Category Archives: Presentation Server

Contains posts about the OpenInsight Presentation Server, which is the module responsible for managing GUI windows and controls on the Windows Desktop.

Reordering tabs with the AllowDragReorder property

The next release of OpenInsight includes a new TABCONTROL property called ALLOWDRAGREORDER, which allows you to drag a tab to a new position within the control. It’s a simple boolean property, and when set to True tabs may be dragged and reordered with the mouse – an image of the tab is moved with the cursor, and a pair of arrows are displayed to mark the potential insertion point.

Here’s an example of a tab being dragged in the IDE:

Shows a image of the IDE with a tab being dragged by a cursor, along with the drag0image and the insertion marker arrows.

Bonus trivia

  • The tabs may be scrolled while dragging by hovering outside either edge of the control.
  • This property is not supported for:
    • MultiLine tab controls
    • Vertically-aligned tab controls
  • The LISTBOX control also supports this property for reordering its items – see the “Order Tabs” dialog in the Form Designer for an example, or the list of types in the IDE’s “Open Entity” dialog.

Screenshots with the CAPTUREIMAGE method

Bitmap controls in OpenInsight 10 have a method called CAPTUREIMAGE, which allows you to “screenshot” the contents of another OI control or form into the Bitmap control’s IMAGE sub-object. As you can see, it has a very simple interface:

SuccessFlag = Exec_Method( BitMapCtrlID, "CAPTUREIMAGE", CaptureID )

Where “CaptureID” is the fully qualified name of the control to screenshot.

E.g.

If we have a form called TEST_CAPTUREIMAGE, with a BITMAP control called BMP_SCREENSHOT, then we can screenshot the contents of the IDE into it like so:

Call Exec_Method( "TEST_CAPTUREIMAGE.BMP_SCREENSHOT", "CAPTUREIMAGE", |
                   "RTI_IDE" )
Shows a captured image of the OpenInsight IDE in a Bitmap control.

(N.B. The captured image you see displayed above is scaled – the screenshot is stored at full resolution in the control itself)

One obvious use for this is for support purposes, e.g:

  • Take a screen-shot with CAPTUREIMAGE.
  • Use The SAVETOFILE method in the IMAGE API to save it to a file.
  • Create an email message with the image file attached or embedded and send it to your support desk.

We’re sure you can think of more.

Bonus trivia:

  • CAPTUREIMAGE works with any object that supports the Windows WM_PRINTCLIENT message.
  • BITMAP controls are basically an alias for STATIC controls, so all STATIC controls support this method.

Context Menu updates

The next release of OpenInsight sees a few updates to context menus and the ContextMenu Designer, so in this post we’ll take a brief look at these upcoming changes.

Moving the focus

One important aspect of standard Windows context menu behavior is that the focus is moved (if possible) to the control that the menu belongs to. Current versions of OpenInsight do not follow this pattern so the next release includes a fix for this, and this is something you should be aware of just in case it impacts your application (though to be honest, we’re not really expecting it to!).

Test-Run support

The Context-Menu Designer now supports the IDE “Test-Run” feature, so that you can see how your context menu will appear when you use it in your application.

When you test-run your context menu you will see a simple dialog box with an edit control (EDL_TEST) and and a static control (TXT_TEST) like so:

Test-run context menu dialog box

Right-clicking either of these controls displays your context menu:

Selecting an item displays it’s fully-qualified name, which has the standard format of:

<windowName> "." <controlName> ".CONTEXTMENU." <itemName>

So, for the test run dialog, it will be one of the following:

"RTI_DSN_CONTEXTMENU_TESTRUN.EDL_TEST.CONTEXTMENU." <itemName>
"RTI_DSN_CONTEXTMENU_TESTRUN.TXT_TEST.CONTEXTMENU." <itemName>

E.g.

Message box showing the name of the menu item that was clicked

Common menu support

The initial release of the ContextMenu Designer in v10.0.8 included check-boxes for two “common menu” options as shown in the screenshot below. Each of these options appends a set of standard menu items to your context menu, and both have been enhanced for the next release and include new artwork as well.

