editor: allow inserting tab on editor

Previously pressing tab on editor will move focus to the next
component on page or browser.
Now, pressing tab will insert "\t" on the current cursor.

1 files changed, 27 insertions, 0 deletions

diff --git a/editor/editor.js b/editor/editor.js
index e80e147..090b7fe 100644
--- a/editor/editor.js
+++ b/editor/editor.js
@@ -11,6 +11,7 @@ export class WuiEditor {
         this.elLineNumber = document.createElement("div");
         this.elContent = document.createElement("div");
         this.isKeyControl = false;
+        this.isKeyShift = false;
         this.id = opts.id;
         this.isEditable = opts.isEditable;
         const el = document.getElementById(opts.id);
@@ -102,6 +103,7 @@ export class WuiEditor {
             };
             this.elContent.addEventListener("blur", () => {
                 this.isKeyControl = false;
+                this.isKeyShift = false;
             });
         }
         this.elContent.classList.add(WUI_EDITOR_CLASS_CONTENT);
@@ -146,6 +148,16 @@ export class WuiEditor {
     `;
         document.head.appendChild(style);
     }
+    insert(text) {
+        const selection = window.getSelection();
+        if (!selection || !selection.rangeCount) {
+            console.error(`insert: failed to get selection`);
+            return;
+        }
+        selection.deleteFromDocument();
+        selection.getRangeAt(0).insertNode(document.createTextNode(text));
+        selection.collapseToEnd();
+    }
     onKeydownDocument(ed, ev) {
         switch (ev.key) {
             case "Control":
@@ -164,6 +176,18 @@ export class WuiEditor {
                 }
                 this.addNewLine();
                 return false;
+            case "Shift":
+                ed.isKeyShift = true;
+                break;
+            case "Tab":
+                if (ed.isKeyShift) {
+                    // Pressing Shift+Tab should move focus out of editor,
+                    // which focus to the previous component on the page or browser.
+                    return true;
+                }
+                ev.preventDefault();
+                this.insert("\t");
+                return false;
         }
         return true;
     }
@@ -172,6 +196,9 @@ export class WuiEditor {
             case "Control":
                 ed.isKeyControl = false;
                 return true;
+            case "Shift":
+                ed.isKeyShift = false;
+                break;
         }
         return true;
     }