setEventListener(block: SnOn<Widget>.() -> Unit): Widget {
+    @Deprecated(
+        "Use onEvent extension function instead.",
+        ReplaceWith("onEvent(block)", "pl.treksoft.kvision.core.onEvent")
+    )
+    override fun setEventListener(block: SnOn<Widget>.() -> Unit): Int {
         @Suppress("DEPRECATION")
-        input.setEventListener(block)
+        return input.setEventListener(block)
+    }
+
+    override fun removeEventListener(id: Int): Widget {
+        input.removeEventListener(id)
         return this
     }
 
diff --git a/src/main/kotlin/pl/treksoft/kvision/form/range/Range.kt b/src/main/kotlin/pl/treksoft/kvision/form/range/Range.kt
index ac772d02..a03ce2c8 100644
--- a/src/main/kotlin/pl/treksoft/kvision/form/range/Range.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/form/range/Range.kt
@@ -161,18 +161,21 @@ open class Range(
     }
 
     @Suppress("UNCHECKED_CAST")
-    override fun <T : Widget> setEventListener(block: SnOn<T>.() -> Unit): Widget {
-        input.setEventListener(block)
-        return this
+    override fun <T : Widget> setEventListener(block: SnOn<T>.() -> Unit): Int {
+        return input.setEventListener(block)
     }
 
     @Deprecated(
         "Use onEvent extension function instead.",
         ReplaceWith("onEvent(block)", "pl.treksoft.kvision.core.onEvent")
     )
-    override fun setEventListener(block: SnOn<Widget>.() -> Unit): Widget {
+    override fun setEventListener(block: SnOn<Widget>.() -> Unit): Int {
         @Suppress("DEPRECATION")
-        input.setEventListener(block)
+        return input.setEventListener(block)
+    }
+
+    override fun removeEventListener(id: Int): Widget {
+        input.removeEventListener(id)
         return this
     }
 
diff --git a/src/main/kotlin/pl/treksoft/kvision/form/range/RangeInput.kt b/src/main/kotlin/pl/treksoft/kvision/form/range/RangeInput.kt
index dc9ad7d4..b2471411 100644
--- a/src/main/kotlin/pl/treksoft/kvision/form/range/RangeInput.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/form/range/RangeInput.kt
@@ -27,6 +27,7 @@ import pl.treksoft.kvision.core.Container
 import pl.treksoft.kvision.core.StringBoolPair
 import pl.treksoft.kvision.core.StringPair
 import pl.treksoft.kvision.core.Widget
+import pl.treksoft.kvision.core.onEvent
 import pl.treksoft.kvision.form.FormInput
 import pl.treksoft.kvision.form.InputSize
 import pl.treksoft.kvision.form.ValidationStatus
@@ -97,7 +98,7 @@ open class RangeInput(
     override var validationStatus: ValidationStatus? by refreshOnUpdate()
 
     init {
-        this.setInternalEventListener<RangeInput> {
+        this.onEvent {
             change = {
                 self.changeValue()
             }
diff --git a/src/main/kotlin/pl/treksoft/kvision/form/select/SimpleSelect.kt b/src/main/kotlin/pl/treksoft/kvision/form/select/SimpleSelect.kt
index 5b262cef..97e61de3 100644
--- a/src/main/kotlin/pl/treksoft/kvision/form/select/SimpleSelect.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/form/select/SimpleSelect.kt
@@ -137,15 +137,18 @@ open class SimpleSelect(
     }
 
     @Suppress("UNCHECKED_CAST")
-    override fun <T : Widget> setEventListener(block: SnOn<T>.() -> Unit): Widget {
-        input.setEventListener(block)
-        return this
+    override fun <T : Widget> setEventListener(block: SnOn<T>.() -> Unit): Int {
+        return input.setEventListener(block)
     }
 
     @Deprecated("Use onEvent extension function instead.", ReplaceWith("onEvent(block)", "pl.treksoft.kvision.core.onEvent"))
-    override fun setEventListener(block: SnOn<Widget>.() -> Unit): Widget {
+    override fun setEventListener(block: SnOn<Widget>.() -> Unit): Int {
         @Suppress("DEPRECATION")
-        input.setEventListener(block)
+        return input.setEventListener(block)
+    }
+
+    override fun removeEventListener(id: Int): Widget {
+        input.removeEventListener(id)
         return this
     }
 
