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tomo-old/elements/basic/container.go

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package basic
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import "image"
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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.
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type Container struct {
*core.Core
core core.CoreControl
layout tomo.Layout
children []tomo.LayoutEntry
drags [10]tomo.Element
warping bool
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}
// NewContainer creates a new container.
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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.
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func (element *Container) SetLayout (layout tomo.Layout) {
element.layout = layout
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if element.core.HasImage() {
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element.recalculate()
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element.draw()
element.core.PushAll()
}
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}
// 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.
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func (element *Container) Adopt (child tomo.Element, expand bool) {
child.SetParentHooks (tomo.ParentHooks {
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MinimumSizeChange: func (int, int) {
element.updateMinimumSize()
},
SelectabilityChange: func (bool) {
element.updateSelectable()
},
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SelectionRequest: func () (granted bool) {
if !child.Selectable() { return }
if element.core.Select() {
element.propogateToSelected(tomo.EventDeselect { })
child.Handle(tomo.EventSelect { })
return true
}
return
},
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Draw: func (region tomo.Image) {
element.drawChildRegion(child, region)
},
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})
element.children = append (element.children, tomo.LayoutEntry {
Element: child,
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Expand: expand,
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})
element.updateMinimumSize()
element.updateSelectable()
if element.core.HasImage() && !element.warping {
element.recalculate()
element.draw()
element.core.PushAll()
}
}
// 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.
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if element.core.HasImage() {
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element.recalculate()
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element.draw()
element.core.PushAll()
}
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}
// 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 {
entry.SetParentHooks(tomo.ParentHooks { })
element.children = append (
element.children[:index],
element.children[index + 1:]...)
break
}
}
element.updateMinimumSize()
element.updateSelectable()
if element.core.HasImage() && !element.warping {
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element.recalculate()
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element.draw()
element.core.PushAll()
}
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}
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// DisownAll removes all child elements from the container at once.
func (element *Container) DisownAll () {
element.children = nil
element.updateMinimumSize()
element.updateSelectable()
if element.core.HasImage() && !element.warping {
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element.recalculate()
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element.draw()
element.core.PushAll()
}
}
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// 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
}
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// 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
}
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func (element *Container) Handle (event tomo.Event) {
switch event.(type) {
case tomo.EventResize:
resizeEvent := event.(tomo.EventResize)
element.core.AllocateCanvas (
resizeEvent.Width,
resizeEvent.Height)
element.recalculate()
element.draw()
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case tomo.EventMouseDown:
mouseDownEvent := event.(tomo.EventMouseDown)
child := element.ChildAt (image.Pt (
mouseDownEvent.X,
mouseDownEvent.Y))
if child == nil { break }
element.drags[mouseDownEvent.Button] = child
childPosition := element.childPosition(child)
child.Handle (tomo.EventMouseDown {
Button: mouseDownEvent.Button,
X: mouseDownEvent.X - childPosition.X,
Y: mouseDownEvent.Y - childPosition.Y,
})
case tomo.EventMouseUp:
mouseUpEvent := event.(tomo.EventMouseUp)
child := element.drags[mouseUpEvent.Button]
if child == nil { break }
element.drags[mouseUpEvent.Button] = nil
childPosition := element.childPosition(child)
child.Handle (tomo.EventMouseUp {
Button: mouseUpEvent.Button,
X: mouseUpEvent.X - childPosition.X,
Y: mouseUpEvent.Y - childPosition.Y,
})
case tomo.EventMouseMove:
mouseMoveEvent := event.(tomo.EventMouseMove)
for _, child := range element.drags {
if child == nil { continue }
childPosition := element.childPosition(child)
child.Handle (tomo.EventMouseMove {
X: mouseMoveEvent.X - childPosition.X,
Y: mouseMoveEvent.Y - childPosition.Y,
})
}
case tomo.EventSelect:
if !element.Selectable() { break }
element.core.SetSelected(true)
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// select the first selectable element
for _, entry := range element.children {
if entry.Selectable() {
entry.Handle(event)
break
}
}
case tomo.EventDeselect:
element.core.SetSelected(false)
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element.propogateToSelected(event)
default:
// other events are just directly sent to the selected child.
element.propogateToSelected(event)
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}
return
}
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func (element *Container) propogateToSelected (event tomo.Event) {
for _, entry := range element.children {
if entry.Selected() {
entry.Handle(event)
}
}
}
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func (element *Container) AdvanceSelection (direction int) (ok bool) {
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if !element.Selectable() { return }
firstSelected := element.firstSelected()
if firstSelected < 0 {
for _, entry := range element.children {
if entry.Selectable() {
entry.Handle(tomo.EventSelect { })
return true
}
}
} else {
nextSelectable := -1
step := 1
if direction < 0 { step = - 1 }
for index := firstSelected + step;
index < len(element.children) && index > 0;
index += step {
if element.children[index].Selectable() {
nextSelectable = index
break
}
}
if nextSelectable > 0 {
element.children[firstSelected ].Handle(tomo.EventDeselect { })
element.children[nextSelectable].Handle(tomo.EventSelect { })
return true
}
}
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return
}
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func (element *Container) firstSelected () (index int) {
for currentIndex, entry := range element.children {
if entry.Selected() {
return currentIndex
}
}
return -1
}
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func (element *Container) updateSelectable () {
selectable := false
for _, entry := range element.children {
if entry.Selectable() { selectable = true }
}
element.core.SetSelectable(selectable)
}
func (element *Container) updateMinimumSize () {
element.core.SetMinimumSize(element.layout.MinimumSize(element.children))
}
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.Rectangle (
element.core,
theme.BackgroundImage(),
nil, 0,
bounds)
for _, entry := range element.children {
artist.Paste(element.core, entry, entry.Position)
}
}
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func (element *Container) drawChildRegion (child tomo.Element, region tomo.Image) {
if element.warping { return }
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for _, entry := range element.children {
if entry.Element == child {
artist.Paste(element.core, region, entry.Position)
element.core.PushRegion (
region.Bounds().Add(entry.Position))
break
}
}
}