Module: Tk::Clipboard

Included in:
Widget
Defined in:
lib/ffi-tk/command/clipboard.rb

Overview

Manipulate Tk clipboard

This command provides an interface to the Tk clipboard, which stores data for later retrieval. In order to copy data into the clipboard, [Clipboard.clear] must be called, followed by a sequence of one or more calls to [Clipboard.append]. To ensure that the clipboard is updated atomically, all appends should be completed before returning to the event loop.

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.append(options = {}) ⇒ Object

Appends data to the clipboard on window’s display in the form given by type with the representation given by format and claims ownership of the clipboard on window’s display.

type specifies the form in which the selection is to be returned (the desired “target” for conversion, in ICCCM terminology), and should be an atom name such as STRING or FILE_NAME; see the Inter-Client Communication Conventions Manual for complete details. type defaults to STRING.

The format argument specifies the representation that should be used to transmit the selection to the requester (the second column of Table 2 of the ICCCM), and defaults to STRING.

If format is STRING, the selection is transmitted as 8-bit ASCII characters. If format is ATOM, then the data is divided into fields separated by white space; each field is converted to its atom value, and the 32-bit atom value is transmitted instead of the atom name. For any other format, data is divided into fields separated by white space and each field is converted to a 32-bit integer; an array of integers is transmitted to the selection requester. Note that strings passed to clipboard append are concatenated before conversion, so the caller must take care to ensure appropriate spacing across string boundaries. All items appended to the clipboard with the same type must have the same format. The format is needed only for compatibility with clipboard requesters that do not use Tk. If the Tk toolkit is being used to retrieve the CLIPBOARD selection then the value is converted back to a string at the requesting end, so format is irrelevant.



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# File 'lib/ffi-tk/command/clipboard.rb', line 72

def append(options = {})
  args = []

  displayof, format, type, data =
    options.values_at(:displayof, :format, :type, :data)

  format = format.to_s.upcase if format

  args << '-displayof' << displayof if displayof
  args << '-format' << format.to_s.upcase if format
  args << '-type' << type.to_s.upcase if type
  args << '--' << data.to_s

  Tk.execute_only(:clipboard, :append, *args)
end

.clear(window = None) ⇒ Object

Claims ownership of the clipboard on window’s display and removes any previous contents. Window defaults to “.”.



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# File 'lib/ffi-tk/command/clipboard.rb', line 33

def clear(window = None)
  if None == window
    Tk.execute_only(:clipboard, :clear)
  else
    Tk.execute_only(:clipboard, :clear, '-displayof', window)
  end
end

.get(window = None, type = None) ⇒ Object

Retrieve data from the clipboard on window‘s display. window defaults to “.”. type specifies the form in which the data is to be returned and should be an atom name such as STRING or FILE_NAME. type defaults to STRING. This is equivalent to `Selection.get(selection: :clipboard)`.



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# File 'lib/ffi-tk/command/clipboard.rb', line 100

def get(window = None, type = None)
  options = {}
  options[:displayof] = window unless None == window
  options[:type] = type.to_s.upcase unless None == type

  content = Tk.execute(:clipboard, :get, options.to_tcl_options).to_s
  content.force_encoding('UTF-8')
  content
end

.set(string, options = {}) ⇒ Object

Shortcut to clear clipboard and append given string.



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# File 'lib/ffi-tk/command/clipboard.rb', line 89

def set(string, options = {})
  clear
  append(options.merge(data: string))
end

Instance Method Details

#clipboard_append(options = {}) ⇒ Object 



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# File 'lib/ffi-tk/command/clipboard.rb', line 16

def clipboard_append(options = {})
  Clipboard.append({ displayof: self }.merge(options))
end

#clipboard_clear ⇒ Object 



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# File 'lib/ffi-tk/command/clipboard.rb', line 12

def clipboard_clear
  Clipboard.clear(self)
end

#clipboard_get(type = None) ⇒ Object 



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# File 'lib/ffi-tk/command/clipboard.rb', line 20

def clipboard_get(type = None)
  Clipboard.get(self, type)
end

#clipboard_set(string, options = {}) ⇒ Object 



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# File 'lib/ffi-tk/command/clipboard.rb', line 24

def clipboard_set(string, options = {})
  Clipboard.set(string, options)
end