atelier.ui.layout.vlayout source code

1 /** 
2  * Copyright: Enalye
3  * License: Zlib
4  * Authors: Enalye
5  */
6 module atelier.ui.layout.vlayout;
7 
8 import std.conv : to;
9 import std.algorithm.comparison : max;
10 import atelier.render, atelier.core, atelier.common;
11 import atelier.ui.gui_element;
12 
13 /// Resize children to fit and align them vertically.
14 class VLayout : GuiElement {
15     private {
16         Vec2f _spacing = Vec2f.zero;
17         uint _capacity;
18     }
19 
20     @property {
21         Vec2f spacing() const {
22             return _spacing;
23         }
24 
25         Vec2f spacing(Vec2f newPadding) {
26             _spacing = newPadding;
27             resize();
28             return _spacing;
29         }
30 
31         uint capacity() const {
32             return _capacity;
33         }
34 
35         uint capacity(uint newCapacity) {
36             _capacity = newCapacity;
37             resize();
38             return _capacity;
39         }
40     }
41 
42     /// Ctor
43     this() {
44     }
45 
46     /// Ctor
47     this(Vec2f newSize) {
48         size = newSize;
49     }
50 
51     override void appendChild(GuiElement gui) {
52         gui.setAlign(GuiAlignX.left, GuiAlignY.top);
53         super.appendChild(gui);
54         resize();
55     }
56 
57     override void onSize() {
58         resize();
59     }
60 
61     protected void resize() {
62         if (!_children.length)
63             return;
64         const Vec2f childSize = Vec2f(size.x, size.y / (_capacity != 0u
65                 ? _capacity : _children.length));
66         foreach (size_t id, GuiElement gui; _children) {
67             gui.position = origin + Vec2f(0f, childSize.y * to!float(id));
68             gui.size = childSize - _spacing;
69         }
70     }
71 }