golang close window

In Go language programming, closing a window may be a common task. For GUI applications, when the user clicks the close button, we need to capture the event in the program and perform corresponding operations, such as saving data, confirming closure, etc. In this article, we will discuss how to close a window in Go language.

First, we need to use some GUI libraries to create windows and handle events. Currently, the most popular GUI libraries in the Go language include fyne, gotk3, qt, etc. We will use the fyne library as an example. Fyne is a modern Go-based GUI framework for building desktop and mobile applications that is easy to use, efficient and cross-platform. Before starting, please make sure you have installed the fyne library. You can install it in the terminal using the following command:

go get fyne.io/fyne

Create window

Before using the fyne library, we need to understand its basics. Knowledge. In fyne, each application has an App object, which is the core object in the application. An application called "Hello World" can be created using the following command:

app := fyne.NewApp("Hello World")

Next, we need to create a window object. A window can be created using the following command:

win := app.NewWindow("My Window")

This will create a window named "My Window". Now we can add some content to the window. For example, we can add a label component as the title of the window:

title := widget.NewLabel("My Window")
win.SetTitleBar(widget.NewVBox(title))

GUI applications are event-driven, and fyne is no exception. Next, we need to add a close event handler for the window.

Capture the close event

In the fyne library, we can add a CloseRequest event handler for each window. This event is fired when the user clicks the close button. We can add the CloseRequest event handler using the following code:

win.SetOnClosed(func() {
    fmt.Println("Window closed")
})

When the user clicks the close button, the callback function will be executed, and we can perform some necessary operations here, such as saving data, closing the network connection, etc. . In this example, we just print a message to the console: "Window closed".

The complete code is as follows:

package main

import (
    "fmt"
    "fyne.io/fyne"
    "fyne.io/fyne/widget"
)

func main() {
    // 创建应用程序
    app := fyne.NewApp("Hello World")

    // 创建窗口
    win := app.NewWindow("My Window")

    // 添加标题
    title := widget.NewLabel("My Window")
    win.SetTitleBar(widget.NewVBox(title))

    // 添加CloseRequest事件处理程序
    win.SetOnClosed(func() {
        fmt.Println("Window closed")
    })

    // 显示窗口
    win.ShowAndRun()
}

When this program is run, a window named "My Window" will be displayed. When the Close button is clicked, a message "Window closed" is output to the console.

Conclusion

This article introduces how to close the window in Go language. We created a GUI application using the fyne library and added a CloseRequest event handler to the window. When the user clicks on the close button, the callback function is executed in which we can perform some necessary operations. By mastering these basics, we can build more complex GUI applications.

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