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workspace_responsive.go

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package tideui

// ResponsivePolicy interprets panels' generalized fallback rules and role

// defaults to produce a layout that fits a given width. It is stateless apart

// from the caller-owned threshold memory, which supplies hysteresis so a

// workspace does not flicker between layouts around a breakpoint.

type ResponsivePolicy struct {

// Enabled turns semantic reflow on. When false the tree is returned as-is.

Enabled bool

// Hysteresis is the extra width required to leave a collapsed state once

// entered, in columns. Zero uses 2.

Hysteresis int

}

type responsiveAction struct {

id string

mode FallbackMode

with string

target string

below int

explicit bool

}

// Apply returns a reflowed copy of root for width, along with the panels it

// hid and the panels it reduced to a collapsed header. The state map records

// the threshold currently active per panel and is updated in place.

func (p ResponsivePolicy) Apply(root LayoutNode, width int, panels map[string]*Panel, order []string, state map[string]int) (LayoutNode, map[string]bool, map[string]bool) {

hidden := map[string]bool{}

collapsed := map[string]bool{}

if root == nil || width <= 0 || len(panels) == 0 {

return root, hidden, collapsed

}

hysteresis := p.Hysteresis

if hysteresis <= 0 {

hysteresis = 2

}

primary := primaryPanelID(panels, order)

var actions []responsiveAction

for _, id := range order {

panel := panels[id]

if panel == nil {

continue

}

action, ok := selectFallback(panel, width, primary, state, hysteresis)

if !ok {

delete(state, id)

continue

}

state[id] = action.below

actions = append(actions, action)

}

tree := CloneLayout(root)

// Hides first, so later moves never target a removed panel.

for _, action := range actions {

if action.mode == FallbackHide {

if panel := panels[action.id]; panel != nil && !panel.CanHide() {

continue

}

if next, removed := RemovePanel(tree, action.id); removed {

tree = next

hidden[action.id] = true

}

}

}

for _, action := range actions {

if hidden[action.id] || !LayoutContainsPanel(tree, action.id) {

continue

}

switch action.mode {

case FallbackStack:

if action.with == "" || action.with == action.id {

continue

}

if !LayoutContainsPanel(tree, action.with) {

continue

}

tree = MovePanel(tree, action.id, action.with, DockCenter)

case FallbackMoveBelow:

if action.target == "" || action.target == action.id {

continue

}

if !LayoutContainsPanel(tree, action.target) {

continue

}

tree = MovePanel(tree, action.id, action.target, DockBelow)

case FallbackMoveRight:

if action.target == "" || action.target == action.id {

continue

}

if !LayoutContainsPanel(tree, action.target) {

continue

}

tree = MovePanel(tree, action.id, action.target, DockRight)

case FallbackCollapse:

if panel := panels[action.id]; panel != nil && !panel.CanHide() {

continue

}

collapsed[action.id] = true

}

}

return NormalizeLayout(tree), hidden, collapsed

}

// selectFallback chooses the most severe applicable rule for a panel. Explicit

// rules win over role defaults; among applicable rules the narrowest threshold

// (the most severe) wins. Hysteresis keeps the previously chosen threshold

// active until the workspace widens past it.

func selectFallback(panel *Panel, width int, primary string, state map[string]int, hysteresis int) (responsiveAction, bool) {

active := state[panel.id]

match := func(below int) bool {

if width < below {

return true

}

return active == below && width < below+hysteresis

}

best := responsiveAction{}

found := false

for _, fb := range panel.fallbacks {

if fb.Below <= 0 || !match(fb.Below) {

continue

}

if !found || fb.Below < best.below {

best = responsiveAction{id: panel.id, mode: fb.Mode, with: fb.With, target: fb.Target, below: fb.Below, explicit: true}

found = true

}

}

if found {

return best, true

}

if def, ok := defaultFallback(panel, primary); ok && match(def.below) {

return def, true

}

return responsiveAction{}, false

}

// defaultFallback derives a gentle rule from a panel's role for applications

// that do not declare their own ladders.

func defaultFallback(panel *Panel, primary string) (responsiveAction, bool) {

action := responsiveAction{id: panel.id, explicit: false}

switch panel.role {

case RoleOptional:

action.mode, action.below = FallbackHide, 80

case RoleTelemetry:

action.mode, action.below = FallbackHide, 70

case RoleNavigation:

action.mode, action.below = FallbackCollapse, 60

case RoleSecondary:

action.mode, action.below = FallbackCollapse, 45

case RoleInspector:

if primary == "" || primary == panel.id {

return responsiveAction{}, false

}

action.mode, action.target, action.below = FallbackMoveBelow, primary, 100

default:

return responsiveAction{}, false

}

return action, true

}

func primaryPanelID(panels map[string]*Panel, order []string) string {

for _, id := range order {

if panel := panels[id]; panel != nil && panel.role == RolePrimary {

return id

}

}

return ""

}

// ResponsiveWidth returns the width at which a panel's most severe explicit

// rule triggers, or 0 when it has none. Used by tests and diagnostics.

func ResponsiveWidth(panel *Panel) int {

best := 0

for _, fb := range panel.fallbacks {

if best == 0 || fb.Below < best {

best = fb.Below

}

}

return best

}