lib/glimmer/libui/control_proxy/text_proxy.rb
# Copyright (c) 2021-2024 Andy Maleh
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
require 'glimmer/libui/control_proxy'
require 'glimmer/libui/control_proxy/area_proxy'
require 'glimmer/libui/parent'
require 'glimmer/libui/control_proxy/transformable'
module Glimmer
module LibUI
class ControlProxy
# Proxy for LibUI text objects
#
# Follows the Proxy Design Pattern
class TextProxy < ControlProxy
include Parent
include PerfectShaped
prepend Transformable
def initialize(keyword, parent, args, &block)
@keyword = keyword
@parent_proxy = parent
@args = args
@block = block
post_add_content if @block.nil?
end
def post_add_content
super
if @parent_proxy.nil? && AreaProxy.current_area_draw_params
draw(AreaProxy.current_area_draw_params)
destroy
end
end
def draw(area_draw_params)
reset_attributed_string
children.dup.each {|child| child.draw(area_draw_params)}
build_control
::LibUI.draw_text(area_draw_params[:context], @libui, x, y)
::LibUI.draw_free_text_layout(@libui)
::LibUI.free_attributed_string(@attributed_string)
end
def destroy
return if ControlProxy.main_window_proxy&.destroying?
deregister_all_custom_listeners
@parent_proxy&.children&.delete(self)
ControlProxy.control_proxies.delete(self)
end
def redraw
@parent_proxy&.queue_redraw_all
end
def x(value = nil)
if value.nil?
@x ||= args[0] || 0
else
@x = value
end
end
alias x= x
alias set_x x
def y(value = nil)
if value.nil?
@y ||= args[1] || 0
else
@y = value
end
end
alias y= y
alias set_y y
def width(value = nil)
if value.nil?
@width ||= args[2] || (AreaProxy.current_area_draw_params && (AreaProxy.current_area_draw_params[:area_width] - 2*x))
else
@width = value
redraw
end
end
alias width= width
alias set_width width
def attributed_string
@attributed_string ||= reset_attributed_string
end
def reset_attributed_string
@attributed_string = ::LibUI.new_attributed_string('')
end
def default_font(value = nil)
if value.nil?
@default_font ||= {
family: 'Helvetica',
size: 12.0,
weight: :normal,
italic: :normal,
stretch: :normal,
}
else
@default_font = value
redraw
end
end
alias default_font= default_font
alias set_default_font default_font
def default_font_descriptor
@default_font_descriptor ||= ::LibUI::FFI::FontDescriptor.malloc
@default_font_descriptor.Family = default_font[:family] || 'Helvetica'
@default_font_descriptor.Size = default_font[:size] || 12.0
@default_font_descriptor.Weight = Glimmer::LibUI.enum_symbol_to_value(:text_weight, default_font[:weight], default_symbol: :normal)
@default_font_descriptor.Italic = Glimmer::LibUI.enum_symbol_to_value(:text_italic, default_font[:italic], default_symbol: :normal)
@default_font_descriptor.Stretch = Glimmer::LibUI.enum_symbol_to_value(:text_stretch, default_font[:stretch], default_symbol: :normal)
@default_font_descriptor
end
def align(value = nil)
if value.nil?
@align
else
@align = value
redraw
end
end
alias align= align
alias set_align align
def draw_text_layout_params
@draw_text_layout_params ||= ::LibUI::FFI::DrawTextLayoutParams.malloc
@draw_text_layout_params.String = attributed_string
@draw_text_layout_params.DefaultFont = default_font_descriptor
@draw_text_layout_params.Width = width
@draw_text_layout_params.Align = Glimmer::LibUI.enum_symbol_to_value(:draw_text_align, align, default_symbol: :left)
@draw_text_layout_params
end
def area_proxy
# TODO eventually reuse this method from Shape
find_parent_in_ancestors { |parent| parent.nil? || parent.is_a?(ControlProxy::AreaProxy) }
end
def find_parent_in_ancestors(&condition)
# TODO eventually reuse this method from Shape
found = self
until condition.call(found)
# TODO in the future, support nesting under composite shape where there is parent instead of parent_proxy
# found = found.respond_to?(:parent_proxy) ? found.parent_proxy : found.parent
found = found.parent_proxy
end
found
end
def can_handle_listener?(listener_name)
area_proxy&.can_handle_listener?(listener_name)
end
def handle_listener(listener_name, &listener)
area_proxy.handle_listener(listener_name) do |event|
listener.call(event) if include?(event[:x], event[:y])
end
end
def perfect_shape
require 'perfect-shape'
the_perfect_shape_dependencies = perfect_shape_dependencies
if the_perfect_shape_dependencies != @perfect_shape_dependencies
absolute_x, absolute_y, width, height = @perfect_shape_dependencies = the_perfect_shape_dependencies
@perfect_shape = PerfectShape::Rectangle.new(x: absolute_x, y: absolute_y, width: width, height: height)
end
@perfect_shape
end
def perfect_shape_dependencies
# TODO support absolute_x and absolute_y with relative positioning in the future
absolute_x = x
absolute_y = y
[absolute_x, absolute_y, extent_width, extent_height]
end
def extent_width
if @extent_width.to_f > 0
@extent_width
else # TODO auto calculate extents
width
end
end
def extent_height
if @extent_height.to_f > 0
@extent_height
else # TODO auto calculate extents
children_max_size = children.map(&:font).map {|font| font[:size] if font.respond_to?(:[]) }.compact.max
if children_max_size.to_f > 0
children_max_size
else
@default_font[:size]
end
end
end
def calculate_extents
# TODO fix implementation once libui binding project responds about this
# as it always returns 0,0 right now
extent_width = Fiddle::Pointer.malloc(Fiddle::SIZEOF_DOUBLE*8)
extent_height = Fiddle::Pointer.malloc(Fiddle::SIZEOF_DOUBLE*8)
::LibUI.draw_text_layout_extents(@libui, extent_width, extent_height)
@extent_width = extent_width[0, Fiddle::SIZEOF_DOUBLE*8].unpack1('i')
@extent_height = extent_height[0, Fiddle::SIZEOF_DOUBLE*8].unpack1('i')
end
private
def build_control
@libui = ::LibUI.draw_new_text_layout(draw_text_layout_params)
end
def init_draw_brush(draw_brush, draw_brush_args)
draw_brush.Type = Glimmer::LibUI.enum_symbol_to_value(:draw_brush_type, draw_brush_args[:type])
draw_brush.R = (draw_brush_args[:r] || draw_brush_args[:red]).to_f / 255.0
draw_brush.G = (draw_brush_args[:g] || draw_brush_args[:green]).to_f / 255.0
draw_brush.B = (draw_brush_args[:b] || draw_brush_args[:blue]).to_f / 255.0
draw_brush.A = (draw_brush_args[:a] || draw_brush_args[:alpha])
end
end
end
end
end