QInputMethod Class

成员函数

[slot] void QInputMethod::commit()

Commits the word user is currently composing to the editor. The function is mostly needed by the input methods with text prediction features and by the methods where the script used for typing characters is different from the script that actually gets appended to the editor. Any kind of action that interrupts the text composing needs to flush the composing state by calling the commit() function, for example when the cursor is moved elsewhere.

[slot] void QInputMethod::hide()

Requests virtual keyboard to close.

Normally applications should not need to call this function, keyboard should automatically close when the text editor loses focus, for example when the parent view is closed.

QRectF QInputMethod::inputItemRectangle() const

Returns the input item's geometry in input item coordinates.

This function was introduced in Qt 5.1.

参见 setInputItemRectangle().

QTransform QInputMethod::inputItemTransform() const

Returns the transformation from input item coordinates to the window coordinates.

参见 setInputItemTransform().

[slot] void QInputMethod::invokeAction(Action a, int cursorPosition)

Called by the input item when the word currently being composed is tapped by the user, as indicated by the action a and the given cursorPosition. Input methods often use this information to offer more word suggestions to the user.

[static] QVariant QInputMethod::queryFocusObject(Qt::InputMethodQuery query, QVariant argument)

Send query to the current focus object with parameters argument and return the result.

[slot] void QInputMethod::reset()

Resets the input method state. For example, a text editor normally calls this method before inserting a text to make widget ready to accept a text.

Input method resets automatically when the focused editor changes.

void QInputMethod::setInputItemRectangle(const QRectF &rect)

Sets the input item's geometry to be rect, in input item coordinates. This needs to be updated by the focused window like QQuickCanvas whenever item is moved inside the scene, or focus is changed.

This function was introduced in Qt 5.1.

参见 inputItemRectangle().

void QInputMethod::setInputItemTransform(const QTransform &transform)

Sets the transformation from input item coordinates to window coordinates to be transform. Item transform needs to be updated by the focused window like QQuickCanvas whenever item is moved inside the scene.

参见 inputItemTransform().

void QInputMethod::setVisible(bool visible)

Controls the keyboard visibility. Equivalent to calling show() (if visible is true) or hide() (if visible is false).

参见 isVisible(), show(), and hide().

[slot] void QInputMethod::show()

Requests virtual keyboard to open. If the platform doesn't provide virtual keyboard the visibility remains false.

Normally applications should not need to call this function, keyboard should automatically open when the text editor gains focus.

[slot] void QInputMethod::update(Qt::InputMethodQueries queries)

Called by the input item to inform the platform input methods when there has been state changes in editor's input method query attributes. When calling the function queries parameter has to be used to tell what has changes, which input method can use to make queries for attributes it's interested with QInputMethodQueryEvent.

In particular calling update whenever the cursor position changes is important as that often causes other query attributes like surrounding text and text selection to change as well. The attributes that often change together with cursor position have been grouped in Qt::ImQueryInput value for convenience.