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NAME
wxSizer - Functions for wxSizer class
DESCRIPTION
wxSizer is the abstract base class used for laying out subwindows in a window. You cannot use wxSizer
directly; instead, you will have to use one of the sizer classes derived from it. Currently there are
wxBoxSizer, wxStaticBoxSizer, wxGridSizer, wxFlexGridSizer, wxWrapSizer (not implemented in wx) and
wxGridBagSizer.
The layout algorithm used by sizers in wxWidgets is closely related to layout in other GUI toolkits, such
as Java's AWT, the GTK toolkit or the Qt toolkit. It is based upon the idea of the individual subwindows
reporting their minimal required size and their ability to get stretched if the size of the parent window
has changed.
This will most often mean that the programmer does not set the original size of a dialog in the
beginning, rather the dialog will be assigned a sizer and this sizer will be queried about the
recommended size. The sizer in turn will query its children, which can be normal windows, empty space or
other sizers, so that a hierarchy of sizers can be constructed. Note that wxSizer does not derive from
wxWindow and thus does not interfere with tab ordering and requires very little resources compared to a
real window on screen.
What makes sizers so well fitted for use in wxWidgets is the fact that every control reports its own
minimal size and the algorithm can handle differences in font sizes or different window (dialog item)
sizes on different platforms without problems. If e.g. the standard font as well as the overall design of
Motif widgets requires more space than on Windows, the initial dialog size will automatically be bigger
on Motif than on Windows.
Sizers may also be used to control the layout of custom drawn items on the window. The add/4, insert/5,
and prepend/4 functions return a pointer to the newly added wxSizerItem. Just add empty space of the
desired size and attributes, and then use the wxSizerItem:getRect/1 method to determine where the drawing
operations should take place.
Please notice that sizers, like child windows, are owned by the library and will be deleted by it which
implies that they must be allocated on the heap. However if you create a sizer and do not add it to
another sizer or window, the library wouldn't be able to delete such an orphan sizer and in this, and
only this, case it should be deleted explicitly.
wxSizer flags
The "flag" argument accepted by wxSizerItem constructors and other functions, e.g. add/4, is an OR-
combination of the following flags. Two main behaviours are defined using these flags. One is the border
around a window: the border parameter determines the border width whereas the flags given here determine
which side(s) of the item that the border will be added. The other flags determine how the sizer item
behaves when the space allotted to the sizer changes, and is somewhat dependent on the specific kind of
sizer used.
See: Overview sizer
wxWidgets docs: wxSizer
DATA TYPES
wxSizer() = wx:wx_object()
EXPORTS
add(This, Window) -> wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
Window = wxWindow:wxWindow() | wxSizer:wxSizer()
add(This, Width, Height) -> wxSizerItem:wxSizerItem()
add(This, Window, Flags) -> wxSizerItem:wxSizerItem()
add(This, Window, Height :: [Option]) -> wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
Window = wxWindow:wxWindow() | wxSizer:wxSizer()
Option =
{proportion, integer()} |
{flag, integer()} |
{border, integer()} |
{userData, wx:wx_object()}
Appends a child to the sizer.
wxSizer itself is an abstract class, but the parameters are equivalent in the derived classes that
you will instantiate to use it so they are described here:
add(This, Width, Height, Options :: [Option]) ->
wxSizerItem:wxSizerItem()
add(This, Width, Height, Flags) -> wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
Width = Height = integer()
Flags = wxSizerFlags:wxSizerFlags()
Appends a spacer child to the sizer.
addSpacer(This, Size) -> wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
Size = integer()
This base function adds non-stretchable space to both the horizontal and vertical orientation of
the sizer.
More readable way of calling:
See: addSpacer/2
addStretchSpacer(This) -> wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
addStretchSpacer(This, Options :: [Option]) ->
wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
Option = {prop, integer()}
Adds stretchable space to the sizer.
More readable way of calling:
calcMin(This) -> {W :: integer(), H :: integer()}
Types:
This = wxSizer()
This method is abstract and has to be overwritten by any derived class.
