leftwm-core 0.5.4

A window manager for Adventurers
Documentation 
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use super::{Config, DisplayEvent, Manager, Mode};
use crate::display_action::DisplayAction;
use crate::display_servers::DisplayServer;
use crate::models::{Handle, WindowHandle, WindowState};
use crate::State;

impl<H: Handle, C: Config, SERVER: DisplayServer<H>> Manager<H, C, SERVER> {
    /// Process a collection of events, and apply changes to a manager.
    /// Returns true if changes need to be rendered.
    pub fn display_event_handler(&mut self, event: DisplayEvent<H>) -> bool {
        let state = &mut self.state;
        match event {
            DisplayEvent::ScreenCreate(s) => self.screen_create_handler(s),
            DisplayEvent::WindowCreate(w, x, y) => self.window_created_handler(w, x, y),
            DisplayEvent::WindowChange(w) => self.window_changed_handler(w),
            DisplayEvent::WindowDestroy(handle) => self.window_destroyed_handler(&handle),
            DisplayEvent::SendCommand(command) => self.command_handler(&command),
            DisplayEvent::MouseCombo(mod_mask, button, handle, x, y) => self
                .state
                .mouse_combo_handler(&mod_mask, button, handle, x, y),

            DisplayEvent::WindowTakeFocus(handle) => from_window_take_focus(state, handle),
            DisplayEvent::HandleWindowFocus(handle) => from_handle_window_focus(state, handle),
            DisplayEvent::MoveFocusTo(x, y) => from_move_focus_to(state, x, y),
            DisplayEvent::VerifyFocusedAt(handle) => from_verify_focus_at(state, handle),
            DisplayEvent::ChangeToNormalMode => from_change_to_normal_mode(state),
            DisplayEvent::Movement(handle, x, y) => from_movement(state, handle, x, y),
            DisplayEvent::MoveWindow(handle, x, y) => from_move_window(self, handle, x, y),
            DisplayEvent::ResizeWindow(handle, x, y) => from_resize_window(self, handle, x, y),
            DisplayEvent::ConfigureXlibWindow(handle) => from_configure_xlib_window(state, handle),
        }
    }
}

fn from_window_take_focus<H: Handle>(state: &mut State<H>, handle: WindowHandle<H>) -> bool {
    state.focus_window(&handle);
    false
}

fn from_handle_window_focus<H: Handle>(state: &mut State<H>, handle: WindowHandle<H>) -> bool {
    state.handle_window_focus(&handle);
    false
}

fn from_move_focus_to<H: Handle>(state: &mut State<H>, x: i32, y: i32) -> bool {
    state.focus_window_with_point(x, y);
    false
}

fn from_verify_focus_at<H: Handle>(state: &mut State<H>, handle: WindowHandle<H>) -> bool {
    if state.focus_manager.behaviour.is_sloppy() {
        state.validate_focus_at(&handle);
    }
    false
}

fn from_change_to_normal_mode<H: Handle>(state: &mut State<H>) -> bool {
    match state.mode {
        Mode::MovingWindow(h) | Mode::ResizingWindow(h) => {
            // We want to update the windows tag once it is done moving. This means
            // when the window is re-tiled it is on the correct workspace. This also
            // prevents the focus switching between the floating window and the
            // workspace behind. We will also apply the margin_multiplier here so that
            // it is only called once the window has stopped moving.
            if let Some(window) = state.windows.iter_mut().find(|w| w.handle == h) {
                let loc = window.calculated_xyhw();
                let (center_x, center_y) = loc.center();
                let (margin_multiplier, tag, normal) = if let Some(ws) = state
                    .workspaces
                    .iter()
                    .find(|ws| ws.contains_point(center_x, center_y))
                {
                    (ws.margin_multiplier(), ws.tag, ws.xyhw)
                } else if let Some(ws) = state.workspaces.iter().find(|ws| {
                    let dx =
                        ws.xyhw.x() <= loc.x() + loc.w() && ws.xyhw.x() + ws.xyhw.w() >= loc.x();
                    let dy =
                        ws.xyhw.y() <= loc.y() + loc.h() && ws.xyhw.y() + ws.xyhw.h() >= loc.y();
                    dx && dy
                }) {
                    (ws.margin_multiplier(), ws.tag, ws.xyhw)
                } else {
                    tracing::debug!("No matching workspace found for {:?}", window.handle);
                    (1.0, Some(1), window.normal)
                };
                let mut offset = window.get_floating_offsets().unwrap_or_default();
                // Re-adjust the floating offsets to the new workspace.
                let exact = window.normal + offset;
                offset = exact - normal;
                window.set_floating_offsets(Some(offset));
                window.tag = tag;
                window.apply_margin_multiplier(margin_multiplier);
                let act = DisplayAction::SetWindowTag(window.handle, tag);
                state.actions.push_back(act);
            }
            state.focus_window(&h);
        }
        _ => {}
    }
    state.mode = Mode::Normal;
    true
}

