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Re: How to add to Edit Text default context menu

• Posted by ghaberek (admin) Nov 27, 2013
• 2101 views

Here is an example of something I've done a few times. You can trap the WM_CONTEXTMENU message using w32HEvent and then display your own Popup menu instead. It's really quite straight-forward. From there you can use whatever menu you'd like. In this example, I've added the control key shortcuts and an "About" menu option.

-- w32Text.ew 
-- Here are several extra Win32Lib EditText functions 
-- 
-- can_clear() 
-- can_copy() 
-- can_cut() 
-- can_paste() 
-- can_select() 
-- can_undo() 
-- get_selection() 
-- select_all() 
-- 
 
include Win32Lib.ew 
 
public function get_selection( integer id ) 
     
    atom result = sendMessage( id, EM_GETSEL, 0, 0 ) 
     
    integer index = w32lo_word( result ) 
    integer range = w32hi_word( result ) 
     
    return {index,range} 
end function 
 
public function can_undo( integer id ) 
    return sendMessage( id, EM_CANUNDO, 0, 0 ) 
end function 
 
public function can_cut( integer id ) 
    sequence sel = get_selection( id ) 
    return (sel[2] - sel[1]) > 0 
end function 
 
public function can_copy( integer id ) 
    sequence sel = get_selection( id ) 
    return (sel[2] - sel[1]) > 0 
end function 
 
public function can_paste( integer id ) 
    return w32Func( xIsClipboardFormatAvailable, {CF_TEXT} ) 
end function 
 
public function can_clear( integer id ) 
    sequence sel = get_selection( id ) 
    return (sel[2] - sel[1]) > 0 
end function 
 
public function can_select( integer id ) 
    sequence text = getText( id ) 
    return length( text ) > 0 
end function 
 
public procedure select_all( integer id ) 
    setIndex( id, {1,0} ) 
end procedure 

-- context.exw 
-- Custom context menu example 
 
-- WM_CONTEXTMENU message 
-- http://msdn.microsoft.com/en-us/library/windows/desktop/ms647592%28v=vs.85%29.aspx 
 
include Win32Lib.ew 
include w32Text.ew 
without warning 
 
constant WM_CONTEXTMENU = #007B 
 
constant 
    Main            = create( Window, "Context", 0, Default, Default, 640, 480, 0 ), 
    Text            = create( MleText, "", Main, 0, 0, 0, 0, 0 ), 
$ 
 
constant 
    Context_Menu    = create( Popup, "", 0, 0, 0, 0, 0, 0 ), 
    Context_Undo    = create( MenuItem, "&Undo\tCtrl+Z", Context_Menu, 0, 0, 0, 0, 0 ), 
    Context_Sep1    = create( MenuItem, "-", Context_Menu, 0, 0, 0, 0, 0 ), 
    Context_Cut     = create( MenuItem, "Cu&t\tCtrl+X", Context_Menu, 0, 0, 0, 0, 0 ), 
    Context_Copy    = create( MenuItem, "&Copy\tCtrl+C", Context_Menu, 0, 0, 0, 0, 0 ), 
    Context_Paste   = create( MenuItem, "&Paste\tCtrl+V", Context_Menu, 0, 0, 0, 0, 0 ), 
    Context_Delete  = create( MenuItem, "Delete\tDel", Context_Menu, 0, 0, 0, 0, 0 ), 
    Context_Sep2    = create( MenuItem, "-", Context_Menu, 0, 0, 0, 0, 0 ), 
    Context_Select  = create( MenuItem, "Select &All\tCtrl+A", Context_Menu, 0, 0, 0, 0, 0 ), 
    Context_Sep3    = create( MenuItem, "-", Context_Menu, 0, 0, 0, 0, 0 ), 
    Context_About   = create( MenuItem, "About...", Context_Menu, 0, 0, 0, 0, 0 ), 
$ 
 
setFont( Text, "Courier New", 10, Normal ) 
removeStyle( Text, WS_BORDER ) -- remove the border 
 
procedure Main_OnResize( integer self, integer event, sequence params ) 
     