Here, the sizer will do the actual calculation of its children's minimal sizes.
clear(This) -> ok
Types:
This = wxSizer()
clear(This, Options :: [Option]) -> ok
Types:
This = wxSizer()
Option = {delete_windows, boolean()}
Detaches all children from the sizer.
If delete_windows is true then child windows will also be deleted.
Notice that child sizers are always deleted, as a general consequence of the principle that sizers
own their sizer children, but don't own their window children (because they are already owned by
their parent windows).
detach(This, Window) -> boolean()
detach(This, Index) -> boolean()
Types:
This = wxSizer()
Index = integer()
Detach a item at position index from the sizer without destroying it.
This method does not cause any layout or resizing to take place, call layout/1 to update the
layout "on screen" after detaching a child from the sizer. Returns true if the child item was
found and detached, false otherwise.
See: remove/2
fit(This, Window) -> {W :: integer(), H :: integer()}
Types:
This = wxSizer()
Window = wxWindow:wxWindow()
Tell the sizer to resize the window so that its client area matches the sizer's minimal size
(ComputeFittingClientSize() (not implemented in wx) is called to determine it).
This is commonly done in the constructor of the window itself, see sample in the description of
wxBoxSizer.
Return: The new window size.
See: ComputeFittingClientSize() (not implemented in wx), ComputeFittingWindowSize() (not
implemented in wx)
setVirtualSizeHints(This, Window) -> ok
Types:
This = wxSizer()
Window = wxWindow:wxWindow()
See: fitInside/2.
fitInside(This, Window) -> ok
Types:
This = wxSizer()
Window = wxWindow:wxWindow()
Tell the sizer to resize the virtual size of the window to match the sizer's minimal size.
This will not alter the on screen size of the window, but may cause the
addition/removal/alteration of scrollbars required to view the virtual area in windows which
manage it.
See: wxScrolledWindow:setScrollbars/6, setVirtualSizeHints/2
getChildren(This) -> [wxSizerItem:wxSizerItem()]
Types:
This = wxSizer()
getItem(This, Window) -> wxSizerItem:wxSizerItem()
getItem(This, Index) -> wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
Index = integer()
Finds wxSizerItem which is located in the sizer at position index.
Use parameter recursive to search in subsizers too. Returns pointer to item or NULL.
getItem(This, Window, Options :: [Option]) ->
wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
Window = wxWindow:wxWindow() | wxSizer:wxSizer()
Option = {recursive, boolean()}
Finds wxSizerItem which holds the given window.
Use parameter recursive to search in subsizers too. Returns pointer to item or NULL.
getSize(This) -> {W :: integer(), H :: integer()}
Types:
This = wxSizer()
Returns the current size of the sizer.
getPosition(This) -> {X :: integer(), Y :: integer()}
Types:
This = wxSizer()
Returns the current position of the sizer.
getMinSize(This) -> {W :: integer(), H :: integer()}
Types:
This = wxSizer()
Returns the minimal size of the sizer.
This is either the combined minimal size of all the children and their borders or the minimal size
set by setMinSize/3, depending on which is bigger. Note that the returned value is client size,
not window size. In particular, if you use the value to set toplevel window's minimal or actual
size, use wxWindow::SetMinClientSize() (not implemented in wx) or wxWindow:setClientSize/3, not
wxWindow:setMinSize/2 or wxWindow:setSize/6.
hide(This, Window) -> boolean()
hide(This, Index) -> boolean()
Types:
This = wxSizer()
Index = integer()
Hides the item at position index.
To make a sizer item disappear, use hide/3 followed by layout/1.
Use parameter recursive to hide elements found in subsizers. Returns true if the child item was
found, false otherwise.
See: isShown/2, show/3
hide(This, Window, Options :: [Option]) -> boolean()
Types:
This = wxSizer()
Window = wxWindow:wxWindow() | wxSizer:wxSizer()
Option = {recursive, boolean()}
Hides the child window.
