462 lines
12 KiB
Go
462 lines
12 KiB
Go
package basic
|
|
|
|
import "image"
|
|
import "git.tebibyte.media/sashakoshka/tomo"
|
|
import "git.tebibyte.media/sashakoshka/tomo/theme"
|
|
import "git.tebibyte.media/sashakoshka/tomo/artist"
|
|
import "git.tebibyte.media/sashakoshka/tomo/elements/core"
|
|
|
|
// Container is an element capable of containg other elements, and arranging
|
|
// them in a layout.
|
|
type Container struct {
|
|
*core.Core
|
|
core core.CoreControl
|
|
|
|
layout tomo.Layout
|
|
children []tomo.LayoutEntry
|
|
drags [10]tomo.MouseTarget
|
|
warping bool
|
|
selected bool
|
|
selectable bool
|
|
flexible bool
|
|
|
|
onSelectionRequest func () (granted bool)
|
|
onSelectionMotionRequest func (tomo.SelectionDirection) (granted bool)
|
|
onFlexibleHeightChange func ()
|
|
}
|
|
|
|
// NewContainer creates a new container.
|
|
func NewContainer (layout tomo.Layout) (element *Container) {
|
|
element = &Container { }
|
|
element.Core, element.core = core.NewCore(element)
|
|
element.SetLayout(layout)
|
|
return
|
|
}
|
|
|
|
// SetLayout sets the layout of this container.
|
|
func (element *Container) SetLayout (layout tomo.Layout) {
|
|
element.layout = layout
|
|
if element.core.HasImage() {
|
|
element.recalculate()
|
|
element.draw()
|
|
element.core.DamageAll()
|
|
}
|
|
}
|
|
|
|
// Adopt adds a new child element to the container. If expand is set to true,
|
|
// the element will expand (instead of contract to its minimum size), in
|
|
// whatever way is defined by the current layout.
|
|
func (element *Container) Adopt (child tomo.Element, expand bool) {
|
|
// set event handlers
|
|
child.OnDamage (func (region tomo.Canvas) {
|
|
element.drawChildRegion(child, region)
|
|
})
|
|
child.OnMinimumSizeChange(element.updateMinimumSize)
|
|
if child0, ok := child.(tomo.Flexible); ok {
|
|
child0.OnFlexibleHeightChange(element.updateMinimumSize)
|
|
}
|
|
if child0, ok := child.(tomo.Selectable); ok {
|
|
child0.OnSelectionRequest (func () (granted bool) {
|
|
return element.childSelectionRequestCallback(child0)
|
|
})
|
|
child0.OnSelectionMotionRequest (
|
|
func (direction tomo.SelectionDirection) (granted bool) {
|
|
if element.onSelectionMotionRequest == nil { return }
|
|
return element.onSelectionMotionRequest(direction)
|
|
})
|
|
}
|
|
|
|
// add child
|
|
element.children = append (element.children, tomo.LayoutEntry {
|
|
Element: child,
|
|
Expand: expand,
|
|
})
|
|
|
|
// refresh stale data
|
|
element.updateMinimumSize()
|
|
element.reflectChildProperties()
|
|
if element.core.HasImage() && !element.warping {
|
|
element.recalculate()
|
|
element.draw()
|
|
element.core.DamageAll()
|
|
}
|
|
}
|
|
|
|
// Warp runs the specified callback, deferring all layout and rendering updates
|
|
// until the callback has finished executing. This allows for aplications to
|
|
// perform batch gui updates without flickering and stuff.
|
|
func (element *Container) Warp (callback func ()) {
|
|
if element.warping {
|
|
callback()
|
|
return
|
|
}
|
|
|
|
element.warping = true
|
|
callback()
|
|
element.warping = false
|
|
|
|
// TODO: create some sort of task list so we don't do a full recalculate
|
|
// and redraw every time, because although that is the most likely use
|
|
// case, it is not the only one.
|
|
if element.core.HasImage() {
|
|
element.recalculate()
|
|
element.draw()
|
|
element.core.DamageAll()
|
|
}
|
|
}
|
|
|
|
// Disown removes the given child from the container if it is contained within
|
|
// it.
