elias/imgui-rs
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[imgui-glutin-support] Allow to set app's HIDPI factor

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This commit is contained in:
Malik Olivier Boussejra 2018-10-09 19:49:34 +09:00
parent 19ab82e521
commit 378447e380
1 changed files with 53 additions and 11 deletions
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64
imgui-glutin-support/src/lib.rs
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@ -27,10 +27,17 @@
//! # fn main() {
//! # let mut events_loop = EventsLoop::new();
//! # let mut imgui = ImGui::init();
//! # let window_hidpi_factor = 1.0;
//! # let app_hidpi_factor = 1.0;
//! events_loop.poll_events(|event| {
//! // do application-specific stuff with event
//!
//! imgui_glutin_support::handle_event(&mut imgui, &event);
//! imgui_glutin_support::handle_event(
//! &mut imgui,
//! &event,
//! window_hidpi_factor,
//! app_hidpi_factor
//! );
//! });
//! # }
//! ```
@ -51,11 +58,18 @@
//! # fn main() {
//! # let mut events_loop = EventsLoop::new();
//! # let mut imgui = ImGui::init();
//! # let window_hidpi_factor = 1.0;
//! # let app_hidpi_factor = 1.0;
//! events_loop.poll_events(|event| {
//! // do application-specific stuff with event
//!
//! // default handling for events
//! imgui_glutin_support::handle_event(&mut imgui, &event);
//! imgui_glutin_support::handle_event(
//! &mut imgui,
//! &event,
//! window_hidpi_factor,
//! app_hidpi_factor
//! );
//!
//! // Scroll 10 times the pixels per line by handling LineDelta events again and
//! // overriding the mouse wheel value
@ -132,10 +146,20 @@ pub fn handle_modifiers(imgui: &mut ImGui, modifiers: ModifiersState) {
}
/// Update imgui mouse wheel position
pub fn handle_mouse_scroll_delta(imgui: &mut ImGui, delta: MouseScrollDelta) {
pub fn handle_mouse_scroll_delta(
imgui: &mut ImGui,
delta: MouseScrollDelta,
window_hidpi_factor: f64,
app_hidpi_factor: f64,
) {
match delta {
MouseScrollDelta::LineDelta(_, y) => imgui.set_mouse_wheel(y),
MouseScrollDelta::PixelDelta(pos) => imgui.set_mouse_wheel(pos.y as f32),
MouseScrollDelta::PixelDelta(pos) => {
let pos = pos
.to_physical(window_hidpi_factor)
.to_logical(app_hidpi_factor);
imgui.set_mouse_wheel(pos.y as f32)
}
}
}
@ -154,15 +178,27 @@ pub fn handle_mouse_button_state(imgui: &mut ImGui, button: MouseButton, state:
}
/// Update imgui state from glutin event
pub fn handle_event(imgui: &mut ImGui, event: &Event) {
pub fn handle_event(
imgui: &mut ImGui,
event: &Event,
window_hidpi_factor: f64,
app_hidpi_factor: f64,
) {
match event {
&Event::WindowEvent { ref event, .. } => handle_window_event(imgui, event),
&Event::WindowEvent { ref event, .. } => {
handle_window_event(imgui, event, window_hidpi_factor, app_hidpi_factor)
}
_ => (),
}
}
/// Update imgui state from glutin window event
pub fn handle_window_event(imgui: &mut ImGui, event: &WindowEvent) {
pub fn handle_window_event(
imgui: &mut ImGui,
event: &WindowEvent,
window_hidpi_factor: f64,
app_hidpi_factor: f64,
) {
use WindowEvent::*;
match event {
&KeyboardInput { input, .. } => handle_keyboard_input(imgui, input),
@ -172,6 +208,9 @@ pub fn handle_window_event(imgui: &mut ImGui, event: &WindowEvent) {
modifiers,
..
} => {
let position = position
.to_physical(window_hidpi_factor)
.to_logical(app_hidpi_factor);
imgui.set_mouse_pos(position.x as f32, position.y as f32);
handle_modifiers(imgui, modifiers);
}
@ -181,7 +220,7 @@ pub fn handle_window_event(imgui: &mut ImGui, event: &WindowEvent) {
phase: TouchPhase::Moved,
..
} => {
handle_mouse_scroll_delta(imgui, delta);
handle_mouse_scroll_delta(imgui, delta, window_hidpi_factor, app_hidpi_factor);
handle_modifiers(imgui, modifiers);
}
&MouseInput {
@ -223,9 +262,12 @@ pub fn update_mouse_cursor(imgui: &ImGui, window: &Window) {
/// Get the current frame size for imgui frame rendering.
///
/// Returns `None` if the window no longer exists
pub fn get_frame_size(window: &Window) -> Option<FrameSize> {
pub fn get_frame_size(window: &Window, app_hidpi_factor: f64) -> Option<FrameSize> {
window.get_inner_size().map(|logical_size| FrameSize {
logical_size: logical_size.into(),
hidpi_factor: window.get_hidpi_factor(),
logical_size: logical_size
.to_physical(window.get_hidpi_factor())
.to_logical(app_hidpi_factor)
.into(),
hidpi_factor: app_hidpi_factor,
})
}