484 lines
13 KiB
Go
484 lines
13 KiB
Go
package basicElements
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import "image"
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import "git.tebibyte.media/sashakoshka/tomo/input"
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import "git.tebibyte.media/sashakoshka/tomo/theme"
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import "git.tebibyte.media/sashakoshka/tomo/canvas"
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import "git.tebibyte.media/sashakoshka/tomo/artist"
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import "git.tebibyte.media/sashakoshka/tomo/layouts"
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import "git.tebibyte.media/sashakoshka/tomo/elements"
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import "git.tebibyte.media/sashakoshka/tomo/elements/core"
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var containerCase = theme.C("basic", "container")
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// Container is an element capable of containg other elements, and arranging
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// them in a layout.
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type Container struct {
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*core.Core
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core core.CoreControl
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layout layouts.Layout
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children []layouts.LayoutEntry
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drags [10]elements.MouseTarget
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warping bool
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focused bool
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focusable bool
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flexible bool
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onFocusRequest func () (granted bool)
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onFocusMotionRequest func (input.KeynavDirection) (granted bool)
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onFlexibleHeightChange func ()
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}
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// NewContainer creates a new container.
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func NewContainer (layout layouts.Layout) (element *Container) {
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element = &Container { }
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element.Core, element.core = core.NewCore(element.redoAll)
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element.SetLayout(layout)
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return
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}
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// SetLayout sets the layout of this container.
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func (element *Container) SetLayout (layout layouts.Layout) {
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element.layout = layout
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if element.core.HasImage() {
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element.redoAll()
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element.core.DamageAll()
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}
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}
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// Adopt adds a new child element to the container. If expand is set to true,
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// the element will expand (instead of contract to its minimum size), in
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// whatever way is defined by the current layout.
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func (element *Container) Adopt (child elements.Element, expand bool) {
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// set event handlers
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child.OnDamage (func (region canvas.Canvas) {
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element.core.DamageRegion(region.Bounds())
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})
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child.OnMinimumSizeChange(element.updateMinimumSize)
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if child0, ok := child.(elements.Flexible); ok {
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child0.OnFlexibleHeightChange(element.updateMinimumSize)
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}
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if child0, ok := child.(elements.Focusable); ok {
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child0.OnFocusRequest (func () (granted bool) {
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return element.childFocusRequestCallback(child0)
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})
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child0.OnFocusMotionRequest (
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func (direction input.KeynavDirection) (granted bool) {
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if element.onFocusMotionRequest == nil { return }
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return element.onFocusMotionRequest(direction)
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})
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}
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// add child
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element.children = append (element.children, layouts.LayoutEntry {
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Element: child,
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Expand: expand,
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})
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// refresh stale data
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element.updateMinimumSize()
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element.reflectChildProperties()
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if element.core.HasImage() && !element.warping {
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element.redoAll()
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element.core.DamageAll()
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}
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}
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// Warp runs the specified callback, deferring all layout and rendering updates
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// until the callback has finished executing. This allows for aplications to
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// perform batch gui updates without flickering and stuff.
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func (element *Container) Warp (callback func ()) {
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if element.warping {
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callback()
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return
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}
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element.warping = true
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callback()
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element.warping = false
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// TODO: create some sort of task list so we don't do a full recalculate
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// and redraw every time, because although that is the most likely use
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// case, it is not the only one.
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if element.core.HasImage() {
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element.redoAll()
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element.core.DamageAll()
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}
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}
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// Disown removes the given child from the container if it is contained within
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// it.
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func (element *Container) Disown (child elements.Element) {
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for index, entry := range element.children {
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if entry.Element == child {
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element.clearChildEventHandlers(entry.Element)
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element.children = append (
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element.children[:index],
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element.children[index + 1:]...)
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break
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}
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}
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element.updateMinimumSize()
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element.reflectChildProperties()
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if element.core.HasImage() && !element.warping {
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element.redoAll()
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element.core.DamageAll()
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}
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}
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func (element *Container) clearChildEventHandlers (child elements.Element) {
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child.DrawTo(nil)
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child.OnDamage(nil)
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child.OnMinimumSizeChange(nil)
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if child0, ok := child.(elements.Focusable); ok {
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child0.OnFocusRequest(nil)
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child0.OnFocusMotionRequest(nil)
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if child0.Focused() {
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child0.HandleUnfocus()
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}
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}
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if child0, ok := child.(elements.Flexible); ok {
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child0.OnFlexibleHeightChange(nil)
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}
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}
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// DisownAll removes all child elements from the container at once.
