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package strain_test
import (
"fmt"
"image"
"slices"
"testing"
"testing/synctest"
"github.com/lithdew/casso"
"github.com/stretchr/testify/require"
"golang.org/x/exp/shiny/unit"
"golang.org/x/image/math/fixed"
"github.com/faiface/gui/lay/strain"
"github.com/faiface/gui/style"
)
type solverTest struct {
t *testing.T
*style.Style
*strain.Solver
}
func newSolverTest(t *testing.T, constraints []<-chan strain.Constraint) solverTest {
styl, err := style.New()
if err != nil {
t.Fatal(err)
}
solver, err := strain.NewSolver(styl, constraints)
if err != nil {
t.Fatal(err)
}
return solverTest{t, styl, solver}
}
func (st solverTest) Close() {
if err := st.Style.Close(); err != nil {
st.t.Error(err)
}
}
func (st solverTest) solve(container image.Rectangle, validate func(fields []image.Rectangle) error) {
fields, err := st.Solver.Solve(container)
if err != nil {
st.t.Errorf("Solve(%v): %v", container, err)
}
if err := validate(fields); err != nil {
st.t.Errorf("Solve(%v) = %v; %v", container, fields, err)
}
}
func validateEq(wantFields []image.Rectangle) func(fields []image.Rectangle) error {
return func(fields []image.Rectangle) error {
if !slices.Equal(fields, wantFields) {
return fmt.Errorf("want %v", wantFields)
}
return nil
}
}
// No constraints and zero-sized container.
func TestTrivial(t *testing.T) {
t.Parallel()
st := newSolverTest(t, nil)
defer st.Close()
fields, err := st.Solver.Solve(image.ZR)
if err != nil {
t.Error(err)
}
if len(fields) != 0 {
t.Errorf("expected 0 fields; got %d", len(fields))
}
}
// One field that occupies the whole container.
func TestSingleField(t *testing.T) {
t.Parallel()
// Setup
constraints := make(chan strain.Constraint)
st := newSolverTest(t, []<-chan strain.Constraint{constraints})
defer close(constraints)
defer st.Close()
// Add layout constraints
container := st.Solver.Container()
field := st.Solver.Field(0)
require.NoError(t, st.Solver.AddConstraintPt(casso.EQ, field.Origin, container.Origin))
require.NoError(t, st.Solver.AddConstraintPt(casso.EQ, field.Size, container.Size))
// Solve
for _, container := range []image.Rectangle{
image.ZR,
image.Rectangle{image.ZP, image.Pt(800, 600)},
image.Rectangle{image.Pt(12, 34), image.Pt(123, 456)},
} {
// field == container
st.solve(container, validateEq([]image.Rectangle{container}))
}
}
// Field gives its minimum size.
func TestFieldMinSize(t *testing.T) {
t.Parallel()
synctest.Test(t, func(t *testing.T) {
// Setup
constraints := make(chan strain.Constraint)
st := newSolverTest(t, []<-chan strain.Constraint{constraints})
defer close(constraints)
defer st.Close()
// Add field constraints
minWidth := unit.Value{32, unit.Ch}
minHeight := unit.Value{1.5, unit.Em}
constraints <- strain.Constraint{strain.Width, casso.GTE, minWidth}
constraints <- strain.Constraint{strain.Height, casso.GTE, minHeight}
synctest.Wait()
// Solve
st.solve(image.Rect(12, 34, 800, 600), func(fields []image.Rectangle) error {
if len(fields) != 1 {
return fmt.Errorf("got %d fields; want %d", len(fields), 1)
}
field := fields[0]
if fixed.I(field.Dx()) < st.Style.Pixels(minWidth) {
return fmt.Errorf("dx = %v; want >= %v", field.Dx(), st.Style.Pixels(minWidth))
} else if fixed.I(field.Dy()) < st.Style.Pixels(minHeight) {
return fmt.Errorf("dy = %v; want >= %v", field.Dy(), st.Style.Pixels(minHeight))
}
return nil
})
})
}
// Field min size larger than container.
