4D v13
Form inheritance
- Self-training
-
- Fundamentals
- Introduction
- First steps in 4D
- Presentation of the final database
- Forms and buttons
- Display at startup
- Menu bars
- Page 0 and page 1
- Form and navigation pages
- Tables, fields
- Relations
- Entry, deletion
- Importing
- Output forms
- Queries and sorts
- Quick reports - exports
- Query by formula, applying a formula
- Form inheritance
- Printing forms
- Handling form objects
- Object properties
- Calculations and formulas
- Overview of variables
- Tracing and debugging
- Generic programming (without pointers)
- Pointers
- Events
- Arrays, pop-ups, list boxes
- Windows and navigation
- Triggers
- Current selection
- Sets and named selections
- Processes
- XLIFF and translation
- 4DWrite Plugin
- Switching to client/server mode
- SQL
- BLOBs
- Components
- SVG
- Web Server
- Download
4D v13
Form inheritance
Form inheritance
In addition to the manipulations explained in the video, you should also note that:
- Theoretically, there is no limit for inheritance; a form can be inherited from another form that is itself inherited from yet another form, and so on.
- A parent form is a full-fledged form. It can consist of several pages including a page 0. Within the framework of inheritance, only pages 0 and 1 of the parent form are visible on child forms.
Create at least one inherited form:
- for your list forms
- another for input forms
- and a last one for information or settings forms.
In certain cases, you may need for a parent form object to be hidden or only available according to the context or the table concerned.
- In the case of a button, you can disable it using the DISABLE BUTTON command
- If you want to hide an object, you can use the OBJECT SET VISIBLE command
- You can also use the OBJECT MOVE command
PROPERTIES
Product: 4D
Theme: Form inheritance
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