From 06f297d68887c7934e66d2c757abc8bf619df66a Mon Sep 17 00:00:00 2001
From: Robert Jaros <rjaros@finn.pl>
Date: Sat, 28 Oct 2017 23:45:26 +0200
Subject: Databinding components Event handlers refactoring

---
 src/main/kotlin/pl/treksoft/kvision/Showcase.kt    | 81 +++++++++++++++++++---
 .../kotlin/pl/treksoft/kvision/core/Container.kt   | 61 +++-------------
 src/main/kotlin/pl/treksoft/kvision/core/Root.kt   |  9 ++-
 src/main/kotlin/pl/treksoft/kvision/core/Widget.kt | 79 +++++++++++++++++++--
 .../pl/treksoft/kvision/data/DataComponent.kt      | 15 ++++
 .../pl/treksoft/kvision/data/DataContainer.kt      | 60 ++++++++++++++++
 .../pl/treksoft/kvision/data/DataUpdatable.kt      |  5 ++
 .../pl/treksoft/kvision/dropdown/DropDown.kt       |  8 +--
 .../pl/treksoft/kvision/form/AbstractText.kt       |  4 +-
 .../pl/treksoft/kvision/form/AbstractTextInput.kt  | 28 ++++----
 .../kotlin/pl/treksoft/kvision/form/CheckBox.kt    |  4 +-
 .../kotlin/pl/treksoft/kvision/form/CheckInput.kt  | 32 ++++++---
 src/main/kotlin/pl/treksoft/kvision/form/Radio.kt  |  4 +-
 src/main/kotlin/pl/treksoft/kvision/html/Link.kt   |  4 +-
 src/main/kotlin/pl/treksoft/kvision/html/List.kt   |  4 +-
 src/main/kotlin/pl/treksoft/kvision/html/Tag.kt    |  4 +-
 src/main/kotlin/pl/treksoft/kvision/modal/Modal.kt | 18 ++---
 .../kotlin/pl/treksoft/kvision/panel/DockPanel.kt  | 13 ++--
 .../kotlin/pl/treksoft/kvision/panel/FlexPanel.kt  | 16 ++---
 .../kotlin/pl/treksoft/kvision/panel/GridPanel.kt  | 17 +++--
 .../treksoft/kvision/panel/ResponsiveGridPanel.kt  | 63 ++++++++---------
 .../pl/treksoft/kvision/panel/SimplePanel.kt       | 59 ++++++++++++++++
 .../kotlin/pl/treksoft/kvision/panel/SplitPanel.kt |  3 +-
 .../kotlin/pl/treksoft/kvision/panel/StackPanel.kt | 11 ++-
 .../kotlin/pl/treksoft/kvision/panel/TabPanel.kt   | 33 +++++++--
 .../test/pl/treksoft/kvision/core/ContainerSpec.kt | 18 ++---
 .../test/pl/treksoft/kvision/core/KVManagerSpec.kt | 16 ++---
 .../test/pl/treksoft/kvision/core/RootSpec.kt      |  4 +-
 28 files changed, 465 insertions(+), 208 deletions(-)
 create mode 100644 src/main/kotlin/pl/treksoft/kvision/data/DataComponent.kt
 create mode 100644 src/main/kotlin/pl/treksoft/kvision/data/DataContainer.kt
 create mode 100644 src/main/kotlin/pl/treksoft/kvision/data/DataUpdatable.kt
 create mode 100644 src/main/kotlin/pl/treksoft/kvision/panel/SimplePanel.kt

(limited to 'src')

diff --git a/src/main/kotlin/pl/treksoft/kvision/Showcase.kt b/src/main/kotlin/pl/treksoft/kvision/Showcase.kt
index f1406505..282ea510 100644
--- a/src/main/kotlin/pl/treksoft/kvision/Showcase.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/Showcase.kt
@@ -1,10 +1,27 @@
 package pl.treksoft.kvision
 
+import com.lightningkite.kotlin.observable.list.observableListOf
 import pl.treksoft.kvision.basic.Label
-import pl.treksoft.kvision.core.*
+import pl.treksoft.kvision.core.BGATTACH
+import pl.treksoft.kvision.core.BGREPEAT
+import pl.treksoft.kvision.core.BGSIZE
+import pl.treksoft.kvision.core.BORDERSTYLE
+import pl.treksoft.kvision.core.Background
+import pl.treksoft.kvision.core.Border
+import pl.treksoft.kvision.core.COLOR
+import pl.treksoft.kvision.core.Img
+import pl.treksoft.kvision.core.Root
+import pl.treksoft.kvision.data.DataComponent
+import pl.treksoft.kvision.data.DataContainer
 import pl.treksoft.kvision.dropdown.DD.*
 import pl.treksoft.kvision.dropdown.DropDown
-import pl.treksoft.kvision.form.*
+import pl.treksoft.kvision.form.CheckBox
+import pl.treksoft.kvision.form.INPUTSIZE
+import pl.treksoft.kvision.form.TEXTINPUTTYPE
+import pl.treksoft.kvision.form.Text
+import pl.treksoft.kvision.form.TextArea
+import pl.treksoft.kvision.form.TextAreaInput
+import pl.treksoft.kvision.form.TextInput
 import pl.treksoft.kvision.html.*
 import pl.treksoft.kvision.html.TAG.DIV
 import pl.treksoft.kvision.html.TAG.H1
@@ -21,7 +38,51 @@ class Showcase : ApplicationBase() {
     override fun start(state: Map<String, Any>) {
         val root = Root("showcase")
 
-        val container = Container(setOf("abc", "def"))
+        class Model(p: Boolean, t: String) : DataComponent() {
+            var p: Boolean by obs(p)
+            var t: String by obs(t)
+        }
+
+        val model = observableListOf(Model(true, "Pierwszy"), Model(false, "Drugi"), Model(false, "Trzeci"))
+        val datac = DataContainer(model, { element, index ->
+            CheckBox(value = element.p,
+                    label = if (element.p) "<b>" + (index + 1) + " " + element.t + "</b>" else element.t,
+                    rich = true).setEventListener<CheckBox>({
+                click = {
+                    element.p = self.value
+                }
+            })
+        })
+        root.add(datac)
+
+        val mbutton = Button("Pokaż wartości").setEventListener<Button> {
+            click = {
+                println(model.collection)
+            }
+            dblclick = {
+                model.add(Model(true, "XXX"))
+            }
+        }
+        root.add(mbutton)
+        val mbutton2 = Button("Zaznacz").setEventListener<Button> {
+            click = {
+                model.forEach { it.p = true }
+            }
+            dblclick = {
+                model.forEach { it.p = false }
+            }
+        }
+        root.add(mbutton2)
+        val textField = TextInput(placeholder = "Wprowadź hasło ...", value = "abc")
+        val mbutton3 = Button("Ukryj/Pokaż").setEventListener<Button> {
+            click = {
+                if (datac.visible) datac.hide() else datac.show()
+                if (textField.visible) textField.hide() else textField.show()
+            }
+        }
+        root.add(mbutton3)
+
+        val container = SimplePanel(setOf("abc", "def"))
         val h1 = Tag(H1, "To jest <i>test pisania</i> tekstu", false, null, classes = setOf("test", "test2"))
         container.add(h1)
         val label = Label("KVLabel1")
@@ -36,7 +97,6 @@ class Showcase : ApplicationBase() {
         link.add(Tag(TAG.P, "Cośtam"))
         root.add(link)
 
-        val textField = TextInput(placeholder = "Wprowadź hasło ...", value = "abc")
         root.add(textField)
         textField.setEventListener<TextInput> {
             input = { e ->
@@ -54,7 +114,7 @@ class Showcase : ApplicationBase() {
         textField2.size = INPUTSIZE.LARGE
         root.add(textField2)
 
