327 lines
8.8 KiB
Go
327 lines
8.8 KiB
Go
/*
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Copyright © Brian Buller <brian@bullercodeworks.com>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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package widgets
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import (
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"github.com/gdamore/tcell"
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)
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type AbsoluteLayout struct {
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id string
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style tcell.Style
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x, y int
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w, h int
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widgets []Widget
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wCoords map[Widget]Coord
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wAnchor map[Widget]AbsoluteAnchor
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wManualSizes map[Widget]Coord
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defAnchor AbsoluteAnchor
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active bool
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visible bool
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focusable bool
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keyMap KeyMap
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cursor int
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disableTab bool
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logger func(string)
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}
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type AbsoluteAnchor int
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const (
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AnchorTL = AbsoluteAnchor(iota) // widget starts at <startX>, <startY>
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AnchorT // widget starts at <middleX>-<widget width/2>, <startY>
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AnchorTR // widget starts at <endX>, <startY>
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AnchorL // widget starts at <startX>, <middleY>
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AnchorC // widget starts at <middleX>-<widget width/2>, <middleY>-<widget height/2>
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AnchorR // widget starts at <endX>-<widget width>, <middleY>-<widget height/2>
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AnchorBL // widget starts at <startX>, <endY>-<widget height>
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AnchorB // widget starts at <middleX>-<widget width/2>, <endY>-<widget height>
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AnchorBR // widget starts at <endX>-<widget width>, <endY>-<widget height>
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AnchorErr
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)
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var _ Widget = (*AbsoluteLayout)(nil)
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func NewAbsoluteLayout(id string, s tcell.Style) *AbsoluteLayout {
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ret := &AbsoluteLayout{}
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ret.Init(id, s)
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return ret
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}
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func (w *AbsoluteLayout) Init(id string, s tcell.Style) {
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w.id = id
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w.style = s
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w.visible = true
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w.defAnchor = AnchorTL
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w.keyMap = BlankKeyMap()
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w.wCoords = make(map[Widget]Coord)
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w.wAnchor = make(map[Widget]AbsoluteAnchor)
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w.wManualSizes = make(map[Widget]Coord)
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w.focusable = true
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}
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func (w *AbsoluteLayout) Id() string { return w.id }
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func (w *AbsoluteLayout) HandleResize(ev *tcell.EventResize) {
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w.w, w.h = ev.Size()
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w.updateWidgetLayouts()
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}
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func (w *AbsoluteLayout) SetKeyMap(km KeyMap) { w.keyMap = km }
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func (w *AbsoluteLayout) AddToKeyMap(km KeyMap) { w.keyMap.Merge(km) }
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func (w *AbsoluteLayout) RemoveFromKeyMap(km KeyMap) {
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for k := range km.Keys {
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w.keyMap.Remove(k)
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}
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for r := range km.Runes {
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w.keyMap.RemoveRune(r)
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}
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}
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func (w *AbsoluteLayout) HandleKey(ev *tcell.EventKey) bool {
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if !w.disableTab && ev.Key() == tcell.KeyTab {
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fndP := -1
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for i := w.cursor; i < len(w.widgets); i++ {
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if fndP == -1 {
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if w.widgets[i].Active() {
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fndP = i
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w.widgets[i].SetActive(false)
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continue
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}
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} else {
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if w.widgets[i].Focusable() {
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w.widgets[i].SetActive(true)
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return true
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}
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}
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}
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// If we're here, we hit the end.
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if fndP == -1 { // But didn't even find the start
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return false
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}
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for i := 0; i < fndP; i++ {
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if w.widgets[i].Focusable() {
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w.widgets[i].SetActive(true)
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return true
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}
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}
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return false
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}
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for _, wi := range w.widgets {
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if wi.HandleKey(ev) {
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return true
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}
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}
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return false
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}
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func (w *AbsoluteLayout) HandleTime(ev *tcell.EventTime) {
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for _, wi := range w.widgets {
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wi.HandleTime(ev)
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}
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}
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func (w *AbsoluteLayout) Draw(screen tcell.Screen) {
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if !w.visible {
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return
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}
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p := w.GetPos()
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for _, wd := range w.widgets {
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p.DrawOffset(wd, screen)
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}
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}
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func (w *AbsoluteLayout) Active() bool { return w.active }
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func (w *AbsoluteLayout) SetActive(a bool) { w.active = a }
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func (w *AbsoluteLayout) Visible() bool { return w.visible }
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func (w *AbsoluteLayout) SetVisible(a bool) { w.visible = a }
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func (w *AbsoluteLayout) Focusable() bool { return w.focusable }
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func (w *AbsoluteLayout) SetFocusable(b bool) { w.focusable = b }
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func (w *AbsoluteLayout) SetX(x int) { w.x = x }
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func (w *AbsoluteLayout) SetY(y int) { w.y = y }
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func (w *AbsoluteLayout) GetX() int { return w.x }
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func (w *AbsoluteLayout) GetY() int { return w.y }
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func (w *AbsoluteLayout) GetPos() Coord { return Coord{X: w.x, Y: w.y} }
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func (w *AbsoluteLayout) SetPos(c Coord) { w.x, w.y = c.X, c.Y }
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func (w *AbsoluteLayout) GetW() int { return w.w }
