Noah Petherbridge
a316bafb12
Move all Doodle source code into the src/ subpackage and move the publicly shareable stuff into lib/, for example lib/ui and lib/render. This cleans up the git root and helps make the Doodle UI library more easily publishable as a separate open source project. Currently both lib/ui and lib/render import one or two things from doodle/src that need to be broken apart.
319 lines
7.5 KiB
Go
319 lines
7.5 KiB
Go
package ui
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import (
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"git.kirsle.net/apps/doodle/lib/render"
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)
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// Pack provides configuration fields for Frame.Pack().
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type Pack struct {
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// Side of the parent to anchor the position to, like N, SE, W. Default
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// is Center.
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Anchor Anchor
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// If the widget is smaller than its allocated space, grow the widget
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// to fill its space in the Frame.
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Fill bool
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FillX bool
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FillY bool
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Padding int32 // Equal padding on X and Y.
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PadX int32
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PadY int32
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Expand bool // Widget should grow its allocated space to better fill the parent.
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}
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// Pack a widget along a side of the frame.
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func (w *Frame) Pack(child Widget, config ...Pack) {
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var C Pack
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if len(config) > 0 {
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C = config[0]
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}
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// Initialize the pack list for this anchor?
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if _, ok := w.packs[C.Anchor]; !ok {
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w.packs[C.Anchor] = []packedWidget{}
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}
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// Padding: if the user only provided Padding add it to both
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// the X and Y value. If the user additionally provided the X
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// and Y value, it will add to the base padding as you'd expect.
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C.PadX += C.Padding
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C.PadY += C.Padding
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// Fill: true implies both directions.
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if C.Fill {
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C.FillX = true
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C.FillY = true
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}
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// Adopt the child widget so it can access the Frame.
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child.Adopt(w)
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w.packs[C.Anchor] = append(w.packs[C.Anchor], packedWidget{
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widget: child,
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pack: C,
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})
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w.widgets = append(w.widgets, child)
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}
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// computePacked processes all the Pack layout widgets in the Frame.
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func (w *Frame) computePacked(e render.Engine) {
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var (
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frameSize = w.BoxSize()
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// maxWidth and maxHeight are always the computed minimum dimensions
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// that the Frame must be to contain all of its children. If the Frame
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// was configured with an explicit Size, the Frame will be that Size,
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// but we still calculate how much space the widgets _actually_ take
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// so we can expand them to fill remaining space in fixed size widgets.
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maxWidth int32
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maxHeight int32
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visited = []packedWidget{}
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expanded = []packedWidget{}
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)
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// Iterate through all anchored directions and compute how much space to
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// reserve to contain all of their widgets.
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for anchor := AnchorMin; anchor <= AnchorMax; anchor++ {
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if _, ok := w.packs[anchor]; !ok {
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continue
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}
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var (
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x int32
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y int32
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yDirection int32 = 1
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xDirection int32 = 1
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)
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if anchor.IsSouth() { // TODO: these need tuning
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y = frameSize.H - w.BoxThickness(4)
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yDirection = -1 * w.BoxThickness(4) // parent + child BoxThickness(1) = 2
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} else if anchor == E {
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x = frameSize.W - w.BoxThickness(4)
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xDirection = -1 - w.BoxThickness(4) // - w.BoxThickness(2)
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}
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for _, packedWidget := range w.packs[anchor] {
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child := packedWidget.widget
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pack := packedWidget.pack
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child.Compute(e)
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if child.Hidden() {
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continue
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}
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x += pack.PadX
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y += pack.PadY
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var (
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// point = child.Point()
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size = child.Size()
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yStep = y * yDirection
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xStep = x * xDirection
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)
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if xStep+size.W+(pack.PadX*2) > maxWidth {
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maxWidth = xStep + size.W + (pack.PadX * 2)
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}
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if yStep+size.H+(pack.PadY*2) > maxHeight {
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maxHeight = yStep + size.H + (pack.PadY * 2)
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}
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if anchor.IsSouth() {
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y -= size.H - pack.PadY
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}
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if anchor.IsEast() {
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x -= size.W - pack.PadX
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}
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child.MoveTo(render.NewPoint(x, y))
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if anchor.IsNorth() {
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y += size.H + pack.PadY
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}
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if anchor == W {
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x += size.W + pack.PadX
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}
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visited = append(visited, packedWidget)
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if pack.Expand { // TODO: don't fuck with children of fixed size
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expanded = append(expanded, packedWidget)
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}
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}
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}
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// If we have extra space in the Frame and any expanding widgets, let the
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// expanding widgets grow and share the remaining space.
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computedSize := render.NewRect(maxWidth, maxHeight)
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if len(expanded) > 0 && !frameSize.IsZero() && frameSize.Bigger(computedSize) {
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// Divy up the size available.