-        val checkbox = CheckBox(true, label = "Kliknij aby <b>przetestować</b>", rich = true, circled = true,
+/*        val checkbox = CheckBox(true, label = "Kliknij aby <b>przetestować</b>", rich = true, circled = true,
                 style = CHECKBOXSTYLE.DANGER)
         root.add(checkbox)
         checkbox.setEventListener<CheckBox> {
@@ -62,9 +122,9 @@ class Showcase : ApplicationBase() {
                 println("click" + self.value)
             }
             change = { e -> println("change" + self.value) }
-        }
+        }*/
 
-        val radio = Radio(true, name = "radios", label = "Opcja 1", inline = true,
+/*        val radio = Radio(true, name = "radios", label = "Opcja 1", inline = true,
                 style = RADIOSTYLE.DANGER, extraValue = "o1")
         val radio2 = Radio(false, name = "radios", label = "Opcja 2", rich = true, inline = true,
                 style = RADIOSTYLE.WARNING, extraValue = "o2")
@@ -78,7 +138,7 @@ class Showcase : ApplicationBase() {
                 println("rclick" + self.value)
             }
             change = { e -> println("rchange" + self.value) }
-        }
+        }*/
 
         val text = Text(placeholder = "Pole formularza", maxlength = 5, label = "To jest pole")
         root.add(text)
@@ -258,9 +318,10 @@ class Showcase : ApplicationBase() {
         val button = Button("To jest przycisk FA", "fa-flag", BUTTONSTYLE.DANGER)
         button.setEventListener<Button> {
             click = { _ ->
+                println(model.collection)
                 println(self.text)
                 println(textField.value)
-                println(checkbox.value)
+//                println(checkbox.value)
                 textField2.disabled = false
                 grid4.colorHex = 0xff0000
                 dd3.text = "Zmiana"
@@ -340,7 +401,7 @@ class Showcase : ApplicationBase() {
                     props = snProps("href" to "/foo", "target" to "_blank")
                 }, "I\'ll take you places!")
         ))
-        val v = patch(container, vnode)
+        val v = patch(child, vnode)
         val vnode2 = virtualize("<a href='/top' target='_top'>Test2</a>")
         patch(v, vnode2)*/
     }
diff --git a/src/main/kotlin/pl/treksoft/kvision/core/Container.kt b/src/main/kotlin/pl/treksoft/kvision/core/Container.kt
index df854637..4621a050 100644
--- a/src/main/kotlin/pl/treksoft/kvision/core/Container.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/core/Container.kt
@@ -2,56 +2,13 @@ package pl.treksoft.kvision.core
 
 import com.github.snabbdom.VNode
 
-open class Container(classes: Set<String> = setOf()) : Widget(classes) {
-    internal val children: MutableList<Widget> = mutableListOf()
-
-    override fun render(): VNode {
-        return kvh("div", childrenVNodes())
-    }
-
-    protected open fun childrenVNodes(): Array<VNode> {
-        return children.filter { it.visible }.map { it.renderVNode() }.toTypedArray()
-    }
-
-    protected fun addInternal(child: Widget): Container {
-        children.add(child)
-        child.parent = this
-        refresh()
-        return this
-    }
-
-    open fun add(child: Widget): Container {
-        return addInternal(child)
-    }
-
-    open fun addAll(children: List<Widget>): Container {
-        this.children.addAll(children)
-        children.map { it.parent = this }
-        refresh()
-        return this
-    }
-
-    open fun remove(child: Widget): Container {
-        if (children.remove(child)) {
-            child.clearParent()
-            refresh()
-        }
-        return this
-    }
-
-    open fun removeAll(): Container {
-        children.map { it.clearParent() }
-        children.clear()
-        refresh()
-        return this
-    }
-
-    open fun getChildren(): List<Widget> {
-        return ArrayList(children)
-    }
-
-    override fun dispose() {
-        children.forEach { it.dispose() }
-        removeAll()
-    }
+interface Container {
+    var parent: Widget?
+    var visible: Boolean
+    fun renderVNode(): VNode
+    fun add(child: Widget): Container
+    fun addAll(children: List<Widget>): Container
+    fun remove(child: Widget): Container
+    fun removeAll(): Container
+    fun getChildren(): List<Widget>
 }
diff --git a/src/main/kotlin/pl/treksoft/kvision/core/Root.kt b/src/main/kotlin/pl/treksoft/kvision/core/Root.kt
index 0c8a80f6..9d968874 100644
--- a/src/main/kotlin/pl/treksoft/kvision/core/Root.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/core/Root.kt
@@ -2,12 +2,15 @@ package pl.treksoft.kvision.core
 
 import com.github.snabbdom.VNode
 import pl.treksoft.kvision.modal.Modal
+import pl.treksoft.kvision.panel.SimplePanel
 import pl.treksoft.kvision.snabbdom.StringBoolPair
 
-class Root(id: String, private val fixed: Boolean = false) : Container() {
+class Root(id: String, private val fixed: Boolean = false) : SimplePanel() {
     private val modals: MutableList<Modal> = mutableListOf()
     private var rootVnode: VNode = renderVNode()
 
+    internal var renderDisabled = false
+
     init {
         rootVnode = KVManager.patch(id, this.renderVNode())
         this.id = id
@@ -34,7 +37,9 @@ class Root(id: String, private val fixed: Boolean = false) : Container() {
     }
 
     internal fun reRender(): Root {
-        rootVnode = KVManager.patch(rootVnode, renderVNode())
+        if (!renderDisabled) {
+            rootVnode = KVManager.patch(rootVnode, renderVNode())
+        }
         return this
     }
 
diff --git a/src/main/kotlin/pl/treksoft/kvision/core/Widget.kt b/src/main/kotlin/pl/treksoft/kvision/core/Widget.kt
index d56e7614..6ce1eade 100644
--- a/src/main/kotlin/pl/treksoft/kvision/core/Widget.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/core/Widget.kt
@@ -17,11 +17,12 @@ import pl.treksoft.kvision.snabbdom.snClasses
 import pl.treksoft.kvision.snabbdom.snOpt
 import pl.treksoft.kvision.snabbdom.snStyle
 
-@Suppress("TooManyFunctions")
+@Suppress("TooManyFunctions", "LargeClass")
 open class Widget(classes: Set<String> = setOf()) : StyledComponent() {
 
-    val classes = classes.toMutableSet()
-    val listeners = mutableListOf<SnOn<Widget>.() -> Unit>()
+    internal val classes = classes.toMutableSet()
+    internal val internalListeners = mutableListOf<SnOn<Widget>.() -> Unit>()
+    internal val listeners = mutableListOf<SnOn<Widget>.() -> Unit>()
 
     var parent: Widget? = null
         internal set
@@ -55,7 +56,15 @@ open class Widget(classes: Set<String> = setOf()) : StyledComponent() {
     private var snOnCache: com.github.snabbdom.On? = null
     private var snHooksCache: com.github.snabbdom.Hooks? = null
 
-    internal open fun renderVNode(): VNode {
+    protected fun <T> singleRender(block: () -> T): T {
+        getRoot()?.renderDisabled = true
+        val t = block()
+        getRoot()?.renderDisabled = false
+        getRoot()?.reRender()
+        return t
+    }
+
+    open fun renderVNode(): VNode {
         return render()
     }
 
