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use {
super::*,
crate::{
app::*,
command::{Command, ScrollCommand, TriggerType},
display::{CropWriter, LONG_SPACE, Screen, W},
errors::ProgramError,
flag::Flag,
pattern::{InputPattern, Pattern},
selection_type::SelectionType,
skin::PanelSkin,
verb::*,
},
crossterm::{
cursor,
QueueableCommand,
},
std::path::{Path, PathBuf},
termimad::{Area},
};
/// an application state dedicated to previewing files
pub struct PreviewState {
pub preview_area: Area,
dirty: bool, // background must be cleared
file_name: String,
path: PathBuf, // path to the previewed file
preview: Preview,
filtered_preview: Option<Preview>,
}
impl PreviewState {
pub fn new(path: PathBuf, _con: &AppContext) -> PreviewState {
let preview_area = Area::uninitialized(); // will be fixed at drawing time
let preview = Preview::new(&path, Pattern::None);
let file_name = path.file_name()
.map(|n| n.to_string_lossy().to_string())
.unwrap_or_else(|| "???".to_string());
PreviewState {
preview_area,
dirty: true,
file_name,
path,
preview,
filtered_preview: None,
}
}
fn mut_preview(&mut self) -> &mut Preview {
self.filtered_preview.as_mut().unwrap_or(&mut self.preview)
}
}
impl AppState for PreviewState {
fn selected_path(&self) -> &Path {
&self.path
}
fn set_selected_path(&mut self, path: PathBuf) {
// this is only called when the path really changed
self.preview = Preview::new(&path, Pattern::None); // TODO keep the pattern ?
self.file_name = path.file_name()
.map(|n| n.to_string_lossy().to_string())
.unwrap_or_else(|| "???".to_string());
self.path = path;
}
fn selection_type(&self) -> SelectionType {
SelectionType::File
}
fn refresh(&mut self, _screen: &Screen, _con: &AppContext) -> Command {
self.dirty = true;
self.set_selected_path(self.path.clone());
Command::empty()
}
fn on_pattern(
&mut self,
pat: InputPattern,
_con: &AppContext,
) -> Result<AppStateCmdResult, ProgramError> {
debug!("preview pattern: {:?}", &pat);
if pat.is_some() {
if !self.preview.is_filterable() {
return Ok(AppStateCmdResult::DisplayError(
"this preview can't be searched".to_string()
));
}
self.filtered_preview = Some(Preview::new(&self.path, pat.pattern));
} else {
self.filtered_preview = None;
}
Ok(AppStateCmdResult::Keep)
}
fn display(
&mut self,
w: &mut W,
screen: &Screen,
state_area: Area,
panel_skin: &PanelSkin,
_con: &AppContext,
) -> Result<(), ProgramError> {
if state_area.height < 3 {
warn!("area too small for preview");
return Ok(());
}
let mut preview_area = state_area.clone();
preview_area.height -= 1;
preview_area.top += 1;
if preview_area != self.preview_area {
self.dirty = true;
self.preview_area = preview_area;
}
if self.dirty {
panel_skin.styles.default.queue_bg(w)?;
screen.clear_area_to_right(w, &state_area)?;
self.dirty = false;
}
let styles = &panel_skin.styles;
w.queue(cursor::MoveTo(state_area.left, 0))?;
let mut cw = CropWriter::new(w, state_area.width as usize);
cw.queue_str(&styles.default, &self.file_name)?;
cw.fill(&styles.default, LONG_SPACE)?;
self.filtered_preview.as_mut().unwrap_or(&mut self.preview)
.display(w, screen, panel_skin, &self.preview_area)
}
fn get_status(
&self,
cmd: &Command,
other_path: &Option<PathBuf>,
con: &AppContext,
) -> Status {
match cmd {
Command::VerbEdit(invocation) => {
if invocation.name.is_empty() {
Status::from_message(
"Type a verb then *enter* to execute it (*?* for the list of verbs)",
)
} else {
match con.verb_store.search(&invocation.name) {
PrefixSearchResult::NoMatch => Status::from_error("No matching verb"),
PrefixSearchResult::Match(_, verb) => {
verb.get_status(&self.path, other_path, invocation)
}
PrefixSearchResult::Matches(completions) => {
Status::from_message(format!(
"Possible completions: {}",
completions
.iter()
.map(|c| format!("*{}*", c))
.collect::<Vec<String>>()
.join(", "),
))
}
}
}
}
_ => Status::from_message(
"Hit *esc* to get back to the tree, or a space to start a verb",
),
}
}
fn on_internal(
&mut self,
w: &mut W,
internal_exec: &InternalExecution,
input_invocation: Option<&VerbInvocation>,
trigger_type: TriggerType,
cc: &CmdContext,
screen: &mut Screen,
) -> Result<AppStateCmdResult, ProgramError> {
match internal_exec.internal {
Internal::line_down => {
self.mut_preview().try_scroll(ScrollCommand::Lines(1));
Ok(AppStateCmdResult::Keep)
}
Internal::line_up => {
self.mut_preview().try_scroll(ScrollCommand::Lines(-1));
Ok(AppStateCmdResult::Keep)
}
Internal::page_down => {
self.mut_preview().try_scroll(ScrollCommand::Pages(1));
Ok(AppStateCmdResult::Keep)
}
Internal::page_up => {
self.mut_preview().try_scroll(ScrollCommand::Pages(-1));
Ok(AppStateCmdResult::Keep)
}
_ => self.on_internal_generic(
w,
internal_exec,
input_invocation,
trigger_type,
cc,
screen,
),
}
}
// TODO put the hex/txt view here
fn get_flags(&self) -> Vec<Flag> {
vec![]
}
}
|