Shows the Content Menu designer with the  "Include OI Menu" and "Include Windows Menu" check-boxes highlighted.

The “OI Menu” appends the following items:

  • Options – Display options for the current control.
  • Help – Display help for the current control.
  • Data Binding – Display data-binding information for the current control.

Whilst the “Windows Menu” appends the following standard “Edit” items instead:

  • Undo
  • Cut
  • Copy
  • Paste
  • Delete
  • Select All

In both cases the default system CONTEXTMENU event (i.e. the event responsible for actually displaying the menu) synchronizes the items to the parent control by using the HELPFLAGS and EDITSTATEFLAGS properties respectively.

(The definition for these items can be found in the SYSPROG “OIMENU_” and “WINMENU_” ContextMenu entities respectively – you may adjust these if you wish, but be aware that they may be overwritten in future OpenInsight updates, so you should make copies in your own application).

The @MENUPARENT pseudo-control name

When using QuickEvents there are several pseudo-control names you can use, such as “@WINDOW”, “@FOCUS” and “@SELF”, that are resolved to a “real” control name at runtime.

However, in order to be able to reference the context menu’s parent control at runtime we’ve introduced a new pseudo-control name called “@MENUPARENT”. This resolves to the name of the control displaying the menu and should be used in place of “@FOCUS” because it is perfectly possible for controls that don’t accept the focus (like Static Text controls) to have a context menu, and @FOCUS would not resolve to the correct value. Note that @MENUPARENT can only be used with MENU QuickEvents for context menu items – it cannot be used with any other type or event.

Shows the @MENUPARENT pseudo-control name being used for a menu QuickEvent

Context menus are an essential part of modern user interface design and we encourage you to use them as much as possible in your own applications – hopefully you’ll find that the tools provided in OpenInsight 10 make this easy to achieve!

The SHOWDATABINDING method

In the next release of OpenInsight we’ve added a new feature that allows you to quickly display runtime databinding information for the controls in your application – the aptly named SHOWDATABINDING method.

It’s a simple method that is supported by all controls, and can be invoked like so:

Call Exec_Method( CtrlEntID, "SHOWDATABINDING" )

If the control is bound to a database table then it displays a view-only dialog of data binding information for that control. The following example shows the information for a bound column in an EditTable control:

Dialog box showing an example of the databinding information displayed via the SHOWDATABINDING method.

The Description, Validation, Heading and Formula attributes all have their own sub-dialog boxes to display their full details.

If the control is not databound a simple message is displayed to inform the user of the fact.

This method can easily be added to menu or contextmenu QuickEvents in your own applications if you wish to expose this information to your users, or just for your own diagnostic purposes.

Implementing a Dropdown Panel dialog

As mentioned in a previous post we added a new “dropdown-panel” dialog to the Database Toolpanel to allow the user to edit the viewing options:

Database Toolpanel Options dialog

Whilst this looked like a fairly simple job it did require a little bit of effort to get it right so we thought we’d share the method with you in case you wished to implement something similar in your own applications.

As this was dropdown panel we wanted it to behave as close as possible to the way that a dropdown list from a ComboBox works, i.e:

  • It appears when a “parent button” is clicked
  • It should appear underneath the parent button, right-justified
  • The parent button should have a pressed appearance while the panel is displayed, and return to it’s normal state when the panel is closed
  • The panel should close when it loses the focus (i.e. it becomes inactive)
  • The Database Toolpanel is updated as each CheckBox is clicked, so there are no “OK” or “Cancel” buttons for this dialog.

