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Dynamic Dialog Box Creation

Posted on 1998-08-31
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Last Modified: 2013-12-26
My application has a main window that occupies about a eighth of the screen.  This contains several Owner Drawn option buttons which trap a left double click.  Is there a way of creating a dialog box dynamically ( ie not based on a resource script ) when the button is double clicked.  The reason for this is that the number of controls that appear in the dialog box will vary.  If a dialog box can not be used, is it possible to create another window outside of the main window's client area ?
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Question by:hnc5013
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duneram earned 180 total points
ID: 1299767
Yes you can, but did you know you can do some tricks that are pretty cool with resources that are prebuilt?

One trick you can do is to pre-create all the controls you expect to see in all permutations of your dialog and move them off of the actual dialog.  Make your dialog small.  click on a control in the resource editor and then click on the area outside of boundaries of your dialog. the control will appear there.

At SetupWindow time, you size your dialog using SetWindowPos api and GetSystemMetrics using SM_CXSCREEN and SM_CYSCREEN.

When a button is 'double clicked' you invoke a TDialog *x = new TDialog(....333...) /* assuming 333 was your resource id */

When various events occur in your dialog, you just
1) hide the old controls (turn off the visible flag)
2) move the new controls onto the proper position in your dialog
3) make the new controls visible

and you are done.

Its very painless.   VC won't let you do this very easily.  Using Borland's method, its painless and works quite well.

You can change the size of  your dialog with the SetWindowPos API.

Good Luck!!
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Expert Comment

by:MostlyWater
ID: 1299768
There is one problem to dunerams answer :
Editing the controls painted in the resource editor can be quite painful if the elements are on top of each other.
If you do not wish to do that, you will need the new TStatic() , Create() and ShowWindow() (possibly also MoveWindow() functions to place your dialog elements.
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by:duneram
ID: 1299769
Mostlywater, true,  but the resource editor lets you associate controls with a dialog but you don't have to place them on the dialog.  For design, just make the dialog huge.  place all the controls in separate places.  When done with design, shrink the dialog to your desired size (or do that at run time too).
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Author Comment

by:hnc5013
ID: 1299770
Thanks for your responses.  I created a blank Dialog and adjusted the size of this at runtime using SetWindowPos.  Instead of creating a number of controls and placing them outside of the dialog box I used a linked list to fill the dialog with a number of TGauges.  This works well however there are situations where it is not possible to display all the gauges in one dialog.  I have also trapped the EvPaint messages to enable the printing of text within the dialog.  

Could you tell me how to use a vertical scroll bar within a dialog box and which class to use ( TScroller, TScrollBar ) ?

Do I have to include the vertical scroll bar within the dialog resource script and hide it when the child controls fit within the dialog box or do I create a new scroll bar when required ?

Finally what messages should I trap and what functions do I need in order for the dialog contents to scroll ( do I adjust the positions of the gauges by altering the Y-Pos value which is decided by the position of the scroll bar thumb ) ?

Thanks again for your help !
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