A dialog box is similar to a panel, in that it is a window which can be used for placing controls, with the following exceptions:
For a set of dialog convenience functions, including file selection, see Dialogs.
As an ever greater variety of mobile hardware comes to market, it becomes more imperative for wxWidgets applications to adapt to these platforms without putting too much burden on the programmer. One area where wxWidgets can help is in adapting dialogs for the lower resolution screens that inevitably accompany a smaller form factor. wxDialog therefore supplies a global wxDialogLayoutAdapter class that implements automatic scrolling adaptation for most sizer-based custom dialogs.
Many applications should therefore be able to adapt to small displays with little or no work, as far as dialogs are concerned. By default this adaptation is off. To switch scrolling adaptation on globally in your application, call the static function wxDialog::EnableLayoutAdaptation passing true. You can also adjust adaptation on a per-dialog basis by calling wxDialog::SetLayoutAdaptationMode with one of
wxDIALOG_ADAPTATION_MODE_DEFAULT (use the global setting),
The last two modes override the global adaptation setting. With adaptation enabled, if the display size is too small for the dialog, wxWidgets (or rather the standard adapter class wxStandardDialogLayoutAdapter) will make part of the dialog scrolling, leaving standard buttons in a non-scrolling part at the bottom of the dialog. This is done as follows, in wxDialogLayoutAdapter::DoLayoutAdaptation called from within wxDialog::Show or wxDialog::ShowModal:
In addition to switching adaptation on and off globally and per dialog, you can choose how aggressively wxWidgets will search for standard buttons by setting wxDialog::SetLayoutAdaptationLevel. By default, all the steps described above will be performed but by setting the level to 1, for example, you can choose to only look for wxStdDialogButtonSizer.
You can use wxDialog::AddMainButtonId to add identifiers for buttons that should also be treated as standard buttons for the non-scrolling area.
You can derive your own class from wxDialogLayoutAdapter or wxStandardDialogLayoutAdapter and call wxDialog::SetLayoutAdapter, deleting the old object that this function returns. Override the functions CanDoLayoutAdaptation and DoLayoutAdaptation to test for adaptation applicability and perform the adaptation.
Because adaptation rearranges your sizer and window hierarchy, it is not fool-proof, and may fail in the following situations:
You can help make sure that your dialogs will continue to function after adaptation by:
Adaptation for wxPropertySheetDialog is always done by simply making the pages scrollable, since wxDialog::GetContentWindow returns the dialog's book control and this is handled by the standard layout adapter.
wxWizard uses its own CanDoLayoutAdaptation and DoLayoutAdaptation functions rather than the global adapter: again, only the wizard pages are made scrollable.