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Moved element core to new package

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This commit is contained in:
Sasha Koshka
2023-01-09 21:25:11 -05:00
parent bbdc5a0162
commit 34848f616b
5 changed files with 14 additions and 10 deletions
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7
elements/basic/button.go
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@@ -4,10 +4,11 @@ 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"
type Button struct {
*Core
core CoreControl
*core.Core
core core.CoreControl
pressed bool
enabled bool
@@ -20,7 +21,7 @@ type Button struct {
func NewButton (text string) (element *Button) {
element = &Button { enabled: true }
element.Core, element.core = NewCore(element)
element.Core, element.core = core.NewCore(element)
element.drawer.SetFace(theme.FontFaceRegular())
element.SetText(text)
return

135
elements/basic/core.go
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@@ -1,135 +0,0 @@
package basic
import "image"
import "image/color"
import "git.tebibyte.media/sashakoshka/tomo"
// Core is a struct that implements some core functionality common to most
// widgets. It is meant to be embedded directly into a struct.
type Core struct {
canvas *image.RGBA
parent tomo.Element
metrics struct {
minimumWidth int
minimumHeight int
}
hooks tomo.ParentHooks
}
// NewCore creates a new element core and its corresponding control.
func NewCore (parent tomo.Element) (core *Core, control CoreControl) {
core = &Core { parent: parent }
control = CoreControl { core: core }
return
}
func (core Core) ColorModel () (model color.Model) {
return color.RGBAModel
}
func (core Core) At (x, y int) (pixel color.Color) {
if core.canvas == nil { return color.RGBA { } }
pixel = core.canvas.At(x, y)
return
}
func (core Core) RGBAAt (x, y int) (pixel color.RGBA) {
if core.canvas == nil { return color.RGBA { } }
pixel = core.canvas.RGBAAt(x, y)
return
}
func (core Core) Bounds () (bounds image.Rectangle) {
if core.canvas != nil { bounds = core.canvas.Bounds() }
return
}
func (core *Core) SetParentHooks (hooks tomo.ParentHooks) {
core.hooks = hooks
}
func (core Core) MinimumSize () (width, height int) {
return core.metrics.minimumWidth, core.metrics.minimumHeight
}
// CoreControl is a struct that can exert control over a control struct. It can
// be used as a canvas. It must not be directly embedded into an element, but
// instead kept as a private member.
type CoreControl struct {
*image.RGBA
core *Core
}
func (control CoreControl) HasImage () (has bool) {
has = control.RGBA != nil
return
}
func (control CoreControl) Select () {
control.core.hooks.RunSelectionRequest()
}
func (control CoreControl) PushRegion (bounds image.Rectangle) {
control.core.hooks.RunDraw(control.SubImage(bounds).(*image.RGBA))
}
func (control CoreControl) PushAll () {
control.PushRegion(control.Bounds())
}
func (control *CoreControl) AllocateCanvas (width, height int) {
core := control.core
width, height, _ = control.ConstrainSize(width, height)
core.canvas = image.NewRGBA(image.Rect (0, 0, width, height))
control.RGBA = core.canvas
}
func (control CoreControl) SetMinimumSize (width, height int) {
core := control.core
if width != core.metrics.minimumWidth ||
height != core.metrics.minimumHeight {
core.metrics.minimumWidth = width
core.metrics.minimumHeight = height
core.hooks.RunMinimumSizeChange(width, height)
// if there is an image buffer, and the current size is less
// than this new minimum size, send core.parent a resize event.
if control.HasImage() {
bounds := control.Bounds()
imageWidth,
imageHeight,
constrained := control.ConstrainSize (
bounds.Dx(),
bounds.Dy())
if constrained {
core.parent.Handle (tomo.EventResize {
Width: imageWidth,
Height: imageHeight,
})
}
}
}
}
func (control CoreControl) ConstrainSize (
inWidth, inHeight int,
) (
outWidth, outHeight int,
constrained bool,
) {
core := control.core
outWidth = inWidth
outHeight = inHeight
if outWidth < core.metrics.minimumWidth {
outWidth = core.metrics.minimumWidth
constrained = true
}
if outHeight < core.metrics.minimumHeight {
outHeight = core.metrics.minimumHeight
constrained = true
}
return
}

7
elements/basic/label.go
View File

@@ -4,10 +4,11 @@ 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"
type Label struct {
*Core
core CoreControl
*core.Core
core core.CoreControl
text string
drawer artist.TextDrawer
@@ -15,7 +16,7 @@ type Label struct {
func NewLabel (text string) (element *Label) {
element = &Label { }
element.Core, element.core = NewCore(element)
element.Core, element.core = core.NewCore(element)
face := theme.FontFaceRegular()
element.drawer.SetFace(face)
element.SetText(text)

7
elements/basic/test.go
View File

@@ -4,17 +4,18 @@ import "image"
import "image/color"
import "git.tebibyte.media/sashakoshka/tomo"
import "git.tebibyte.media/sashakoshka/tomo/artist"
import "git.tebibyte.media/sashakoshka/tomo/elements/core"
// Test is a simple element that can be used as a placeholder.
type Test struct {
*Core
core CoreControl
*core.Core
core core.CoreControl
}
// NewTest creates a new test element.
func NewTest () (element *Test) {
element = &Test { }
element.Core, element.core = NewCore(element)
element.Core, element.core = core.NewCore(element)
element.core.SetMinimumSize(32, 32)
return
}