问题描述
让我们以 calculator.py 为例。
要添加与鼠标滚轮一起使用的滚动条,您需要更改:
output_field = TextArea(style="class:output-field",text=help_text)
到:
output_field = TextArea(style="class:output-field",text=help_text,scrollbar=True)
但是您会添加或更改什么来使用向上翻页和向下翻页键滚动 TextArea?
# The key bindings.
kb = KeyBindings()
@kb.add("pageup")
def _(event):
# What goes here?
pass
@kb.add("pagedown")
def _(event):
# What goes here?
pass
解决方法
改变焦点
最简单的方法可能是导入 focus_next
(或 focus_previous
)
from prompt_toolkit.key_binding.bindings.focus import focus_next
并将其绑定到 Control-Space(或其他任何东西)。
# The key bindings.
kb = KeyBindings()
kb.add("c-space")(focus_next)
保持专注
您也可以将input_field
的重点放在scroll_page_up
上,导入scroll_page_down
和from prompt_toolkit.key_binding.bindings.page_navigation import scroll_page_up,scroll_page_down
output_field
然后将焦点切换到 scroll_page_up
,调用 scroll_page_down
/input_field
,最后将焦点切换回 # The key bindings.
kb = KeyBindings()
@kb.add("pageup")
def _(event):
w = event.app.layout.current_window
event.app.layout.focus(output_field.window)
scroll_page_up(event)
event.app.layout.focus(w)
@kb.add("pagedown")
def _(event):
w = event.app.layout.current_window
event.app.layout.focus(output_field.window)
scroll_page_down(event)
event.app.layout.focus(w)
。
<asp:Button ID="Button1" class="btn btn-outline-info btn-block btn-sm" runat="server"
Text="Add to Cart" OnClick="Button1_Click"
MyPKID = '<%# Eval("ID") %>'
MyRow = '<%# Container.DataItemIndex %>'
/>