nanogui.label source code

1 ///
2 module nanogui.label;
3 
4 /*
5 	nanogui/label.h -- Text label with an arbitrary font, color, and size
6 
7 	NanoGUI was developed by Wenzel Jakob <wenzel.jakob@epfl.ch>.
8 	The widget drawing code is based on the NanoVG demo application
9 	by Mikko Mononen.
10 
11 	All rights reserved. Use of this source code is governed by a
12 	BSD-style license that can be found in the LICENSE.txt file.
13 */
14 
15 import nanogui.widget;
16 import nanogui.common;
17 import nanogui.theme;
18 
19 /**
20  * Text label widget.
21  *
22  * The font and color can be customized. When `Widget.fixedWidth``
23  * is used, the text is wrapped when it surpasses the specified width.
24  */
25 class Label : Widget 
26 {
27 public:
28 	this(Widget parent, string caption, string font = "sans", int fontSize = -1)
29 	{
30 		super(parent);
31 		mCaption = caption;
32 		mFont = font;
33 		if (mTheme) {
34 			mFontSize = mTheme.mStandardFontSize;
35 			mColor = mTheme.mTextColor;
36 		}
37 		if (fontSize >= 0) mFontSize = fontSize;
38 	}
39 
40 	/// Get the label's text caption
41 	final string caption() const { return mCaption; }
42 	/// Set the label's text caption
43 	final void caption(string caption) { mCaption = caption; }
44 
45 	/// Set the currently active font (2 are available by default: 'sans' and 'sans-bold')
46 	final void font(string font) { mFont = font; }
47 	/// Get the currently active font
48 	final string font() const { return mFont; }
49 
50 	/// Get the label color
51 	final Color color() const { return mColor; }
52 	/// Set the label color
53 	final void color(Color color) { mColor = color; }
54 
55 	/// Set the `Theme` used to draw this widget
56 	override void theme(Theme theme)
57 	{
58 		Widget.theme(theme);
59 		if (mTheme) {
60 			mFontSize = mTheme.mStandardFontSize;
61 			mColor = mTheme.mTextColor;
62 		}
63 	}
64 
65 	/// Compute the size needed to fully display the label
66 	override Vector2i preferredSize(NanoContext ctx) const
67 	{
68 		if (mCaption == "")
69 			return Vector2i();
70 		ctx.fontFace(mFont);
71 		ctx.fontSize(fontSize());
72 		
73 		float[4] bounds;
74 		if (mFixedSize.x > 0) {
75 			NVGTextAlign algn;
76 			algn.left = true;
77 			algn.top = true;
78 			ctx.textAlign(algn);
79 			ctx.textBoxBounds(mPos.x, mPos.y, mFixedSize.x, mCaption, bounds);
80 			return Vector2i(mFixedSize.x, cast(int) (bounds[3] - bounds[1]));
81 		} else {
82 			NVGTextAlign algn;
83 			algn.left = true;
84 			algn.middle = true;
85 			ctx.textAlign(algn);
86 			return Vector2i(
87 				cast(int) ctx.textBounds(0, 0, mCaption, bounds) + 2,
88 				fontSize()
89 			);
90 		}
91 	}
92 
93 	/// Draw the label
94 	override void draw(ref NanoContext ctx)
95 	{
96 		Widget.draw(ctx);
97 		ctx.fontFace(mFont);
98 		ctx.fontSize(fontSize());
99 		ctx.fillColor(mColor);
100 		if (mFixedSize.x > 0)
101 		{
102 			NVGTextAlign algn;
103 			algn.left = true;
104 			algn.top = true;
105 			ctx.textAlign(algn);
106 			ctx.textBox(mPos.x, mPos.y, mFixedSize.x, mCaption);
107 		} else {
108 			NVGTextAlign algn;
109 			algn.left = true;
110 			algn.middle = true;
111 			ctx.textAlign(algn);
112 			ctx.text(mPos.x, mPos.y + mSize.y * 0.5f, mCaption);
113 		}
114 	}
115 
116 	//override void save(Serializer &s) const;
117 	//override bool load(Serializer &s);
118 protected:
119 	string mCaption;
120 	string mFont;
121 	Color mColor;
122 }