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func (w *AbsoluteLayout) GetH() int { return w.h }
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func (w *AbsoluteLayout) SetW(wd int) { w.w = wd }
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func (w *AbsoluteLayout) SetH(h int) { w.h = h }
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func (w *AbsoluteLayout) SetSize(c Coord) { w.w, w.h = c.X, c.Y }
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func (w *AbsoluteLayout) WantW() int { return w.w }
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func (w *AbsoluteLayout) WantH() int { return w.h }
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func (w *AbsoluteLayout) MinW() int {
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// Find the highest value for x in all widgets GetX() + MinW()
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var minW int
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for _, wd := range w.widgets {
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wrk := wd.GetX() + wd.MinW()
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if wrk > minW {
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minW = wrk
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}
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}
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return minW
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}
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func (w *AbsoluteLayout) MinH() int {
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// Find the highest value for y in all widgets GetY() + MinH()
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var minH int
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for _, wd := range w.widgets {
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wrk := wd.GetY() + wd.MinH()
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if wrk > minH {
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minH = wrk
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}
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}
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return minH
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}
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// Add a widget at x/y
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func (w *AbsoluteLayout) Add(n Widget, pos Coord) { w.AddAnchored(n, pos, w.defAnchor) }
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func (w *AbsoluteLayout) AddAnchored(n Widget, pos Coord, anchor AbsoluteAnchor) {
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w.widgets = append(w.widgets, n)
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w.wCoords[n] = pos
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w.wAnchor[n] = anchor
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w.updateWidgetLayouts()
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}
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func (w *AbsoluteLayout) Clear() {
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w.widgets = []Widget{}
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w.wCoords = make(map[Widget]Coord)
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}
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func (w *AbsoluteLayout) SetDefaultAnchor(d AbsoluteAnchor) {
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if d < 0 || d > AnchorErr {
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d = AnchorTL
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}
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w.defAnchor = d
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}
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func (w *AbsoluteLayout) SetLogger(l func(string)) { w.logger = l }
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func (w *AbsoluteLayout) Log(txt string) {
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if w.logger != nil {
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w.logger(txt)
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}
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}
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func (w *AbsoluteLayout) updateWidgetLayouts() {
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// In an Absolute Layout, widgets are given a definite position and anchor.
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// The anchor is a side of the layout (see AbsoluteAnchor type)
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for _, wd := range w.widgets {
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w.updateWidgetPos(wd)
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w.updateWidgetSize(wd)
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}
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}
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func (w *AbsoluteLayout) updateWidgetSize(wd Widget) {
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if sz, ok := w.wManualSizes[wd]; ok {
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wd.SetW(sz.X)
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wd.SetH(sz.Y)
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return
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}
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// The available space is:
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// X: Layout Width - Widget X
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// Y: Layout Height - Widget Y
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available := Coord{X: w.GetW() - wd.GetX(), Y: w.GetH() - wd.GetY()}
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ww := wd.WantW()
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if ww < available.X {
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wd.SetW(ww)
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} else if wd.MinW() < available.X {
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wd.SetW(available.X)
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} else {
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wd.SetW(wd.MinW())
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}
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wh := wd.WantH()
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if wh < available.Y {
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wd.SetH(wh)
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} else if wd.MinH() < available.Y {
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wd.SetH(available.Y)
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} else {
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wd.SetH(wd.MinH())
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}
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}
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// Set a widgets position relative to the layout
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func (w *AbsoluteLayout) updateWidgetPos(wd Widget) { wd.SetPos(w.getRelPos(wd)) }
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// Manually set the size of a widget, the Layout won't override it
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func (w *AbsoluteLayout) SetWidgetSize(wd Widget, sz Coord) { w.wManualSizes[wd] = sz }
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func (w *AbsoluteLayout) ShrinkWrap(wd Widget) {
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w.SetWidgetSize(wd, Coord{X: wd.MinW(), Y: wd.MinH()})
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}
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func (w *AbsoluteLayout) getRelPos(wd Widget) Coord {
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var p Coord
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var a AbsoluteAnchor
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var ok bool
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if p, ok = w.wCoords[wd]; !ok {
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// Default to top-left corner
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p = Coord{X: 0, Y: 0}
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}
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if a, ok = w.wAnchor[wd]; !ok {
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a = w.defAnchor
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}
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midX, midY := (w.w / 2), (w.h / 2)
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switch a {
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case AnchorTL:
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return p
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case AnchorT:
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return p.Add(Coord{X: midX - (wd.GetW() / 2), Y: 0})
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case AnchorTR:
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return p.Add(Coord{X: w.w - wd.GetW(), Y: 0})
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case AnchorL:
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return p.Add(Coord{X: 0, Y: midY - (wd.GetH() / 2)})
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case AnchorC:
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return p.Add(Coord{X: midX - (wd.GetW() / 2), Y: midY - (wd.GetH() / 2)})
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case AnchorR:
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return p.Add(Coord{X: w.w - wd.GetW(), Y: midY - (wd.GetH() / 2)})
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case AnchorBR:
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return p.Add(Coord{X: w.w - wd.GetW(), Y: w.h - wd.GetH()})
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case AnchorB:
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return p.Add(Coord{X: midX - (wd.GetW() / 2), Y: w.h - wd.GetH()})
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case AnchorBL:
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return p.Add(Coord{X: 0, Y: w.h - wd.GetH()})
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}
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return p
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}
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func (w *AbsoluteLayout) getAbsPos(wd Widget) Coord {
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rel := w.getRelPos(wd)
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return rel.Add(Coord{X: w.x, Y: w.y})
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}
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