Creating Zoom Functionality
One of the popular Advanced Revelation (AREV) interface features that was not ported to the OpenInsight development environment was the ability to zoom into an edit-type control and expand the edit area. This feature was typically invoked by pressing F3 when the cursor was in such a control.
Like most other AREV features that weren’t ported to OpenInsight, this feature is easily implemented in OpenInsight as demonstrated in this example.
In OpenInsight, the Zoom functionality can be implemented within an MDI frame, by calling a user-written Zoom procedure from within a menu item called ZOOM. This menu item will be invoked when the user presses F3, as happens in AREV.
First, we create the Zoom form, which is called as a modal dialog box using the Dialog_Box() function call. Create an OpenInsight form like the one below. This form contains an edit box with a vertical scrollbar, and two push button controls labeled OK and Cancel. Assign the following control names:
window: ZOOM
edit box: EB_TEXT
The form is illustrated below:
