TextEditorEdit.replace 是异步的，完成后如何执行代码？答案

【问题标题】：TextEditorEdit.replace is async, how to execute code when it is finished?TextEditorEdit.replace 是异步的，完成后如何执行代码？
【发布时间】：2017-07-12 00:44:13
【问题描述】：

在开发this VS Code extension 时，我不得不将光标移动到我使用vscode.window.activeTextEditor.edit 方法创建的一行，但后来我意识到当我尝试移动光标时该行不存在，所以我必须输入setTimeout 才能尝试移动光标：

let editor: TextEditor = vscode.window.activeTextEditor;
let selections: Selection[] = editor.selections;
let doc: TextDocument = editor.document;

editor.edit(function (edit: TextEditorEdit): void {
    selections.forEach((selection: Selection, index: number) => {
        for (let i = selection.start.line; i <= selection.end.line; i++) {
            let selLine: TextLine = doc.lineAt(i);
            let insertPos: Range = selLine.range;
            let insertLineText: string = selLine.text;

            // This is async :(
            edit.replace(insertPos, insertSemicolon(insertLineText, newLine));
        }
    });

    if (newLine) {
        // Move cursor to the next line
        setTimeout(() => {
            vscode.commands.executeCommand("cursorMove", {
                to: "down",
                by: "wrappedLine",
                select: false,
                value: 1
            }).then(() => {
                vscode.commands.executeCommand("cursorMove", {
                    to: "wrappedLineEnd",
                    by: "wrappedLine",
                    select: false
                })
            });
        }, 50);
    }
});

我知道这不是一个好习惯，因为我不能确定代码执行时该行是否存在，我试图找到一种方法来仅在编辑完成时执行此代码替换一切。

【问题讨论】：

标签： visual-studio-code vscode-extensions

【解决方案1】：

您需要将光标操作移到编辑块之外。 TextEditor.edit 中的回调建立了一组编辑，然后异步应用这些编辑。 edit 返回一个Thenable<boolean> 以指示编辑是否成功完成。

尝试类似：

let editor: TextEditor = vscode.window.activeTextEditor;
let selections: Selection[] = editor.selections;
let doc: TextDocument = editor.document;

editor.edit(function (edit: TextEditorEdit): void {
    selections.forEach((selection: Selection, index: number) => {
        for (let i = selection.start.line; i <= selection.end.line; i++) {
            let selLine: TextLine = doc.lineAt(i);
            let insertPos: Range = selLine.range;
            let insertLineText: string = selLine.text;

            edit.replace(insertPos, insertSemicolon(insertLineText, newLine));
        }
    });
}).then(success => {
    if (!success) {
        return
    }
     if (newLine) {
        // Move cursor to the next line
        ...
    }
})

【讨论】：