editor: add handler to save the content

When user press CTRL+S on the editor, it will trigger the OnSave handler.

While at it,

  * auto scroll when pressing arrow up or down
  * auto scroll to bottom when pressing Enter at the end of file
  * fix tab key not inserting tab characters

1 files changed, 2 insertions, 1 deletions

diff --git a/editor/editor.d.ts b/editor/editor.d.ts
index c5a8a88..d0023df 100644
--- a/editor/editor.d.ts
+++ b/editor/editor.d.ts
@@ -4,6 +4,7 @@ export interface IEditor {
     is_editable: boolean;
     OpenFile(path: string): Response;
     OnSelection(begin: number, end: number): void;
+    OnSave(content: string): void;
 }
 export declare class Editor {
     opts: IEditor;
@@ -36,7 +37,7 @@ export declare class Editor {
     insertNewline(x: number, text: string): void;
     onClickText(text: HTMLElement): void;
     onKeyup(x: number, text: HTMLElement, ev: KeyboardEvent): boolean | undefined;
-    onKeydown(x: number, elText: HTMLElement, ev: KeyboardEvent): void;
+    onKeydown(x: number, elText: HTMLElement, ev: KeyboardEvent): false | undefined;
     onMouseDownAtLine(x: number): void;
     onMouseUpAtLine(x: number): void;
     render(): void;