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structview.go
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structview.go
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// Copyright (c) 2018, The GoKi Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package giv
import (
"fmt"
"reflect"
"regexp"
"strconv"
"strings"
"github.com/antonmedv/expr"
"github.com/antonmedv/expr/ast"
"github.com/goki/gi/gi"
"github.com/goki/gi/gist"
"github.com/goki/gi/units"
"github.com/goki/gosl/slbool"
"github.com/goki/ki/ki"
"github.com/goki/ki/kit"
)
// StructView represents a struct, creating a property editor of the fields --
// constructs Children widgets to show the field names and editor fields for
// each field, within an overall frame.
// Automatically has a toolbar with Struct ToolBar props if defined
// set prop toolbar = false to turn off
type StructView struct {
gi.Frame
Struct interface{} `desc:"the struct that we are a view onto"`
StructValView ValueView `desc:"ValueView for the struct itself, if this was created within value view framework -- otherwise nil"`
Changed bool `desc:"has the value of any field changed? updated by the ViewSig signals from fields"`
ChangeFlag *reflect.Value `json:"-" xml:"-" desc:"ValueView for a field marked with changeflag struct tag, which must be a bool type, which is updated when changes are registered in field values."`
FieldViews []ValueView `json:"-" xml:"-" desc:"ValueView representations of the fields"`
TmpSave ValueView `json:"-" xml:"-" desc:"value view that needs to have SaveTmp called on it whenever a change is made to one of the underlying values -- pass this down to any sub-views created from a parent"`
ViewSig ki.Signal `json:"-" xml:"-" desc:"signal for valueview -- only one signal sent when a value has been set -- all related value views interconnect with each other to update when others update"`
ViewPath string `desc:"a record of parent View names that have led up to this view -- displayed as extra contextual information in view dialog windows"`
ToolbarStru interface{} `desc:"the struct that we successfully set a toolbar for"`
HasDefs bool `json:"-" xml:"-" inactive:"+" desc:"if true, some fields have default values -- update labels when values change"`
HasViewIfs bool `json:"-" xml:"-" inactive:"+" desc:"if true, some fields have viewif conditional view tags -- update after.."`
TypeFieldTags map[string]string `json:"-" xml:"-" inactive:"+" desc:"extra tags by field name -- from type properties"`
}
var KiT_StructView = kit.Types.AddType(&StructView{}, StructViewProps)
// AddNewStructView adds a new structview to given parent node, with given name.
func AddNewStructView(parent ki.Ki, name string) *StructView {
return parent.AddNewChild(KiT_StructView, name).(*StructView)
}
func (sv *StructView) Disconnect() {
sv.Frame.Disconnect()
sv.ViewSig.DisconnectAll()
}
var StructViewProps = ki.Props{
"EnumType:Flag": gi.KiT_NodeFlags,
"background-color": &gi.Prefs.Colors.Background,
"color": &gi.Prefs.Colors.Font,
"max-width": -1,
"max-height": -1,
}
// SetStruct sets the source struct that we are viewing -- rebuilds the
// children to represent this struct
func (sv *StructView) SetStruct(st interface{}) {
updt := false
if sv.Struct != st {
sv.Changed = false
updt = sv.UpdateStart()
sv.SetFullReRender()
if sv.Struct != nil {
if k, ok := sv.Struct.(ki.Ki); ok {
k.NodeSignal().Disconnect(sv.This())
}
}
sv.Struct = st
tp := kit.Types.Properties(kit.NonPtrType(reflect.TypeOf(sv.Struct)), false)
if tp != nil {
if sfp, has := ki.SubTypeProps(*tp, "StructViewFields"); has {
sv.TypeFieldTags = make(map[string]string)
for k, v := range sfp {
vs := kit.ToString(v)
sv.TypeFieldTags[k] = vs
}
}
}
if k, ok := st.(ki.Ki); ok {
k.NodeSignal().Connect(sv.This(), func(recv, send ki.Ki, sig int64, data interface{}) {
// todo: check for delete??
