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VKeyboard

_images/vkeyboard.jpg

New in version 1.0.8.

VKeyboard is an onscreen keyboard for Kivy. Its operation is intended to be transparent to the user. Using the widget directly is NOT recommended. Read the section Request keyboard first.

Modes

This virtual keyboard has a docked and free mode:

  • docked mode (VKeyboard.docked = True) Generally used when only one person is using the computer, like a tablet or personal computer etc.
  • free mode: (VKeyboard.docked = False) Mostly for multitouch surfaces. This mode allows multiple virtual keyboards to be used on the screen.

If the docked mode changes, you need to manually call VKeyboard.setup_mode() otherwise the change will have no impact. During that call, the VKeyboard, implemented on top of a Scatter, will change the behavior of the scatter and position the keyboard near the target (if target and docked mode is set).

Layouts

The virtual keyboard is able to load a custom layout. If you create a new layout and put the JSON in <kivy_data_dir>/keyboards/<layoutid>.json, you can load it by setting VKeyboard.layout to your layoutid.

The JSON must be structured like this:

{
    "title": "Title of your layout",
    "description": "Description of your layout",
    "cols": 15,
    "rows": 5,

    ...
}

Then, you need to describe the keys in each row, for either a “normal”, “shift” or a “special” (added in version 1.9.0) mode. Keys for this row data must be named normal_<row>, shift_<row> and special_<row>. Replace row with the row number. Inside each row, you will describe the key. A key is a 4 element list in the format:

[ <text displayed on the keyboard>, <text to put when the key is pressed>,
  <text that represents the keycode>, <size of cols> ]

Here are example keys:

# f key
["f", "f", "f", 1]
# capslock
["↹", "     ", "tab", 1.5]

Finally, complete the JSON:

{
    ...
    "normal_1": [
        ["`", "`", "`", 1],    ["1", "1", "1", 1],    ["2", "2", "2", 1],
        ["3", "3", "3", 1],    ["4", "4", "4", 1],    ["5", "5", "5", 1],
        ["6", "6", "6", 1],    ["7", "7", "7", 1],    ["8", "8", "8", 1],
        ["9", "9", "9", 1],    ["0", "0", "0", 1],    ["+", "+", "+", 1],
        ["=", "=", "=", 1],    ["⌫", null, "backspace", 2]
    ],

    "shift_1": [ ... ],
    "normal_2": [ ... ],
    "special_2": [ ... ],
    ...
}

Request Keyboard

The instantiation of the virtual keyboard is controlled by the configuration. Check keyboard_mode and keyboard_layout in the Configuration object.

If you intend to create a widget that requires a keyboard, do not use the virtual keyboard directly, but prefer to use the best method available on the platform. Check the request_keyboard() method in the Window.

If you want a specific layout when you request the keyboard, you should write something like this (from 1.8.0, numeric.json can be in the same directory as your main.py):

keyboard = Window.request_keyboard(
    self._keyboard_close, self)
if keyboard.widget:
    vkeyboard = self._keyboard.widget
    vkeyboard.layout = 'numeric.json'
class kivy.uix.vkeyboard.VKeyboard(**kwargs)[source]

Bases: kivy.uix.scatter.Scatter

VKeyboard is an onscreen keyboard with multitouch support. Its layout is entirely customizable and you can switch between available layouts using a button in the bottom right of the widget.

Events:
on_key_down: keycode, internal, modifiers

Fired when the keyboard received a key down event (key press).

on_key_up: keycode, internal, modifiers

Fired when the keyboard received a key up event (key release).

available_layouts

Dictionary of all available layouts. Keys are the layout ID, and the value is the JSON (translated into a Python object).

available_layouts is a DictProperty and defaults to {}.

background

Filename of the background image.

background is a StringProperty and defaults to atlas://data/images/defaulttheme/vkeyboard_background.

background_border

Background image border. Used for controlling the border property of the background.

background_border is a ListProperty and defaults to [16, 16, 16, 16]

background_color

Background color, in the format (r, g, b, a). If a background is set, the color will be combined with the background texture.

background_color is a ListProperty and defaults to [1, 1, 1, 1].

background_disabled

Filename of the background image when the vkeyboard is disabled.

