package x import "image" import "git.tebibyte.media/sashakoshka/tomo" import "git.tebibyte.media/sashakoshka/tomo/canvas" type entity struct { window *window parent *entity children []*entity element tomo.Element bounds image.Rectangle clippedBounds image.Rectangle minWidth int minHeight int selected bool layoutInvalid bool isContainer bool } func (backend *Backend) NewEntity (owner tomo.Element) tomo.Entity { entity := &entity { element: owner } if _, ok := owner.(tomo.Container); ok { entity.isContainer = true entity.InvalidateLayout() } return entity } func (ent *entity) unlink () { ent.propagate (func (child *entity) bool { if child.window != nil { delete(ent.window.system.drawingInvalid, child) } child.window = nil return true }) if ent.window != nil { delete(ent.window.system.drawingInvalid, ent) } ent.parent = nil ent.window = nil if element, ok := ent.element.(tomo.Selectable); ok { ent.selected = false element.HandleSelectionChange() } } func (entity *entity) link (parent *entity) { entity.parent = parent entity.clip(parent.clippedBounds) if parent.window != nil { entity.setWindow(parent.window) } } func (ent *entity) setWindow (window *window) { ent.window = window ent.Invalidate() ent.InvalidateLayout() ent.propagate (func (child *entity) bool { child.window = window ent.Invalidate() ent.InvalidateLayout() return true }) } func (entity *entity) propagate (callback func (*entity) bool) bool { for _, child := range entity.children { if !child.propagate(callback) { return false } } return callback(entity) } func (entity *entity) childAt (point image.Point) *entity { for _, child := range entity.children { if point.In(child.bounds) { return child.childAt(point) } } return entity } func (entity *entity) scrollTargetChildAt (point image.Point) *entity { for _, child := range entity.children { if point.In(child.bounds) { result := child.scrollTargetChildAt(point) if result != nil { return result } break } } if _, ok := entity.element.(tomo.ScrollTarget); ok { return entity } return nil } func (entity *entity) forMouseTargetContainers (callback func (tomo.MouseTargetContainer, tomo.Element)) { if entity.parent == nil { return } if parent, ok := entity.parent.element.(tomo.MouseTargetContainer); ok { callback(parent, entity.element) } entity.parent.forMouseTargetContainers(callback) } func (entity *entity) clip (bounds image.Rectangle) { entity.clippedBounds = entity.bounds.Intersect(bounds) for _, child := range entity.children { child.clip(entity.clippedBounds) } } // ----------- Entity ----------- // func (entity *entity) Invalidate () { if entity.window == nil { return } if entity.window.system.invalidateIgnore { return } entity.window.drawingInvalid.Add(entity) } func (entity *entity) Bounds () image.Rectangle { return entity.bounds } func (entity *entity) Window () tomo.Window { return entity.window } func (entity *entity) SetMinimumSize (width, height int) { entity.minWidth = width entity.minHeight = height if entity.parent == nil { if entity.window != nil { entity.window.setMinimumSize(width, height) } } else { entity.parent.element.(tomo.Container). HandleChildMinimumSizeChange(entity.element) } } func (entity *entity) DrawBackground (destination canvas.Canvas) { if entity.parent != nil { entity.parent.element.(tomo.Container).DrawBackground(destination) } else if entity.window != nil { entity.window.system.theme.Pattern ( tomo.PatternBackground, tomo.State { }).Draw ( destination, entity.window.canvas.Bounds()) } } // ----------- ContainerEntity ----------- // func (entity *entity) InvalidateLayout () { if entity.window == nil { return } if !entity.isContainer { return } entity.layoutInvalid = true entity.window.system.anyLayoutInvalid = true } func (ent *entity) Adopt (child tomo.Element) { childEntity, ok := child.Entity().(*entity) if !ok || childEntity == nil { return } childEntity.link(ent) ent.children = append(ent.children, childEntity) } func (ent *entity) Insert (index int, child tomo.Element) { childEntity, ok := child.Entity().(*entity) if !ok || childEntity == nil { return } ent.children = append ( ent.children[:index + 1], ent.children[index:]...) ent.children[index] = childEntity } func (entity *entity) Disown (index int) { entity.children[index].unlink() entity.children = append ( entity.children[:index], entity.children[index + 1:]...) } func (entity *entity) IndexOf (child tomo.Element) int { for index, childEntity := range entity.children { if childEntity.element == child { return index } } return -1 } func (entity *entity) Child (index int) tomo.Element { return entity.children[index].element } func (entity *entity) CountChildren () int { return len(entity.children) } func (entity *entity) PlaceChild (index int, bounds image.Rectangle) { child := entity.children[index] child.bounds = bounds child.clip(entity.clippedBounds) child.Invalidate() child.InvalidateLayout() } func (entity *entity) SelectChild (index int, selected bool) { child := entity.children[index] if element, ok := child.element.(tomo.Selectable); ok { if child.selected == selected { return } child.selected = selected element.HandleSelectionChange() } } func (entity *entity) ChildMinimumSize (index int) (width, height int) { childEntity := entity.children[index] return childEntity.minWidth, childEntity.minHeight } // ----------- FocusableEntity ----------- // func (entity *entity) Focused () bool { if entity.window == nil { return false } return entity.window.focused == entity } func (entity *entity) Focus () { if entity.window == nil { return } entity.window.system.focus(entity) } func (entity *entity) FocusNext () { entity.window.system.focusNext() } func (entity *entity) FocusPrevious () { entity.window.system.focusPrevious() } // ----------- SelectableEntity ----------- // func (entity *entity) Selected () bool { return entity.selected } // ----------- FlexibleEntity ----------- // func (entity *entity) NotifyFlexibleHeightChange () { if entity.parent == nil { return } if parent, ok := entity.parent.element.(tomo.FlexibleContainer); ok { parent.HandleChildFlexibleHeightChange ( entity.element.(tomo.Flexible)) } } // ----------- ScrollableEntity ----------- // func (entity *entity) NotifyScrollBoundsChange () { if entity.parent == nil { return } if parent, ok := entity.parent.element.(tomo.ScrollableContainer); ok { parent.HandleChildScrollBoundsChange ( entity.element.(tomo.Scrollable)) } }