svv, _ := recv.Embed(KiT_StructView).(*StructView)
svv.UpdateFields()
svv.ViewSig.Emit(svv.This(), 0, nil)
})
}
}
sv.Config()
sv.UpdateEnd(updt)
}
// UpdateFields updates each of the value-view widgets for the fields --
// called by the ViewSig update
func (sv *StructView) UpdateFields() {
updt := sv.UpdateStart()
for _, vv := range sv.FieldViews {
vv.UpdateWidget()
}
sv.UpdateEnd(updt)
}
// UpdateField updates the value-view widget for the named field
func (sv *StructView) UpdateField(field string) {
updt := sv.UpdateStart()
for _, vv := range sv.FieldViews {
if vv.Name() == field {
vv.UpdateWidget()
break
}
}
sv.UpdateEnd(updt)
}
// Config configures the view
func (sv *StructView) Config() {
if ks, ok := sv.Struct.(ki.Ki); ok {
if ks.IsDeleted() || ks.IsDestroyed() {
return
}
}
sv.Lay = gi.LayoutVert
sv.SetProp("spacing", gi.StdDialogVSpaceUnits)
config := kit.TypeAndNameList{}
config.Add(gi.KiT_ToolBar, "toolbar")
config.Add(gi.KiT_Frame, "struct-grid")
mods, updt := sv.ConfigChildren(config)
sv.ConfigStructGrid()
sv.ConfigToolbar()
if mods {
sv.UpdateEnd(updt)
}
}
// IsConfiged returns true if the widget is fully configured
func (sv *StructView) IsConfiged() bool {
if len(sv.Kids) == 0 {
return false
}
return true
}
// StructGrid returns the grid layout widget, which contains all the fields and values
func (sv *StructView) StructGrid() *gi.Frame {
return sv.ChildByName("struct-grid", 2).(*gi.Frame)
}
// ToolBar returns the toolbar widget
func (sv *StructView) ToolBar() *gi.ToolBar {
return sv.ChildByName("toolbar", 1).(*gi.ToolBar)
}
// ConfigToolbar adds a toolbar based on the methview ToolBarView function, if
// one has been defined for this struct type through its registered type
// properties.
func (sv *StructView) ConfigToolbar() {
if kit.IfaceIsNil(sv.Struct) {
return
}
if sv.ToolbarStru == sv.Struct {
return
}
if pv, ok := sv.PropInherit("toolbar", ki.NoInherit, ki.TypeProps); ok {
pvb, _ := kit.ToBool(pv)
if !pvb {
sv.ToolbarStru = sv.Struct
return
}
}
tb := sv.ToolBar()
tb.SetStretchMaxWidth()
svtp := kit.NonPtrType(reflect.TypeOf(sv.Struct))
ttip := "update this StructView (not any other views that might be present) to show current state of this struct of type: " + svtp.String()
if len(*tb.Children()) == 0 {
tb.AddAction(gi.ActOpts{Label: "UpdtView", Icon: "update", Tooltip: ttip},
sv.This(), func(recv, send ki.Ki, sig int64, data interface{}) {
svv := recv.Embed(KiT_StructView).(*StructView)
svv.UpdateFields()
})
} else {
act := tb.Child(0).(*gi.Action)
act.Tooltip = ttip
}
ndef := 1 // number of default actions
sz := len(*tb.Children())
if sz > ndef {
for i := sz - 1; i >= ndef; i-- {
tb.DeleteChildAtIndex(i, ki.DestroyKids)
}
}
if HasToolBarView(sv.Struct) {
ToolBarView(sv.Struct, sv.Viewport, tb)
tb.SetFullReRender()
}
sv.ToolbarStru = sv.Struct
}
// FieldTags returns the integrated tags for this field
func (sv *StructView) FieldTags(fld reflect.StructField) reflect.StructTag {
if sv.TypeFieldTags == nil {
return fld.Tag
}
ft, has := sv.TypeFieldTags[fld.Name]
if !has {
return fld.Tag
}
return fld.Tag + " " + reflect.StructTag(ft)
}
// ConfigStructGrid configures the StructGrid for the current struct
func (sv *StructView) ConfigStructGrid() {
if kit.IfaceIsNil(sv.Struct) {
return
}
sg := sv.StructGrid()
sg.Lay = gi.LayoutGrid
sg.Stripes = gi.RowStripes
// setting a pref here is key for giving it a scrollbar in larger context
sg.SetMinPrefHeight(units.NewEm(1.5))
sg.SetMinPrefWidth(units.NewEm(10))
sg.SetStretchMax() // for this to work, ALL layers above need it too
sg.SetProp("overflow", gist.OverflowScroll) // this still gives it true size during PrefSize
sg.SetProp("columns", 2)
config := kit.TypeAndNameList{}
// always start fresh!
