373 lines
9.2 KiB
Go
373 lines
9.2 KiB
Go
package x
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import "image"
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import "image/color"
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import "git.tebibyte.media/tomo/tomo"
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import "git.tebibyte.media/tomo/tomo/event"
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import "git.tebibyte.media/tomo/tomo/canvas"
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type containerBox struct {
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*box
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hOverflow, vOverflow bool
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hAlign, vAlign tomo.Align
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contentBounds image.Rectangle
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scroll image.Point
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capture [4]bool
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gap image.Point
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children []tomo.Box
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layout tomo.Layout
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on struct {
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contentBoundsChange event.FuncBroadcaster
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}
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}
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func (backend *Backend) NewContainerBox() tomo.ContainerBox {
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this := &containerBox { }
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this.box = backend.newBox(this)
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return this
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}
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func (this *containerBox) SetColor (c color.Color) {
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if this.color == c { return }
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this.box.SetColor(c)
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this.invalidateTransparentChildren()
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}
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func (this *containerBox) SetTextureTile (texture canvas.Texture) {
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if this.texture == texture { return }
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this.box.SetTextureTile(texture)
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this.invalidateTransparentChildren()
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}
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func (this *containerBox) SetTextureCenter (texture canvas.Texture) {
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if this.texture == texture { return }
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this.box.SetTextureTile(texture)
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this.invalidateTransparentChildren()
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}
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func (this *containerBox) SetOverflow (horizontal, vertical bool) {
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if this.hOverflow == horizontal && this.vOverflow == vertical { return }
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this.hOverflow = horizontal
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this.vOverflow = vertical
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this.invalidateLayout()
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}
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func (this *containerBox) SetAlign (x, y tomo.Align) {
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if this.hAlign == x && this.vAlign == y { return }
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this.hAlign = x
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this.vAlign = y
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this.invalidateLayout()
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}
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func (this *containerBox) ContentBounds () image.Rectangle {
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return this.contentBounds
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}
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func (this *containerBox) ScrollTo (point image.Point) {
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if this.scroll == point { return }
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this.scroll = point
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this.invalidateLayout()
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}
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func (this *containerBox) OnContentBoundsChange (callback func()) event.Cookie {
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return this.on.contentBoundsChange.Connect(callback)
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}
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func (this *containerBox) CaptureDND (capture bool) {
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this.capture[eventCategoryDND] = capture
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}
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func (this *containerBox) CaptureMouse (capture bool) {
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this.capture[eventCategoryMouse] = capture
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}
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func (this *containerBox) CaptureScroll (capture bool) {
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this.capture[eventCategoryScroll] = capture
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}
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func (this *containerBox) CaptureKeyboard (capture bool) {
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this.capture[eventCategoryKeyboard] = capture
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}
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func (this *containerBox) SetGap (gap image.Point) {
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if this.gap == gap { return }
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this.gap = gap
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this.invalidateLayout()
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this.invalidateMinimum()
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}
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func (this *containerBox) Add (child tomo.Object) {
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box := assertAnyBox(child.GetBox())
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if indexOf(this.children, tomo.Box(box)) > -1 { return }
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box.setParent(this)
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box.flushActionQueue()
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this.children = append(this.children, box)
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this.invalidateLayout()
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this.invalidateMinimum()
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}
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func (this *containerBox) Remove (child tomo.Object) {
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box := assertAnyBox(child.GetBox())
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index := indexOf(this.children, tomo.Box(box))
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if index < 0 { return }
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box.setParent(nil)
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this.children = remove(this.children, index)
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this.invalidateLayout()
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this.invalidateMinimum()
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}
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func (this *containerBox) Insert (child, before tomo.Object) {
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box := assertAnyBox(child.GetBox())
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if indexOf(this.children, tomo.Box(box)) > -1 { return }
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beforeBox := assertAnyBox(before.GetBox())
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index := indexOf(this.children, tomo.Box(beforeBox))
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if index < 0 {
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this.children = append(this.children, tomo.Box(box))
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} else {
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this.children = insert(this.children, index, tomo.Box(box))
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}
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box.setParent(this)
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this.invalidateLayout()
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this.invalidateMinimum()
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}
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func (this *containerBox) Clear () {
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for _, box := range this.children {
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box.(anyBox).setParent(nil)
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}
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this.children = nil
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this.invalidateLayout()
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this.invalidateMinimum()
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}
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func (this *containerBox) Length () int {
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return len(this.children)
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}
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func (this *containerBox) At (index int) tomo.Object {
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if index < 0 || index >= len(this.children) {
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return nil
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}
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return this.children[index]
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}
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func (this *containerBox) SetLayout (layout tomo.Layout) {
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this.layout = layout
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this.invalidateLayout()
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this.invalidateMinimum()
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}
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func (this *containerBox) Draw (can canvas.Canvas) {
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if can == nil { return }
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rocks := make([]image.Rectangle, len(this.children))
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for index, box := range this.children {
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rocks[index] = box.Bounds()
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}
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for _, tile := range canvas.Shatter(this.bounds, rocks...) {
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clipped := can.SubCanvas(tile)
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if this.transparent() && this.parent != nil {
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this.parent.drawBackgroundPart(clipped)
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}
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if clipped == nil { continue }
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pen := clipped.Pen()
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pen.Fill(this.color)
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pen.Texture(this.texture)
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pen.Rectangle(this.innerClippingBounds)
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}
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}
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func (this *containerBox) drawBackgroundPart (can canvas.Canvas) {
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if can == nil { return }
