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test_links.py
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test_links.py
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try:
import holoviews as hv
except ImportError:
hv = None
import pytest
from bokeh.plotting import figure
from panel.layout import Row
from panel.links import Link
from panel.pane import Bokeh, HoloViews
from panel.tests.util import hv_available
from panel.widgets import (
ColorPicker, DatetimeInput, FloatInput, FloatSlider, RangeSlider,
TextInput,
)
def test_widget_link_bidirectional():
t1 = TextInput()
t2 = TextInput()
t1.link(t2, value='value', bidirectional=True)
t1.value = 'ABC'
assert t1.value == 'ABC'
assert t2.value == 'ABC'
t2.value = 'DEF'
assert t1.value == 'DEF'
assert t2.value == 'DEF'
def test_widget_jslink_bidirectional(document, comm):
t1 = TextInput()
t2 = TextInput()
t1.jslink(t2, value='value', bidirectional=True)
row = Row(t1, t2)
model = row.get_root(document, comm)
tm1, tm2 = model.children
link1_customjs = tm1.js_property_callbacks['change:value'][-1]
link2_customjs = tm2.js_property_callbacks['change:value'][-1]
assert link1_customjs.args['source'] is tm1
assert link2_customjs.args['source'] is tm2
assert link1_customjs.args['target'] is tm2
assert link2_customjs.args['target'] is tm1
def test_widget_link_source_param_not_found():
t1 = TextInput()
t2 = TextInput()
with pytest.raises(ValueError) as excinfo:
t1.jslink(t2, value1='value')
assert "Could not jslink \'value1\' parameter" in str(excinfo)
def test_widget_link_target_param_not_found():
t1 = TextInput()
t2 = TextInput()
with pytest.raises(ValueError) as excinfo:
t1.jslink(t2, value='value1')
assert "Could not jslink \'value1\' parameter" in str(excinfo)
def test_widget_link_no_transform_error():
t1 = DatetimeInput()
t2 = TextInput()
with pytest.raises(ValueError) as excinfo:
t1.jslink(t2, value='value')
assert "Cannot jslink \'value\' parameter on DatetimeInput object" in str(excinfo)
def test_widget_link_no_target_transform_error():
t1 = DatetimeInput()
t2 = TextInput()
with pytest.raises(ValueError) as excinfo:
t2.jslink(t1, value='value')
assert ("Cannot jslink 'value' parameter on TextInput object to 'value' parameter on DatetimeInput") in str(excinfo)
@hv_available
def test_pnwidget_hvplot_links(document, comm):
size_widget = FloatSlider(value=5, start=1, end=10)
points1 = hv.Points([1, 2, 3])
size_widget.jslink(points1, value='glyph.size')
row = Row(HoloViews(points1, backend='bokeh'), size_widget)
model = row.get_root(document, comm=comm)
hv_views = row.select(HoloViews)
widg_views = row.select(FloatSlider)
assert len(hv_views) == 1
assert len(widg_views) == 1
slider = widg_views[0]._models[model.ref['id']][0]
scatter = hv_views[0]._plots[model.ref['id']][0].handles['glyph']
link_customjs = slider.js_property_callbacks['change:value'][-1]
assert link_customjs.args['source'] is slider
assert link_customjs.args['target'] is scatter
code = """
var value = source['value'];
value = value;
value = value;
try {
var property = target.properties['size'];
if (property !== undefined) { property.validate(value); }
} catch(err) {
console.log('WARNING: Could not set size on target, raised error: ' + err);
return;
}
try {
target['size'] = value;
} catch(err) {
console.log(err)
}
"""
assert link_customjs.code == code
@hv_available
def test_bkwidget_hvplot_links(document, comm):
from bokeh.models import Slider
bokeh_widget = Slider(value=5, start=1, end=10, step=1e-1)
points1 = hv.Points([1, 2, 3])
Link(bokeh_widget, points1, properties={'value': 'glyph.size'})
row = Row(HoloViews(points1, backend='bokeh'), bokeh_widget)
model = row.get_root(document, comm=comm)
hv_views = row.select(HoloViews)
assert len(hv_views) == 1
slider = bokeh_widget
scatter = hv_views[0]._plots[model.ref['id']][0].handles['glyph']
link_customjs = slider.js_property_callbacks['change:value'][-1]
assert link_customjs.args['source'] is slider
assert link_customjs.args['target'] is scatter
code = """
var value = source['value'];
value = value;
value = value;
try {
var property = target.properties['size'];
if (property !== undefined) { property.validate(value); }
} catch(err) {
console.log('WARNING: Could not set size on target, raised error: ' + err);
return;
}
try {
target['size'] = value;
} catch(err) {
console.log(err)
}
"""
assert link_customjs.code == code
def test_bkwidget_bkplot_links(document, comm):
from bokeh.models import Slider
bokeh_widget = Slider(value=5, start=1, end=10, step=1e-1)
bokeh_fig = figure()
scatter = bokeh_fig.scatter([1, 2, 3], [1, 2, 3])
Link(bokeh_widget, scatter, properties={'value': 'glyph.size'})
row = Row(bokeh_fig, bokeh_widget)
row.get_root(document, comm=comm)
