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/**
* @file llpreeditor.h
* @brief abstract class that defines interface for components to feedback preedits to users.
*
* Copyright (c) 2000-$CurrentYear$, Linden Research, Inc.
* $License$
*/
#ifndef LL_PREEDITOR
#define LL_PREEDITOR
class LLPreeditor
{
public:
typedef std::vector<S32> segment_lengths_t;
typedef std::vector<BOOL> standouts_t;
// We don't delete against LLPreeditor, but compilers complain without this...
virtual ~LLPreeditor() {};
// Discard any preedit info. on this preeditor.
virtual void resetPreedit() = 0;
// Update the preedit feedback using specified details.
// Existing preedit is discarded and replaced with the new one. (I.e., updatePreedit is not cumulative.)
// All arguments are IN.
// preedit_count is the number of elements in arrays preedit_list and preedit_standouts.
// preedit list is an array of preedit texts (clauses.)
// preedit_standouts indicates whether each preedit text should be shown as standout clause.
// caret_position is the preedit-local position of text editing caret, in # of llwchar.
virtual void updatePreedit(const LLWString &preedit_string,
const segment_lengths_t &preedit_segment_lengths, const standouts_t &preedit_standouts, S32 caret_position) = 0;
// Turn the specified sub-contents into an active preedit.
// Both position and length are IN and count with UTF-32 (llwchar) characters.
// This method primarily facilitates reconversion.
virtual void markAsPreedit(S32 position, S32 length) = 0;
// Get the position and the length of the active preedit in the contents.
// Both position and length are OUT and count with UTF-32 (llwchar) characters.
// When this preeditor has no active preedit, position receives
// the caret position, and length receives 0.
virtual void getPreeditRange(S32 *position, S32 *length) const = 0;
// Get the position and the length of the current selection in the contents.
// Both position and length are OUT and count with UTF-32 (llwchar) characters.
// When this preeditor has no selection, position receives
// the caret position, and length receives 0.
virtual void getSelectionRange(S32 *position, S32 *length) const = 0;
// Get the locations where the preedit and related UI elements are displayed.
// Locations are relative to the app window and measured in GL coordinate space (before scaling.)
// query_position is IN argument, and other three are OUT.
virtual BOOL getPreeditLocation(S32 query_position, LLCoordGL *coord, LLRect *bounds, LLRect *control) const = 0;
// Get the size (height) of the current font used in this preeditor.
virtual S32 getPreeditFontSize() const = 0;
// Get the contents of this preeditor as a LLWString. If there is an active preedit,
// the returned LLWString contains it.
virtual const LLWString & getWText() const = 0;
// Handle a UTF-32 char on this preeditor, i.e., add the character
// to the contents.
// This is a back door of the method of same name of LLWindowCallback.
// called_from_parent should be set to FALSE if calling through LLPreeditor.
virtual BOOL handleUnicodeCharHere(llwchar uni_char, BOOL called_from_parent) = 0;
};
#endif
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