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Fix scrollbar dragging, which was broken because the Slider gets

Browse Source 
recreated while we drag.

But there's still something wrong, because in the OSM viewer with a huge
list of buttons, scrolling is incredibly laggy while dragging, but not
when using the scroll wheel.
This commit is contained in:
Dustin Carlino 2020-10-28 13:56:08 -07:00
parent 37896c9d37
commit 304e723d77
2 changed files with 42 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
widgetry/src/widgets/panel.rs
View File

@ -61,6 +61,8 @@ impl Panel {
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;
@ -68,11 +70,21 @@ impl Panel {
// Unwrap the main widget from any scrollable containers if necessary.
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);
}
@ -82,26 +94,26 @@ impl Panel {
// Wrap the main widget in scrollable containers if necessary.
if self.scrollable_x {
let old_top_level = std::mem::replace(&mut self.top_level, Widget::nothing());
self.top_level = Widget::custom_col(vec![
old_top_level,
Slider::horizontal(
let mut slider = Slider::horizontal(
ctx,
self.container_dims.width,
self.container_dims.width
* (self.container_dims.width / self.contents_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),
]);
.abs(top_left.x, top_left.y + self.container_dims.height);
// We constantly destroy and recreate the scrollbar slider while dragging it. Preserve
// the dragging property, so we can keep dragging it.
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 old_top_level = std::mem::replace(&mut self.top_level, Widget::nothing());
self.top_level = Widget::custom_row(vec![
old_top_level,
Slider::vertical(
let mut slider = Slider::vertical(
ctx,
self.container_dims.height,
self.container_dims.height
@ -109,8 +121,13 @@ impl Panel {
0.0,
)
.named("vert scrollbar")
.abs(top_left.x + self.container_dims.width, top_left.y),
]);
.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);

4
widgetry/src/widgets/slider.rs
View File

@ -8,7 +8,7 @@ use crate::{
pub struct Slider {
current_percent: f64,
mouse_on_slider: bool,
dragging: bool,
pub(crate) dragging: bool,
style: Style,
@ -188,8 +188,6 @@ impl Slider {
assert!(percent >= 0.0 && percent <= 1.0);
self.current_percent = percent;
self.recalc(ctx);
// Just reset dragging, to prevent chaos
self.dragging = false;
if let Some(pt) = ctx.canvas.get_cursor_in_screen_space() {
self.mouse_on_slider = self
.slider_geom()