Joe Julian
89 lines
2.2 KiB
Go
89 lines
2.2 KiB
Go
package header
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import (
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"image"
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"gioui.org/layout"
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"gioui.org/op"
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"gioui.org/unit"
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)
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func AnchoredMenuX(triggerWidth, menuWidth int) int {
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return triggerWidth - menuWidth
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}
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func AnchoredMenuOriginX(containerWidth, rowOriginX, triggerRightX, menuWidth int) int {
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x := rowOriginX + triggerRightX - menuWidth
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if x < 0 {
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return 0
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}
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if x+menuWidth > containerWidth {
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return max(0, containerWidth-menuWidth)
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}
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return x
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}
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type DropdownAnchor struct {
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TriggerRightX int
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TriggerBottomY int
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}
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func (a DropdownAnchor) Point() image.Point {
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return image.Pt(a.TriggerRightX, a.TriggerBottomY)
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}
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type DropdownSurface struct {
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ContainerWidth int
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LeftInset int
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TopInset int
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}
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func (s DropdownSurface) MenuConstraints(gtx layout.Context) layout.Context {
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menuGTX := gtx
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menuGTX.Constraints.Min = image.Point{}
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menuGTX.Constraints.Max.X = max(0, s.ContainerWidth)
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return menuGTX
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}
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func (s DropdownSurface) Origin(anchor DropdownAnchor, menuWidth int) image.Point {
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x := s.LeftInset + AnchoredMenuOriginX(s.ContainerWidth, 0, anchor.TriggerRightX, menuWidth)
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y := s.TopInset + anchor.TriggerBottomY
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return image.Pt(x, y)
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}
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func (s DropdownSurface) Draw(gtx layout.Context, anchor DropdownAnchor, menu layout.Widget) layout.Dimensions {
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menuGTX := s.MenuConstraints(gtx)
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menuOps := op.Record(gtx.Ops)
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menuDims := layout.Inset{Top: unit.Dp(6)}.Layout(menuGTX, menu)
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menuCall := menuOps.Stop()
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menuOrigin := s.Origin(anchor, menuDims.Size.X)
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stack := op.Offset(menuOrigin).Push(gtx.Ops)
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menuCall.Add(gtx.Ops)
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stack.Pop()
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return layout.Dimensions{Size: gtx.Constraints.Max}
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}
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type ActionMetrics struct {
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RowOriginX int
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Spacing int
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RowDims layout.Dimensions
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SyncDims layout.Dimensions
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LockDims layout.Dimensions
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MainDims layout.Dimensions
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}
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func (m ActionMetrics) SyncAnchor() DropdownAnchor {
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return DropdownAnchor{
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TriggerRightX: m.RowOriginX + m.SyncDims.Size.X,
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TriggerBottomY: m.RowDims.Size.Y,
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}
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}
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func (m ActionMetrics) MainAnchor() DropdownAnchor {
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triggerRightX := m.SyncDims.Size.X + m.Spacing + m.LockDims.Size.X + m.Spacing + m.MainDims.Size.X
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return DropdownAnchor{
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TriggerRightX: m.RowOriginX + triggerRightX,
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TriggerBottomY: m.RowDims.Size.Y,
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}
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}
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