eiffel-iup/examples/tutorial/simple_notepad_4.e

class SIMPLE_NOTEPAD_4

insert
	IUP_INTERFACE

create {ANY}
   make

feature {ANY}

	ml: IUP_MULTILINE

	str_find (str, str_to_find, casesensitive: STRING; pos: INTEGER): INTEGER
		do
			if str.count.is_equal(0) or str_to_find.count.is_equal(0) then
				Result := -1
			elseif casesensitive.is_equal("OFF") then
				str.to_lower
				str_to_find.to_lower
			end

			Result := str.substring_index(str_to_find, pos)
		end

	read_file (file_name: STRING): STRING
		local
			tfr: TEXT_FILE_READ
			str: STRING
			ms: IUP_MESSAGE
		do
			create str.make_empty
         create tfr.connect_to(file_name)

			if tfr.is_connected then
				from
					tfr.read_line
				until
					tfr.end_of_input
				loop
					str.append(tfr.last_string)
					str.append_character('%N')
					tfr.read_line
				end
				
				str.append(tfr.last_string)
				tfr.disconnect
			else
				str.append("Fail when reading from file: ")
				str.append(file_name)
				create ms.message("Error", str)
			end
			
			Result := str
		end

	write_file (file_name, text: STRING)
		local
			tfw: TEXT_FILE_WRITE
			ms: IUP_MESSAGE
			str: STRING
		do
			create tfw.connect_to(file_name)

			if tfw.is_connected then
				tfw.put_string(text)
				tfw.disconnect
			else
				str.make_empty
				str.append("Fail when writing to file: ")
				str.append(file_name)
				create ms.message("Error", str)
			end
		end

	--********************************** Callbacks *****************************************

	item_open_action_cb (widget: IUP_MENU_ITEM): STRING
		local
			status: INTEGER
			rv, name, text: STRING
			fd: IUP_FILE_DIALOG
		do
			create fd.file_dialog
			fd.set_dialog_type("OPEN")
			fd.set_ext_filter("Text files|*.txt|All Files|*.*|")
			fd.set_title("Select a text file")

			rv := fd.popup_predefined_xy("IUP_CENTER", "IUP_CENTER")

			if rv.is_equal("IUP_NOERROR") then
				status := fd.get_status

				if status.is_equal(0) then
					name := fd.get_value
					text := read_file(name)
					ml.set_value(text)
				end
			end

			fd.destroy
			Result := "IUP_DEFAULT"
		end

	item_saveas_action_cb (widget: IUP_MENU_ITEM): STRING
		local
			status: INTEGER
			rv, name, text: STRING
			fd: IUP_FILE_DIALOG
		do
			create fd.file_dialog
			fd.set_dialog_type("SAVE")
			fd.set_ext_filter("Text files|*.txt|All Files|*.*|")
			fd.set_title("Select a text file")

			rv := fd.popup_predefined_xy("IUP_CENTER", "IUP_CENTER")

			if rv.is_equal("IUP_NOERROR") then
				status := fd.get_status

				if not status.is_equal(-1) then
					name := fd.get_value
					text := ml.get_value
					write_file(name, text)
				end
			end

			fd.destroy
			Result := "IUP_DEFAULT"
		end

	item_font_action_cb (widget: IUP_MENU_ITEM): STRING
		local
			status: INTEGER
			rv, ft, selected: STRING
			fd: IUP_FONT_DIALOG
		do
			create fd.font_dialog
			ft := ml.get_font
			fd.set_value(ft)

			rv := fd.popup_predefined_xy("IUP_CENTER", "IUP_CENTER")

			if rv.is_equal("IUP_NOERROR") then
				status := fd.get_status

				if status.is_equal(1) then
					selected := fd.get_value
					ml.set_font(selected)
				end
			end

			fd.destroy
			Result := "IUP_DEFAULT"
		end

	item_about_action_cb (widget: IUP_MENU_ITEM): STRING
		local
			ms: IUP_MESSAGE
		do
			create ms.message("About","    Simple Notepad%N%NAutors:%N   Gustavo Lyrio%N   Antonio Scuri")
			Result := "IUP_DEFAULT"
		end

	item_exit_action_cb (widget: IUP_MENU_ITEM): STRING
		do
			Result := "IUP_CLOSE"
		end

	goto_ok_action_cb(widget: IUP_BUTTON): STRING
		local
			line_count, line: INTEGER
			txt: IUP_TEXT
			ms: IUP_MESSAGE
		do
			if txt ?:= widget.get_dialog_child("LINE_TEXT") then
				txt ::= widget.get_dialog_child("LINE_TEXT")

				line_count := widget.get_attribute_integer("TEXT_LINECOUNT")
				line := txt.get_value.to_integer

				if line < 1 and line >= line_count then
					create ms.message("Error", "Invalid line number.")
					Result := "IUP_DEFAULT"
				end

				widget.get_dialog.set_attribute_integer("STATUS", 1)
				Result := "IUP_CLOSE"
			end
		end

	goto_cancel_action_cb(widget: IUP_BUTTON): STRING
		do
			widget.get_dialog.set_attribute_integer("STATUS", 0)

