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Reduce unnecessary winit cursor changes

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This commit is contained in:
Joonas Javanainen 2020-07-07 23:33:04 +03:00
parent c575dec15b
commit 2edfb4bf85
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GPG Key ID: D39CCA5CB19B9179
1 changed files with 53 additions and 50 deletions
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103
imgui-winit-support/src/lib.rs
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@ -105,6 +105,50 @@ use winit::{
pub struct WinitPlatform {
hidpi_mode: ActiveHiDpiMode,
hidpi_factor: f64,
cursor_cache: Option<CursorSettings>,
}
#[derive(Debug, Copy, Clone, Eq, PartialEq)]
struct CursorSettings {
cursor: Option<imgui::MouseCursor>,
draw_cursor: bool,
}
fn to_winit_cursor(cursor: imgui::MouseCursor) -> MouseCursor {
match cursor {
imgui::MouseCursor::Arrow => MouseCursor::Arrow,
imgui::MouseCursor::TextInput => MouseCursor::Text,
imgui::MouseCursor::ResizeAll => MouseCursor::Move,
imgui::MouseCursor::ResizeNS => MouseCursor::NsResize,
imgui::MouseCursor::ResizeEW => MouseCursor::EwResize,
imgui::MouseCursor::ResizeNESW => MouseCursor::NeswResize,
imgui::MouseCursor::ResizeNWSE => MouseCursor::NwseResize,
imgui::MouseCursor::Hand => MouseCursor::Hand,
imgui::MouseCursor::NotAllowed => MouseCursor::NotAllowed,
}
}
impl CursorSettings {
#[cfg(feature = "winit-19")]
fn apply(&self, window: &Window) {
match self.cursor {
Some(mouse_cursor) if !self.draw_cursor => {
window.hide_cursor(false);
window.set_cursor(to_winit_cursor(mouse_cursor));
}
_ => window.hide_cursor(true),
}
}
#[cfg(any(feature = "winit-20", feature = "winit-22"))]
fn apply(&self, window: &Window) {
match self.cursor {
Some(mouse_cursor) if !self.draw_cursor => {
window.set_cursor_visible(true);
window.set_cursor_icon(to_winit_cursor(mouse_cursor));
}
_ => window.set_cursor_visible(false),
}
}
}
#[derive(Copy, Clone, Debug, PartialEq)]
@ -188,6 +232,7 @@ impl WinitPlatform {
WinitPlatform {
hidpi_mode: ActiveHiDpiMode::Default,
hidpi_factor: 1.0,
cursor_cache: None,
}
}
/// Attaches the platform instance to a winit window.
@ -681,61 +726,19 @@ impl WinitPlatform {
/// This function performs the following actions:
///
/// * mouse cursor is changed and/or hidden (if requested by imgui-rs)
#[cfg(feature = "winit-19")]
pub fn prepare_render(&self, ui: &Ui, window: &Window) {
pub fn prepare_render(&mut self, ui: &Ui, window: &Window) {
let io = ui.io();
if !io
.config_flags
.contains(ConfigFlags::NO_MOUSE_CURSOR_CHANGE)
{
match ui.mouse_cursor() {
Some(mouse_cursor) if !io.mouse_draw_cursor => {
window.hide_cursor(false);
window.set_cursor(match mouse_cursor {
imgui::MouseCursor::Arrow => MouseCursor::Arrow,
imgui::MouseCursor::TextInput => MouseCursor::Text,
imgui::MouseCursor::ResizeAll => MouseCursor::Move,
imgui::MouseCursor::ResizeNS => MouseCursor::NsResize,
imgui::MouseCursor::ResizeEW => MouseCursor::EwResize,
imgui::MouseCursor::ResizeNESW => MouseCursor::NeswResize,
imgui::MouseCursor::ResizeNWSE => MouseCursor::NwseResize,
imgui::MouseCursor::Hand => MouseCursor::Hand,
imgui::MouseCursor::NotAllowed => MouseCursor::NotAllowed,
});
}
_ => window.hide_cursor(true),
}
}
}
/// Render preparation callback.
///
/// Call this before calling the imgui-rs UI `render_with`/`render` function.
/// This function performs the following actions:
///
/// * mouse cursor is changed and/or hidden (if requested by imgui-rs)
#[cfg(any(feature = "winit-20", feature = "winit-22"))]
pub fn prepare_render(&self, ui: &Ui, window: &Window) {
let io = ui.io();
if !io
.config_flags
.contains(ConfigFlags::NO_MOUSE_CURSOR_CHANGE)
{
match ui.mouse_cursor() {
Some(mouse_cursor) if !io.mouse_draw_cursor => {
window.set_cursor_visible(true);
window.set_cursor_icon(match mouse_cursor {
imgui::MouseCursor::Arrow => MouseCursor::Arrow,
imgui::MouseCursor::TextInput => MouseCursor::Text,
imgui::MouseCursor::ResizeAll => MouseCursor::Move,
imgui::MouseCursor::ResizeNS => MouseCursor::NsResize,
imgui::MouseCursor::ResizeEW => MouseCursor::EwResize,
imgui::MouseCursor::ResizeNESW => MouseCursor::NeswResize,
imgui::MouseCursor::ResizeNWSE => MouseCursor::NwseResize,
imgui::MouseCursor::Hand => MouseCursor::Hand,
imgui::MouseCursor::NotAllowed => MouseCursor::NotAllowed,
});
}
_ => window.set_cursor_visible(false),
let cursor = CursorSettings {
cursor: ui.mouse_cursor(),
draw_cursor: io.mouse_draw_cursor,
};
if self.cursor_cache != Some(cursor) {
cursor.apply(window);
self.cursor_cache = Some(cursor);
}
}
}