forked from Unity-Technologies/UnityCsReference
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathSliderHandler.cs
More file actions
362 lines (301 loc) · 11.6 KB
/
SliderHandler.cs
File metadata and controls
362 lines (301 loc) · 11.6 KB
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
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
// Unity C# reference source
// Copyright (c) Unity Technologies. For terms of use, see
// https://unity3d.com/legal/licenses/Unity_Reference_Only_License
using System;
using UnityEngine.Scripting;
namespace UnityEngine
{
// State for when we're dragging a slider.
internal class SliderState
{
[RequiredByNativeCode] // Created by reflection from SliderHandler.SliderState
public SliderState() {}
public float dragStartPos;
public float dragStartValue;
public bool isDragging;
}
// TODO: Make the thumb positioning / sizing be right
internal struct SliderHandler
{
readonly Rect position;
readonly float currentValue;
readonly float size;
readonly float start;
readonly float end;
readonly GUIStyle slider;
readonly GUIStyle thumb;
readonly GUIStyle thumbExtent;
readonly bool horiz;
readonly int id;
public SliderHandler(Rect position, float currentValue, float size, float start, float end, GUIStyle slider, GUIStyle thumb, bool horiz, int id, GUIStyle thumbExtent = null)
{
this.position = position;
this.currentValue = currentValue;
this.size = size;
this.start = start;
this.end = end;
this.slider = slider;
this.thumb = thumb;
this.thumbExtent = thumbExtent;
this.horiz = horiz;
this.id = id;
}
public float Handle()
{
if (slider == null || thumb == null)
return currentValue;
switch (CurrentEventType())
{
case EventType.MouseDown:
return OnMouseDown();
case EventType.MouseDrag:
return OnMouseDrag();
case EventType.MouseUp:
return OnMouseUp();
case EventType.Repaint:
return OnRepaint();
}
return currentValue;
}
private float OnMouseDown()
{
var mousePosition = CurrentEvent().mousePosition;
Rect thumbZone = ThumbSelectionRect();
var mouseOverThumb = thumbZone.Contains(mousePosition);
Rect clickableZone = thumbZone;
clickableZone.x = position.x;
clickableZone.width = position.width;
// if the click is outside this control, just bail out...
if (IsEmptySlider() || (!mouseOverThumb && !clickableZone.Contains(mousePosition)))
return currentValue;
GUI.scrollTroughSide = 0;
GUIUtility.hotControl = id;
CurrentEvent().Use();
if (mouseOverThumb)
{
// We have a mousedown on the thumb
// Record where we're dragging from, so the user can get back.
StartDraggingWithValue(ClampedCurrentValue());
return currentValue;
}
GUI.changed = true;
// We're outside the thumb, but inside the trough.
// If we have a scrollSize, we do pgup/pgdn style movements
// if not, we just snap to the current position and begin tracking
if (SupportsPageMovements())
{
SliderState().isDragging = false;
GUI.nextScrollStepTime = SystemClock.now.AddMilliseconds(ScrollWaitDefinitions.firstWait);
GUI.scrollTroughSide = CurrentScrollTroughSide();
return PageMovementValue();
}
float newValue = ValueForCurrentMousePosition();
StartDraggingWithValue(newValue);
return Clamp(newValue);
}
private float OnMouseDrag()
{
if (GUIUtility.hotControl != id)
return currentValue;
var sliderState = SliderState();
if (!sliderState.isDragging)
return currentValue;
GUI.changed = true;
CurrentEvent().Use();
// Recalculate the value from the mouse position. this has the side effect that values are relative to the
// click point - no matter where inside the trough the original value was. Also means user can get back original value
// if he drags back to start position.
