package rui import ( "encoding/base64" "fmt" "strconv" "strings" "time" ) const ( // FileSelectedEvent is the constant for "file-selected-event" property tag. // The "file-selected-event" is fired when user selects file(s) in the FilePicker. FileSelectedEvent = "file-selected-event" // Accept is the constant for "accept" property tag. // The "accept" property of the FilePicker sets the list of allowed file extensions or MIME types. Accept = "accept" // Multiple is the constant for "multiple" property tag. // The "multiple" bool property of the FilePicker sets whether multiple files can be selected Multiple = "multiple" ) // FileInfo describes a file which selected in the FilePicker view type FileInfo struct { // Name - the file's name. Name string // LastModified specifying the date and time at which the file was last modified LastModified time.Time // Size - the size of the file in bytes. Size int64 // MimeType - the file's MIME type. MimeType string } // FilePicker - the control view for the files selecting type FilePicker interface { View // Files returns the list of selected files. // If there are no files selected then an empty slice is returned (the result is always not nil) Files() []FileInfo // LoadFile loads the content of the selected file. This function is asynchronous. // The "result" function will be called after loading the data. LoadFile(file FileInfo, result func(FileInfo, []byte)) } type filePickerData struct { viewData files []FileInfo fileSelectedListeners []func(FilePicker, []FileInfo) loader map[int]func(FileInfo, []byte) } func (file *FileInfo) initBy(node DataValue) { if obj := node.Object(); obj != nil { file.Name, _ = obj.PropertyValue("name") file.MimeType, _ = obj.PropertyValue("mime-type") if size, ok := obj.PropertyValue("size"); ok { if n, err := strconv.ParseInt(size, 10, 64); err == nil { file.Size = n } } if value, ok := obj.PropertyValue("last-modified"); ok { if n, err := strconv.ParseInt(value, 10, 64); err == nil { file.LastModified = time.UnixMilli(n) } } } } // NewFilePicker create new FilePicker object and return it func NewFilePicker(session Session, params Params) FilePicker { view := new(filePickerData) view.Init(session) setInitParams(view, params) return view } func newFilePicker(session Session) View { return NewFilePicker(session, nil) } func (picker *filePickerData) Init(session Session) { picker.viewData.Init(session) picker.tag = "FilePicker" picker.files = []FileInfo{} picker.loader = map[int]func(FileInfo, []byte){} picker.fileSelectedListeners = []func(FilePicker, []FileInfo){} } func (picker *filePickerData) Files() []FileInfo { return picker.files } func (picker *filePickerData) LoadFile(file FileInfo, result func(FileInfo, []byte)) { if result == nil { return } for i, info := range picker.files { if info.Name == file.Name && info.Size == file.Size && info.LastModified == file.LastModified { picker.loader[i] = result picker.Session().runScript(fmt.Sprintf(`loadSelectedFile("%s", %d)`, picker.htmlID(), i)) return } } } func (picker *filePickerData) Remove(tag string) { picker.remove(strings.ToLower(tag)) } func (picker *filePickerData) remove(tag string) { switch tag { case FileSelectedEvent: picker.fileSelectedListeners = []func(FilePicker, []FileInfo){} default: picker.viewData.remove(tag) } } func (picker *filePickerData) Set(tag string, value interface{}) bool { return picker.set(strings.ToLower(tag), value) } func (picker *filePickerData) set(tag string, value interface{}) bool { if value == nil { picker.remove(tag) return true } switch tag { case FileSelectedEvent: switch value := value.(type) { case func(FilePicker, []FileInfo): picker.fileSelectedListeners = []func(FilePicker, []FileInfo){value} case func([]FileInfo): fn := func(view FilePicker, files []FileInfo) { value(files) } picker.fileSelectedListeners = []func(FilePicker, []FileInfo){fn} case []func(FilePicker, []FileInfo): picker.fileSelectedListeners = value case []func([]FileInfo): listeners := make([]func(FilePicker, []FileInfo), len(value)) for i, val := range value { if val == nil { notCompatibleType(tag, val) return false } listeners[i] = func(view FilePicker, files []FileInfo) { val(files) } } picker.fileSelectedListeners = listeners case []interface{}: listeners := make([]func(FilePicker, []FileInfo), len(value)) for i, val := range value { if val == nil { notCompatibleType(tag, val) return false } switch val := val.(type) { case func(FilePicker, []FileInfo): listeners[i] = val case func([]FileInfo): listeners[i] = func(view FilePicker, files []FileInfo) { val(files) } default: notCompatibleType(tag, val) return false } } picker.fileSelectedListeners = listeners } return true case Accept: switch value := value.