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draw_text.rb
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draw_text.rb
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require 'libui'
UI = LibUI
def append_with_attribute(attr_str, what, attr1, attr2)
start_pos = UI.attributed_string_len(attr_str)
end_pos = start_pos + what.length
UI.attributed_string_append_unattributed(attr_str, what)
UI.attributed_string_set_attribute(attr_str, attr1, start_pos, end_pos)
UI.attributed_string_set_attribute(attr_str, attr2, start_pos, end_pos) if attr2
end
def make_attribute_string
attr_str = UI.new_attributed_string(
"Drawing strings with libui is done with the uiAttributedString and uiDrawTextLayout objects.\n" \
'uiAttributedString lets you have a variety of attributes: '
)
attr1 = UI.new_family_attribute('Courier New')
append_with_attribute(attr_str, 'font family', attr1, nil)
UI.attributed_string_append_unattributed(attr_str, ', ')
attr1 = UI.new_size_attribute(18)
append_with_attribute(attr_str, 'font size', attr1, nil)
UI.attributed_string_append_unattributed(attr_str, ', ')
attr1 = UI.new_weight_attribute(UI::TextWeightBold)
append_with_attribute(attr_str, 'font weight', attr1, nil)
UI.attributed_string_append_unattributed(attr_str, ', ')
attr1 = UI.new_italic_attribute(UI::TextItalicItalic)
append_with_attribute(attr_str, 'font italicness', attr1, nil)
UI.attributed_string_append_unattributed(attr_str, ', ')
attr1 = UI.new_stretch_attribute(UI::TextStretchCondensed)
append_with_attribute(attr_str, 'font stretch', attr1, nil)
UI.attributed_string_append_unattributed(attr_str, ', ')
attr1 = UI.new_color_attribute(0.75, 0.25, 0.5, 0.75)
append_with_attribute(attr_str, 'text color', attr1, nil)
UI.attributed_string_append_unattributed(attr_str, ', ')
attr1 = UI.new_background_attribute(0.5, 0.5, 0.25, 0.5)
append_with_attribute(attr_str, 'text background color', attr1, nil)
UI.attributed_string_append_unattributed(attr_str, ', ')
attr1 = UI.new_underline_attribute(UI::UnderlineSingle)
append_with_attribute(attr_str, 'underline style', attr1, nil)
UI.attributed_string_append_unattributed(attr_str, ', ')
UI.attributed_string_append_unattributed(attr_str, 'and ')
attr1 = UI.new_underline_attribute(UI::UnderlineDouble)
attr2 = UI.new_underline_color_attribute(UI::UnderlineColorCustom, 1.0, 0.0, 0.5, 1.0)
append_with_attribute(attr_str, 'underline color', attr1, attr2)
UI.attributed_string_append_unattributed(attr_str, '. ')
UI.attributed_string_append_unattributed(attr_str, 'Furthermore, there are attributes allowing for ')
attr1 = UI.new_underline_attribute(UI::UnderlineSuggestion)
attr2 = UI.new_underline_color_attribute(UI::UnderlineColorSpelling, 0, 0, 0, 0)
append_with_attribute(attr_str, 'special underlines for indicating spelling errors', attr1, attr2)
UI.attributed_string_append_unattributed(attr_str, ' (and other types of errors) ')
UI.attributed_string_append_unattributed(attr_str,
'and control over OpenType features such as ligatures (for instance, ')
otf = UI.new_open_type_features
UI.open_type_features_add(otf, 'l', 'i', 'g', 'a', 0)
attr1 = UI.new_features_attribute(otf)
append_with_attribute(attr_str, 'afford', attr1, nil)
UI.attributed_string_append_unattributed(attr_str, ' vs. ')
UI.open_type_features_add(otf, 'l', 'i', 'g', 'a', 1)
attr1 = UI.new_features_attribute(otf)
append_with_attribute(attr_str, 'afford', attr1, nil)
UI.free_open_type_features(otf)
UI.attributed_string_append_unattributed(attr_str, ").\n")
UI.attributed_string_append_unattributed(attr_str,
'Use the controls opposite to the text to control properties of the text.')
attr_str
end
def on_font_changed(area)
UI.area_queue_redraw_all(area)
end
def on_combobox_selected(area)
UI.area_queue_redraw_all(area)
end
def draw_event(adp, attr_str, font_button, alignment)
area_draw_params = UI::FFI::AreaDrawParams.new(adp)
default_font = UI::FFI::FontDescriptor.malloc
default_font.to_ptr.free = Fiddle::RUBY_FREE
params = UI::FFI::DrawTextLayoutParams.malloc
params.to_ptr.free = Fiddle::RUBY_FREE
params.String = attr_str
UI.font_button_font(font_button, default_font)
params.DefaultFont = default_font
params.Width = area_draw_params.AreaWidth
params.Align = UI.combobox_selected(alignment)
text_layout = UI.draw_new_text_layout(params)
UI.draw_text(area_draw_params.Context, text_layout, 0, 0)
UI.draw_free_text_layout(text_layout)
UI.free_font_button_font(default_font)
end
UI.init
handler = UI::FFI::AreaHandler.malloc
handler.to_ptr.free = Fiddle::RUBY_FREE
handler_draw_event = Fiddle::Closure::BlockCaller.new(0, [1, 1, 1]) do |_, _area, adp|
draw_event(adp, @attr_str, @font_button, @alignment)
end
handler.Draw = handler_draw_event
do_nothing = Fiddle::Closure::BlockCaller.new(0, [0]) {}
key_event = Fiddle::Closure::BlockCaller.new(1, [0]) { 0 }
handler.MouseEvent = do_nothing
handler.MouseCrossed = do_nothing
handler.DragBroken = do_nothing
handler.KeyEvent = key_event
@attr_str = make_attribute_string
main_window = UI.new_window('Text-Drawing Example', 640, 480, 1)
UI.window_set_margined(main_window, 1)
UI.window_on_closing(main_window) do
UI.quit
1
end
hbox = UI.new_horizontal_box
UI.box_set_padded(hbox, 1)
UI.window_set_child(main_window, hbox)
vbox = UI.new_vertical_box
UI.box_set_padded(vbox, 1)
UI.box_append(hbox, vbox, 0)
@font_button = UI.new_font_button
UI.font_button_on_changed(@font_button) { on_font_changed(@area) }
UI.box_append(vbox, @font_button, 0)
form = UI.new_form
UI.form_set_padded(form, 1)
UI.box_append(vbox, form, 0)
@alignment = UI.new_combobox
UI.combobox_append(@alignment, 'Left')
UI.combobox_append(@alignment, 'Center')
UI.combobox_append(@alignment, 'Right')
UI.combobox_set_selected(@alignment, 0)
UI.combobox_on_selected(@alignment) { on_combobox_selected(@area) }
UI.form_append(form, 'Alignment', @alignment, 0)
@area = UI.new_area(handler)
UI.box_append(hbox, @area, 1)
UI.control_show(main_window)
UI.main
UI.free_attributed_string(@attr_str)
UI.uninit