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-rw-r--r--lib/ui/grid.go21
1 files changed, 20 insertions, 1 deletions
diff --git a/lib/ui/grid.go b/lib/ui/grid.go
index 3fc7f04..f36a16a 100644
--- a/lib/ui/grid.go
+++ b/lib/ui/grid.go
@@ -3,6 +3,7 @@ package ui
import (
"fmt"
"math"
+ "sync"
"sync/atomic"
)
@@ -12,8 +13,11 @@ type Grid struct {
rowLayout []gridLayout
columns []GridSpec
columnLayout []gridLayout
- cells []*GridCell
invalid bool
+
+ // Protected by mutex
+ cells []*GridCell
+ mutex sync.RWMutex
}
const (
@@ -73,6 +77,9 @@ func (grid *Grid) Columns(spec []GridSpec) *Grid {
}
func (grid *Grid) Children() []Drawable {
+ grid.mutex.RLock()
+ defer grid.mutex.RUnlock()
+
children := make([]Drawable, len(grid.cells))
for i, cell := range grid.cells {
children[i] = cell.Content
@@ -85,6 +92,10 @@ func (grid *Grid) Draw(ctx *Context) {
if invalid {
grid.reflow(ctx)
}
+
+ grid.mutex.RLock()
+ defer grid.mutex.RUnlock()
+
for _, cell := range grid.cells {
cellInvalid := cell.invalid.Load().(bool)
if !cellInvalid && !invalid {
@@ -148,9 +159,11 @@ func (grid *Grid) invalidateLayout() {
func (grid *Grid) Invalidate() {
grid.invalidateLayout()
+ grid.mutex.RLock()
for _, cell := range grid.cells {
cell.Content.Invalidate()
}
+ grid.mutex.RUnlock()
}
func (grid *Grid) AddChild(content Drawable) *GridCell {
@@ -159,7 +172,9 @@ func (grid *Grid) AddChild(content Drawable) *GridCell {
ColSpan: 1,
Content: content,
}
+ grid.mutex.Lock()
grid.cells = append(grid.cells, cell)
+ grid.mutex.Unlock()
cell.Content.OnInvalidate(grid.cellInvalidated)
cell.invalid.Store(true)
grid.invalidateLayout()
@@ -167,23 +182,27 @@ func (grid *Grid) AddChild(content Drawable) *GridCell {
}
func (grid *Grid) RemoveChild(cell *GridCell) {
+ grid.mutex.Lock()
for i, _cell := range grid.cells {
if _cell == cell {
grid.cells = append(grid.cells[:i], grid.cells[i+1:]...)
break
}
}
+ grid.mutex.Unlock()
grid.invalidateLayout()
}
func (grid *Grid) cellInvalidated(drawable Drawable) {
var cell *GridCell
+ grid.mutex.RLock()
for _, cell = range grid.cells {
if cell.Content == drawable {
break
}
cell = nil
}
+ grid.mutex.RUnlock()
if cell == nil {
panic(fmt.Errorf("Attempted to invalidate unknown cell"))
}