sv.FieldViews = make([]ValueView, 0)
kit.FlatFieldsValueFunc(sv.Struct, func(fval interface{}, typ reflect.Type, field reflect.StructField, fieldVal reflect.Value) bool {
// todo: check tags, skip various etc
ftags := sv.FieldTags(field)
_, got := ftags.Lookup("changeflag")
if got {
if field.Type.Kind() == reflect.Bool {
sv.ChangeFlag = &fieldVal
}
}
vwtag := ftags.Get("view")
if vwtag == "-" {
return true
}
viewif := field.Tag.Get("viewif")
if viewif != "" {
sv.HasViewIfs = true
if !StructViewIf(viewif, field, sv.Struct) {
return true
}
}
if vwtag == "add-fields" && field.Type.Kind() == reflect.Struct {
fvalp := fieldVal.Addr().Interface()
kit.FlatFieldsValueFunc(fvalp, func(sfval interface{}, styp reflect.Type, sfield reflect.StructField, sfieldVal reflect.Value) bool {
svwtag := sfield.Tag.Get("view")
if svwtag == "-" {
return true
}
viewif := sfield.Tag.Get("viewif")
if viewif != "" {
sv.HasViewIfs = true
if !StructViewIf(viewif, sfield, fvalp) {
return true
}
}
svv := FieldToValueView(fvalp, sfield.Name, sfval)
if svv == nil { // shouldn't happen
return true
}
svvp := sfieldVal.Addr()
svv.SetStructValue(svvp, fvalp, &sfield, sv.TmpSave, sv.ViewPath)
svtyp := svv.WidgetType()
// todo: other things with view tag..
fnm := field.Name + "." + sfield.Name
svv.SetTag("label", fnm)
labnm := fmt.Sprintf("label-%v", fnm)
valnm := fmt.Sprintf("value-%v", fnm)
config.Add(gi.KiT_Label, labnm)
config.Add(svtyp, valnm) // todo: extend to diff types using interface..
sv.FieldViews = append(sv.FieldViews, svv)
return true
})
return true
}
vv := FieldToValueView(sv.Struct, field.Name, fval)
if vv == nil { // shouldn't happen
return true
}
vvp := fieldVal.Addr()
vv.SetStructValue(vvp, sv.Struct, &field, sv.TmpSave, sv.ViewPath)
vtyp := vv.WidgetType()
// todo: other things with view tag..
labnm := fmt.Sprintf("label-%v", field.Name)
valnm := fmt.Sprintf("value-%v", field.Name)
config.Add(gi.KiT_Label, labnm)
config.Add(vtyp, valnm) // todo: extend to diff types using interface..
sv.FieldViews = append(sv.FieldViews, vv)
return true
})
mods, updt := sg.ConfigChildren(config) // fields could be non-unique with labels..