So, this seemed to be a fairly straightforward task:

  • On the Database Toolpanel:
    • The parent button’s CheckStyle property was set to True so that it behaves like a CheckBox and stays pressed when clicked, and then unpressed when clicked again.
    • A “SyncButton” OMNIEVENT handler was created for the Database Toolpanel that simply synchronizes the Check property of the button to True if the panel dialog exists, or False otherwise.
  • On the panel dialog:
    • The name of the parent button is passed to the dialog, and in the CREATE event it sets it’s own SYSTEMSIZE property relative to the SYSTEMSIZE of the parent button as required.
    • The INACTIVATED event closes the dialog.
    • When the dialog closes it posts the “SyncButton” OMNIEVENT to the Database Toolpanel

The problem

At first glance it appeared to work fine: the dialog appeared, you could update the view options, and when you clicked away from the panel it closed. Bravo.

The one remaining problem however, is that many users will click the parent button to close the dialog as well as open it – it’s just a natural action. In our case this actually had the effect of showing the dialog again, because the event sequence looked something like this (remember, by default all events in OpenInsight are executed asynchronously):

  • The user clicks the mouse button (down) on the parent button
  • The dialog deactivates and raises an INACTIVATED event
  • The INACTIVATED event executes and closes the dialog, which in turn posts a “SyncButton” OMNIEVENT to the Database ToolPanel
  • The “SyncButton” OMNIEVENT executes and, because the dialog no longer exists, it sets the parent button’s Check property to False
  • The user releases the mouse button (up) on the parent button raising a CLICK event and setting the Check property to True
  • The CLICK event executes and reloads the dialog again because the parent button’s Check property is True

The solution

To solve this we needed a way to jump into that sequence so we could set a flag to control how the synchronization logic behaves – we needed to stop it setting the parent button’s Check property to False if the user had clicked on it.

The solution was to use the parent button’s BUTTONDOWN event, because this runs after the INACTIVATED event, but before the OMNIEVENT, and before the mouse-up click changes the Check property. We made the following three changes:

  • In the BUTTONDOWN handler we set a user-defined property (“@_BUTTONDOWN”) on the parent button to True. This is just to flag the fact that the button was clicked on by the user.
  • In the “SyncButton” OMNIEVENT we check “@_BUTTONDOWN” – if it’s True then we don’t do anything else, otherwise we set parent button’s Check property to False (This means that if the user clicks away from the dialog it closes as normal).
  • In the CLICK event we set “@_BUTTONDOWN” back to False, then look at the parent button’s Check property. If it’s False we don’t do anything, but if it’s True then we reload the dialog.

With these changes the dropdown panel dialog now behaves in a familiar fashion, and closes correctly regardless of how it loses the focus.

The IMAGE Object API (Redux)

Once upon a time, in a blog post far far away, we looked at a very early incarnation of the version 10 Image API which described how images were used with OpenInsight forms and controls. Since then the API has changed quite a bit, so this post gives you a PDF link to a preview of the API documentation which covers the capabilities in the next release, some of which hasn’t been described before.

An overview of the Image API

Many GUI types managed by the Presentation Server support images in one form or another; some have background images, some have glyphs, some have image lists and so on. However, many of these images have properties of their own, and in most cases these image properties are common to all.

Because of this most Presentation Server types that support images expose them as intrinsic “sub-objects”, thorough a model we refer to as the “Image Object API”. The image object’s lifetime is managed by the system and it cannot be programmatically destroyed from Basic+, but it can be manipulated by the Get/Set_Property and Exec_Method functions just like any other Presentation Server object.

The entire Image API is described in the linked PDF below but be aware that not all image objects support all of the API. For example, a PUSHBUTTON type does not support an “INDEX” property for its background image, and its SplitGlyph image doesn’t support an ALIGN property: All such exceptions are documented in the relevant sections that describe each object type.

