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5. Modal, non-modal or MDI windows
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The applications created with WINDEV can use several types of windows (and mix each one of these types).

Modal windows

A modal window is opened in the foreground of the application and it locks the access to the other windows that are already opened (if any). In most cases, the modal windows are used as:
  • main windows of an application,
  • dialog boxes whose validation triggers an action.
With WINDEV, when a modal window is opened, a gray shadow appears on the windows displayed in the background: it is the DDW feature or Dim Disabled Windows.

Non-modal windows

A non-modal window is opened in parallel of other application windows. Each window remains accessible. In most cases, the non-modal windows are used:
  • as tool palettes,
  • as dialog boxes whose modification directly affects the main window.
In this example, each description window of a shirt is used to open the description window of another shirt. All the opened windows remain accessible.

MDI windows

In an MDI application, all the application windows are displayed in the same main window: the MDI parent window. Two types of windows can be found in the MDI applications:
MDI parent window: All other application windows are displayed in this window. This window allows the user to handle the main application menu.
MDI child window: Application window displayed in the parent window. The user will be able to type information in these windows.
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