diff --git a/src/main/kotlin/pl/treksoft/kvision/form/select/SimpleSelectInput.kt b/src/main/kotlin/pl/treksoft/kvision/form/select/SimpleSelectInput.kt
index bc99f514..796f653c 100644
--- a/src/main/kotlin/pl/treksoft/kvision/form/select/SimpleSelectInput.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/form/select/SimpleSelectInput.kt
@@ -25,6 +25,7 @@ import com.github.snabbdom.VNode
 import pl.treksoft.kvision.core.Container
 import pl.treksoft.kvision.core.StringBoolPair
 import pl.treksoft.kvision.core.StringPair
+import pl.treksoft.kvision.core.onEvent
 import pl.treksoft.kvision.form.FormInput
 import pl.treksoft.kvision.form.InputSize
 import pl.treksoft.kvision.form.ValidationStatus
@@ -91,7 +92,7 @@ open class SimpleSelectInput(
 
     init {
         setChildrenFromOptions()
-        this.setInternalEventListener<SimpleSelectInput> {
+        this.onEvent {
             change = {
                 self.changeValue()
             }
diff --git a/src/main/kotlin/pl/treksoft/kvision/form/text/AbstractText.kt b/src/main/kotlin/pl/treksoft/kvision/form/text/AbstractText.kt
index 250d142e..c7528cb1 100644
--- a/src/main/kotlin/pl/treksoft/kvision/form/text/AbstractText.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/form/text/AbstractText.kt
@@ -134,15 +134,18 @@ abstract class AbstractText(label: String? = null, rich: Boolean = false) :
     }
 
     @Suppress("UNCHECKED_CAST")
-    override fun <T : Widget> setEventListener(block: SnOn<T>.() -> Unit): Widget {
-        input.setEventListener(block)
-        return this
+    override fun <T : Widget> setEventListener(block: SnOn<T>.() -> Unit): Int {
+        return input.setEventListener(block)
     }
 
     @Deprecated("Use onEvent extension function instead.", ReplaceWith("onEvent(block)", "pl.treksoft.kvision.core.onEvent"))
-    override fun setEventListener(block: SnOn<Widget>.() -> Unit): Widget {
+    override fun setEventListener(block: SnOn<Widget>.() -> Unit): Int {
         @Suppress("DEPRECATION")
-        input.setEventListener(block)
+        return input.setEventListener(block)
+    }
+
+    override fun removeEventListener(id: Int): Widget {
+        input.removeEventListener(id)
         return this
     }
 
diff --git a/src/main/kotlin/pl/treksoft/kvision/form/text/AbstractTextInput.kt b/src/main/kotlin/pl/treksoft/kvision/form/text/AbstractTextInput.kt
index 192b33c8..343129f3 100644
--- a/src/main/kotlin/pl/treksoft/kvision/form/text/AbstractTextInput.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/form/text/AbstractTextInput.kt
@@ -25,6 +25,7 @@ import com.github.snabbdom.VNode
 import pl.treksoft.kvision.core.StringBoolPair
 import pl.treksoft.kvision.core.StringPair
 import pl.treksoft.kvision.core.Widget
+import pl.treksoft.kvision.core.onEvent
 import pl.treksoft.kvision.form.FormInput
 import pl.treksoft.kvision.form.InputSize
 import pl.treksoft.kvision.form.ValidationStatus
@@ -42,7 +43,7 @@ abstract class AbstractTextInput(
 ) : Widget(classes), FormInput {
 
     init {
-        this.setInternalEventListener<AbstractTextInput> {
+        this.onEvent {
             input = {
                 self.changeValue()
             }
diff --git a/src/main/kotlin/pl/treksoft/kvision/panel/Root.kt b/src/main/kotlin/pl/treksoft/kvision/panel/Root.kt
index b1bb36a8..4b02db5a 100644
--- a/src/main/kotlin/pl/treksoft/kvision/panel/Root.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/panel/Root.kt
@@ -29,6 +29,7 @@ import pl.treksoft.kvision.KVManager
 import pl.treksoft.kvision.core.StringBoolPair
 import pl.treksoft.kvision.core.Style
 import pl.treksoft.kvision.core.Widget
+import pl.treksoft.kvision.core.onEvent
 import pl.treksoft.kvision.utils.snClasses
 import pl.treksoft.kvision.utils.snOpt
 import kotlin.browser.document
@@ -103,7 +104,7 @@ class Root : SimplePanel {
     fun addContextMenu(contextMenu: Widget) {
         contextMenus.add(contextMenu)
         contextMenu.parent = this
-        this.setInternalEventListener<Root> {
+        this.onEvent {
             click = { e ->
                 @Suppress("UnsafeCastFromDynamic")
                 if (!e.asDynamic().dropDownCM) contextMenu.hide()