			Result := "IUP_CLOSE"
		end

	item_goto_action_cb (widget: IUP_MENU_ITEM): STRING
		local
			dlg: IUP_DIALOG
			vbox: IUP_VBOX
			hbox: IUP_HBOX
			bt_ok, bt_cancel: IUP_BUTTON
			f: IUP_FILL
			lbl: IUP_LABEL
			txt: IUP_TEXT
			str, s: STRING
			line_count, line, pos: INTEGER
		do
			line_count := ml.get_line_count

			str := "Line Number [1-"
			str.append_string(ml.get_line_count.to_string)
			str.append_string("]:")

			create lbl.label(str)
			create txt.text
			txt.set_mask("IUP_MASK_UINT") -- unsigned integer numbers only
			txt.set_name("LINE_TEXT")
			txt.set_visible_columns(20)
			create bt_ok.button("OK")
			bt_ok.set_attribute_integer("TEXT_LINECOUNT", line_count)
			bt_ok.set_padding(10, 2)
			bt_ok.set_cb_action(agent goto_ok_action_cb(?))
			create bt_cancel.button("Cancel")
			bt_cancel.set_padding(10, 2)
			bt_cancel.set_cb_action(agent goto_cancel_action_cb(?))
			create f.fill

			create hbox.hbox({ARRAY[IUP_WIDGET] 1, << f, bt_ok, bt_cancel >>})
			hbox.set_normalize_size("HORIZONTAL")
			create vbox.vbox({ARRAY[IUP_WIDGET] 1, << lbl, txt, hbox >>})
			vbox.set_margin(10, 10)
			vbox.set_gap(5)

			create dlg.dialog(vbox)
			dlg.set_title("Go To Line")
			dlg.set_modal_dialog_frame(True)
			dlg.set_default_enter_widget(bt_ok)
			dlg.set_default_escape_widget(bt_cancel)
			dlg.set_parent_dialog_widget(widget.get_dialog)

			s := dlg.popup_predefined_xy ("IUP_CENTERPARENT", "IUP_CENTERPARENT")

			if s.is_equal("IUP_NOERROR") and dlg.get_attribute_integer("STATUS").is_equal(1) then
				line := txt.get_value.to_integer
				pos := ml.text_convert_lin_col_to_pos(line, 0)
				ml.set_multiline_caret_pos(pos)
				ml.scroll_to_pos(pos)
			end

			dlg.destroy
			
			Result := "IUP_DEFAULT"
		end

	find_next_action_cb (widget: IUP_BUTTON): STRING
		local
			str, str_to_find, casesensitive: STRING
			find_pos, pos, end_pos: INTEGER
			txt: IUP_TEXT
			find_case: IUP_TOGGLE
			tup: TUPLE[INTEGER, INTEGER]
			pw: IUP_WIDGET
			ms: IUP_MESSAGE
		do
			str := ml.get_value
			find_pos := ml.get_attribute_integer("FIND_POS")

			if find_pos = 0 then
				find_pos := 1
			end

			if txt ?:= widget.get_dialog_child("FIND_TEXT") then
				txt ::= widget.get_dialog_child("FIND_TEXT")

				str_to_find := txt.get_value

				if find_case ?:= widget.get_dialog_child("FIND_CASE") then
					find_case ::= widget.get_dialog_child("FIND_CASE")

					casesensitive := find_case.get_value

					-- Rest 1 since the string start at 1, but multiline position
					-- start at 0.
					pos := str_find(str, str_to_find, casesensitive, find_pos) - 1

					if pos < 0 and find_pos > 0 then
						-- try again from the start
						pos := str_find(str, str_to_find, casesensitive, 1) - 1
					end

					if pos > 0 then
						end_pos := pos + str_to_find.count
						ml.set_attribute_integer("FIND_POS", end_pos)
						pw := ml.set_focus
						ml.set_multiline_selection_pos(pos, end_pos)

						tup := ml.text_convert_pos_to_lin_col(pos)
						-- position at col=0, just scroll lines
						pos := ml.text_convert_lin_col_to_pos(tup.item_1, 0)
						ml.scroll_to_pos(pos)
					else
						create ms.message("Warning", "Text not found.")
					end
				end
				
			end
			
			Result := "IUP_DEFAULT"
		end

	find_close_action_cb (widget: IUP_BUTTON): STRING
		do
			widget.get_dialog.hide

			Result := "IUP_DEFAULT"
		end

	item_find_action_cb (widget: IUP_MENU_ITEM): STRING
		local
			dlg: IUP_DIALOG
			lbl: IUP_LABEL
			txt: IUP_TEXT
			bt_next, bt_close: IUP_BUTTON
			find_case: IUP_TOGGLE
			f: IUP_FILL
			hbox: IUP_HBOX
			vbox: IUP_VBOX
			s: STRING
		do
			if dlg ?:= widget.get_attribute_widget("FIND_DIALOG") then
				dlg ::= widget.get_attribute_widget("FIND_DIALOG")
			end

