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LinearLayout serves as a wrapper for several gio layout structs and it reduces the amount of code required when applying basic attributes like padding, margin, border, etc to a layout.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| package decredmaterial | ||
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| import ( | ||
| "image/color" | ||
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| "gioui.org/f32" | ||
| "gioui.org/layout" | ||
| "gioui.org/op/clip" | ||
| "gioui.org/op/paint" | ||
| "gioui.org/unit" | ||
| ) | ||
|
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| // Border lays out a widget and draws a border inside it. | ||
| type Border struct { | ||
| Color color.NRGBA | ||
| Radius CornerRadius | ||
| Width unit.Value | ||
| } | ||
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| func (b Border) Layout(gtx layout.Context, w layout.Widget) layout.Dimensions { | ||
| dims := w(gtx) | ||
| sz := layout.FPt(dims.Size) | ||
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| width := float32(gtx.Px(b.Width)) | ||
| sz.X -= width | ||
| sz.Y -= width | ||
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| r := f32.Rectangle{Max: sz} | ||
| r = r.Add(f32.Point{X: width * 0.5, Y: width * 0.5}) | ||
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| tr := float32(gtx.Px(unit.Dp(b.Radius.TopRight))) | ||
| tl := float32(gtx.Px(unit.Dp(b.Radius.TopLeft))) | ||
| br := float32(gtx.Px(unit.Dp(b.Radius.BottomRight))) | ||
| bl := float32(gtx.Px(unit.Dp(b.Radius.BottomLeft))) | ||
| radius := clip.RRect{ | ||
| Rect: r, | ||
| NW: tl, NE: tr, SE: br, SW: bl, | ||
| } | ||
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| paint.FillShape(gtx.Ops, | ||
| b.Color, | ||
| clip.Stroke{ | ||
| Path: radius.Path(gtx.Ops), | ||
| Style: clip.StrokeStyle{Width: width}, | ||
| }.Op(), | ||
| ) | ||
|
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| return dims | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| package decredmaterial | ||
|
|
||
| import ( | ||
| "image/color" | ||
|
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| "gioui.org/f32" | ||
| "gioui.org/layout" | ||
| "gioui.org/op/clip" | ||
| "gioui.org/unit" | ||
| ) | ||
|
|
||
| const ( | ||
| WRAP_CONTENT = -1 | ||
| MATCH_PARENT = -2 | ||
| ) | ||
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| type LinearLayout struct { | ||
| Width int | ||
| Height int | ||
| Orientation layout.Axis | ||
| Background color.NRGBA | ||
| Border Border | ||
| Margin layout.Inset | ||
| Padding layout.Inset | ||
| Direction layout.Direction | ||
| } | ||
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| func (ll LinearLayout) Layout(gtx C, children ...layout.FlexChild) D { | ||
| // draw margin | ||
| return ll.Margin.Layout(gtx, func(gtx C) D { | ||
| return layout.Stack{}.Layout(gtx, | ||
| layout.Expanded(func(gtx C) D { | ||
| ll.applyDimension(>x) | ||
| // // draw background and and clip the background to border radius | ||
| tr := float32(gtx.Px(unit.Dp(ll.Border.Radius.TopRight))) | ||
| tl := float32(gtx.Px(unit.Dp(ll.Border.Radius.TopLeft))) | ||
| br := float32(gtx.Px(unit.Dp(ll.Border.Radius.BottomRight))) | ||
| bl := float32(gtx.Px(unit.Dp(ll.Border.Radius.BottomLeft))) | ||
| clip.RRect{ | ||
| Rect: f32.Rectangle{Max: f32.Point{ | ||
| X: float32(gtx.Constraints.Min.X), | ||
| Y: float32(gtx.Constraints.Min.Y), | ||
| }}, | ||
| NW: tl, NE: tr, SE: br, SW: bl, | ||
| }.Add(gtx.Ops) | ||
| return fill(gtx, ll.Background) | ||
| }), | ||
| layout.Stacked(func(gtx C) D { | ||
| ll.applyDimension(>x) | ||
| return ll.Border.Layout(gtx, func(gtx C) D { | ||
| // draw padding | ||
| return ll.Padding.Layout(gtx, func(gtx C) D { | ||
| // draw layout direction | ||
| return ll.Direction.Layout(gtx, func(gtx C) D { | ||
| return layout.Flex{Axis: ll.Orientation}.Layout(gtx, children...) | ||
| }) | ||
| }) | ||
| }) | ||
| }), | ||
| ) | ||
| }) | ||
| } | ||
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| func (ll LinearLayout) applyDimension(gtx *C) { | ||
| if ll.Width == MATCH_PARENT { | ||
| gtx.Constraints.Min.X = gtx.Constraints.Max.X | ||
| } else if ll.Width != WRAP_CONTENT { | ||
| gtx.Constraints.Min.X = ll.Width | ||
| gtx.Constraints.Max.X = ll.Width | ||
| } | ||
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| if ll.Height == MATCH_PARENT { | ||
| gtx.Constraints.Min.Y = gtx.Constraints.Max.Y | ||
| } else if ll.Height != WRAP_CONTENT { | ||
| gtx.Constraints.Min.Y = ll.Height | ||
| gtx.Constraints.Max.Y = ll.Height | ||
| } | ||
| } |
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