[PATCH wayland-protocols v5] text: Create second version of text input protocol
Jan Arne Petersen
janarne at gmail.com
Wed Mar 23 20:14:09 UTC 2016
There is a reference implementation of this version of the protocol in
QtWayland https://codereview.qt-project.org/#/c/153711/ where the
text-input protocol is used to proxy the Qt input method of Qt Wayland
clients to the Qt input method on compositor side.
One can then use for example the qtvirtualkeyboard (which plugs in the Qt
input method system) in the Qt compositor and use that to input text in all
clients.
Jan Arne Petersen
On Mon, Mar 14, 2016 at 12:58 PM Jan Arne Petersen <janarne at gmail.com>
wrote:
> There were some shortcomings in the first version of the protocol which
> makes it not really useful in real world applications. It is not really
> possible to fix them in a compatible way so introduce a new v2 of the
> protocol.
>
> Fixes some shortcomings of the first version:
>
> * Use only one wp_text_input per wl_seat (client side should be
> handled by client toolkit)
> * Allow focus tracking without wl_keyboard present
> * Improve update state handling and better define state handling
>
> Signed-off-by: Jan Arne Petersen <janarne at gmail.com>
> ---
> Chnages to v4:
> * Improved descriptions
> * Remove invoke_action request
>
> unstable/text-input/text-input-unstable-v2.xml | 484
> +++++++++++++++++++++++++
> 1 file changed, 484 insertions(+)
> create mode 100644 unstable/text-input/text-input-unstable-v2.xml
>
> diff --git a/unstable/text-input/text-input-unstable-v2.xml
> b/unstable/text-input/text-input-unstable-v2.xml
> new file mode 100644
> index 0000000..1e64c4b
> --- /dev/null
> +++ b/unstable/text-input/text-input-unstable-v2.xml
> @@ -0,0 +1,484 @@
> +<?xml version="1.0" encoding="UTF-8"?>
> +
> +<protocol name="text_input_unstable_v2">
> + <copyright>
> + Copyright © 2012, 2013 Intel Corporation
> + Copyright © 2015, 2016 Jan Arne Petersen
> +
> + Permission to use, copy, modify, distribute, and sell this
> + software and its documentation for any purpose is hereby granted
> + without fee, provided that the above copyright notice appear in
> + all copies and that both that copyright notice and this permission
> + notice appear in supporting documentation, and that the name of
> + the copyright holders not be used in advertising or publicity
> + pertaining to distribution of the software without specific,
> + written prior permission. The copyright holders make no
> + representations about the suitability of this software for any
> + purpose. It is provided "as is" without express or implied
> + warranty.
> +
> + THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
> + SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
> + FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
> + SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
> + WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
> + AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
> + ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
> + THIS SOFTWARE.
> + </copyright>
> +
> + <interface name="zwp_text_input_v2" version="1">
> + <description summary="text input">
> + The zwp_text_input_v2 interface represents text input and input
> methods
> + associated with a seat. It provides enter/leave events to follow the
> + text input focus for a seat.
> +
> + Requests are used to enable/disable the text-input object and set
> + state information like surrounding and selected text or the content
> type.
> + The information about the entered text is sent to the text-input
> object
> + via the pre-edit and commit events. Using this interface removes
> the need
> + for applications to directly process hardware key events and
> compose text
> + out of them.
> +
> + Text is valid UTF-8 encoded, indices and lengths are in bytes.
> Indices
> + have to always point to the first byte of an UTF-8 encoded code
> point.
> + Lengths are not allowed to contain just a part of an UTF-8 encoded
> code
> + point.
> +
> + State is sent by the state requests (set_surrounding_text,
> + set_content_type, set_cursor_rectangle and set_preferred_language)
> and
> + an update_state request. After an enter or an input_method_change
> event
> + all state information is invalidated and needs to be resent from the
> + client. A reset or entering a new widget on client side also
> + invalidates all current state information.
> +
> + Serials are used to synchronize the state between the client and
> + an input method. New serials are sent by the text input in the
> + update_state request and are used by the input method to indicate
> + the known text input state in events like preedit_string,
> commit_string,
> + and keysym. The text input can then ignore events from the input
> method
> + which are based on an outdated state (for example after a reset).
