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authorDrew DeVault <sir@cmpwn.com>2018-02-17 20:11:58 -0500
committerDrew DeVault <sir@cmpwn.com>2018-02-17 20:11:58 -0500
commitf0791d4ba720c4cfa1d3f90c99296584aa878cd9 (patch)
treeab701590b7d551fad729590b820c40c9b88eb136 /ui/grid.go
parent7f67162f43374188f619e571c6d614626a24127a (diff)
Add borders widget
Diffstat (limited to 'ui/grid.go')
-rw-r--r--ui/grid.go56
1 files changed, 33 insertions, 23 deletions
diff --git a/ui/grid.go b/ui/grid.go
index 2091fc5..ede7d0c 100644
--- a/ui/grid.go
+++ b/ui/grid.go
@@ -6,10 +6,10 @@ import (
)
type Grid struct {
- Rows []DimSpec
- rowLayout []dimLayout
- Columns []DimSpec
- columnLayout []dimLayout
+ rows []GridSpec
+ rowLayout []gridLayout
+ columns []GridSpec
+ columnLayout []gridLayout
Cells []*GridCell
onInvalidate func(d Drawable)
invalid bool
@@ -21,17 +21,17 @@ const (
)
// Specifies the layout of a single row or column
-type DimSpec struct {
+type GridSpec struct {
// One of SIZE_EXACT or SIZE_WEIGHT
Strategy int
- // If Strategy = SIZE_EXACT, this is the number of cells this dim shall
- // occupy. If SIZE_WEIGHT, the space left after all exact dims are measured
- // is distributed amonst the remaining dims weighted by this value.
+ // If Strategy = SIZE_EXACT, this is the number of cells this row/col shall
+ // occupy. If SIZE_WEIGHT, the space left after all exact rows/cols are
+ // measured is distributed amonst the remainder weighted by this value.
Size int
}
// Used to cache layout of each row/column
-type dimLayout struct {
+type gridLayout struct {
Offset int
Size int
}
@@ -61,6 +61,16 @@ func (cell *GridCell) Span(rows, cols int) *GridCell {
return cell
}
+func (grid *Grid) Rows(spec []GridSpec) *Grid {
+ grid.rows = spec
+ return grid
+}
+
+func (grid *Grid) Columns(spec []GridSpec) *Grid {
+ grid.columns = spec
+ return grid
+}
+
func (grid *Grid) Draw(ctx *Context) {
invalid := grid.invalid
if invalid {
@@ -90,25 +100,25 @@ func (grid *Grid) Draw(ctx *Context) {
func (grid *Grid) reflow(ctx *Context) {
grid.rowLayout = nil
grid.columnLayout = nil
- flow := func(specs *[]DimSpec, layouts *[]dimLayout, extent int) {
+ flow := func(specs *[]GridSpec, layouts *[]gridLayout, extent int) {
exact := 0
weight := 0
nweights := 0
- for _, dim := range *specs {
- if dim.Strategy == SIZE_EXACT {
- exact += dim.Size
- } else if dim.Strategy == SIZE_WEIGHT {
+ for _, spec := range *specs {
+ if spec.Strategy == SIZE_EXACT {
+ exact += spec.Size
+ } else if spec.Strategy == SIZE_WEIGHT {
nweights += 1
- weight += dim.Size
+ weight += spec.Size
}
}
offset := 0
- for _, dim := range *specs {
- layout := dimLayout{Offset: offset}
- if dim.Strategy == SIZE_EXACT {
- layout.Size = dim.Size
- } else if dim.Strategy == SIZE_WEIGHT {
- size := float64(dim.Size) / float64(weight)
+ for _, spec := range *specs {
+ layout := gridLayout{Offset: offset}
+ if spec.Strategy == SIZE_EXACT {
+ layout.Size = spec.Size
+ } else if spec.Strategy == SIZE_WEIGHT {
+ size := float64(spec.Size) / float64(weight)
size *= float64(extent - exact)
layout.Size = int(math.Floor(size))
}
@@ -116,8 +126,8 @@ func (grid *Grid) reflow(ctx *Context) {
*layouts = append(*layouts, layout)
}
}
- flow(&grid.Rows, &grid.rowLayout, ctx.Height())
- flow(&grid.Columns, &grid.columnLayout, ctx.Width())
+ flow(&grid.rows, &grid.rowLayout, ctx.Height())
+ flow(&grid.columns, &grid.columnLayout, ctx.Width())
grid.invalid = false
}