Add transparent centering to widget

This commit is contained in:
Tulir Asokan 2018-05-21 18:21:35 +03:00
parent e079f76157
commit cbbec5bd18

View File

@ -18,17 +18,53 @@ package widget
import (
"maunium.net/go/tview"
"maunium.net/go/tcell"
)
// Center wraps the given tview primitive into a Flex element in order to
// vertically and horizontally center the given primitive.
func Center(width, height int, p tview.Primitive) tview.Primitive {
return tview.NewFlex().
AddItem(tview.NewBox(), 0, 1, false).
AddItem(nil, 0, 1, false).
AddItem(tview.NewFlex().
SetDirection(tview.FlexRow).
AddItem(tview.NewBox(), 0, 1, false).
AddItem(nil, 0, 1, false).
AddItem(p, height, 1, true).
AddItem(tview.NewBox(), 0, 1, false), width, 1, true).
AddItem(tview.NewBox(), 0, 1, false)
AddItem(nil, 0, 1, false), width, 1, true).
AddItem(nil, 0, 1, false)
}
type transparentCenter struct {
*tview.Box
prefWidth, prefHeight int
p tview.Primitive
}
func TransparentCenter(width, height int, p tview.Primitive) tview.Primitive {
return &transparentCenter{
Box: tview.NewBox(),
prefWidth: width,
prefHeight: height,
p: p,
}
}
func (tc *transparentCenter) Draw(screen tcell.Screen) {
x, y, width, height := tc.GetRect()
if width > tc.prefWidth {
x += (width - tc.prefWidth) / 2
width = tc.prefWidth
}
if height > tc.prefHeight {
y += (height - tc.prefHeight) / 2
height = tc.prefHeight
}
tc.p.SetRect(x, y, width, height)
tc.p.Draw(screen)
}
func (tc *transparentCenter) Focus(delegate func(p tview.Primitive)) {
if delegate != nil {
delegate(tc.p)
}
}