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, 60 insertions, 0 deletions

diff --git a/ui/dialogs/CancelDialog.js b/ui/dialogs/CancelDialog.js
new file mode 100644
index 0000000..9069d43
--- /dev/null
+++ b/ui/dialogs/CancelDialog.js
@@ -0,0 +1,60 @@
+import {Button, Form} from 'tui-lib/ui/controls'
+import {Label, Pane} from 'tui-lib/ui/presentation'
+import {FocusElement} from 'tui-lib/ui/primitives'
+
+import telc from 'tui-lib/util/telchars'
+
+export default class CancelDialog extends FocusElement {
+  // A basic cancel dialog. Has one buttons, cancel, and a label.
+  // The escape (esc) key can be used to exit the dialog (which sends a
+  // 'cancelled' event, as the cancel button also does).
+
+  constructor(text) {
+    super()
+
+    this.pane = new Pane()
+    this.addChild(this.pane)
+
+    this.cancelBtn = new Button('Cancel')
+    this.pane.addChild(this.cancelBtn)
+
+    this.label = new Label(text)
+    this.pane.addChild(this.label)
+
+    this.initEventListeners()
+  }
+
+  initEventListeners() {
+    this.cancelBtn.on('pressed', () => this.cancelPressed())
+  }
+
+  fixLayout() {
+    this.w = this.parent.contentW
+    this.h = this.parent.contentH
+
+    this.pane.w = Math.max(40, 4 + this.label.w)
+    this.pane.h = 7
+    this.pane.centerInParent()
+
+    this.label.x = Math.floor((this.pane.contentW - this.label.w) / 2)
+    this.label.y = 1
+
+    this.cancelBtn.x = Math.floor(
+      (this.pane.contentW - this.cancelBtn.w) / 2)
+    this.cancelBtn.y = this.pane.contentH - 2
+  }
+
+  selected() {
+    this.root.select(this.cancelBtn)
+  }
+
+  keyPressed(keyBuf) {
+    if (telc.isCancel(keyBuf)) {
+      this.emit('cancelled')
+    }
+  }
+
+  cancelPressed() {
+    this.emit('cancelled')
+  }
+}