@@ -132,9 +141,47 @@ open class Widget(classes: Set<String> = setOf()) : StyledComponent() {
     }
 
     protected open fun getSnOn(): com.github.snabbdom.On? {
-        return if (listeners.size > 0) {
+        return if (internalListeners.size > 0 || listeners.size > 0) {
+            val internalHandlers = on(this)
+            internalListeners.forEach { l -> (internalHandlers::apply)(l) }
             val handlers = on(this)
             listeners.forEach { l -> (handlers::apply)(l) }
+            if (internalHandlers.click != null) {
+                if (handlers.click == null) {
+                    handlers.click = internalHandlers.click
+                } 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)
+                    }
+                }
+            }
             handlers
         } else {
             null
@@ -144,13 +191,21 @@ open class Widget(classes: Set<String> = setOf()) : StyledComponent() {
     protected open fun getSnHooks(): com.github.snabbdom.Hooks? {
         val hooks = hooks()
         hooks.apply {
+            create = { _, v ->
+                vnode = v
+                afterCreate(v)
+            }
             insert = { v ->
                 vnode = v
                 afterInsert(v)
             }
             postpatch = { ov, v ->
                 vnode = v
-                if (ov.elm !== v.elm) afterInsert(v)
+                if (ov.elm !== v.elm) {
+                    afterInsert(v)
+                } else {
+                    afterPostpatch(v)
+                }
             }
             destroy = { _ ->
                 vnode = null
@@ -160,6 +215,12 @@ open class Widget(classes: Set<String> = setOf()) : StyledComponent() {
         return hooks
     }
 
+    protected fun setInternalEventListener(block: SnOn<Widget>.() -> Unit): Widget {
+        internalListeners.add(block)
+        refresh()
+        return this
+    }
+
     @Suppress("UNCHECKED_CAST")
     open fun <T : Widget> setEventListener(block: SnOn<T>.() -> Unit): Widget {
         listeners.add(block as SnOn<Widget>.() -> Unit)
@@ -228,9 +289,15 @@ open class Widget(classes: Set<String> = setOf()) : StyledComponent() {
         return this
     }
 
+    protected open fun afterCreate(node: VNode) {
+    }
+
     protected open fun afterInsert(node: VNode) {
     }
 
+    protected open fun afterPostpatch(node: VNode) {
+    }
+
     protected open fun afterDestroy() {
     }
 
diff --git a/src/main/kotlin/pl/treksoft/kvision/data/DataComponent.kt b/src/main/kotlin/pl/treksoft/kvision/data/DataComponent.kt
new file mode 100644
index 00000000..605e1e2e
--- /dev/null
+++ b/src/main/kotlin/pl/treksoft/kvision/data/DataComponent.kt
@@ -0,0 +1,15 @@
+package pl.treksoft.kvision.data
+
+import kotlin.properties.ObservableProperty
+import kotlin.properties.ReadWriteProperty
+import kotlin.reflect.KProperty
+
+open class DataComponent {
+    var container: DataUpdatable? = null
+
+    fun <T> obs(initialValue: T): ReadWriteProperty<Any?, T> = object : ObservableProperty<T>(initialValue) {
+        override fun afterChange(property: KProperty<*>, oldValue: T, newValue: T) {
+            container?.update()
+        }
+    }
+}
diff --git a/src/main/kotlin/pl/treksoft/kvision/data/DataContainer.kt b/src/main/kotlin/pl/treksoft/kvision/data/DataContainer.kt
new file mode 100644
index 00000000..3b6d3aa8
--- /dev/null
+++ b/src/main/kotlin/pl/treksoft/kvision/data/DataContainer.kt
@@ -0,0 +1,60 @@
+package pl.treksoft.kvision.data
+
+import com.github.snabbdom.VNode
+import com.lightningkite.kotlin.observable.list.ObservableList
+import pl.treksoft.kvision.core.Container
+import pl.treksoft.kvision.core.Widget
+import pl.treksoft.kvision.panel.VPanel
+
+class DataContainer<M : DataComponent, C : Widget>(val model: ObservableList<M>,
+                                                        private val binding: (M, Int) -> C,
+                                                        private val child: Container = VPanel()) :
+        Widget(setOf()), Container, DataUpdatable {
+
+    override var visible
+        get() = child.visible
+        set(value) {
+            child.visible = value
+        }
+
+    init {
+        child.parent = this
+        model.onUpdate += { _ ->
+            update()
+        }
+        update()
+    }
+
+    override fun add(child: Widget): Container {
+        return this.child.add(child)
+    }
+
+    override fun addAll(children: List<Widget>): Container {
+        return this.child.addAll(children)
+    }
+
+    override fun remove(child: Widget): Container {
+        return this.child.remove(child)
+    }
+
+    override fun removeAll(): Container {
+        return this.child.removeAll()
+    }
+
+    override fun getChildren(): List<Widget> {
+        return this.child.getChildren()
+    }
+
+    override fun renderVNode(): VNode {
+        return this.child.renderVNode()
+    }
+
+    override fun update() {
+        model.forEach { it.container = this }
+        singleRender {
+            child.removeAll()
+            child.addAll(model.mapIndexed { index, m -> binding(m, index) })
+        }
+    }
+
+}
diff --git a/src/main/kotlin/pl/treksoft/kvision/data/DataUpdatable.kt b/src/main/kotlin/pl/treksoft/kvision/data/DataUpdatable.kt
new file mode 100644
index 00000000..5f9b7563
--- /dev/null
+++ b/src/main/kotlin/pl/treksoft/kvision/data/DataUpdatable.kt
@@ -0,0 +1,5 @@
+package pl.treksoft.kvision.data
+
+interface DataUpdatable {
+    fun update()
+}
diff --git a/src/main/kotlin/pl/treksoft/kvision/dropdown/DropDown.kt b/src/main/kotlin/pl/treksoft/kvision/dropdown/DropDown.kt
index 92f06591..1ba20211 100644
--- a/src/main/kotlin/pl/treksoft/kvision/dropdown/DropDown.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/dropdown/DropDown.kt
@@ -1,7 +1,7 @@
 package pl.treksoft.kvision.dropdown
 
 import com.github.snabbdom.VNode
-import pl.treksoft.kvision.core.Container
+import pl.treksoft.kvision.panel.SimplePanel
 import pl.treksoft.kvision.core.ResString
 import pl.treksoft.kvision.core.Widget
 import pl.treksoft.kvision.html.BUTTONSTYLE
@@ -23,7 +23,7 @@ enum class DD(val type: String) {
 
 open class DropDown(text: String, elements: List<StringPair>? = null, icon: String? = null,
                     style: BUTTONSTYLE = BUTTONSTYLE.DEFAULT, disabled: Boolean = false, image: ResString? = null,
-                    dropup: Boolean = false, classes: Set<String> = setOf()) : Container(classes) {
+                    dropup: Boolean = false, classes: Set<String> = setOf()) : SimplePanel(classes) {
     var text
         get() = button.text
         set(value) {
@@ -93,12 +93,12 @@ open class DropDown(text: String, elements: List<StringPair>? = null, icon: Stri
         var counter = 0
     }
 
-    override fun add(child: Widget): Container {
+    override fun add(child: Widget): SimplePanel {
         list.add(child)
         return this
     }
 
-    override fun addAll(children: List<Widget>): Container {
+    override fun addAll(children: List<Widget>): SimplePanel {
         list.addAll(children)
         return this
     }
diff --git a/src/main/kotlin/pl/treksoft/kvision/form/AbstractText.kt b/src/main/kotlin/pl/treksoft/kvision/form/AbstractText.kt
index 98619dbc..dfa4233b 100644
--- a/src/main/kotlin/pl/treksoft/kvision/form/AbstractText.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/form/AbstractText.kt
@@ -1,11 +1,11 @@
 package pl.treksoft.kvision.form
 
-import pl.treksoft.kvision.core.Container
+import pl.treksoft.kvision.panel.SimplePanel
 import pl.treksoft.kvision.core.Widget
 import pl.treksoft.kvision.snabbdom.SnOn
 
 abstract class AbstractText(label: String? = null, rich: Boolean = false) :
-        Container(setOf("form-group")), StringFormField {
+        SimplePanel(setOf("form-group")), StringFormField {
 
     override var value
         get() = input.value
diff --git a/src/main/kotlin/pl/treksoft/kvision/form/AbstractTextInput.kt b/src/main/kotlin/pl/treksoft/kvision/form/AbstractTextInput.kt
index 017e7fef..82846012 100644
--- a/src/main/kotlin/pl/treksoft/kvision/form/AbstractTextInput.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/form/AbstractTextInput.kt
@@ -1,16 +1,25 @@
 package pl.treksoft.kvision.form
 
