Initial commit

app/fyne_demo/tutorials/dialog.go

@@ -0,0 +1,185 @@
+package tutorials
+
+import (
+	"errors"
+	"fmt"
+	"image/color"
+	"io/ioutil"
+	"log"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/canvas"
+	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/data/validation"
+	"fyne.io/fyne/v2/dialog"
+	"fyne.io/fyne/v2/storage"
+	"fyne.io/fyne/v2/theme"
+	"fyne.io/fyne/v2/widget"
+)
+
+func confirmCallback(response bool) {
+	fmt.Println("Responded with", response)
+}
+
+func colorPicked(c color.Color, w fyne.Window) {
+	log.Println("Color picked:", c)
+	rectangle := canvas.NewRectangle(c)
+	size := 2 * theme.IconInlineSize()
+	rectangle.SetMinSize(fyne.NewSize(size, size))
+	dialog.ShowCustom("Color Picked", "Ok", rectangle, w)
+}
+
+// dialogScreen loads demos of the dialogs we support
+func dialogScreen(win fyne.Window) fyne.CanvasObject {
+	return container.NewVScroll(container.NewVBox(
+		widget.NewButton("Info", func() {
+			dialog.ShowInformation("Information", "You should know this thing...", win)
+		}),
+		widget.NewButton("Error", func() {
+			err := errors.New("a dummy error message")
+			dialog.ShowError(err, win)
+		}),
+		widget.NewButton("Confirm", func() {
+			cnf := dialog.NewConfirm("Confirmation", "Are you enjoying this demo?", confirmCallback, win)
+			cnf.SetDismissText("Nah")
+			cnf.SetConfirmText("Oh Yes!")
+			cnf.Show()
+		}),
+		widget.NewButton("File Open With Filter (.jpg or .png)", func() {
+			fd := dialog.NewFileOpen(func(reader fyne.URIReadCloser, err error) {
+				if err != nil {
+					dialog.ShowError(err, win)
+					return
+				}
+				if reader == nil {
+					log.Println("Cancelled")
+					return
+				}
+
+				imageOpened(reader)
+			}, win)
+			fd.SetFilter(storage.NewExtensionFileFilter([]string{".png", ".jpg", ".jpeg"}))
+			fd.Show()
+		}),
+		widget.NewButton("File Save", func() {
+			dialog.ShowFileSave(func(writer fyne.URIWriteCloser, err error) {
+				if err != nil {
+					dialog.ShowError(err, win)
+					return
+				}
+				if writer == nil {
+					log.Println("Cancelled")
+					return
+				}
+
+				fileSaved(writer, win)
+			}, win)
+		}),
+		widget.NewButton("Folder Open", func() {
+			dialog.ShowFolderOpen(func(list fyne.ListableURI, err error) {
+				if err != nil {
+					dialog.ShowError(err, win)
+					return
+				}
+				if list == nil {
+					log.Println("Cancelled")
+					return
+				}
+
+				children, err := list.List()
+				if err != nil {
+					dialog.ShowError(err, win)
+					return
+				}
+				out := fmt.Sprintf("Folder %s (%d children):\n%s", list.Name(), len(children), list.String())
+				dialog.ShowInformation("Folder Open", out, win)
+			}, win)
+		}),
+		widget.NewButton("Color Picker", func() {
+			picker := dialog.NewColorPicker("Pick a Color", "What is your favorite color?", func(c color.Color) {
+				colorPicked(c, win)
+			}, win)
+			picker.Show()
+		}),
+		widget.NewButton("Advanced Color Picker", func() {
+			picker := dialog.NewColorPicker("Pick a Color", "What is your favorite color?", func(c color.Color) {
+				colorPicked(c, win)
+			}, win)
+			picker.Advanced = true
+			picker.Show()
+		}),
+		widget.NewButton("Form Dialog (Login Form)", func() {
+			username := widget.NewEntry()
+			username.Validator = validation.NewRegexp(`^[A-Za-z0-9_-]+$`, "username can only contain letters, numbers, '_', and '-'")
+			password := widget.NewPasswordEntry()
+			password.Validator = validation.NewRegexp(`^[A-Za-z0-9_-]+$`, "password can only contain letters, numbers, '_', and '-'")
+			remember := false
+			items := []*widget.FormItem{
+				widget.NewFormItem("Username", username),
+				widget.NewFormItem("Password", password),
+				widget.NewFormItem("Remember me", widget.NewCheck("", func(checked bool) {
+					remember = checked
+				})),
+			}
+
+			dialog.ShowForm("Login...", "Log In", "Cancel", items, func(b bool) {
+				if !b {
+					return
+				}
+				var rememberText string
+				if remember {
+					rememberText = "and remember this login"
+				}
+
+				log.Println("Please Authenticate", username.Text, password.Text, rememberText)
+			}, win)
+		}),
+	))
+}
+
+func imageOpened(f fyne.URIReadCloser) {
+	if f == nil {
+		log.Println("Cancelled")
+		return
+	}
+	defer f.Close()
+
+	showImage(f)
+}
+
+func fileSaved(f fyne.URIWriteCloser, w fyne.Window) {
+	defer f.Close()
+	_, err := f.Write([]byte("Written by Fyne demo\n"))
+	if err != nil {
+		dialog.ShowError(err, w)
+	}
+	err = f.Close()
+	if err != nil {
+		dialog.ShowError(err, w)
+	}
+	log.Println("Saved to...", f.URI())
+}
+
+func loadImage(f fyne.URIReadCloser) *canvas.Image {
+	data, err := ioutil.ReadAll(f)
+	if err != nil {
+		fyne.LogError("Failed to load image data", err)
+		return nil
+	}
+	res := fyne.NewStaticResource(f.URI().Name(), data)
+
+	return canvas.NewImageFromResource(res)
+}
+
+func showImage(f fyne.URIReadCloser) {
+	img := loadImage(f)
+	if img == nil {
+		return
+	}
+	img.FillMode = canvas.ImageFillOriginal
+
+	w := fyne.CurrentApp().NewWindow(f.URI().Name())
+	w.SetContent(container.NewScroll(img))
+	w.Resize(fyne.NewSize(320, 240))
+	w.Show()
+}