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use std::cell::RefCell;
use std::collections::HashSet;
use std::rc::Rc;
use stretch::geometry::Size;
use stretch::node::{Node, Stretch};
use stretch::number::Number;
use stretch::style::{Dimension, Style};
use geom::{Percent, Polygon};
use crate::widgets::slider;
use crate::widgets::spinner::SpinnerValue;
use crate::widgets::Container;
use crate::{
Autocomplete, Button, Color, Dropdown, EventCtx, GfxCtx, HorizontalAlignment, Menu, Outcome,
PersistentSplit, ScreenDims, ScreenPt, ScreenRectangle, Slider, Spinner, Stash, TextBox,
Toggle, VerticalAlignment, Widget, WidgetImpl, WidgetOutput,
};
pub struct Panel {
top_level: Widget,
cached_flexbox: Option<(Stretch, Vec<Node>, ScreenDims)>,
horiz: HorizontalAlignment,
vert: VerticalAlignment,
dims: Dims,
scrollable_x: bool,
scrollable_y: bool,
contents_dims: ScreenDims,
container_dims: ScreenDims,
clip_rect: Option<ScreenRectangle>,
}
impl Panel {
pub fn new_builder(top_level: Widget) -> PanelBuilder {
PanelBuilder {
top_level,
horiz: HorizontalAlignment::Center,
vert: VerticalAlignment::Center,
dims: Dims::MaxPercent(Percent::int(100), Percent::int(100)),
}
}
pub fn empty(ctx: &mut EventCtx) -> Panel {
Panel::new_builder(Widget::col(vec![])).build_custom(ctx)
}
fn update_container_dims_for_canvas_dims(&mut self, canvas_dims: ScreenDims) {
let new_container_dims = match self.dims {
Dims::MaxPercent(w, h) => ScreenDims::new(
self.contents_dims.width.min(w.inner() * canvas_dims.width),
self.contents_dims
.height
.min(h.inner() * canvas_dims.height),
),
Dims::ExactPercent(w, h) => {
ScreenDims::new(w * canvas_dims.width, h * canvas_dims.height)
}
Dims::ExactSize(dims) => dims,
Dims::ExactHeight(h) => {
ScreenDims::new(self.contents_dims.width.min(canvas_dims.width), h)
}
};
self.container_dims = new_container_dims;
}
fn recompute_scrollbar_layout(&mut self, ctx: &EventCtx) {
let old_scrollable_x = self.scrollable_x;
let old_scrollable_y = self.scrollable_y;
let old_scroll_offset = self.scroll_offset();
let mut was_dragging_x = false;
let mut was_dragging_y = false;
self.scrollable_x = self.contents_dims.width > self.container_dims.width;
self.scrollable_y = self.contents_dims.height > self.container_dims.height;
if old_scrollable_y {
let container = self.top_level.widget.downcast_mut::<Container>().unwrap();
was_dragging_y = container.members[1]
.widget
.downcast_ref::<Slider>()
.unwrap()
.dragging;
self.top_level = container.members.remove(0);
}
if old_scrollable_x {
let container = self.top_level.widget.downcast_mut::<Container>().unwrap();
was_dragging_x = container.members[1]
.widget
.downcast_ref::<Slider>()
.unwrap()
.dragging;
self.top_level = container.members.remove(0);
}
let mut container_dims = self.container_dims;
if self.scrollable_y {
container_dims.width += slider::SCROLLBAR_BG_WIDTH;
}
let top_left = ctx
.canvas
.align_window(container_dims, self.horiz, self.vert);
if self.scrollable_x {
let mut slider = Slider::horizontal_scrollbar(
ctx,
self.container_dims.width,
self.container_dims.width * (self.container_dims.width / self.contents_dims.width),
0.0,
)
.named("horiz scrollbar")
.abs(top_left.x, top_left.y + self.container_dims.height);
