[GPS] Sun May 12, 2002: A resize handle is that funky thing usually on the bottom right of a window that you can use to resize a window.  My version is slightly different, because it works with internal/MDI windows, and toplevel root parented windows.  The interface commands are widget:resizeHandle and widget:resizeHandle:internal
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  #!/bin/wish8.3
  
  image create bitmap widget:resizeHandle:image -data {
  #define resizeHandle_width 25
  #define resizeHandle_height 25
  static unsigned char resizeHandle_bits[] = {
     0x40, 0x10, 0x04, 0x01, 0x20, 0x08, 0x82, 0x00, 0x10, 0x04, 0x41, 0x00,
     0x08, 0x82, 0x20, 0x00, 0x04, 0x41, 0x10, 0x00, 0x82, 0x20, 0x08, 0x00,
     0x41, 0x10, 0x04, 0x01, 0x20, 0x08, 0x82, 0x00, 0x10, 0x04, 0x41, 0x00,
     0x08, 0x82, 0x20, 0x00, 0x04, 0x41, 0x10, 0x00, 0x82, 0x20, 0x08, 0x00,
     0x41, 0x10, 0x04, 0x01, 0x20, 0x08, 0x82, 0x00, 0x10, 0x04, 0x41, 0x00,
     0x08, 0x82, 0x20, 0x00, 0x04, 0x41, 0x10, 0x00, 0x82, 0x20, 0x08, 0x00,
     0x41, 0x10, 0x04, 0x01, 0x20, 0x08, 0x82, 0x00, 0x10, 0x04, 0x41, 0x00,
     0x08, 0x82, 0x20, 0x00, 0x04, 0x41, 0x10, 0x00, 0x82, 0x20, 0x08, 0x00,
     0x41, 0x10, 0x04, 0x00};
  }
  
  proc widget:resizeHandle:event:ButtonPress-1 {win resizeWin X Y} {
    upvar #0 _resizeHandle$win ar
    set ar(startX) $X
    set ar(startY) $Y
    set ar(minWidth) [image width widget:resizeHandle:image]
    set ar(minHeight) [image height widget:resizeHandle:image]
    set ar(resizeWinX) [winfo x $resizeWin]
    set ar(resizeWinY) [winfo y $resizeWin]
  }
  
  proc widget:resizeHandle:event:B1-Motion {win resizeWin internal X Y} {
    upvar #0 _resizeHandle$win ar
  
    set xDiff [expr {$X - $ar(startX)}]
    set yDiff [expr {$Y - $ar(startY)}]
    
    set oldWidth [winfo width $resizeWin]
    set oldHeight [winfo height $resizeWin]
    
    set newWidth [expr {$oldWidth + $xDiff}]
    set newHeight [expr {$oldHeight + $yDiff}]
    
    if {$newWidth < $ar(minWidth) || $newHeight < $ar(minHeight)} {
      return
    }
    
    if {$internal == 0} {
      if {$ar(resizeWinX) >= 0} {
        set newX "+$ar(resizeWinX)"
      }
      if {$ar(resizeWinY) >= 0} {
        set newY "+$ar(resizeWinY)"
      }
  
      wm geometry $resizeWin ${newWidth}x${newHeight}${newX}${newY}
    } else {
      place $resizeWin -width $newWidth -height $newHeight -x $ar(resizeWinX) -y $ar(resizeWinY)
    }
  
    set ar(startX) $X
    set ar(startY) $Y
  }
  
  proc widget:resizeHandle:event:Destroy {win} {
    upvar #0 _resizeHandle$win ar
    #catch because this may not be set
    catch {array unset ar}
  }
  
  proc widget:resizeHandle {win resizeWin args} {
    eval label [concat $win $args -image widget:resizeHandle:image]
    
    bind $win <ButtonPress-1> "widget:resizeHandle:event:ButtonPress-1 $win $resizeWin %X %Y"
    bind $win <B1-Motion> "widget:resizeHandle:event:B1-Motion $win $resizeWin 0 %X %Y"
    bind $win <Destroy> "widget:resizeHandle:event:Destroy $win"
    return $win
  }
  
  proc widget:resizeHandle:internal {win resizeWin args} {
    eval label [concat $win $args -image widget:resizeHandle:image]
  
    bind $win <ButtonPress-1> "widget:resizeHandle:event:ButtonPress-1 $win $resizeWin %X %Y"
    bind $win <B1-Motion> "widget:resizeHandle:event:B1-Motion $win $resizeWin 1 %X %Y"
    bind $win <Destroy> "widget:resizeHandle:event:Destroy $win"
    return $win
  }
  
  #Test code
  proc main {argc argv} {
    option add *Frame.background #909090
    option add *background #b0b0b0
    option add *foreground black
    option add *activeBackground #b0a090
  
    wm title . "Internal resizeHandle Demo"
    
    pack [button .exit -text "Press to Exit" -command exit] -side top
    pack [button .b -text Destroy -command {destroy .resizeFrame}] -side top
    #widget:resizeHandle doesn't work with a window managed with -relx or -rely.
    #It also only works with the place manager at the moment.
    place [frame .resizeFrame -bg royalblue -bd 2 -relief raised -width 250 -height 250] -x 40 -y 60
    pack [message .resizeFrame.msg -text "This would normally be a window with a titlebar for movement.\
   If you have a need for such a thing look at the internal movable windows page on the Tcl'ers Wiki."] -side top
    
    pack [widget:resizeHandle:internal .resizeFrame.resizeHandle .resizeFrame] -side bottom -anchor e

    toplevel .t
    wm transient .t .
    wm title .t "Toplevel resizeHandle Demo"
    
    pack [button .t.exit -text "Press to Exit" -command exit] -anchor c
    pack [frame .t.bottomFrame] -side bottom -anchor e
    pack [widget:resizeHandle .t.bottomFrame.resizeHandle .t] -side left
  }
  main $argc $argv
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