Calculator Demo + Source Code – Fyne GUI Golang tutorial 39
Calculator Demo Source Code – Fyne GUI Golang tutorial 39
Source Code
package main
import (
"fmt"
"image/color"
"strconv"
"fyne.io/fyne/v2"
"fyne.io/fyne/v2/app"
"fyne.io/fyne/v2/canvas"
"fyne.io/fyne/v2/container"
"fyne.io/fyne/v2/widget"
)
func main() {
a := app.New()
w := a.NewWindow("calc")
w.Resize(fyne.NewSize(400, 400))
var val1 int = 0
var val2 int = 0
var symbol string = ""
var total string = ""
var entryText string = ""
entry1 := widget.NewEntry()
entry1.TextStyle = fyne.TextStyle{Bold: true}
entry1.SetPlaceHolder("Calculator..")
btn1 := widget.NewButton("1", func() {
total = total + "1"
entryText = entryText + "1"
entry1.SetText(fmt.Sprint(entryText))
})
btn2 := widget.NewButton("2", func() {
total = total + "2"
entryText = entryText + "2"
entry1.SetText(fmt.Sprint(entryText))
})
btn3 := widget.NewButton("3", func() {
total = total + "3"
entryText = entryText + "3"
entry1.SetText(fmt.Sprint(entryText))
})
btn4 := widget.NewButton("4", func() {
total = total + "4"
entryText = entryText + "4"
entry1.SetText(fmt.Sprint(entryText))
})
btn5 := widget.NewButton("5", func() {
total = total + "5"
entryText = entryText + "5"
entry1.SetText(fmt.Sprint(entryText))
})
btn6 := widget.NewButton("6", func() {
total = total + "6"
entryText = entryText + "6"
entry1.SetText(fmt.Sprint(entryText))
})
btn7 := widget.NewButton("7", func() {
total = total + "7"
entryText = entryText + "7"
entry1.SetText(fmt.Sprint(entryText))
})
btn8 := widget.NewButton("8", func() {
total = total + "8"
entryText = entryText + "8"
entry1.SetText(fmt.Sprint(entryText))
})
btn9 := widget.NewButton("9", func() {
total = total + "9"
entryText = entryText + "9"
entry1.SetText(fmt.Sprint(entryText))
})
btn0 := widget.NewButton("0", func() {
total = total + "0"
entryText = entryText + "0"
entry1.SetText(fmt.Sprint(entryText))
})
btnDot := widget.NewButton(".", func() {
})
result := canvas.NewText("Result", color.Black)
result.TextSize = 30
result.Alignment = fyne.TextAlignCenter
btnClear := widget.NewButton("Clear", func() {
entry1.SetText("")
total = ""
result.Text = ""
entryText = ""
})
// btnClear.Text = "NoClear"
btnPlus := widget.NewButton("+", func() {
val1, _ = strconv.Atoi(total)
fmt.Print(fmt.Sprint(val1))
fmt.Print(fmt.Sprint(val2))
symbol = "+"
fmt.Print(symbol)
entryText = entryText + "+"
entry1.SetText(fmt.Sprint(entryText))
total = ""
})
btnMinus := widget.NewButton("-", func() {
val1, _ = strconv.Atoi(total)
fmt.Print(fmt.Sprint(val1))
fmt.Print(fmt.Sprint(val2))
symbol = "-"
fmt.Print(symbol)
total = ""
entryText = entryText + "-"
entry1.SetText(fmt.Sprint(entryText))
})
btnMultiply := widget.NewButton("x", func() {
val1, _ = strconv.Atoi(total)
fmt.Print(fmt.Sprint(val1))
fmt.Print(fmt.Sprint(val2))
symbol = "*"
fmt.Print(symbol)
total = ""
entryText = entryText + "*"
entry1.SetText(fmt.Sprint(entryText))
})
btnDivide := widget.NewButton("/", func() {
val1, _ = strconv.Atoi(total)
fmt.Print(fmt.Sprint(val1))
fmt.Print(fmt.Sprint(val2))
symbol = "/"
fmt.Print(symbol)
total = ""
entryText = entryText + "/"
entry1.SetText(fmt.Sprint(entryText))
})
btnEqual := widget.NewButton("=", func() {
val2, _ := strconv.Atoi(total)
if symbol == "+" {
myanswer := (val1) + (val2)
fmt.Println("Sum : ", myanswer)
result.Text = fmt.Sprint(myanswer)
result.Refresh()
} else if symbol == "-" {
myanswer := (val1) - (val2)
fmt.Println("Minus : ", myanswer)
result.Text = fmt.Sprint(myanswer)
result.Refresh()
} else if symbol == "*" {
myanswer := (val1) * (val2)
fmt.Println("Multiply : ", myanswer)
result.Text = fmt.Sprint(myanswer)
result.Refresh()
} else {
myanswer := (val1) / (val2)
fmt.Println("divide : ", myanswer)
result.Text = fmt.Sprint(myanswer)
result.Refresh()
}
total = ""
})
w.SetContent(
container.NewVBox(
entry1,
result,
container.NewGridWithColumns(
4,
btn1,
btn2,
btn3,
btn4,
btn5,
btn6,
btn7,
btn8,
btn9,
btn0,
btnDot,
btnEqual,
btnPlus,
btnMinus,
btnMultiply,
btnDivide,
btnClear,
),
),
)
w.ShowAndRun()
}
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