|
|
func (element *Container) Disown (child tomo.Element) {
|
|
for index, entry := range element.children {
|
|
if entry.Element == child {
|
|
element.clearChildEventHandlers(entry.Element)
|
|
element.children = append (
|
|
element.children[:index],
|
|
element.children[index + 1:]...)
|
|
break
|
|
}
|
|
}
|
|
|
|
element.updateMinimumSize()
|
|
element.reflectChildProperties()
|
|
if element.core.HasImage() && !element.warping {
|
|
element.recalculate()
|
|
element.draw()
|
|
element.core.DamageAll()
|
|
}
|
|
}
|
|
|
|
func (element *Container) clearChildEventHandlers (child tomo.Element) {
|
|
child.OnDamage(nil)
|
|
child.OnMinimumSizeChange(nil)
|
|
if child0, ok := child.(tomo.Selectable); ok {
|
|
child0.OnSelectionRequest(nil)
|
|
child0.OnSelectionMotionRequest(nil)
|
|
if child0.Selected() {
|
|
child0.HandleDeselection()
|
|
}
|
|
}
|
|
if child0, ok := child.(tomo.Flexible); ok {
|
|
child0.OnFlexibleHeightChange(nil)
|
|
}
|
|
}
|
|
|
|
// DisownAll removes all child elements from the container at once.
|
|
func (element *Container) DisownAll () {
|
|
element.children = nil
|
|
|
|
element.updateMinimumSize()
|
|
element.reflectChildProperties()
|
|
if element.core.HasImage() && !element.warping {
|
|
element.recalculate()
|
|
element.draw()
|
|
element.core.DamageAll()
|
|
}
|
|
}
|
|
|
|
// Children returns a slice containing this element's children.
|
|
func (element *Container) Children () (children []tomo.Element) {
|
|
children = make([]tomo.Element, len(element.children))
|
|
for index, entry := range element.children {
|
|
children[index] = entry.Element
|
|
}
|
|
return
|
|
}
|
|
|
|
// CountChildren returns the amount of children contained within this element.
|
|
func (element *Container) CountChildren () (count int) {
|
|
return len(element.children)
|
|
}
|
|
|
|
// Child returns the child at the specified index. If the index is out of
|
|
// bounds, this method will return nil.
|
|
func (element *Container) Child (index int) (child tomo.Element) {
|
|
if index < 0 || index > len(element.children) { return }
|
|
return element.children[index].Element
|
|
}
|
|
|
|
// ChildAt returns the child that contains the specified x and y coordinates. If
|
|
// there are no children at the coordinates, this method will return nil.
|
|
func (element *Container) ChildAt (point image.Point) (child tomo.Element) {
|
|
for _, entry := range element.children {
|
|
if point.In(entry.Bounds().Add(entry.Position)) {
|
|
child = entry.Element
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
func (element *Container) childPosition (child tomo.Element) (position image.Point) {
|
|
for _, entry := range element.children {
|
|
if entry.Element == child {
|
|
position = entry.Position
|
|
break
|
|
}
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
func (element *Container) Resize (width, height int) {
|
|
element.core.AllocateCanvas(width, height)
|
|
element.recalculate()
|
|
element.draw()
|
|
}
|
|
|
|
func (element *Container) HandleMouseDown (x, y int, button tomo.Button) {
|
|
child, handlesMouse := element.ChildAt(image.Pt(x, y)).(tomo.MouseTarget)