-import com.github.snabbdom.VNode
 import pl.treksoft.kvision.core.Widget
 import pl.treksoft.kvision.snabbdom.StringBoolPair
 import pl.treksoft.kvision.snabbdom.StringPair
 
 abstract class AbstractTextInput(placeholder: String? = null,
-                override var value: String? = null, name: String? = null, maxlength: Int? = null,
-                disabled: Boolean = false, id: String? = null,
-                classes: Set<String> = setOf()) : Widget(classes + "form-control"), StringFormField {
+                                 override var value: String? = null, name: String? = null, maxlength: Int? = null,
+                                 disabled: Boolean = false, id: String? = null,
+                                 classes: Set<String> = setOf()) : Widget(classes + "form-control"), StringFormField {
     init {
         this.id = id
+        this.setInternalEventListener {
+            input = {
+                val v = getElementJQuery()?.`val`() as String?
+                if (v != null && v.isNotEmpty()) {
+                    value = v
+                } else {
+                    value = null
+                }
+            }
+        }
     }
 
     @Suppress("LeakingThis")
@@ -90,15 +99,4 @@ abstract class AbstractTextInput(placeholder: String? = null,
         }
         return sn
     }
-
-    override fun afterInsert(node: VNode) {
-        this.getElementJQuery()?.on("input", { _, _ ->
-            val v = getElementJQuery()?.`val`() as String?
-            if (v != null && v.isNotEmpty()) {
-                value = v
-            } else {
-                value = null
-            }
-        })
-    }
 }
diff --git a/src/main/kotlin/pl/treksoft/kvision/form/CheckBox.kt b/src/main/kotlin/pl/treksoft/kvision/form/CheckBox.kt
index 325c1982..65941495 100644
--- a/src/main/kotlin/pl/treksoft/kvision/form/CheckBox.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/form/CheckBox.kt
@@ -1,6 +1,6 @@
 package pl.treksoft.kvision.form
 
-import pl.treksoft.kvision.core.Container
+import pl.treksoft.kvision.panel.SimplePanel
 import pl.treksoft.kvision.core.Widget
 import pl.treksoft.kvision.snabbdom.SnOn
 import pl.treksoft.kvision.snabbdom.StringBoolPair
@@ -16,7 +16,7 @@ enum class CHECKBOXSTYLE(val className: String) {
 
 open class CheckBox(value: Boolean = false, name: String? = null, style: CHECKBOXSTYLE? = null,
                     circled: Boolean = false, inline: Boolean = false, disabled: Boolean = false,
-                    label: String? = null, rich: Boolean = false) : Container(setOf("checkbox")), BoolFormField {
+                    label: String? = null, rich: Boolean = false) : SimplePanel(setOf("checkbox")), BoolFormField {
 
     override var value
         get() = input.value
diff --git a/src/main/kotlin/pl/treksoft/kvision/form/CheckInput.kt b/src/main/kotlin/pl/treksoft/kvision/form/CheckInput.kt
index 131793b8..07008ddd 100644
--- a/src/main/kotlin/pl/treksoft/kvision/form/CheckInput.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/form/CheckInput.kt
@@ -17,6 +17,16 @@ open class CheckInput(type: CHECKINPUTTYPE = CHECKINPUTTYPE.CHECKBOX, override v
 
     init {
         this.id = id
+        this.setInternalEventListener {
+            click = {
+                val v = getElementJQuery()?.prop("checked") as Boolean?
+                value = (v == true)
+            }
+            change = {
+                val v = getElementJQuery()?.prop("checked") as Boolean?
+                value = (v == true)
+            }
+        }
     }
 
     @Suppress("LeakingThis")
@@ -83,15 +93,17 @@ open class CheckInput(type: CHECKINPUTTYPE = CHECKINPUTTYPE.CHECKBOX, override v
     }
 
     override fun afterInsert(node: VNode) {
-        this.getElementJQuery()?.on("change", { _, _ ->
-            val v = getElementJQuery()?.prop("checked") as Boolean?
-            value = (v == true)
-            true
-        })
-        this.getElementJQuery()?.on("click", { _, _ ->
-            val v = getElementJQuery()?.prop("checked") as Boolean?
-            value = (v == true)
-            true
-        })
+        refreshCheckedState()
+    }
+
+    override fun afterPostpatch(node: VNode) {
+        refreshCheckedState()
+    }
+
+    private fun refreshCheckedState() {
+        val v = getElementJQuery()?.prop("checked") as Boolean?
+        if (this.value != v) {
+            getElementJQuery()?.prop("checked", this.value)
+        }
     }
 }
diff --git a/src/main/kotlin/pl/treksoft/kvision/form/Radio.kt b/src/main/kotlin/pl/treksoft/kvision/form/Radio.kt
index eebbe65a..66c2d75c 100644
--- a/src/main/kotlin/pl/treksoft/kvision/form/Radio.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/form/Radio.kt
@@ -1,6 +1,6 @@
 package pl.treksoft.kvision.form
 
-import pl.treksoft.kvision.core.Container
+import pl.treksoft.kvision.panel.SimplePanel
 import pl.treksoft.kvision.core.Widget
 import pl.treksoft.kvision.snabbdom.SnOn
 import pl.treksoft.kvision.snabbdom.StringBoolPair
@@ -16,7 +16,7 @@ enum class RADIOSTYLE(val className: String) {
 
 open class Radio(value: Boolean = false, extraValue: String? = null, name: String? = null, style: RADIOSTYLE? = null,
                  squared: Boolean = false, inline: Boolean = false, disabled: Boolean = false,
-                 label: String? = null, rich: Boolean = false) : Container(), BoolFormField {
+                 label: String? = null, rich: Boolean = false) : SimplePanel(), BoolFormField {
 
     override var value
         get() = input.value
diff --git a/src/main/kotlin/pl/treksoft/kvision/html/Link.kt b/src/main/kotlin/pl/treksoft/kvision/html/Link.kt
index dc93d0e7..f103323b 100644
--- a/src/main/kotlin/pl/treksoft/kvision/html/Link.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/html/Link.kt
@@ -1,12 +1,12 @@
 package pl.treksoft.kvision.html
 
 import com.github.snabbdom.VNode
-import pl.treksoft.kvision.core.Container
+import pl.treksoft.kvision.panel.SimplePanel
 import pl.treksoft.kvision.core.ResString
 import pl.treksoft.kvision.snabbdom.StringPair
 
 open class Link(label: String, url: String, icon: String? = null, image: ResString? = null,
-                classes: Set<String> = setOf()) : Container(classes) {
+                classes: Set<String> = setOf()) : SimplePanel(classes) {
     private var label = label
         set(value) {
             field = value
diff --git a/src/main/kotlin/pl/treksoft/kvision/html/List.kt b/src/main/kotlin/pl/treksoft/kvision/html/List.kt
index 9bac3f41..40ebc50b 100644
--- a/src/main/kotlin/pl/treksoft/kvision/html/List.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/html/List.kt
@@ -2,7 +2,7 @@ package pl.treksoft.kvision.html
 
 import com.github.snabbdom.VNode
 import com.github.snabbdom.h
-import pl.treksoft.kvision.core.Container
+import pl.treksoft.kvision.panel.SimplePanel
 import pl.treksoft.kvision.core.KVManager
 import pl.treksoft.kvision.snabbdom.StringBoolPair
 
@@ -16,7 +16,7 @@ enum class LIST(val tagName: String) {
 }
 
 open class ListTag(type: LIST, elements: List<String>? = null, rich: Boolean = false,
-                   classes: Set<String> = setOf()) : Container(classes) {
+                   classes: Set<String> = setOf()) : SimplePanel(classes) {
     var type = type
         set(value) {
             field = value
diff --git a/src/main/kotlin/pl/treksoft/kvision/html/Tag.kt b/src/main/kotlin/pl/treksoft/kvision/html/Tag.kt
index 70725d97..71856627 100644
--- a/src/main/kotlin/pl/treksoft/kvision/html/Tag.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/html/Tag.kt
@@ -1,7 +1,7 @@
 package pl.treksoft.kvision.html
 
 import com.github.snabbdom.VNode
-import pl.treksoft.kvision.core.Container
+import pl.treksoft.kvision.panel.SimplePanel
 import pl.treksoft.kvision.core.KVManager
 import pl.treksoft.kvision.snabbdom.StringBoolPair
 