> + </description>
> +
> + <request name="destroy" type="destructor">
> + <description summary="Destroy the wp_text_input">
> + Destroy the wp_text_input object. Also disables all surfaces
> enabled
> + through this wp_text_input object
> + </description>
> + </request>
> +
> + <request name="enable">
> + <description summary="enable text input for surface">
> + Enable text input in a surface (usually when a text entry inside
> of it
> + has focus).
> +
> + This can be called before or after a surface gets text (or
> keyboard)
> + focus via the enter event. Text input to a surface is only active
> + when it has the current text (or keyboard) focus and is enabled.
> + </description>
> + <arg name="surface" type="object" interface="wl_surface"/>
> + </request>
> +
> + <request name="disable">
> + <description summary="disable text input for surface">
> + Disable text input in a surface (typically when there is no focus
> on any
> + text entry inside the surface).
> + </description>
> + <arg name="surface" type="object" interface="wl_surface"/>
> + </request>
> +
> + <request name="show_input_panel">
> + <description summary="show input panels">
> + Requests input panels (virtual keyboard) to show.
> +
> + This should be used for example to show a virtual keyboard again
> + (with a tap) after it was closed by pressing on a close button on
> the
> + keyboard.
> + </description>
> + </request>
> +
> + <request name="hide_input_panel">
> + <description summary="hide input panels">
> + Requests input panels (virtual keyboard) to hide.
> + </description>
> + </request>
> +
> + <request name="set_surrounding_text">
> + <description summary="sets the surrounding text">
> + Sets the plain surrounding text around the input position. Text is
> + UTF-8 encoded. Cursor is the byte offset within the surrounding
> text.
> + Anchor is the byte offset of the selection anchor within the
> + surrounding text. If there is no selected text, anchor is the same
> as
> + cursor.
> +
> + Make sure to always send some text before and after the cursor
> + except when the cursor is at the beginning or end of text.
> +
> + When there was a configure_surrounding_text event take the
> + before_cursor and after_cursor arguments into account for picking
> how
> + much surrounding text to send.
> +
> + There is a maximum length of wayland messages so text can not be
> + longer than 4000 bytes.
> + </description>
> + <arg name="text" type="string"/>
> + <arg name="cursor" type="int"/>
> + <arg name="anchor" type="int"/>
> + </request>
> +
> + <enum name="content_hint" bitfield="true">
> + <description summary="content hint">
> + Content hint is a bitmask to allow to modify the behavior of the
> text
> + input.
> + </description>
> + <entry name="none" value="0x0" summary="no special behaviour"/>
> + <entry name="auto_completion" value="0x1" summary="suggest word
> completions"/>
> + <entry name="auto_correction" value="0x2" summary="suggest word
> corrections"/>
> + <entry name="auto_capitalization" value="0x4" summary="switch to
> uppercase letters at the start of a sentence"/>
> + <entry name="lowercase" value="0x8" summary="prefer lowercase
> letters"/>
> + <entry name="uppercase" value="0x10" summary="prefer uppercase
> letters"/>
> + <entry name="titlecase" value="0x20" summary="prefer casing for
> titles and headings (can be language dependent)"/>
> + <entry name="hidden_text" value="0x40" summary="characters should
> be hidden"/>
> + <entry name="sensitive_data" value="0x80" summary="typed text
> should not be stored"/>
> + <entry name="latin" value="0x100" summary="just latin characters
> should be entered"/>
> + <entry name="multiline" value="0x200" summary="the text input is
> multiline"/>
> + </enum>
> +
> + <enum name="content_purpose">
> + <description summary="content purpose">
> + The content purpose allows to specify the primary purpose of a text
> + input.
> +
> + This allows an input method to show special purpose input panels
> with
> + extra characters or to disallow some characters.