|
|
if !handlesMouse { return }
|
|
element.drags[button] = child
|
|
childPosition := element.childPosition(child)
|
|
child.HandleMouseDown(x - childPosition.X, y - childPosition.Y, button)
|
|
}
|
|
|
|
func (element *Container) HandleMouseUp (x, y int, button tomo.Button) {
|
|
child := element.drags[button]
|
|
if child == nil { return }
|
|
element.drags[button] = nil
|
|
childPosition := element.childPosition(child)
|
|
child.HandleMouseUp(x - childPosition.X, y - childPosition.Y, button)
|
|
}
|
|
|
|
func (element *Container) HandleMouseMove (x, y int) {
|
|
for _, child := range element.drags {
|
|
if child == nil { continue }
|
|
childPosition := element.childPosition(child)
|
|
child.HandleMouseMove(x - childPosition.X, y - childPosition.Y)
|
|
}
|
|
}
|
|
|
|
func (element *Container) HandleMouseScroll (x, y int, deltaX, deltaY float64) {
|
|
child, handlesMouse := element.ChildAt(image.Pt(x, y)).(tomo.MouseTarget)
|
|
if !handlesMouse { return }
|
|
childPosition := element.childPosition(child)
|
|
child.HandleMouseScroll(x - childPosition.X, y - childPosition.Y, deltaX, deltaY)
|
|
}
|
|
|
|
func (element *Container) HandleKeyDown (key tomo.Key, modifiers tomo.Modifiers) {
|
|
element.forSelected (func (child tomo.Selectable) bool {
|
|
child0, handlesKeyboard := child.(tomo.KeyboardTarget)
|
|
if handlesKeyboard {
|
|
child0.HandleKeyDown(key, modifiers)
|
|
}
|
|
return true
|
|
})
|
|
}
|
|
|
|
func (element *Container) HandleKeyUp (key tomo.Key, modifiers tomo.Modifiers) {
|
|
element.forSelected (func (child tomo.Selectable) bool {
|
|
child0, handlesKeyboard := child.(tomo.KeyboardTarget)
|
|
if handlesKeyboard {
|
|
child0.HandleKeyUp(key, modifiers)
|
|
}
|
|
return true
|
|
})
|
|
}
|
|
|
|
func (element *Container) Selected () (selected bool) {
|
|
return element.selected
|
|
}
|
|
|
|
func (element *Container) Select () {
|
|
if element.onSelectionRequest != nil {
|
|
element.onSelectionRequest()
|
|
}
|
|
}
|
|
|
|
func (element *Container) HandleSelection (direction tomo.SelectionDirection) (ok bool) {
|
|
if !element.selectable { return false }
|
|
direction = direction.Canon()
|
|
|
|
firstSelected := element.firstSelected()
|
|
if firstSelected < 0 {
|
|
found := false
|
|
switch direction {
|
|
case tomo.SelectionDirectionBackward:
|
|
element.forSelectableBackward (func (child tomo.Selectable) bool {
|
|
if child.HandleSelection(direction) {
|
|
element.selected = true
|
|
found = true
|
|
return false
|
|
}
|
|
return true
|
|
})
|
|
return true
|
|
|
|
case tomo.SelectionDirectionNeutral, tomo.SelectionDirectionForward:
|
|
element.forSelectable (func (child tomo.Selectable) bool {
|
|
if child.HandleSelection(direction) {
|
|
element.selected = true
|
|
found = true
|
|
return false
|
|
}
|
|
return true
|
|
})
|
|
}
|
|
return found
|
|
} else {
|
|
firstSelectedChild :=
|
|
element.children[firstSelected].Element.(tomo.Selectable)
|
|
|
|
for index := firstSelected + int(direction);
|
|
index < len(element.children) && index >= 0;
|
|
index += int(direction) {
|
|
|
|
child, selectable :=
|
|
element.children[index].
