Factor common code from Editor{Node,Label} into EditorInputBase

Fixes #5

EditorInputBase.js

@@ -0,0 +1,107 @@
+class EditorInputBase extends EditorEntryBase {
+  constructor(id, label) {
+    super(id);
+
+    this.input_ = document.createElement('input');
+    this.input_.type = 'text';
+    this.listen(this.input_, 'keydown', (e) => this.onInputKeyDown(e));
+    this.listen(this.input_, 'input', (e) => this.onInput(e));
+    this.listen(this.input_, 'blur', (e) => this.onBlur(e));
+    this.elem_.appendChild(this.input_);
+
+    this.lastSnapshotLabel_ = '';
+
+    if (label) {
+      this.setLabel(label);
+    }
+  }
+
+  afterDomAdd() {
+    this.input_.focus();
+  }
+
+  serialize(base) {
+    base.id = this.getId();
+    base.label = this.getLabel();
+    return base;
+  }
+
+  getLabel() {
+    return this.input_.value;
+  }
+
+  setLabel(label) {
+    this.input_.value = label;
+    this.lastSnapshotLabel_ = label;
+    this.onInput();
+  }
+
+  wantFocus() {
+    return this.getLabel() == '';
+  }
+
+  onInput() {
+    this.elem_.setAttribute('data-arch-refresh', '');
+  }
+
+  onBlur() {
+    if (this.getLabel() != this.lastSnapshotLabel_) {
+      this.lastSnapshotLabel_ = this.getLabel();
+      this.elem_.setAttribute('data-arch-snapshot', '');
+    }
+  }
+
+  onInputKeyDown(e) {
+    switch (e.key) {
+      case 'Enter':
+        e.preventDefault();
+        e.stopPropagation();
+        if (this.elem_.nextElementSibling &&
+            this.elem_.nextElementSibling.xArchObj &&
+            this.elem_.nextElementSibling.xArchObj.wantFocus()) {
+          this.elem_.nextElementSibling.xArchObj.startEdit();
+        } else {
+          this.stopEdit();
+        }
+        break;
+
+      case 'Escape':
+      case '`':
+        e.preventDefault();
+        e.stopPropagation();
+        this.stopEdit();
+        break;
+
+      case 'ArrowUp':
+      case 'ArrowDown':
+      case 'PageUp':
+      case 'PageDown':
+        this.stopEdit();
+        break;
+
+      default:
+        e.stopPropagation();
+        break;
+    }
+  }
+
+  onKeyDown(e) {
+    super.onKeyDown(e);
+
+    switch (e.key) {
+      case 'Enter':
+        this.startEdit();
+        e.stopPropagation();
+        e.preventDefault();
+        break;
+    }
+  }
+
+  startEdit() {
+    this.input_.focus();
+  }
+
+  stopEdit() {
+    this.elem_.focus();
+  }
+}