w4d.widget.popup.base source code

1 // Written in the D programming language.
2 /++
3  + Authors: KanzakiKino
4  + Copyright: KanzakiKino 2018
5  + License: LGPL-3.0
6 ++/
7 module w4d.widget.popup.base;
8 import w4d.widget.base,
9        w4d.widget.panel,
10        w4d.widget.root,
11        w4d.exception;
12 import gl3n.linalg;
13 
14 /// A base widget of popup.
15 class PopupWidget : RootWidget
16 {
17     /// WindowContext of the popup target.
18     protected WindowContext _objectContext;
19 
20     protected vec2 _pos, _size;
21 
22     ///
23     override void handlePopup ( bool opened, WindowContext w )
24     {
25         if ( opened ) {
26             _objectContext = w;
27         } else {
28             _objectContext.requestRedraw();
29             _objectContext = null;
30         }
31     }
32 
33     ///
34     this ()
35     {
36         super();
37         _objectContext = null;
38 
39         _pos  = vec2(0,0);
40         _size = vec2(0,0);
41     }
42 
43     /// Moves the popup to the pos and resize to the size.
44     void move ( vec2 pos, vec2 size )
45     {
46         _pos  = pos;
47         _size = size;
48         requestLayout();
49     }
50     /// Closes the popup.
51     void close ()
52     {
53         enforce( _objectContext,
54                 "The popup is not opened yet." );
55         _objectContext.setPopup( null );
56     }
57 
58     ///
59     override vec2 layout ( vec2 rootlt, vec2 rootsz )
60     {
61         .Widget.layout( _pos, _size );
62 
63         const rootrb = rootlt + rootsz;
64 
65         const lt = style.translate;
66         const rb = lt + style.box.collisionSize;
67 
68         auto late = vec2(0,0);
69         if ( lt.x < rootlt.x ) {
70             late.x = rootlt.x - lt.x;
71         } else if ( rb.x > rootrb.x ) {
72             late.x = rootrb.x - rb.x;
73         }
74         if ( lt.y < rootlt.y ) {
75             late.y = rootlt.y - lt.y;
76         } else if ( rb.y > rootrb.y ) {
77             late.y = rootrb.y - rb.y;
78         }
79 
80         style.shift( late );
81         shiftChildren( late );
82         return vec2(0,0);
83     }
84 }