x11: split event loop and XCB event handling into separate fns
This commit is contained in:
William Light
parent
23af18020e
commit
54f8bc7345
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@ -12,6 +12,10 @@ pub struct Window {
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scaling: f64,
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}
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// FIXME: move to outer crate context
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pub struct WindowHandle;
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impl Window {
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pub fn open<H: WindowHandler>(options: WindowOpenOptions) -> WindowHandle {
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// Convert the parent to a X11 window ID if we're given one
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@ -101,10 +105,115 @@ impl Window {
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let mut handler = H::build(&mut window);
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run_event_loop(&mut window, &mut handler);
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window.run_event_loop(&mut handler);
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WindowHandle
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}
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// Event loop
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fn run_event_loop<H: WindowHandler>(&mut self, handler: &mut H) {
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loop {
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let ev = self.xcb_connection.conn.wait_for_event();
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if let Some(event) = ev {
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self.handle_xcb_event(handler, event);
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}
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}
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}
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fn handle_xcb_event<H: WindowHandler>(&mut self, handler: &mut H, event: xcb::GenericEvent) {
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let event_type = event.response_type() & !0x80;
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// For all of the keyboard and mouse events, you can fetch
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// `x`, `y`, `detail`, and `state`.
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// - `x` and `y` are the position inside the window where the cursor currently is
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// when the event happened.
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// - `detail` will tell you which keycode was pressed/released (for keyboard events)
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// or which mouse button was pressed/released (for mouse events).
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// For mouse events, here's what the value means (at least on my current mouse):
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// 1 = left mouse button
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// 2 = middle mouse button (scroll wheel)
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// 3 = right mouse button
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// 4 = scroll wheel up
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// 5 = scroll wheel down
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// 8 = lower side button ("back" button)
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// 9 = upper side button ("forward" button)
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// Note that you *will* get a "button released" event for even the scroll wheel
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// events, which you can probably ignore.
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// - `state` will tell you the state of the main three mouse buttons and some of
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// the keyboard modifier keys at the time of the event.
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// http://rtbo.github.io/rust-xcb/src/xcb/ffi/xproto.rs.html#445
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match event_type {
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xcb::EXPOSE => {
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handler.draw(self);
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}
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xcb::MOTION_NOTIFY => {
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let event = unsafe { xcb::cast_event::<xcb::MotionNotifyEvent>(&event) };
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let detail = event.detail();
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if detail != 4 && detail != 5 {
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handler.on_event(
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self,
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Event::CursorMotion(event.event_x() as i32, event.event_y() as i32),
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);
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}
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}
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xcb::BUTTON_PRESS => {
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let event = unsafe { xcb::cast_event::<xcb::ButtonPressEvent>(&event) };
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let detail = event.detail();
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match detail {
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4 => {
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handler.on_event(
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self,
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Event::MouseScroll(MouseScroll {
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x_delta: 0.0,
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y_delta: 1.0,
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}),
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);
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}
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5 => {
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handler.on_event(
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self,
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Event::MouseScroll(MouseScroll {
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x_delta: 0.0,
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y_delta: -1.0,
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}),
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);
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}
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detail => {
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let button_id = mouse_id(detail);
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handler.on_event(self, Event::MouseDown(button_id));
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}
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}
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}
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xcb::BUTTON_RELEASE => {
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let event = unsafe { xcb::cast_event::<xcb::ButtonPressEvent>(&event) };
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let detail = event.detail();
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if detail != 4 && detail != 5 {
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let button_id = mouse_id(detail);
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handler.on_event(self, Event::MouseUp(button_id));
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}
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}
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xcb::KEY_PRESS => {
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let event = unsafe { xcb::cast_event::<xcb::KeyPressEvent>(&event) };
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let detail = event.detail();
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handler.on_event(self, Event::KeyDown(detail));
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}
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xcb::KEY_RELEASE => {
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let event = unsafe { xcb::cast_event::<xcb::KeyReleaseEvent>(&event) };
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let detail = event.detail();
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handler.on_event(self, Event::KeyUp(detail));
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}
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_ => {
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println!("Unhandled event type: {:?}", event_type);
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}
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}
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}
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}
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unsafe impl HasRawWindowHandle for Window {
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@ -117,108 +226,6 @@ unsafe impl HasRawWindowHandle for Window {
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}
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}
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pub struct WindowHandle;
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// Event loop
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fn run_event_loop<H: WindowHandler>(window: &mut Window, handler: &mut H) {
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loop {
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let ev = window.xcb_connection.conn.wait_for_event();
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if let Some(event) = ev {
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let event_type = event.response_type() & !0x80;
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// For all of the keyboard and mouse events, you can fetch
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// `x`, `y`, `detail`, and `state`.
