use ESM module syntax & minor cleanups

The biggest change here is moving various element classes under
more scope-specific directories, which helps to avoid circular
dependencies and is just cleaner to navigate and expand in the
future.

Otherwise this is a largely uncritical port to ESM module syntax!
There are probably a number of changes and other cleanups that
remain much needed.

Whenever I make changes to tui-lib it's hard to believe it's
already been <INSERT COUNTING NUMBER HERE> years since the
previous time. First commits are from January 2017, and the
code originates a month earlier in KAaRMNoD!

1 files changed, 0 insertions, 56 deletions

diff --git a/ui/Dialog.js b/ui/Dialog.js
deleted file mode 100644
index 0b77b12..0000000
--- a/ui/Dialog.js
+++ /dev/null
@@ -1,56 +0,0 @@
-const FocusElement = require('./form/FocusElement')
-
-const Pane = require('./Pane')
-
-const telc = require('../util/telchars')
-
-module.exports = class Dialog extends FocusElement {
-  // A simple base dialog.
-  //
-  // Emits the 'cancelled' event when the cancel key (escape) is pressed,
-  // which should (probably) be handled by the dialog's creator.
-  //
-  // Doesn't do anything when focused by default - this should be overridden
-  // in subclasses.
-  //
-  // Automatically adjusts to fill its parent. Has a pane child (this.pane),
-  // but the pane isn't adjusted at all (you should change its size and
-  // likely center it in your subclass).
-
-  constructor() {
-    super()
-
-    this.pane = new Pane()
-    this.addChild(this.pane)
-  }
-
-  fixLayout() {
-    this.w = this.parent.contentW
-    this.h = this.parent.contentH
-  }
-
-  open() {
-    this.oldSelectedElement = this.root.selectedElement
-    this.opened()
-    this.visible = true
-    this.root.select(this)
-    this.fixLayout()
-  }
-
-  close() {
-    this.closed()
-    this.visible = false
-    this.root.select(this.oldSelectedElement)
-  }
-
-  opened() {}
-
-  closed() {}
-
-  keyPressed(keyBuf) {
-    if (telc.isCancel(keyBuf)) {
-      this.emit('cancelled')
-      return false
-    }
-  }
-}