/
menu_item.go
199 lines (169 loc) · 4.68 KB
/
menu_item.go
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package widget
import (
"image/color"
"fyne.io/fyne"
"fyne.io/fyne/canvas"
"fyne.io/fyne/driver/desktop"
"fyne.io/fyne/internal/widget"
"fyne.io/fyne/theme"
)
var _ fyne.Widget = (*menuItem)(nil)
// menuItem is a widget for displaying a fyne.menuItem.
type menuItem struct {
widget.Base
Item *fyne.MenuItem
Parent *Menu
child *Menu
hovered bool
onActivateChild func(*menuItem)
}
// newMenuItem creates a new menuItem.
func newMenuItem(item *fyne.MenuItem, parent *Menu, onActivateChild func(*menuItem)) *menuItem {
return &menuItem{Item: item, Parent: parent, onActivateChild: onActivateChild}
}
func (i *menuItem) Child() *Menu {
if i.Item.ChildMenu != nil && i.child == nil {
child := NewMenu(i.Item.ChildMenu)
child.Hide()
child.OnDismiss = i.Parent.Dismiss
i.child = child
}
return i.child
}
// CreateRenderer returns a new renderer for the menu item.
//
// Implements: fyne.Widget
func (i *menuItem) CreateRenderer() fyne.WidgetRenderer {
text := canvas.NewText(i.Item.Label, theme.TextColor())
objects := []fyne.CanvasObject{text}
var icon *canvas.Image
if i.Item.ChildMenu != nil {
icon = canvas.NewImageFromResource(theme.MenuExpandIcon())
objects = append(objects, icon)
}
return &menuItemRenderer{
BaseRenderer: widget.NewBaseRenderer(objects),
i: i,
icon: icon,
text: text,
}
}
// Hide hides the menu item.
//
// Implements: fyne.Widget
func (i *menuItem) Hide() {
widget.HideWidget(&i.Base, i)
}
// MinSize returns the minimal size of the menu item.
//
// Implements: fyne.Widget
func (i *menuItem) MinSize() fyne.Size {
return widget.MinSizeOf(i)
}
// MouseIn changes the item to be hovered and shows the submenu if the item has one.
// The submenu of any sibling of the item will be hidden.
//
// Implements: desktop.Hoverable
func (i *menuItem) MouseIn(*desktop.MouseEvent) {
i.hovered = true
i.onActivateChild(i)
i.Refresh()
}
// MouseMoved does nothing.
//
// Implements: desktop.Hoverable
func (i *menuItem) MouseMoved(*desktop.MouseEvent) {
}
// MouseOut changes the item to not be hovered but has no effect on the visibility of the item's submenu.
//
// Implements: desktop.Hoverable
func (i *menuItem) MouseOut() {
i.hovered = false
i.Refresh()
}
// Move sets the position of the widget relative to its parent.
//
// Implements: fyne.Widget
func (i *menuItem) Move(pos fyne.Position) {
widget.MoveWidget(&i.Base, i, pos)
}
// Refresh triggers a redraw of the menu item.
//
// Implements: fyne.Widget
func (i *menuItem) Refresh() {
widget.RefreshWidget(i)
}
// Resize changes the size of the menu item.
//
// Implements: fyne.Widget
func (i *menuItem) Resize(size fyne.Size) {
widget.ResizeWidget(&i.Base, i, size)
}
// Show makes the menu item visible.
//
// Implements: fyne.Widget
func (i *menuItem) Show() {
widget.ShowWidget(&i.Base, i)
}
// Tapped performs the action of the item and dismisses the menu.
// It does nothing if the item doesn’t have an action.
//
// Implements: fyne.Tappable
func (i *menuItem) Tapped(*fyne.PointEvent) {
if i.Item.Action == nil {
if fyne.CurrentDevice().IsMobile() {
i.onActivateChild(i)
}
return
}
i.Parent.Dismiss()
i.Item.Action()
}
type menuItemRenderer struct {
widget.BaseRenderer
i *menuItem
icon *canvas.Image
lastThemePadding int
minSize fyne.Size
text *canvas.Text
}
func (r *menuItemRenderer) BackgroundColor() color.Color {
if !fyne.CurrentDevice().IsMobile() && (r.i.hovered || (r.i.child != nil && r.i.child.Visible())) {
return theme.HoverColor()
}
return color.Transparent
}
func (r *menuItemRenderer) Layout(size fyne.Size) {
padding := r.itemPadding()
r.text.TextSize = theme.TextSize()
r.text.Color = theme.TextColor()
r.text.Resize(r.text.MinSize())
r.text.Move(fyne.NewPos(padding.Width/2, padding.Height/2))
if r.icon != nil {
r.icon.Resize(fyne.NewSize(theme.IconInlineSize(), theme.IconInlineSize()))
r.icon.Move(fyne.NewPos(size.Width-theme.IconInlineSize(), (size.Height-theme.IconInlineSize())/2))
}
}
func (r *menuItemRenderer) MinSize() fyne.Size {
if r.minSizeUnchanged() {
return r.minSize
}
minSize := r.text.MinSize().Add(r.itemPadding())
if r.icon != nil {
minSize = minSize.Add(fyne.NewSize(theme.IconInlineSize(), 0))
}
r.minSize = minSize
return r.minSize
}
func (r *menuItemRenderer) Refresh() {
canvas.Refresh(r.i)
}
func (r *menuItemRenderer) minSizeUnchanged() bool {
return !r.minSize.IsZero() &&
r.text.TextSize == theme.TextSize() &&
(r.icon == nil || r.icon.Size().Width == theme.IconInlineSize()) &&
r.lastThemePadding == theme.Padding()
}
func (r *menuItemRenderer) itemPadding() fyne.Size {
return fyne.NewSize(theme.Padding()*4, theme.Padding()*2)
}