style_cascade.h
1 /*
2 ** ClanLib SDK
3 ** Copyright (c) 1997-2020 The ClanLib Team
4 **
5 ** This software is provided 'as-is', without any express or implied
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10 ** including commercial applications, and to alter it and redistribute it
11 ** freely, subject to the following restrictions:
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13 ** 1. The origin of this software must not be misrepresented; you must not
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15 ** in a product, an acknowledgment in the product documentation would be
16 ** appreciated but is not required.
17 ** 2. Altered source versions must be plainly marked as such, and must not be
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19 ** 3. This notice may not be removed or altered from any source distribution.
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21 ** Note: Some of the libraries ClanLib may link to may have additional
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23 **
24 ** File Author(s):
25 **
26 ** Magnus Norddahl
27 ** Mark Page
28 */
29 
30 #pragma once
31 
32 #include <memory>
33 #include <string>
34 #include <vector>
35 #include "style_get_value.h"
36 #include "property_hash.h"
37 
38 namespace clan
39 {
40  class Style;
41  class StyleGetValue;
42  class Canvas;
43  class Font;
44  class ViewGeometry;
45 
46 #if defined(MICROSOFT_FINALLY_IMPLEMENTED_CONSTEXPR_TEN_YEARS_AFTER_EVERYONE_ELSE)
47  class PropertyNameConst
49  {
50  public:
51  template<std::size_t Length>
52  constexpr PropertyNameConst(const char(&text)[Length]) : text(text), length(Length - 1) { }
53 
54  constexpr char operator[](std::size_t index) const { return index < length ? text[index] : throw std::out_of_range("PropertyNameConst operator[] out of bounds"); }
55  constexpr std::size_t size() const { return length; }
56  constexpr std::size_t hash() const { return hash(2166136261U, 0); }
57 
58  private:
59  constexpr std::size_t hash(std::size_t value, std::size_t index) const { return index == length ? value : hash((value ^ (std::size_t)text[index]) * 16777619U, index + 1); }
60 
61  const char * const text;
62  const std::size_t length;
63  };
64 #endif
65 
68  {
69  public:
71  StyleCascade(std::vector<Style *> cascade, const StyleCascade *parent = nullptr) : cascade(std::move(cascade)), parent(parent) { }
72 
74  std::vector<Style *> cascade;
75 
77  const StyleCascade *parent = nullptr;
78 
81 
84 
89 
92 
95 
98 
101 
104 
106  int array_size(PropertyHash hash) const;
107 
109  void render_background(Canvas &canvas, const ViewGeometry &geometry) const;
110 
112  void render_border(Canvas &canvas, const ViewGeometry &geometry) const;
113 
115  Font font(Canvas &canvas) const;
116  };
117 }
value is an angle
Definition: clanapp.h:35
2D Graphics Canvas
Definition: canvas.h:71
Definition: view_geometry.h:38
StyleGetValue cascade_value(PropertyHash hash) const
Find the first declared value in the cascade for the specified property.
void render_border(Canvas &canvas, const ViewGeometry &geometry) const
Render styled border.
StyleCascade()
Definition: style_cascade.h:70
StyleCascade(std::vector< Style *> cascade, const StyleCascade *parent=nullptr)
Definition: style_cascade.h:71
STL namespace.
const StyleCascade * parent
Parent cascade used for inheritance.
Definition: style_cascade.h:77
std::vector< Style * > cascade
Property sets to be examined.
Definition: style_cascade.h:74
StyleGetValue compute_time(const StyleGetValue &time) const
Convert time to seconds.
StyleGetValue compute_angle(const StyleGetValue &angle) const
Convert angle into radians.
StyleGetValue compute_length(const StyleGetValue &length) const
Convert length into px (device independent pixel) units.
StyleGetValue computed_value(PropertyHash hash) const
StyleGetValue compute_resolution(const StyleGetValue &resolution) const
Convert resolution to dots per px unit (pixel ratio scale)
StyleGetValue compute_frequency(const StyleGetValue &frequency) const
Convert frequency to Hz.
int array_size(PropertyHash hash) const
Value array size for the property.
value is a keyword
Font font(Canvas &canvas) const
Font used by this style cascade.
Style value returned by style classes.
Definition: style_get_value.h:39
Font class.
Definition: font.h:59
Style value resolver.
Definition: style_cascade.h:67
Definition: property_hash.h:34
StyleGetValue specified_value(PropertyHash hash) const
Resolve any inheritance or initial values for the cascade value.
void render_background(Canvas &canvas, const ViewGeometry &geometry) const
Render styled background.
Pointer left area.