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pen := can.Pen()
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pen.Fill(this.color)
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pen.Texture(this.texture)
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if this.transparent() && this.parent != nil {
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this.parent.drawBackgroundPart(can)
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}
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pen.Rectangle(this.innerClippingBounds)
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}
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func (this *containerBox) invalidateTransparentChildren () {
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window := this.window()
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if window == nil { return }
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for _, box := range this.children {
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box := assertAnyBox(box)
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if box.transparent() {
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window.invalidateDraw(box)
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}
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}
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}
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func (this *containerBox) flushActionQueue () {
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for _, box := range this.children {
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box.(anyBox).flushActionQueue()
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}
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this.box.flushActionQueue()
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}
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func (this *containerBox) window () *window {
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if this.parent == nil { return nil }
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return this.parent.window()
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}
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func (this *containerBox) canvas () canvas.Canvas {
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return this.box.canvas
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}
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func (this *containerBox) notifyMinimumSizeChange (child anyBox) {
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this.invalidateMinimum()
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size := child.MinimumSize()
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bounds := child.Bounds()
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if bounds.Dx() < size.X || bounds.Dy() < size.Y {
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this.invalidateLayout()
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}
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}
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func (this *containerBox) layoutHints () tomo.LayoutHints {
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return tomo.LayoutHints {
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OverflowX: this.hOverflow,
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OverflowY: this.vOverflow,
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AlignX: this.hAlign,
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AlignY: this.vAlign,
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Gap: this.gap,
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}
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}
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func (this *containerBox) contentMinimum () image.Point {
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minimum := this.box.contentMinimum()
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if this.layout != nil {
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layoutMinimum := this.layout.MinimumSize (
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this.layoutHints(),
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this.children)
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if this.hOverflow { layoutMinimum.X = 0 }
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if this.vOverflow { layoutMinimum.Y = 0 }
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minimum = minimum.Add(layoutMinimum)
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}
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return minimum
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}
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func (this *containerBox) doLayout () {
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this.box.doLayout()
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previousContentBounds := this.contentBounds
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// by default, use innerBounds (translated to 0, 0) for contentBounds.
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// if a direction overflows, use the layout's minimum size for it.
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var minimum image.Point
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if this.layout != nil {
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minimum = this.layout.MinimumSize (
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this.layoutHints(),
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this.children)
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}
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innerBounds := this.InnerBounds()
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this.contentBounds = innerBounds.Sub(innerBounds.Min)
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if this.hOverflow { this.contentBounds.Max.X = this.contentBounds.Min.X + minimum.X }
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if this.vOverflow { this.contentBounds.Max.Y = this.contentBounds.Min.Y + minimum.Y }
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// arrange children
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if this.layout != nil {
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layoutHints := this.layoutHints()
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layoutHints.Bounds = this.contentBounds
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this.layout.Arrange(layoutHints, this.children)
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}
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// build an accurate contentBounds by unioning the bounds of all child
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// boxes
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this.contentBounds = image.Rectangle { }
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for _, box := range this.children {
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bounds := box.Bounds()
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this.contentBounds = this.contentBounds.Union(bounds)
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}
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// constrain the scroll
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this.constrainScroll()
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// offset children and contentBounds by scroll
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for _, box := range this.children {
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box.SetBounds(box.Bounds().Add(this.scroll).Add(innerBounds.Min))
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}
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this.contentBounds = this.contentBounds.Add(this.scroll)
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if previousContentBounds != this.contentBounds {
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this.on.contentBoundsChange.Broadcast()
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}
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}
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func (this *containerBox) constrainScroll () {
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innerBounds := this.InnerBounds()
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width := this.contentBounds.Dx()
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height := this.contentBounds.Dy()
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// X
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if width <= innerBounds.Dx() {
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this.scroll.X = 0
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} else if this.scroll.X > 0 {
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this.scroll.X = 0
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} else if this.scroll.X < innerBounds.Dx() - width {
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this.scroll.X = innerBounds.Dx() - width
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}
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// Y
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if height <= innerBounds.Dy() {
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this.scroll.Y = 0
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} else if this.scroll.Y > 0 {
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this.scroll.Y = 0
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} else if this.scroll.Y < innerBounds.Dy() - height {
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this.scroll.Y = innerBounds.Dy() - height
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}
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}
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func (this *containerBox) recursiveRedo () {
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this.doLayout()
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this.doDraw()
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for _, child := range this.children {
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child.(anyBox).recursiveRedo()
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}
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}
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func (this *containerBox) boxUnder (point image.Point, category eventCategory) anyBox {
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if !point.In(this.bounds) { return nil }
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if !this.capture[category] {
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for _, box := range this.children {
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candidate := box.(anyBox).boxUnder(point, category)
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if candidate != nil { return candidate }
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}
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}
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return this
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}
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func (this *containerBox) propagate (callback func (anyBox) bool) bool {
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for _, box := range this.children {
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box := box.(anyBox)
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if !box.propagate(callback) { return false }
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}
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return callback(this)
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}
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func (this *containerBox) propagateAlt (callback func (anyBox) bool) bool {
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if !callback(this) { return false}
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for _, box := range this.children {
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box := box.(anyBox)
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if !box.propagateAlt(callback) { return false }
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}
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return true
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}
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func (this *containerBox) captures (category eventCategory) bool {
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return this.capture[category]
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}
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