/
builder.go
480 lines (387 loc) · 9.34 KB
/
builder.go
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// Copyright 2012 The Walk 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 declarative
import (
"fmt"
"reflect"
"strings"
)
import (
"github.com/lxn/walk"
)
var (
conditionsByName = make(map[string]walk.Condition)
imagesByFilePath = make(map[string]walk.Image)
)
func imageFromFile(filePath string) (walk.Image, error) {
if image, ok := imagesByFilePath[filePath]; ok {
return image, nil
}
image, err := walk.NewImageFromFile(filePath)
if err != nil {
return nil, err
}
imagesByFilePath[filePath] = image
return image, nil
}
func MustRegisterCondition(name string, condition walk.Condition) {
if name == "" {
panic(`name == ""`)
}
if condition == nil {
panic("condition == nil")
}
if _, ok := conditionsByName[name]; ok {
panic("name already registered")
}
conditionsByName[name] = condition
}
type declWidget struct {
d Widget
w walk.Window
}
type Builder struct {
level int
columns int
row int
col int
parent walk.Container
declWidgets []declWidget
name2Window map[string]walk.Window
deferredFuncs []func() error
knownCompositeConditions map[string]walk.Condition
}
func NewBuilder(parent walk.Container) *Builder {
return &Builder{
parent: parent,
name2Window: make(map[string]walk.Window),
knownCompositeConditions: make(map[string]walk.Condition),
}
}
func (b *Builder) Parent() walk.Container {
return b.parent
}
func (b *Builder) Defer(f func() error) {
b.deferredFuncs = append(b.deferredFuncs, f)
}
func (b *Builder) deferBuildMenuActions(menu *walk.Menu, items []MenuItem) {
if len(items) > 0 {
b.Defer(func() error {
for _, item := range items {
if _, err := item.createAction(b, menu); err != nil {
return err
}
}
return nil
})
}
}
func (b *Builder) deferBuildActions(actionList *walk.ActionList, items []MenuItem) {
if len(items) > 0 {
b.Defer(func() error {
for _, item := range items {
action, err := item.createAction(b, nil)
if err != nil {
return err
}
if err := actionList.Add(action); err != nil {
return err
}
}
return nil
})
}
}
func (b *Builder) InitWidget(d Widget, w walk.Window, customInit func() error) error {
b.level++
defer func() {
b.level--
}()
var succeeded bool
defer func() {
if !succeeded {
w.Dispose()
}
}()
b.declWidgets = append(b.declWidgets, declWidget{d, w})
// Widget
name, _, _, font, toolTipText, minSize, maxSize, stretchFactor, row, rowSpan, column, columnSpan, alwaysConsumeSpace, contextMenuItems, onKeyDown, onKeyPress, onKeyUp, onMouseDown, onMouseMove, onMouseUp, onSizeChanged := d.WidgetInfo()
w.SetName(name)
if name != "" {
b.name2Window[name] = w
}
if toolTipText != "" {
if widget, ok := w.(walk.Widget); ok {
if err := widget.SetToolTipText(toolTipText); err != nil {
return err
}
}
}
if err := w.SetMinMaxSize(minSize.toW(), maxSize.toW()); err != nil {
return err
}
if len(contextMenuItems) > 0 {
cm, err := walk.NewMenu()
if err != nil {
return err
}
b.deferBuildMenuActions(cm, contextMenuItems)
w.SetContextMenu(cm)
}
if onKeyDown != nil {
w.KeyDown().Attach(onKeyDown)
}
if onKeyPress != nil {
w.KeyPress().Attach(onKeyPress)
}
if onKeyUp != nil {
w.KeyUp().Attach(onKeyUp)
}
if onMouseDown != nil {
w.MouseDown().Attach(onMouseDown)
}
if onMouseMove != nil {
w.MouseMove().Attach(onMouseMove)
}
if onMouseUp != nil {
w.MouseUp().Attach(onMouseUp)
}
if onSizeChanged != nil {
w.SizeChanged().Attach(onSizeChanged)
}
if widget, ok := w.(walk.Widget); ok {
if err := widget.SetAlwaysConsumeSpace(alwaysConsumeSpace); err != nil {
return err
}
type SetStretchFactorer interface {
SetStretchFactor(widget walk.Widget, factor int) error
}
if p := widget.Parent(); p != nil {
switch l := p.Layout().(type) {
case SetStretchFactorer:
if stretchFactor < 1 {
stretchFactor = 1
}
if err := l.SetStretchFactor(widget, stretchFactor); err != nil {
return err
}
case *walk.GridLayout:
if rowSpan < 1 {
rowSpan = 1
}
if columnSpan < 1 {
columnSpan = 1
}
if b.columns > 0 && row == 0 && column == 0 {
if b.col+columnSpan > b.columns {
b.row++
b.col = 0
}
row = b.row
column = b.col
b.col += columnSpan
}
r := walk.Rectangle{column, row, columnSpan, rowSpan}
if err := l.SetRange(widget, r); err != nil {
return err
}
}
}