To make a sizer item disappear, use hide/3 followed by layout/1.
Use parameter recursive to hide elements found in subsizers. Returns true if the child item was
found, false otherwise.
See: isShown/2, show/3
insert(This, Index, Item) -> wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
Index = integer()
Item = wxSizerItem:wxSizerItem()
insert(This, Index, Width, Height) -> wxSizerItem:wxSizerItem()
insert(This, Index, Window, Flags) -> wxSizerItem:wxSizerItem()
insert(This, Index, Window, Height :: [Option]) ->
wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
Index = integer()
Window = wxWindow:wxWindow() | wxSizer:wxSizer()
Option =
{proportion, integer()} |
{flag, integer()} |
{border, integer()} |
{userData, wx:wx_object()}
Insert a child into the sizer before any existing item at index.
See add/4 for the meaning of the other parameters.
insert(This, Index, Width, Height, Options :: [Option]) ->
wxSizerItem:wxSizerItem()
insert(This, Index, Width, Height, Flags) ->
wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
Index = Width = Height = integer()
Flags = wxSizerFlags:wxSizerFlags()
Insert a child into the sizer before any existing item at index.
See add/4 for the meaning of the other parameters.
insertSpacer(This, Index, Size) -> wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
Index = Size = integer()
Inserts non-stretchable space to the sizer.
More readable way of calling wxSizer::Insert(index, size, size).
insertStretchSpacer(This, Index) -> wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
Index = integer()
insertStretchSpacer(This, Index, Options :: [Option]) ->
wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
Index = integer()
Option = {prop, integer()}
Inserts stretchable space to the sizer.
More readable way of calling wxSizer::Insert(0, 0, prop).
isShown(This, Window) -> boolean()
isShown(This, Index) -> boolean()
Types:
This = wxSizer()
Index = integer()
Returns true if the item at index is shown.
See: hide/3, show/3, wxSizerItem:isShown/1
recalcSizes(This) -> ok
Types:
This = wxSizer()
See: layout/1.
layout(This) -> ok
Types:
This = wxSizer()
Call this to force layout of the children anew, e.g. after having added a child to or removed a
child (window, other sizer or space) from the sizer while keeping the current dimension.
prepend(This, Item) -> wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
Item = wxSizerItem:wxSizerItem()
prepend(This, Width, Height) -> wxSizerItem:wxSizerItem()
prepend(This, Window, Flags) -> wxSizerItem:wxSizerItem()
prepend(This, Window, Height :: [Option]) ->
wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
Window = wxWindow:wxWindow() | wxSizer:wxSizer()
Option =
{proportion, integer()} |
{flag, integer()} |
{border, integer()} |
{userData, wx:wx_object()}
Same as add/4, but prepends the items to the beginning of the list of items (windows, subsizers or
spaces) owned by this sizer.
prepend(This, Width, Height, Options :: [Option]) ->
wxSizerItem:wxSizerItem()
prepend(This, Width, Height, Flags) -> wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
Width = Height = integer()
Flags = wxSizerFlags:wxSizerFlags()
Same as add/4, but prepends the items to the beginning of the list of items (windows, subsizers or
spaces) owned by this sizer.
prependSpacer(This, Size) -> wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
Size = integer()
Prepends non-stretchable space to the sizer.
More readable way of calling wxSizer::Prepend(size, size, 0).
prependStretchSpacer(This) -> wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
prependStretchSpacer(This, Options :: [Option]) ->
wxSizerItem:wxSizerItem()
Types:
This = wxSizer()
Option = {prop, integer()}
Prepends stretchable space to the sizer.
More readable way of calling wxSizer::Prepend(0, 0, prop).
remove(This, Index) -> boolean()
remove(This, Sizer) -> boolean()
Types:
This = Sizer = wxSizer()
Removes a sizer child from the sizer and destroys it.
Note: This method does not cause any layout or resizing to take place, call layout/1 to update the
layout "on screen" after removing a child from the sizer.
