350 lines
8.5 KiB
Go
350 lines
8.5 KiB
Go
package system
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import "image"
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import "image/color"
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import "golang.org/x/image/font"
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import "git.tebibyte.media/tomo/tomo"
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import "golang.org/x/image/math/fixed"
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import "git.tebibyte.media/tomo/typeset"
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import "git.tebibyte.media/tomo/tomo/text"
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import "git.tebibyte.media/tomo/tomo/input"
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import "git.tebibyte.media/tomo/tomo/event"
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import "git.tebibyte.media/tomo/tomo/canvas"
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type textBox struct {
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*box
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hOverflow, vOverflow bool
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contentBounds image.Rectangle
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scroll image.Point
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text string
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textColor color.Color
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face font.Face
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wrap bool
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hAlign tomo.Align
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vAlign tomo.Align
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selectable bool
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selecting bool
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selectStart int
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dot text.Dot
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dotColor color.Color
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drawer typeset.Drawer
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on struct {
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contentBoundsChange event.FuncBroadcaster
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dotChange event.FuncBroadcaster
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}
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}
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func (this *System) NewTextBox () tomo.TextBox {
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box := &textBox {
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textColor: color.Black,
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dotColor: color.RGBA { B: 255, G: 255, A: 255 },
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}
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box.box = this.newBox(box)
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return box
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}
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func (this *textBox) SetOverflow (horizontal, vertical bool) {
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if this.hOverflow == horizontal && this.vOverflow == vertical { return }
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this.hOverflow = horizontal
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this.vOverflow = vertical
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this.invalidateLayout()
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}
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func (this *textBox) ContentBounds () image.Rectangle {
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return this.contentBounds
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}
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func (this *textBox) ScrollTo (point image.Point) {
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if this.scroll == point { return }
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this.scroll = point
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this.invalidateLayout()
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}
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func (this *textBox) OnContentBoundsChange (callback func()) event.Cookie {
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return this.on.contentBoundsChange.Connect(callback)
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}
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func (this *textBox) SetText (text string) {
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if this.text == text { return }
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this.text = text
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this.drawer.SetText([]rune(text))
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this.invalidateMinimum()
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this.invalidateLayout()
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}
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func (this *textBox) SetTextColor (c color.Color) {
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if this.textColor == c { return }
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this.textColor = c
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this.invalidateDraw()
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}
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func (this *textBox) SetFace (face font.Face) {
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if this.face == face { return }
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this.face = face
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this.drawer.SetFace(face)
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this.invalidateMinimum()
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this.invalidateLayout()
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}
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func (this *textBox) SetWrap (wrap bool) {
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if this.wrap == wrap { return }
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this.drawer.SetWrap(wrap)
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this.invalidateMinimum()
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this.invalidateLayout()
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}
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func (this *textBox) SetSelectable (selectable bool) {
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if this.selectable == selectable { return }
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this.selectable = selectable
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}
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func (this *textBox) SetDotColor (c color.Color) {
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if this.dotColor == c { return }
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this.dotColor = c
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if !this.dot.Empty() {
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this.invalidateDraw()
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}
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}
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func (this *textBox) Select (dot text.Dot) {
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if !this.selectable { return }
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if this.dot == dot { return }
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this.SetFocused(true)
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this.dot = dot
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this.scrollToDot()
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this.on.dotChange.Broadcast()
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this.invalidateDraw()
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}
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func (this *textBox) Dot () text.Dot {
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return this.dot
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}
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func (this *textBox) OnDotChange (callback func ()) event.Cookie {
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return this.on.dotChange.Connect(callback)
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}
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func (this *textBox) SetAlign (x, y tomo.Align) {
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if this.hAlign == x && this.vAlign == y { return }
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this.hAlign = x
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this.vAlign = y
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this.drawer.SetAlign(typeset.Align(x), typeset.Align(y))
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this.invalidateDraw()
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}
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func (this *textBox) Draw (can canvas.Canvas) {
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if can == nil { return }
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this.drawBorders(can)
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pen := can.Pen()
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pen.Fill(this.color)
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pen.Texture(this.texture)
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if this.transparent() && this.parent != nil {
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this.parent.drawBackgroundPart(can)
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}
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pen.Rectangle(can.Bounds())
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if this.selectable && this.Focused() {
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this.drawDot(can)
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}
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if this.face == nil { return }
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this.drawer.Draw(can, this.textColor, this.textOffset())
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}
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func roundPt (point fixed.Point26_6) image.Point {
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return image.Pt(point.X.Round(), point.Y.Round())
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}
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func fixPt (point image.Point) fixed.Point26_6 {
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return fixed.P(point.X, point.Y)
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}
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func (this *textBox) drawDot (can canvas.Canvas) {
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if this.face == nil { return }
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pen := can.Pen()
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pen.Fill(color.Transparent)
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pen.Stroke(this.textColor)
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bounds := this.InnerBounds()
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metrics := this.face.Metrics()
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dot := this.dot.Canon()
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start := this.drawer.PositionAt(dot.Start).Add(fixPt(this.textOffset()))
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end := this.drawer.PositionAt(dot.End ).Add(fixPt(this.textOffset()))
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height := this.drawer.LineHeight().Round()
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ascent := fixed.Point26_6 { Y: metrics.Descent }
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descent := fixed.Point26_6 { Y: metrics.Ascent }
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switch {
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case dot.Empty():
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pen.StrokeWeight(1)
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pen.Path(roundPt(start.Add(ascent)), roundPt(start.Sub(descent)))
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case start.Y == end.Y:
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pen.Fill(this.dotColor)
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pen.StrokeWeight(0)
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pen.Rectangle(image.Rectangle {
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Min: roundPt(start.Add(ascent)),
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Max: roundPt(end.Sub(descent)),
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})
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default:
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pen.Fill(this.dotColor)
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pen.StrokeWeight(0)
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rect := image.Rectangle {
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Min: roundPt(start.Add(ascent)),
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Max: roundPt(start.Sub(descent)),
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}
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rect.Max.X = bounds.Max.X
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pen.Rectangle(rect)
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if end.Y - start.Y > fixed.I(height) {
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rect.Min.X = bounds.Min.X
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rect.Min.Y = roundPt(start.Sub(descent)).Y + height
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rect.Max.X = bounds.Max.X
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rect.Max.Y = roundPt(end.Add(ascent)).Y - height
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pen.Rectangle(rect)
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}
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rect = image.Rectangle {
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Min: roundPt(end.Add(ascent)),
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Max: roundPt(end.Sub(descent)),
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}
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rect.Min.X = bounds.Min.X
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pen.Rectangle(rect)
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}
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}
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func (this *textBox) textOffset () image.Point {
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return this.InnerBounds().Min.