(type) { case string: value = strings.Trim(value, " \t\n") if value == "" { picker.remove(Accept) } else { picker.properties[Accept] = value } case []string: buffer := allocStringBuilder() defer freeStringBuilder(buffer) for _, val := range value { val = strings.Trim(val, " \t\n") if val != "" { if buffer.Len() > 0 { buffer.WriteRune(',') } buffer.WriteString(val) } } if buffer.Len() == 0 { picker.remove(Accept) } else { picker.properties[Accept] = buffer.String() } default: notCompatibleType(tag, value) return false } return true default: return picker.viewData.set(tag, value) } } func (picker *filePickerData) htmlTag() string { return "input" } func (picker *filePickerData) acceptCSS() string { accept, ok := stringProperty(picker, Accept, picker.Session()) if !ok { accept, ok = valueFromStyle(picker, Accept) } if ok { buffer := allocStringBuilder() defer freeStringBuilder(buffer) for _, value := range strings.Split(accept, ",") { if value = strings.Trim(value, " \t\n"); value != "" { if buffer.Len() > 0 { buffer.WriteString(", ") } if value[0] != '.' && !strings.Contains(value, "/") { buffer.WriteRune('.') } buffer.WriteString(value) } } return buffer.String() } return "" } func (picker *filePickerData) htmlProperties(self View, buffer *strings.Builder) { picker.viewData.htmlProperties(self, buffer) if accept := picker.acceptCSS(); accept != "" { buffer.WriteString(` accept="`) buffer.WriteString(accept) buffer.WriteRune('"') } buffer.WriteString(` type="file"`) if multiple, ok := boolStyledProperty(picker, Multiple); ok && multiple { buffer.WriteString(` multiple`) } buffer.WriteString(` oninput="fileSelectedEvent(this)"`) } func (picker *filePickerData) htmlDisabledProperties(self View, buffer *strings.Builder) { if IsDisabled(self) { buffer.WriteString(` disabled`) } picker.viewData.htmlDisabledProperties(self, buffer) } func (picker *filePickerData) handleCommand(self View, command string, data DataObject) bool { switch command { case "fileSelected": if node := data.PropertyWithTag("files"); node != nil && node.Type() == ArrayNode { count := node.ArraySize() files := make([]FileInfo, count) for i := 0; i < count; i++ { if value := node.ArrayElement(i); value != nil { files[i].initBy(value) } } picker.files = files for _, listener := range picker.fileSelectedListeners { listener(picker, files) } } return true case "fileLoaded": if index, ok := dataIntProperty(data, "index"); ok { if result, ok := picker.loader[index]; ok { var file FileInfo file.initBy(data) var fileData []byte = nil if base64Data, ok := data.PropertyValue("data"); ok { if index := strings.LastIndex(base64Data, ","); index >= 0 { base64Data = base64Data[index+1:] } decode, err := base64.StdEncoding.DecodeString(base64Data) if err == nil { fileData = decode } else { ErrorLog(err.Error()) } } result(file, fileData) delete(picker.loader, index) } } return true case "fileLoadingError": if error, ok := data.PropertyValue("error"); ok { ErrorLog(error) } if index, ok := dataIntProperty(data, "index"); ok { if result, ok := picker.loader[index]; ok { if index >= 0 && index < len(picker.files) { result(picker.files[index], nil) } else { result(FileInfo{}, nil) } delete(picker.loader, index) } } return true } return picker.viewData.handleCommand(self, command, data) } // GetFilePickerFiles returns the list of FilePicker selected files // If there are no files selected then an empty slice is returned (the result is always not nil) // If the second argument (subviewID) is "" then selected files of the first argument (view) is returned func GetFilePickerFiles(view View, subviewID string) []FileInfo { if picker := FilePickerByID(view, subviewID); picker != nil { return picker.Files() } return []FileInfo{} } // LoadFilePickerFile loads the content of the selected file. This function is asynchronous. // The "result" function will be called after loading the data. // If the second argument (subviewID) is "" then the file from the first argument (view) is loaded func LoadFilePickerFile(view View, subviewID string, file FileInfo, result func(FileInfo, []byte)) { if picker := FilePickerByID(view, subviewID); picker != nil { picker.LoadFile(file, result) } } // IsMultipleFilePicker returns "true" if multiple files can be selected in the FilePicker, "false" otherwise. // If the second argument (subviewID) is "" then a value from the first argument (view) is returned. func IsMultipleFilePicker(view View, subviewID string) bool { if subviewID != "" { view = ViewByID(view, subviewID) } if view != nil { if result, ok := boolStyledProperty(view, Multiple); ok { return result } } return false } // GetFilePickerAccept returns sets the list of allowed file extensions or MIME types. // If the second argument (subviewID) is "" then a value from the first argument (view) is returned. func GetFilePickerAccept(view View, subviewID string) []string { if subviewID != "" { view = ViewByID(view, subviewID) } if view != nil { accept, ok := stringProperty(view, Accept, view.Session()) if !ok { accept, ok = valueFromStyle(view, Accept) } if ok { result := strings.Split(accept, ",") for i := 0; i < len(result); i++ { result[i] = strings.Trim(result[i], " \t\n") } return result } } return []string{} } // GetFileSelectedListeners returns the "file-selected-event" listener list. // If there are no listeners then the empty list is returned. // If the second argument (subviewID) is "" then a value from the first argument (view) is returned. func GetFileSelectedListeners(view View, subviewID string) []func(FilePicker, []FileInfo) { if subviewID != "" { view = ViewByID(view, subviewID) } if view != nil { if value := view.Get(FileSelectedEvent); value != nil { if result, ok := value.([]func(FilePicker, []FileInfo)); ok { return result } } } return []func(FilePicker, []FileInfo){} }