> + </description>
> + <entry name="normal" value="0" summary="default input, allowing all
> characters"/>
> + <entry name="alpha" value="1" summary="allow only alphabetic
> characters"/>
> + <entry name="digits" value="2" summary="allow only digits"/>
> + <entry name="number" value="3" summary="input a number (including
> decimal separator and sign)"/>
> + <entry name="phone" value="4" summary="input a phone number"/>
> + <entry name="url" value="5" summary="input an URL"/>
> + <entry name="email" value="6" summary="input an email address"/>
> + <entry name="name" value="7" summary="input a name of a person"/>
> + <entry name="password" value="8" summary="input a password (combine
> with password or sensitive_data hint)"/>
> + <entry name="date" value="9" summary="input a date"/>
> + <entry name="time" value="10" summary="input a time"/>
> + <entry name="datetime" value="11" summary="input a date and time"/>
> + <entry name="terminal" value="12" summary="input for a terminal"/>
> + </enum>
> +
> + <request name="set_content_type">
> + <description summary="set content purpose and hint">
> + Sets the content purpose and content hint. While the purpose is the
> + basic purpose of an input field, the hint flags allow to modify
> some
> + of the behavior.
> +
> + When no content type is explicitly set, a normal content purpose
> with
> + none hint should be assumed.
> + </description>
> + <arg name="hint" type="uint" enum="content_hint"/>
> + <arg name="purpose" type="uint" enum="content_purpose"/>
> + </request>
> +
> + <request name="set_cursor_rectangle">
> + <description summary="set cursor position">
> + Sets the cursor outline as a x, y, width, height rectangle in
> surface
> + local coordinates.
> +
> + Allows the compositor to put a window with word suggestions near
> the
> + cursor.
> + </description>
> + <arg name="x" type="int"/>
> + <arg name="y" type="int"/>
> + <arg name="width" type="int"/>
> + <arg name="height" type="int"/>
> + </request>
> +
> + <request name="set_preferred_language">
> + <description summary="sets preferred language">
> + Sets a specific language. This allows for example a virtual
> keyboard to
> + show a language specific layout. The "language" argument is a
> RFC-3066
> + format language tag.
> +
> + It could be used for example in a word processor to indicate
> language of
> + currently edited document or in an instant message application
> which
> + tracks languages of contacts.
> + </description>
> + <arg name="language" type="string"/>
> + </request>
> +
> + <enum name="update_state">
> + <description summary="update_state flags">
> + Defines the reason for sending an updated state.
> + </description>
> + <entry name="change" value="0" summary="updated state because it
> changed"/>
> + <entry name="full" value="1" summary="full state after enter or
> input_method_changed event"/>
> + <entry name="reset" value="2" summary="full state after reset"/>
> + <entry name="enter" value="3" summary="full state after switching
> focus to a different widget on client side"/>
> + </enum>
> +
> + <request name="update_state">
> + <description summary="update state">
> + Allows to atomically send state updates from client.
> +
> + This request should follow after a batch of state updating requests
> + like set_surrounding_text, set_content_type, set_cursor_rectangle
> and
> + set_preferred_language.
> +
> + The flags field indicates why an updated state is sent to the input
> + method.
> +
> + Reset should be used by an editor widget after the text was changed
> + outside of the normal input method flow.
> +
> + For "change" it is enough to send the changed state, else the full
> + state should be send.
> + </description>
> + <arg name="serial" type="uint" summary="used to identify the known
> state"/>
> + <arg name="flags" type="uint" enum="update_state"/>
> + </request>
> +
> + <event name="enter">
> + <description summary="enter event">
> + Notification that this seat's text-input focus is on a certain
> surface.
> +
> + When the seat has the keyboard capability the text-input focus
> follows
> + the keyboard focus.
> + </description>
> + <arg name="serial" type="uint"/>
> + <arg name="surface" type="object" interface="wl_surface"/>
> + </event>
> +
> + <event name="leave">
> + <description summary="leave event">
> + Notification that this seat's text-input focus is no longer on
> + a certain surface.
> +
> + The leave notification is sent before the enter notification
> + for the new focus.
> +
> + When the seat has the keyboard capabillity the text-input focus
> follows
> + the keyboard focus.
