bcd03c4c4a
A popover is a special UI element which can be layered over the rest of the UI (i.e. it is painted last) and can fall anywhere on the screen, not just with the bounds of its parent's viewport/context. With these special abilities comes the restriction that only one popover may be visible on screen at once. Popovers are requested from the UI context passed to Draw calls and specify the anchor point and the desired dimensions. The popover is then fit to the available space and placed relative to the anchor point.
122 lines
2.3 KiB
Go
122 lines
2.3 KiB
Go
package ui
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import (
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"sync/atomic"
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"github.com/gdamore/tcell"
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)
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type UI struct {
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Content DrawableInteractive
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exit atomic.Value // bool
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ctx *Context
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screen tcell.Screen
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popover *Popover
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tcEvents chan tcell.Event
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invalid int32 // access via atomic
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}
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func Initialize(content DrawableInteractiveBeeper) (*UI, error) {
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screen, err := tcell.NewScreen()
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if err != nil {
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return nil, err
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}
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if err = screen.Init(); err != nil {
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return nil, err
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}
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screen.Clear()
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screen.HideCursor()
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width, height := screen.Size()
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state := UI{
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Content: content,
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screen: screen,
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tcEvents: make(chan tcell.Event, 10),
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}
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state.ctx = NewContext(width, height, screen, state.onPopover)
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state.exit.Store(false)
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go func() {
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for !state.ShouldExit() {
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state.tcEvents <- screen.PollEvent()
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}
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}()
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state.invalid = 1
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content.OnInvalidate(func(_ Drawable) {
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atomic.StoreInt32(&state.invalid, 1)
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})
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content.OnBeep(screen.Beep)
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content.Focus(true)
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return &state, nil
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}
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func (state *UI) onPopover(p *Popover) {
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state.popover = p
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}
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func (state *UI) ShouldExit() bool {
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return state.exit.Load().(bool)
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}
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func (state *UI) Exit() {
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state.exit.Store(true)
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}
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func (state *UI) Close() {
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state.screen.Fini()
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}
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func (state *UI) Tick() bool {
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more := false
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select {
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case event := <-state.tcEvents:
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switch event := event.(type) {
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case *tcell.EventResize:
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state.screen.Clear()
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width, height := event.Size()
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state.ctx = NewContext(width, height, state.screen, state.onPopover)
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state.Content.Invalidate()
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}
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// if we have a popover, and it can handle the event, it does so
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if state.popover == nil || !state.popover.Event(event) {
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// otherwise, we send the event to the main content
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state.Content.Event(event)
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}
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more = true
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default:
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}
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wasInvalid := atomic.SwapInt32(&state.invalid, 0)
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if wasInvalid != 0 {
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if state.popover != nil {
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// if the previous frame had a popover, rerender the entire display
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state.Content.Invalidate()
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atomic.StoreInt32(&state.invalid, 0)
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}
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// reset popover for the next Draw
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state.popover = nil
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state.Content.Draw(state.ctx)
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if state.popover != nil {
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// if the Draw resulted in a popover, draw it
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state.popover.Draw(state.ctx)
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}
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state.screen.Show()
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more = true
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}
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return more
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}
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func (state *UI) EnableMouse() {
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state.screen.EnableMouse()
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}
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