338 lines
8.0 KiB
Go
338 lines
8.0 KiB
Go
package ui
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"git.kirsle.net/apps/doodle/lib/render"
|
|
)
|
|
|
|
// Pack provides configuration fields for Frame.Pack().
|
|
type Pack struct {
|
|
// Side of the parent to anchor the position to, like N, SE, W. Default
|
|
// is Center.
|
|
Anchor Anchor
|
|
Side Side
|
|
|
|
// If the widget is smaller than its allocated space, grow the widget
|
|
// to fill its space in the Frame.
|
|
Fill string // "x", "y", "both" or "" for none
|
|
fillX bool
|
|
fillY bool
|
|
|
|
Padding int32 // Equal padding on X and Y.
|
|
PadX int32
|
|
PadY int32
|
|
Expand bool // Widget should grow its allocated space to better fill the parent.
|
|
}
|
|
|
|
// Pack a widget along a side of the frame.
|
|
func (w *Frame) Pack(child Widget, config ...Pack) {
|
|
var C Pack
|
|
if len(config) > 0 {
|
|
C = config[0]
|
|
}
|
|
|
|
// Initialize the pack list for this anchor?
|
|
if _, ok := w.packs[C.Side]; !ok {
|
|
w.packs[C.Side] = []packedWidget{}
|
|
}
|
|
|
|
// Padding: if the user only provided Padding add it to both
|
|
// the X and Y value. If the user additionally provided the X
|
|
// and Y value, it will add to the base padding as you'd expect.
|
|
C.PadX += C.Padding
|
|
C.PadY += C.Padding
|
|
|
|
// Cache the full X and Y booleans.
|
|
C.fillX = C.Fill == FillX || C.Fill == FillBoth
|
|
C.fillY = C.Fill == FillY || C.Fill == FillBoth
|
|
|
|
// Adopt the child widget so it can access the Frame.
|
|
child.Adopt(w)
|
|
|
|
w.packs[C.Side] = append(w.packs[C.Side], packedWidget{
|
|
widget: child,
|
|
pack: C,
|
|
})
|
|
w.widgets = append(w.widgets, child)
|
|
}
|
|
|
|
// computePacked processes all the Pack layout widgets in the Frame.
|
|
func (w *Frame) computePacked(e render.Engine) {
|
|
var (
|
|
frameSize = w.BoxSize()
|
|
|
|
// maxWidth and maxHeight are always the computed minimum dimensions
|
|
// that the Frame must be to contain all of its children. If the Frame
|
|
// was configured with an explicit Size, the Frame will be that Size,
|
|
// but we still calculate how much space the widgets _actually_ take
|
|
// so we can expand them to fill remaining space in fixed size widgets.
|
|
maxWidth int32
|
|
maxHeight int32
|
|
visited = []packedWidget{}
|
|
expanded = []packedWidget{}
|
|
)
|
|
|
|
// Iterate through all packed sides and compute how much space to
|
|
// reserve to contain all of their widgets.
