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Topic: murgaLua FLTK Menu System Problems, Problems with murga Lua fltk menu system

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mav_it

Group: Members
Posts: 7
Joined: Mar. 2007

Posted: Oct. 29 2007,17:38

Hi to all,

Sorry for the inconvenience, but I have a problem using callbacks in the murgaLua FLTK Menu bar. I have managed to create the menu bar with sub menus, but I'm not capable of inserting callbacks for menu items to do something useful.
The code is the following (I was trying to converto to murgaLua the FLTK editor example in the FLTK documentation) :

Code Sample

#!/bin/lua

ww = 800
wh = 600

window = fltk:Fl_Double_Window(ww,wh,"My first little app")

textbuf = fltk:Fl_Text_Buffer();

--- Debug only : show something in the editing area
textbuf:loadfile("editor.lua");
--editor = fltk:Fl_Text_Editor(10,30,ww-20,wh-30)
editor = fltk:Fl_Text_Editor(10,30,ww-20,wh-60)
editor:buffer(textbuf)

-- Callbacks for menu items
function open_cb(object)
end

function insert_cb(object)
end

function save_cb(object)
end

function saveas_cb(object)
end

function view_cb(object)
end

function close_cb(object)
end

function quit_cb(object)
if fltk.fl_choice("Are you sure ?","No",nil,"Yes") >= 1 then
window:hide()
end
end

btn = fltk:Fl_Button((ww / 2)-30,(wh-30),60,30,"QUIT")
btn:callback(quit_cb)

--- Build Up dynamically the menu:
--- Dont know how to pass a table statically
mb = fltk:Fl_Menu_Bar(0,0,800,30)
mb:add("&File/&New File", 0, new_cb)
mb:add("&File/&Insert File", 0, insert_cb)
mb:add("&File/&Save File", 0, save_cb)
mb:add("&File/Save File &As", 0, saveas_cb)
mb:add("&File/New &View", 0, view_cb)
mb:add("&File/&Close View", 0, close_cb)
mb:add("&File/E&xit", 0, quit_cb)

mb:add("&Edit",0, 0, 0, FL_SUBMENU)
mb:add("&Search",0, 0, 0, FL_SUBMENU)
mb:add("&Help",0, 0, 0, FL_SUBMENU)

window:show()
Fl:run()

The only callback that is not empty is the exit callback, that I have also used for the big QUIT button below: used in the QUIT button, the

Code Sample

quit_cb()

callback works very well, what I do wrong when I use it in the add menu function ?

Thank You in advance,

Mauro

roberts

Group: Members
Posts: 4983
Joined: Oct. 2003

Posted: Oct. 29 2007,18:53

Probably many ways...
But I would add a callback to mb

mb:callback(menuItem)

Then you can choose to use value or text to retrieve menu item selected. Value is a numerical index into the Fl_menu array or text is the actual value of the menu item.

Make a new function like this:

function menuItem(object)
print(object:value())
end

Run this from console and you will see the index value printing. Then you could use this in a case statement to determine what code or function to call.

Or use

print(object:text())

if you prefer to use the text values of the menu items.

mikshaw

Group: Members
Posts: 4856
Joined: July 2004

Posted: Oct. 29 2007,19:06

The menu features are not fully supported at this time, including individual callbacks for individual menu items.

The only thing I've found to work so far is to make a single callback for the whole menu. In that callback function you test the menu text and run the appropriate function as a result.

for example:

Code Sample

mb:callback(
function()
if mb:text()=="&New File" then open_cb()
elseif mb:text()=="&Insert File" then insert_cb()
end
end
)

EDIT:

Quote

choose to use value or text to retrieve menu item selected

I forgot about the nurmerical value.

--------------
http://www.tldp.org/LDP/intro-linux/html/index.html

mav_it

Group: Members
Posts: 7
Joined: Mar. 2007

Posted: Oct. 29 2007,20:36

Thank you very much to you both, I will try these methods now.

Mauro.

mav_it

Group: Members
Posts: 7
Joined: Mar. 2007

Posted: Nov. 05 2007,22:54

I have managed to reach what I think is a show-stopper..

