Class: Glimmer::SWT::LayoutDataProxy

Inherits:
Object
  • Object
show all
Defined in:
lib/glimmer/swt/layout_data_proxy.rb

Overview

Generic proxy for all SWT layout data objects, such as GridData & RowData

This class is meant to be used with an existing WidgetProxy as it figures out the right SWT layout data class name by convention from the parent SWT widget layout class name

The convention is:

  • Start with the parent widget layout package/class name (e.g. org.eclipse.swt.layout.RowLayout)

  • Replace the word “Layout” with “Data” in the class name

Examples of figuring out SWT layout data class:

  • org.eclipse.swt.layout.RowData for org.eclipse.swt.layout.RowLayout

  • org.eclipse.swt.layout.GridData for org.eclipse.swt.layout.GridLayout

Follows the Proxy Design Pattern

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(widget_proxy, args) ⇒ LayoutDataProxy

Inititalizes with owning widget proxy and layout data arguments



28
29
30
31
32
33
34
35
36
37
38
 
# File 'lib/glimmer/swt/layout_data_proxy.rb', line 28

def initialize(widget_proxy, args)
  @widget_proxy = widget_proxy
  args = SWTProxy.constantify_args(args)
  begin
    @swt_layout_data = swt_layout_data_class.new(*args)
  rescue => e
    Glimmer::Config.logger.debug {"#{e.message}\n#{e.backtrace.join("\n")}"}
    @swt_layout_data = args.first if args.count == 1
  end
  @widget_proxy.swt_widget.setLayoutData(@swt_layout_data)
end

Instance Attribute Details

#swt_layout_data ⇒ Object (readonly)

Returns the value of attribute swt_layout_data.



25
26
27
 
# File 'lib/glimmer/swt/layout_data_proxy.rb', line 25

def swt_layout_data
  @swt_layout_data
end

#widget_proxy ⇒ Object (readonly)

Returns the value of attribute widget_proxy.



24
25
26
 
# File 'lib/glimmer/swt/layout_data_proxy.rb', line 24

def widget_proxy
  @widget_proxy
end

Instance Method Details

#attribute_getter(attribute_name) ⇒ Object 



79
80
81
 
# File 'lib/glimmer/swt/layout_data_proxy.rb', line 79

def attribute_getter(attribute_name)
  "#{attribute_name.to_s.camelcase(:lower)}"
end

#attribute_setter(attribute_name) ⇒ Object 



75
76
77
 
# File 'lib/glimmer/swt/layout_data_proxy.rb', line 75

def attribute_setter(attribute_name)
  "#{attribute_name.to_s.camelcase(:lower)}="
end

#get_attribute(attribute_name) ⇒ Object 



71
72
73
 
# File 'lib/glimmer/swt/layout_data_proxy.rb', line 71

def get_attribute(attribute_name)
  @swt_layout_data.send(attribute_getter(attribute_name))
end

#has_attribute?(attribute_name, *args) ⇒ Boolean

Returns:

  • (Boolean) 


59
60
61
 
# File 'lib/glimmer/swt/layout_data_proxy.rb', line 59

def has_attribute?(attribute_name, *args)
  @swt_layout_data.respond_to?(attribute_setter(attribute_name), args)
end

#set_attribute(attribute_name, *args) ⇒ Object 



63
64
65
66
67
68
69
 
# File 'lib/glimmer/swt/layout_data_proxy.rb', line 63

def set_attribute(attribute_name, *args)
  args = SWTProxy.constantify_args(args)
  if args.first != @swt_layout_data.send(attribute_getter(attribute_name))
    @swt_layout_data.send(attribute_setter(attribute_name), *args)
    @widget_proxy.swt_widget.getShell.pack
  end
end

#swt_layout_data_class ⇒ Object

This figures out the right SWT layout data class name by convention from the parent SWT widget layout class name

Supports layout data classes in and out of basic SWT library

The convention is:

  • Start with the parent widget layout package/class name (e.g. org.eclipse.swt.layout.RowLayout)

  • Replace the word “Layout” with “Data” in the class name

Examples of figuring out SWT layout data class:

  • org.eclipse.swt.layout.RowData for org.eclipse.swt.layout.RowLayout

  • org.eclipse.swt.layout.GridData for org.eclipse.swt.layout.GridLayout



53
54
55
56
57
 
# File 'lib/glimmer/swt/layout_data_proxy.rb', line 53

def swt_layout_data_class
  parent_layout_class_name = @widget_proxy.swt_widget.getParent.getLayout.class.name
  layout_data_class_name = parent_layout_class_name.sub(/Layout$/, 'Data')
  eval(layout_data_class_name)
end