|
|
for side := SideMin; side <= SideMax; side++ {
|
|
if _, ok := w.packs[side]; !ok {
|
|
continue
|
|
}
|
|
|
|
var (
|
|
x int32
|
|
y int32
|
|
yDirection int32 = 1
|
|
xDirection int32 = 1
|
|
)
|
|
|
|
if side == Bottom { // TODO: these need tuning
|
|
y = frameSize.H - w.BoxThickness(4)
|
|
yDirection = -1 * w.BoxThickness(4) // parent + child BoxThickness(1) = 2
|
|
} else if side == Right {
|
|
x = frameSize.W - w.BoxThickness(4)
|
|
xDirection = -1 - w.BoxThickness(4) // - w.BoxThickness(2)
|
|
}
|
|
|
|
for _, packedWidget := range w.packs[side] {
|
|
|
|
child := packedWidget.widget
|
|
pack := packedWidget.pack
|
|
child.Compute(e)
|
|
|
|
if child.Hidden() {
|
|
continue
|
|
}
|
|
|
|
x += pack.PadX
|
|
y += pack.PadY
|
|
|
|
var (
|
|
// point = child.Point()
|
|
size = child.Size()
|
|
yStep = y * yDirection
|
|
xStep = x * xDirection
|
|
)
|
|
|
|
if xStep+size.W+(pack.PadX*2) > maxWidth {
|
|
maxWidth = xStep + size.W + (pack.PadX * 2)
|
|
}
|
|
if yStep+size.H+(pack.PadY*2) > maxHeight {
|
|
maxHeight = yStep + size.H + (pack.PadY * 2)
|
|
}
|
|
|
|
if side == Bottom {
|
|
y -= size.H - pack.PadY
|
|
} else if side == Right {
|
|
x -= size.W - pack.PadX
|
|
}
|
|
|
|
child.MoveTo(render.NewPoint(x, y))
|
|
|
|
if side == Top {
|
|
y += size.H + pack.PadY
|
|
} else if side == Left {
|
|
x += size.W + pack.PadX
|
|
}
|
|
|
|
visited = append(visited, packedWidget)
|
|
if pack.Expand { // TODO: don't fuck with children of fixed size
|
|
expanded = append(expanded, packedWidget)
|
|
}
|
|
}
|
|
}
|
|
|
|
// If we have extra space in the Frame and any expanding widgets, let the
|
|
// expanding widgets grow and share the remaining space.
|
|
computedSize := render.NewRect(maxWidth, maxHeight)
|
|
if w.fixedWidth > 0 {
|
|
computedSize.W = w.fixedWidth
|
|
}
|
|
if w.fixedHeight > 0 {
|
|
computedSize.H = w.fixedHeight
|
|
}
|
|
|
|
if len(expanded) > 0 && !frameSize.IsZero() && frameSize.Bigger(computedSize) {
|
|
// Divy up the size available.
|
|
growBy := render.Rect{
|
|
W: ((frameSize.W - computedSize.W) / int32(len(expanded))), // - w.BoxThickness(2),
|
|
H: ((frameSize.H - computedSize.H) / int32(len(expanded))), // - w.BoxThickness(2),
|
|
}
|
|
for _, pw := range expanded {
|
|
fmt.Printf("expand %s by %s (comp size %s)\n", pw.widget.ID(), growBy, computedSize)
|
|
pw.widget.ResizeAuto(growBy)
|
|
pw.widget.Compute(e)
|
|
}
|
|
}
|
|
|
|
// If we're not using a fixed Frame size, use the dynamically computed one.
|
|
if !w.FixedSize() {
|
|
frameSize = render.NewRect(maxWidth, maxHeight)
|
|
} else {
|
|
// If either of the sizes were left zero, use the dynamically computed one.
|
|
if frameSize.W == 0 {
|
|
frameSize.W = maxWidth
|
|
}
|
|
if frameSize.H == 0 {
|
|
frameSize.H = maxHeight
|
|
}
|
|
}
|
|
|
|
// Rescan all the widgets in this side to re-center them
|
|
// in their space.
|
|
innerFrameSize := render.NewRect(
|
|
frameSize.W-w.BoxThickness(2),
|
|
frameSize.H-w.BoxThickness(2),
|
|
)
|
|
for _, pw := range visited {
|
|
var (
|
|
child = pw.widget
|
|
pack = pw.pack
|
|
point = child.Point()
|
|
size = child.Size()
|
|
resize = size
|
|
resized bool
|
|
moved bool
|
|
)
|
|
|
|
if pack.Side == Top || pack.Side == Bottom {
|
|
if pack.fillX && resize.W < innerFrameSize.W {
|
|
resize.W = innerFrameSize.W - w.BoxThickness(2)
|
|
resized = true
|
|
}
|
|
if resize.W < innerFrameSize.W-w.BoxThickness(4) {
|
|
if pack.Anchor.IsCenter() {
|
|
point.X = (innerFrameSize.W / 2) - (resize.W / 2)
|
|
} else if pack.Anchor.IsWest() {
|
|
point.X = pack.PadX
|
|
} else if pack.Anchor.IsEast() {
|
|
point.X = innerFrameSize.W - resize.W - pack.PadX
|
|
}
|
|
|
|
moved = true
|
|
}
|
|
} else if pack.Side == Left || pack.Side == Right {
|
|
if pack.fillY && resize.H < innerFrameSize.H {
|
|
resize.H = innerFrameSize.H - w.BoxThickness(2) // BoxThickness(2) for parent + child
|
|
// point.Y -= (w.BoxThickness(4) + child.BoxThickness(2))
|
|
moved = true
|
|
resized = true
|
|
}
|
|
|
|
// Vertically align the widgets.
