electron 顯示對話框 showMessageBoxSync showMessageBox

7.3.2的文檔：https://github.com/electron/electron/blob/v7.3.2/docs/api/dialog.md 不同版本可以切換

一個是同步對話框，另外一個是異步。

同步：

//will-prevent-unload這個事件隻會在彈出框關閉時觸發，比如alert，confirm      

win.webContents.on('will-prevent-unload', (event) => {      

console.log(" ==cust_event_notify_dialog_confirm==");
    const options = {
        type: 'question',
        buttons: ['Cancel', 'Yes, please', 'No, thanks'],
        defaultId: 2,
        cancelId: 0,
        title: 'Question',
        message: 'my window?',
        detail: 'It does not really matter',
        checkboxLabel: 'remember',
        checkboxChecked: true,
    }; 
  
  const choice= dialog.showMessageBoxSync(win, options);
   const isCancel = (choice === 0)
   
  if (!isCancel) {
    event.preventDefault()//确認
  }  
})      

異步：

// 視窗關閉
win.on('close', (e) => {
        e.preventDefault();
        dialog.showMessageBox(win, {
            type: 'warning',
            title: '關閉',
            message: '是否退出？',
            buttons: ['取消', '确定']
        }).then((index) => {
            if (index.response === 1) {
                win = null;
                app.exit();
            }
        });
});