Class: Shoes::Swt::KeyListener

Inherits:
Object
  • Object
show all
Includes:
Common::SafelyEvaluate, Swt::KeyListener
Defined in:
shoes-swt/lib/shoes/swt/key_listener.rb

Direct Known Subclasses

Keypress, Keyrelease

Constant Summary collapse

SPECIAL_KEY_NAMES = 
Hash[
        %w[TAB PAGE_UP PAGE_DOWN HOME END F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12
 F13 F14 F15].map do |key|
[get_swt_constant(key), key.downcase]
MODIFIER_KEYS = 
%w[CTRL SHIFT ALT CAPS_LOCK COMMAND].map do |key|
  get_swt_constant key
end
BUTTON_EXCLUDES = 
["\n", " "].freeze
COMBO_EXCLUDES = 
%w[up down] + BUTTON_EXCLUDES

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Common::SafelyEvaluate

#safely_evaluate

Constructor Details

#initialize(_dsl, app, &blk) ⇒ KeyListener

Returns a new instance of KeyListener.



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# File 'shoes-swt/lib/shoes/swt/key_listener.rb', line 35

def initialize(_dsl, app, &blk)
  @block = blk
  @app = app
  @app.add_key_listener(self)
end

Class Method Details

.get_swt_constant(name) ⇒ Object 



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# File 'shoes-swt/lib/shoes/swt/key_listener.rb', line 9

def self.get_swt_constant(name)
  ::Swt::SWT.const_get name
end

Instance Method Details

#handle_key_event(event) ⇒ Object 



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# File 'shoes-swt/lib/shoes/swt/key_listener.rb', line 41

def handle_key_event(event)
  modifiers = modifier_keys(event)
  character = character_key(event)
  key_string = modifiers + character
  key_string = key_string.to_sym if should_be_symbol?(event, modifiers)
  eval_block key_string unless character.empty?
end

#ignore_event?(event) ⇒ Boolean

For a variety of SWT controls, certain characters should not be passed to Shoes key listeners, since they’re already handled by the controls.

* Buttons ignore activating key press (enter, space depending on OS)
* Text boxes ignore all key presses
* Combo boxes ignore up/down and activating key presses

Returns:

  • (Boolean) 


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# File 'shoes-swt/lib/shoes/swt/key_listener.rb', line 62

def ignore_event?(event)
  char = character_key(event)
  case event.widget
  when Java::OrgEclipseSwtWidgets::Button
    BUTTON_EXCLUDES.include?(char)
  when Java::OrgEclipseSwtWidgets::Text
    true
  when Java::OrgEclipseSwtWidgets::Combo
    COMBO_EXCLUDES.include?(char)
  else
    # Default? Don't ignore it!
    false
  end
end

#remove ⇒ Object 



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# File 'shoes-swt/lib/shoes/swt/key_listener.rb', line 49

def remove
  @app.remove_key_listener(self)
end