-
Notifications
You must be signed in to change notification settings - Fork 21
/
BlurryUserControl.cs
321 lines (259 loc) · 11 KB
/
BlurryUserControl.cs
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
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Effects;
using System.Windows.Shapes;
using BlurryControls.Helpers;
using BlurryControls.Internals;
namespace BlurryControls.Controls
{
/// <summary>
/// UserControl which appears blurry over a given <see cref="BlurContainer" />
/// </summary>
//based on: https://stackoverflow.com/a/27447817/6649611 (2017/12)
public class BlurryUserControl : UserControl
{
#region Fields
private Rectangle _blur;
private bool _inDrag;
private Point _anchorPoint;
private Size _containerSize;
private Point _difference;
private double _scaleX;
private double _scaleY;
private const bool ShowUglyCurser = false;
#endregion
#region Dependecy Properties
public static readonly DependencyProperty BlurContainerProperty = DependencyProperty.Register(
"BlurContainer", typeof(UIElement), typeof(BlurryUserControl),
new PropertyMetadata(default(UIElement), OnBlurContainerChanged));
private static void OnBlurContainerChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var blurryUserControl = (BlurryUserControl) d;
blurryUserControl.UpdateVisual(e.OldValue as UIElement);
}
/// <summary>
/// represents the underlying element that will be blured
/// </summary>
public UIElement BlurContainer
{
get => (UIElement) GetValue(BlurContainerProperty);
set => SetValue(BlurContainerProperty, value);
}
public static readonly DependencyProperty BlurRadiusProperty = DependencyProperty.Register(
"BlurRadius", typeof(int), typeof(BlurryUserControl), new PropertyMetadata(10, OnBlurRadiusChanged));
private static void OnBlurRadiusChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var blurryUserControl = (BlurryUserControl) d;
blurryUserControl.UpdateVisual();
}
/// <summary>
/// impact of the blur
/// </summary>
public int BlurRadius
{
get => (int) GetValue(BlurRadiusProperty);
set => SetValue(BlurRadiusProperty, value);
}
public static readonly DependencyProperty RenderingBiasProperty = DependencyProperty.Register(
"RenderingBias", typeof(RenderingBias), typeof(BlurryUserControl),
new PropertyMetadata(RenderingBias.Quality, OnRenderingBiasChanged));
private static void OnRenderingBiasChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var blurryUserControl = (BlurryUserControl) d;
blurryUserControl.UpdateVisual();
}
/// <summary>
/// can be changed to RenderingBias.Performance when facing performance issues
/// </summary>
public RenderingBias RenderingBias
{
get => (RenderingBias) GetValue(RenderingBiasProperty);
set => SetValue(RenderingBiasProperty, value);
}
public static readonly DependencyProperty MagnificationProperty = DependencyProperty.Register(
"Magnification", typeof(double), typeof(BlurryUserControl), new PropertyMetadata(1.0d, OnMagnificationChanged));
private static void OnMagnificationChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var blurryUserControl = (BlurryUserControl)d;
blurryUserControl.UpdateVisual();
}
/// <summary>
/// magnify the area beneath the control to reduce bleed near borders of the <see cref="BlurContainer"/>
/// </summary>
public double Magnification
{
get => (double)GetValue(MagnificationProperty);
set => SetValue(MagnificationProperty, value);
}
private static readonly DependencyProperty BrushProperty = DependencyProperty.Register(
"Brush", typeof(VisualBrush), typeof(BlurryUserControl), new PropertyMetadata());
private VisualBrush Brush
{
get => (VisualBrush) GetValue(BrushProperty);
set => SetValue(BrushProperty, value);
}
public static readonly DependencyProperty DragMoveEnabledProperty = DependencyProperty.Register(
"DragMoveEnabled", typeof(bool), typeof(BlurryUserControl),
new PropertyMetadata(false, OnDragMoveEnabledChanged));
private static void OnDragMoveEnabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var blurryUserControl = (BlurryUserControl) d;
if ((bool) e.NewValue) blurryUserControl.ApplyDragHandles();
else blurryUserControl.RemoveDragHandles();
}
public bool DragMoveEnabled
{
get => (bool) GetValue(DragMoveEnabledProperty);
set => SetValue(DragMoveEnabledProperty, value);
}
#endregion
#region Constructor
static BlurryUserControl()
{
//ensure loading template of BlurryUserControl defined in Themes/Generic.xaml
