Greg Pomerantz
6720359360
- Element interface with Region() and Visible() methods - Label and ListView element types with constructors - Renderer that clips and draws elements in slice order - Main app loop with Gioui window and frame events Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>
71 lines
1.5 KiB
Go
71 lines
1.5 KiB
Go
package ui
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import (
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"image"
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"gioui.org/layout"
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"gioui.org/op/clip"
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"gioui.org/text"
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"gioui.org/widget/material"
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)
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// Renderer consumes a slice of elements and draws them.
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type Renderer struct {
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theme Theme
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shp *text.Shaper
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}
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// New creates a new Renderer.
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func New(th Theme, shp *text.Shaper) *Renderer {
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return &Renderer{theme: th, shp: shp}
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}
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// Draw iterates elements and draws each in slice order (back-to-front).
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func (r *Renderer) Draw(gtx layout.Context, elems []Element) {
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for _, e := range elems {
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if !e.Visible() {
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continue
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}
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switch v := e.(type) {
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case Label:
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r.drawLabel(gtx, v)
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case ListView:
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r.drawListView(gtx, v)
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default:
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// unknown element type, skip
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}
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}
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}
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func (r *Renderer) drawLabel(gtx layout.Context, l Label) {
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reg := l.Region()
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c := clip.Rect{
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Min: image.Point{X: int(reg.X), Y: int(reg.Y)},
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Max: image.Point{X: int(reg.X + reg.W), Y: int(reg.Y + reg.H)},
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}.Push(gtx.Ops)
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th := material.NewTheme()
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th.Shaper = r.shp
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size := l.FontSize
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if size == 0 {
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size = r.theme.FontSize
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}
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material.Label(th, size, l.Text).Layout(gtx)
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c.Pop()
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}
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func (r *Renderer) drawListView(gtx layout.Context, lv ListView) {
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reg := lv.Region()
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c := clip.Rect{
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Min: image.Point{X: int(reg.X), Y: int(reg.Y)},
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Max: image.Point{X: int(reg.X + reg.W), Y: int(reg.Y + reg.H)},
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}.Push(gtx.Ops)
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th := material.NewTheme()
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th.Shaper = r.shp
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for _, item := range lv.Items {
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material.Label(th, r.theme.FontSize, item.Text).Layout(gtx)
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}
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c.Pop()
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}
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