}
oldParent := b.parent
// Container
var db *walk.DataBinder
if dc, ok := d.(Container); ok {
if wc, ok := w.(walk.Container); ok {
dataBinder, layout, children := dc.ContainerInfo()
if layout != nil {
l, err := layout.Create()
if err != nil {
return err
}
if err := wc.SetLayout(l); err != nil {
return err
}
}
b.parent = wc
defer func() {
b.parent = oldParent
}()
if g, ok := layout.(Grid); ok {
columns := b.columns
defer func() {
b.columns, b.row, b.col = columns, row, column+columnSpan
}()
b.columns = g.Columns
b.row = 0
b.col = 0
}
for _, child := range children {
if err := child.Create(b); err != nil {
return err
}
}
if dataBinder.AssignTo != nil || dataBinder.DataSource != nil {
if dataB, err := dataBinder.create(); err != nil {
return err
} else {
db = dataB
}
}
}
}
// Custom
if customInit != nil {
if err := customInit(); err != nil {
return err
}
}
b.parent = oldParent
// Widget continued
if font != nil {
if f, err := font.Create(); err != nil {
return err
} else if f != nil {
w.SetFont(f)
}
}
if b.level == 1 {
if err := b.initProperties(); err != nil {
return err
}
}
// Call Reset on DataBinder after customInit, so a Dialog gets a chance to first
// wire up its DefaultButton to the CanSubmitChanged event of a DataBinder.
if db != nil {
if _, ok := d.(Container); ok {
if wc, ok := w.(walk.Container); ok {
b.Defer(func() error {
// FIXME: Currently SetDataBinder must be called after initProperties.
wc.SetDataBinder(db)
if db.DataSource() == nil {
return nil
}
return db.Reset()
})
}
}
}
if b.level == 1 {
for _, f := range b.deferredFuncs {
if err := f(); err != nil {
return err
}
}
}
succeeded = true
return nil
}
func (b *Builder) initProperties() error {
for _, dw := range b.declWidgets {
d, w := dw.d, dw.w
sv := reflect.ValueOf(d)
st := sv.Type()
if st.Kind() != reflect.Struct {
panic("d must be a struct value")
}
wb := w.AsWindowBase()
fieldCount := st.NumField()
for i := 0; i < fieldCount; i++ {
sf := st.Field(i)
prop := wb.Property(sf.Name)
switch val := sv.Field(i).Interface().(type) {
case nil:
// nop
case bindData:
if prop == nil {
panic(sf.Name + " is not a property")
}
src := b.conditionOrProperty(val)
if src == nil {
// No luck so far, so we assume the expression refers to
// something in the data source.
src = val.expression
if val.validator != nil {
validator, err := val.validator.Create()
if err != nil {
return err
}
if err := prop.SetValidator(validator); err != nil {
return err
}
}
}
if err := prop.SetSource(src); err != nil {
return err
}
case walk.Condition:
if prop == nil {
panic(sf.Name + " is not a property")
}
if err := prop.SetSource(val); err != nil {
return err
}
default:
if prop == nil {
continue
}
v := prop.Get()
valt, vt := reflect.TypeOf(val), reflect.TypeOf(v)
if v != nil && valt != vt {
panic(fmt.Sprintf("cannot assign value %v of type %T to property %s of type %T", val, val, sf.Name, v))
}
if err := prop.Set(val); err != nil {
return err
}
}
}
}
return nil
}
func (b *Builder) conditionOrProperty(data Property) interface{} {
switch val := data.(type) {
case bindData:
if c, ok := b.knownCompositeConditions[val.expression]; ok {
return c
} else if conds := strings.Split(val.expression, "&&"); len(conds) > 1 {
// This looks like a composite condition.
for i, s := range conds {
conds[i] = strings.TrimSpace(s)
}
var conditions []walk.Condition
for _, cond := range conds {
if p := b.property(cond); p != nil {
conditions = append(conditions, p.(walk.Condition))
} else if c, ok := conditionsByName[cond]; ok {
conditions = append(conditions, c)
} else {
panic("unknown condition or property name: " + cond)
}
}
var condition walk.Condition
if len(conditions) > 1 {
condition = walk.NewAllCondition(conditions...)
b.knownCompositeConditions[val.expression] = condition
} else {
condition = conditions[0]
}
return condition
}
if p := b.property(val.expression); p != nil {
return p
}
return conditionsByName[val.expression]
case walk.Condition:
return val
}
return nil
}
func (b *Builder) property(expression string) walk.Property {
if parts := strings.Split(expression, "."); len(parts) == 2 {
if sw, ok := b.name2Window[parts[0]]; ok {
return sw.AsWindowBase().Property(parts[1])
}
}
return nil
}