DefaultStyleKeyProperty.OverrideMetadata(typeof(BlurryUserControl),
new FrameworkPropertyMetadata(typeof(BlurryUserControl)));
}
public BlurryUserControl()
{
Loaded += OnLoaded;
Background = Brushes.WhiteSmoke.OfStrength(0.2d);
}
private void OnLoaded(object sender, RoutedEventArgs routedEventArgs)
{
UpdateVisual();
if (DragMoveEnabled) ApplyDragHandles();
else RemoveDragHandles();
}
public override void OnApplyTemplate()
{
//initialize visual parts
_blur = (Rectangle) GetTemplateChild("Blur");
_blur?.SetBinding(Shape.FillProperty,
new Binding {Source = this, Path = new PropertyPath(BrushProperty)});
base.OnApplyTemplate();
}
#endregion
#region Drag
private void ApplyDragHandles()
{
// handle drag move
MouseMove += OnMouseMove;
MouseLeftButtonDown += OnMouseLeftButtonDown;
MouseLeftButtonUp += OnMouseLeftButtonUp;
// grabby hand
MouseEnter += OnMouseEnter;
}
private void RemoveDragHandles()
{
MouseMove -= OnMouseMove;
MouseLeftButtonDown -= OnMouseLeftButtonDown;
MouseLeftButtonUp -= OnMouseLeftButtonUp;
MouseEnter -= OnMouseEnter;
}
private void OnMouseEnter(object sender, MouseEventArgs mouseEventArgs)
{
// ReSharper disable once ConditionIsAlwaysTrueOrFalse
#pragma warning disable 162
if (ShowUglyCurser) Cursor = DragCursor.Grab.GetCursor();
#pragma warning restore 162
}
private void OnMouseMove(object sender, MouseEventArgs args)
{
if (!_inDrag) return;
// offset change
var currentPoint = args.GetPosition(null);
var currentTranslation = RenderTransform as TranslateTransform ?? new TranslateTransform(0, 0);
var movement = currentPoint - _anchorPoint;
// horizontal change
var newX = currentTranslation.X + movement.X;
var maxX = _containerSize.Width - Width + BorderThickness.Right;
var thresholdX = _difference.X + movement.X + BlurRadius * Magnification;
// vertical change
var newY = currentTranslation.Y + movement.Y;
var maxY = _containerSize.Height - Height + BorderThickness.Bottom;
var thresholdY = _difference.Y + movement.Y + BlurRadius * Magnification;
// determine new offset
var left = thresholdX > BorderThickness.Left ? thresholdX < maxX ? newX : currentTranslation.X : currentTranslation.X;
var top = thresholdY > BorderThickness.Top ? thresholdY < maxY ? newY : currentTranslation.Y : currentTranslation.Y;
RenderTransform = new TranslateTransform(left, top);
_anchorPoint = currentPoint;
args.Handled = true;
}
private void OnMouseLeftButtonDown(object sender, MouseButtonEventArgs args)
{
if (_inDrag) return;
_anchorPoint = args.GetPosition(null);
CaptureMouse();
_inDrag = true;
args.Handled = true;
// ReSharper disable once ConditionIsAlwaysTrueOrFalse
#pragma warning disable 162
if (ShowUglyCurser) Cursor = DragCursor.Grabbing.GetCursor();
#pragma warning restore 162
}
private void OnMouseLeftButtonUp(object sender, MouseButtonEventArgs args)
{
if (!_inDrag) return;
ReleaseMouseCapture();
_inDrag = false;
args.Handled = true;
// ReSharper disable once ConditionIsAlwaysTrueOrFalse
#pragma warning disable 162
if (ShowUglyCurser) Cursor = DragCursor.Grab.GetCursor();
#pragma warning restore 162
}
#endregion
#region Blur
private void RefreshBounds()
{
if (_blur == null || BlurContainer == null || Brush == null) return;
_difference = _blur.TranslatePoint(new Point(), BlurContainer);
_scaleX = 1 + 2 * BlurRadius * Magnification / RenderSize.Width;
_scaleY = 1 + 2 * BlurRadius * Magnification / RenderSize.Height;
var renderSize = new Size(RenderSize.Width * _scaleX, RenderSize.Height * _scaleY);
Brush.Viewbox = new Rect(_difference, renderSize);
_containerSize = BlurContainer.RenderSize;
}
private void RefreshEffect()
{
if (_blur == null) return;
_blur.Effect = new BlurEffect
{
Radius = BlurRadius,
KernelType = KernelType.Gaussian,
RenderingBias = RenderingBias
};
_blur.RenderTransform = new MatrixTransform(_scaleX, 0, 0, _scaleY, -BlurRadius * Magnification, -BlurRadius * Magnification);
}
private void UpdateVisual(UIElement oldBlurContainer = null)
{
if (oldBlurContainer != null)
oldBlurContainer.LayoutUpdated -= OnContainerLayoutUpdated;
if (BlurContainer != null && _blur != null)
{
Brush = new VisualBrush(BlurContainer)
{
ViewboxUnits = BrushMappingMode.Absolute,
Stretch = Stretch.None
};
BlurContainer.LayoutUpdated += OnContainerLayoutUpdated;
RefreshBounds();
RefreshEffect();
}
else
{
Brush = null;
}
}
private void OnContainerLayoutUpdated(object sender, EventArgs eventArgs)
{
RefreshBounds();
}
#endregion
}
}