I have addressed many missing (unimplmented ? ) functions, but currently I cannot impement serching within the text buffer, since using the Fl_text_buffer:search_forward(), or Fl_textBuffer:search backward(), murgaLua gives a "search_forward nil method" error.

Anyway, by using keyboard, the editor is working, except for find/replace functions.

The portion of the code that is not working is :

Code Sample

-- SEARCH MENU CALLBACKS
function find_cb()
local str
local fnd
str = fltk.fl_input("Insert a string to search", lastsearch)
if (str ~= 0) then
fnd = tb:search_forward(0,str,fnd,0)
if (fnd ~= 0) then
tb:select(fnd, tb:word_end(fnd))
else
fltk.fl_message("String " .. str .. "Not found!")
end
end
end

Here, the tb:search_forward(0,str,fnd,0) (tb is a Text_Buffer variable) does not work, and MurgaLua gives:

Code Sample

attempt to call method "search_forward" : a nil value

I suspect that this method has not been implemented in MurgaLua.

The complete editor, should anyone find it useful for anything, is the following (note that the replace dialog is not implemented, being not able to perform the search...

Code Sample

#!/bin/lua

version = "0.01"

ww = 1024
wh = 768

title = "MURGA LUA FLTK EDITOR - "

-- -- Main window
w = fltk:Fl_Double_Window(ww,wh,title)
-- -- Text Buffer to hold file to edit
tb = fltk:Fl_Text_Buffer();

changed = false
filename = ""
saved = true
newfile = false
lastsearch = ""

-- This will be used to hold copied / cutted text
clipboard = ""

-- Editor widget will work for standard keyboard shortcuts
ed = fltk:Fl_Text_Editor(10,30,ww-20,wh-60)
ed:buffer(tb)

function ask_save(object)
if (not saved) then
if fltk.fl_choice("There are unsevd Buffers. Do you want to save ?","No",nil,"Yes") >= 1 then
save_cb()
end
end
end

-- check if we need to save to close
function check_save(object)
if (not saved) then
if fltk.fl_choice("There are unsevd Buffers. Do you Really want to exit ?","No",nil,"Yes") >= 1 then
w:hide()
end
else
w:hide()
end
end

w:callback(check_save)

-- Callback for menu bar
function menuItem(object)
--print(mb:text() .. ' --> ' .. mb:value())
if (mb:text()=="&New File") then new_cb()

-- FILE MENU
elseif (mb:text()=="&Open File") then open_cb()
elseif (mb:text()=="&Insert File") then insert_cb()
elseif (mb:text()=="&Save File") then save_cb()
elseif (mb:text()=="Save File &As") then saveas_cb()
elseif (mb:text()=="E&xit") then exit_cb()

-- EDIT MENU
elseif (mb:text()=="&Undo") then undo_cb()
elseif (mb:text()=="Cu&t") then cut_cb()
elseif (mb:text()=="&Copy") then copy_cb()
elseif (mb:text()=="&Paste") then paste_cb()
elseif (mb:text()=="&Delete") then delete_cb()

-- SEARCH MENU
elseif (mb:text()=="&Find...") then find_cb()
elseif (mb:text()=="Find &Again") then findagain_cb()
elseif (mb:text()=="&Replace...") then replace_cb()
elseif (mb:text()=="Re&place Again") then replaceagain_cb()

-- HELP MENU
elseif (mb:value()==24) then about_cb()
end
end

-- FILE MENU CALLBACKS

function new_cb()
ask_save()
newfile = true
filename = "untitled"
saved = false
tb:remove(1,tb:length())
w:label(title .. filename)
end

function open_cb()
ask_save()
filename = fltk.fl_file_chooser("Select File to open", nil, nil, 0)
if (filename ~= nil) then
tb:loadfile(filename)
w:label(title .. filename)
saved = false
end
end

function insert_cb()
local fname = fltk.fl_file_chooser("Select File to insert", nil, nil, 0)
if (fname ~= nil) then
local pos = ed:insert_position()
tb:insertfile(fname,pos)
end
end