New in version 1.8.0.

background_disabled is a StringProperty and defaults to atlas://data/images/defaulttheme/vkeyboard__disabled_background.

callback

Callback can be set to a function that will be called if the VKeyboard is closed by the user.

target is an ObjectProperty instance and defaults to None.

collide_margin(x, y)[source]

Do a collision test, and return True if the (x, y) is inside the vkeyboard margin.

docked

Indicate whether the VKeyboard is docked on the screen or not. If you change it, you must manually call setup_mode() otherwise it will have no impact. If the VKeyboard is created by the Window, the docked mode will be automatically set by the configuration, using the keyboard_mode token in [kivy] section.

docked is a BooleanProperty and defaults to False.

font_size

font_size, specifies the size of the text on the virtual keyboard keys. It should be kept within limits to ensure the text does not extend beyond the bounds of the key or become too small to read.

New in version 1.10.0.

font_size is a NumericProperty and defaults to 20.

key_background_color

Key background color, in the format (r, g, b, a). If a key background is set, the color will be combined with the key background texture.

key_background_color is a ListProperty and defaults to [1, 1, 1, 1].

key_background_down

Filename of the key background image for use when a touch is active on the widget.

key_background_down is a StringProperty and defaults to atlas://data/images/defaulttheme/vkeyboard_key_down.

key_background_normal

Filename of the key background image for use when no touches are active on the widget.

key_background_normal is a StringProperty and defaults to atlas://data/images/defaulttheme/vkeyboard_key_normal.

key_border

Key image border. Used for controlling the border property of the key.

key_border is a ListProperty and defaults to [16, 16, 16, 16]

key_disabled_background_normal

Filename of the key background image for use when no touches are active on the widget and vkeyboard is disabled.

New in version 1.8.0.

key_disabled_background_normal is a StringProperty and defaults to atlas://data/images/defaulttheme/vkeyboard_disabled_key_normal.

key_margin

Key margin, used to create space between keys. The margin is composed of four values, in pixels:

key_margin = [top, right, bottom, left]

key_margin is a ListProperty and defaults to [2, 2, 2, 2]

layout

Layout to use for the VKeyboard. By default, it will be the layout set in the configuration, according to the keyboard_layout in [kivy] section.

Changed in version 1.8.0: If layout is a .json filename, it will loaded and added to the available_layouts.

layout is a StringProperty and defaults to None.

layout_path

Path from which layouts are read.

layout is a StringProperty and defaults to <kivy_data_dir>/keyboards/

margin_hint

Margin hint, used as spacing between keyboard background and keys content. The margin is composed of four values, between 0 and 1:

margin_hint = [top, right, bottom, left]

The margin hints will be multiplied by width and height, according to their position.

margin_hint is a ListProperty and defaults to [.05, .06, .05, .06]

refresh(force=False)[source]

(internal) Recreate the entire widget and graphics according to the selected layout.

setup_mode(*largs)[source]

Call this method when you want to readjust the keyboard according to options: docked or not, with attached target or not:

Feel free to overload these methods to create new positioning behavior.

setup_mode_dock(*largs)[source]

Setup the keyboard in docked mode.

Dock mode will reset the rotation, disable translation, rotation and scale. Scale and position will be automatically adjusted to attach the keyboard to the bottom of the screen.

Note

Don’t call this method directly, use setup_mode() instead.

setup_mode_free()[source]

Setup the keyboard in free mode.

Free mode is designed to let the user control the position and orientation of the keyboard. The only real usage is for a multiuser environment, but you might found other ways to use it. If a target is set, it will place the vkeyboard under the target.

Note

Don’t call this method directly, use setup_mode() instead.

target

Target widget associated with the VKeyboard. If set, it will be used to send keyboard events. If the VKeyboard mode is “free”, it will also be used to set the initial position.

target is an ObjectProperty instance and defaults to None.