Supported image types

The Presentation Server supports the following image types via the WIC (Windows Imaging Component) sub-sytem:

  • BMP
  • ICO
  • PNG
  • GIF
  • JPEG
  • TIFF

Image Object Properties

NameDescription
ALIGNSpecifies the horizontal and vertical alignment of the image
within its parent.
AUTOSCALESpecifies if the image should be scaled along with its parent
object.
COLORKEYSpecifies the color in the image that should be treated as the
“transparent color”.
COUNTSpecifies the number of sub-images within an image file.
FILENAMEReturns the name of the image file being displayed.
FILENAMESSpecifies an array of DPI-specific image files to display.
FRAMECOUNTReturns the number of “frames” within an image.
FRAMEDELAYReturns the delay time in milliseconds for a multi-frame image.
FRAMEINDEXSpecifies the frame to display within a multi-frame image.
INDEXSpecifies the index of the sub-image to display within a multiimage file.
OFFSETSpecifies the point within the image (not the object) to begin
drawing from.
ORIGINSpecifies the point within the object (not the image) to begin
drawing from.
SIZEReturns the width and height of the image in pixels
STYLESpecifies how the image is drawn into an object (Tiled,
Stretched, Clipped or Scaled).
TRANSLUCENCYSpecifies the degree of transparency applied to an image when
it is drawn

Image Object Methods

NameDescription
SAVETOFILESaves the current image to a file.
SETHBITMAPLoads an image from a Windows BITMAP handle (HBITMAP).
SETIMAGELoads an image from an array of “raw” image bytes.
SETREPOSIMAGESpecifies the image file(s) using an OpenInsight repository
IMAGE entity.

Here’s the link to the Image Object API PDF – adding animated GIFs to your applications has never been so easy!

Menu Designer update in v10.0.8

Version 10.0.8 has seen each of the Menu Designer tools (Form and Context) get a substantial overhaul, both to fix some bugs and also to improve their usability.  This post will provide a quick overview of what has changed.

The Context Menu Designer

ContextMenu Designer

Context Menu Designer

  • The “Item Properties” have been moved from the IDE Property Panel onto the designer itself, adjacent to the menu structure outline.  The previous layout needed far too much mouse movement between the items and their properties.
  • The ability to specify an image list for the menu has been added (this has always been supported at runtime but was not exposed via the Menu Design tools).
  • Re-added the “OI Menu” and “Windows Menu” options.
    • These are no longer global like they were in version 9.x, rather they are specific to the menu in question.
  • Added back the leading “-” symbol for items that don’t have an image as per version 9.
  • Added back the missing “F11” and “F12” Accelerator Key options
  • Improvements to the validation of item properties, e.g:
    • Better generation of default Item IDs.
    • Better checks for duplicate IDs.
    • Prevent events for POPUP item types.
    • A warning message when indenting/un-indenting items will change the parent item type (for example, indenting an item could cause the preceding ITEM to become a POPUP which would remove any existing event code from it).
  • Added “Shift-key” functionality to the buttons to control “insert before/after” operations (normal operation is “insert before”, pressing Shift changes them “insert after”), i.e:
    • Shift + Insert button for “insert after current item”.
    • Shift + Insert Separator button for “insert separator after current item”.
    • Shift + Paste button for “paste after current item”.
  • Added a full keyboard interface for the menu item structure list-box:
    • F2 (or Double-Click) to edit Item text in place.
    • Enter to insert a new item after the current item and move automatically into  “edit mode” (as per “F2” above).
      • Down arrow on the last item will insert a new item as per above.
      • Esc on a new “untouched” item will delete it.
    • Left key to shift an item and any sub-items to the left (un-indent).
    • Right key to shift an item and any sub-items to the right (indent).
    • Del key to delete items and their child items.
    • Ctrl-C to copy an item and it’s sub-items to the Windows Clipboard.
    • Ctrl-X to cut an item and it’s sub-items to the Windows Clipboard.
    • Ctrl-P to Paste items from the Windows Clipboard into the menu structure.
  • Added a context menu to the menu item structure listbox that duplicates the buttons, and adds the following operations:
    • Reset All Item IDs – processes the entire menu and changes all item IDs to their defaults based on their text and the name of their parent item.
    • Copy All – Copies all items to the Windows Clipboard – useful for duplicating menus from one form to another.
    • Delete All – Removes all items from the menu.
  • You are not asked to save the details for each item as you select items in the designer, but you will be prevented from moving to a different item if there is a validation failure.

