Added documentation for new events.

Author: GPrimola

lib/scenic/component/button.ex

@@ -22,7 +22,16 @@ defmodule Scenic.Component.Button do
   If a button press is successful, it sends an event message to the host scene
   in the form of:
 
-      {:click, id}
+      `{:click, id}`
+
+  This event is only sent after the button is released. There're also, though,
+  two other events that you can receive:
+
+      `{:btn_pressed, id}`
+
+  and
+
+      `{:btn_released, id}`
 
   These messages can be received and handled in your scene via
   `c:Scenic.Scene.handle_event/3`. For example:

lib/scenic/component/input/dropdown.ex

@@ -31,6 +31,12 @@ defmodule Scenic.Component.Input.Dropdown do
 
   `{:value_changed, id, selected_item_id}`
 
+  It also send the following events:
+
+  `{:dropdown_opened, id}` - sent when the dropdown opens
+  `{:dropdown_closed, id}` - sent when the dropdown closes
+  `{:dropdown_item_hover, id, item_id}` - sent when and item is hovered
+
   ## Options
 
   Dropdowns honor the following list of options.
@@ -431,6 +437,7 @@ defmodule Scenic.Component.Input.Dropdown do
         %Scene{
           assigns: %{
             down: true,
+            id: component_id,
             items: items,
             graph: graph,
             selected_id: selected_id,
@@ -441,7 +448,7 @@ defmodule Scenic.Component.Input.Dropdown do
     # set the appropriate hilighting for each of the items
     graph = update_highlighting(graph, items, selected_id, id, theme)
 
-    :ok = send_parent_event(scene, {:dropdown_item_hover, id})
+    :ok = send_parent_event(scene, {:dropdown_item_hover, component_id, id})
 
     scene =
       scene

lib/scenic/component/input/text_field.ex

@@ -20,6 +20,11 @@ defmodule Scenic.Component.Input.TextField do
 
   `{:value_changed, id, value}`
 
+  It also sends other two events when focus is gained or lost, respectively:
+
+  `{:focus_in, id}`
+  `{:focus_out, id}`
+
   ## Styles
 
   Text fields honor the following styles

test/scenic/component/input/dropdown_test.exs

@@ -170,11 +170,11 @@ defmodule Scenic.Component.Input.DropdownTest do
 
     Input.send(vp, @hover_a)
     force_sync(vp.pid, comp_pid)
-    assert_receive({:fwd_event, {:dropdown_item_hover, 1}}, 100)
+    assert_receive({:fwd_event, {:dropdown_item_hover, :dropdown, 1}}, 100)
 
     Input.send(vp, @hover_b)
     force_sync(vp.pid, comp_pid)
-    assert_receive({:fwd_event, {:dropdown_item_hover, 2}}, 100)
+    assert_receive({:fwd_event, {:dropdown_item_hover, :dropdown, 2}}, 100)
 
     refute_receive(_, 10)
   end