slider = bokeh_widget
link_customjs = slider.js_property_callbacks['change:value'][-1]
assert link_customjs.args['source'] is slider
assert link_customjs.args['target'] is scatter.glyph
code = """
var value = source['value'];
value = value;
value = value;
try {
var property = target.properties['size'];
if (property !== undefined) { property.validate(value); }
} catch(err) {
console.log('WARNING: Could not set size on target, raised error: ' + err);
return;
}
try {
target['size'] = value;
} catch(err) {
console.log(err)
}
"""
assert link_customjs.code == code
def test_widget_bkplot_link(document, comm):
widget = ColorPicker(value='#ff00ff')
bokeh_fig = figure()
scatter = bokeh_fig.scatter([1, 2, 3], [1, 2, 3])
widget.jslink(scatter.glyph, value='fill_color')
row = Row(bokeh_fig, widget)
model = row.get_root(document, comm=comm)
link_customjs = model.children[1].js_property_callbacks['change:color'][-1]
assert link_customjs.args['source'] is model.children[1]
assert link_customjs.args['target'] is scatter.glyph
assert scatter.glyph.fill_color == '#ff00ff'
code = """
var value = source['color'];
value = value;
value = value;
try {
var property = target.properties['fill_color'];
if (property !== undefined) { property.validate(value); }
} catch(err) {
console.log('WARNING: Could not set fill_color on target, raised error: ' + err);
return;
}
try {
target['fill_color'] = value;
} catch(err) {
console.log(err)
}
"""
assert link_customjs.code == code
def test_bokeh_figure_jslink(document, comm):
fig = figure()
fig.line(0, 0)
pane = Bokeh(fig)
t1 = FloatInput()
pane.jslink(t1, **{'x_range.start': 'value'})
row = Row(pane, t1)
model = row.get_root(document, comm)
link_customjs = fig.x_range.js_property_callbacks['change:start'][-1]
assert link_customjs.args['source'] == fig.x_range
assert link_customjs.args['target'] == model.children[1]
assert link_customjs.code == """
var value = source['start'];
value = value;
value = value;
try {
var property = target.properties['value'];
if (property !== undefined) { property.validate(value); }
} catch(err) {
console.log('WARNING: Could not set value on target, raised error: ' + err);
return;
}
try {
target['value'] = value;
} catch(err) {
console.log(err)
}
"""
def test_widget_jscallback(document, comm):
widget = ColorPicker(value='#ff00ff')
widget.jscallback(value='some_code')
model = widget.get_root(document, comm=comm)
customjs = model.js_property_callbacks['change:color'][-1]
assert customjs.args['source'] is model
assert customjs.code == "try { some_code } catch(err) { console.log(err) }"
def test_widget_jscallback_args_scalar(document, comm):
widget = ColorPicker(value='#ff00ff')
widget.jscallback(value='some_code', args={'scalar': 1})
model = widget.get_root(document, comm=comm)
customjs = model.js_property_callbacks['change:color'][-1]
assert customjs.args['scalar'] == 1
def test_widget_jscallback_args_model(document, comm):
widget = ColorPicker(value='#ff00ff')
widget2 = ColorPicker(value='#ff00ff')
widget.jscallback(value='some_code', args={'widget': widget2})
model = Row(widget, widget2).get_root(document, comm=comm)
customjs = model.children[0].js_property_callbacks['change:color'][-1]
assert customjs.args['source'] is model.children[0]
assert customjs.args['widget'] is model.children[1]
assert customjs.code == "try { some_code } catch(err) { console.log(err) }"
@hv_available
def test_hvplot_jscallback(document, comm):
points1 = hv.Points([1, 2, 3])
hvplot = HoloViews(points1, backend='bokeh')
hvplot.jscallback(**{'x_range.start': "some_code"})
model = hvplot.get_root(document, comm=comm)
x_range = hvplot._plots[model.ref['id']][0].handles['x_range']
customjs = x_range.js_property_callbacks['change:start'][-1]
assert customjs.args['source'] is x_range
assert customjs.code == "try { some_code } catch(err) { console.log(err) }"
@hv_available
def test_link_with_customcode(document, comm):
range_widget = RangeSlider(start=0., end=1.)
curve = hv.Curve([])
code = """
x_range.start = source.value[0]
x_range.end = source.value[1]
"""
range_widget.jslink(curve, code={'value': code})
row = Row(HoloViews(curve, backend='bokeh'), range_widget)
range_widget.value = (0.5, 0.7)
model = row.get_root(document, comm=comm)
hv_views = row.select(HoloViews)
widg_views = row.select(RangeSlider)
assert len(hv_views) == 1
assert len(widg_views) == 1
range_slider = widg_views[0]._models[model.ref['id']][0]
x_range = hv_views[0]._plots[model.ref['id']][0].handles['x_range']
link_customjs = range_slider.js_property_callbacks['change:value'][-1]
assert link_customjs.args['source'] is range_slider
assert link_customjs.args['x_range'] is x_range
assert link_customjs.code == "try { %s } catch(err) { console.log(err) }" % code