@@ -50,7 +50,7 @@ enum class ALIGN(val className: String) {
 }
 
 open class Tag(type: TAG, text: String? = null, rich: Boolean = false, align: ALIGN? = null,
-               classes: Set<String> = setOf()) : Container(classes) {
+               classes: Set<String> = setOf()) : SimplePanel(classes) {
     var type = type
         set(value) {
             field = value
diff --git a/src/main/kotlin/pl/treksoft/kvision/modal/Modal.kt b/src/main/kotlin/pl/treksoft/kvision/modal/Modal.kt
index 94796326..a4e14d5c 100644
--- a/src/main/kotlin/pl/treksoft/kvision/modal/Modal.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/modal/Modal.kt
@@ -1,7 +1,7 @@
 package pl.treksoft.kvision.modal
 
 import com.github.snabbdom.VNode
-import pl.treksoft.kvision.core.Container
+import pl.treksoft.kvision.panel.SimplePanel
 import pl.treksoft.kvision.core.Root
 import pl.treksoft.kvision.core.Widget
 import pl.treksoft.kvision.helpers.CloseIcon
@@ -20,7 +20,7 @@ enum class MODALSIZE(val className: String) {
 @Suppress("TooManyFunctions")
 open class Modal(caption: String? = null, closeButton: Boolean = true,
                  size: MODALSIZE? = null, animation: Boolean = true, private val escape: Boolean = true,
-                 classes: Set<String> = setOf()) : Container(classes) {
+                 classes: Set<String> = setOf()) : SimplePanel(classes) {
     private var caption
         get() = captionTag.text
         set(value) {
@@ -45,17 +45,17 @@ open class Modal(caption: String? = null, closeButton: Boolean = true,
         }
 
     private val dialog = ModalDialog(size)
-    private val header = Container(setOf("modal-header"))
+    private val header = SimplePanel(setOf("modal-header"))
     protected val closeIcon = CloseIcon()
     private val captionTag = Tag(TAG.H4, caption, classes = setOf("modal-title"))
-    protected val body = Container(setOf("modal-body"))
-    private val footer = Container(setOf("modal-footer"))
+    protected val body = SimplePanel(setOf("modal-body"))
+    private val footer = SimplePanel(setOf("modal-footer"))
 
     init {
         this.hide()
         this.role = "dialog"
         this.addInternal(dialog)
-        val content = Container(setOf("modal-content"))
+        val content = SimplePanel(setOf("modal-content"))
         dialog.role = "document"
         dialog.add(content)
         closeIcon.visible = closeButton
@@ -87,12 +87,12 @@ open class Modal(caption: String? = null, closeButton: Boolean = true,
         }
     }
 
-    override fun add(child: Widget): Container {
+    override fun add(child: Widget): SimplePanel {
         body.add(child)
         return this
     }
 
-    override fun addAll(children: List<Widget>): Container {
+    override fun addAll(children: List<Widget>): SimplePanel {
         body.addAll(children)
         return this
     }
@@ -171,7 +171,7 @@ open class Modal(caption: String? = null, closeButton: Boolean = true,
     }
 }
 
-open class ModalDialog(size: MODALSIZE?) : Container(setOf("modal-dialog")) {
+open class ModalDialog(size: MODALSIZE?) : SimplePanel(setOf("modal-dialog")) {
     var size = size
         set(value) {
             field = value
diff --git a/src/main/kotlin/pl/treksoft/kvision/panel/DockPanel.kt b/src/main/kotlin/pl/treksoft/kvision/panel/DockPanel.kt
index 6d86727c..6e037c28 100644
--- a/src/main/kotlin/pl/treksoft/kvision/panel/DockPanel.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/panel/DockPanel.kt
@@ -1,6 +1,5 @@
 package pl.treksoft.kvision.panel
 
-import pl.treksoft.kvision.core.Container
 import pl.treksoft.kvision.core.Widget
 
 enum class SIDE {
@@ -11,7 +10,7 @@ enum class SIDE {
     DOWN
 }
 
-open class DockPanel(classes: Set<String> = setOf()) : Container(classes = classes) {
+open class DockPanel(classes: Set<String> = setOf()) : SimplePanel(classes = classes) {
     protected var left: Widget? = null
     protected var center: Widget? = null
     protected var right: Widget? = null
@@ -59,16 +58,16 @@ open class DockPanel(classes: Set<String> = setOf()) : Container(classes = class
         return this
     }
 
-    override fun add(child: Widget): Container {
+    override fun add(child: Widget): DockPanel {
         return this.add(child, SIDE.CENTER)
     }
 
-    override fun addAll(children: List<Widget>): Container {
+    override fun addAll(children: List<Widget>): DockPanel {
         children.forEach { this.add(it) }
         return this
     }
 
-    override fun remove(child: Widget): Container {
+    override fun remove(child: Widget): DockPanel {
         if (child == left) removeAt(SIDE.LEFT)
         if (child == center) removeAt(SIDE.CENTER)
         if (child == right) removeAt(SIDE.RIGHT)
@@ -77,7 +76,7 @@ open class DockPanel(classes: Set<String> = setOf()) : Container(classes = class
         return this
     }
 
-    open fun removeAt(position: SIDE): Container {
+    open fun removeAt(position: SIDE): DockPanel {
         when (position) {
             SIDE.UP -> {
                 up?.let { mainContainer.remove(it) }
@@ -103,7 +102,7 @@ open class DockPanel(classes: Set<String> = setOf()) : Container(classes = class
         return this
     }
 
-    override fun removeAll(): Container {
+    override fun removeAll(): DockPanel {
         removeAt(SIDE.LEFT)
         removeAt(SIDE.CENTER)
         removeAt(SIDE.RIGHT)
diff --git a/src/main/kotlin/pl/treksoft/kvision/panel/FlexPanel.kt b/src/main/kotlin/pl/treksoft/kvision/panel/FlexPanel.kt
index 10483a8d..6b6e11fb 100644
--- a/src/main/kotlin/pl/treksoft/kvision/panel/FlexPanel.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/panel/FlexPanel.kt
@@ -1,6 +1,5 @@
 package pl.treksoft.kvision.panel
 
-import pl.treksoft.kvision.core.Container
 import pl.treksoft.kvision.core.Widget
 import pl.treksoft.kvision.core.WidgetWrapper
 import pl.treksoft.kvision.snabbdom.StringPair
@@ -46,7 +45,7 @@ enum class FLEXALIGNCONTENT(val alignContent: String) {
 
 open class FlexPanel(direction: FLEXDIR? = null, wrap: FLEXWRAP? = null, justify: FLEXJUSTIFY? = null,
                      alignItems: FLEXALIGNITEMS? = null, alignContent: FLEXALIGNCONTENT? = null,
-                     classes: Set<String> = setOf()) : Container(classes) {
+                     classes: Set<String> = setOf()) : SimplePanel(classes) {
     var direction = direction
         set(value) {
             field = value
@@ -75,20 +74,21 @@ open class FlexPanel(direction: FLEXDIR? = null, wrap: FLEXWRAP? = null, justify
 
     @Suppress("LongParameterList")
     fun add(child: Widget, order: Int? = null, grow: Int? = null, shrink: Int? = null,
-            basis: Int? = null, alignSelf: FLEXALIGNITEMS? = null, classes: Set<String> = setOf()): Container {
-        return addInternal(FlexWrapper(child, order, grow, shrink, basis, alignSelf, classes))
+            basis: Int? = null, alignSelf: FLEXALIGNITEMS? = null, classes: Set<String> = setOf()): FlexPanel {
+        addInternal(FlexWrapper(child, order, grow, shrink, basis, alignSelf, classes))
+        return this
     }
 
