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
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
using System;
using System.Diagnostics;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using Cairo;
using System.Xml.Serialization;
using OpenTK.Input;
using System.ComponentModel;
namespace go
{
public class Scroller : Container, IValueChange
{
#region IValueChange implementation
public event EventHandler<ValueChangeEventArgs> ValueChanged;
#endregion
bool _verticalScrolling;
bool _horizontalScrolling;
bool _scrollbarVisible;
double _scrollX = 0.0;
double _scrollY = 0.0;
int scrollSpeed;
#region public properties
[XmlAttributeAttribute][DefaultValue(false)]
public bool VerticalScrolling {
get { return _verticalScrolling; }
set { _verticalScrolling = value; }
}
[XmlAttributeAttribute][DefaultValue(false)]
public bool HorizontalScrolling {
get { return _horizontalScrolling; }
set { _horizontalScrolling = value; }
}
[XmlAttributeAttribute][DefaultValue(true)]
public bool ScrollbarVisible {
get { return _scrollbarVisible; }
set { _scrollbarVisible = value; }
}
[XmlAttributeAttribute][DefaultValue(0.0)]
public double ScrollX {
get {
return _scrollX;
}
set {
if (_scrollX == value)
return;
if (value < 0.0)
_scrollX = 0.0;
else if (value > Child.Slot.Width - ClientRectangle.Width)
_scrollX = Math.Max(0.0, Child.Slot.Width - ClientRectangle.Width);
else
_scrollX = value;
ValueChanged.Raise(this, new ValueChangeEventArgs("ScrollX", _scrollX));
RegisterForRedraw();
}
}
[XmlAttributeAttribute][DefaultValue(0.0)]
public double ScrollY {
get {
return _scrollY;
}
set {
if (_scrollY == value)
return;
if (value < 0.0)
_scrollY = 0.0;
else if (value > Child.Slot.Height - ClientRectangle.Height)
_scrollY = Math.Max(0.0,Child.Slot.Height - ClientRectangle.Height);
else
_scrollY = value;
ValueChanged.Raise(this, new ValueChangeEventArgs("ScrollY", _scrollY));
RegisterForRedraw();
}
}
[XmlIgnore]
public int MaximumScroll {
get {
return VerticalScrolling ?
child == null ? 0 : Child.Slot.Height - ClientRectangle.Height :
Child.Slot.Width - ClientRectangle.Width;
}
}
[XmlAttributeAttribute][DefaultValue(30)]
public int ScrollSpeed {
get { return scrollSpeed; }
set {
scrollSpeed = value;
ValueChanged.Raise(this, new ValueChangeEventArgs("ScrollSpeed", scrollSpeed));
}
}
#endregion
public Scroller()
: base()
{
}
#region GraphicObject Overrides
void OnChildLayoutChanges (object sender, LayoutChangeEventArgs arg)
{
int maxScroll = MaximumScroll;
if (_verticalScrolling) {
if (arg.LayoutType == LayoutingType.Height) {
if (maxScroll < ScrollY) {
Debug.WriteLine ("scrolly={0} maxscroll={1}", ScrollY, maxScroll);
ScrollY = 0;
}
ValueChanged.Raise (this, new ValueChangeEventArgs ("MaximumScroll", maxScroll));
}
} else if (arg.LayoutType == LayoutingType.Width) {
if (maxScroll < ScrollX)
ScrollX = 0;
ValueChanged.Raise (this, new ValueChangeEventArgs ("MaximumScroll", maxScroll));
}
}
void onChildListCleared(object sender, EventArgs e){
ScrollY = 0;
ScrollX = 0;
}
public override T SetChild<T> (T _child)
{
GraphicObject c = child as GraphicObject;
Group g = child as Group;
if (c != null) {
c.LayoutChanged -= OnChildLayoutChanges;
if (g != null)
g.ChildrenCleared -= onChildListCleared;
}
c = _child as GraphicObject;
g = _child as Group;
if (c != null) {
c.LayoutChanged += OnChildLayoutChanges;
if (g != null)
g.ChildrenCleared += onChildListCleared;
}
return base.SetChild (_child);
}
#endregion
#region Mouse handling
public override bool MouseIsIn (Point m)
{
Debug.WriteLine ("Mouse in scroller: {0} scr coord:{1} mouse:{2}",
base.ScreenCoordinates (Slot).ContainsOrIsEqual (m),
base.ScreenCoordinates (Slot), m);
return Visible ? base.ScreenCoordinates(Slot).ContainsOrIsEqual (m) : false;
}
public override void checkHoverWidget (MouseMoveEventArgs e)
{
Point m = e.Position - new Point ((int)ScrollX, (int)ScrollY);
base.checkHoverWidget (new MouseMoveEventArgs(m.X,m.Y,e.XDelta,e.YDelta));
}
public override void onMouseWheel (object sender, MouseWheelEventArgs e)
{
//base.onMouseWheel (sender, e); base event buble to the top
// if (MouseWheelChanged!=null)
// MouseWheelChanged (this, e);
if (Child == null)
return;
if (VerticalScrolling )
ScrollY -= e.Delta * ScrollSpeed;
if (HorizontalScrolling )
ScrollX -= e.Delta * ScrollSpeed;
}
#endregion
public override Rectangle ContextCoordinates (Rectangle r)
{
return base.ContextCoordinates (r) - new Point((int)ScrollX,(int)ScrollY);
}
public override Rectangle ScreenCoordinates (Rectangle r)
{
return base.ScreenCoordinates (r) - new Point((int)ScrollX,(int)ScrollY);
}
public override void registerClipRect ()
{
TopContainer.redrawClip.AddRectangle (base.ScreenCoordinates(Slot));
}
public override void Paint(ref Cairo.Context ctx, Rectangles clip = null)
{
if (!Visible)//check if necessary??
return;
ctx.Save();
// ctx.Rectangle(ContextCoordinates(Slot));
// ctx.Clip();
//
// if (clip != null)
// clip.clip(ctx);
//clip.Srcoll (this);
base.Paint (ref ctx, clip);
//clip to client zone
ctx.Rectangle(Parent.ContextCoordinates(ClientRectangle + Slot.Position));
ctx.Clip();
// if (clip != null)
// clip.Srcoll (this);
// if (clip != null)
// clip.Rebase(this);
if (Child != null)
Child.Paint(ref ctx, clip);
ctx.Restore();
}
}
}
|
