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package strain_test
import (
"fmt"
"image"
"slices"
"testing"
"testing/synctest"
"github.com/lithdew/casso"
"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) addConstraint(op casso.Op, lhs, rhs casso.Symbol) {
if err := st.Solver.AddConstraint(op, lhs, rhs); 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 st.Close()
defer close(constraints)
// Add layout constraints
container := st.Solver.Container()
field := st.Solver.Field(0)
st.addConstraint(casso.EQ, field.Origin.X, container.Origin.X)
st.addConstraint(casso.EQ, field.Origin.Y, container.Origin.Y)
st.addConstraint(casso.EQ, field.Size.X, container.Size.X)
st.addConstraint(casso.EQ, field.Size.Y, container.Size.Y)
// 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}))
}
}
// Widget 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 st.Close()
defer close(constraints)
// Add widget 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
})
})
}
// Solver with only layout constaints, no field constraints.
func TestLayConstrs(t *testing.T) {
t.Parallel()
st := newSolverTest(t, nil)
defer st.Close()
t.Fail() // TODO: more tests
}
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