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/**
* @file llscrollbar.h
* @brief Scrollbar UI widget
*
* $LicenseInfo:firstyear=2001&license=viewergpl$
*
* Copyright (c) 2001-2008, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#ifndef LL_SCROLLBAR_H
#define LL_SCROLLBAR_H
#include "stdtypes.h"
#include "lluictrl.h"
#include "v4color.h"
//
// Constants
//
const S32 SCROLLBAR_SIZE = 16;
//
// Classes
//
class LLScrollbar
: public LLUICtrl
{
public:
enum ORIENTATION { HORIZONTAL, VERTICAL };
LLScrollbar(const std::string& name, LLRect rect,
ORIENTATION orientation,
S32 doc_size, S32 doc_pos, S32 page_size,
void(*change_callback)( S32 new_pos, LLScrollbar* self, void* userdata ),
void* callback_user_data = NULL,
S32 step_size = 1);
virtual ~LLScrollbar();
virtual void setValue(const LLSD& value);
// Overrides from LLView
virtual BOOL handleKeyHere(KEY key, MASK mask);
virtual BOOL handleMouseDown(S32 x, S32 y, MASK mask);
virtual BOOL handleMouseUp(S32 x, S32 y, MASK mask);
virtual BOOL handleHover(S32 x, S32 y, MASK mask);
virtual BOOL handleScrollWheel(S32 x, S32 y, S32 clicks);
virtual BOOL handleDragAndDrop(S32 x, S32 y, MASK mask, BOOL drop,
EDragAndDropType cargo_type, void *cargo_data, EAcceptance *accept, std::string &tooltip_msg);
virtual void reshape(S32 width, S32 height, BOOL called_from_parent = TRUE);
virtual void draw();
// How long the "document" is.
void setDocSize( S32 size );
S32 getDocSize() const { return mDocSize; }
// How many "lines" the "document" has scrolled.
// 0 <= DocPos <= DocSize - DocVisibile
void setDocPos( S32 pos );
S32 getDocPos() const { return mDocPos; }
BOOL isAtBeginning();
BOOL isAtEnd();
// Setting both at once.
void setDocParams( S32 size, S32 pos );
// How many "lines" of the "document" is can appear on a page.
void setPageSize( S32 page_size );
S32 getPageSize() const { return mPageSize; }
// The farthest the document can be scrolled (top of the last page).
S32 getDocPosMax() const { return llmax( 0, mDocSize - mPageSize); }
void pageUp(S32 overlap);
void pageDown(S32 overlap);
static void onLineUpBtnPressed(void* userdata);
static void onLineDownBtnPressed(void* userdata);
void setTrackColor( const LLColor4& color ) { mTrackColor = color; }
void setThumbColor( const LLColor4& color ) { mThumbColor = color; }
void setHighlightColor( const LLColor4& color ) { mHighlightColor = color; }
void setShadowColor( const LLColor4& color ) { mShadowColor = color; }
void setOnScrollEndCallback(void (*callback)(void*), void* userdata) { mOnScrollEndCallback = callback; mOnScrollEndData = userdata;}
private:
void updateThumbRect();
void changeLine(S32 delta, BOOL update_thumb );
void (*mChangeCallback)( S32 new_pos, LLScrollbar* self, void* userdata );
void* mCallbackUserData;
const ORIENTATION mOrientation;
S32 mDocSize; // Size of the document that the scrollbar is modeling. Units depend on the user. 0 <= mDocSize.
S32 mDocPos; // Position within the doc that the scrollbar is modeling, in "lines" (user size)
S32 mPageSize; // Maximum number of lines that can be seen at one time.
S32 mStepSize;
BOOL mDocChanged;
LLRect mThumbRect;
S32 mDragStartX;
S32 mDragStartY;
F32 mHoverGlowStrength;
F32 mCurGlowStrength;
LLRect mOrigRect;
S32 mLastDelta;
LLColor4 mTrackColor;
LLColor4 mThumbColor;
LLColor4 mFocusColor;
LLColor4 mHighlightColor;
LLColor4 mShadowColor;
void (*mOnScrollEndCallback)(void*);
void *mOnScrollEndData;
};
#endif // LL_SCROLLBAR_H
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