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authorDrew DeVault <sir@cmpwn.com>2018-02-27 19:30:59 -0500
committerDrew DeVault <sir@cmpwn.com>2018-02-27 19:31:09 -0500
commit46756487fb56acf26122a7b5d46be2ff8ee3c051 (patch)
tree3be5178f68abd94f4fc1e47904eef24caef78b7a /lib
parent384fe0d82691d55615655fc17a350f710dd4cf1c (diff)
Add stack UI container
Diffstat (limited to 'lib')
-rw-r--r--lib/ui/grid.go14
-rw-r--r--lib/ui/stack.go73
2 files changed, 80 insertions, 7 deletions
diff --git a/lib/ui/grid.go b/lib/ui/grid.go
index ede7d0c..3c375ee 100644
--- a/lib/ui/grid.go
+++ b/lib/ui/grid.go
@@ -10,7 +10,7 @@ type Grid struct {
rowLayout []gridLayout
columns []GridSpec
columnLayout []gridLayout
- Cells []*GridCell
+ cells []*GridCell
onInvalidate func(d Drawable)
invalid bool
}
@@ -76,7 +76,7 @@ func (grid *Grid) Draw(ctx *Context) {
if invalid {
grid.reflow(ctx)
}
- for _, cell := range grid.Cells {
+ for _, cell := range grid.cells {
if !cell.invalid && !invalid {
continue
}
@@ -140,7 +140,7 @@ func (grid *Grid) invalidateLayout() {
func (grid *Grid) Invalidate() {
grid.invalidateLayout()
- for _, cell := range grid.Cells {
+ for _, cell := range grid.cells {
cell.Content.Invalidate()
}
}
@@ -156,7 +156,7 @@ func (grid *Grid) AddChild(content Drawable) *GridCell {
Content: content,
invalid: true,
}
- grid.Cells = append(grid.Cells, cell)
+ grid.cells = append(grid.cells, cell)
cell.Content.OnInvalidate(grid.cellInvalidated)
cell.invalid = true
grid.invalidateLayout()
@@ -164,9 +164,9 @@ func (grid *Grid) AddChild(content Drawable) *GridCell {
}
func (grid *Grid) RemoveChild(cell *GridCell) {
- for i, _cell := range grid.Cells {
+ for i, _cell := range grid.cells {
if _cell == cell {
- grid.Cells = append(grid.Cells[:i], grid.Cells[i+1:]...)
+ grid.cells = append(grid.cells[:i], grid.cells[i+1:]...)
break
}
}
@@ -175,7 +175,7 @@ func (grid *Grid) RemoveChild(cell *GridCell) {
func (grid *Grid) cellInvalidated(drawable Drawable) {
var cell *GridCell
- for _, cell = range grid.Cells {
+ for _, cell = range grid.cells {
if cell.Content == drawable {
break
}
diff --git a/lib/ui/stack.go b/lib/ui/stack.go
new file mode 100644
index 0000000..9f81db8
--- /dev/null
+++ b/lib/ui/stack.go
@@ -0,0 +1,73 @@
+package ui
+
+import (
+ "fmt"
+
+ tb "github.com/nsf/termbox-go"
+)
+
+type Stack struct {
+ children []Drawable
+ onInvalidate func(d Drawable)
+}
+
+func NewStack() *Stack {
+ return &Stack{}
+}
+
+func (stack *Stack) OnInvalidate(onInvalidate func (d Drawable)) {
+ stack.onInvalidate = onInvalidate
+}
+
+func (stack *Stack) Invalidate() {
+ if stack.onInvalidate != nil {
+ stack.onInvalidate(stack)
+ }
+}
+
+func (stack *Stack) Draw(ctx *Context) {
+ if len(stack.children) > 0 {
+ stack.Peek().Draw(ctx)
+ } else {
+ cell := tb.Cell{
+ Fg: tb.ColorDefault,
+ Bg: tb.ColorDefault,
+ Ch: ' ',
+ }
+ ctx.Fill(0, 0, ctx.Width(), ctx.Height(), cell)
+ }
+}
+
+func (stack *Stack) Push(d Drawable) {
+ if len(stack.children) != 0 {
+ stack.Peek().OnInvalidate(nil)
+ }
+ stack.children = append(stack.children, d)
+ d.OnInvalidate(stack.invalidateFromChild)
+ stack.Invalidate()
+}
+
+func (stack *Stack) Pop() Drawable {
+ if len(stack.children) == 0 {
+ panic(fmt.Errorf("Tried to pop from an empty UI stack"))
+ }
+ d := stack.children[len(stack.children)-1]
+ stack.children = stack.children[:len(stack.children)-1]
+ stack.Invalidate()
+ d.OnInvalidate(nil)
+ if len(stack.children) != 0 {
+ stack.Peek().OnInvalidate(stack.invalidateFromChild)
+ }
+ return d
+}
+
+func (stack *Stack) Peek() Drawable {
+ if len(stack.children) == 0 {
+ panic(fmt.Errorf("Tried to peek from an empty stack"))
+ }
+ return stack.children[len(stack.children)-1]
+}
+
+func (stack *Stack) invalidateFromChild(d Drawable) {
+ stack.Invalidate()
+}