mirror of
https://git.sr.ht/~eliasnaur/gio
synced 2026-07-01 15:45:38 +00:00
Elias Naur
f44ccec043
Get rid of the confused LayerOp and the transparent property from AreaOp. Add an explicit PassOp to specify whether pointer events pass-through the current area. Let AreaOp swallow events even when no handlers are active for the area. That behaviour is less surprising and allow clients to disable a widget by keeping its areas but leave out its handlers. Simplify the pointer.HitResult enum to just a bool: hit or no hit. Finally, simplify the pointer queue by tracking parent areas and node with indices.
105 lines
2.2 KiB
Go
105 lines
2.2 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
|
|
|
|
package ui
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"math"
|
|
"time"
|
|
|
|
"gioui.org/ui/f32"
|
|
"gioui.org/ui/internal/ops"
|
|
)
|
|
|
|
// Config represents the essential configuration for
|
|
// updating and drawing a user interface.
|
|
type Config interface {
|
|
// Now returns the current animation time.
|
|
Now() time.Time
|
|
// Px converts a Value to pixels.
|
|
Px(v Value) int
|
|
}
|
|
|
|
// InvalidateOp requests a redraw at the given time. Use
|
|
// the zero value to request an immediate redraw.
|
|
type InvalidateOp struct {
|
|
At time.Time
|
|
}
|
|
|
|
// TransformOp applies a transform to later ops.
|
|
type TransformOp struct {
|
|
Transform Transform
|
|
}
|
|
|
|
type Transform struct {
|
|
// TODO: general transforms.
|
|
offset f32.Point
|
|
}
|
|
|
|
// Inf is the int value that represents an unbounded maximum constraint.
|
|
const Inf = int(^uint(0) >> 1)
|
|
|
|
func (r InvalidateOp) Add(o *Ops) {
|
|
data := make([]byte, ops.TypeRedrawLen)
|
|
data[0] = byte(ops.TypeInvalidate)
|
|
bo := binary.LittleEndian
|
|
// UnixNano cannot represent the zero time.
|
|
if t := r.At; !t.IsZero() {
|
|
nanos := t.UnixNano()
|
|
if nanos > 0 {
|
|
bo.PutUint64(data[1:], uint64(nanos))
|
|
}
|
|
}
|
|
o.Write(data)
|
|
}
|
|
|
|
func (r *InvalidateOp) Decode(d []byte) {
|
|
bo := binary.LittleEndian
|
|
if ops.OpType(d[0]) != ops.TypeInvalidate {
|
|
panic("invalid op")
|
|
}
|
|
if nanos := bo.Uint64(d[1:]); nanos > 0 {
|
|
r.At = time.Unix(0, int64(nanos))
|
|
}
|
|
}
|
|
|
|
func (t Transform) InvTransform(p f32.Point) f32.Point {
|
|
return p.Sub(t.offset)
|
|
}
|
|
|
|
func (t Transform) Transform(p f32.Point) f32.Point {
|
|
return p.Add(t.offset)
|
|
}
|
|
|
|
func (t Transform) Mul(t2 Transform) Transform {
|
|
return Transform{
|
|
offset: t.offset.Add(t2.offset),
|
|
}
|
|
}
|
|
|
|
func (t TransformOp) Add(o *Ops) {
|
|
data := make([]byte, ops.TypeTransformLen)
|
|
data[0] = byte(ops.TypeTransform)
|
|
bo := binary.LittleEndian
|
|
bo.PutUint32(data[1:], math.Float32bits(t.Transform.offset.X))
|
|
bo.PutUint32(data[5:], math.Float32bits(t.Transform.offset.Y))
|
|
o.Write(data)
|
|
}
|
|
|
|
func (t *TransformOp) Decode(d []byte) {
|
|
bo := binary.LittleEndian
|
|
if ops.OpType(d[0]) != ops.TypeTransform {
|
|
panic("invalid op")
|
|
}
|
|
*t = TransformOp{
|
|
Transform: Offset(f32.Point{
|
|
X: math.Float32frombits(bo.Uint32(d[1:])),
|
|
Y: math.Float32frombits(bo.Uint32(d[5:])),
|
|
}),
|
|
}
|
|
}
|
|
|
|
func Offset(o f32.Point) Transform {
|
|
return Transform{o}
|
|
}
|