fn from_movement<H: Handle>(state: &mut State<H>, handle: WindowHandle<H>, x: i32, y: i32) -> bool {
    if state.screens.iter().any(|s| s.root == handle) {
        state.focus_workspace_with_point(x, y);
    }
    false
}

// private helper function wrapping `window_move_handler`
// TODO: maybe move to window_move_handler.rs
fn from_move_window<H: Handle, C: Config, SERVER: DisplayServer<H>>(
    manager: &mut Manager<H, C, SERVER>,
    handle: WindowHandle<H>,
    x: i32,
    y: i32,
) -> bool {
    // Setup for when window first moves.
    if let Mode::ReadyToMove(h) = manager.state.mode {
        manager.state.mode = Mode::MovingWindow(h);
        prepare_window(&mut manager.state, h);
    }
    manager.window_move_handler(&handle, x, y)
}

// private helper function wrapping `window_resize_handler`
// TODO: maybe move to window_resize_handler.rs
fn from_resize_window<H: Handle, C: Config, SERVER: DisplayServer<H>>(
    manager: &mut Manager<H, C, SERVER>,
    handle: WindowHandle<H>,
    x: i32,
    y: i32,
) -> bool {
    // Setup for when window first resizes.
    if let Mode::ReadyToResize(h) = manager.state.mode {
        manager.state.mode = Mode::ResizingWindow(h);
        prepare_window(&mut manager.state, h);
    }
    manager.window_resize_handler(&handle, x, y)
}

// called when manager receives `DisplayAction::ConfigureXlibWindow(handle)`
// then sends back a copy of the event if the state already knows about it.
fn from_configure_xlib_window<H: Handle>(state: &mut State<H>, handle: WindowHandle<H>) -> bool {
    if let Some(window) = state.windows.iter().find(|w| w.handle == handle) {
        let act = DisplayAction::ConfigureXlibWindow(window.clone());
        state.actions.push_back(act);
    }
    false
}

// Save off the info about position of the window when we start to move/resize.
fn prepare_window<H: Handle>(state: &mut State<H>, handle: WindowHandle<H>) {
    if let Some(w) = state.windows.iter_mut().find(|w| w.handle == handle) {
        // Un-pin window if maximized or in fullscreen
        if w.is_fullscreen() {
            w.reset_float_offset();
            state.actions.push_back(DisplayAction::SetState(
                handle,
                false,
                WindowState::Fullscreen,
            ));
            w.states.retain(|s| s != &WindowState::Fullscreen);
            // Force update for all windows
            state.mode = Mode::ReadyToResize(handle);
        }
        if w.is_maximized() {
            w.reset_float_offset();
            state.actions.push_back(DisplayAction::SetState(
                handle,
                false,
                WindowState::Maximized,
            ));
            w.states.retain(|s| s != &WindowState::Maximized);
            w.states.retain(|s| s != &WindowState::MaximizedHorz);
            w.states.retain(|s| s != &WindowState::MaximizedVert);
            // Force update for all windows
            state.mode = Mode::ReadyToResize(handle);
        }
        if w.floating() {
            let offset = w.get_floating_offsets().unwrap_or_default();
            w.start_loc = Some(offset);
        } else {
            let container = w.container_size.unwrap_or_default();
            let normal = w.normal;
            let floating = normal - container;
            w.set_floating_offsets(Some(floating));
            w.start_loc = Some(floating);
            w.set_floating(true);
            // Force update for all windows
            state.mode = Mode::ReadyToResize(handle);
        }
    }
    state.move_to_top(&handle);
}