    -- resize the text control to fit 
    setRect( Text, {w32Edge,0}, {w32Edge,0}, {w32Edge,0}, {w32Edge,0}, w32True ) 
     
end procedure 
setHandler( Main, w32HResize, routine_id("Main_OnResize") ) 
 
procedure Text_OnEvent( integer self, integer event, sequence params ) 
     
    atom winmsg = params[1] 
    atom wparam = params[2] 
    atom lparam = params[3] 
     
    if winmsg = WM_CONTEXTMENU then 
        -- process the context menu message 
         
        -- get the context menu location 
        integer x = w32lo_word( lparam ) 
        integer y = w32hi_word( lparam ) 
         
        -- update the context menu options 
        setEnable( Context_Undo,   can_undo(self)   ) 
        setEnable( Context_Cut,    can_cut(self)    ) 
        setEnable( Context_Copy,   can_copy(self)   ) 
        setEnable( Context_Paste,  can_paste(self)  ) 
        setEnable( Context_Delete, can_clear(self)  ) 
        setEnable( Context_Select, can_select(self) ) 
         
        -- translate the coordinates 
        sequence posn = ScreenToClient( Main, x, y ) 
         
        -- show the menu 
        popup( Context_Menu, posn[1], posn[2] ) 
         
        -- return true to show we processed this message 
        returnValue( w32True ) 
         
    end if 
     
end procedure 
setHandler( Text, w32HEvent, routine_id("Text_OnEvent") ) 
 
procedure Text_OnKeyDown( integer self, integer event, sequence params ) 
     
    integer keyCode = params[1] 
    integer shift = params[2] 
     
    if and_bits( shift, ControlMask ) = ControlMask and keyCode = 'A' then -- Ctrl+A 
         
        select_all( Text ) 
         
        -- return true to show we processed this message 
        returnValue( w32True ) 
         
    end if 
     
end procedure 
setHandler( Text, w32HKeyDown, routine_id("Text_OnKeyDown") ) 
 
procedure Undo_OnClick( integer self, integer event, sequence params ) 
     
    undo( Text ) 
     
end procedure 
setHandler( Context_Undo, w32HClick, routine_id("Undo_OnClick") ) 
 
procedure Cut_OnClick( integer self, integer event, sequence params ) 
     
    cut( Text ) 
     
end procedure 
setHandler( Context_Cut, w32HClick, routine_id("Cut_OnClick") ) 
 
procedure Copy_OnClick( integer self, integer event, sequence params ) 
     
    copy( Text ) 
     
end procedure 
setHandler( Context_Copy, w32HClick, routine_id("Copy_OnClick") ) 
 
procedure Paste_OnClick( integer self, integer event, sequence params ) 
     
    paste( Text ) 
     
end procedure 
setHandler( Context_Paste, w32HClick, routine_id("Paste_OnClick") ) 
 
procedure Delete_OnClick( integer self, integer event, sequence params ) 
     
    clear( Text ) 
     
end procedure 
setHandler( Context_Delete, w32HClick, routine_id("Delete_OnClick") ) 
 
procedure Select_OnClick( integer self, integer event, sequence params ) 
     
    select_all( Text ) 
     
end procedure 
setHandler( Context_Select, w32HClick, routine_id("Select_OnClick") ) 
 
procedure About_OnClick( integer self, integer event, sequence params ) 
     
    sequence about_text = "Context menu example\n" 
        & "\n" 
        & "by Gregory Haberek\n" 
        & "<ghaberek@gmail.com>" 
     
    message_box( about_text, "About", MB_ICONINFORMATION ) 
     
end procedure 
setHandler( Context_About, w32HClick, routine_id("About_OnClick") ) 
 
WinMain( Main, Normal ) 

-Greg