# Variable tree implementation for Insight.
# Copyright (C) 2002 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License (GPL) as published by
# the Free Software Foundation; either version 2 of the License, or (at
# your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

itcl::body  VarTree::constructor {args} {
  debug $args
  if {!$initialized} {
    _init_data
  }
  eval itk_initialize $args
  
  itk_component add canvas {
    iwidgets::scrolledcanvas $itk_interior.c -autoresize 1 -hscrollmode dynamic -vscrollmode dynamic \
      -background $::Colors(textbg) -borderwidth 0 -highlightthickness 0
  }
  set c [$itk_component(canvas) childsite]
  pack $itk_component(canvas) -side top -fill both -expand 1
  bind $c <1> "[code $this clicked %W %x %y 0]"

  # Add popup menu - we populate it in _but3
  itk_component add popup {
    menu $itk_interior.pop -tearoff 0
  } {}
  set pop $itk_component(popup)
  $pop configure -disabledforeground $::Colors(fg)
  bind $c <3> [code $this _but3 %x %y %X %Y]

  set selection {}
  set selidx {}
  after idle [code $this build]
}

itcl::body  VarTree::destructor {} {
  debug
}

itcl::body  VarTree::build {} {
  debug
  $c delete all
  catch {unset var_to_items}
  catch {unset item_to_var}
  set _y 30
  buildlayer $rootlist 10
  $c config -scrollregion [$c bbox all] -background $::Colors(textbg) -borderwidth 0 -highlightthickness 0
  update 1
  drawselection
}

itcl::body  VarTree::buildlayer {tlist in} {
  set start [expr $_y - 10]

  foreach var $tlist {
    set y $_y
    incr _y 17

    if {$in > 10} {
      $c create line $in $y [expr $in+10] $y -fill $colors(line) 
    }
    set x [expr $in + 12]

    set j1 [$c create text $x $y -text "[$var name] = " -fill $colors(name) -anchor w -font global/fixed]
    set x [expr [lindex [$c bbox $j1] 2] + 5]
    set j2 [$c create text $x $y -text "([$var type])" -fill $colors(type) -anchor w -font global/fixed]
    set x [expr [lindex [$c bbox $j2] 2] + 5]
    if {[catch {$var value} val]} {
      # error accessing memory, etc.
      set j3 [$c create text $x $y -text $val -fill $colors(error) -anchor w -font global/fixed]      
    } else {
      set j3 [$c create text $x $y -text $val -fill $colors(value) -anchor w -font global/fixed]
    }

    set var_to_items($var) [list $j1 $j2 $j3]
    set item_to_var($j1) $var
    set item_to_var($j2) $var
    set item_to_var($j3) $var

    $c bind $j1 <Double-1> "[code $this clicked %W %x %y 1]"
    $c bind $j2 <Double-1> "[code $this clicked %W %x %y 1]"
    $c bind $j3 <Double-1> "[code $this edit $j3];break"

    if {[$var numChildren]} {
      if {[closed $var]} {
	set j [$c create image $in $y -image closedbm]
	$c bind $j <1> "[code $this open $var]"
      } else {
	set j [$c create image $in $y -image openbm]
	$c bind $j <1> "[code $this close $var]"
	buildlayer [$var children] [expr $in+18]
      }
    }
  }
  if {$in > 10} {
    $c lower [$c create line $in $start $in [expr $y+1] -fill $colors(line) ]
  }
}

# add: add a list of varobj to the tree
itcl::body  VarTree::add {var} {
  debug $var
  if {$var == ""} {return}
  set rootlist [concat $rootlist $var]
  after idle [code $this build]
}

# remove: remove a varobj from the tree
# if the name is "all" then remove all
itcl::body  VarTree::remove {name} {
  debug $name
  if {$name == ""} {return}
  if {$name == "all"} {
    set rootlist {}
  } else {
    set rootlist [lremove $rootlist $name]
  }
  after idle [code $this build]
}

# update a var
itcl::body  VarTree::update_var {var enabled check} {
  if {$enabled && $check} {return}
  lassign $var_to_items($var) nam typ val
  if {$enabled} {
    $c itemconfigure $nam -fill $colors(name)
    $c itemconfigure $typ -fill $colors(type)

    if {[catch {$var value} value]} {
      set color $colors(error)      
    } elseif {[$c itemcget $val -text] != $value} {
      set color $colors(change)
    } else {
      set color $colors(value)
    }
    $c itemconfigure $val -text $value -fill $color
  } else {
    $c itemconfigure $nam -fill $colors(disabled)
    $c itemconfigure $typ -fill $colors(disabled)
    $c itemconfigure $val -fill $colors(disabled)
  }
  
  if {![closed $var] && [$var numChildren]} {
    foreach child [$var children] {
      update_var $child $enabled $check
    }
  }
}