function save_cb()
if (untitled) then
saveas_cb()
elseif (not saved) then
if (tb:savefile(filename)) then
saved = true
fltk.fl_message("File " .. filename .. " Saved.")
else
fltk.fl_alert("Error writing file " .. filename)
end
end

end

function saveas_cb()
local fname = fltk.fl_file_chooser("FILENAME TO SAVE", nil, nil, 0)
if (fname ~= nil) then
if (tb:savefile(fname)) then
filename = fname
w:label(title .. filename)
saved = true
fltk.fl_message("File " .. filename .. " Saved.")
else
fltk.fl_alert("Error writing file " .. filename)
end
end
end

function close_cb()
ask_saved()
end

function exit_cb()
check_save()
end

-- EDIT MENU CALLBACKS
function undo_cb()
end

function cut_cb()
if ( tb:selected() ~= 0) then
clipboard = tb:selection_text()
tb:remove_selection()
end
end

function copy_cb()
if (tb:selected() ~= 0) then
clipboard = tb:selection_text()
end
end

function paste_cb()
local pos = ed:insert_position()
tb:insert(pos,clipboard)
end

function delete_cb()
if (tb:selected() ~= 0) then
tb:remove_selection()
end
end

-- SEARCH MENU CALLBACKS
function find_cb()
local str
local fnd
str = fltk.fl_input("Insert a string to search", lastsearch)
if (str ~= 0) then
fnd = tb:search_forward(0,str,fnd,0)
if (fnd ~= 0) then
tb:select(fnd, tb:word_end(fnd))
else
fltk.fl_message("String " .. str .. "Not found!")
end
end
end

function findagain_cb()
end

function replace_cb()
replace_dlg:show()
end

function replaceagain_cb()
end

-- HELP CALLBACKS
function about_cb()
fltk.fl_message("MURGA LUA FLTK EDITOR\n\nMurga Lua Version of an FLTK editor example\nBy mav_it\n\nVersion " .. version)
end

--- Build Up dynamically the menu:
mb = fltk:Fl_Menu_Bar(0,0,ww,30)
mb:callback(menuItem)

mb:add("&File/&New File", 0, 0)
mb:add("&File/&Open File", 0, 0)
mb:add("&File/&Insert File", 0, 0)
mb:add("&File/&Save File", 0, 0)
mb:add("&File/Save File &As", 0, 0)
mb:add("&File/E&xit", 0, 0)

mb:add("&Edit/&Undo", 0, 0)
mb:add("&Edit/Cu&t", 0, 0)
mb:add("&Edit/&Copy", 0, 0)
mb:add("&Edit/&Paste", 0, 0)
mb:add("&Edit/&Delete", 0, 0)

mb:add("&Search/&Find...", 0, 0)
mb:add("&Search/Find &Again", 0, 0)
mb:add("&Search/&Replace...", 0, 0)
mb:add("&Search/Re&place Again",0, 0)

mb:add("&Help/&About", 0, 0)

--This does not seem to be implemented in MurgaLua FLTK
--tb:add_modify_callback(changed_cb, w)
--tb:call_modify_callbacks()

-- REPLACE DIALOG
replace_dlg = fltk:Fl_Window(300, 105, "Replace")
replace_find = fltk:Fl_Input(70, 10, 200, 25, "Find:")
replace_with = fltk:Fl_Input(70, 40, 200, 25, "Replace:")
replace_all = fltk:Fl_Button(10, 70, 90, 25, "Replace All")
replace_next = fltk:Fl_Return_Button(105, 70, 120, 25, "Replace Next")
replace_cancel = fltk:Fl_Button(230, 70, 60, 25, "Cancel")

-- CALLBACKS FOR REPLACE DIALOG
replace_cancel:callback(function () replace_dlg:hide() end )

-- MAIN PROGRAM
w:show()
Fl:run()

12 replies since Oct. 29 2007,17:38

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Damn Small Linux Board » Non-DSL Topics » Programming and Scripting » murgaLua FLTK Menu System Problems