-    override fun add(child: Widget): Container {
+    override fun add(child: Widget): FlexPanel {
         return add(child, null)
     }
 
-    override fun addAll(children: List<Widget>): Container {
+    override fun addAll(children: List<Widget>): FlexPanel {
         children.forEach { add(it, null) }
         return this
     }
 
-    override fun remove(child: Widget): Container {
+    override fun remove(child: Widget): FlexPanel {
         children.find { (it as FlexWrapper).delegate == child }?.let {
             super.remove(it)
             it.dispose()
@@ -96,7 +96,7 @@ open class FlexPanel(direction: FLEXDIR? = null, wrap: FLEXWRAP? = null, justify
         return this
     }
 
-    override fun removeAll(): Container {
+    override fun removeAll(): FlexPanel {
         children.map {
             it.clearParent()
             it.dispose()
diff --git a/src/main/kotlin/pl/treksoft/kvision/panel/GridPanel.kt b/src/main/kotlin/pl/treksoft/kvision/panel/GridPanel.kt
index 44ba509f..cac5c79b 100644
--- a/src/main/kotlin/pl/treksoft/kvision/panel/GridPanel.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/panel/GridPanel.kt
@@ -1,6 +1,5 @@
 package pl.treksoft.kvision.panel
 
-import pl.treksoft.kvision.core.Container
 import pl.treksoft.kvision.core.Widget
 import pl.treksoft.kvision.core.WidgetWrapper
 import pl.treksoft.kvision.snabbdom.StringPair
@@ -50,7 +49,7 @@ open class GridPanel(autoColumns: String? = null, autoRows: String? = null, auto
                      templateColumns: String? = null, templateRows: String? = null, templateAreas: List<String>? = null,
                      columnGap: Int? = null, rowGap: Int? = null, justifyItems: GRIDJUSTIFY? = null,
                      alignItems: GRIDALIGN? = null, justifyContent: GRIDJUSTIFYCONTENT? = null,
-                     alignContent: GRIDALIGNCONTENT? = null, classes: Set<String> = setOf()) : Container(classes) {
+                     alignContent: GRIDALIGNCONTENT? = null, classes: Set<String> = setOf()) : SimplePanel(classes) {
     var autoColumns = autoColumns
         set(value) {
             field = value
@@ -115,21 +114,21 @@ open class GridPanel(autoColumns: String? = null, autoRows: String? = null, auto
     @Suppress("LongParameterList")
     fun add(child: Widget, columnStart: Int? = null, rowStart: Int? = null,
             columnEnd: String? = null, rowEnd: String? = null, area: String? = null, justifySelf: GRIDJUSTIFY? = null,
-            alignSelf: GRIDALIGN? = null, classes: Set<String> = setOf()): Container {
-        return addInternal(GridWrapper(child, columnStart, rowStart, columnEnd, rowEnd, area, justifySelf,
-                alignSelf, classes))
+            alignSelf: GRIDALIGN? = null, classes: Set<String> = setOf()): GridPanel {
+        addInternal(GridWrapper(child, columnStart, rowStart, columnEnd, rowEnd, area, justifySelf, alignSelf, classes))
+        return this
     }
 
-    override fun add(child: Widget): Container {
+    override fun add(child: Widget): GridPanel {
         return add(child, null, null)
     }
 
-    override fun addAll(children: List<Widget>): Container {
+    override fun addAll(children: List<Widget>): GridPanel {
         children.forEach { add(it, null, null) }
         return this
     }
 
-    override fun remove(child: Widget): Container {
+    override fun remove(child: Widget): GridPanel {
         children.find { (it as GridWrapper).delegate == child }?.let {
             super.remove(it)
             it.dispose()
@@ -137,7 +136,7 @@ open class GridPanel(autoColumns: String? = null, autoRows: String? = null, auto
         return this
     }
 
-    override fun removeAll(): Container {
+    override fun removeAll(): GridPanel {
         children.map {
             it.clearParent()
             it.dispose()
diff --git a/src/main/kotlin/pl/treksoft/kvision/panel/ResponsiveGridPanel.kt b/src/main/kotlin/pl/treksoft/kvision/panel/ResponsiveGridPanel.kt
index 17b3803f..3587ea8e 100644
--- a/src/main/kotlin/pl/treksoft/kvision/panel/ResponsiveGridPanel.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/panel/ResponsiveGridPanel.kt
@@ -1,6 +1,5 @@
 package pl.treksoft.kvision.panel
 
-import pl.treksoft.kvision.core.Container
 import pl.treksoft.kvision.core.Widget
 import pl.treksoft.kvision.core.WidgetWrapper
 import pl.treksoft.kvision.html.ALIGN
@@ -20,7 +19,7 @@ internal data class WidgetParam(val widget: Widget, val size: Int, val offset: I
 
 open class ResponsiveGridPanel(private val gridsize: GRIDSIZE = GRIDSIZE.MD,
                                private var rows: Int = 0, private var cols: Int = 0, align: ALIGN? = null,
-                               classes: Set<String> = setOf()) : Container(classes) {
+                               classes: Set<String> = setOf()) : SimplePanel(classes) {
     protected var align = align
         set(value) {
             field = value
@@ -30,7 +29,7 @@ open class ResponsiveGridPanel(private val gridsize: GRIDSIZE = GRIDSIZE.MD,
     internal val map = mutableMapOf<Int, MutableMap<Int, WidgetParam>>()
     private var auto: Boolean = true
 
-    open fun add(child: Widget, row: Int, col: Int, size: Int = 0, offset: Int = 0): Container {
+    open fun add(child: Widget, row: Int, col: Int, size: Int = 0, offset: Int = 0): ResponsiveGridPanel {
         val cRow = if (row < 0) 0 else row
         val cCol = if (col < 0) 0 else col
         if (row > rows - 1) rows = cRow + 1
@@ -41,17 +40,17 @@ open class ResponsiveGridPanel(private val gridsize: GRIDSIZE = GRIDSIZE.MD,
         return this
     }
 
-    override fun add(child: Widget): Container {
+    override fun add(child: Widget): ResponsiveGridPanel {
         return this.add(child, 0, this.cols)
     }
 
-    override fun addAll(children: List<Widget>): Container {
+    override fun addAll(children: List<Widget>): ResponsiveGridPanel {
         children.forEach { this.add(it) }
         return this
     }
 
     @Suppress("NestedBlockDepth")
-    override fun remove(child: Widget): Container {
+    override fun remove(child: Widget): ResponsiveGridPanel {
         for (i in 0 until rows) {
             val row = map[i]
             if (row != null) {
@@ -67,7 +66,7 @@ open class ResponsiveGridPanel(private val gridsize: GRIDSIZE = GRIDSIZE.MD,
         return this
     }
 
-    open fun removeAt(row: Int, col: Int): Container {
+    open fun removeAt(row: Int, col: Int): ResponsiveGridPanel {
         map[row]?.remove(col)
         refreshRowContainers()
         return this
@@ -75,38 +74,40 @@ open class ResponsiveGridPanel(private val gridsize: GRIDSIZE = GRIDSIZE.MD,
 