if mods {
sg.SetFullReRender()
} else {
updt = sg.UpdateStart()
}
sv.HasDefs = false
for i, vv := range sv.FieldViews {
lbl := sg.Child(i * 2).(*gi.Label)
vvb := vv.AsValueViewBase()
vvb.ViewPath = sv.ViewPath
lbl.Redrawable = true
widg := sg.Child((i * 2) + 1).(gi.Node2D)
widg.SetProp("horizontal-align", gist.AlignLeft)
hasDef, inactTag := StructViewFieldTags(vv, lbl, widg, sv.IsInactive())
if hasDef {
sv.HasDefs = true
}
vv.ConfigWidget(widg)
if !sv.IsInactive() && !inactTag {
vvb.ViewSig.ConnectOnly(sv.This(), func(recv, send ki.Ki, sig int64, data interface{}) {
svv := recv.Embed(KiT_StructView).(*StructView)
svv.UpdateFieldAction()
// note: updating vv here is redundant -- relevant field will have already updated
svv.Changed = true
if svv.ChangeFlag != nil {
svv.ChangeFlag.SetBool(true)
}
vvv := send.(ValueView).AsValueViewBase()
if !kit.KindIsBasic(kit.NonPtrValue(vvv.Value).Kind()) {
if updtr, ok := svv.Struct.(gi.Updater); ok {
// fmt.Printf("updating: %v kind: %v\n", updtr, vvv.Value.Kind())
updtr.Update()
}
}
tb := svv.ToolBar()
if tb != nil {
tb.UpdateActions()
}
svv.ViewSig.Emit(svv.This(), 0, nil)
// vvv, _ := send.Embed(KiT_ValueViewBase).(*ValueViewBase)
// fmt.Printf("sview got edit from vv %v field: %v\n", vvv.Nm, vvv.Field.Name)
})
}
}
sg.UpdateEnd(updt)
}
func (sv *StructView) Style2D() {
mvp := sv.ViewportSafe()
if mvp != nil && mvp.IsDoingFullRender() {
sv.Config()
}
sv.Frame.Style2D()
}
func (sv *StructView) UpdateFieldAction() {
if !sv.IsConfiged() {
return
}
if sv.HasViewIfs {
sv.Config()
} else if sv.HasDefs {
sg := sv.StructGrid()
updt := sg.UpdateStart()
for i, vv := range sv.FieldViews {
lbl := sg.Child(i * 2).(*gi.Label)
StructViewFieldDefTag(vv, lbl)
}
sg.UpdateEnd(updt)
}
}
func (sv *StructView) Render2D() {
if sv.IsConfiged() {
sv.ToolBar().UpdateActions()
}
if win := sv.ParentWindow(); win != nil {
if !win.IsResizing() {
win.MainMenuUpdateActives()
}
}
sv.Frame.Render2D()
}
/////////////////////////////////////////////////////////////////////////
// Tag parsing
// StructViewFieldTags processes the tags for a field in a struct view, setting
// the properties on the label or widget appropriately
// returns true if there were any "def" default tags -- if so, needs updating
func StructViewFieldTags(vv ValueView, lbl *gi.Label, widg gi.Node2D, isInact bool) (hasDef, inactTag bool) {
vvb := vv.AsValueViewBase()
if lbltag, has := vv.Tag("label"); has {
lbl.Text = lbltag
} else {
lbl.Text = vvb.Field.Name
}
if _, has := vv.Tag("inactive"); has {
inactTag = true
widg.AsNode2D().SetInactive()
} else {
if isInact {
widg.AsNode2D().SetInactive()
vv.SetTag("inactive", "true")
}
}
defStr := ""
hasDef, _, defStr = StructViewFieldDefTag(vv, lbl)
if ttip, has := vv.Tag("desc"); has {
lbl.Tooltip = defStr + ttip
}
return
}
// StructViewFieldDefTag processes the "def" tag for default values -- can be
// called multiple times for updating as values change.
