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/**
* @file llscrollbar.h
* @brief Scrollbar UI widget
*
* $LicenseInfo:firstyear=2001&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, 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 LL_SCROLLBAR_H
#define LL_SCROLLBAR_H
#include "stdtypes.h"
#include "lluictrl.h"
#include "v4color.h"
#include "llbutton.h"
//
// Classes
//
class LLScrollbar
: public LLUICtrl
{
public:
enum ORIENTATION { HORIZONTAL, VERTICAL };
typedef boost::function<void (S32, LLScrollbar*)> callback_t;
struct Params
: public LLInitParam::Block<Params, LLUICtrl::Params>
{
Mandatory<ORIENTATION> orientation;
Mandatory<S32> doc_size;
Mandatory<S32> doc_pos;
Mandatory<S32> page_size;
Optional<callback_t> change_callback;
Optional<S32> step_size;
Optional<S32> thickness;
Optional<LLUIImage*> thumb_image_vertical,
thumb_image_horizontal,
track_image_horizontal,
track_image_vertical;
Optional<bool> bg_visible;
Optional<LLUIColor> track_color,
thumb_color,
bg_color;
Optional<LLButton::Params> up_button;
Optional<LLButton::Params> down_button;
Optional<LLButton::Params> left_button;
Optional<LLButton::Params> right_button;
Params();
};
protected:
LLScrollbar (const Params & p);
friend class LLUICtrlFactory;
public:
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 handleDoubleClick(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
bool setDocPos( S32 pos, BOOL update_thumb = TRUE );
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);
void onLineUpBtnPressed(const LLSD& data);
void onLineDownBtnPressed(const LLSD& data);
private:
void updateThumbRect();
bool changeLine(S32 delta, BOOL update_thumb );
callback_t mChangeCallback;
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;
LLUIColor mTrackColor;
LLUIColor mThumbColor;
LLUIColor mBGColor;
bool mBGVisible;
LLUIImagePtr mThumbImageV;
LLUIImagePtr mThumbImageH;
LLUIImagePtr mTrackImageV;
LLUIImagePtr mTrackImageH;
S32 mThickness;
};
#endif // LL_SCROLLBAR_H
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