     @Suppress("ComplexMethod", "NestedBlockDepth")
     protected open fun refreshRowContainers() {
-        clearRowContainers()
-        val num = MAX_COLUMNS / cols
-        for (i in 0 until rows) {
-            val rowContainer = Container(setOf("row"))
-            val row = map[i]
-            if (row != null) {
-                for (j in 0 until cols) {
-                    val wp = row[j]
-                    if (auto) {
-                        val widget = wp?.widget?.let {
-                            WidgetWrapper(it, setOf("col-" + gridsize.size + "-" + num))
-                        } ?: Tag(TAG.DIV, classes = setOf("col-" + gridsize.size + "-" + num))
-                        align?.let {
-                            widget.addCssClass(it.className)
-                        }
-                        rowContainer.add(widget)
-                    } else {
-                        if (wp != null) {
-                            val s = if (wp.size > 0) wp.size else num
-                            val widget = WidgetWrapper(wp.widget, setOf("col-" + gridsize.size + "-" + s))
-                            if (wp.offset > 0) {
-                                widget.addCssClass("col-" + gridsize.size + "-offset-" + wp.offset)
-                            }
+        singleRender {
+            clearRowContainers()
+            val num = MAX_COLUMNS / cols
+            for (i in 0 until rows) {
+                val rowContainer = SimplePanel(setOf("row"))
+                val row = map[i]
+                if (row != null) {
+                    for (j in 0 until cols) {
+                        val wp = row[j]
+                        if (auto) {
+                            val widget = wp?.widget?.let {
+                                WidgetWrapper(it, setOf("col-" + gridsize.size + "-" + num))
+                            } ?: Tag(TAG.DIV, classes = setOf("col-" + gridsize.size + "-" + num))
                             align?.let {
                                 widget.addCssClass(it.className)
                             }
                             rowContainer.add(widget)
+                        } else {
+                            if (wp != null) {
+                                val s = if (wp.size > 0) wp.size else num
+                                val widget = WidgetWrapper(wp.widget, setOf("col-" + gridsize.size + "-" + s))
+                                if (wp.offset > 0) {
+                                    widget.addCssClass("col-" + gridsize.size + "-offset-" + wp.offset)
+                                }
+                                align?.let {
+                                    widget.addCssClass(it.className)
+                                }
+                                rowContainer.add(widget)
+                            }
                         }
                     }
                 }
+                addInternal(rowContainer)
             }
-            addInternal(rowContainer)
         }
     }
 
diff --git a/src/main/kotlin/pl/treksoft/kvision/panel/SimplePanel.kt b/src/main/kotlin/pl/treksoft/kvision/panel/SimplePanel.kt
new file mode 100644
index 00000000..e9cf503b
--- /dev/null
+++ b/src/main/kotlin/pl/treksoft/kvision/panel/SimplePanel.kt
@@ -0,0 +1,59 @@
+package pl.treksoft.kvision.panel
+
+import com.github.snabbdom.VNode
+import pl.treksoft.kvision.core.Container
+import pl.treksoft.kvision.core.Widget
+
+open class SimplePanel(classes: Set<String> = setOf()) : Widget(classes), Container {
+    internal val children: MutableList<Widget> = mutableListOf()
+
+    override fun render(): VNode {
+        return kvh("div", childrenVNodes())
+    }
+
+    protected open fun childrenVNodes(): Array<VNode> {
+        return children.filter { it.visible }.map { it.renderVNode() }.toTypedArray()
+    }
+
+    protected fun addInternal(child: Widget): SimplePanel {
+        children.add(child)
+        child.parent = this
+        refresh()
+        return this
+    }
+
+    override fun add(child: Widget): SimplePanel {
+        return addInternal(child)
+    }
+
+    override fun addAll(children: List<Widget>): SimplePanel {
+        this.children.addAll(children)
+        children.map { it.parent = this }
+        refresh()
+        return this
+    }
+
+    override fun remove(child: Widget): SimplePanel {
+        if (children.remove(child)) {
+            child.clearParent()
+            refresh()
+        }
+        return this
+    }
+
+    override fun removeAll(): SimplePanel {
+        children.map { it.clearParent() }
+        children.clear()
+        refresh()
+        return this
+    }
+
+    override fun getChildren(): List<Widget> {
+        return ArrayList(children)
+    }
+
+    override fun dispose() {
+        children.forEach { it.dispose() }
+        removeAll()
+    }
+}
diff --git a/src/main/kotlin/pl/treksoft/kvision/panel/SplitPanel.kt b/src/main/kotlin/pl/treksoft/kvision/panel/SplitPanel.kt
index 03740222..02811639 100644
--- a/src/main/kotlin/pl/treksoft/kvision/panel/SplitPanel.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/panel/SplitPanel.kt
@@ -3,7 +3,6 @@ package pl.treksoft.kvision.panel
 import com.github.snabbdom.VNode
 import pl.treksoft.jquery.JQuery
 import pl.treksoft.jquery.JQueryEventObject
-import pl.treksoft.kvision.core.Container
 import pl.treksoft.kvision.core.UNIT
 import pl.treksoft.kvision.html.TAG
 import pl.treksoft.kvision.html.Tag
@@ -15,7 +14,7 @@ enum class DIRECTION(val dir: String) {
 }
 
 open class SplitPanel(private val direction: DIRECTION = DIRECTION.VERTICAL,
-                      classes: Set<String> = setOf()) : Container(classes + ("splitpanel-" + direction.dir)) {
+                      classes: Set<String> = setOf()) : SimplePanel(classes + ("splitpanel-" + direction.dir)) {
 
     @Suppress("LeakingThis")
     internal val splitter = Splitter(this, direction)
diff --git a/src/main/kotlin/pl/treksoft/kvision/panel/StackPanel.kt b/src/main/kotlin/pl/treksoft/kvision/panel/StackPanel.kt
index c5162c0a..e8975dce 100644
--- a/src/main/kotlin/pl/treksoft/kvision/panel/StackPanel.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/panel/StackPanel.kt
@@ -1,11 +1,10 @@
 package pl.treksoft.kvision.panel
 
 import com.github.snabbdom.VNode
-import pl.treksoft.kvision.core.Container
 import pl.treksoft.kvision.core.Widget
 
 open class StackPanel(private val activateLast: Boolean = true,
-                      classes: Set<String> = setOf()) : Container(classes) {
+                      classes: Set<String> = setOf()) : SimplePanel(classes) {
     var activeIndex = -1
         set(value) {
             field = value
@@ -20,27 +19,27 @@ open class StackPanel(private val activateLast: Boolean = true,
         }
     }
 
-    override fun add(child: Widget): Container {
+    override fun add(child: Widget): StackPanel {
         super.add(child)
         if (activateLast) activeIndex = children.size - 1
         else if (activeIndex == -1) activeIndex = 0
         return this
     }
 
-    override fun addAll(children: List<Widget>): Container {
+    override fun addAll(children: List<Widget>): StackPanel {
         super.addAll(children)
         if (activateLast) activeIndex = this.children.size - 1
         else if (activeIndex == -1) activeIndex = 0
         return this
     }
 
-    override fun remove(child: Widget): Container {
+    override fun remove(child: Widget): StackPanel {
         super.remove(child)
         if (activeIndex > children.size - 1) activeIndex = children.size - 1
         return this
     }
 
-    override fun removeAll(): Container {
+    override fun removeAll(): StackPanel {
         super.removeAll()
         if (activeIndex > children.size - 1) activeIndex = children.size - 1
         return this
diff --git a/src/main/kotlin/pl/treksoft/kvision/panel/TabPanel.kt b/src/main/kotlin/pl/treksoft/kvision/panel/TabPanel.kt
index 817ecaa0..4190dbae 100644
--- a/src/main/kotlin/pl/treksoft/kvision/panel/TabPanel.kt
+++ b/src/main/kotlin/pl/treksoft/kvision/panel/TabPanel.kt
@@ -1,15 +1,12 @@
 package pl.treksoft.kvision.panel
 
-import pl.treksoft.kvision.core.Container
 import pl.treksoft.kvision.core.ResString
 import pl.treksoft.kvision.core.Widget
 import pl.treksoft.kvision.html.Link
 import pl.treksoft.kvision.html.TAG
 import pl.treksoft.kvision.html.Tag
 
-open class TabPanel : Container(setOf()) {
-    private var nav = Tag(TAG.UL, classes = setOf("nav", "nav-tabs"))
-    private var content = StackPanel(false)
+open class TabPanel : SimplePanel(setOf()) {
     var activeIndex
         get() = content.activeIndex
         set(value) {
@@ -20,9 +17,12 @@ open class TabPanel : Container(setOf()) {
             }
         }
 
