selection

type AnchorInfo struct {
	// Direction is the text direction of the character at selection edge.
	Direction style.ResolvedTextDirection
	// Offset is the character offset for the selection edge.
	// This offset is within the individual child text composable.
	Offset int
	// SelectableId is the id of the Selectable which contains this anchor.
	SelectableId int64
}

type Composable = compose.Composable

type Handle int

type HapticFeedback interface {
	PerformHapticFeedback(feedbackType HapticFeedbackType)
}

type HapticFeedbackType int

type SectionContainerOption func(*SectionContainerOptions)

type SectionContainerOptions struct {
	Modifier ui.Modifier
}

type Selectable interface {
	// SelectableId returns an ID used by SelectionRegistrar to identify this Selectable.
	// This value should not be InvalidSelectableId.
	SelectableId() int64

	// AppendSelectableInfoToBuilder adds SelectableInfo representing this Selectable
	// to the SelectionLayoutBuilder.
	AppendSelectableInfoToBuilder(builder SelectionLayoutBuilder)

	// GetSelectAllSelection returns selectAll Selection information for this selectable.
	// Returns nil if no selection can be provided.
	GetSelectAllSelection() *Selection

	// GetHandlePosition returns the Offset of a SelectionHandle.
	// isStartHandle is true for the start handle, false for the end handle.
	GetHandlePosition(selection Selection, isStartHandle bool) geometry.Offset

	// GetLayoutCoordinates returns the LayoutCoordinates of the Selectable.
	// This could be nil if called before composing.
	GetLayoutCoordinates() layout.LayoutCoordinates

	// TextLayoutResult returns the TextLayoutResult of the selectable.
	// This could be nil if called before composing.
	TextLayoutResult() *text.TextLayoutResult

	// GetText returns the text content as AnnotatedString of the Selectable.
	GetText() text.AnnotatedString

	// GetBoundingBox returns the bounding box of the character for given offset.
	// Returns Rect.Zero if the selectable is empty.
	GetBoundingBox(offset int) geometry.Rect

	// GetLineLeft returns the left x coordinate of the line for the given offset.
	GetLineLeft(offset int) float32

	// GetLineRight returns the right x coordinate of the line for the given offset.
	GetLineRight(offset int) float32

	// GetCenterYForOffset returns the center y coordinate of the line
	// on which the specified text offset appears.
	GetCenterYForOffset(offset int) float32

	// GetRangeOfLineContaining returns the offsets of the start and end of the line
	// containing the given offset, or TextRange.Zero if the selectable is empty.
	GetRangeOfLineContaining(offset int) text.TextRange

	// GetLastVisibleOffset returns the last visible character's offset.
	// Some lines can be hidden due to maxLines or Constraints.maxHeight.
	GetLastVisibleOffset() int

	// GetLineHeight returns the text line height for the given offset.
	GetLineHeight(offset int) float32
}

type Selection struct {
	// Start contains information about the start of the selection.
	Start AnchorInfo
	// End contains information about the end of the selection.
	End AnchorInfo
	// HandlesCrossed is true when the user drags one handle to cross the other handle.
	// When selection happens in a single widget, checking TextRange.start > TextRange.end
	// is enough. But when selection happens across multiple widgets, this value needs
	// more complicated calculation.
	HandlesCrossed bool
}

type SelectionAdjustment int

type SelectionLayout interface {
	// ShouldRecomputeSelection returns true if selection should be recomputed
	// based on the previous layout.
	ShouldRecomputeSelection(previousLayout SelectionLayout) bool
}

type SelectionLayoutBuilder interface {
}

type SelectionManager struct {

	// hapticFeedback provides haptic feedback.
	HapticFeedback HapticFeedback

	// onCopyHandler handles copy operations.
	OnCopyHandler func(text.AnnotatedString)