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func (element *Container) DisownAll () {
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element.children = nil
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element.updateMinimumSize()
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element.reflectChildProperties()
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if element.core.HasImage() && !element.warping {
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element.redoAll()
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element.core.DamageAll()
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}
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}
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// Children returns a slice containing this element's children.
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func (element *Container) Children () (children []elements.Element) {
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children = make([]elements.Element, len(element.children))
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for index, entry := range element.children {
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children[index] = entry.Element
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}
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return
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}
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// CountChildren returns the amount of children contained within this element.
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func (element *Container) CountChildren () (count int) {
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return len(element.children)
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}
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// Child returns the child at the specified index. If the index is out of
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// bounds, this method will return nil.
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func (element *Container) Child (index int) (child elements.Element) {
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if index < 0 || index > len(element.children) { return }
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return element.children[index].Element
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}
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// ChildAt returns the child that contains the specified x and y coordinates. If
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// there are no children at the coordinates, this method will return nil.
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func (element *Container) ChildAt (point image.Point) (child elements.Element) {
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for _, entry := range element.children {
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if point.In(entry.Bounds) {
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child = entry.Element
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}
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}
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return
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}
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func (element *Container) childPosition (child elements.Element) (position image.Point) {
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for _, entry := range element.children {
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if entry.Element == child {
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position = entry.Bounds.Min
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break
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}
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}
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return
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}
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func (element *Container) redoAll () {
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// do a layout
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element.recalculate()
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// draw a background
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bounds := element.Bounds()
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pattern, _ := theme.BackgroundPattern (theme.PatternState {
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Case: containerCase,
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})
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artist.FillRectangle(element, pattern, bounds)
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// cut our canvas up and give peices to child elements
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for _, entry := range element.children {
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entry.DrawTo(canvas.Cut(element, entry.Bounds))
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}
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}
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func (element *Container) HandleMouseDown (x, y int, button input.Button) {
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child, handlesMouse := element.ChildAt(image.Pt(x, y)).(elements.MouseTarget)
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if !handlesMouse { return }
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element.drags[button] = child
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child.HandleMouseDown(x, y, button)
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}
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func (element *Container) HandleMouseUp (x, y int, button input.Button) {
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child := element.drags[button]
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if child == nil { return }
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element.drags[button] = nil
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child.HandleMouseUp(x, y, button)
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}
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func (element *Container) HandleMouseMove (x, y int) {
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for _, child := range element.drags {
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if child == nil { continue }
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child.HandleMouseMove(x, y)
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}
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}
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func (element *Container) HandleMouseScroll (x, y int, deltaX, deltaY float64) {
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child, handlesMouse := element.ChildAt(image.Pt(x, y)).(elements.MouseTarget)
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if !handlesMouse { return }
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child.HandleMouseScroll(x, y, deltaX, deltaY)
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}
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func (element *Container) HandleKeyDown (key input.Key, modifiers input.Modifiers) {
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element.forFocused (func (child elements.Focusable) bool {
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child0, handlesKeyboard := child.(elements.KeyboardTarget)
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if handlesKeyboard {
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child0.HandleKeyDown(key, modifiers)
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}
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return true
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})
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}
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func (element *Container) HandleKeyUp (key input.Key, modifiers input.Modifiers) {
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element.forFocused (func (child elements.Focusable) bool {
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child0, handlesKeyboard := child.(elements.KeyboardTarget)
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if handlesKeyboard {
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child0.HandleKeyUp(key, modifiers)
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}
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return true
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})
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}
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func (element *Container) FlexibleHeightFor (width int) (height int) {
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return element.layout.FlexibleHeightFor (
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element.children,
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theme.Margin(), width)
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}
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func (element *Container) OnFlexibleHeightChange (callback func ()) {
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element.onFlexibleHeightChange = callback
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}
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func (element *Container) Focused () (focused bool) {
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return element.focused
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}
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func (element *Container) Focus () {
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if element.onFocusRequest != nil {
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element.onFocusRequest()
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}
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}
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func (element *Container) HandleFocus (direction input.KeynavDirection) (ok bool) {
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if !element.focusable { return false }
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direction = direction.Canon()
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firstFocused := element.firstFocused()
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if firstFocused < 0 {
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// no element is currently focused, so we need to focus either
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// the first or last focusable element depending on the
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// direction.
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switch direction {
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case input.KeynavDirectionNeutral, input.KeynavDirectionForward:
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// if we recieve a neutral or forward direction, focus
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// the first focusable element.
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return element.focusFirstFocusableElement(direction)
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case input.KeynavDirectionBackward:
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// if we recieve a backward direction, focus the last
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// focusable element.
