Scrollable
Scrollable 是一个功能完整的可滚动容器组件,支持自定义滚动条、滚动位置跟踪以及虚拟化渲染。它同时支持纵向和横向滚动,并可按需定制显示行为。
导入
rust
use gpui_component::{
scroll::{ScrollableElement, ScrollbarAxis, ScrollbarShow},
StyledExt as _,
};用法
基础可滚动容器
让任意元素具备滚动能力的最简单方式,是使用 ScrollableElement trait 提供的 overflow_scrollbar():
overflow_scrollbar():按需为两个方向都添加滚动条。overflow_x_scrollbar():按需添加横向滚动条。overflow_y_scrollbar():按需添加纵向滚动条。
rust
use gpui::{div, Axis};
use gpui_component::ScrollableElement;
div()
.id("scrollable-container")
.size_full()
.child("Your content here")
.overflow_scrollbar()纵向滚动
rust
v_flex()
.id("scrollable-container")
.overflow_y_scrollbar()
.gap_2()
.p_4()
.child("Scrollable Content")
.children((0..100).map(|i| {
div()
.h(px(40.))
.w_full()
.bg(cx.theme().secondary)
.child(format!("Item {}", i))
}))横向滚动
rust
h_flex()
.id("scrollable-container")
.overflow_x_scrollbar()
.gap_2()
.p_4()
.children((0..50).map(|i| {
div()
.min_w(px(120.))
.h(px(80.))
.bg(cx.theme().accent)
.child(format!("Card {}", i))
}))双向滚动
rust
div()
.id("scrollable-container")
.size_full()
.overflow_scrollbar()
.child(
div()
.w(px(2000.))
.h(px(2000.))
.bg(cx.theme().background)
.child("Large content area")
)自定义滚动条
手动创建滚动条
如果你需要更高的控制粒度,可以手动创建滚动条:
rust
use gpui_component::scroll::{ScrollableElement};
pub struct ScrollableView {
scroll_handle: ScrollHandle,
}
impl Render for ScrollableView {
fn render(&mut self, _: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
div()
.relative()
.size_full()
.child(
div()
.id("content")
.track_scroll(&self.scroll_handle)
.overflow_scroll()
.size_full()
.child("Your scrollable content")
)
.vertical_scrollbar(&self.scroll_handle)
}
}虚拟化
使用 VirtualList 处理大数据集
渲染超长列表时,推荐使用 VirtualList:
rust
use gpui_component::{VirtualList, VirtualListScrollHandle};
pub struct LargeListView {
items: Vec<String>,
scroll_handle: VirtualListScrollHandle,
}
impl Render for LargeListView {
fn render(&mut self, _: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
let item_count = self.items.len();
VirtualList::new(
self.scroll_handle.clone(),
item_count,
|ix, window, cx| {
size(px(300.), px(40.))
},
|ix, bounds, selected, window, cx| {
div()
.size(bounds.size)
.bg(if selected {
cx.theme().accent
} else {
cx.theme().background
})
.child(format!("Item {}: {}", ix, self.items[ix]))
.into_any_element()
},
)
}
}滚动到指定项
rust
impl LargeListView {
fn scroll_to_item(&mut self, index: usize) {
self.scroll_handle.scroll_to_item(index, ScrollStrategy::Top);
}
fn scroll_to_item_centered(&mut self, index: usize) {
self.scroll_handle.scroll_to_item(index, ScrollStrategy::Center);
}
}可变高度项
rust
VirtualList::new(
scroll_handle,
items.len(),
|ix, window, cx| {
let height = if items[ix].len() > 50 {
px(80.)
} else {
px(40.)
};
size(px(300.), height)
},
|ix, bounds, selected, window, cx| {
// Render logic
},
)主题定制
滚动条外观
可以通过主题配置自定义滚动条样式:
rust
// In your theme JSON
{
"scrollbar.background": "#ffffff20",
"scrollbar.thumb.background": "#00000060",
"scrollbar.thumb.hover.background": "#000000"
}滚动条显示模式
控制滚动条何时显示:
rust
use gpui_component::scroll::ScrollbarShow;
theme.scrollbar_show = ScrollbarShow::Scrolling;
theme.scrollbar_show = ScrollbarShow::Hover;
theme.scrollbar_show = ScrollbarShow::Always;跟随系统设置
rust
Theme::sync_scrollbar_appearance(cx);示例
带滚动的文件浏览器
rust
pub struct FileBrowser {
files: Vec<String>,
}
impl Render for FileBrowser {
fn render(&mut self, _: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
div()
.border_1()
.border_color(cx.theme().border)
.size_full()
.child(
v_flex()
.gap_1()
.p_2()
.overflow_y_scrollbar()
.children(self.files.iter().map(|file| {
div()
.h(px(32.))
.w_full()
.px_2()
.flex()
.items_center()
.hover(|style| style.bg(cx.theme().secondary_hover))
.child(file.clone())
}))
)
}
}自动滚动到底部的聊天列表
rust
pub struct ChatView {
messages: Vec<String>,
scroll_handle: ScrollHandle,
should_auto_scroll: bool,
}
impl ChatView {
fn add_message(&mut self, message: String) {
self.messages.push(message);
if self.should_auto_scroll {
let max_offset = self.scroll_handle.max_offset();
self.scroll_handle.set_offset(point(px(0.), max_offset.y));
}
}
}带虚拟滚动的数据表格
rust
pub struct DataTable {
data: Vec<Vec<String>>,
scroll_handle: VirtualListScrollHandle,
}
impl Render for DataTable {
fn render(&mut self, _: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
VirtualList::new(
self.scroll_handle.clone(),
self.data.len(),
|_ix, _window, _cx| size(px(800.), px(32.)),
|ix, bounds, _selected, _window, cx| {
h_flex()
.size(bounds.size)
.border_b_1()
.border_color(cx.theme().border)
.children(self.data[ix].iter().map(|cell| {
div()
.flex_1()
.px_2()
.flex()
.items_center()
.child(cell.clone())
}))
.into_any_element()
},
)
}
}