	// textToolbar shows floating toolbar.
	TextToolbar TextToolbar
	// contains filtered or unexported fields
}

type SelectionRegistrar interface {
	// Subselections returns the map storing current selection information on each Selectable.
	// A selectable can query its selected range using its selectableId.
	Subselections() map[int64]*Selection

	// Subscribe registers a Selectable to this SelectionRegistrar.
	// Returns the Selectable for use with Unsubscribe.
	Subscribe(selectable Selectable) Selectable

	// Unsubscribe removes a Selectable from this SelectionRegistrar.
	Unsubscribe(selectable Selectable)

	// NextSelectableId returns a unique ID for a Selectable.
	NextSelectableId() int64

	// NotifyPositionChange is called when the global position of a subscribed Selectable changes.
	NotifyPositionChange(selectableId int64)

	// NotifySelectionUpdateStart is called when selection has been initiated.
	// layoutCoordinates: LayoutCoordinates of the Selectable.
	// startPosition: coordinates where selection is initiated.
	// adjustment: how selection should be adjusted.
	// isInTouchMode: whether the update is from a touch pointer.
	NotifySelectionUpdateStart(
		layoutCoordinates layout.LayoutCoordinates,
		startPosition geometry.Offset,
		adjustment SelectionAdjustment,
		isInTouchMode bool,
	)

	// NotifySelectionUpdateSelectAll is called when selection is initiated with selectAll.
	// selectableId: the selectableId of the Selectable.
	// isInTouchMode: whether the update is from a touch pointer.
	NotifySelectionUpdateSelectAll(selectableId int64, isInTouchMode bool)

	// NotifySelectionUpdate is called when a selection handle has moved.
	// Returns true if the selection handle movement is consumed.
	NotifySelectionUpdate(
		layoutCoordinates layout.LayoutCoordinates,
		newPosition geometry.Offset,
		previousPosition geometry.Offset,
		isStartHandle bool,
		adjustment SelectionAdjustment,
		isInTouchMode bool,
	) bool

	// NotifySelectionUpdateEnd is called when selection update has stopped.
	NotifySelectionUpdateEnd()

	// NotifySelectableChange is called when the content of a selectable has changed.
	NotifySelectableChange(selectableId int64)
}

type SelectionRegistrarImpl struct {

	// OnPositionChangeCallback is called when a position change was triggered.
	OnPositionChangeCallback func(selectableId int64)

	// OnSelectionUpdateStartCallback is called when selection is initiated.
	OnSelectionUpdateStartCallback func(isInTouchMode bool, layoutCoordinates layout.LayoutCoordinates, position geometry.Offset, adjustment SelectionAdjustment)

	// OnSelectionUpdateSelectAllCallback is called when selection is initiated with selectAll.
	OnSelectionUpdateSelectAllCallback func(isInTouchMode bool, selectableId int64)

	// OnSelectionUpdateCallback is called when selection is updated.
	OnSelectionUpdateCallback func(isInTouchMode bool, layoutCoordinates layout.LayoutCoordinates, newPosition, previousPosition geometry.Offset, isStartHandle bool, adjustment SelectionAdjustment) bool

	// OnSelectionUpdateEndCallback is called when selection update finished.
	OnSelectionUpdateEndCallback func()

	// OnSelectableChangeCallback is called when one of the selectable has changed.
	OnSelectableChangeCallback func(selectableId int64)

	// AfterSelectableUnsubscribe is called after a selectable is unsubscribed.
	AfterSelectableUnsubscribe func(selectableId int64)
	// contains filtered or unexported fields
}

type TextSelectionColors struct {
	// HandleColor is the color used for the selection handles.
	HandleColor graphics.Color
	// BackgroundColor is the color used for the selection background highlight.
	BackgroundColor graphics.Color
}

type TextToolbar interface {
	ShowMenu(rect geometry.Rect, onCopy func(), onSelectAll func())
	Hide()
	Status() TextToolbarStatus
}

type TextToolbarStatus int