w4d.widget.panel 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.panel;
8 import w4d.layout.lineup,
9        w4d.widget.base,
10        w4d.exception;
11 import gl3n.linalg;
12 import std.algorithm;
13 
14 /// A widget of panel.
15 /// PanelWidget can have children.
16 class PanelWidget : Widget
17 {
18     protected Widget[] _children;
19     ///
20     override @property Widget[] children ()
21     {
22         return _children.dup;
23     }
24 
25     ///
26     this ()
27     {
28         super();
29         setLayout!VerticalLineupLayout;
30     }
31 
32     /// Adds the child.
33     Widget addChild ( Widget child )
34     {
35         enforce( child, "Append child is null." );
36         _children ~= child;
37         requestLayout();
38         return child;
39     }
40     /// Swaps the children.
41     void swapChild ( Widget c1, Widget c2 )
42     {
43         auto i1 = _children.countUntil!"a is b"(c1);
44         auto i2 = _children.countUntil!"a is b"(c2);
45         enforce( i1 >= 0 && i2 >= 0, "The children are unknown." );
46         _children.swapAt( i1, i2 );
47         requestLayout();
48     }
49     /// Removes all children.
50     void removeAllChildren ()
51     {
52         _children.each!( x => _context.forget(x) );
53         _children = [];
54         requestLayout();
55     }
56     /// Removes the child.
57     void removeChild ( Widget child )
58     {
59         _context.forget( child );
60         _children = _children.remove!( x => x is child );
61         requestLayout();
62     }
63 
64     protected static template DisableModifyChildren ()
65     {
66         import w4d.widget.base: Widget;
67         import w4d.exception: W4dException;
68 
69         enum DisableModifyChildren_ErrorMes = "Modifying children is not allowed.";
70 
71         override Widget addChild ( Widget )
72         {
73             throw new W4dException( DisableModifyChildren_ErrorMes );
74         }
75         override void swapChild ( Widget, Widget )
76         {
77             throw new W4dException( DisableModifyChildren_ErrorMes );
78         }
79         override void removeChild ( Widget )
80         {
81             throw new W4dException( DisableModifyChildren_ErrorMes );
82         }
83         override void removeAllChildren ()
84         {
85             throw new W4dException( DisableModifyChildren_ErrorMes );
86         }
87     }
88 
89     ///
90     override @property bool trackable () { return false; }
91     ///
92     override @property bool focusable () { return false; }
93 }