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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 boxadapter provides a widget that will allow a box widget to be used
// in a flow context. Based on urwid's BoxAdapter - http://urwid.org/reference/widget.html#boxadapter.
package boxadapter
import (
"fmt"
"github.com/gcla/gowid"
tcell "github.com/gdamore/tcell/v2"
)
//======================================================================
type Widget struct {
gowid.IWidget
rows int
*gowid.Callbacks
gowid.SubWidgetCallbacks
}
type IBoxAdapter interface {
Rows() int
}
type IBoxAdapterWidget interface {
gowid.ICompositeWidget
IBoxAdapter
}
func New(inner gowid.IWidget, rows int) *Widget {
res := &Widget{
IWidget: inner,
rows: rows,
}
res.SubWidgetCallbacks = gowid.SubWidgetCallbacks{CB: &res.Callbacks}
var _ gowid.IWidget = res
var _ gowid.IComposite = res
var _ IBoxAdapter = res
return res
}
func (w *Widget) String() string {
return fmt.Sprintf("boxadapter[%v]", w.SubWidget())
}
func (w *Widget) SubWidget() gowid.IWidget {
return w.IWidget
}
func (w *Widget) SetSubWidget(wi gowid.IWidget, app gowid.IApp) {
w.IWidget = wi
gowid.RunWidgetCallbacks(w, gowid.SubWidgetCB{}, app, w)
}
func (w *Widget) Rows() int {
return w.rows
}
func (w *Widget) SetRows(rows int, app gowid.IApp) {
w.rows = rows
}
func (w *Widget) RenderSize(size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) gowid.IRenderBox {
return RenderSize(w, size, focus, app)
}
func (w *Widget) Render(size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) gowid.ICanvas {
return Render(w, size, focus, app)
}
func (w *Widget) SubWidgetSize(size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) gowid.IRenderSize {
return SubWidgetSize(w, size, focus, app)
}
func (w *Widget) UserInput(ev interface{}, size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) bool {
return UserInput(w, ev, size, focus, app)
}
//======================================================================
// SubWidgetSize is the same as RenderSize for this widget - the inner widget will
// be rendered as a box with the specified number of columns and the widget's
// set number of rows.
func SubWidgetSize(w IBoxAdapter, size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) gowid.IRenderSize {
return RenderSize(w, size, focus, app)
}
func RenderSize(w IBoxAdapter, size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) gowid.IRenderBox {
switch sz := size.(type) {
case gowid.IRenderFlowWith:
return gowid.RenderBox{
C: sz.FlowColumns(),
R: w.Rows(),
}
default:
panic(gowid.WidgetSizeError{Widget: w, Size: size, Required: "gowid.IRenderFlow"})
}
}
func Render(w IBoxAdapterWidget, size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) gowid.ICanvas {
rsize := RenderSize(w, size, focus, app)
res := w.SubWidget().Render(rsize, focus, app)
return res
}
// Ensure that a valid mouse interaction with a flow widget will result in a
// mouse interaction with the subwidget
func UserInput(w IBoxAdapterWidget, ev interface{}, size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) bool {
if _, ok := size.(gowid.IRenderFlowWith); !ok {
panic(gowid.WidgetSizeError{Widget: w, Size: size, Required: "gowid.IRenderFlow"})
}
box := RenderSize(w, size, focus, app)
if evm, ok := ev.(*tcell.EventMouse); ok {
_, my := evm.Position()
if my < box.BoxRows() && my >= 0 {
return gowid.UserInputIfSelectable(w.SubWidget(), ev, box, focus, app)
}
} else {
return gowid.UserInputIfSelectable(w.SubWidget(), ev, box, focus, app)
}
return false
}
//======================================================================
// Local Variables:
// mode: Go
// fill-column: 110
// End:
|
