First Commit

relative_layout.go

@@ -0,0 +1,108 @@
+/*
+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
+
+	active  bool
+	visible bool
+	x, y    int
+	w, h    int
+}
+
+var _ Widget = (*RelativeLayout)(nil)
+
+type widgetRelation struct {
+	relation RelativeRelation
+	relTo    Widget
+}
+
+type RelativeRelation int
+
+const (
+	RRAbove     = iota // Above Widget
+	RRToRightOf        // To Right of Widget
+	RRBelow            // Below Widget
+	RRToLeftOf         // To Left of Widget
+	RATop              // Anchored to parent Top
+	RARight            // Anchored to parent Right
+	RABottom           // Anchored to parent Bottom
+	RALeft             // Anchored to parent Left
+)
+
+func NewRelativeLayout(id string, s tcell.Style) *RelativeLayout {
+	ret := &RelativeLayout{style: s}
+	ret.Init(id)
+	return ret
+}
+
+func (w *RelativeLayout) Init(id string) {
+	w.id = id
+	w.visible = true
+}
+func (w *RelativeLayout) Id() string                         { return w.id }
+func (w *RelativeLayout) HandleResize(ev *tcell.EventResize) {}
+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
+	}
+	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) 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) 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) SetSize(c Coord)   { w.w, w.h = c.X, c.Y }
+
+func (w *RelativeLayout) Add(n Widget, relTo Widget, relation RelativeRelation) {
+	w.widgetRelations[n] = widgetRelation{
+		relation: relation,
+		relTo:    relTo,
+	}
+}