1 files changed, 101 insertions, 0 deletions
diff --git a/ui/presentation/Pane.js b/ui/presentation/Pane.js
new file mode 100644
index 0000000..4769cf9
--- /dev/null
+++ b/ui/presentation/Pane.js
@@ -0,0 +1,101 @@
+import {DisplayElement} from 'tui-lib/ui/primitives'
+
+import * as ansi from 'tui-lib/util/ansi'
+import unic from 'tui-lib/util/unichars'
+
+import Label from './Label.js'
+
+export default class Pane extends DisplayElement {
+  // A simple rectangular framed pane.
+
+  constructor() {
+    super()
+
+    this.frameColor = null
+
+    this.hPadding = 1
+    this.vPadding = 1
+  }
+
+  drawTo(writable) {
+    this.drawFrame(writable)
+    super.drawTo(writable)
+  }
+
+  drawFrame(writable, debug=false) {
+    writable.write(ansi.setForeground(this.frameColor))
+
+    const left = this.absLeft
+    const right = this.absRight
+    const top = this.absTop
+    const bottom = this.absBottom
+
+    // Background
+    // (TODO) Transparent background (that dimmed everything behind it) would
+    // be cool at some point!
+    for (let y = top + 1; y <= bottom - 1; y++) {
+      writable.write(ansi.moveCursor(y, left))
+      writable.write(' '.repeat(this.w))
+    }
+
+    // Left/right edges
+    for (let x = left + 1; x <= right - 1; x++) {
+      writable.write(ansi.moveCursor(top, x))
+      writable.write(unic.BOX_H)
+      writable.write(ansi.moveCursor(bottom, x))
+      writable.write(unic.BOX_H)
+    }
+
+    // Top/bottom edges
+    for (let y = top + 1; y <= bottom - 1; y++) {
+      writable.write(ansi.moveCursor(y, left))
+      writable.write(unic.BOX_V)
+      writable.write(ansi.moveCursor(y, right))
+      writable.write(unic.BOX_V)
+    }
+
+    // Corners
+    writable.write(ansi.moveCursor(top, left))
+    writable.write(unic.BOX_CORNER_TL)
+    writable.write(ansi.moveCursor(top, right))
+    writable.write(unic.BOX_CORNER_TR)
+    writable.write(ansi.moveCursor(bottom, left))
+    writable.write(unic.BOX_CORNER_BL)
+    writable.write(ansi.moveCursor(bottom, right))
+    writable.write(unic.BOX_CORNER_BR)
+
+    // Debug info
+    if (debug) {
+      writable.write(ansi.moveCursor(6, 8))
+      writable.write(
+        `x: ${this.x}; y: ${this.y}; w: ${this.w}; h: ${this.h}`)
+      writable.write(ansi.moveCursor(7, 8))
+      writable.write(`AbsX: ${this.absX}; AbsY: ${this.absY}`)
+      writable.write(ansi.moveCursor(8, 8))
+      writable.write(`Left: ${this.left}; Right: ${this.right}`)
+      writable.write(ansi.moveCursor(9, 8))
+      writable.write(`Top: ${this.top}; Bottom: ${this.bottom}`)
+    }
+
+    writable.write(ansi.setForeground(ansi.C_RESET))
+  }
+
+  static alert(parent, text) {
+    // Show an alert pane in the bottom left of the given parent element for
+    // a couple seconds.
+
+    const pane = new Pane()
+    pane.frameColor = ansi.C_WHITE
+    pane.w = ansi.measureColumns(text) + 2
+    pane.h = 3
+    parent.addChild(pane)
+
+    const label = new Label(text)
+    label.textAttributes = [ansi.C_WHITE]
+    pane.addChild(label)
+
+    setTimeout(() => {
+      parent.removeChild(pane)
+    }, 2000)
+  }
+}