if was_dragging_x {
slider.widget.downcast_mut::<Slider>().unwrap().dragging = true;
}
let old_top_level = std::mem::replace(&mut self.top_level, Widget::nothing());
self.top_level = Widget::custom_col(vec![old_top_level, slider]);
}
if self.scrollable_y {
let mut slider = Slider::vertical_scrollbar(
ctx,
self.container_dims.height,
self.container_dims.height
* (self.container_dims.height / self.contents_dims.height),
0.0,
)
.named("vert scrollbar")
.abs(top_left.x + self.container_dims.width, top_left.y);
if was_dragging_y {
slider.widget.downcast_mut::<Slider>().unwrap().dragging = true;
}
let old_top_level = std::mem::replace(&mut self.top_level, Widget::nothing());
self.top_level = Widget::custom_row(vec![old_top_level, slider]);
}
self.update_scroll_sliders(ctx, old_scroll_offset);
self.clip_rect = if self.scrollable_x || self.scrollable_y {
Some(ScreenRectangle::top_left(top_left, self.container_dims))
} else {
None
};
}
fn recompute_layout(&mut self, ctx: &EventCtx, recompute_bg: bool) {
self.invalidate_flexbox();
self.recompute_layout_if_needed(ctx, recompute_bg)
}
fn invalidate_flexbox(&mut self) {
debug!("invalidating flexbox");
self.cached_flexbox = None;
}
fn compute_flexbox(&self) -> (Stretch, Vec<Node>, ScreenDims) {
let mut stretch = Stretch::new();
let root = stretch
.new_node(
Style {
..Default::default()
},
Vec::new(),
)
.unwrap();
let mut nodes = vec![];
self.top_level.get_flexbox(root, &mut stretch, &mut nodes);
nodes.reverse();
let container_size = Size {
width: Number::Undefined,
height: Number::Undefined,
};
stretch.compute_layout(root, container_size).unwrap();
let effective_dims = if self.scrollable_x || self.scrollable_y {
self.container_dims
} else {
let result = stretch.layout(root).unwrap();
ScreenDims::new(result.size.width.into(), result.size.height.into())
};
(stretch, nodes, effective_dims)
}
fn recompute_layout_if_needed(&mut self, ctx: &EventCtx, recompute_bg: bool) {
self.recompute_scrollbar_layout(ctx);
let (stretch, nodes, effective_dims) = self
.cached_flexbox
.take()
.unwrap_or_else(|| self.compute_flexbox());
{
let top_left = ctx
.canvas
.align_window(effective_dims, self.horiz, self.vert);
let offset = self.scroll_offset();
let mut nodes = nodes.clone();
self.top_level.apply_flexbox(
&stretch,
&mut nodes,
top_left.x,
top_left.y,
offset,
ctx,
recompute_bg,
false,
);
assert!(nodes.is_empty());
}
self.cached_flexbox = Some((stretch, nodes, effective_dims));
}
fn scroll_offset(&self) -> (f64, f64) {
let x = if self.scrollable_x {
self.slider("horiz scrollbar").get_percent()
* (self.contents_dims.width - self.container_dims.width).max(0.0)
} else {
0.0
};
let y = if self.scrollable_y {
self.slider("vert scrollbar").get_percent()
* (self.contents_dims.height - self.container_dims.height).max(0.0)
} else {
0.0
};
(x, y)
}
fn update_scroll_sliders(&mut self, ctx: &EventCtx, offset: (f64, f64)) -> bool {
let mut changed = false;
if self.scrollable_x {
changed = true;
let max = (self.contents_dims.width - self.container_dims.width).max(0.0);
if max == 0.0 {
self.slider_mut("horiz scrollbar").set_percent(ctx, 0.0);
} else {
self.slider_mut("horiz scrollbar")