// returns true if value is default, and string to add to tooltip for default vals
func StructViewFieldDefTag(vv ValueView, lbl *gi.Label) (hasDef bool, isDef bool, defStr string) {
if dtag, has := vv.Tag("def"); has {
hasDef = true
isDef, defStr = StructFieldIsDef(dtag, vv.Val().Interface())
if isDef {
lbl.CurBgColor = gi.Prefs.Colors.Background
} else {
lbl.CurBgColor = gi.Prefs.Colors.Highlight
}
return
}
return
}
// StructFieldIsDef processses "def" tag for default value(s) of field
// defs = default values as strings as either comma-separated list of valid values
// or low:high value range (only for int or float numeric types)
// valPtr = pointer to value
// returns true if value is default, and string to add to tooltip for default values
func StructFieldIsDef(defs string, valPtr interface{}) (bool, string) {
defStr := "[Def: " + defs + "] "
def := false
if strings.Contains(defs, ":") {
dtags := strings.Split(defs, ":")
lo, _ := strconv.ParseFloat(dtags[0], 64)
hi, _ := strconv.ParseFloat(dtags[1], 64)
switch fv := valPtr.(type) {
case *float32:
if lo <= float64(*fv) && float64(*fv) <= hi {
def = true
}
case *float64:
if lo <= *fv && *fv <= hi {
def = true
}
case *int32:
if lo <= float64(*fv) && float64(*fv) <= hi {
def = true
}
case *int64:
if lo <= float64(*fv) && float64(*fv) <= hi {
def = true
}
case *int:
if lo <= float64(*fv) && float64(*fv) <= hi {
def = true
}
}
} else {
val := kit.ToStringPrec(valPtr, 6)
if strings.HasPrefix(val, "&") {
val = val[1:]
}
dtags := strings.Split(defs, ",")
for _, dv := range dtags {
if dv == strings.TrimSpace(val) {
def = true
break
}
}
}
return def, defStr
}
type viewifPatcher struct{}
var (
replaceEqualsRegexp = regexp.MustCompile(`([^\!\=\<\>])(=)([^\!\=\<\>])`)
stringer = reflect.TypeOf((*fmt.Stringer)(nil)).Elem()
slboolv = reflect.TypeOf((*slbool.Bool)(nil)).Elem()
)
func (p *viewifPatcher) Visit(node *ast.Node) {
switch x := (*node).(type) {
case *ast.IdentifierNode:
lt := x.Type()
if lt == nil {
return
}
switch {
case lt == slboolv:
ast.Patch(node, &ast.CallNode{
Callee: &ast.MemberNode{
Node: *node,
Property: &ast.StringNode{Value: "IsTrue"},
},
})
}
case *ast.BinaryNode:
lid, lok := x.Left.(*ast.IdentifierNode)
rid, rok := x.Right.(*ast.IdentifierNode)
rars, rrok := x.Right.(*ast.ArrayNode)
switch {
case lok && rok && (x.Operator == "==" || x.Operator == "!="):
lt := lid.Type()
if lt == nil {
return
}
switch {
case lt.Implements(stringer):
ast.Patch(node, &ast.BinaryNode{
Operator: x.Operator,
Left: &ast.CallNode{
Callee: &ast.MemberNode{
Node: x.Left,
Property: &ast.StringNode{Value: "String"},
},
},
Right: &ast.StringNode{
Value: rid.Value,
},
})
}
case lok && rrok && (x.Operator == "=="):
var strs []ast.Node
for _, on := range rars.Nodes {
strs = append(strs, &ast.StringNode{Value: on.(*ast.IdentifierNode).Value})
}
ast.Patch(node, &ast.BinaryNode{
Operator: "in",
Left: &ast.CallNode{
Callee: &ast.MemberNode{
Node: x.Left,
Property: &ast.StringNode{Value: "String"},
},
},
Right: &ast.ArrayNode{
Nodes: strs,
},
})
}
}
}
// StructViewIf parses given `viewif:"expr"` expression and returns
// true if should be visible, false if not.
