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// Copyright 2019-2022 Graham Clark. All rights reserved. Use of this source
// code is governed by the MIT license that can be found in the LICENSE
// file.
// Package null provides a widget which does nothing and renders nothing.
package null
import (
"fmt"
"github.com/gcla/gowid"
)
//======================================================================
type Widget struct{}
func New() *Widget {
res := &Widget{}
var _ gowid.IWidget = res
return res
}
func (w *Widget) Selectable() bool {
return false
}
func (w *Widget) UserInput(ev interface{}, size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) bool {
return false
}
func (w *Widget) RenderSize(size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) gowid.IRenderBox {
cols, haveCols := size.(gowid.IColumns)
rows, haveRows := size.(gowid.IRows)
switch {
case haveCols && haveRows:
return gowid.RenderBox{C: cols.Columns(), R: rows.Rows()}
case haveCols:
return gowid.RenderBox{C: cols.Columns(), R: 0}
default:
return gowid.RenderBox{C: 0, R: 0}
}
}
func (w *Widget) Render(size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) gowid.ICanvas {
res := gowid.NewCanvasOfSize(0, 0)
gowid.MakeCanvasRightSize(res, size)
return res
}
func (w *Widget) String() string {
return fmt.Sprintf("null")
}
//======================================================================
// Local Variables:
// mode: Go
// fill-column: 110
// End:
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