Function test_function_changed

vispy/visuals/shaders/tests/test_function.py:317–397

()

def test_function_changed():
    ch = []

    class C(object):
        def _dep_changed(self, dep, **kwargs):
            ch.append(dep)
    ch_obj = C()

    def assert_changed(*objs):
        assert set(ch) == set(objs)
        while ch:
            ch.pop()

    fun1 = Function('void main(){$var1; $var2;}')
    fun1._dependents[ch_obj] = None
    fun1['var1'] = 'x'
    fun1['var2'] = 'y'
    assert_changed(fun1)

    fun1['var1'] = 'z'
    assert_changed(fun1)

    # same value; should result in no change events
    fun1['var1'] = 'z'
    assert_changed()

    fun1['var1'] = 0.5
    var1 = fun1['var1']
    var1._dependents[ch_obj] = None
    assert_changed(fun1)

    var1.name = 'xxx'
    assert_changed(fun1, var1)

    # changing type requires code change
    var1.value = 7
    assert_changed(fun1, var1)

    # changing value (but not type) requires no code changes
    var1.value = 6
    assert_changed()

    # test variable disconnect
    fun1['var1'] = Variable('var1', 7)
    var2 = fun1['var1']
    var2._dependents[ch_obj] = None
    # assert_changed(fun1)
    # var2 is now connected
    var2.value = (1, 2, 3, 4)
    assert_changed(fun1, var2)
    # ..but var1 no longer triggers fun1.changed
    assert_changed()
    var1.value = 0.5
    assert_changed(var1)

    # test expressions
    fun2 = Function('float fn(float x){return $var1 + x;}')
    fun3 = Function('float fn(float x){return $var1 + x;}')