.set_percent(ctx, offset.0.clamp(0.0, max) / max);
}
}
if self.scrollable_y {
changed = true;
let max = (self.contents_dims.height - self.container_dims.height).max(0.0);
if max == 0.0 {
self.slider_mut("vert scrollbar").set_percent(ctx, 0.0);
} else {
self.slider_mut("vert scrollbar")
.set_percent(ctx, offset.1.clamp(0.0, max) / max);
}
}
changed
}
fn set_scroll_offset(&mut self, ctx: &EventCtx, offset: (f64, f64)) {
if self.update_scroll_sliders(ctx, offset) {
self.recompute_layout_if_needed(ctx, false);
}
}
pub fn event(&mut self, ctx: &mut EventCtx) -> Outcome {
if (self.scrollable_x || self.scrollable_y)
&& ctx
.canvas
.get_cursor_in_screen_space()
.map(|pt| self.top_level.rect.contains(pt))
.unwrap_or(false)
{
if let Some((dx, dy)) = ctx.input.get_mouse_scroll() {
let x_offset = if self.scrollable_x {
self.scroll_offset().0 + dx * (ctx.canvas.settings.gui_scroll_speed as f64)
} else {
0.0
};
let y_offset = if self.scrollable_y {
self.scroll_offset().1 - dy * (ctx.canvas.settings.gui_scroll_speed as f64)
} else {
0.0
};
self.set_scroll_offset(ctx, (x_offset, y_offset));
}
}
if ctx.input.is_window_resized() {
self.update_container_dims_for_canvas_dims(ctx.canvas.get_window_dims());
self.recompute_layout(ctx, false);
}
let before = self.scroll_offset();
let mut output = WidgetOutput::new();
self.top_level.widget.event(ctx, &mut output);
if output.redo_layout {
self.recompute_layout(ctx, true);
} else if self.scroll_offset() != before {
self.recompute_layout_if_needed(ctx, true);
}
output.outcome
}
pub fn draw(&self, g: &mut GfxCtx) {
if let Some(ref rect) = self.clip_rect {
g.enable_clipping(rect.clone());
g.canvas.mark_covered_area(rect.clone());
} else {
g.canvas.mark_covered_area(self.top_level.rect.clone());
}
if false {
g.fork_screenspace();
g.draw_polygon(Color::RED.alpha(0.5), self.top_level.rect.to_polygon());
let top_left = g
.canvas
.align_window(self.container_dims, self.horiz, self.vert);
g.draw_polygon(
Color::BLUE.alpha(0.5),
Polygon::rectangle(self.container_dims.width, self.container_dims.height)
.translate(top_left.x, top_left.y),
);
g.unfork();
}
self.top_level.draw(g);
if self.scrollable_x || self.scrollable_y {
g.disable_clipping();
if self.scrollable_x {
self.slider("horiz scrollbar").draw(g);
}
if self.scrollable_y {
self.slider("vert scrollbar").draw(g);
}
}
}
pub fn get_all_click_actions(&self) -> HashSet<String> {
let mut actions = HashSet::new();
self.top_level.get_all_click_actions(&mut actions);
actions
}
pub fn restore(&mut self, ctx: &mut EventCtx, prev: &Panel) {
self.set_scroll_offset(ctx, prev.scroll_offset());
self.top_level.restore(ctx, prev);
ctx.no_op_event(true, |ctx| {
assert!(matches!(self.event(ctx), Outcome::Nothing))
});
}
pub fn scroll_to_member(&mut self, ctx: &EventCtx, name: String) {
if let Some(w) = self.top_level.find(&name) {
let y1 = w.rect.y1;
self.set_scroll_offset(ctx, (0.0, y1));
} else {
panic!("Can't scroll_to_member of unknown {}", name);
}
}
pub fn has_widget(&self, name: &str) -> bool {
self.top_level.find(name).is_some()
}
pub fn slider(&self, name: &str) -> &Slider {
self.find(name)
}
pub fn slider_mut(&mut self, name: &str) -> &mut Slider {
self.find_mut(name)