			if dlg = Void then
				create lbl.label("Find What:")
				create txt.text
				txt.set_name("FIND_TEXT")
				txt.set_visible_columns(20)
				create find_case.toggle("Case Sensitive")
				find_case.set_name("FIND_CASE")
				create bt_next.button("Find Next")
				bt_next.set_padding(10, 2)
				bt_next.set_cb_action(agent find_next_action_cb(?))
				create bt_close.button("Close")
				bt_close.set_padding(10, 2)
				bt_close.set_cb_action(agent find_close_action_cb(?))
				create f.fill

				create hbox.hbox({ARRAY[IUP_WIDGET] 1, << f, bt_next, bt_close >>})
				hbox.set_normalize_size("HORIZONTAL")
				create vbox.vbox({ARRAY[IUP_WIDGET] 1, << lbl, txt, find_case, hbox >>})
				vbox.set_margin(10, 10)
				vbox.set_gap(10)

				create dlg.dialog(vbox)
				dlg.set_title("Find")
				dlg.set_modal_dialog_frame(True)
				dlg.set_default_enter_widget(bt_next)
				dlg.set_default_escape_widget(bt_close)
				dlg.set_parent_dialog_widget(widget.get_dialog)

				-- Save the dialog to reuse it
				widget.set_attribute_widget("FIND_DIALOG", dlg)
			end
			
			-- centerparent first time, next time reuse the last position
			s := dlg.show_predefined_xy("IUP_CURRENT", "IUP_CURRENT")

			Result := "IUP_DEFAULT"
		end

	--********************************** Make *****************************************

	make
      local
			i: STRING
			gui: IUP
			v: IUP_VBOX
			w: IUP_DIALOG
			item_exit, item_open, item_saveas, item_font, item_about: IUP_MENU_ITEM
			item_find, item_goto: IUP_MENU_ITEM
			sep: IUP_MENU_SEPARATOR
			file_menu, edit_menu, format_menu, help_menu, menu: IUP_MENU
			sub_menu_file, sub_menu_edit, sub_menu_format, sub_menu_help: IUP_SUBMENU
		do
			gui := iup_open
			
			create ml.multiline
			ml.set_expand("YES")
			
	      create v.vbox({ARRAY[IUP_WIDGET] 1, << ml >>})

			create item_open.item("Open...")
			item_open.set_hide_mark(True)
			item_open.set_cb_action(agent item_open_action_cb(?))

			create item_saveas.item("Save As...")
			item_saveas.set_hide_mark(True)
			item_saveas.set_cb_action(agent item_saveas_action_cb(?))

			create item_exit.item("Exit")
			item_exit.set_hide_mark(True)
			item_exit.set_cb_action(agent item_exit_action_cb(?))

			create item_find.item("Find...")
			item_find.set_hide_mark(True)
			item_find.set_cb_action(agent item_find_action_cb(?))

			create item_goto.item("Go To...")
			item_goto.set_hide_mark(True)
			item_goto.set_cb_action(agent item_goto_action_cb(?))

			create item_font.item("Font...")
			item_font.set_hide_mark(True)
			item_font.set_cb_action(agent item_font_action_cb(?))

			create item_about.item("About...")
			item_about.set_hide_mark(True)
			item_about.set_cb_action(agent item_about_action_cb(?))

			create sep.separator

			create file_menu.menu({ARRAY[IUP_MENU_ELEMENT] 1, << item_open, item_saveas, sep, item_exit >>})
			create edit_menu.menu({ARRAY[IUP_MENU_ELEMENT] 1, << item_find, item_goto >>})
			create format_menu.menu({ARRAY[IUP_MENU_ELEMENT] 1, << item_font >>})
			create help_menu.menu({ARRAY[IUP_MENU_ELEMENT] 1, << item_about >>})

			create sub_menu_file.submenu("File", file_menu)
			create sub_menu_edit.submenu("Edit", edit_menu)
			create sub_menu_format.submenu("Format", format_menu)
			create sub_menu_help.submenu("Help", help_menu)
			
			create menu.menu({ARRAY[IUP_MENU_ELEMENT] 1, << sub_menu_file, sub_menu_edit, sub_menu_format, sub_menu_help >>})
			
	      create w.dialog(v)
			w.set_menu_widget(menu)
			w.set_title("Simple Notepad")
			w.set_predefined_size("HALF", "HALF")

			-- parent for pre-defined dialogs in callbak functions
			gui.set_global_parent_dialog_widget(w)
			
	      i := w.show_predefined_xy("IUP_CENTER", "IUP_CENTER")
			w.set_user_size(0, 0)
			
         gui.main_loop
			gui.close
		end

end