docs.sheetjs.com/docz/static/wails/app.go

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2022-08-31 06:46:03 +00:00
package main
import (
"context"
"encoding/base64"
"fmt"
"github.com/wailsapp/wails/v2/pkg/runtime"
"io/ioutil"
)
// App struct
type App struct {
ctx context.Context
}
// NewApp creates a new App application struct
func NewApp() *App {
return &App{}
}
// startup is called when the app starts. The context is saved
// so we can call the runtime methods
func (a *App) startup(ctx context.Context) {
a.ctx = ctx
}
// Greet returns a greeting for the given name
func (a *App) Greet(name string) string {
return fmt.Sprintf("Hello %s, It's show time!", name)
}
// ShowError displays an error message in a desktop dialog.
func (a *App) ShowError(title string, message string) {
_, _ = runtime.MessageDialog(a.ctx, runtime.MessageDialogOptions{
Type: runtime.ErrorDialog,
Title: title,
Message: message,
})
}
// ShowInfo displays an info message in a desktop dialog.
func (a *App) ShowInfo(title string, message string) {
_, _ = runtime.MessageDialog(a.ctx, runtime.MessageDialogOptions{
Type: runtime.InfoDialog,
Title: title,
Message: message,
})
}
// ReadFile shows an open file dialog and returns the data as Base64 string
func (a *App) ReadFile() string {
selection, err := runtime.OpenFileDialog(a.ctx, runtime.OpenDialogOptions{
Title: "Select File",
Filters: []runtime.FileFilter{
{DisplayName: "Excel '97-2004 Workbooks (*.xls)", Pattern: "*.xls"},
{DisplayName: "Excel Workbooks (*.xlsx)", Pattern: "*.xlsx"},
{DisplayName: "Excel Binary Workbooks (*.xlsb)", Pattern: "*.xlsb"},
{DisplayName: "Numbers Spreadsheets (*.numbers)", Pattern: "*.numbers"},
},
})
if err != nil {
_, _ = runtime.MessageDialog(a.ctx, runtime.MessageDialogOptions{
Type: runtime.ErrorDialog,
Title: "Selection Error",
Message: err.Error(),
})
return ""
}
data, err := ioutil.ReadFile(selection)
if err != nil {
_, _ = runtime.MessageDialog(a.ctx, runtime.MessageDialogOptions{
Type: runtime.ErrorDialog,
Title: "Read Error",
Message: err.Error(),
})
return ""
}
return base64.StdEncoding.EncodeToString(data)
}
// SaveFile shows a save file dialog and returns the path
func (a *App) SaveFile() string {
selection, err := runtime.SaveFileDialog(a.ctx, runtime.SaveDialogOptions{
Title: "Select File",
DefaultFilename: "SheetJSWails.xlsx",
Filters: []runtime.FileFilter{
{DisplayName: "Excel '97-2004 Workbooks (*.xls)", Pattern: "*.xls"},
{DisplayName: "Excel Workbooks (*.xlsx)", Pattern: "*.xlsx"},
{DisplayName: "Excel Binary Workbooks (*.xlsb)", Pattern: "*.xlsb"},
{DisplayName: "Numbers Spreadsheets (*.numbers)", Pattern: "*.numbers"},
},
})
if err != nil {
_, _ = runtime.MessageDialog(a.ctx, runtime.MessageDialogOptions{
Type: runtime.ErrorDialog,
Title: "Selection Error",
Message: err.Error(),
})
return ""
}
return selection
}
// WriteFile decodes the first argument and writes to file
func (a *App) WriteFile(b64 string, path string) {
buf, _ := base64.StdEncoding.DecodeString(b64)
_ = ioutil.WriteFile(path, buf, 0644)
}