> + </description>
> + <arg name="serial" type="uint"/>
> + <arg name="surface" type="object" interface="wl_surface"/>
> + </event>
> +
> + <enum name="input_panel_visibility">
> + <entry name="hidden" value="0"
> + summary="the input panel (virtual keyboard) is hidden"/>
> + <entry name="visible" value="1"
> + summary="the input panel (virtual keyboard) is visible"/>
> + </enum>
> +
> + <event name="input_panel_state">
> + <description summary="state of the input panel">
> + Notification that the visibility of the input panel (virtual
> keyboard)
> + changed.
> +
> + The rectangle x, y, width, height defines the area overlapped by
> the
> + input panel (virtual keyboard) on the surface having the text
> + focus in surface local coordinates.
> +
> + That can be used to make sure widgets are visible and not covered
> by
> + a virtual keyboard.
> + </description>
> + <arg name="state" type="uint" enum="input_panel_visibility"/>
> + <arg name="x" type="int"/>
> + <arg name="y" type="int"/>
> + <arg name="width" type="int"/>
> + <arg name="height" type="int"/>
> + </event>
> +
> + <event name="preedit_string">
> + <description summary="pre-edit">
> + Notify when a new composing text (pre-edit) should be set around
> the
> + current cursor position. Any previously set composing text should
> + be removed.
> +
> + The commit text can be used to replace the composing text in some
> cases
> + (for example when losing focus).
> +
> + The text input should also handle all preedit_style and
> preedit_cursor
> + events occurring directly before preedit_string.
> + </description>
> + <arg name="serial" type="uint" summary="serial of the latest known
> text input state"/>
> + <arg name="text" type="string"/>
> + <arg name="commit" type="string"/>
> + </event>
> +
> + <enum name="preedit_style">
> + <entry name="default" value="0" summary="default style for
> composing text"/>
> + <entry name="none" value="1" summary="composing text should be
> shown the same as non-composing text"/>
> + <entry name="active" value="2" summary="composing text might be
> bold"/>
> + <entry name="inactive" value="3" summary="composing text might be
> cursive"/>
> + <entry name="highlight" value="4" summary="composing text might
> have a different background color"/>
> + <entry name="underline" value="5" summary="composing text might be
> underlined"/>
> + <entry name="selection" value="6" summary="composing text should be
> shown the same as selected text"/>
> + <entry name="incorrect" value="7" summary="composing text might be
> underlined with a red wavy line"/>
> + </enum>
> +
> + <event name="preedit_styling">
> + <description summary="pre-edit styling">
> + Sets styling information on composing text. The style is applied
> for
> + length bytes from index relative to the beginning of the composing
> + text (as byte offset). Multiple styles can be applied to a
> composing
> + text by sending multiple preedit_styling events.
> +
> + This event is handled as part of a following preedit_string event.
> + </description>
> + <arg name="index" type="uint"/>
> + <arg name="length" type="uint"/>
> + <arg name="style" type="uint" enum="preedit_style"/>
> + </event>
> +
> + <event name="preedit_cursor">
> + <description summary="pre-edit cursor">
> + Sets the cursor position inside the composing text (as byte
> + offset) relative to the start of the composing text. When index is
> a
> + negative number no cursor is shown.
> +
> + When no preedit_cursor event is sent the cursor will be at the end
> of
> + the composing text by default.
> +
> + This event is handled as part of a following preedit_string event.
> + </description>
> + <arg name="index" type="int"/>
> + </event>
> +
> + <event name="commit_string">
> + <description summary="commit">
> + Notify when text should be inserted into the editor widget. The
> text to
> + commit could be either just a single character after a key press
> or the
> + result of some composing (pre-edit). It could be also an empty text
> + when some text should be removed (see delete_surrounding_text) or
> when
> + the input cursor should be moved (see cursor_position).
> +
> + Any previously set composing text should be removed.
> + </description>
> + <arg name="serial" type="uint" summary="serial of the latest known
> text input state"/>
> + <arg name="text" type="string"/>
> + </event>
> +
> + <event name="cursor_position">
> + <description summary="set cursor to new position">
> + Notify when the cursor or anchor position should be modified.
> +
> + This event should be handled as part of a following commit_string
> + event.
> +
> + The text between anchor and index should be selected.