The Form Menu Designer

Form Menu Designer

Form Menu Designer

Likewise the Form Menu designer has received the same treatment with a few additional extras:

  • A tab has been added for maintaining Event Scripts.
  • The events tab has colored indicators (orange and blue) to denote if an item has a QuickEvent or an Event Script.
  • More validation:
    • Prevent Separators being top-level items.
    • Prevent events for top-level items (unfortunately they are not supported by the Presentation Server in this version).
  • Syntax checking.
    • Syntax is automatically checked if you attempt to select another item – you will be prevented from moving to a different item if the check fails.

You should be able to catch these improvements in the next release, so please try them out and let us know how they work for you!

OpenInsight 10 and QuickEvent Processing

OpenInsight 10 introduced a couple of changes to how QuickEvents are processed that you may or may not be aware of, so in this post we’ll take a look at them so you can see how they work.

1) QuickEvent arguments are now passed by reference

In previous versions of OpenInsight, arguments passed to QuickEvents were duplicated and passed as copies, which meant that if you altered them in your Commuter Module you wouldn’t see the changes in the calling routine.  As QuickEvents are normally the last item processed in the event chain this is not something you might actually notice, unless perhaps you were using the Forward_Event() procedure from an Event Script.

Event arguments in version 10 are now passed by reference, which means a calling routine will see any changes you make to them.  This is an important point to bear in mind now that it’s possible to alter the order in which QuickEvents are executed in the event chain (see the “Has Priority” flag section below), so be careful when using those arguments in your Commuter Modules.

2) The new “Has Priority” flag

Under normal circumstances QuickEvents are always the last handlers processed in the event chain which normally looks something like this:

  1. Control-specific Event Script
  2. Promoted Events
  3. “System” Promoted Events
  4. QuickEvent

For most purposes this works fine, but there are occasions when you might need to step in front of the system code to do some pre-processing on events such as READ and WRITE, and unfortunately this usually involves writing an Event Script (or a Promoted Event perhaps) to contain your pre-system code like so:

E.g.  Sample pre-WRITE Event Script

Function WRITE( CtrlEntID, CtrlClassID )

   $Insert Logical
   WriteOK = TRUE$

   // Check if we can save the record - if not then WriteOK will be 
   // Set to FALSE$ which will stop the event chain
   GoSub CheckOKToWrite
 
Return WriteOK

However, this removes one of the main advantages of using Commuter Modules in the first place: i.e. the ability to keep all of your code in one place. To alleviate this you could just place your pre-WRITE code in your Commuter Module and call it directly :

Function WRITE( CtrlEntID, CtrlClassID )

   $Insert Logical

   // (Assume Commuter Module ID is the same name as the form with an 
   // "_EVENTS" suffix)
   CommID  = @window[1,"*"] : "_EVENTS"
   WriteOK = Function( @CommID( CtrlEntID, "PREWRITE" ) )
 
Return WriteOK

But then you’re still having to create the Event Script, so you still have a fragment that you need to track.

With version 10 we added a new flag to the QuickEvent handler called “Has Priority”:

QuickEvent definition showing the "Has Priority" flag set

“Has Priority” QuickEvent

If you set this to True the event chain is changed to this instead:

  1. Control-specific Event Script
  2. QuickEvent
  3. Promoted Events
  4. “System” Promoted Events

Which means that you can place something like a WRITE event handler in the Commuter Module, do your pre-processing, and return TRUE$ to allow the system to continue the chain, or use Forward_Event() if you need to do some post processing as well.

Points to note:

  • If you call Set_EventStatus( TRUE$ ) in your Commuter Module QuickEvent handler the event chain is stopped.
  • If you return FALSE$ (“0”) from your Commuter Module QuickEvent handler (and it has to be “0”, not null) the event chain is stopped.

Hopefully this removes the need for Event Scripts for writing pre-system events and should help to keep your applications a little more streamlined and organized, and preserve the benefits of using Commuter Modules.

What is the ENDDIALOG event?

