A lot of layout work

wdgt_relative_layout.go

@@ -0,0 +1,160 @@
+/*
+Copyright © Brian Buller <brian@bullercodeworks.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+package widgets
+
+import (
+	"github.com/gdamore/tcell"
+)
+
+type RelativeLayout struct {
+	id              string
+	style           tcell.Style
+	widgetRelations map[Widget][]widgetRelation
+	widgets         []Widget
+
+	active   bool
+	visible  bool
+	tabbable bool
+
+	x, y int
+	w, h int
+}
+
+var _ Widget = (*RelativeLayout)(nil)
+
+type widgetRelation struct {
+	relation RelativeRelation
+	relTo    Widget
+}
+
+type RelativeRelation int
+
+const (
+	RelRelAbove     = iota // Above Widget
+	RelRelToRightOf        // To Right of Widget
+	RelRelBelow            // Below Widget
+	RelRelToLeftOf         // To Left of Widget
+	RelAncTL               // Anchored to parent Top-Left
+	RelAncT                // Anchored to parent Top
+	RelAncTR               // Anchored to parent Top-Right
+	RelAncL                // Anchored to parent Left
+	RelAncC                // Anchored to parent Center
+	RelAncR                // Anchored to parent Right
+	RelAncBL               // Anchored to parent Bottom-Left
+	RelAncB                // Anchored to parent Bottom
+	RelAncBR               // Anchored to parent Bottom-Right
+)
+
+func NewRelativeLayout(id string, s tcell.Style) *RelativeLayout {
+	ret := &RelativeLayout{}
+	ret.Init(id, s)
+	return ret
+}
+
+func (w *RelativeLayout) Init(id string, style tcell.Style) {
+	w.id = id
+	w.style = style
+	w.visible = true
+	w.tabbable = true
+}
+func (w *RelativeLayout) Id() string { return w.id }
+func (w *RelativeLayout) HandleResize(ev *tcell.EventResize) {
+	w.w, w.h = ev.Size()
+
+	// w.w = wh.Min(w.w, w.WantW())
+	// w.h = wh.Min(w.h, w.WantH())
+
+	// TODO: Trickle-down HandleResize
+}
+func (w *RelativeLayout) HandleKey(ev *tcell.EventKey) bool { return false }
+func (w *RelativeLayout) HandleTime(ev *tcell.EventTime)    {}
+func (w *RelativeLayout) Draw(screen tcell.Screen) {
+	if !w.visible {
+		return
+	}
+	// All widgets should have correct (relative) positions
+	/*
+		done := make(map[Widget]widgetRelation)
+		rem := make(map[Widget]widgetRelation)
+		for k, v := range w.widgetRelations {
+			if v.relTo == w {
+				done[k] = v
+			} else {
+				rem[k] = v
+			}
+		}
+	*/
+}
+
+func (w *RelativeLayout) Active() bool       { return w.active }
+func (w *RelativeLayout) SetActive(a bool)   { w.active = a }
+func (w *RelativeLayout) Visible() bool      { return w.visible }
+func (w *RelativeLayout) SetVisible(a bool)  { w.visible = a }
+func (w *RelativeLayout) Focusable() bool    { return true }
+func (w *RelativeLayout) SetTabbable(b bool) { w.tabbable = b }
+func (w *RelativeLayout) Tabbable() bool     { return w.tabbable }
+func (w *RelativeLayout) SetX(x int)         { w.x = x }
+func (w *RelativeLayout) SetY(y int)         { w.y = y }
+func (w *RelativeLayout) GetX() int          { return w.x }
+func (w *RelativeLayout) GetY() int          { return w.y }
+func (w *RelativeLayout) SetSize(c Coord)    { w.w, w.h = c.X, c.Y }
+func (w *RelativeLayout) GetPos() Coord      { return Coord{X: w.x, Y: w.y} }
+func (w *RelativeLayout) SetPos(c Coord)     { w.x, w.y = c.X, c.Y }
+func (w *RelativeLayout) SetW(wd int)        { w.w = wd }
+func (w *RelativeLayout) SetH(h int)         { w.h = h }
+func (w *RelativeLayout) GetW() int          { return w.w }
+func (w *RelativeLayout) GetH() int          { return w.h }
+func (w *RelativeLayout) WantW() int         { return 1 }
+func (w *RelativeLayout) WantH() int         { return 1 }
+func (w *RelativeLayout) MinW() int {
+	// Find the highest value for x in all widgets GetX() + MinW()
+	var minW int
+	for _, wd := range w.widgets {
+		wrk := wd.GetX() + wd.MinW()
+		if wrk > minW {
+			minW = wrk
+		}
+	}
+	return minW
+}
+
+func (w *RelativeLayout) MinH() int {
+	// Find the highest value for y in all widgets GetY() + MinH()
+	var minH int
+	for _, wd := range w.widgets {
+		wrk := wd.GetY() + wd.MinH()
+		if wrk > minH {
+			minH = wrk
+		}
+	}
+	return minH
+}
+
+func (w *RelativeLayout) Add(n Widget, relTo Widget, relation RelativeRelation) {
+	w.widgetRelations[n] = append(w.widgetRelations[n], widgetRelation{
+		relation: relation,
+		relTo:    relTo,
+	})
+}
+
+func (w *RelativeLayout) AddRelation(n Widget, relation RelativeRelation, relTo Widget) {
+}