Update Sizer Overview
Remove references to concrete GUI-building programs. Such references are not necessary not to mention that most of the referred programs have not been maintained for a long time. List of flags in the CreateButtonSizer sizer was unnecessary, some of the values were not valid flags for the methods and comment descriptions for most values did not make much sense in the given context. The section was therefore removed and the method is mentioned in the newly-added part about wxStdDialogButtonSizer. Sizer types not mentioned in the overview before were added, the rest of changes was mostly adding @c and such.
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@ -15,10 +15,7 @@ Sizers, as represented by the wxSizer class and its descendants in the
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wxWidgets class hierarchy, have become the method of choice to define the
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layout of controls in dialogs in wxWidgets because of their ability to create
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visually appealing dialogs independent of the platform, taking into account
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the differences in size and style of the individual controls. Unlike the
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original wxWidgets Dialog Editor, editors such as wxDesigner, DialogBlocks,
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XRCed and wxWorkshop create dialogs based exclusively on sizers, practically
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forcing the user to create platform independent layouts without compromises.
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the differences in size and style of the individual controls.
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The next section describes and shows what can be done with sizers. The
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following sections briefly describe how to program with individual sizer
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@ -27,8 +24,8 @@ classes.
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For information about the wxWidgets resource system, which can describe
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sizer-based dialogs, see the @ref overview_xrc.
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@see wxSizer, wxBoxSizer, wxStaticBoxSizer, wxGridSizer, wxFlexGridSizer,
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wxGridBagSizer
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@see wxSizer, wxBoxSizer, wxStaticBoxSizer, wxStdDialogButtonSizer, wxWrapSizer,
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wxGridSizer, wxFlexGridSizer, wxGridBagSizer
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@ -53,7 +50,7 @@ without problems. For example, if the standard font as well as the overall
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design of Linux/GTK widgets requires more space than on Windows, the initial
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dialog size will automatically be bigger on Linux/GTK than on Windows.
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There are currently five different kinds of sizers available in wxWidgets. Each
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There are currently seven different kinds of sizers available in wxWidgets. Each
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represents either a certain way to lay out dialog items in a dialog or it
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fulfills a special task such as wrapping a static box around a dialog item (or
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another sizer). These sizers will be discussed one by one in the text below.
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@ -111,26 +108,24 @@ the bottom:
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offered more space than its children and their borders need, the question
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arises how to distribute the surplus space among the children. For this
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purpose, a stretch factor may be assigned to each child, where the default
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value of 0 indicates that the child will not get more space than its requested
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value of @c 0 indicates that the child will not get more space than its requested
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minimum size. A value of more than zero is interpreted in relation to the sum
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of all stretch factors in the children of the respective sizer, i.e. if two
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children get a stretch factor of 1, they will get half the extra space each
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children get a stretch factor of @c 1, they will get half the extra space each
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<em>independent of whether one control has a minimal sizer inferior to the
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other or not</em>. The following sample shows a dialog with three buttons, the
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first one has a stretch factor of 1 and thus gets stretched, whereas the other
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two buttons have a stretch factor of zero and keep their initial width:
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first one has a stretch factor of @c 1 and thus gets stretched, whereas the other
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two buttons have a stretch factor of @c 0 and keep their initial width:
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@image html overview_sizer_07.png
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Within wxDesigner, this stretch factor gets set from the @e Option menu.
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@section overview_sizer_hiding Hiding Controls Using Sizers
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You can hide controls contained in sizers the same way you would hide any
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control, using the wxWindow::Show method. However, wxSizer also offers a
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control, using the wxWindow::Show() method. However, wxSizer also offers a
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separate method which can tell the sizer not to consider that control in its
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size calculations. To hide a window using the sizer, call wxSizer::Show. You
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size calculations. To hide a window using the sizer, call wxSizer::Show(). You
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must then call Layout on the sizer to force an update.
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This is useful when hiding parts of the interface, since you can avoid removing
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@ -209,25 +204,25 @@ when adding a window (or another sizer) to a sizer. It is interpreted as a
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weight factor, i.e. it can be zero, indicating that the window may not be
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resized at all, or above zero. If several windows have a value above zero, the
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value is interpreted relative to the sum of all weight factors of the sizer, so
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when adding two windows with a value of 1, they will both get resized equally
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when adding two windows with a value of @c 1, they will both get resized equally
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much and each half as much as the sizer owning them. Then what do we do when a
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column sizer changes its width? This behaviour is controlled by @e flags (the
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second parameter of the Add() function): Zero or no flag indicates that the
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window will preserve it is original size, wxGROW flag (same as wxEXPAND) forces
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the window to grow with the sizer, and wxSHAPED flag tells the window to change
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it is size proportionally, preserving original aspect ratio. When wxGROW flag
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is not used, the item can be aligned within available space. wxALIGN_LEFT,
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wxALIGN_TOP, wxALIGN_RIGHT, wxALIGN_BOTTOM, wxALIGN_CENTER_HORIZONTAL and
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wxALIGN_CENTER_VERTICAL do what they say. wxALIGN_CENTRE (same as
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wxALIGN_CENTER) is defined as (wxALIGN_CENTER_HORIZONTAL |
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wxALIGN_CENTER_VERTICAL). Default alignment is wxALIGN_LEFT | wxALIGN_TOP.