If you’ve been using OpenInsight 10 one of the new features you may have noticed is that forms now have a new event called ENDDIALOG, and in this post we’ll take a brief look at how to use it.

The downsides of modal Dialog_Box programming

There are two primary issues with the classic Dialog_Box/End_Dialog style of programming:

  1. The system has to wait in a loop until the dialog is dismissed, and
  2. This forms a “stack” where the dialogs can only be closed in the order in which they were opened.

Historically the first issue was a bigger problem due to the fact that it tied up the engine thread and maxed out the CPU core it was running on.  This was resolved by moving the dialog “wait loop” into the Presentation Server in version 8, where it could be managed better and the engine thread would effectively “sleep” without consuming resources (prior to this it was a simple Basic+ For/Next loop – very processor intensive).

The second issue still remained however. While it may initially seem logical that modal dialogs should form a “stack” this actually breaks down when they are used from different top-level windows.

For example, suppose I have two instances of the IDE, and I load a modal dialog from the first instance and then another from the second instance.  I can’t close the first before I close the second as the Dialog_Box calls are stacked “inside” the engine.  This is potentially confusing behavior and likely to become a bigger issue if your development moves away from single MDI frames and multiple-monitor setups become more prevalent.

Dialog_Box programming without stacking

The only real way to solve this stacking problem is to break away from the current model of “synchronous” Dialog_Box programming and adopt an “asynchronous” callback model instead.  With this methodology there is no looping at all so the CPU usage stays low and code is only executed as needed, and because the loop is removed there is no stacking either.

The drawback of this approach, however, is that it complicates programming because your code has to be split up into two different sections; one to execute the dialog, and another to respond to the return value.

E.g. Consider a CLICK event handler using the normal approach:

OnClick:
   ... <prepare dialog args> ...
   RetVal = Dialog_Box( "MYDIALOG", DlgParent, DlgParam )
   ... <process RetVal> ...    
Return

… all nice and simple. To do this in an asynchronous fashion would take something like this:

   OnClick:
      ... <prepare dialog args> ...
      Call Dialog_Box( "MYDIALOG", DlgParent, DlgParam  )
   return
   

   OnSomeCallbackEvent:
      // param1 -> DialogID
      // param2 -> RetVal
      Begin Case
         Case ( Param1 == "MYDIALOG" )
            ... <process param2 (RetVal) > ...  
      End Case
   Return

… which is a little more complex.

This approach can actually be taken in any version of OpenInsight, but there’s no framework in place to enforce it and so it ends up needing even more work as the developer needs to find a way to define and target the callback process (E.g. implementing a custom event, using OMNIEVENT, calling a commuter module directly, and so on).

For version 10 we decided to provide that framework so that your code could be structured in a standardized fashion, resulting in some updates to the Dialog_Box and End_Dialog stored procedures and the addition of a new WINDOW event called ENDDIALOG.

Changes to Dialog_Box

Dialog_Box now accepts a new dynamic array argument called “AsyncParams”:

RetVal = Dialog_Box( DialogID, DlgParent, CreateParam, DlgOptions, AsyncParams )

Where AsyncParams is:

<1> An Async flag, to denote it needs to send it's return value to 
    the parent window's ENDDIALOG event

<2> A "cookie" value, which is a simple string passed to the ENDDIALOG 
    event that can be used to identify the returning dialog

e.g.

   AsyncParams    = TRUE$
   AsyncParams<2> = "wibble"

   RetVal = Dialog_Box( "MYDIALOG", DlgParent, DlgParam, "", AsyncParams )

Changes to End_Dialog

This procedure now checks to see if the dialog is in asynchronous mode, and if so it takes the dialog ID, the return value, and the cookie, and sends them to the parent’s ENDDIALOG event, thereby giving us a properly defined framework to implement the callback process.

(Note that the “parent” is considered to be the parent as specified in the originating Dialog_Box call, not the actual runtime PARENT, as these may not be the same thing!).