// Prints an error if the expression is not parsed properly
// or does not evaluate to a boolean.
func StructViewIf(viewif string, field reflect.StructField, stru interface{}) bool {
// replace = -> == without screwing up existing ==, !=, >=, <=
viewif = replaceEqualsRegexp.ReplaceAllString(viewif, "$1==$3")
program, err := expr.Compile(viewif, expr.Env(stru), expr.Patch(&viewifPatcher{}), expr.AllowUndefinedVariables())
if err != nil {
if gi.StructViewIfDebug {
fmt.Printf("giv.StructView viewif tag on field %s: syntax error: `%s`: %s\n", field.Name, viewif, err)
}
return true
}
val, err := expr.Run(program, stru)
if err != nil {
if gi.StructViewIfDebug {
fmt.Printf("giv.StructView viewif tag on field %s: run error: `%s`: %s\n", field.Name, viewif, err)
}
return true
}
if err != nil {
if gi.StructViewIfDebug {
fmt.Printf("giv.StructView viewif tag on field %s: syntax error: `%s`: %s\n", field.Name, viewif, err)
}
return true // visible by default
}
// fmt.Printf("fld: %s viewif: %s val: %t %+v\n", field.Name, viewif, val, val)
switch x := val.(type) {
case bool:
return x
case *bool:
return *x
}
if gi.StructViewIfDebug {
fmt.Printf("giv.StructView viewif tag on field %s: didn't evaluate to a boolean: `%s`: type: %t val: %+v\n", field.Name, viewif, val, val)
}
return true
}
// StructFieldVals represents field values in a struct, at multiple
// levels of depth potentially (represented by the Path field)
// used for StructNonDefFields for example.
type StructFieldVals struct {
Path string `desc:"path of field.field parent fields to this field"`
Field reflect.StructField `desc:"type information for field"`
Val reflect.Value `desc:"value of field (as a pointer)"`
Defs string `desc:"def tag information for default values"`
}
// StructNonDefFields processses "def" tag for default value(s)
// of fields in given struct and starting path, and returns all
// fields not at their default values.
// See also StructNoDefFieldsStr for a string representation of this information.
// Uses kit.FlatFieldsValueFunc to get all embedded fields.
// Uses a recursive strategy -- any fields that are themselves structs are
// expanded, and the field name represented by dots path separators.
func StructNonDefFields(structPtr interface{}, path string) []StructFieldVals {
var flds []StructFieldVals
kit.FlatFieldsValueFunc(structPtr, func(fval interface{}, typ reflect.Type, field reflect.StructField, fieldVal reflect.Value) bool {
vvp := fieldVal.Addr()
if field.Type.Kind() == reflect.Struct {
spath := path
if path != "" {
spath += "."
}
spath += field.Name
subs := StructNonDefFields(vvp.Interface(), spath)
if len(subs) > 0 {
flds = append(flds, subs...)
}
return true
}
dtag, got := field.Tag.Lookup("def")
if !got {
return true
}
def, defStr := StructFieldIsDef(dtag, vvp.Interface())
if def {
return true
}
flds = append(flds, StructFieldVals{Path: path, Field: field, Val: vvp, Defs: defStr})
return true
})
return flds
}
// StructNonDefFieldsStr processses "def" tag for default value(s) of fields in
// given struct, and returns a string of all those not at their default values,
// in format: Path.Field: val // default value(s)
// Uses a recursive strategy -- any fields that are themselves structs are
// expanded, and the field name represented by dots path separators.
func StructNonDefFieldsStr(structPtr interface{}, path string) string {
flds := StructNonDefFields(structPtr, path)
if len(flds) == 0 {
return ""
}
str := ""
for _, fld := range flds {
pth := fld.Path
fnm := fld.Field.Name
val := kit.ToStringPrec(fld.Val.Interface(), 6)
dfs := fld.Defs
if len(pth) > 0 {
fnm = pth + "." + fnm
}
str += fmt.Sprintf("%s: %s // %s<br>\n", fnm, val, dfs)
}
return str
}