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return element.focusLastFocusableElement(direction)
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}
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} else {
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// an element is currently focused, so we need to move the
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// focus in the specified direction
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firstFocusedChild :=
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element.children[firstFocused].Element.(elements.Focusable)
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// before we move the focus, the currently focused child
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// may also be able to move its focus. if the child is able
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// to do that, we will let it and not move ours.
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if firstFocusedChild.HandleFocus(direction) {
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return true
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}
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// find the previous/next focusable element relative to the
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// currently focused element, if it exists.
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for index := firstFocused + int(direction);
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index < len(element.children) && index >= 0;
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index += int(direction) {
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child, focusable :=
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element.children[index].
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Element.(elements.Focusable)
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if focusable && child.HandleFocus(direction) {
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// we have found one, so we now actually move
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// the focus.
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firstFocusedChild.HandleUnfocus()
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element.focused = true
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return true
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}
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}
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}
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return false
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}
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func (element *Container) focusFirstFocusableElement (
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direction input.KeynavDirection,
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) (
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ok bool,
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) {
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element.forFocusable (func (child elements.Focusable) bool {
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if child.HandleFocus(direction) {
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element.focused = true
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ok = true
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return false
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}
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return true
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})
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return
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}
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func (element *Container) focusLastFocusableElement (
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direction input.KeynavDirection,
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) (
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ok bool,
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) {
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element.forFocusableBackward (func (child elements.Focusable) bool {
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if child.HandleFocus(direction) {
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element.focused = true
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ok = true
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return false
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}
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return true
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})
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return
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}
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func (element *Container) HandleUnfocus () {
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element.focused = false
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element.forFocused (func (child elements.Focusable) bool {
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child.HandleUnfocus()
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return true
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})
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}
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func (element *Container) OnFocusRequest (callback func () (granted bool)) {
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element.onFocusRequest = callback
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}
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func (element *Container) OnFocusMotionRequest (
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callback func (direction input.KeynavDirection) (granted bool),
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) {
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element.onFocusMotionRequest = callback
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}
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func (element *Container) forFocused (callback func (child elements.Focusable) bool) {
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for _, entry := range element.children {
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child, focusable := entry.Element.(elements.Focusable)
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if focusable && child.Focused() {
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if !callback(child) { break }
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}
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}
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}
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func (element *Container) forFocusable (callback func (child elements.Focusable) bool) {
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for _, entry := range element.children {
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child, focusable := entry.Element.(elements.Focusable)
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if focusable {
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if !callback(child) { break }
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}
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}
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}
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func (element *Container) forFlexible (callback func (child elements.Flexible) bool) {
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for _, entry := range element.children {
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child, flexible := entry.Element.(elements.Flexible)
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if flexible {
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if !callback(child) { break }
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}
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}
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}
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func (element *Container) forFocusableBackward (callback func (child elements.Focusable) bool) {
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for index := len(element.children) - 1; index >= 0; index -- {
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child, focusable := element.children[index].Element.(elements.Focusable)
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if focusable {
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if !callback(child) { break }
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}
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}
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}
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func (element *Container) firstFocused () (index int) {
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for currentIndex, entry := range element.children {
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child, focusable := entry.Element.(elements.Focusable)
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if focusable && child.Focused() {
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return currentIndex
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}
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}
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return -1
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}
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func (element *Container) reflectChildProperties () {
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element.focusable = false
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element.forFocusable (func (elements.Focusable) bool {
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element.focusable = true
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return false
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})
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element.flexible = false
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element.forFlexible (func (elements.Flexible) bool {
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element.flexible = true
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return false
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})
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if !element.focusable {
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element.focused = false
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}
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}
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func (element *Container) childFocusRequestCallback (
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child elements.Focusable,
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) (
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granted bool,
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) {
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if element.onFocusRequest != nil && element.onFocusRequest() {
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element.forFocused (func (child elements.Focusable) bool {
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child.HandleUnfocus()
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return true
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})
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child.HandleFocus(input.KeynavDirectionNeutral)
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return true
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} else {
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return false
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}
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}
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func (element *Container) updateMinimumSize () {
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width, height := element.layout.MinimumSize (
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element.children, theme.Margin())
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if element.flexible {
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height = element.layout.FlexibleHeightFor (
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element.children, theme.Margin(), width)
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}
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element.core.SetMinimumSize(width, height)
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}
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func (element *Container) recalculate () {
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element.layout.Arrange (
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element.children, theme.Margin(), element.Bounds())
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}
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