BeginMessageScroller#
func BeginMessageScroller(canvas *ui.Canvas, theme ui.Theme, bounds ui.Rect, contentExtent, offset float32) MessageScrollerBeginMessageScroller declares a vertically clipped message viewport.
Type MessageScroller
type MessageScroller struct {
// contains filtered or unexported fields
}MessageScroller is a vertical, source-owned scrolling recipe. The caller owns the offset, item list, content extent, and any auto-follow policy. Scoped wheel routing, pointer capture, inertia, observers, timers, and virtualization are runtime responsibilities and are not faked here.
Constructors
Methods
BeginContent#
func (scroller *MessageScroller) BeginContent() MessageScrollerGeometryBeginContent pushes the viewport clip for caller-painted message items.
Buttons#
func (scroller MessageScroller) Buttons(startID ui.ID, startLabel string, endID ui.ID, endLabel string) MessageScrollerButtons configures start/end jump actions. Visibility is derived from the clamped offset; inactive controls keep geometry but emit no paint or hit.
Disabled#
func (scroller MessageScroller) Disabled() MessageScrollerDisabled preserves deterministic geometry while suppressing all actions.
EndContent#
func (scroller *MessageScroller) EndContent() MessageScrollerGeometryEndContent closes the clip, then paints the thin thumb and active jump buttons.
Geometry#
func (scroller MessageScroller) Geometry() MessageScrollerGeometryGeometry returns the complete clamped layout without changing Canvas state.
ItemGeometry#
func (scroller MessageScroller) ItemGeometry(index int, contentOffset, extent float32) MessageScrollerItemGeometryItemGeometry translates one caller-supplied item offset and extent. The index is carried unchanged so stable application identity stays explicit.
Scrollbar#
func (scroller MessageScroller) Scrollbar(id ui.ID, label, value string) MessageScrollerScrollbar configures the optional thin scrollbar as a typed slider.