a15ea01cfb
This commit introduces a new Aerc.Tick function that should be called to refresh the internal state. This in turn makes each AccountView process worker events. The UI goroutine repeatedly refreshes the internal state before drawing a new frame. The reason for this is that many worker messages may need to be processed for a single frame, and drawing the UI is far slower than refreshing the internal state. This has been confirmed in my testing (calling Aerc.Tick only once per frame results in a slower display). Many synchronization code has been removed. We can now write widgets without having to care so much about races. The remaining sync users are: - widgets/spinner: the spinner value is updated from inside an internal goroutine - lib/ui/invalidatable: Invalidate may be called from any goroutine - lib/ui/grid: same - lib/ui/ui: an internal goroutine needs read access to UI.exit - worker/types/worker: Worker.callbacks is used for both worker and UI callbacks The exact goroutine requirements for Drawable have been documented.
43 lines
1.1 KiB
Go
43 lines
1.1 KiB
Go
package ui
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import (
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"github.com/gdamore/tcell"
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)
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// Drawable is a UI component that can draw. Unless specified, all methods must
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// only be called from a single goroutine, the UI goroutine.
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type Drawable interface {
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// Called when this renderable should draw itself.
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Draw(ctx *Context)
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// Specifies a function to call when this cell needs to be redrawn. The
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// callback may be called in any goroutine.
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OnInvalidate(callback func(d Drawable))
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// Invalidates the drawable. This can be called from any goroutine.
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Invalidate()
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}
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type Interactive interface {
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// Returns true if the event was handled by this component
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Event(event tcell.Event) bool
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// Indicates whether or not this control will receive input events
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Focus(focus bool)
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}
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type Simulator interface {
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// Queues up the given input events for simulation
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Simulate(events []tcell.Event)
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}
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type DrawableInteractive interface {
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Drawable
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Interactive
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}
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// A drawable which contains other drawables
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type Container interface {
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Drawable
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// Return all of the drawables which are children of this one (do not
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// recurse into your grandchildren).
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Children() []Drawable
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}
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