contrib/tinks/src/client/controls.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #     http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14
  15 # On-screen alternative controls
  16 module controls
  17
  18 import client
  19
  20 redef class App
  21
  22         # All active UI controls
  23         fun controls: Array[Control] is abstract
  24
  25         redef fun frame_core(display)
  26         do
  27                 super
  28
  29                 for control in controls do control.draw(display)
  30         end
  31
  32         redef fun input(event)
  33         do
  34                 for control in controls do
  35                         var hit = control.input(event)
  36                         if hit then return true
  37                 end
  38
  39                 return super
  40         end
  41 end
  42
  43 # An event raised by a `Control`
  44 class ControlEvent
  45         super InputEvent
  46
  47         # Sender control
  48         var sender: Control
  49 end
  50
  51 # UI control
  52 abstract class Control
  53
  54         # Draw `self` to `display`
  55         fun draw(display: Display) do end
  56
  57         # Intercept and act upon events concerving `self`
  58         fun input(event: InputEvent): Bool do return false
  59 end