# update: update the values of the vars in the tree.
# The "check" argument is a hack we have to do because
# [$varobj value] does not return an error; only [$varobj update]
# does.  So after changing the tree layout in build, we must then
# do an update.  The "check" argument just optimizes things a bit over
# a normal update by not fetching values, just calling update.
itcl::body  VarTree::update {{check 0}} {
  debug

  # delete selection box if it is visible
  if {$selidx != ""} {
    $c delete $selidx
  }

  # update all the root variables
  foreach var $rootlist {
    if {[$var update] == "-1"} {
      set enabled 0
    } else {
      set enabled 1
    }
    update_var $var $enabled $check
  }
}

# Draw the selection highlight
itcl::body  VarTree::drawselection {} {
  #debug "selidx=$selidx selection=$selection"
  if {$selidx != ""} {
    $c delete $selidx
  }
  if {$selection == ""} return
  if {![info exists var_to_items($selection)]} return
  set bbox [eval "$c bbox $var_to_items($selection)"]
  if {[llength $bbox] == 4} {
    set selidx [eval $c create rectangle $bbox -fill $::Colors(sbg) -outline {{}}]
    $c lower $selidx
  } else {
    set selidx {}
  }
}

# button 1 callback
itcl::body  VarTree::clicked {w x y open} {
  #debug "clicked $w $x $y $open"
  set x [$w canvasx $x]
  set y [$w canvasy $y]
  foreach m [$w find overlapping $x $y $x $y] {
    if {[info exists item_to_var($m)]} {
      if {$open} {
	set var $item_to_var($m)
	if {[closed $var]} {
	  set closed($var) 0
	} else {
	  set closed($var) 1
	}
	after idle [code $this build]
      } else {
	setselection $item_to_var($m)
      }
      return
    }
  }
  if {!$open} {
    setselection ""
  }
}


#
# Change the selection to the indicated item
#
itcl::body  VarTree::setselection {var} {
  #debug "setselection $var"
  set selection $var
  drawselection
}

# Check if a node is closed.
# If it is a new node, set it to closed
itcl::body  VarTree::closed {name} {
  if {![info exists closed($name)]} {
    set closed($name) 1
  }
  return $closed($name)
}

# mark a node open
itcl::body  VarTree::open {name} {
  set closed($name) 0
  after idle [code $this build]
}

# mark a node closed
itcl::body  VarTree::close {name} {
  set closed($name) 1
  after idle [code $this build]
}

# edit a varobj.  
# creates an entry widget in place of the current value
itcl::body  VarTree::edit {j} {
  #debug "$j"

  # if another edit is in progress, cancel it
  if {$entry != ""} { unedit $j }

  set entryobj $item_to_var($j)
  set entry [entry $c.entry  -bg $::Colors(bg) -fg $::Colors(fg) -font global/fixed]
  set entrywin [$c create window [$c coords $j] -window $entry -anchor w]
  focus $entry
  bind $entry <Return> [code $this changeValue $j]
  bind $entry <Escape> [code $this unedit $j]
}

# cancel or clean up after an edit
itcl::body  VarTree::unedit {j} {
  #debug
  # cancel the edit
  $c delete $entrywin
  destroy $entry
  set entry ""
  $c raise $j
}

# change the value of a varobj.
itcl::body  VarTree::changeValue {j} {
  #debug "value = [$entry get]"
  set new [string trim [$entry get] \ \r\n]
  if {$new == ""} {
    unedit $j
    return
  }
  if {[catch {$entryobj value $new} errTxt]} {
    # gdbtk-varobj doesn't actually return meaningful error messages
    # so use a generic one.
    set errTxt "GDB could not evaluate that expression"
    tk_messageBox -icon error -type ok -message $errTxt \
      -title "Error in Expression" -parent [winfo toplevel $itk_interior]
    focus $entry
    $entry selection to end
  } else {
    unedit $j
    
    # We may have changed a register or something else that is 
    # being displayed in another window
    gdbtk_update
  }
}

# change the format for a var
itcl::body  VarTree::_change_format {var} {
  #debug "$var $popup_temp"
  catch {$var format $popup_temp}
  after idle [code $this update]
}

