dgui.scrollbar source code

1 /** DGui project file.
2 
3 Copyright: Trogu Antonio Davide 2011-2013
4 
5 License: $(HTTP boost.org/LICENSE_1_0.txt, Boost License 1.0).
6 
7 Authors: Trogu Antonio Davide
8 */
9 module dgui.scrollbar;
10 
11 import dgui.core.controls.control; //?? Control ??
12 import dgui.core.winapi;
13 
14 enum ScrollBarType
15 {
16 	vertical = SB_VERT,
17 	horizontal = SB_HORZ,
18 	separate = SB_CTL,
19 }
20 
21 class ScrollBar: Control
22 {
23 	private ScrollBarType _sbt;
24 
25 	public this()
26 	{
27 		this._sbt = ScrollBarType.separate;
28 	}
29 
30 	private this(Control c, ScrollBarType sbt)
31 	{
32 		this._handle = c.handle;
33 		this._sbt = sbt;
34 	}
35 
36 	private void setInfo(uint mask, SCROLLINFO* si)
37 	{
38 		si.cbSize = SCROLLINFO.sizeof;
39 		si.fMask = mask | SIF_DISABLENOSCROLL;
40 
41 		SetScrollInfo(this._handle, this._sbt, si, true);
42 	}
43 
44 	private void getInfo(uint mask, SCROLLINFO* si)
45 	{
46 		si.cbSize = SCROLLINFO.sizeof;
47 		si.fMask = mask;
48 
49 		GetScrollInfo(this._handle, this._sbt, si);
50 	}
51 
52 	public void setRange(uint min, uint max)
53 	{
54 		if(this.created)
55 		{
56 			SCROLLINFO si;
57 			si.nMin = min;
58 			si.nMax = max;
59 
60 			this.setInfo(SIF_RANGE, &si);
61 		}
62 	}
63 
64 	public void increment(int amount = 1)
65 	{
66 		this.position = this.position + amount;
67 	}
68 
69 	public void decrement(int amount = 1)
70 	{
71 		this.position = this.position - amount;
72 	}
73 
74 	@property public uint minRange()
75 	{
76 		if(this.created)
77 		{
78 			SCROLLINFO si;
79 
80 			this.getInfo(SIF_RANGE, &si);
81 			return si.nMin;
82 		}
83 
84 		return -1;
85 	}
86 
87 	@property public uint maxRange()
88 	{
89 		if(this.created)
90 		{
91 			SCROLLINFO si;
92 
93 			this.getInfo(SIF_RANGE, &si);
94 			return si.nMax;
95 		}
96 
97 		return -1;
98 	}
99 
100 	@property public uint position()
101 	{
102 		if(this.created)
103 		{
104 			SCROLLINFO si;
105 
106 			this.getInfo(SIF_POS, &si);
107 			return si.nPos;
108 		}
109 
110 		return -1;
111 	}
112 
113 	@property public void position(uint p)
114 	{
115 		if(this.created)
116 		{
117 			SCROLLINFO si;
118 			si.nPos = p;
119 
120 			this.setInfo(SIF_POS, &si);
121 		}
122 	}
123 
124 	@property public uint page()
125 	{
126 		if(this.created)
127 		{
128 			SCROLLINFO si;
129 
130 			this.getInfo(SIF_PAGE, &si);
131 			return si.nPage;
132 		}
133 
134 		return -1;
135 	}
136 
137 	@property public void page(uint p)
138 	{
139 		if(this.created)
140 		{
141 			SCROLLINFO si;
142 			si.nPage = p;
143 
144 			this.setInfo(SIF_PAGE, &si);
145 		}
146 	}
147 
148 	public static ScrollBar fromControl(Control c, ScrollBarType sbt)
149 	{
150 		assert(sbt !is ScrollBarType.separate, "ScrollBarType.separate not allowed here");
151 		return new ScrollBar(c, sbt);
152 	}
153 }