summaryrefslogtreecommitdiff
path: root/indra/llui/llscrollbar.h
blob: ac0bd37e3ab13c395aa679e91182d24bd3498970 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/** 
 * @file llscrollbar.h
 * @brief Scrollbar UI widget
 *
 * $LicenseInfo:firstyear=2001&license=viewergpl$
 * 
 * Copyright (c) 2001-2007, 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://secondlife.com/developers/opensource/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://secondlife.com/developers/opensource/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 LLString& 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);

	virtual EWidgetType getWidgetType() const { return WIDGET_TYPE_SCROLLBAR; }
	virtual LLString getWidgetTag() const { return LL_SCROLLBAR_TAG; }

	// Overrides from LLView
	virtual BOOL	handleKeyHere(KEY key, MASK mask, BOOL called_from_parent);
	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, LLString &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