83 lines
1.5 KiB
Go
83 lines
1.5 KiB
Go
package gel
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import (
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"image"
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"gioui.org/gesture"
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l "gioui.org/layout"
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"gioui.org/op/clip"
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)
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type Enum struct {
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value string
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changed bool
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clicks []gesture.Click
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values []string
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hook func(value string)
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}
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func (w *Window) Enum() *Enum {
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return &Enum{hook: func(string) {}}
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}
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func (e *Enum) Value() string {
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return e.value
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}
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func (e *Enum) SetValue(value string) *Enum {
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e.value = value
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return e
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}
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func (e *Enum) SetOnChange(hook func(value string)) *Enum {
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e.hook = hook
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return e
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}
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func index(vs []string, t string) int {
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for i, v := range vs {
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if v == t {
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return i
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}
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}
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return -1
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}
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// Changed reports whether Value has changed by user interaction since the last call to Changed.
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func (e *Enum) Changed() bool {
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changed := e.changed
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e.changed = false
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return changed
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}
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// Fn adds the event handler for key.
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func (e *Enum) Fn(gtx l.Context, key string) l.Dimensions {
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defer clip.Rect(image.Rectangle{Max: gtx.Constraints.Min}).Push(gtx.Ops).Pop()
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if index(e.values, key) == -1 {
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e.values = append(e.values, key)
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e.clicks = append(e.clicks, gesture.Click{})
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e.clicks[len(e.clicks)-1].Add(gtx.Ops)
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} else {
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idx := index(e.values, key)
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clk := &e.clicks[idx]
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for {
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ev, ok := clk.Update(gtx.Source)
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if !ok {
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break
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}
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switch ev.Kind {
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case gesture.KindClick:
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if niew := e.values[idx]; niew != e.value {
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e.value = niew
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e.changed = true
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e.hook(e.value)
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}
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}
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}
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clk.Add(gtx.Ops)
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}
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return l.Dimensions{Size: gtx.Constraints.Min}
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}
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