> + </description>
> + <arg name="index" type="int" summary="position of cursor"/>
> + <arg name="anchor" type="int" summary="position of selection
> anchor"/>
> + </event>
> +
> + <event name="delete_surrounding_text">
> + <description summary="delete surrounding text">
> + Notify when the text around the current cursor position should be
> + deleted.
> +
> + Index is relative to the current cursor (in bytes).
> + Length is the length of deleted text (in bytes).
> +
> + This event should be handled as part of a following commit_string
> + or preedit_string event.
> + </description>
> + <arg name="index" type="int"/>
> + <arg name="length" type="uint"/>
> + </event>
> +
> + <event name="modifiers_map">
> + <description summary="modifiers map">
> + Transfer an array of 0-terminated modifiers names. The position in
> + the array is the index of the modifier as used in the modifiers
> + bitmask in the keysym event.
> + </description>
> + <arg name="map" type="array"/>
> + </event>
> +
> + <event name="keysym">
> + <description summary="keysym">
> + Notify when a key event was sent. Key events should not be used
> + for normal text input operations, which should be done with
> + commit_string, delete_surrounding_text, etc. The key event follows
> + the wl_keyboard key event convention. Sym is a XKB keysym, state a
> + wl_keyboard key_state. Modifiers are a mask for effective modifiers
> + (where the modifier indices are set by the modifiers_map event)
> + </description>
> + <arg name="serial" type="uint" summary="serial of the latest known
> text input state"/>
> + <arg name="time" type="uint"/>
> + <arg name="sym" type="uint"/>
> + <arg name="state" type="uint"/>
> + <arg name="modifiers" type="uint"/>
> + </event>
> +
> + <event name="language">
> + <description summary="language">
> + Sets the language of the input text. The "language" argument is a
> RFC-3066
> + format language tag.
> + </description>
> + <arg name="serial" type="uint" summary="serial of the latest known
> text input state"/>
> + <arg name="language" type="string"/>
> + </event>
> +
> + <enum name="text_direction">
> + <entry name="auto" value="0" summary="automatic text direction
> based on text and language"/>
> + <entry name="ltr" value="1" summary="left-to-right"/>
> + <entry name="rtl" value="2" summary="right-to-left"/>
> + </enum>
> +
> + <event name="text_direction">
> + <description summary="text direction">
> + Sets the text direction of input text.
> +
> + It is mainly needed for showing input cursor on correct side of the
> + editor when there is no input yet done and making sure neutral
> + direction text is laid out properly.
> + </description>
> + <arg name="serial" type="uint" summary="serial of the latest known
> text input state"/>
> + <arg name="direction" type="uint" enum="text_direction"/>
> + </event>
> +
> + <event name="configure_surrounding_text">
> + <description summary="configure amount of surrounding text to be
> sent">
> + Configure what amount of surrounding text is expected by the
> + input method. The surrounding text will be sent in the
> + set_surrounding_text request on the following state information
> updates.
> + </description>
> + <arg name="before_cursor" type="int"/>
> + <arg name="after_cursor" type="int"/>
> + </event>
> +
> + <event name="input_method_changed">
> + <description summary="Notifies about a changed input method">
> + The input method changed on compositor side, which invalidates all
> + current state information. New state information should be sent
> from
> + the client via state requests (set_surrounding_text,
> + set_content_hint, ...) and update_state.
> + </description>
> + <arg name="serial" type="uint" summary="serial to synchronize state
> information"/>
> + <arg name="flags" type="uint" summary="currently unused"/>
> + </event>
> + </interface>
> +
> + <interface name="zwp_text_input_manager_v2" version="1">
> + <description summary="text input manager">
> + A factory for text-input objects. This object is a global singleton.
> + </description>
> +
> + <request name="destroy" type="destructor">
> + <description summary="Destroy the wp_text_input_manager">
> + Destroy the wp_text_input_manager object.
> + </description>
> + </request>
> +
> + <request name="get_text_input">
> + <description summary="create a new text input object">
> + Creates a new text-input object for a given seat.
> + </description>
> + <arg name="id" type="new_id" interface="zwp_text_input_v2"/>
> + <arg name="seat" type="object" interface="wl_seat"/>
> + </request>
> + </interface>
> +</protocol>
> --
> 2.5.0
>
>
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