|
|
if resize.H < innerFrameSize.H {
|
|
if pack.Anchor.IsMiddle() {
|
|
point.Y = (innerFrameSize.H / 2) - (resize.H / 2) - w.BoxThickness(1)
|
|
} else if pack.Anchor.IsNorth() {
|
|
point.Y = pack.PadY - w.BoxThickness(4)
|
|
} else if pack.Anchor.IsSouth() {
|
|
point.Y = innerFrameSize.H - resize.H - pack.PadY
|
|
}
|
|
moved = true
|
|
}
|
|
} else {
|
|
panic("unsupported pack.Side")
|
|
}
|
|
|
|
if resized && size != resize {
|
|
fmt.Printf("fill: resize %s to %s\n", child.ID(), resize)
|
|
child.ResizeAuto(resize)
|
|
child.Compute(e)
|
|
}
|
|
if moved {
|
|
child.MoveTo(point)
|
|
}
|
|
}
|
|
|
|
// if !w.FixedSize() {
|
|
w.ResizeAuto(render.NewRect(
|
|
frameSize.W-w.BoxThickness(2),
|
|
frameSize.H-w.BoxThickness(2),
|
|
))
|
|
// }
|
|
}
|
|
|
|
// Anchor is a cardinal direction.
|
|
type Anchor uint8
|
|
|
|
// Side of a parent widget to pack children against.
|
|
type Side uint8
|
|
|
|
// Anchor and Side constants.
|
|
const (
|
|
Center Anchor = iota
|
|
N
|
|
NE
|
|
E
|
|
SE
|
|
S
|
|
SW
|
|
W
|
|
NW
|
|
|
|
Top Side = iota
|
|
Left
|
|
Right
|
|
Bottom
|
|
)
|
|
|
|
// Range of Anchor and Side values.
|
|
const (
|
|
AnchorMin = Center
|
|
AnchorMax = NW
|
|
|
|
SideMin = Top
|
|
SideMax = Bottom
|
|
)
|
|
|
|
// IsNorth returns if the anchor is N, NE or NW.
|
|
func (a Anchor) IsNorth() bool {
|
|
return a == N || a == NE || a == NW
|
|
}
|
|
|
|
// IsSouth returns if the anchor is S, SE or SW.
|
|
func (a Anchor) IsSouth() bool {
|
|
return a == S || a == SE || a == SW
|
|
}
|
|
|
|
// IsEast returns if the anchor is E, NE or SE.
|
|
func (a Anchor) IsEast() bool {
|
|
return a == E || a == NE || a == SE
|
|
}
|
|
|
|
// IsWest returns if the anchor is W, NW or SW.
|
|
func (a Anchor) IsWest() bool {
|
|
return a == W || a == NW || a == SW
|
|
}
|
|
|
|
// IsCenter returns if the anchor is Center, N or S, to determine
|
|
// whether to align text as centered for North/South anchors.
|
|
func (a Anchor) IsCenter() bool {
|
|
return a == Center || a == N || a == S
|
|
}
|
|
|
|
// IsMiddle returns if the anchor is Center, E or W, to determine
|
|
// whether to align text as middled for East/West anchors.
|
|
func (a Anchor) IsMiddle() bool {
|
|
return a == Center || a == W || a == E
|
|
}
|
|
|
|
type packLayout struct {
|
|
widgets []packedWidget
|
|
}
|
|
|
|
type packedWidget struct {
|
|
widget Widget
|
|
pack Pack
|
|
fill uint8
|
|
}
|
|
|
|
// packedWidget.fill values
|
|
const (
|
|
fillNone uint8 = iota
|
|
fillX
|
|
fillY
|
|
fillBoth
|
|
)
|