forked from joejulian/gio
Thomas Bruyelle
ae8a377cda
The funcs replace stack.Push and macro.Record, which become private. This makes stack and macro faster to write, in particular for stacks where you can just write the following line to save and restore the state : defer op.Push(ops).Pop() This usage requires Push to return a pointer (since Pop has a pointer receiver), or else the code doesn't compile. For consistancy, I tried to do the same for op.Record, but this implied to turn all the MacroOp fields into pointers, and this caused some panics. As a result, op.Record doesn't return a pointer. An other side effect pointed by Larry Clapp: StackOp and MacroOp are not re-usable any more, you have to allocate a new one for each usage, using the described funcs above. Signed-off-by: Thomas Bruyelle <thomas.bruyelle@gmail.com>
62 lines
1.1 KiB
Go
62 lines
1.1 KiB
Go
package widget
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import (
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"image"
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"gioui.org/gesture"
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"gioui.org/io/pointer"
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"gioui.org/layout"
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"gioui.org/op"
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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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}
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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 interactino since the last
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// 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 = true
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return changed
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}
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// Layout adds the event handler for key.
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func (e *Enum) Layout(gtx layout.Context, key string) layout.Dimensions {
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defer op.Push(gtx.Ops).Pop()
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pointer.Rect(image.Rectangle{Max: gtx.Constraints.Min}).Add(gtx.Ops)
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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 _, ev := range clk.Events(gtx) {
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switch ev.Type {
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case gesture.TypeClick:
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e.Value = e.values[idx]
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e.changed = true
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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 layout.Dimensions{Size: gtx.Constraints.Min}
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}
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