float deltaPos = MousePosition() - sliderState.dragStartPos;
var newValue = sliderState.dragStartValue + deltaPos / ValuesPerPixel();
return Clamp(newValue);
}
private float OnMouseUp()
{
if (GUIUtility.hotControl == id)
{
CurrentEvent().Use();
GUIUtility.hotControl = 0;
}
return currentValue;
}
private float OnRepaint()
{
bool hover = position.Contains(CurrentEvent().mousePosition);
slider.Draw(position, GUIContent.none, id, false, hover);
if (!IsEmptySlider() && currentValue >= Mathf.Min(start, end) && currentValue <= Mathf.Max(start, end))
{
if (thumbExtent != null)
thumbExtent.Draw(ThumbExtRect(), GUIContent.none, id, false, hover);
thumb.Draw(ThumbRect(), GUIContent.none, id, false, hover);
}
if (GUIUtility.hotControl != id || !hover || IsEmptySlider())
return currentValue;
if (ThumbRect().Contains(CurrentEvent().mousePosition))
{
if (GUI.scrollTroughSide != 0) // if was scrolling with "trough" and the thumb reached mouse - sliding action over
{
GUIUtility.hotControl = 0;
}
return currentValue;
}
GUI.InternalRepaintEditorWindow();
if (SystemClock.now < GUI.nextScrollStepTime)
return currentValue;
if (CurrentScrollTroughSide() != GUI.scrollTroughSide)
return currentValue;
GUI.nextScrollStepTime = SystemClock.now.AddMilliseconds(ScrollWaitDefinitions.regularWait);
if (SupportsPageMovements())
{
SliderState().isDragging = false;
GUI.changed = true;
return PageMovementValue();
}
return ClampedCurrentValue();
}
private EventType CurrentEventType()
{
return CurrentEvent().GetTypeForControl(id);
}
private int CurrentScrollTroughSide()
{
float mousePos = horiz ? CurrentEvent().mousePosition.x : CurrentEvent().mousePosition.y;
float thumbPos = horiz ? ThumbRect().x : ThumbRect().y;
return mousePos > thumbPos ? 1 : -1;
}
private bool IsEmptySlider()
{
return start == end;
}
private bool SupportsPageMovements()
{
return size != 0 && GUI.usePageScrollbars;
}
private float PageMovementValue()
{
var newValue = currentValue;
var sign = start > end ? -1 : 1;
if (MousePosition() > PageUpMovementBound())
newValue += size * sign * .9f;
else
newValue -= size * sign * .9f;
return Clamp(newValue);
}
private float PageUpMovementBound()
{
if (horiz)
return ThumbRect().xMax - position.x;
return ThumbRect().yMax - position.y;
}
private Event CurrentEvent()
{
return Event.current;
}
private float ValueForCurrentMousePosition()
{
if (horiz)
return (MousePosition() - ThumbRect().width * .5f) / ValuesPerPixel() + start - size * .5f;
return (MousePosition() - ThumbRect().height * .5f) / ValuesPerPixel() + start - size * .5f;
}
private float Clamp(float value)
{
return Mathf.Clamp(value, MinValue(), MaxValue());
}
private Rect ThumbSelectionRect()
{
var selectionRect = ThumbRect();
return selectionRect;
}
private void StartDraggingWithValue(float dragStartValue)
{
var state = SliderState();
state.dragStartPos = MousePosition();
state.dragStartValue = dragStartValue;
state.isDragging = true;
}
private SliderState SliderState()
{
return (SliderState)GUIUtility.GetStateObject(typeof(SliderState), id);
}
private Rect ThumbExtRect()
{
var rect = new Rect(0, 0, thumbExtent.fixedWidth, thumbExtent.fixedHeight);
rect.center = ThumbRect().center;
return rect;
}
private Rect ThumbRect()
{
return horiz ? HorizontalThumbRect() : VerticalThumbRect();
}
private Rect VerticalThumbRect()
{
Rect contentRect = thumb.margin.Remove(slider.padding.Remove(position));
float thumbWidth = (thumb.fixedWidth != 0 ? thumb.fixedWidth : contentRect.width);
var thumbSize = ThumbSize();
var valuesPerPixel = ValuesPerPixel();
if (start < end)
{
return new Rect(
contentRect.x,
(ClampedCurrentValue() - start) * valuesPerPixel + contentRect.y,
thumbWidth,
size * valuesPerPixel + thumbSize);
}
else
{
return new Rect(
contentRect.x,
(ClampedCurrentValue() + size - start) * valuesPerPixel + contentRect.y,
thumbWidth,
size * -valuesPerPixel + thumbSize);
}
}
private Rect HorizontalThumbRect()
{
Rect contentRect = thumb.margin.Remove(slider.padding.Remove(position));
float thumbHeight = (thumb.fixedHeight != 0 ? thumb.fixedHeight : contentRect.height);
var thumbSize = ThumbSize();
var valuesPerPixel = ValuesPerPixel();
if (start < end)
return new Rect(
(ClampedCurrentValue() - start) * valuesPerPixel + contentRect.x,
contentRect.y,
size * valuesPerPixel + thumbSize,
thumbHeight);
return new Rect(
(ClampedCurrentValue() + size - start) * valuesPerPixel + contentRect.x,
contentRect.y,
size * -valuesPerPixel + thumbSize,
thumbHeight);
}
private float ClampedCurrentValue()
{
return Clamp(currentValue);
}
private float MousePosition()
{
if (horiz)
return CurrentEvent().mousePosition.x - position.x;
return CurrentEvent().mousePosition.y - position.y;
}
private float ValuesPerPixel()
{
if (horiz)
return (position.width - slider.padding.horizontal - ThumbSize()) / (end - start);
return (position.height - slider.padding.vertical - ThumbSize()) / (end - start);
}
private float ThumbSize()
{
if (horiz)
return thumb.fixedWidth != 0 ? thumb.fixedWidth : thumb.padding.horizontal;
return thumb.fixedHeight != 0 ? thumb.fixedHeight : thumb.padding.vertical;
}
private float MaxValue()
{
return Mathf.Max(start, end) - size;
}
private float MinValue()
{
return Mathf.Min(start, end);
}
}
}