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Docking windows in MDI

Posted on 1998-02-05
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Last Modified: 2010-08-05
Hello,
I'm building an MDI application, and I want to dock some of the child forms to the MDI (Like VB5 IDE, where you can dock the propery form to the MDI, or undock it).

How can I do that?
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Question by:yronnen
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anthonyc earned 260 total points
ID: 1455764
You can control the form yourself.  The problem is, while you move a form, unless you do some subclassing with the SendMessage WinAPI, you can't tell where a form is WHILE it's being moved.  

One way you could implement this, although not pretty, is with a timer.  If you are using VB5, you can use the timer control or use callbacks with Settimer/killtimer.  I'll describe the timer control method.

1)  Set the timer interval to 1/5th of a second (200).
2)  Build the "dockable" form.  I would recommend using the toolbar form style for this
3)  Have the Timer event of the timer control (put the timer on the MDI form) check the position of the new form, frmDock.
4)  If frmDock is in the range where youd' want to dock it, then go ahead and dock it.  Inside the form, remember the undocked size.

Here is some of the frmDock code you need:

option explicit
dim mintUndockWidth  as integer
dim mintUndockHeight as integer
dim mintUndockLeft   as integer
dim mintUndockTop    as integer

public sub SetUndocked()
   me.move mintUndockLeft, mintUndockTop, mintUndockWidth, mintUndockHeight
end sub

public sub RememberUndocked()
  mintUndockLeft  = me.left
  mintUndockTop   = me.top
  mintUndockHeight = me.height
  mintUndockWidth = me.Width
end sub


--------------

'In the MDI forms timer control timer event
private sub timer1_timer()
   with frmDock
       if .Left <= 0 or .top <= 0 then
           'dock left
           .move 0, 0
       elseif .left >= me.scalewidth - .width then
           .move me.scalewidth - .width, 0
       elseif .top >= me.scaleheight - .height then
           .move 0, me.scaleheight - .height
       end if
    end with
end sub          
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