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// - `x` and `y` are the position inside the window where the cursor currently is
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// when the event happened.
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// - `detail` will tell you which keycode was pressed/released (for keyboard events)
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// or which mouse button was pressed/released (for mouse events).
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// For mouse events, here's what the value means (at least on my current mouse):
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// 1 = left mouse button
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// 2 = middle mouse button (scroll wheel)
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// 3 = right mouse button
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// 4 = scroll wheel up
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// 5 = scroll wheel down
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// 8 = lower side button ("back" button)
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// 9 = upper side button ("forward" button)
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// Note that you *will* get a "button released" event for even the scroll wheel
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// events, which you can probably ignore.
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// - `state` will tell you the state of the main three mouse buttons and some of
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// the keyboard modifier keys at the time of the event.
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// http://rtbo.github.io/rust-xcb/src/xcb/ffi/xproto.rs.html#445
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match event_type {
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xcb::EXPOSE => {
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handler.draw(window);
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}
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xcb::MOTION_NOTIFY => {
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let event = unsafe { xcb::cast_event::<xcb::MotionNotifyEvent>(&event) };
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let detail = event.detail();
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if detail != 4 && detail != 5 {
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handler.on_event(
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window,
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Event::CursorMotion(event.event_x() as i32, event.event_y() as i32),
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);
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}
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}
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xcb::BUTTON_PRESS => {
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let event = unsafe { xcb::cast_event::<xcb::ButtonPressEvent>(&event) };
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let detail = event.detail();
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match detail {
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4 => {
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handler.on_event(
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window,
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Event::MouseScroll(MouseScroll {
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x_delta: 0.0,
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y_delta: 1.0,
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}),
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);
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}
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5 => {
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handler.on_event(
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window,
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Event::MouseScroll(MouseScroll {
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x_delta: 0.0,
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y_delta: -1.0,
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}),
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);
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}
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detail => {
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let button_id = mouse_id(detail);
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handler.on_event(window, Event::MouseDown(button_id));
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}
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}
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}
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xcb::BUTTON_RELEASE => {
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let event = unsafe { xcb::cast_event::<xcb::ButtonPressEvent>(&event) };
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let detail = event.detail();
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if detail != 4 && detail != 5 {
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let button_id = mouse_id(detail);
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handler.on_event(window, Event::MouseUp(button_id));
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}
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}
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xcb::KEY_PRESS => {
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let event = unsafe { xcb::cast_event::<xcb::KeyPressEvent>(&event) };
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let detail = event.detail();
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handler.on_event(window, Event::KeyDown(detail));
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}
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xcb::KEY_RELEASE => {
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let event = unsafe { xcb::cast_event::<xcb::KeyReleaseEvent>(&event) };
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let detail = event.detail();
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handler.on_event(window, Event::KeyUp(detail));
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}
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_ => {
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println!("Unhandled event type: {:?}", event_type);
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}
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}
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}
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}
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}
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// Try to get the scaling with this function first.
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// If this gives you `None`, fall back to `get_scaling_screen_dimensions`.
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// If neither work, I guess just assume 96.0 and don't do any scaling.
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