# Copyright 2021 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import time
from telemetry.internal.actions import page_action
from telemetry.page import shared_page_state
from page_sets.rendering import rendering_story
from page_sets.rendering import story_tags
TOUGH_SCROLLBAR_UMA = [
'Graphics.Smoothness.Checkerboarding3.ScrollbarScroll',
]
class ToughFastScrollbarScrollingPage(rendering_story.RenderingStory):
ABSTRACT_STORY = True
SPEED_IN_PIXELS_PER_SECOND = None
SYNTHETIC_GESTURE_SOURCE = page_action.GESTURE_SOURCE_MOUSE
TAGS = [story_tags.GPU_RASTERIZATION, story_tags.TOUGH_SCROLLBAR_SCROLLING]
def __init__(self,
page_set,
shared_page_state_class=shared_page_state.SharedPageState,
name_suffix='',
extra_browser_args=None):
super(ToughFastScrollbarScrollingPage,
self).__init__(page_set=page_set,
shared_page_state_class=shared_page_state_class,
name_suffix=name_suffix,
extra_browser_args=extra_browser_args)
def RunPageInteractions(self, action_runner):
scrollbar_x, scrollbar_top, scrollbar_bottom, top_button, bottom_button = \
self._ScrollBarRatios(action_runner)
start = time.time()
with action_runner.CreateGestureInteraction('DragAction'):
direction = 'down'
while time.time() - start < 15:
if direction == 'down':
action_runner.DragPage(
left_start_ratio=scrollbar_x,
top_start_ratio=scrollbar_top,
left_end_ratio=scrollbar_x,
top_end_ratio=bottom_button,
speed_in_pixels_per_second=self.SPEED_IN_PIXELS_PER_SECOND)
else:
action_runner.DragPage(
left_start_ratio=scrollbar_x,
top_start_ratio=scrollbar_bottom,
left_end_ratio=scrollbar_x,
top_end_ratio=top_button,
speed_in_pixels_per_second=self.SPEED_IN_PIXELS_PER_SECOND)
direction = 'up' if direction == 'down' else 'down'
def _ScrollBarRatios(self, action_runner):
# Calculate scrollbar thickness by adding an element to the page.
# Record the client width of that element, and then add a long child
# element so that the first element includes a scrollbar. Record the
# client width again and then calculate the difference to get the
# scrollbar thickness.
scrollbar_thickness = float(
action_runner.EvaluateJavaScript('''
(function() {
window.__scrollableElementForTelemetry = document.scrollingElement;
var container = document.createElement("div");
container.style.width = "100px";
container.style.height = "100px";
container.style.position = "absolute";
container.style.visibility = "hidden";
container.style.overflow = "auto";
document.body.appendChild(container);
var widthBefore = container.clientWidth;
var longContent = document.createElement("div");
longContent.style.height = "1000px";
container.appendChild(longContent);
var widthAfter = container.clientWidth;
container.remove();
window.__scrollbarThickness = widthBefore - widthAfter;
return window.__scrollbarThickness;
})();'''))
window_width = float(action_runner.EvaluateJavaScript('window.innerWidth'))
window_height = float(
action_runner.EvaluateJavaScript('window.innerHeight'))
# Works only when there is no horizontally overflowing content.
left_margin = float(
action_runner.EvaluateJavaScript(
'document.body.getBoundingClientRect().x'))
body_width = float(
action_runner.EvaluateJavaScript(
'document.body.getBoundingClientRect().width'))
top_margin = float(
action_runner.EvaluateJavaScript(
'document.body.getBoundingClientRect().y'))
window_height = window_height - top_margin
# For regular scrollbars the minimal thumb length is one and two times the
# track's width in W10 and W11 respectively. For Fluent scrollbars the
# minimal thumb length is 17px. The constant was chosen such that:
# (Button Length) <= (Track width * |track_to_arrow_button_ratio|) <=
# (Button Length + Minimum thumb length) for all scrollbars.
track_to_arrow_button_ratio = 1.8
top = (scrollbar_thickness * track_to_arrow_button_ratio -
top_margin) / (window_height)
bottom = 1 - (scrollbar_thickness *
track_to_arrow_button_ratio) / window_height
scrollbar_mid_x = (window_width - left_margin -
(scrollbar_thickness / 2)) / body_width
# Ensure the thumb goes through the full range of motion. These
# variables make the the mouse drag until the middle of the scrollbar
# buttons.
top_button = ((scrollbar_thickness / 2) - top_margin) / window_height
bottom_button = 1 - (scrollbar_thickness / 2) / window_height
return scrollbar_mid_x, top, bottom, top_button, bottom_button
def WillStartTracing(self, chrome_trace_config):
chrome_trace_config.EnableUMAHistograms(*TOUGH_SCROLLBAR_UMA)
class ScrollbarScrollingText100Page(ToughFastScrollbarScrollingPage):
BASE_NAME = 'text_scrollbar_100_pixels_per_second'
URL = 'file://../tough_scrolling_cases/text.html'
SPEED_IN_PIXELS_PER_SECOND = 100
class ScrollbarScrollingText200Page(ToughFastScrollbarScrollingPage):
BASE_NAME = 'text_scrollbar_200_pixels_per_second'
URL = 'file://../tough_scrolling_cases/text.html'
SPEED_IN_PIXELS_PER_SECOND = 400
class ScrollbarScrollingText300Page(ToughFastScrollbarScrollingPage):
BASE_NAME = 'text_scrollbar_700_pixels_per_second'
URL = 'file://../tough_scrolling_cases/text.html'
SPEED_IN_PIXELS_PER_SECOND = 700
class ScrollbarScrollingText1200Page(ToughFastScrollbarScrollingPage):
BASE_NAME = 'text_scrollbar_1200_pixels_per_second'
URL = 'file://../tough_scrolling_cases/text.html'
SPEED_IN_PIXELS_PER_SECOND = 1200
class ScrollbarScrollingText2300Page(ToughFastScrollbarScrollingPage):
BASE_NAME = 'text_scrollbar_2300_pixels_per_second'
URL = 'file://../tough_scrolling_cases/text.html'
SPEED_IN_PIXELS_PER_SECOND = 2300
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