在javaFX中，为什么将鼠标悬停在它们上时我的按钮有时会随机收缩？
为什么会发生这种情况以及如何阻止它。
这是我描述的按钮的代码，但是我不知道您是否需要它。它似乎也发生在其他按钮上，并且并不总是发生在同一按钮上。
btnNext = new Button(">");
btnNext.setOnAction(e -> {
switch (view) {
case MONTH:
setDisplay(target.plusMonths(1));
break;
case WEEK:
setDisplay(target.plusWeeks(1));
break;
}
});
这只会在我单击它然后离开后发生。程序第一次启动时，它是正常大小。
答案 0 :(得分：1)
当控件缩小时，通常这是一个好兆头，表明其他东西正在窃取远离它的空间。在正常情况下，import bs4
def add_custom_plotly_events(
filename,
events = {
"plotly_click": "function plotly_click(data) { console.log(data); }",
"plotly_hover": "function plotly_hover(data) { console.log(data); }"
},
prettify_html = True
):
# what the value we're looking for the javascript
find_string = "Plotly.newPlot"
# stop if we find this value
stop_string = "then(function(myPlot)"
def locate_newplot_script_tag(soup):
scripts = soup.find_all('script')
script_tag = soup.find_all(string=re.compile(find_string))
if len(script_tag) == 0:
raise ValueError("Couldn't locate the newPlot javascript in {}".format(filename))
elif len(script_tag) > 1:
raise ValueError("Located multiple newPlot javascript in {}".format(filename))
if script_tag[0].find(stop_string) > -1:
raise ValueError("Already updated javascript, it contains:", stop_string)
return script_tag[0]
def split_javascript_lines(new_plot_script_tag):
return new_plot_script_tag.string.split(";")
def find_newplot_creation_line(javascript_lines):
for index, line in enumerate(javascript_lines):
if line.find(find_string) > -1:
return index, line
raise ValueError("Missing new plot creation in javascript, couldn't find:", find_string)
def join_javascript_lines(javascript_lines):
# join the lines with javascript line terminator ;
return ";".join(javascript_lines)
def register_on_events(events):
on_events_registration = []
for function_name in events:
on_events_registration.append("myPlot.on('{}', {})".format(
function_name, function_name
))
return on_events_registration
# load the file
with open(filename) as inf:
txt = inf.read()
soup = bs4.BeautifulSoup(txt, "lxml")
new_plot_script_tag = locate_newplot_script_tag(soup)
javascript_lines = split_javascript_lines(new_plot_script_tag)
line_index, line_text = find_newplot_creation_line(javascript_lines)
on_events_registration = register_on_events(events)
# replace whitespace characters with actual whitespace
# using + to concat the strings as {} in format
# causes fun times with {} as the brackets in js
# could possibly overcome this with in ES6 arrows and such
line_text = line_text + ".then(function(myPlot) { " + join_javascript_lines(on_events_registration) +" })".replace('\n', ' ').replace('\r', '')
# now add the function bodies we've register in the on handles
for function_name in events:
javascript_lines.append(events[function_name])
# update the specific line
javascript_lines[line_index] = line_text
# update the text of the script tag
new_plot_script_tag.string.replace_with(join_javascript_lines(javascript_lines))
# save the file again
with open(filename, "w") as outf:
# tbh the pretty out is still ugly af
if prettify_html:
for line in soup.prettify(formatter = None):
outf.write(str(line))
else:
outf.write(str(soup))
会询问所有后代节点自己需要渲染多少空间-Scene和prefWidth就是这样做的。
当存在空间限制时，大多数prefHeight子类（请注意Pane子类根据某些规则管理子代）将尝试减小一个或多个子代的大小。如果您不希望特定的Pane缩小到其计算得出的大小以下，则必须 指定Node和/或minWidth或进行设置到minHeight。将其中一个或两个都设置为USE_PREF_SIZE会告诉父节点该节点一定不能收缩。
但是，如果为所有节点指定USE_PREF_SIZE，则父节点会遇到麻烦-已被告知要收缩，但不能收缩任何东西。我不知道会发生什么，但是很可能整个UI看起来都很奇怪。