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growBy := render.Rect{
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W: ((frameSize.W - computedSize.W) / int32(len(expanded))), // - w.BoxThickness(2),
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H: ((frameSize.H - computedSize.H) / int32(len(expanded))), // - w.BoxThickness(2),
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}
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for _, pw := range expanded {
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pw.widget.ResizeBy(growBy)
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pw.widget.Compute(e)
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}
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}
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// If we're not using a fixed Frame size, use the dynamically computed one.
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if !w.FixedSize() {
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frameSize = render.NewRect(maxWidth, maxHeight)
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} else {
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// If either of the sizes were left zero, use the dynamically computed one.
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if frameSize.W == 0 {
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frameSize.W = maxWidth
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}
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if frameSize.H == 0 {
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frameSize.H = maxHeight
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}
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}
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// Rescan all the widgets in this anchor to re-center them
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// in their space.
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innerFrameSize := render.NewRect(
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frameSize.W-w.BoxThickness(2),
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frameSize.H-w.BoxThickness(2),
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)
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for _, pw := range visited {
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var (
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child = pw.widget
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pack = pw.pack
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point = child.Point()
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size = child.Size()
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resize = size
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resized bool
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moved bool
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)
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if pack.Anchor.IsNorth() || pack.Anchor.IsSouth() {
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if pack.FillX && resize.W < innerFrameSize.W {
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resize.W = innerFrameSize.W - w.BoxThickness(2)
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resized = true
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}
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if resize.W < innerFrameSize.W-w.BoxThickness(4) {
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if pack.Anchor.IsCenter() {
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point.X = (innerFrameSize.W / 2) - (resize.W / 2)
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} else if pack.Anchor.IsWest() {
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point.X = pack.PadX
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} else if pack.Anchor.IsEast() {
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point.X = innerFrameSize.W - resize.W - pack.PadX
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}
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moved = true
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}
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} else if pack.Anchor.IsWest() || pack.Anchor.IsEast() {
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if pack.FillY && resize.H < innerFrameSize.H {
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resize.H = innerFrameSize.H - w.BoxThickness(2) // BoxThickness(2) for parent + child
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// point.Y -= (w.BoxThickness(4) + child.BoxThickness(2))
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moved = true
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resized = true
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}
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// Vertically align the widgets.
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if resize.H < innerFrameSize.H {
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if pack.Anchor.IsMiddle() {
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point.Y = (innerFrameSize.H / 2) - (resize.H / 2) - w.BoxThickness(1)
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} else if pack.Anchor.IsNorth() {
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point.Y = pack.PadY - w.BoxThickness(4)
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} else if pack.Anchor.IsSouth() {
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point.Y = innerFrameSize.H - resize.H - pack.PadY
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}
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moved = true
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}
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} else {
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log.Error("unsupported pack.Anchor")
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}
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if resized && size != resize {
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child.Resize(resize)
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child.Compute(e)
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}
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if moved {
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child.MoveTo(point)
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}
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}
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// if !w.FixedSize() {
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w.Resize(render.NewRect(
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frameSize.W-w.BoxThickness(2),
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frameSize.H-w.BoxThickness(2),
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))
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// }
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}
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// Anchor is a cardinal direction.
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type Anchor uint8
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// Anchor values.
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const (
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Center Anchor = iota
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N
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NE
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E
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SE
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S
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SW
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W
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NW
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)
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// Range of Anchor values.
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const (
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AnchorMin = Center
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AnchorMax = NW
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)
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// IsNorth returns if the anchor is N, NE or NW.
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func (a Anchor) IsNorth() bool {
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return a == N || a == NE || a == NW
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}
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// IsSouth returns if the anchor is S, SE or SW.
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func (a Anchor) IsSouth() bool {
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return a == S || a == SE || a == SW
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}
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// IsEast returns if the anchor is E, NE or SE.
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func (a Anchor) IsEast() bool {
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return a == E || a == NE || a == SE
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}
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// IsWest returns if the anchor is W, NW or SW.
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func (a Anchor) IsWest() bool {
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return a == W || a == NW || a == SW
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}
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// IsCenter returns if the anchor is Center, N or S, to determine
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// whether to align text as centered for North/South anchors.
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func (a Anchor) IsCenter() bool {
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return a == Center || a == N || a == S
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}
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// IsMiddle returns if the anchor is Center, E or W, to determine
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// whether to align text as middled for East/West anchors.
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func (a Anchor) IsMiddle() bool {
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return a == Center || a == W || a == E
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}
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type packLayout struct {
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widgets []packedWidget
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}
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type packedWidget struct {
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widget Widget
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pack Pack
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fill uint8
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}
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// packedWidget.fill values
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const (
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fillNone uint8 = iota
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fillX
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fillY
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fillBoth
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)
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