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NAME
wxButton - Functions for wxButton class
DESCRIPTION
A button is a control that contains a text string, and is one of the most common elements
of a GUI.
It may be placed on a wxDialog or on a wxPanel panel, or indeed on almost any other
window.
By default, i.e. if none of the alignment styles are specified, the label is centered both
horizontally and vertically. If the button has both a label and a bitmap, the alignment
styles above specify the location of the rectangle combining both the label and the bitmap
and the bitmap position set with wxButton::SetBitmapPosition() (not implemented in wx)
defines the relative position of the bitmap with respect to the label (however currently
non-default alignment combinations are not implemented on all platforms).
Since version 2.9.1 wxButton supports showing both text and an image (currently only when
using wxMSW, wxGTK or wxOSX/Cocoa ports), see SetBitmap() (not implemented in wx) and
setBitmapLabel/2, setBitmapDisabled/2 &c methods. In the previous wxWidgets versions this
functionality was only available in (the now trivial) wxBitmapButton class which was only
capable of showing an image without text.
A button may have either a single image for all states or different images for the
following states (different images are not currently supported under macOS where the
normal image is used for all states):
All of the bitmaps must be of the same size and the normal bitmap must be set first (to a
valid bitmap), before setting any other ones. Also, if the size of the bitmaps is changed
later, you need to change the size of the normal bitmap before setting any other bitmaps
with the new size (and you do need to reset all of them as their original values can be
lost when the normal bitmap size changes).
The position of the image inside the button be configured using SetBitmapPosition() (not
implemented in wx). By default the image is on the left of the text.
Please also notice that GTK+ uses a global setting called gtk-button-images to determine
if the images should be shown in the buttons at all. If it is off (which is the case in
e.g. Gnome 2.28 by default), no images will be shown, consistently with the native
behaviour.
Styles
This class supports the following styles:
See: wxBitmapButton
This class is derived (and can use functions) from: wxControl wxWindow wxEvtHandler
wxWidgets docs: wxButton
EVENTS
Event types emitted from this class: command_button_clicked
DATA TYPES
wxButton() = wx:wx_object()
EXPORTS
new() -> wxButton()
Default ctor.
new(Parent, Id) -> wxButton()
Types:
Parent = wxWindow:wxWindow()
Id = integer()
new(Parent, Id, Options :: [Option]) -> wxButton()
Types:
Parent = wxWindow:wxWindow()
Id = integer()
Option =
{label, unicode:chardata()} |
{pos, {X :: integer(), Y :: integer()}} |
{size, {W :: integer(), H :: integer()}} |
{style, integer()} |
{validator, wx:wx_object()}
Constructor, creating and showing a button.
The preferred way to create standard buttons is to use default value of label. If
no label is supplied and id is one of standard IDs from this list, a standard label
will be used. In other words, if you use a predefined wxID_XXX constant, just omit
the label completely rather than specifying it. In particular, help buttons (the
ones with id of wxID_HELP) under macOS can't display any label at all and while
wxButton will detect if the standard "Help" label is used and ignore it, using any
other label will prevent the button from correctly appearing as a help button and
so should be avoided.
In addition to that, the button will be decorated with stock icons under GTK+ 2.
See: create/4, wxValidator (not implemented in wx)
create(This, Parent, Id) -> boolean()
Types:
This = wxButton()
Parent = wxWindow:wxWindow()
Id = integer()
create(This, Parent, Id, Options :: [Option]) -> boolean()
Types:
This = wxButton()
Parent = wxWindow:wxWindow()
Id = integer()
Option =
{label, unicode:chardata()} |
{pos, {X :: integer(), Y :: integer()}} |
{size, {W :: integer(), H :: integer()}} |
{style, integer()} |
{validator, wx:wx_object()}
Button creation function for two-step creation.
For more details, see new/3.
getDefaultSize() -> {W :: integer(), H :: integer()}
Returns the default size for the buttons.
It is advised to make all the dialog buttons of the same size and this function
allows retrieving the (platform, and current font dependent) size which should be
the best suited for this.
The optional win argument is new since wxWidgets 3.1.3 and allows to get a per-
monitor DPI specific size.
getDefaultSize(Win) -> {W :: integer(), H :: integer()}
Types:
Win = wxWindow:wxWindow()
setDefault(This) -> wxWindow:wxWindow()
Types:
This = wxButton()
This sets the button to be the default item in its top-level window (e.g.
the panel or the dialog box containing it).
As normal, pressing return causes the default button to be depressed when the
return key is pressed.
See also wxWindow:setFocus/1 which sets the keyboard focus for windows and text
panel items, and wxTopLevelWindow::SetDefaultItem() (not implemented in wx).
Remark: Under Windows, only dialog box buttons respond to this function.
Return: the old default item (possibly NULL)
setLabel(This, Label) -> ok
Types:
This = wxButton()
Label = unicode:chardata()
Sets the string label for the button.
getBitmapDisabled(This) -> wxBitmap:wxBitmap()
Types:
This = wxButton()
Returns the bitmap for the disabled state, which may be invalid.
See: setBitmapDisabled/2
Since: 2.9.1 (available in wxBitmapButton only in previous versions)
getBitmapFocus(This) -> wxBitmap:wxBitmap()
Types:
This = wxButton()
Returns the bitmap for the focused state, which may be invalid.
See: setBitmapFocus/2
Since: 2.9.1 (available in wxBitmapButton only in previous versions)
getBitmapLabel(This) -> wxBitmap:wxBitmap()
Types:
This = wxButton()
Returns the bitmap for the normal state.
This is exactly the same as GetBitmap() (not implemented in wx) but uses a name
backwards-compatible with wxBitmapButton.
See: SetBitmap() (not implemented in wx), setBitmapLabel/2
Since: 2.9.1 (available in wxBitmapButton only in previous versions)
setBitmapDisabled(This, Bitmap) -> ok
Types:
This = wxButton()
Bitmap = wxBitmap:wxBitmap()
Sets the bitmap for the disabled button appearance.
If bitmap is invalid, the disabled bitmap is set to the automatically generated
greyed out version of the normal bitmap, i.e. the same bitmap as is used by default
if this method is not called at all. Use SetBitmap() (not implemented in wx) with
an invalid bitmap to remove the bitmap completely (for all states).
See: getBitmapDisabled/1, setBitmapLabel/2, SetBitmapPressed() (not implemented in
wx), setBitmapFocus/2
Since: 2.9.1 (available in wxBitmapButton only in previous versions)
setBitmapFocus(This, Bitmap) -> ok
Types:
This = wxButton()
Bitmap = wxBitmap:wxBitmap()
Sets the bitmap for the button appearance when it has the keyboard focus.
If bitmap is invalid, the normal bitmap will be used in the focused state.
See: getBitmapFocus/1, setBitmapLabel/2, SetBitmapPressed() (not implemented in
wx), setBitmapDisabled/2
Since: 2.9.1 (available in wxBitmapButton only in previous versions)
setBitmapLabel(This, Bitmap) -> ok
Types:
This = wxButton()
Bitmap = wxBitmap:wxBitmap()
Sets the bitmap label for the button.
Remark: This is the bitmap used for the unselected state, and for all other states
if no other bitmaps are provided.
See: SetBitmap() (not implemented in wx), getBitmapLabel/1
Since: 2.9.1 (available in wxBitmapButton only in previous versions)
destroy(This :: wxButton()) -> ok
Destroys the object.