InputEngine QML Type

Maps the user input to the input methods. More...

Import Statement: import QtQuick.VirtualKeyboard
Instantiates: QVirtualKeyboardInputEngine




Detailed Description

The input engine is responsible for routing input events to input methods. The actual input logic is implemented by the input methods.

The input engine also includes the default input method, which takes care of default processing if the active input method does not handle the event.

Property Documentation

activeKey : int [read-only]

Currently pressed key.

inputMethod : InputMethod

Use this property to set the active input method, or to monitor when the active input method changes.

inputMode : int

Use this property to get or set the current input mode. The InputEngine::inputModes property provides the list of valid input modes for the current input method and locale.

The predefined input modes are:

  • InputEngine.InputMode.Latin The default input mode for latin text.
  • InputEngine.InputMode.Numeric Only numeric input is allowed.
  • InputEngine.InputMode.Dialable Only dialable input is allowed.
  • InputEngine.InputMode.Pinyin Pinyin input mode for Chinese.
  • InputEngine.InputMode.Cangjie Cangjie input mode for Chinese.
  • InputEngine.InputMode.Zhuyin Zhuyin input mode for Chinese.
  • InputEngine.InputMode.Hangul Hangul input mode for Korean.
  • InputEngine.InputMode.Hiragana Hiragana input mode for Japanese.
  • InputEngine.InputMode.Katakana Katakana input mode for Japanese.
  • InputEngine.InputMode.FullwidthLatin Fullwidth latin input mode for East Asian languages.
  • InputEngine.InputMode.Greek Greek input mode.
  • InputEngine.InputMode.Cyrillic Cyrillic input mode.
  • InputEngine.InputMode.Arabic Arabic input mode.
  • InputEngine.InputMode.Hebrew Hebrew input mode.
  • InputEngine.InputMode.ChineseHandwriting Chinese handwriting.
  • InputEngine.InputMode.JapaneseHandwriting Japanese handwriting.
  • InputEngine.InputMode.KoreanHandwriting Korean handwriting.
  • InputEngine.InputMode.Thai Thai input mode.
  • InputEngine.InputMode.Stroke Stroke input mode for Chinese.
  • InputEngine.InputMode.Romaji Romaji input mode for Japanese.

inputModes : list<int> [read-only]

The list of available input modes is dependent on the input method and locale. This property is updated when either of the dependencies change.

patternRecognitionModes : list<int> [read-only, since QtQuick.VirtualKeyboard 2.0]

The list of available pattern recognition modes.

Possible values:

InputEngine.PatternRecognitionMode.NonePattern recognition is not available.
InputEngine.PatternRecognitionMode.PatternRecognitionDisabledobsolete - Use None instead.
InputEngine.PatternRecognitionMode.HandwritingPattern recognition mode for handwriting recognition.
InputEngine.PatternRecognitionMode.HandwritingRecoginitionobsolete - Use Handwriting instead.

This property was introduced in QtQuick.VirtualKeyboard 2.0.

previousKey : int [read-only]

Previously pressed key.

wordCandidateListModel : SelectionListModel [read-only]

Use this property to access the list model for the word candidate list.

wordCandidateListVisibleHint : bool [read-only]

Use this property to check if the word candidate list should be visible in the UI.

Signal Documentation

void activeKeyChanged(int key)

Indicates that the active key has changed.

Note: The corresponding handler is onActiveKeyChanged.

void inputMethodChanged()

Indicates that the input method has changed.

Note: The corresponding handler is onInputMethodChanged.

void inputMethodReset()

Emitted when the input method needs to be reset.

Note: This signal is automatically connected to QVirtualKeyboardAbstractInputMethod::reset() and InputMethod::reset() when the input method is activated.

Note: The corresponding handler is onInputMethodReset.

void inputMethodUpdate()

Note: This signal is automatically connected to QVirtualKeyboardAbstractInputMethod::update() and InputMethod::update() when the input method is activated.

Note: The corresponding handler is onInputMethodUpdate.

void inputModeChanged()

Indicates that the input mode has changed.

Note: The corresponding handler is onInputModeChanged.

void inputModesChanged()

Indicates that the available input modes have changed.

Note: The corresponding handler is onInputModesChanged.

[since QtQuick.VirtualKeyboard 2.0] void patternRecognitionModesChanged()

Indicates that the available pattern recognition modes have changed.

The predefined pattern recognition modes are:

  • InputEngine.PatternRecognitionMode.None Pattern recognition is not available.
  • InputEngine.PatternRecognitionMode.PatternRecognitionDisabled obsolete Use InputEngine.PatternRecognitionMode.None
  • InputEngine.PatternRecognitionMode.Handwriting Pattern recognition mode for handwriting recognition.
  • InputEngine.PatternRecognitionMode.HandwritingRecoginition obsolete Use InputEngine.PatternRecognitionMode.Handwriting

Note: The corresponding handler is onPatternRecognitionModesChanged.

This signal was introduced in QtQuick.VirtualKeyboard 2.0.

void previousKeyChanged(int key)

Indicates that the previous key has changed.

Note: The corresponding handler is onPreviousKeyChanged.

void virtualKeyClicked(int key, string text, int modifiers)

Indicates that the virtual key was clicked with the given text and modifiers. This signal is emitted after the input method has processed the key event.

Note: The corresponding handler is onVirtualKeyClicked.

Method Documentation

[since QtQuick.VirtualKeyboard 2.0] Trace traceBegin(int traceId, int patternRecognitionMode, var traceCaptureDeviceInfo, var traceScreenInfo)

Starts a trace interaction with the input engine.

The trace is uniquely identified by the traceId. The input engine will assign the id to the Trace object if the input method accepts the event.

The patternRecognitionMode specifies the recognition mode used for the pattern.

If the current input method accepts the event it returns a Trace object associated with this interaction. If the input method discards the event, it returns a null value.

The traceCaptureDeviceInfo provides information about the source device and the traceScreenInfo provides information about the screen context.

By definition, the Trace object remains valid until the traceEnd() method is called.

The trace interaction is ended by calling the InputEngine.traceEnd() method.

This method was introduced in QtQuick.VirtualKeyboard 2.0.

bool traceEnd(Trace trace)

Ends the trace interaction with the input engine.

The trace object may be discarded at any point after calling this function.

The function returns true if the trace interaction was accepted (i.e. the touch events should not be used for anything else).

void virtualKeyCancel()

Reverts the active key state without emitting the key event. This method is useful when the user discards the current key and the key state needs to be restored.

bool virtualKeyClick(int key, string text, int modifiers)

Emits a key click event for the given key, text and modifiers. Returns true if the key event was accepted by the input engine.

bool virtualKeyPress(int key, string text, int modifiers, bool repeat)

Called by the keyboard layer to indicate that key was pressed, with the given text and modifiers.

The key is set as an active key (down key). The actual key event is triggered when the key is released by the virtualKeyRelease() method. The key press event can be discarded by calling virtualKeyCancel().

The key press also initiates the key repeat timer if repeat is true.

Returns true if the key was accepted by this input engine.

See also virtualKeyCancel() and virtualKeyRelease().

bool virtualKeyRelease(int key, string text, int modifiers)

Releases the key at key. The method emits a key event for the input method if the event has not been generated by a repeating timer. The text and modifiers are passed to the input method.

Returns true if the key was accepted by the input engine.

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