|
|
Element.(tomo.Selectable)
|
|
if selectable && child.HandleSelection(direction) {
|
|
firstSelectedChild.HandleDeselection()
|
|
element.selected = true
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
func (element *Container) FlexibleHeightFor (width int) (height int) {
|
|
return element.layout.FlexibleHeightFor(element.children, width)
|
|
}
|
|
|
|
func (element *Container) OnFlexibleHeightChange (callback func ()) {
|
|
element.onFlexibleHeightChange = callback
|
|
}
|
|
|
|
func (element *Container) HandleDeselection () {
|
|
element.selected = false
|
|
element.forSelected (func (child tomo.Selectable) bool {
|
|
child.HandleDeselection()
|
|
return true
|
|
})
|
|
}
|
|
|
|
func (element *Container) OnSelectionRequest (callback func () (granted bool)) {
|
|
element.onSelectionRequest = callback
|
|
}
|
|
|
|
func (element *Container) OnSelectionMotionRequest (
|
|
callback func (direction tomo.SelectionDirection) (granted bool),
|
|
) {
|
|
element.onSelectionMotionRequest = callback
|
|
}
|
|
|
|
func (element *Container) forSelected (callback func (child tomo.Selectable) bool) {
|
|
for _, entry := range element.children {
|
|
child, selectable := entry.Element.(tomo.Selectable)
|
|
if selectable && child.Selected() {
|
|
if !callback(child) { break }
|
|
}
|
|
}
|
|
}
|
|
|
|
func (element *Container) forSelectable (callback func (child tomo.Selectable) bool) {
|
|
for _, entry := range element.children {
|
|
child, selectable := entry.Element.(tomo.Selectable)
|
|
if selectable {
|
|
if !callback(child) { break }
|
|
}
|
|
}
|
|
}
|
|
|
|
func (element *Container) forFlexible (callback func (child tomo.Flexible) bool) {
|
|
for _, entry := range element.children {
|
|
child, selectable := entry.Element.(tomo.Flexible)
|
|
if selectable {
|
|
if !callback(child) { break }
|
|
}
|
|
}
|
|
}
|
|
|
|
func (element *Container) forSelectableBackward (callback func (child tomo.Selectable) bool) {
|
|
for index := len(element.children) - 1; index >= 0; index -- {
|
|
child, selectable := element.children[index].Element.(tomo.Selectable)
|
|
if selectable {
|
|
if !callback(child) { break }
|
|
}
|
|
}
|
|
}
|
|
|
|
func (element *Container) firstSelected () (index int) {
|
|
for currentIndex, entry := range element.children {
|
|
child, selectable := entry.Element.(tomo.Selectable)
|
|
if selectable && child.Selected() {
|
|
return currentIndex
|
|
}
|
|
}
|
|
return -1
|
|
}
|
|
|
|
func (element *Container) reflectChildProperties () {
|
|
element.selectable = false
|
|
element.forSelectable (func (tomo.Selectable) bool {
|
|
element.selectable = true
|
|
return false
|
|
})
|
|
element.flexible = false
|
|
element.forFlexible (func (tomo.Flexible) bool {
|
|
element.flexible = true
|
|
return false
|
|
})
|
|
if !element.selectable {
|
|
element.selected = false
|
|
}
|
|
}
|
|
|
|
func (element *Container) childSelectionRequestCallback (
|
|
child tomo.Selectable,
|
|
) (
|
|
granted bool,
|
|
) {
|
|
if element.onSelectionRequest != nil && element.onSelectionRequest() {
|
|
element.forSelected (func (child tomo.Selectable) bool {
|
|
child.HandleDeselection()
|
|
return true
|
|
})
|
|
child.HandleSelection(tomo.SelectionDirectionNeutral)
|
|
return true
|
|
} else {
|
|
return false
|
|
}
|
|
}
|
|
|
|
func (element *Container) updateMinimumSize () {
|
|
width, height := element.layout.MinimumSize(element.children)
|
|
if element.flexible {
|
|
height = element.layout.FlexibleHeightFor(element.children, width)
|
|
}
|
|
element.core.SetMinimumSize(width, height)
|
|
}
|
|
|
|
func (element *Container) recalculate () {
|
|
bounds := element.Bounds()
|
|
element.layout.Arrange(element.children, bounds.Dx(), bounds.Dy())
|
|
}
|
|
|
|
func (element *Container) draw () {
|
|
bounds := element.core.Bounds()
|
|
|
|
artist.FillRectangle (
|
|
element.core,
|
|
theme.BackgroundPattern(),
|
|
bounds)
|
|
|
|
for _, entry := range element.children {
|
|
artist.Paste(element.core, entry, entry.Position)
|
|
}
|
|
}
|
|
|
|
func (element *Container) drawChildRegion (child tomo.Element, region tomo.Canvas) {
|
|
if element.warping { return }
|
|
for _, entry := range element.children {
|
|
if entry.Element == child {
|
|
artist.Paste(element.core, region, entry.Position)
|
|
element.core.DamageRegion (
|
|
region.Bounds().Add(entry.Position))
|
|
break
|
|
}
|
|
}
|
|
}
|