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Add(this.scroll).
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Sub(this.drawer.LayoutBoundsSpace().Min)
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}
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func (this *textBox) handleFocusLeave () {
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this.on.dotChange.Broadcast()
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this.invalidateDraw()
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this.box.handleFocusLeave()
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}
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func (this *textBox) handleMouseDown (button input.Button) {
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if button == input.ButtonLeft {
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index := this.runeUnderMouse()
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this.selectStart = index
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this.selecting = true
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this.Select(text.Dot { Start: this.selectStart, End: index })
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}
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this.box.handleMouseDown(button)
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}
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func (this *textBox) handleMouseUp (button input.Button) {
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if button == input.ButtonLeft && this.selecting {
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index := this.runeUnderMouse()
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this.selecting = false
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this.Select(text.Dot { Start: this.selectStart, End: index })
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}
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this.box.handleMouseUp(button)
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}
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func (this *textBox) handleMouseMove () {
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if this.selecting {
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index := this.runeUnderMouse()
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this.Select(text.Dot { Start: this.selectStart, End: index })
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}
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this.box.handleMouseMove()
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}
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func (this *textBox) runeUnderMouse () int {
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position := this.MousePosition().Sub(this.textOffset())
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return this.drawer.AtPosition(fixPt(position))
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}
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func (this *textBox) normalizedLayoutBoundsSpace () image.Rectangle {
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bounds := this.drawer.LayoutBoundsSpace()
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return bounds.Sub(bounds.Min)
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}
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func (this *textBox) contentMinimum () image.Point {
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minimum := this.drawer.MinimumSize()
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if this.hOverflow || this.wrap {
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minimum.X = this.drawer.Em().Round()
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}
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if this.vOverflow {
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minimum.Y = this.drawer.LineHeight().Round()
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}
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return minimum.Add(this.box.contentMinimum())
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}
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func (this *textBox) doLayout () {
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this.box.doLayout()
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previousContentBounds := this.contentBounds
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innerBounds := this.InnerBounds()
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this.drawer.SetWidth(innerBounds.Dx())
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this.drawer.SetHeight(innerBounds.Dy())
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this.contentBounds = this.normalizedLayoutBoundsSpace()
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this.constrainScroll()
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this.contentBounds = this.contentBounds.Add(this.scroll)
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// println(this.InnerBounds().String(), this.contentBounds.String())
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if previousContentBounds != this.contentBounds {
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this.on.contentBoundsChange.Broadcast()
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}
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}
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func (this *textBox) constrainScroll () {
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innerBounds := this.InnerBounds()
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width := this.contentBounds.Dx()
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height := this.contentBounds.Dy()
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// X
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if width <= innerBounds.Dx() {
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this.scroll.X = 0
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} else if this.scroll.X > 0 {
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this.scroll.X = 0
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} else if this.scroll.X < innerBounds.Dx() - width {
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this.scroll.X = innerBounds.Dx() - width
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}
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// Y
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if height <= innerBounds.Dy() {
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this.scroll.Y = 0
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} else if this.scroll.Y > 0 {
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this.scroll.Y = 0
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} else if this.scroll.Y < innerBounds.Dy() - height {
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this.scroll.Y = innerBounds.Dy() - height
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}
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}
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func (this *textBox) scrollToDot () {
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dot := roundPt(this.drawer.PositionAt(this.dot.End)).Add(this.textOffset())
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innerBounds := this.InnerBounds()
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scroll := this.scroll
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em := this.drawer.Em().Round()
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lineHeight := this.drawer.LineHeight().Round()
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// X
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if dot.X < innerBounds.Min.X + em {
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scroll.X += innerBounds.Min.X - dot.X + em
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} else if dot.X > innerBounds.Max.X - em {
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scroll.X -= dot.X - innerBounds.Max.X + em
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}
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// Y
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if dot.Y < innerBounds.Min.Y + lineHeight {
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scroll.Y += innerBounds.Min.Y - dot.Y + lineHeight
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} else if dot.Y > innerBounds.Max.Y - lineHeight {
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scroll.Y -= dot.Y - innerBounds.Max.Y + lineHeight
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}
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this.ScrollTo(scroll)
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}
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