72 lines
1.3 KiB
Go
72 lines
1.3 KiB
Go
package ui
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import (
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"log"
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"time"
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"opslag.de/schobers/geom"
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"opslag.de/schobers/zntg/allg5"
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)
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type State interface {
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Enter(Context) error
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Leave(Context) error
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Update(Context, time.Duration) (State, error)
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Handle(Context, allg5.Event) error
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Render(Context) error
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}
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type StateBase struct {
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Control Control
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ChangeTo State
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}
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func (s *StateBase) Enter(ctx Context) error {
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if nil != s.Control {
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err := s.Control.Created(ctx, nil)
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if nil != err {
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log.Println("error creating control")
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s.Control = nil
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}
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}
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return nil
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}
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func (s *StateBase) Leave(ctx Context) error {
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if nil != s.Control {
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s.Control.Destroyed(ctx)
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}
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return nil
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}
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func (s *StateBase) Update(ctx Context, dt time.Duration) (State, error) {
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if nil != s.Control {
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s.Control.Update(ctx, dt)
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}
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return s.ChangeTo, nil
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}
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func (s *StateBase) Handle(ctx Context, ev allg5.Event) error {
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if nil != s.Control {
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s.Control.Handle(ctx, ev)
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}
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return nil
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}
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func Arrange(ctx Context, c Control, rect geom.RectangleF32) {
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if cont, ok := c.(Container); ok {
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cont.Arrange(ctx, rect)
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} else {
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c.SetRect(rect)
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}
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}
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func (s *StateBase) Render(ctx Context) error {
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if nil != s.Control {
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var disp = ctx.Display()
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Arrange(ctx, s.Control, geom.RectF32(0, 0, float32(disp.Width()), float32(disp.Height())))
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s.Control.Render(ctx)
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}
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return nil
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}
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