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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 palettemap provides a widget that can change the color and style of an inner widget.
package palettemap
import (
"fmt"
"github.com/gcla/gowid"
)
//======================================================================
type IPaletteMapper interface {
GetMappedColor(string) (string, bool)
}
type Map map[string]string
func (p Map) GetMappedColor(key string) (x string, y bool) {
x, y = p[key]
return
}
type IPaletteMap interface {
FocusMap() IPaletteMapper
NotFocusMap() IPaletteMapper
}
type IWidget interface {
gowid.ICompositeWidget
IPaletteMap
}
// Widget that adjusts the palette used - if the rendering context provides for a foreground
// color of red (when focused), this widget can provide a map from red -> green to change its
// display
type Widget struct {
gowid.IWidget
focusMap IPaletteMapper
notFocusMap IPaletteMapper
*gowid.Callbacks
gowid.SubWidgetCallbacks
}
func New(inner gowid.IWidget, focusMap Map, notFocusMap Map) *Widget {
res := &Widget{
IWidget: inner,
focusMap: focusMap,
notFocusMap: notFocusMap,
}
res.SubWidgetCallbacks = gowid.SubWidgetCallbacks{CB: &res.Callbacks}
var _ gowid.IWidget = res
var _ gowid.ICompositeWidget = res
var _ IWidget = res
return res
}
func (w *Widget) String() string {
return fmt.Sprintf("palettemap[%v]", w.SubWidget())
}
func (w *Widget) SubWidget() gowid.IWidget {
return w.IWidget
}
func (w *Widget) SetSubWidget(inner gowid.IWidget, app gowid.IApp) {
w.IWidget = inner
gowid.RunWidgetCallbacks(w, gowid.SubWidgetCB{}, app, w)
}
func (w *Widget) FocusMap() IPaletteMapper {
return w.focusMap
}
func (w *Widget) NotFocusMap() IPaletteMapper {
return w.notFocusMap
}
func (w *Widget) SubWidgetSize(size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) gowid.IRenderSize {
return w.SubWidget().RenderSize(size, focus, app)
}
func (w *Widget) RenderSize(size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) gowid.IRenderBox {
return w.SubWidget().RenderSize(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) UserInput(ev interface{}, size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) bool {
return gowid.UserInputIfSelectable(w.IWidget, ev, size, focus, app)
}
//''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
func Render(w IWidget, size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) gowid.ICanvas {
newAttrs := make(gowid.Palette)
var mapToUse IPaletteMapper
if focus.Focus {
mapToUse = w.FocusMap()
} else {
mapToUse = w.NotFocusMap()
}
// walk through palette, making a copy with changes as dictated by either the focus map or
// not-focus map.
app.RangeOverPalette(func(k string, v gowid.ICellStyler) bool {
done := false
if newk, ok := mapToUse.GetMappedColor(k); ok {
if newval, ok := app.CellStyler(newk); ok {
newAttrs[k] = newval
done = true
}
}
if !done {
newAttrs[k] = v
}
return true
})
override := NewOverride(app, &newAttrs)
res := w.SubWidget().Render(size, focus, override)
return res
}
//======================================================================
type PaletteOverride struct {
gowid.IApp
Palette gowid.IPalette
}
func NewOverride(app gowid.IApp, newattrs gowid.IPalette) *PaletteOverride {
return &PaletteOverride{
IApp: app,
Palette: newattrs,
}
}
func (a *PaletteOverride) CellStyler(name string) (gowid.ICellStyler, bool) {
p, ok := a.Palette.CellStyler(name)
if ok {
return p, ok
}
return a.IApp.CellStyler(name)
}
func (a *PaletteOverride) RangeOverPalette(f func(k string, v gowid.ICellStyler) bool) {
a.Palette.RangeOverPalette(f)
}
//======================================================================
// Local Variables:
// mode: Go
// fill-column: 110
// End:
|
