golang window wait to close

When writing GUI applications in golang, we often need to wait for the user to close the window to proceed with the next step. This article will introduce how to wait for the window to close in golang.

1. Use channel to implement waiting

In golang, channel is a data structure used for communication between goroutines. We can use channels to wait for the window to close.

First, we need to create a channel to receive closing events. Then, when the window close event occurs, we send the event to the channel and wait in the main goroutine for the channel to receive the event.

The following is the sample code:

package main

import (
    "fmt"
    "github.com/andlabs/ui"
)

func main() {
    // 创建一个channel，用于接收关闭事件
    done := make(chan struct{})

    // 创建窗口
    window := ui.NewWindow("Golang窗口等待关闭示例", 200, 100, false)

    // 处理窗口关闭事件
    window.OnClosing(func(*ui.Window) bool {
        close(done) // 发送关闭事件到通道
        return true // 关闭窗口
    })

    // 显示窗口
    window.Show()

    // 等待关闭事件
    <-done

    fmt.Println("窗口已关闭")
}

In the above code, we used the andlabs/ui package to create the window. When the window is closed, we send the close event to the channel and wait in the main goroutine for the channel to receive the event.

2. Use sync.WaitGroup to wait

In addition to using channel to wait, we can also use WaitGroup in the sync package to wait for the window to close.

WaitGroup is a counting semaphore used to wait for the end of a group of goroutines. We can use the Add method to increment the counter, the Done method to decrement the counter, and the Wait method to wait for the counter to reach zero.

The following is a sample code:

package main

import (
    "fmt"
    "github.com/andlabs/ui"
    "sync"
)

func main() {
    // 创建WaitGroup
    var wg sync.WaitGroup
    wg.Add(1)

    // 创建窗口
    window := ui.NewWindow("Golang窗口等待关闭示例", 200, 100, false)

    // 处理窗口关闭事件
    window.OnClosing(func(*ui.Window) bool {
        wg.Done() // 减少计数器
        return true // 关闭窗口
    })

    // 显示窗口
    window.Show()

    // 等待关闭事件
    wg.Wait()

    fmt.Println("窗口已关闭")
}

In the above code, we use sync.WaitGroup to wait for the window to close. First, we create a WaitGroup and increment the counter. When the window is closed, we call the Done method to decrement the counter. Finally, we call the Wait method to wait for the counter to reach zero.

Summary

When writing GUI applications in golang, waiting for the window to close is a common requirement. We can use channel or WaitGroup to implement waiting. Using channels to implement waiting is more flexible and can be used in multiple goroutines, but you need to wait for events in the main goroutine. It is relatively simple to use WaitGroup to implement waiting, but you need to ensure that the counter is used correctly. Either way, we need to send a close event in the window close event to notify the main goroutine.

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