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GoVCL

Cross-platform Golang GUI library, The core binding is liblcl, a common cross-platform GUI library created by Lazarus.

GoVCL is a native GUI library, not based on HTML, let alone DirectUI library, everything is practical.

Full name: Go Language Visual Component Library

govcl minimum requirement is go1.9.2.

Screenshots | WIKI(Chinese) | What's-new(Chinese) | Video tutorial(Unofficial) | Sponsor govcl

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Support Platform

Windows | Linux | macOS

If you want to support linux arm and linux 32bit, you need to compile the corresponding liblcl binary.

Pre-compiled GUI library binary download (source code)

res2go IDE plugin source code（source code）

How to use: Installation method

Note: Designed in Lazarus, code written in Golang.

usage:

Step 1: Get the govcl code

go get -u github.com/ying32/govcl

Note: You can also use go module mode, configure in go.mod, such as: github.com/ying32/govcl v2.2.0+incompatible.

Step 2: Write the code

• Method 1(Use Lazarus to design the GUI. recommend):

package main


import (
   // Do not reference this package if you use custom syso files
   _ "github.com/ying32/govcl/pkgs/winappres"
   "github.com/ying32/govcl/vcl"
)

type TMainForm struct {
    *vcl.TForm
    Btn1     *vcl.TButton
}

type TAboutForm struct {
    *vcl.TForm
    Btn1    *vcl.TButton
}

var (
    mainForm *TMainForm
    aboutForm *TAboutForm
)

func main() {
    vcl.Application.Initialize()
    vcl.Application.SetMainFormOnTaskBar(true)
    vcl.Application.CreateForm(&mainForm)
    vcl.Application.CreateForm(&aboutForm)
    vcl.Application.Run()
}

// -- TMainForm

func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
    
}

func (f *TMainForm) OnBtn1Click(sender vcl.IObject) {
    aboutForm.Show()
}

// -- TAboutForm

func (f *TAboutForm) OnFormCreate(sender vcl.IObject) {
 
}

func (f *TAboutForm) OnBtn1Click(sender vcl.IObject) {
    vcl.ShowMessage("Hello!")
}

Method 1 needs to be used in conjunction with the res2go tool.

• Method 2(Pure code, imitating the way of FreePascal class):

package main


import (
   // Do not reference this package if you use custom syso files
   _ "github.com/ying32/govcl/pkgs/winappres"
   "github.com/ying32/govcl/vcl"
)

type TMainForm struct {
    *vcl.TForm
    Btn1     *vcl.TButton
}

type TAboutForm struct {
    *vcl.TForm
    Btn1    *vcl.TButton
}

var (
    mainForm *TMainForm
    aboutForm *TAboutForm
)

func main() {
    vcl.RunApp(&mainForm, &aboutForm)
}

// -- TMainForm

func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
    f.SetCaption("MainForm")
    f.Btn1 = vcl.NewButton(f)
    f.Btn1.SetParent(f)
    f.Btn1.SetBounds(10, 10, 88, 28)
    f.Btn1.SetCaption("Button1")
    f.Btn1.SetOnClick(f.OnBtn1Click)  
}

func (f *TMainForm) OnBtn1Click(sender vcl.IObject) {
    aboutForm.Show()
}


// -- TAboutForm

func (f *TAboutForm) OnFormCreate(sender vcl.IObject) {
    f.SetCaption("About")
    f.Btn1 = vcl.NewButton(f)
    //f.Btn1.SetName("Btn1")
    f.Btn1.SetParent(f)
    f.Btn1.SetBounds(10, 10, 88, 28)
    f.Btn1.SetCaption("Button1")
    f.Btn1.SetOnClick(f.OnBtn1Click)  
}

func (f *TAboutForm) OnBtn1Click(sender vcl.IObject) {
    vcl.ShowMessage("Hello!")
}

Step 3: Copy the corresponding binary

• Windows: Depending on whether the compiled binary is 32 or 64 bits, copy the corresponding liblcl.dll to the current executable file directory or system environment path.

  • Go environment variable: GOARCH = amd64 386 GOOS = windows CGO_ENABLED=0

• Linux: Copy liblcl.so under the current executable file directory (you can also copy liblcl.so to /usr/lib/ (32bit liblcl) or /usr/lib/x86_64-linux-gnu/ (64bit liblcl) directory , Used as a public library).

  • Go environment variable: GOARCH = amd64 GOOS = linux CGO_ENABLED=1

• MacOS: Copy liblcl.dylib to the current executable file directory (note under MacOS: you need to create info.plist file yourself), or refer to: App packaging on MacOS

  • Go environment variable: GOARCH = amd64 GOOS = darwin CGO_ENABLED=1

Note: The "current executable file directory" here refers to the location of the executable file generated by your currently compiled project.

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Special Note: All UI components are non-threaded/non-coroutine safe. When used in goroutine, use vcl.ThreadSync to synchronize updates to the UI.

Special Note 2: If you use go>=1.15 to compile Windows executable files, you must use the -buildmode=exe compilation option, otherwise there will be errors.

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FAQ

Q: Why is there no English WIKI?
A: My English is bad. You can try using Google Translate Chinese WIKI.

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API document

• Lazarus LCL component WIKI
• Windows API document

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Thanks jetbrains