Sasha Koshka
01d8b64b24
Core actually now fulfills the Element interface on its own which is pretty cool.
141 lines
3.4 KiB
Go
141 lines
3.4 KiB
Go
package core
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import "image"
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import "image/color"
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import "git.tebibyte.media/sashakoshka/tomo"
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// Core is a struct that implements some core functionality common to most
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// widgets. It is meant to be embedded directly into a struct.
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type Core struct {
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canvas tomo.BasicCanvas
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parent tomo.Element
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metrics struct {
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minimumWidth int
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minimumHeight int
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}
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selectable bool
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selected bool
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hooks tomo.ParentHooks
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}
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// NewCore creates a new element core and its corresponding control.
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func NewCore (parent tomo.Element) (core *Core, control CoreControl) {
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core = &Core { parent: parent }
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control = CoreControl { core: core }
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return
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}
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func (core *Core) ColorModel () (model color.Model) {
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return color.RGBAModel
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}
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func (core *Core) At (x, y int) (pixel color.Color) {
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return core.canvas.At(x, y)
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}
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func (core *Core) Bounds () (bounds image.Rectangle) {
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return core.canvas.Bounds()
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}
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func (core *Core) Set (x, y int, c color.Color) () {
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core.canvas.Set(x, y, c)
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}
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func (core *Core) Buffer () (data []color.RGBA, stride int) {
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return core.canvas.Buffer()
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}
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func (core *Core) MinimumSize () (width, height int) {
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return core.metrics.minimumWidth, core.metrics.minimumHeight
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}
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func (core *Core) Resize (width, height int) {
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if width < core.metrics.minimumWidth {
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width = core.metrics.minimumWidth
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}
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if height < core.metrics.minimumHeight {
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height = core.metrics.minimumHeight
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}
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bounds := core.canvas.Bounds()
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if width != bounds.Dx() || height != bounds.Dy() {
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core.canvas = tomo.NewBasicCanvas(width, height)
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}
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}
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func (core *Core) SetParentHooks (hooks tomo.ParentHooks) {
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core.hooks = hooks
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}
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// CoreControl is a struct that can exert control over a control struct. It can
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// be used as a canvas. It must not be directly embedded into an element, but
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// instead kept as a private member.
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type CoreControl struct {
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tomo.BasicCanvas
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core *Core
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}
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func (control CoreControl) HasImage () (empty bool) {
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return !control.Bounds().Empty()
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}
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func (control CoreControl) PushRegion (bounds image.Rectangle) {
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control.core.hooks.RunDraw(tomo.Cut(control, bounds))
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}
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func (control CoreControl) PushAll () {
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control.PushRegion(control.Bounds())
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}
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func (control *CoreControl) AllocateCanvas (width, height int) {
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core := control.core
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width, height, _ = control.ConstrainSize(width, height)
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core.canvas = tomo.NewBasicCanvas(width, height)
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control.BasicCanvas = core.canvas
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}
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func (control CoreControl) SetMinimumSize (width, height int) {
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core := control.core
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if width == core.metrics.minimumWidth &&
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height == core.metrics.minimumHeight {
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return
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}
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core.metrics.minimumWidth = width
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core.metrics.minimumHeight = height
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core.hooks.RunMinimumSizeChange(width, height)
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// if there is an image buffer, and the current size is less
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// than this new minimum size, send core.parent a resize event.
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if control.HasImage() {
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bounds := control.Bounds()
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imageWidth,
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imageHeight,
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constrained := control.ConstrainSize(bounds.Dx(), bounds.Dy())
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if constrained {
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core.parent.Resize(imageWidth, imageHeight)
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}
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}
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}
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func (control CoreControl) ConstrainSize (
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inWidth, inHeight int,
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) (
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outWidth, outHeight int,
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constrained bool,
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) {
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core := control.core
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outWidth = inWidth
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outHeight = inHeight
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if outWidth < core.metrics.minimumWidth {
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outWidth = core.metrics.minimumWidth
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constrained = true
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}
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if outHeight < core.metrics.minimumHeight {
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outHeight = core.metrics.minimumHeight
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constrained = true
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}
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return
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}
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