func TestFieldMinSizeLargerThanContainer(t *testing.T) {
t.Parallel()
synctest.Test(t, func(t *testing.T) {
// Setup
constraints := make(chan strain.Constraint)
st := newSolverTest(t, []<-chan strain.Constraint{constraints})
defer close(constraints)
defer st.Close()
// Add field constraints
constraints <- strain.Constraint{strain.Width, casso.GTE, unit.Value{200, unit.Px}}
constraints <- strain.Constraint{strain.Height, casso.GTE, unit.Value{300, unit.Px}}
// Solve
container := image.Rect(12, 34, 100, 200)
synctest.Wait()
st.solve(container, validateEq([]image.Rectangle{container}))
})
}
// Fields arranged as rows.
func TestRows(t *testing.T) {
t.Parallel()
synctest.Test(t, func(t *testing.T) {
// Setup
nrows := 8
constraintss := make([]chan strain.Constraint, nrows)
for i := range constraintss {
constraintss[i] = make(chan strain.Constraint)
}
st := newSolverTest(t, castRx(constraintss))
defer func() {
for _, c := range constraintss {
close(c)
}
st.Close()
}()
// Add layout constraints
require.NoError(t, st.Solver.AddConstraintPt(casso.EQ, st.Solver.Field(0).Origin, st.Solver.Container().Origin)) // start from top left corner
fieldHeights := make([]casso.Term, nrows)
for i := 0; i < nrows; i++ {
fieldHeights[i] = st.Field(i).Size.Y.T(1)
container := st.Solver.Container()
f := st.Solver.Field(i)
require.NoError(t, st.Solver.AddConstraint(casso.EQ, 0, f.Size.X.T(1), container.Size.X.T(-1))) // span full width
}
terms := append(fieldHeights, st.Solver.Container().Size.Y.T(-1)) // ∑field[i].height <= container.height
require.NoError(t, st.Solver.AddConstraint(casso.LTE, 0, terms...))
for i := 1; i < nrows; i++ {
f0, f1 := st.Solver.Field(i-1), st.Solver.Field(i)
require.NoError(t, st.Solver.AddConstraint(casso.EQ, 0, f1.Origin.Y.T(1), f0.Origin.Y.T(-1), f0.Size.Y.T(-1))) // in order
require.NoError(t, st.Solver.AddConstraintPt(casso.EQ, f1.Size, f0.Size)) // same size
}
// Add field constraints
var rowHeight int
for i, c := range constraintss {
rowHeight = 2 * i
c <- strain.Constraint{strain.Width, casso.GTE, unit.Value{float64(16 + i), unit.Ch}}
c <- strain.Constraint{strain.Height, casso.GTE, unit.Value{float64(rowHeight), unit.Px}}
}
// Solve
container := image.Rect(123, 234, 567, 678)
synctest.Wait()
fields, err := st.Solver.Solve(container)
if err != nil {
t.Fatal(err)
}
require.EqualValues(t, nrows, len(fields), "wrong number of fields")
for _, field := range fields {
t.Logf("%v (%d %d)\n", field, field.Dx(), field.Dy())
}
for i, field := range fields {
require.Equal(t, container.Min.X, field.Min.X, "not left-aligned with container")
require.Equal(t, container.Min.Y+i*rowHeight, field.Min.Y, "wrong y position")
require.Equal(t, container.Dx(), field.Dx(), "wrong width")
require.Equal(t, rowHeight, field.Dy(), "wrong height")
}
})
}
func TestSolver(t *testing.T) {
t.Fail() // TODO: more tests
}
func castRx[T any](cs []chan T) []<-chan T {
rcs := make([]<-chan T, len(cs))
for i, c := range cs {
rcs[i] = c
}
return rcs
}
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