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select.go
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select.go
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package widget
import (
"image/color"
"time"
"fyne.io/fyne"
"fyne.io/fyne/canvas"
"fyne.io/fyne/driver/desktop"
"fyne.io/fyne/internal/widget"
"fyne.io/fyne/theme"
)
const defaultPlaceHolder string = "(Select one)"
type selectRenderer struct {
*widget.ShadowingRenderer
icon *Icon
label *canvas.Text
combo *Select
}
// MinSize calculates the minimum size of a select button.
// This is based on the selected text, the drop icon and a standard amount of padding added.
func (s *selectRenderer) MinSize() fyne.Size {
s.combo.propertyLock.RLock()
defer s.combo.propertyLock.RUnlock()
min := fyne.MeasureText(s.combo.PlaceHolder, s.label.TextSize, s.label.TextStyle)
for _, option := range s.combo.Options {
optionMin := fyne.MeasureText(option, s.label.TextSize, s.label.TextStyle)
min = min.Union(optionMin)
}
min = min.Add(fyne.NewSize(theme.Padding()*4, theme.Padding()*2))
return min.Add(fyne.NewSize(theme.IconInlineSize()+theme.Padding(), 0))
}
// Layout the components of the button widget
func (s *selectRenderer) Layout(size fyne.Size) {
s.LayoutShadow(size, fyne.NewPos(0, 0))
inner := size.Subtract(fyne.NewSize(theme.Padding()*4, theme.Padding()*2))
offset := fyne.NewSize(theme.IconInlineSize(), 0)
labelSize := inner.Subtract(offset)
s.combo.propertyLock.RLock()
defer s.combo.propertyLock.RUnlock()
s.label.Resize(labelSize)
s.label.Move(fyne.NewPos(theme.Padding()*2, theme.Padding()))
s.icon.Resize(fyne.NewSize(theme.IconInlineSize(), theme.IconInlineSize()))
s.icon.Move(fyne.NewPos(
size.Width-theme.IconInlineSize()-theme.Padding()*2,
(size.Height-theme.IconInlineSize())/2))
}
func (s *selectRenderer) BackgroundColor() color.Color {
if s.combo.hovered || s.combo.tapped { // TODO tapped will be different to hovered when we have animation
return theme.HoverColor()
}
return theme.ButtonColor()
}
func (s *selectRenderer) Refresh() {
s.combo.propertyLock.RLock()
s.updateLabel()
s.updateIcon()
s.combo.propertyLock.RUnlock()
s.Layout(s.combo.Size())
canvas.Refresh(s.combo.super())
}
func (s *selectRenderer) updateLabel() {
s.label.Color = theme.TextColor()
s.label.TextSize = theme.TextSize()
if s.combo.PlaceHolder == "" {
s.combo.PlaceHolder = defaultPlaceHolder
}
if s.combo.Selected == "" {
s.label.Text = s.combo.PlaceHolder
} else {
s.label.Text = s.combo.Selected
}
}
func (s *selectRenderer) updateIcon() {
if false { // s.combo.down {
s.icon.Resource = theme.MenuDropUpIcon()
} else {
s.icon.Resource = theme.MenuDropDownIcon()
}
}
// Select widget has a list of options, with the current one shown, and triggers an event func when clicked
type Select struct {
BaseWidget
Selected string
Options []string
PlaceHolder string
OnChanged func(string) `json:"-"`
hovered, tapped bool
popUp *PopUpMenu
}
var _ fyne.Widget = (*Select)(nil)
// Hide hides the select.
// Implements: fyne.Widget
func (s *Select) Hide() {
if s.popUp != nil {
s.popUp.Hide()
s.popUp = nil
}
s.BaseWidget.Hide()
}
// Move changes the relative position of the select.
// Implements: fyne.Widget
func (s *Select) Move(pos fyne.Position) {
s.BaseWidget.Move(pos)
if s.popUp != nil {
s.popUp.Move(s.popUpPos())
}
}
// Resize sets a new size for a widget.
// Note this should not be used if the widget is being managed by a Layout within a Container.
func (s *Select) Resize(size fyne.Size) {
s.BaseWidget.Resize(size)
if s.popUp != nil {
s.popUp.Resize(fyne.NewSize(size.Width, s.popUp.MinSize().Height))
}
}
func (s *Select) optionTapped(text string) {
s.SetSelected(text)
s.popUp = nil
}
// Tapped is called when a pointer tapped event is captured and triggers any tap handler
func (s *Select) Tapped(*fyne.PointEvent) {
c := fyne.CurrentApp().Driver().CanvasForObject(s.super())
s.tapped = true
defer func() { // TODO move to a real animation
time.Sleep(time.Millisecond * buttonTapDuration)
s.tapped = false
s.Refresh()
}()
s.Refresh()
var items []*fyne.MenuItem
for _, option := range s.Options {
text := option // capture
item := fyne.NewMenuItem(option, func() {
s.optionTapped(text)
})
items = append(items, item)
}
s.popUp = newPopUpMenu(fyne.NewMenu("", items...), c)
s.popUp.ShowAtPosition(s.popUpPos())
s.popUp.Resize(fyne.NewSize(s.Size().Width, s.popUp.MinSize().Height))
}
func (s *Select) popUpPos() fyne.Position {
buttonPos := fyne.CurrentApp().Driver().AbsolutePositionForObject(s.super())
return buttonPos.Add(fyne.NewPos(0, s.Size().Height))
}
// MouseIn is called when a desktop pointer enters the widget
func (s *Select) MouseIn(*desktop.MouseEvent) {
s.hovered = true
s.Refresh()
}
// MouseOut is called when a desktop pointer exits the widget
func (s *Select) MouseOut() {
s.hovered = false
s.Refresh()
}
// MouseMoved is called when a desktop pointer hovers over the widget
func (s *Select) MouseMoved(*desktop.MouseEvent) {
}
// MinSize returns the size that this widget should not shrink below
func (s *Select) MinSize() fyne.Size {
s.ExtendBaseWidget(s)
return s.BaseWidget.MinSize()
}
// CreateRenderer is a private method to Fyne which links this widget to its renderer
func (s *Select) CreateRenderer() fyne.WidgetRenderer {
s.ExtendBaseWidget(s)
s.propertyLock.RLock()
defer s.propertyLock.RUnlock()
icon := NewIcon(theme.MenuDropDownIcon())
text := canvas.NewText(s.Selected, theme.TextColor())
if s.PlaceHolder == "" {
s.PlaceHolder = defaultPlaceHolder
}
if s.Selected == "" {
text.Text = s.PlaceHolder
}
text.Alignment = fyne.TextAlignLeading
objects := []fyne.CanvasObject{text, icon}
r := &selectRenderer{widget.NewShadowingRenderer(objects, widget.ButtonLevel), icon, text, s}
r.updateLabel()
r.updateIcon()
return r
}
// ClearSelected clears the current option of the select widget. After
// clearing the current option, the Select widget's PlaceHolder will
// be displayed.
func (s *Select) ClearSelected() {
s.updateSelected("")
}
// SetSelected sets the current option of the select widget
func (s *Select) SetSelected(text string) {
for _, option := range s.Options {
if text == option {
s.updateSelected(text)
}
}
}
func (s *Select) updateSelected(text string) {
s.Selected = text
if s.OnChanged != nil {
s.OnChanged(s.Selected)
}
s.Refresh()
}
// NewSelect creates a new select widget with the set list of options and changes handler
func NewSelect(options []string, changed func(string)) *Select {
s := &Select{BaseWidget{}, "", options, defaultPlaceHolder, changed, false, false, nil}
s.ExtendBaseWidget(s)
return s
}