}
pub fn take_menu_choice<T: 'static>(&mut self, name: &str) -> T {
self.find_mut::<Menu<T>>(name).take_current_choice()
}
pub fn is_checked(&self, name: &str) -> bool {
self.find::<Toggle>(name).enabled
}
pub fn maybe_is_checked(&self, name: &str) -> Option<bool> {
if self.has_widget(name) {
Some(self.find::<Toggle>(name).enabled)
} else {
None
}
}
pub fn text_box(&self, name: &str) -> String {
self.find::<TextBox>(name).get_line()
}
pub fn spinner<T: 'static + SpinnerValue>(&self, name: &str) -> T {
self.find::<Spinner<T>>(name).current
}
pub fn modify_spinner<T: 'static + SpinnerValue>(
&mut self,
ctx: &EventCtx,
name: &str,
delta: T,
) {
self.find_mut::<Spinner<T>>(name).modify(ctx, delta)
}
pub fn dropdown_value<T: 'static + PartialEq + Clone, I: AsRef<str>>(&self, name: I) -> T {
self.find::<Dropdown<T>>(name.as_ref()).current_value()
}
pub fn maybe_dropdown_value<T: 'static + PartialEq + Clone, I: AsRef<str>>(
&self,
name: I,
) -> Option<T> {
let name = name.as_ref();
if self.has_widget(name) {
Some(self.find::<Dropdown<T>>(name).current_value())
} else {
None
}
}
pub fn persistent_split_value<T: 'static + PartialEq + Clone>(&self, name: &str) -> T {
self.find::<PersistentSplit<T>>(name).current_value()
}
pub fn autocomplete_done<T: 'static + Clone>(&mut self, name: &str) -> Option<Vec<T>> {
self.find_mut::<Autocomplete<T>>(name).take_final_value()
}
pub fn stash<T: 'static>(&self, name: &str) -> Rc<RefCell<T>> {
self.find::<Stash<T>>(name).get_value()
}
pub fn clone_stashed<T: 'static + Clone>(&self, name: &str) -> T {
self.find::<Stash<T>>(name).get_value().borrow().clone()
}
pub fn is_button_enabled(&self, name: &str) -> bool {
self.find::<Button>(name).is_enabled()
}
pub fn maybe_find(&self, name: &str) -> Option<&Widget> {
self.top_level.find(name)
}
pub fn find<T: WidgetImpl>(&self, name: &str) -> &T {
if let Some(w) = self.top_level.find(name) {
if let Some(x) = w.widget.downcast_ref::<T>() {
x
} else {
panic!("Found widget {}, but wrong type", name);
}
} else {
panic!("Can't find widget {}", name);
}
}
pub fn find_mut<T: WidgetImpl>(&mut self, name: &str) -> &mut T {
if let Some(w) = self.top_level.find_mut(name) {
if let Some(x) = w.widget.downcast_mut::<T>() {
x
} else {
panic!("Found widget {}, but wrong type", name);
}
} else {
panic!("Can't find widget {}", name);
}
}
pub(crate) fn swap_inner_content(
&mut self,
ctx: &EventCtx,
container_name: &str,
new_inner_content: &mut Widget,
) {
let old_container: &mut Container = self.find_mut(container_name);
assert_eq!(
old_container.members.len(),
1,
"method only intended to be used for containers created with `Widget::container`"
);
std::mem::swap(&mut old_container.members[0], new_inner_content);
self.recompute_layout(ctx, true);
}
pub fn rect_of(&self, name: &str) -> &ScreenRectangle {
&self.top_level.find(name).unwrap().rect
}
pub fn center_of(&self, name: &str) -> ScreenPt {
self.rect_of(name).center()
}
pub fn center_of_panel(&self) -> ScreenPt {
self.top_level.rect.center()
}
pub fn panel_dims(&self) -> ScreenDims {
self.top_level.rect.dims()
}
pub fn align(&mut self, horiz: HorizontalAlignment, vert: VerticalAlignment) {
self.horiz = horiz;
