aerc/lib/ui/ui.go

120 lines
2.4 KiB
Go
Raw Normal View History

2018-01-11 04:03:56 +01:00
package ui
import (
"sync/atomic"
"git.sr.ht/~rjarry/aerc/logging"
"github.com/gdamore/tcell/v2"
2018-01-11 04:03:56 +01:00
)
type UI struct {
2018-02-28 03:17:26 +01:00
Content DrawableInteractive
exit atomic.Value // bool
ctx *Context
screen tcell.Screen
popover *Popover
invalid int32 // access via atomic
}
func Initialize(content DrawableInteractive) (*UI, error) {
screen, err := tcell.NewScreen()
if err != nil {
2018-01-11 04:03:56 +01:00
return nil, err
}
if err = screen.Init(); err != nil {
return nil, err
}
screen.Clear()
screen.HideCursor()
width, height := screen.Size()
state := UI{
Content: content,
screen: screen,
}
state.ctx = NewContext(width, height, screen, state.onPopover)
state.exit.Store(false)
state.invalid = 1
content.OnInvalidate(func(_ Drawable) {
atomic.StoreInt32(&state.invalid, 1)
})
if beeper, ok := content.(DrawableInteractiveBeeper); ok {
beeper.OnBeep(screen.Beep)
}
2019-03-17 19:02:33 +01:00
content.Focus(true)
if root, ok := content.(RootDrawable); ok {
root.Initialize(&state)
}
2018-01-11 04:03:56 +01:00
return &state, nil
}
func (state *UI) onPopover(p *Popover) {
state.popover = p
}
func (state *UI) ShouldExit() bool {
return state.exit.Load().(bool)
}
func (state *UI) Exit() {
state.exit.Store(true)
}
func (state *UI) Close() {
state.screen.Fini()
2018-01-11 04:03:56 +01:00
}
func (state *UI) Render() bool {
more := false
wasInvalid := atomic.SwapInt32(&state.invalid, 0)
if wasInvalid != 0 {
if state.popover != nil {
// if the previous frame had a popover, rerender the entire display
state.Content.Invalidate()
atomic.StoreInt32(&state.invalid, 0)
}
// reset popover for the next Draw
state.popover = nil
state.Content.Draw(state.ctx)
if state.popover != nil {
// if the Draw resulted in a popover, draw it
state.popover.Draw(state.ctx)
}
state.screen.Show()
more = true
2018-01-11 04:03:56 +01:00
}
return more
2018-01-11 04:03:56 +01:00
}
func (state *UI) EnableMouse() {
state.screen.EnableMouse()
}
func (state *UI) ProcessEvents() {
defer logging.PanicHandler()
for !state.ShouldExit() {
event := state.screen.PollEvent()
if event, ok := event.(*tcell.EventResize); ok {
state.screen.Clear()
width, height := event.Size()
state.ctx = NewContext(width, height, state.screen, state.onPopover)
state.Content.Invalidate()
}
// if we have a popover, and it can handle the event, it does so
if state.popover == nil || !state.popover.Event(event) {
// otherwise, we send the event to the main content
state.Content.Event(event)
}
}
}