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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef UI_GFX_SHADOW_VALUE_H_ | |
| 6 #define UI_GFX_SHADOW_VALUE_H_ | |
| 7 | |
| 8 #include <string> | |
| 9 #include <vector> | |
| 10 | |
| 11 #include "third_party/skia/include/core/SkColor.h" | |
| 12 #include "ui/gfx/gfx_export.h" | |
| 13 #include "ui/gfx/point.h" | |
| 14 | |
| 15 namespace gfx { | |
| 16 | |
| 17 class Insets; | |
| 18 | |
| 19 class ShadowValue; | |
| 20 typedef std::vector<ShadowValue> ShadowValues; | |
| 21 | |
| 22 // ShadowValue encapsulates parameters needed to define a shadow, including the | |
| 23 // shadow's offset, blur amount and color. | |
| 24 class GFX_EXPORT ShadowValue { | |
| 25 public: | |
| 26 ShadowValue(); | |
| 27 ShadowValue(const gfx::Point& offset, double blur, SkColor color); | |
| 28 ~ShadowValue(); | |
| 29 | |
| 30 int x() const { return offset_.x(); } | |
| 31 int y() const { return offset_.y(); } | |
| 32 const gfx::Point& offset() const { return offset_; } | |
| 33 double blur() const { return blur_; } | |
| 34 SkColor color() const { return color_; } | |
| 35 | |
| 36 ShadowValue Scale(float scale) const; | |
| 37 | |
| 38 std::string ToString() const; | |
| 39 | |
| 40 // Gets margin space needed for shadows. Note that values in returned Insets | |
| 41 // are negative because shadow margins are outside a boundary. | |
| 42 static Insets GetMargin(const ShadowValues& shadows); | |
| 43 | |
| 44 private: | |
| 45 gfx::Point offset_; | |
| 46 | |
| 47 // Blur amount of the shadow in pixels. If underlying implementation supports | |
| 48 // (e.g. Skia), it can have fraction part such as 0.5 pixel. The value | |
| 49 // defines a range from full shadow color at the start point inside the | |
| 50 // shadow to fully transparent at the end point outside it. The range is | |
| 51 // perpendicular to and centered on the shadow edge. For example, a blur | |
| 52 // amount of 4.0 means to have a blurry shadow edge of 4 pixels that | |
| 53 // transitions from full shadow color to fully transparent and with 2 pixels | |
| 54 // inside the shadow and 2 pixels goes beyond the edge. | |
| 55 double blur_; | |
| 56 | |
| 57 SkColor color_; | |
| 58 }; | |
| 59 | |
| 60 } // namespace gfx | |
| 61 | |
| 62 #endif // UI_GFX_SHADOW_VALUE_H_ | |
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