self.vert = vert;
}
pub fn replace(&mut self, ctx: &mut EventCtx, id: &str, mut new: Widget) {
if let Some(ref new_id) = new.id {
assert_eq!(id, new_id);
}
new = new.named(id);
let old = self
.top_level
.find_mut(id)
.unwrap_or_else(|| panic!("Panel doesn't have {}", id));
new.layout.style = old.layout.style;
*old = new;
self.recompute_layout(ctx, true);
}
pub fn take(&mut self, id: &str) -> Widget {
self.top_level.take(id).unwrap()
}
pub fn clicked_outside(&self, ctx: &mut EventCtx) -> bool {
!self.top_level.rect.contains(ctx.canvas.get_cursor()) && ctx.normal_left_click()
}
pub fn currently_hovering(&self) -> Option<&String> {
self.top_level.currently_hovering()
}
}
pub struct PanelBuilder {
top_level: Widget,
horiz: HorizontalAlignment,
vert: VerticalAlignment,
dims: Dims,
}
enum Dims {
MaxPercent(Percent, Percent),
ExactPercent(f64, f64),
ExactHeight(f64),
ExactSize(ScreenDims),
}
impl PanelBuilder {
pub fn build(mut self, ctx: &mut EventCtx) -> Panel {
self.top_level = self.top_level.padding(16).bg(ctx.style.panel_bg);
self.build_custom(ctx)
}
pub fn build_custom(self, ctx: &mut EventCtx) -> Panel {
let mut panel = Panel {
top_level: self.top_level,
horiz: self.horiz,
vert: self.vert,
dims: self.dims,
scrollable_x: false,
scrollable_y: false,
contents_dims: ScreenDims::new(0.0, 0.0),
container_dims: ScreenDims::new(0.0, 0.0),
clip_rect: None,
cached_flexbox: None,
};
match panel.dims {
Dims::ExactPercent(w, h) => {
panel.top_level.layout.style.min_size = Size {
width: Dimension::Points((w * ctx.canvas.window_width) as f32),
height: Dimension::Points((h * ctx.canvas.window_height) as f32),
};
}
Dims::ExactHeight(h) => {
panel.top_level.layout.style.min_size.height = Dimension::Points(h as f32);
}
Dims::ExactSize(dims) => {
panel.top_level.layout.style.min_size = dims.into();
}
Dims::MaxPercent(_, _) => {}
}
panel.recompute_layout(ctx, false);
panel.contents_dims =
ScreenDims::new(panel.top_level.rect.width(), panel.top_level.rect.height());
panel.update_container_dims_for_canvas_dims(ctx.canvas.get_window_dims());
panel.recompute_layout(ctx, false);
panel.get_all_click_actions();
ctx.no_op_event(true, |ctx| {
assert!(matches!(panel.event(ctx), Outcome::Nothing))
});
panel
}
pub fn aligned(mut self, horiz: HorizontalAlignment, vert: VerticalAlignment) -> PanelBuilder {
self.horiz = horiz;
self.vert = vert;
self
}
pub fn aligned_pair(mut self, pair: (HorizontalAlignment, VerticalAlignment)) -> PanelBuilder {
self.horiz = pair.0;
self.vert = pair.1;
self
}
pub fn max_size(mut self, width: Percent, height: Percent) -> PanelBuilder {
if width == Percent::int(100) && height == Percent::int(100) {
panic!("By default, Panels are capped at 100% of the screen. This is redundant.");
}
self.dims = Dims::MaxPercent(width, height);
self
}
pub fn exact_size_percent(mut self, pct_width: usize, pct_height: usize) -> PanelBuilder {
self.dims = Dims::ExactPercent((pct_width as f64) / 100.0, (pct_height as f64) / 100.0);
self
}
pub fn exact_height(mut self, height: f64) -> PanelBuilder {
self.dims = Dims::ExactHeight(height);
self
}
pub fn exact_size(mut self, size: ScreenDims) -> PanelBuilder {
self.dims = Dims::ExactSize(size);
self
}
}