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/**
* @file llchatentry.h
* @author Paul Guslisty
* @brief Text editor widget which is used for user input
*
* Features:
* Optional line history so previous entries can be recalled by CTRL UP/DOWN
* Optional auto-resize behavior on input chat field
*
* $LicenseInfo:firstyear=2001&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2012, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LLCHATENTRY_H_
#define LLCHATENTRY_H_
#include "lltexteditor.h"
class LLChatEntry : public LLTextEditor
{
public:
struct Params : public LLInitParam::Block<Params, LLTextEditor::Params>
{
Optional<bool> has_history,
is_expandable;
Optional<int> expand_lines_count;
Params();
};
virtual ~LLChatEntry();
protected:
friend class LLUICtrlFactory;
LLChatEntry(const Params& p);
/*virtual*/ void beforeValueChange();
/*virtual*/ void onValueChange(S32 start, S32 end);
/*virtual*/ bool useLabel() const;
public:
virtual void draw();
virtual void onCommit();
/*virtual*/ void onFocusReceived();
/*virtual*/ void onFocusLost();
void enableSingleLineMode(bool single_line_mode);
boost::signals2::connection setTextExpandedCallback(const commit_signal_t::slot_type& cb);
private:
/**
* Implements auto-resize behavior.
* When user's typing reaches the right edge of the chat field
* the chat field expands vertically by one line. The bottom of
* the chat field remains bottom-justified. The chat field does
* not expand beyond mExpandLinesCount.
*/
void expandText();
/**
* Implements line history so previous entries can be recalled by CTRL UP/DOWN
*/
void updateHistory();
bool handleSpecialKey(const KEY key, const MASK mask);
// Fired when text height expanded to mExpandLinesCount
commit_signal_t* mTextExpandedSignal;
// line history support:
typedef std::vector<std::string> line_history_t;
line_history_t::iterator mCurrentHistoryLine; // currently browsed history line
line_history_t mLineHistory; // line history storage
bool mHasHistory; // flag for enabled/disabled line history
bool mIsExpandable;
bool mSingleLineMode;
S32 mExpandLinesCount;
S32 mPrevLinesCount;
S32 mPrevExpandedLineCount;
};
#endif /* LLCHATENTRY_H_ */
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