X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/15b6757b26a0277472a4f6b071b52050abd922da..a25a17732c2d4d34d5d35a5318053dd8c6e29722:/docs/doxygen/overviews/dialog.h diff --git a/docs/doxygen/overviews/dialog.h b/docs/doxygen/overviews/dialog.h index 5deac7b7ca..31806e243a 100644 --- a/docs/doxygen/overviews/dialog.h +++ b/docs/doxygen/overviews/dialog.h @@ -1,103 +1,134 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: dialog +// Name: dialog.h // Purpose: topic overview // Author: wxWidgets team // RCS-ID: $Id$ // Licence: wxWindows license ///////////////////////////////////////////////////////////////////////////// -/*! - - @page dialog_overview wxDialog overview - - Classes: #wxDialog, #wxDialogLayoutAdapter - 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: - - - A surrounding frame is implicitly created. - Extra functionality is automatically given to the dialog box, - such as tabbing between items (currently Windows only). - If the dialog box is @e modal, the calling program is blocked - until the dialog box is dismissed. - - - For a set of dialog convenience functions, including file selection, see - @ref dialogfunctions_overview. - See also #wxTopLevelWindow and #wxWindow for inherited - member functions. Validation of data in controls is covered in @ref validator_overview. - @ref autoscrollingdialogs_overview - - - @section autoscrollingdialogs Automatic scrolling 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 @c wxDIALOG_ADAPTATION_MODE_DEFAULT (use the global setting), @c wxDIALOG_ADAPTATION_MODE_ENABLED or @c wxDIALOG_ADAPTATION_MODE_DISABLED. - 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: - - - If wxDialog::GetContentWindow returns a window derived from wxBookCtrlBase, the pages are made scrollable and - no other adaptation is done. - wxWidgets looks for a #wxStdDialogButtonSizer and uses it for the non-scrolling part. - If that search failed, wxWidgets looks for a horizontal #wxBoxSizer with one or more - standard buttons, with identifiers such as @c wxID_OK and @c wxID_CANCEL. - If that search failed too, wxWidgets finds 'loose' standard buttons (in any kind of sizer) and adds them to a #wxStdDialogButtonSizer. - If no standard buttons were found, the whole dialog content will scroll. - All the children apart from standard buttons are reparented onto a new #wxScrolledWindow object, - using the old top-level sizer for the scrolled window and creating a new top-level sizer to lay out the scrolled window and - standard button sizer. - - - @b Customising scrolling adaptation - 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. - You can also override wxDialog::CanDoLayoutAdaptation and wxDialog::DoLayoutAdaptation in a class derived from wxDialog. - @b Situations where automatic scrolling adaptation may fail - Because adaptation rearranges your sizer and window hierarchy, it is not fool-proof, and may fail in the following situations. - - - The dialog doesn't use sizers. - The dialog implementation makes assumptions about the window hierarchy, for example getting the parent of a control and casting to the dialog class. - The dialog does custom painting and/or event handling not handled by the scrolled window. If this problem can be solved globally, - you can derive a new adapter class from wxStandardDialogLayoutAdapter and override its CreateScrolledWindow function to return an instance of your own class. - The dialog has unusual layout, for example a vertical sizer containing a mixture of standard buttons and other controls. - The dialog makes assumptions about the sizer hierarchy, for example to show or hide children of the top-level sizer. However, the original sizer hierarchy will still hold - until Show or ShowModal is called. - - - You can help make sure that your dialogs will continue to function after adaptation by: - - - avoiding the above situations and assumptions; - using #wxStdDialogButtonSizer; - only making assumptions about hierarchy immediately after the dialog is created; - using an intermediate sizer under the main sizer, a @false top-level sizer that can be relied on to exist - for the purposes of manipulating child sizers and windows; - overriding wxDialog::GetContentWindow to return a book control if your dialog implements pages: wxWidgets will then only make the pages - scrollable. - - - @b wxPropertySheetDialog and wxWizard - 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. - - */ - - +/** + +@page overview_dialog wxDialog Overview + +Classes: wxDialog, wxDialogLayoutAdapter + +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: + +@li A surrounding frame is implicitly created. +@li Extra functionality is automatically given to the dialog box, + such as tabbing between items (currently Windows only). +@li If the dialog box is @e modal, the calling program is blocked + until the dialog box is dismissed. + +For a set of dialog convenience functions, including file selection, see +@ref group_funcmacro_dialog. + +See also wxTopLevelWindow and wxWindow for inherited +member functions. Validation of data in controls is covered in @ref overview_validator. + + +@li @ref overview_dialog_autoscrolling + + +
+ + + +@section overview_dialog_autoscrolling Automatic scrolling 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 @c wxDIALOG_ADAPTATION_MODE_DEFAULT +(use the global setting), @c wxDIALOG_ADAPTATION_MODE_ENABLED or @c wxDIALOG_ADAPTATION_MODE_DISABLED. + +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: + +@li If wxDialog::GetContentWindow returns a window derived from wxBookCtrlBase, + the pages are made scrollable and no other adaptation is done. +@li wxWidgets looks for a wxStdDialogButtonSizer and uses it for the non-scrolling part. +@li If that search failed, wxWidgets looks for a horizontal wxBoxSizer with one or more + standard buttons, with identifiers such as @c wxID_OK and @c wxID_CANCEL. +@li If that search failed too, wxWidgets finds 'loose' standard buttons (in any kind of sizer) + and adds them to a wxStdDialogButtonSizer. + If no standard buttons were found, the whole dialog content will scroll. +@li All the children apart from standard buttons are reparented onto a new ::wxScrolledWindow + object, using the old top-level sizer for the scrolled window and creating a new top-level + sizer to lay out the scrolled window and standard button sizer. + + +@subsection overview_dialog_autoscrolling_custom Customising scrolling adaptation + +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. + +You can also override wxDialog::CanDoLayoutAdaptation and wxDialog::DoLayoutAdaptation +in a class derived from wxDialog. + + +@subsection overview_dialog_autoscrolling_fail Situations where automatic scrolling adaptation may fail + +Because adaptation rearranges your sizer and window hierarchy, it is not fool-proof, +and may fail in the following situations: + +@li The dialog doesn't use sizers. +@li The dialog implementation makes assumptions about the window hierarchy, + for example getting the parent of a control and casting to the dialog class. +@li The dialog does custom painting and/or event handling not handled by the scrolled window. + If this problem can be solved globally, you can derive a new adapter class from + wxStandardDialogLayoutAdapter and override its CreateScrolledWindow function to return + an instance of your own class. +@li The dialog has unusual layout, for example a vertical sizer containing a mixture of + standard buttons and other controls. +@li The dialog makes assumptions about the sizer hierarchy, for example to show or hide + children of the top-level sizer. However, the original sizer hierarchy will still hold + until Show or ShowModal is called. + +You can help make sure that your dialogs will continue to function after adaptation by: + +@li avoiding the above situations and assumptions; +@li using wxStdDialogButtonSizer; +@li only making assumptions about hierarchy immediately after the dialog is created; +@li using an intermediate sizer under the main sizer, a @false top-level sizer that + can be relied on to exist for the purposes of manipulating child sizers and windows; +@li overriding wxDialog::GetContentWindow to return a book control if your dialog implements + pages: wxWidgets will then only make the pages scrollable. + + +@subsection overview_dialog_propertysheet wxPropertySheetDialog and wxWizard + +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. + +*/ +