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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 hpadding provides a widget that pads an inner widget on the left and right.
package hpadding
import (
"fmt"
"github.com/gcla/gowid"
"github.com/gcla/gowid/gwutil"
tcell "github.com/gdamore/tcell/v2"
)
//======================================================================
type IWidget interface {
gowid.ICompositeWidget
Align() gowid.IHAlignment
Width() gowid.IWidgetDimension
}
// Widget renders the wrapped widget with the provided
// width; if the wrapped widget is a box, or the wrapped widget is to be
// packed to a width smaller than specified, the wrapped widget can be
// aligned in the middle, left or right
type Widget struct {
gowid.IWidget
alignment gowid.IHAlignment
width gowid.IWidgetDimension
*gowid.Callbacks
gowid.FocusCallbacks
gowid.SubWidgetCallbacks
}
func New(inner gowid.IWidget, alignment gowid.IHAlignment, width gowid.IWidgetDimension) *Widget {
res := &Widget{
IWidget: inner,
alignment: alignment,
width: width,
}
res.FocusCallbacks = gowid.FocusCallbacks{CB: &res.Callbacks}
res.SubWidgetCallbacks = gowid.SubWidgetCallbacks{CB: &res.Callbacks}
var _ gowid.IWidget = res
return res
}
func (w *Widget) String() string {
return fmt.Sprintf("hpad[%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.Callbacks, gowid.SubWidgetCB{}, app, w)
}
func (w *Widget) OnSetAlign(f gowid.IWidgetChangedCallback) {
gowid.AddWidgetCallback(w.Callbacks, gowid.HAlignCB{}, f)
}
func (w *Widget) RemoveOnSetAlign(f gowid.IIdentity) {
gowid.RemoveWidgetCallback(w.Callbacks, gowid.HAlignCB{}, f)
}
func (w *Widget) Align() gowid.IHAlignment {
return w.alignment
}
func (w *Widget) SetAlign(i gowid.IHAlignment, app gowid.IApp) {
w.alignment = i
gowid.RunWidgetCallbacks(w.Callbacks, gowid.HAlignCB{}, app, w)
}
func (w *Widget) OnSetHeight(f gowid.IWidgetChangedCallback) {
gowid.AddWidgetCallback(w.Callbacks, gowid.WidthCB{}, f)
}
func (w *Widget) RemoveOnSetHeight(f gowid.IIdentity) {
gowid.RemoveWidgetCallback(w.Callbacks, gowid.WidthCB{}, f)
}
func (w *Widget) Width() gowid.IWidgetDimension {
return w.width
}
func (w *Widget) SetWidth(i gowid.IWidgetDimension, app gowid.IApp) {
w.width = i
gowid.RunWidgetCallbacks(w.Callbacks, gowid.WidthCB{}, app, w)
}
func (w *Widget) SubWidgetSize(size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) gowid.IRenderSize {
return SubWidgetSize(w, size, focus, app)
}
func (w *Widget) RenderSize(size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) gowid.IRenderBox {
return gowid.CalculateRenderSizeFallback(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) UserInput(ev interface{}, size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) bool {
return UserInput(w, ev, size, focus, app)
}
//''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
func SubWidgetSize(w IWidget, size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) gowid.IRenderSize {
size2 := size
// If there is a horizontal offset specified, the relative features should reduce the size of the
// supplied size i.e. it should be relative to the reduced screen size
switch al := w.Align().(type) {
case gowid.HAlignLeft:
switch s := size.(type) {
case gowid.IRenderBox:
size2 = gowid.RenderBox{C: s.BoxColumns() - (al.Margin + al.MarginRight), R: s.BoxRows()}
case gowid.IRenderFlowWith:
size2 = gowid.RenderFlowWith{C: s.FlowColumns() - (al.Margin + al.MarginRight)}
default:
}
default:
}
return gowid.ComputeHorizontalSubSizeUnsafe(size2, w.Width())
}
func Render(w IWidget, size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) gowid.ICanvas {
subSize := w.SubWidgetSize(size, focus, app)
c := w.SubWidget().Render(subSize, focus, app)
subWidgetMaxColumn := c.BoxColumns()
var myCols int
if cols, ok := size.(gowid.IColumns); ok {
myCols = cols.Columns()
} else {
myCols = subWidgetMaxColumn
}
if myCols < subWidgetMaxColumn {
// TODO - bad, mandates trimming on right
c.TrimRight(myCols)
} else if myCols > subWidgetMaxColumn {
switch al := w.Align().(type) {
case gowid.HAlignRight:
c.ExtendLeft(gowid.EmptyLine(myCols - subWidgetMaxColumn))
case gowid.HAlignLeft:
l := gwutil.Min(al.Margin, myCols-subWidgetMaxColumn)
r := myCols - (l + subWidgetMaxColumn)
c.ExtendRight(gowid.EmptyLine(r))
c.ExtendLeft(gowid.EmptyLine(l))
default: // middle
r := (myCols - subWidgetMaxColumn) / 2
l := myCols - (subWidgetMaxColumn + r)
c.ExtendRight(gowid.EmptyLine(r))
c.ExtendLeft(gowid.EmptyLine(l))
}
}
gowid.MakeCanvasRightSize(c, size)
return c
}
// UserInput will adjust the input event's x coordinate depending on the input size
// and widget alignment. If the input is e.g. IRenderFixed, then no adjustment is
// made.
func UserInput(w IWidget, ev interface{}, size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) bool {
subSize := w.SubWidgetSize(size, focus, app)
ss := w.SubWidget().RenderSize(subSize, focus, app)
cols := ss.BoxColumns()
cols2, ok := size.(gowid.IColumns)
var xd int
if ok {
switch al := w.Align().(type) {
case gowid.HAlignRight:
xd = -(cols2.Columns() - cols)
case gowid.HAlignMiddle:
r := (cols2.Columns() - cols) / 2
l := cols2.Columns() - (cols + r)
xd = -l
case gowid.HAlignLeft:
if al.Margin+cols <= cols2.Columns() {
xd = -al.Margin
} else {
xd = -gwutil.Max(0, cols2.Columns()-cols)
}
}
}
newev := gowid.TranslatedMouseEvent(ev, xd, 0)
// TODO - don't need to translate event for keyboard event...
if evm, ok := newev.(*tcell.EventMouse); ok {
mx, _ := evm.Position()
if mx >= 0 && mx < cols {
return gowid.UserInputIfSelectable(w.SubWidget(), newev, subSize, focus, app)
}
} else {
return gowid.UserInputIfSelectable(w.SubWidget(), newev, subSize, focus, app)
}
return false
}
//======================================================================
// Local Variables:
// mode: Go
// fill-column: 110
// End:
|
