56 lines
1.4 KiB
Go
56 lines
1.4 KiB
Go
package actions
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import (
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"github.com/gotk3/gotk3/glib"
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"github.com/gotk3/gotk3/gtk"
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)
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type MenuButton struct {
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*gtk.MenuButton
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lastsig glib.SignalHandle
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lastmod *glib.MenuModel
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}
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func NewMenuButton() *MenuButton {
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b, _ := gtk.MenuButtonNew()
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b.SetSensitive(false)
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return &MenuButton{
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MenuButton: b,
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}
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}
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// Bind binds the given menu. The menu's prefix MUST be a constant for this
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// instance of the MenuButton.
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func (m *MenuButton) Bind(menu *Menu) {
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prefix, model := menu.MenuModel()
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// Insert the action group into the menu. This will only override the old
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// action group, as the prefix is a constant for this instance.
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m.MenuButton.InsertActionGroup(prefix, menu)
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// Only after we have inserted the action group can we set the model that
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// menu has. This tells Gtk to look for the menu actions inside the inserted
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// group.
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m.MenuButton.SetMenuModel(model)
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// Unbind the last handler if we have one.
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if m.lastmod != nil {
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m.lastmod.HandlerDisconnect(m.lastsig)
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}
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// Set the current model as the last one for future calls.
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if m.lastmod = model; m.lastmod != nil {
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// If we have a model, then only activate the button when we have any
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// menu items.
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m.SetSensitive(model.GetNItems() > 0)
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// Subscribe the button to menu update events.
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m.lastsig, _ = model.Connect("items-changed", func() {
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m.SetSensitive(model.GetNItems() > 0)
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})
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} else {
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// Else, don't allow the button to be clicked at all.
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m.SetSensitive(false)
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}
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}
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