The new ENDDIALOG event

This event is called from the End_Dialog procedure and accepts three arguments:

DialogID  - name of the dialog that triggered the callback

ReturnVal - the dialog return value passed to End_Dialog

AsyncID   - the cookie value that was passed to Dialog_Box

Example

For the purposes of this example we assume that we are going to launch a simple form called “MY_DIALOG_BOX” using the Dialog_Box function.  The form contains a single EDITLINE control called “EDL_NAME”, and a button called “BTN_OK”.  When BTN_OK is clicked it will get the text from EDL_NAME and return it to the owner with an End_Dialog call like so:

   // CLICK event script for MY_DIALOG_BOX.BTN_OK

   // Get the data the user entered
   Name = Get_Property( @Window : ".EDL_NAME", "TEXT" )
   
   // Return it to the owner window
   Call End_Dialog( @Window, Name )

To launch MY_DIALOG_BOX in asynchronous fashion, do the following from an event on the owner window:

// Launches MY_DIALOG_BOX as a modal Dialog_Box in asynchronous fashion 
// passing it the contents of a variable called CurrName as the CreateParam.
   
AsyncParams = ""
AsyncParams<1> = TRUE$      ; // Async mode
AsyncParams<2> = "GetName"  ; // Optional “AsyncID” param for the 
                            ; // ENDDIALOG event
   
// This code does not halt here - anything the user selects in the dialog
// will be passed back in the ENDDIALOG event 
DlgID = Dialog_Box( "MY_DIALOG_BOX", @Window, CurrName, "", AsyncParams )

In this mode the calling program will NOT halt at the Dialog_Box call and wait for the user to close it. Instead any data returned from the End_Dialog call on MY_DIALOG_BOX.BTN_OK will be passed as an argument to the calling window’s ENDDIALOG event.

The ENDDIALOG event on the parent form would look something like this:

Function ENDDIALOG( CtrlEntID, CtrlClassID, DialogID, DialogValue, AsyncID )
 
// This is an ENDDIALOG event that will be triggered by the End_Dialog 
// call on MY_DIALOG_BOX.BTN_OK when launched in asynchronous mode,
//
// ENDDIALOG is passed three parameters:
//
//   DialogID 
//   DialogValue
//   AsyncID
   
Begin Case
   Case ( DialogID = "MY_DIALOG_BOX" )
      // This is optional but we can check AsyncID if we wanted to have
      //  more fine grain control over how this event is processed.
      If ( AsyncID == "GetName" ) Then
         Call Do_Something_With_This_Name( NewName )
      End
End Case 

Return 0

More details on using the ENDDIALOG event can be found in the online help for the Dialog_Box and End_Dialog procedures in version 10.

OLE Control improvements in v10.0.8

We added quite a bit of design-time functionality for OLE controls in v10.0.8 so this post provides a quick overview of what’s new:

The CLSID property

This property has a new “editor” dialog.  While it doesn’t allow you to change the CLSID (that’s by design – if you change the CLSID it’s a totally different control!) it does provide you with a lot of information about the control question such as it’s Registry attributes and it’s properties, methods and events, e.g:

OLE Control CLSID General Tab

OLE Control CLSID Properties Tab

OLE Control CLSID Methods Tab

OLE Control CLSID Events Tab

The QualifiedOleEvents property

This property has a new editor that allows you to specify which OLE events you wish to qualify when the control is created, hopefully removing the need for you to do this in code:

OLE Control QualifiedOleEvents Editor

The OLE Properties section

We’ve also added a new category called “OLE” to the properties displayed in the IDE Property Panel, and this contains all of the design-time OLE properties that can be edited for the control:

OLE Properties in the IDE Property Panel

You may also notice that we’ve added some property type-support for editing OLE properties here as well:

  • Color properties can now use the standard Color property editor
  • Fonts can now be edited with the standard Windows Font dialog
  • Enumerated types are edited with a dropdown list showing the “internal” and “external values, e.g:

OLE Enumerated Properties dropdown

Hopefully this will make working with OLE controls and OpenInsight 10 easier for you in the future.