Return: true if the child item was found and removed, false otherwise.
replace(This, Oldwin, Newwin) -> boolean()
replace(This, Index, Newitem) -> boolean()
Types:
This = wxSizer()
Index = integer()
Newitem = wxSizerItem:wxSizerItem()
Detaches the given item at position index from the sizer and replaces it with the given
wxSizerItem newitem.
The detached child is deleted only if it is a sizer or a spacer (but not if it is a wxWindow
because windows are owned by their parent window, not the sizer).
This method does not cause any layout or resizing to take place, call layout/1 to update the
layout "on screen" after replacing a child from the sizer.
Returns true if the child item was found and removed, false otherwise.
replace(This, Oldwin, Newwin, Options :: [Option]) -> boolean()
Types:
This = wxSizer()
Oldwin = Newwin = wxWindow:wxWindow() | wxSizer:wxSizer()
Option = {recursive, boolean()}
Detaches the given oldwin from the sizer and replaces it with the given newwin.
The detached child window is not deleted (because windows are owned by their parent window, not
the sizer).
Use parameter recursive to search the given element recursively in subsizers.
This method does not cause any layout or resizing to take place, call layout/1 to update the
layout "on screen" after replacing a child from the sizer.
Returns true if the child item was found and removed, false otherwise.
setDimension(This, Pos, Size) -> ok
Types:
This = wxSizer()
Pos = {X :: integer(), Y :: integer()}
Size = {W :: integer(), H :: integer()}
This is an overloaded member function, provided for convenience. It differs from the above
function only in what argument(s) it accepts.
setDimension(This, X, Y, Width, Height) -> ok
Types:
This = wxSizer()
X = Y = Width = Height = integer()
Call this to force the sizer to take the given dimension and thus force the items owned by the
sizer to resize themselves according to the rules defined by the parameter in the add/4 and
prepend/4 methods.
setMinSize(This, Size) -> ok
Types:
This = wxSizer()
Size = {W :: integer(), H :: integer()}
Call this to give the sizer a minimal size.
Normally, the sizer will calculate its minimal size based purely on how much space its children
need. After calling this method getMinSize/1 will return either the minimal size as requested by
its children or the minimal size set here, depending on which is bigger.
setMinSize(This, Width, Height) -> ok
Types:
This = wxSizer()
Width = Height = integer()
This is an overloaded member function, provided for convenience. It differs from the above
function only in what argument(s) it accepts.
setItemMinSize(This, Window, Size) -> boolean()
setItemMinSize(This, Index, Size) -> boolean()
Types:
This = wxSizer()
Index = integer()
Size = {W :: integer(), H :: integer()}
setItemMinSize(This, Window, Width, Height) -> boolean()
setItemMinSize(This, Index, Width, Height) -> boolean()
Types:
This = wxSizer()
Index = Width = Height = integer()
setSizeHints(This, Window) -> ok
Types:
This = wxSizer()
Window = wxWindow:wxWindow()
This method first calls fit/2 and then setSizeHints/2 on the window passed to it.
This only makes sense when window is actually a wxTopLevelWindow such as a wxFrame or a wxDialog,
since SetSizeHints only has any effect in these classes. It does nothing in normal windows or
controls.
This method is implicitly used by wxWindow:setSizerAndFit/3 which is commonly invoked in the
constructor of a toplevel window itself (see the sample in the description of wxBoxSizer) if the
toplevel window is resizable.
show(This, Window) -> boolean()
show(This, Index) -> boolean()
show(This, Show) -> ok
Types:
This = wxSizer()
Show = boolean()
show(This, Window, Options :: [Option]) -> boolean()
show(This, Index, Options :: [Option]) -> boolean()
Types:
This = wxSizer()
Index = integer()
Option = {show, boolean()}
Shows the item at index.
To make a sizer item disappear or reappear, use show/3 followed by layout/1.
Returns true if the child item was found, false otherwise.
See: hide/3, isShown/2
showItems(This, Show) -> ok
Types:
This = wxSizer()
Show = boolean()
Show or hide all items managed by the sizer.