1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
package ui
import (
"sync/atomic"
"git.sr.ht/~rjarry/aerc/logging"
"github.com/gdamore/tcell/v2"
)
var MsgChannel = make(chan AercMsg, 50)
// QueueRedraw sends a nil message into the MsgChannel. Nothing will handle this
// message, but a redraw will occur if the UI is marked as invalid
func QueueRedraw() {
MsgChannel <- nil
}
type UI struct {
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 {
return nil, err
}
if err = screen.Init(); err != nil {
return nil, err
}
screen.Clear()
screen.HideCursor()
screen.EnablePaste()
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)
}
content.Focus(true)
if root, ok := content.(RootDrawable); ok {
root.Initialize(&state)
}
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()
}
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
}
return more
}
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)
}
}
}
|