# button 3 callback.  Pops up a menu.
itcl::body  VarTree::_but3 {x y X Y} {
  set x [$c canvasx $x]
  set y [$c canvasy $y]
  catch {destroy $pop.format}

  set var ""
  foreach item [$c find overlapping $x $y $x $y] {
    if {![catch {set var $item_to_var($item)}]} {
      break
    }
  }
  setselection $var
  if {$var == ""} {
    _do_default_menu $X $Y
    return
  }
  set popup_temp [$var format]
  set j3 [lindex $var_to_items($var) 2]
  #debug "var=$var [$var name] format=$popup_temp  this=$this"
  $pop delete 0 end
  $pop add command -label [$var name] -state disabled
  $pop add separator
  $pop add cascade -menu $pop.format -label "Format" -underline 0
  set f [menu $pop.format -tearoff 0]
  $f add radio -label "Natural" -variable [scope popup_temp] -value "natural" -command [code $this _change_format $var]
  $f add radio -label "Decimal" -variable [scope popup_temp] -value "decimal" -command [code $this _change_format $var]
  $f add radio -label "Hex" -variable [scope popup_temp] -value "hexadecimal" -command [code $this _change_format $var]
  $f add radio -label "Octal" -variable [scope popup_temp] -value "octal" -command [code $this _change_format $var]
  $f add radio -label "Binary" -variable [scope popup_temp] -value "binary" -command [code $this _change_format $var]
  $pop add command -label "Edit" -command [code $this edit $j3]
  $pop add command -label "Delete" -command [code $this remove $var]
  if {![catch {$var value} value]} {
    $pop add separator   
    $pop add command -label "Dump Memory at [$var name]" -command [list ManagedWin::open MemWin -force -addr_exp [$var name]]
  }
  $pop add separator
  if {$type == "local"} {
    $pop add command -label "Help" -command "open_help watch.html"
  } else {
    $pop add command -label "Help" -command "open_help locals.html"
  }
  $pop add separator
  $pop add command -label "Close" -command "destroy [winfo toplevel $itk_interior]"
  tk_popup $pop $X $Y
}

# popup menu over empty space
itcl::body  VarTree::_do_default_menu {X Y} {
  #debug
  $pop delete 0 end
  if {$type == "local"} {
    $pop add command -label "Local Variables" -state disabled
  } else {
    $pop add command -label "Watch Window" -state disabled
  }
  $pop add separator
  $pop add command -label "Sort" -command [code $this _sort]
  if {$type == "local"} {
    $pop add command -label "Help" -command "open_help watch.html"
  } else {
    $pop add command -label "Help" -command "open_help locals.html"
  }
  $pop add separator
  $pop add command -label "Close" -command "destroy [winfo toplevel $itk_interior]"
  tk_popup $pop $X $Y
}

# alphabetize the variable names in the list
itcl::body  VarTree::_sort {} {
  #debug $rootlist
  set rootlist [lsort -command [code $this _compare] $rootlist]
  after idle [code $this build]
}

# comparison function for lsort.
itcl::body  VarTree::_compare {a b} {
  return [string compare [$a name] [$b name]]
}

# ititialize common data
itcl::body  VarTree::_init_data {} {
  set colors(name) "\#0000C0"
  set colors(type) "red"
  set colors(error) "red"
  set colors(value) "black"
  set colors(change) $::Colors(change)
  set colors(disabled) "gray50"
  set colors(line) "gray50"

  set maskdata "#define solid_width 9\n#define solid_height 9"
  append maskdata {
    static unsigned char solid_bits[] = {
      0xff, 0x01, 0xff, 0x01, 0xff, 0x01, 0xff, 0x01, 0xff, 0x01, 0xff, 0x01,
      0xff, 0x01, 0xff, 0x01, 0xff, 0x01
    };
  }
  set data "#define open_width 9\n#define open_height 9"
  append data {
    static unsigned char open_bits[] = {
      0xff, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x7d, 0x01, 0x01, 0x01,
      0x01, 0x01, 0x01, 0x01, 0xff, 0x01
    };
  }
  image create bitmap openbm -data $data -maskdata $maskdata \
    -foreground black -background white
  set data "#define closed_width 9\n#define closed_height 9"
  append data {
    static unsigned char closed_bits[] = {
      0xff, 0x01, 0x01, 0x01, 0x11, 0x01, 0x11, 0x01, 0x7d, 0x01, 0x11, 0x01,
      0x11, 0x01, 0x01, 0x01, 0xff, 0x01
    };
  }
  image create bitmap closedbm -data $data -maskdata $maskdata \
    -foreground black -background white

  set initialized 1
}