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comparison src/name/blackcap/clipman/Misc.kt @ 27:8aa2dfac27eb

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Big reorg; compiled but untested.
author David Barts <n5jrn@me.com>
date Wed, 29 Jan 2020 10:50:07 -0800
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children 0c6c18a733b7
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26:ff35fabaea3a 27:8aa2dfac27eb
1 /*
2 * Miscellaneous utility stuff.
3 */
4 package name.blackcap.clipman
5
6 import java.awt.Dimension
7 import java.awt.Toolkit
8 import javax.swing.*
9 import javax.swing.text.JTextComponent
10
11 /**
12 * Allows a val to have lateinit functionality. It is an error to attempt
13 * to retrieve this object's value unless it has been set, and it is an
14 * error to attempt to set the value of an already-set object.
15 * @param &lt;T&gt; type of the associated value
16 */
17 class LateInit<T> {
18 private var _v: T? = null
19
20 /**
21 * The value associated with this object. The name of this property is
22 * deliberately short.
23 */
24 var v: T
25 get() {
26 if (_v == null) {
27 throw IllegalStateException("cannot retrieve un-initialized value")
28 } else {
29 return _v!!
30 }
31 }
32 @Synchronized set(value) {
33 if (_v != null) {
34 throw IllegalStateException("cannot set already-initialized value")
35 }
36 _v = value
37 }
38 }
39
40 /**
41 * Run something in the Swing thread, asynchronously.
42 * @param block lambda containing code to run
43 */
44 fun inSwingThread(block: () -> Unit) {
45 SwingUtilities.invokeLater(Runnable(block))
46 }
47
48 /**
49 * Run something in the Swing thread, synchronously.
50 * @param block lambda containing code to run
51 */
52 fun inSynSwingThread(block: () -> Unit) {
53 SwingUtilities.invokeAndWait(Runnable(block))
54 }
55
56 /**
57 * Autosize a JTextComponent to a given width.
58 * @param width the width
59 */
60 fun JTextComponent.autoSize(width: Int): Unit {
61 val SLOP = 10
62 val dim = Dimension(width, width)
63 preferredSize = dim
64 size = dim
65 val r = modelToView(document.length)
66 preferredSize = Dimension(width, r.y + r.height + SLOP)
67 }
68
69 /**
70 * Make a shortcut for a menu item, using the standard combining key
71 * (control, command, etc.) for the system we're on.
72 * @param key KeyEvent constant describing the key
73 */
74 fun JMenuItem.makeShortcut(key: Int): Unit {
75 val SC_KEY_MASK = Toolkit.getDefaultToolkit().menuShortcutKeyMask
76 setAccelerator(KeyStroke.getKeyStroke(key, SC_KEY_MASK))
77 }
78
79 /**
80 * Given a MenuElement object, get the item whose text matches the
81 * specified text.
82 * @param text to match
83 * @return first matched element, null if no match found
84 */
85 fun MenuElement.getItem(name: String) : JMenuItem? {
86 subElements.forEach {
87 val jMenuItem = it.component as? JMenuItem
88 if (jMenuItem?.text == name) {
89 return jMenuItem
90 }
91 }
92 return null
93 }
94