neovim-gtk/src/popup_menu.rs
2017-07-25 17:55:31 +03:00

271 lines
8.0 KiB
Rust

use std::rc::Rc;
use std::cell::RefCell;
use std::cmp::min;
use gtk;
use gtk::prelude::*;
use glib;
use gdk::{EventButton, EventType};
use neovim_lib::{Neovim, NeovimApi};
use nvim;
use nvim::ErrorReport;
use shell;
use input;
const MAX_VISIBLE_ROWS: i32 = 10;
struct State {
nvim: Option<Rc<RefCell<nvim::NeovimClient>>>,
renderer: gtk::CellRendererText,
tree: gtk::TreeView,
scroll: gtk::ScrolledWindow,
}
impl State {
pub fn new() -> Self {
State {
nvim: None,
renderer: gtk::CellRendererText::new(),
tree: gtk::TreeView::new(),
scroll: gtk::ScrolledWindow::new(None, None),
}
}
fn before_show(&mut self,
shell: &shell::State,
menu_items: &[Vec<&str>],
selected: i64) {
if self.nvim.is_none() {
self.nvim = Some(shell.nvim_clone());
}
self.update_tree(menu_items, shell);
self.select(selected);
}
fn update_tree(&self, menu: &[Vec<&str>], shell: &shell::State) {
if menu.is_empty() {
return;
}
self.renderer
.set_property_font(Some(&shell.get_font_desc().to_string()));
self.renderer.set_property_foreground_rgba(Some(&shell.get_foreground().into()));
self.renderer.set_property_background_rgba(Some(&shell.get_background().into()));
let col_count = menu[0].len();
let columns = self.tree.get_columns();
if columns.len() != col_count {
for col in columns {
self.tree.remove_column(&col);
}
for i in 0..col_count {
self.append_column(i as i32);
}
}
let list_store = gtk::ListStore::new(&vec![gtk::Type::String; col_count]);
let all_column_ids: Vec<u32> = (0..col_count).map(|i| i as u32).collect();
for line in menu {
let line_array: Vec<&glib::ToValue> =
line.iter().map(|v| v as &glib::ToValue).collect();
list_store.insert_with_values(None, &all_column_ids, &line_array[..]);
}
self.tree.set_model(Some(&list_store));
}
fn append_column(&self, id: i32) {
let renderer = &self.renderer;
let column = gtk::TreeViewColumn::new();
column.pack_start(renderer, true);
column.add_attribute(renderer, "text", id);
self.tree.append_column(&column);
}
fn select(&self, selected: i64) {
if selected >= 0 {
let selected_path = gtk::TreePath::new_from_string(&format!("{}", selected));
self.tree.get_selection().select_path(&selected_path);
self.tree
.scroll_to_cell(Some(&selected_path), None, false, 0.0, 0.0);
} else {
self.tree.get_selection().unselect_all();
}
}
fn calc_treeview_height(&self) -> i32 {
let (_, natural_size) = self.renderer.get_preferred_height(&self.tree);
let (_, ypad) = self.renderer.get_padding();
let row_height = natural_size + ypad;
let actual_count = self.tree.get_model().unwrap().iter_n_children(None);
row_height * min(actual_count, MAX_VISIBLE_ROWS) as i32
}
}
pub struct PopupMenu {
popover: gtk::Popover,
open: bool,
state: Rc<RefCell<State>>,
}
impl PopupMenu {
pub fn new(drawing: &gtk::DrawingArea) -> PopupMenu {
let state = State::new();
let popover = gtk::Popover::new(Some(drawing));
popover.set_modal(false);
state.tree.set_headers_visible(false);
state.tree.set_can_focus(false);
state.scroll.set_policy(gtk::PolicyType::Never, gtk::PolicyType::Automatic);
state.scroll.add(&state.tree);
state.scroll.show_all();
popover.add(&state.scroll);
let state = Rc::new(RefCell::new(state));
let state_ref = state.clone();
state.borrow().tree.connect_button_press_event(move |tree, ev| {
let state = state_ref.borrow();
let mut nvim = state.nvim.as_ref().unwrap().borrow_mut();
tree_button_press(tree, ev, &mut *nvim)
});
let state_ref = state.clone();
state.borrow().tree.connect_size_allocate(move |_, _| on_treeview_allocate(state_ref.clone()));
let state_ref = state.clone();
popover.connect_key_press_event(move |_, ev| {
let state = state_ref.borrow();
let mut nvim = state.nvim.as_ref().unwrap().borrow_mut();
input::gtk_key_press(&mut *nvim, ev)
});
PopupMenu {
popover,
state,
open: false,
}
}
pub fn is_open(&self) -> bool {
self.open
}
pub fn show(&mut self,
shell: &shell::State,
menu_items: &[Vec<&str>],
selected: i64,
x: i32,
y: i32,
width: i32,
height: i32) {
self.open = true;
self.popover
.set_pointing_to(&gtk::Rectangle {
x,
y,
width,
height,
});
self.state
.borrow_mut()
.before_show(shell, menu_items, selected);
self.popover.popup()
}
pub fn hide(&mut self) {
self.open = false;
// popdown() in case of fast hide/show
// situation does not work and just close popup window
// so hide() is important here
self.popover.hide();
}
pub fn select(&self, selected: i64) {
self.state.borrow().select(selected);
}
}
fn tree_button_press(tree: &gtk::TreeView, ev: &EventButton, nvim: &mut Neovim) -> Inhibit {
if ev.get_event_type() != EventType::ButtonPress {
return Inhibit(false);
}
let (paths, ..) = tree.get_selection().get_selected_rows();
let selected_idx = if !paths.is_empty() {
let ids = paths[0].get_indices();
if !ids.is_empty() { ids[0] } else { -1 }
} else {
-1
};
let (x, y) = ev.get_position();
if let Some((Some(tree_path), ..)) = tree.get_path_at_pos(x as i32, y as i32) {
let target_idx = tree_path.get_indices()[0];
let scroll_count = find_scroll_count(selected_idx, target_idx);
let mut apply_command = String::new();
for _ in 0..scroll_count {
if target_idx > selected_idx {
apply_command.push_str("<C-n>");
} else {
apply_command.push_str("<C-p>");
}
}
apply_command.push_str("<C-y>");
nvim.input(&apply_command).report_err(nvim);
}
Inhibit(false)
}
fn find_scroll_count(selected_idx: i32, target_idx: i32) -> i32 {
if selected_idx < 0 {
target_idx + 1
} else if target_idx > selected_idx {
target_idx - selected_idx
} else {
selected_idx - target_idx
}
}
fn on_treeview_allocate(state: Rc<RefCell<State>>) {
let treeview_height = state.borrow().calc_treeview_height();
idle_add(move || {
let state = state.borrow();
// strange solution to make gtk assertions happy
let previous_height = state.scroll.get_max_content_height();
if previous_height < treeview_height {
state.scroll.set_max_content_height(treeview_height);
state.scroll.set_min_content_height(treeview_height);
} else if previous_height > treeview_height {
state.scroll.set_min_content_height(treeview_height);
state.scroll.set_max_content_height(treeview_height);
}
Continue(false)
});
}