engine.ui.widgets.label source code

1 /*
2     Copyright © 2020, Luna Nielsen
3     Distributed under the 2-Clause BSD License, see LICENSE file.
4     
5     Authors: Luna Nielsen
6 */
7 module engine.ui.widgets.label;
8 import engine.ui;
9 import engine;
10 
11 /**
12     A label
13 */
14 class Label : Widget {
15 private:
16 
17 protected:
18     override {
19         /**
20             Code run when updating the widget
21         */
22         void onUpdate() { }
23 
24         /**
25             Code run when drawing
26         */
27         void onDraw() {
28             GameFont.changeSize(size);
29             GameFont.draw(this.text, vec2(area.x, area.y));
30             GameFont.flush();
31         }
32     }
33     
34 public:
35 
36     /**
37         The text buffer for the label
38     */
39     dstring text;
40 
41     /**
42         The font size
43     */
44     int size = 24;
45 
46     this(T)(T text, int size = 24) if (isString!T) {
47         super("Label");
48 
49         this.text = text.toEngineString();
50         this.size = size;
51     }
52 
53     /**
54         Set the text of the label
55         This function supports UTF8 text
56     */
57     void setText(T)(T text) if (isString!T) {
58         this.text = text.toEngineString();
59     }
60 
61 override:
62 
63     /**
64         Area of the widget
65     */
66     vec4 area() {
67         vec4 sArea = scissorArea();
68         return vec4(sArea.x-4, sArea.y-4, sArea.z+8, sArea.w+8);
69     }
70 
71     /**
72         Area in which the widget cuts out child widgets
73     */
74     vec4i scissorArea() {
75         GameFont.changeSize(size);
76         vec2 measure = GameFont.measure(text);
77         vec2 pos = this.calculatedPosition();
78         return vec4i(
79             cast(int)pos.x, 
80             cast(int)pos.y, 
81             cast(int)measure.x, 
82             cast(int)measure.y
83         );
84     }
85 }