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examples: Add support for changing mouse cursor

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If ImGui's mouse_draw_cursor is set to `true`, then ImGui draws the
cursor by itself, so this commits hids the OS cursor.

If ImGui's mouse_draw_cursor is set to `false`, then this commits
updates the OS cursor to the value set by the `set_mouse_cursor`
function provided by the ImGui instance.

For our use case, it seems safe to unwrap the result of the call to
glutin::Window::set_cursor_state, as an error can only potentially when
the `Grab` cursor state is used [1]. In ImGui's use case, the `Grab` state
is never used.

[1] https://docs.rs/crate/winit/0.11.2/source/src/platform/linux/x11/window.rs
This commit is contained in:
Malik Olivier Boussejra 2018-03-26 13:51:19 +09:00
parent 785f773966
commit 813365e6a8
2 changed files with 41 additions and 2 deletions
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22
imgui-examples/examples/support/mod.rs
View File

@ -1,4 +1,4 @@
use imgui::{ImGui, Ui};
use imgui::{ImGui, ImGuiMouseCursor, Ui};
use std::time::Instant;
#[derive(Copy, Clone, PartialEq, Debug, Default)]
@ -105,6 +105,26 @@ pub fn run<F: FnMut(&Ui) -> bool>(title: String, clear_color: [f32; 4], mut run_
update_mouse(&mut imgui, &mut mouse_state);
let gl_window = display.gl_window();
let mouse_cursor = imgui.mouse_cursor();
if imgui.mouse_draw_cursor() || mouse_cursor == ImGuiMouseCursor::None {
// Hide OS cursor
gl_window.set_cursor_state(glutin::CursorState::Hide).unwrap();
} else {
// Set OS cursor
gl_window.set_cursor_state(glutin::CursorState::Normal).unwrap();
gl_window.set_cursor(match mouse_cursor {
ImGuiMouseCursor::None => unreachable!("mouse_cursor was None!"),
ImGuiMouseCursor::Arrow => glutin::MouseCursor::Arrow,
ImGuiMouseCursor::TextInput => glutin::MouseCursor::Text,
ImGuiMouseCursor::Move => glutin::MouseCursor::Move,
ImGuiMouseCursor::ResizeNS => glutin::MouseCursor::NsResize,
ImGuiMouseCursor::ResizeEW => glutin::MouseCursor::EwResize,
ImGuiMouseCursor::ResizeNESW => glutin::MouseCursor::NeswResize,
ImGuiMouseCursor::ResizeNWSE => glutin::MouseCursor::NwseResize,
});
}
let size_pixels = gl_window.get_inner_size().unwrap();
let hdipi = gl_window.hidpi_factor();
let size_points = (

21
imgui-examples/examples/support_gfx/mod.rs
View File

@ -1,4 +1,4 @@
use imgui::{ImGui, Ui};
use imgui::{ImGui, ImGuiMouseCursor, Ui};
use imgui_gfx_renderer::{Renderer, Shaders};
use std::time::Instant;
@ -131,6 +131,25 @@ pub fn run<F: FnMut(&Ui) -> bool>(title: String, clear_color: [f32; 4], mut run_
update_mouse(&mut imgui, &mut mouse_state);
let mouse_cursor = imgui.mouse_cursor();
if imgui.mouse_draw_cursor() || mouse_cursor == ImGuiMouseCursor::None {
// Hide OS cursor
window.set_cursor_state(glutin::CursorState::Hide).unwrap();
} else {
// Set OS cursor
window.set_cursor_state(glutin::CursorState::Normal).unwrap();
window.set_cursor(match mouse_cursor {
ImGuiMouseCursor::None => unreachable!("mouse_cursor was None!"),
ImGuiMouseCursor::Arrow => glutin::MouseCursor::Arrow,
ImGuiMouseCursor::TextInput => glutin::MouseCursor::Text,
ImGuiMouseCursor::Move => glutin::MouseCursor::Move,
ImGuiMouseCursor::ResizeNS => glutin::MouseCursor::NsResize,
ImGuiMouseCursor::ResizeEW => glutin::MouseCursor::EwResize,
ImGuiMouseCursor::ResizeNESW => glutin::MouseCursor::NeswResize,
ImGuiMouseCursor::ResizeNWSE => glutin::MouseCursor::NwseResize,
});
}
let size_pixels = window.get_inner_size().unwrap();
let hdipi = window.hidpi_factor();
let size_points = (