+    private var nav = Tag(TAG.UL, classes = setOf("nav", "nav-tabs"))
+    private var content = StackPanel(false)
+
     init {
-        this.add(nav)
-        this.add(content)
+        this.addInternal(nav)
+        this.addInternal(content)
     }
 
     open fun addTab(title: String, panel: Widget, icon: String? = null,
@@ -52,4 +52,25 @@ open class TabPanel : Container(setOf()) {
         activeIndex = content.activeIndex
         return this
     }
+
+    override fun add(child: Widget): TabPanel {
+        return addTab("", child)
+    }
+
+    override fun addAll(children: List<Widget>): TabPanel {
+        children.forEach { add(it) }
+        return this
+    }
+
+    override fun remove(child: Widget): TabPanel {
+        val index = content.children.indexOf(child)
+        return removeTab(index)
+    }
+
+    override fun removeAll(): TabPanel {
+        content.removeAll()
+        nav.removeAll()
+        refresh()
+        return this
+    }
 }
diff --git a/src/test/kotlin/test/pl/treksoft/kvision/core/ContainerSpec.kt b/src/test/kotlin/test/pl/treksoft/kvision/core/ContainerSpec.kt
index c39aeb75..a169ace6 100644
--- a/src/test/kotlin/test/pl/treksoft/kvision/core/ContainerSpec.kt
+++ b/src/test/kotlin/test/pl/treksoft/kvision/core/ContainerSpec.kt
@@ -1,6 +1,6 @@
 package test.pl.treksoft.kvision.core
 
-import pl.treksoft.kvision.core.Container
+import pl.treksoft.kvision.panel.SimplePanel
 import pl.treksoft.kvision.core.Root
 import pl.treksoft.kvision.core.Widget
 import test.pl.treksoft.kvision.DomSpec
@@ -14,7 +14,7 @@ class ContainerSpec : DomSpec {
     fun add() {
         run {
             val root = Root("test")
-            val container = Container()
+            val container = SimplePanel()
             val child1 = Widget()
             child1.id = "child1"
             val child2 = Widget()
@@ -24,7 +24,7 @@ class ContainerSpec : DomSpec {
             root.add(container)
             val elem1 = document.getElementById("child1")
             val elem2 = document.getElementById("child2")
-            assertTrue("Container renders children") { elem1 != null && elem2 != null }
+            assertTrue("SimplePanel renders children") { elem1 != null && elem2 != null }
         }
     }
 
@@ -32,7 +32,7 @@ class ContainerSpec : DomSpec {
     fun addAll() {
         run {
             val root = Root("test")
-            val container = Container()
+            val container = SimplePanel()
             val child1 = Widget()
             child1.id = "child1"
             val child2 = Widget()
@@ -41,7 +41,7 @@ class ContainerSpec : DomSpec {
             root.add(container)
             val elem1 = document.getElementById("child1")
             val elem2 = document.getElementById("child2")
-            assertTrue("Container renders children") { elem1 != null && elem2 != null }
+            assertTrue("SimplePanel renders children") { elem1 != null && elem2 != null }
         }
     }
 
@@ -49,7 +49,7 @@ class ContainerSpec : DomSpec {
     fun remove() {
         run {
             val root = Root("test")
-            val container = Container()
+            val container = SimplePanel()
             val child1 = Widget()
             child1.id = "child1"
             val child2 = Widget()
@@ -60,7 +60,7 @@ class ContainerSpec : DomSpec {
             container.remove(child2)
             val elem1 = document.getElementById("child1")
             val elem2 = document.getElementById("child2")
-            assertTrue("Container renders children") { elem1 != null && elem2 == null }
+            assertTrue("SimplePanel renders children") { elem1 != null && elem2 == null }
         }
     }
 
@@ -68,7 +68,7 @@ class ContainerSpec : DomSpec {
     fun removeAll() {
         run {
             val root = Root("test")
-            val container = Container()
+            val container = SimplePanel()
             val child1 = Widget()
             child1.id = "child1"
             val child2 = Widget()
@@ -86,7 +86,7 @@ class ContainerSpec : DomSpec {
     fun getChildren() {
         run {
             val root = Root("test")
-            val container = Container()
+            val container = SimplePanel()
             val child1 = Widget()
             child1.id = "child1"
             val child2 = Widget()
diff --git a/src/test/kotlin/test/pl/treksoft/kvision/core/KVManagerSpec.kt b/src/test/kotlin/test/pl/treksoft/kvision/core/KVManagerSpec.kt
index f47e1900..307ebd67 100644
--- a/src/test/kotlin/test/pl/treksoft/kvision/core/KVManagerSpec.kt
+++ b/src/test/kotlin/test/pl/treksoft/kvision/core/KVManagerSpec.kt
@@ -20,8 +20,8 @@ class KVManagerSpec : DomSpec {
                 style = snStyle(listOf("fontWeight" to "bold", "fontStyle" to "italic"))
             })
             KVManager.patch("test", vnode)
-            assertTrue("Original container should not exist") { document.getElementById("test") == null }
-            assertTrue("New container should exist") { document.getElementById("test_new") != null }
+            assertTrue("Original child should not exist") { document.getElementById("test") == null }
+            assertTrue("New child should exist") { document.getElementById("test_new") != null }
         }
     }
 
@@ -38,9 +38,9 @@ class KVManagerSpec : DomSpec {
                 style = snStyle(listOf("fontWeight" to "bold", "fontStyle" to "italic"))
             })
             KVManager.patch(vnode2, vnode3)
-            assertTrue("First container should not exist") { document.getElementById("test") == null }
-            assertTrue("Second container should not exist") { document.getElementById("test2") == null }
-            assertTrue("Third container should exist") { document.getElementById("test3") != null }
+            assertTrue("First child should not exist") { document.getElementById("test") == null }
+            assertTrue("Second child should not exist") { document.getElementById("test2") == null }
+            assertTrue("Third child should exist") { document.getElementById("test3") != null }
         }
     }
 
@@ -49,10 +49,10 @@ class KVManagerSpec : DomSpec {
         run {
             val node = KVManager.virtualize("<div id=\"virtual\"><p>Virtual node</p></div>")
             KVManager.patch("test", node)
-            assertTrue("Original container should not exist") { document.getElementById("test") == null }
+            assertTrue("Original child should not exist") { document.getElementById("test") == null }
             val v = document.getElementById("virtual")
-            assertTrue("New container should exist") { v != null }
-            assertTrue("New container should have one child") { v?.children?.length == 1 }
+            assertTrue("New child should exist") { v != null }
+            assertTrue("New child should have one child") { v?.children?.length == 1 }
         }
     }
 }
diff --git a/src/test/kotlin/test/pl/treksoft/kvision/core/RootSpec.kt b/src/test/kotlin/test/pl/treksoft/kvision/core/RootSpec.kt
index 6407dbc3..9895c16d 100644
--- a/src/test/kotlin/test/pl/treksoft/kvision/core/RootSpec.kt
+++ b/src/test/kotlin/test/pl/treksoft/kvision/core/RootSpec.kt
@@ -14,7 +14,7 @@ class RootSpec : DomSpec {
         run {
             Root("test")
             val rootElem = document.getElementById("test")
-            assertTrue("Standard root container has correct css class") { rootElem?.className == "container-fluid" }
+            assertTrue("Standard root child has correct css class") { rootElem?.className == "container-fluid" }
         }
     }
 
@@ -23,7 +23,7 @@ class RootSpec : DomSpec {
         run {
             Root("test", fixed = true)
             val rootElem = document.getElementById("test")
-            assertTrue("Fluid root container has correct css class") { rootElem?.className == "container" }
+            assertTrue("Fluid root child has correct css class") { rootElem?.className == "container" }
         }
     }
 
-- 
cgit