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window will preserve it is original size, @c wxGROW flag (same as @c wxEXPAND) forces
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the window to grow with the sizer, and @c wxSHAPED flag tells the window to change
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it is size proportionally, preserving original aspect ratio. When @c wxGROW flag
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is not used, the item can be aligned within available space. @c wxALIGN_LEFT,
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@c wxALIGN_TOP, @c wxALIGN_RIGHT, @c wxALIGN_BOTTOM, @c wxALIGN_CENTER_HORIZONTAL
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and @c wxALIGN_CENTER_VERTICAL do what they say. @c wxALIGN_CENTRE (same as
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@c wxALIGN_CENTER) is defined as (<tt>wxALIGN_CENTER_HORIZONTAL | wxALIGN_CENTER_VERTICAL</tt>).
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Default alignment is <tt>wxALIGN_LEFT | wxALIGN_TOP</tt>.
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As mentioned above, any window belonging to a sizer may have a border, and it
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can be specified which of the four sides may have this border, using the wxTOP,
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wxLEFT, wxRIGHT and wxBOTTOM constants or wxALL for all directions (and you may
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also use wxNORTH, wxWEST etc instead). These flags can be used in combination
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can be specified which of the four sides may have this border, using the @c wxTOP,
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@c wxLEFT, @c wxRIGHT and @c wxBOTTOM constants or wxALL for all directions (and you may
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also use @c wxNORTH, @c wxWEST etc instead). These flags can be used in combination
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with the alignment flags above as the second parameter of the Add() method
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using the binary or operator |. The sizer of the border also must be made
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using the binary @c or operator @c |. The sizer of the border also must be made
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known, and it is the third parameter in the Add() method. This means, that the
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entire behaviour of a sizer and its children can be controlled by the three
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parameters of the Add() method.
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@ -273,8 +268,8 @@ MyDialog::MyDialog(wxFrame *parent, wxWindowID id, const wxString &title )
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}
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@endcode
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Note that the new way of specifying flags to wxSizer is via wxSizerFlags. This
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class greatly eases the burden of passing flags to a wxSizer.
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Note that the recommended way of specifying flags to wxSizer is via wxSizerFlags.
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This class greatly eases the burden of passing flags to a wxSizer.
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Here's how you'd do the previous example with wxSizerFlags:
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@ -319,44 +314,32 @@ MyDialog::MyDialog(wxFrame *parent, wxWindowID id, const wxString &title )
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@section overview_sizer_types Other Types of Sizers
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wxStaticBoxSizer is a sizer derived from wxBoxSizer but adds a static box
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around the sizer. The static box may be either created independently
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or the sizer may create it itself as a convenience.
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wxStdDialogButtonSizer is a sizer that creates button layouts in dialogs
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which conform to the standard button spacing and ordering defined by
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the platform or toolkit's user interface guidelines (if such things exist).
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As a convenience, wxDialog::CreateButtonSizer() can be used to create this sizer.
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wxWrapSizer is a sizer that lays out its items in a single line, like a box
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sizer – as long as there is space available in that direction. Once all available
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space in the primary direction has been used, a new line is added and items
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are added there.
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wxGridSizer is a sizer which lays out its children in a two-dimensional table
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with all table fields having the same size, i.e. the width of each field is the
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width of the widest child, the height of each field is the height of the
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tallest child.
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wxGridBagSizer is a rather special kind of sizer which, unlike the other
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classes, allows to directly put the elements at the given position in the
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sizer. Please see its documentation for more details.
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wxFlexGridSizer is a sizer which lays out its children in a two-dimensional
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table with all table fields in one row having the same height and all fields in
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one column having the same width, but all rows or all columns are not
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necessarily the same height or width as in the wxGridSizer.
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wxStaticBoxSizer is a sizer derived from wxBoxSizer but adds a static box
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around the sizer. Note that this static box has to be created separately.
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wxGridBagSizer is a rather special kind of sizer which, unlike the other
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classes, allows to directly put the elements at the given position in the
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sizer. Please see its documentation for more details.
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@section overview_sizer_button CreateButtonSizer
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As a convenience, wxDialog::CreateButtonSizer(long flags) can be used to create a
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standard button sizer in which standard buttons are displayed. The following
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flags can be passed to this function:
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@code
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wxYES_NO // Add Yes/No subpanel
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wxYES // return wxID_YES
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wxNO // return wxID_NO
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wxNO_DEFAULT // make the wxNO button the default,
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// otherwise wxYES or wxOK button will be default
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wxOK // return wxID_OK
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wxCANCEL // return wxID_CANCEL
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wxHELP // return wxID_HELP
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wxFORWARD // return wxID_FORWARD
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wxBACKWARD // return wxID_BACKWARD
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wxSETUP // return wxID_SETUP
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wxMORE // return wxID_MORE
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@endcode
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*/
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