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Implemented roster scrolling.

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This commit is contained in:
shy 2021-04-17 13:03:12 +02:00
parent a79cd5d566
commit b10886508c
2 changed files with 94 additions and 50 deletions
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133
src/alarm.rs
View file

@ -37,10 +37,6 @@ impl Countdown {
self.value = value;
}
pub fn set_position(&mut self, position: Position) {
self.position = Some(position);
}
pub fn has_position(&self) -> bool {
self.position.is_some()
}
@ -74,6 +70,40 @@ impl Countdown {
}
Ok(())
}
pub fn place(
&mut self,
layout: &Layout,
alarm: &Alarm,
offset: usize,
index: usize,
) {
// Compute position.
let mut col =
layout.roster.col
+ 3
+ UnicodeWidthStr::width(alarm.label.as_str()) as u16;
let mut line = layout.roster.line + index as u16;
// Compensate for "hidden" items in the alarm roster.
if offset > 0 {
if index <= offset {
// Draw next to upper placeholder.
line = layout.roster.line;
col = layout.roster.col + 6;
} else {
// Should be no problem as index > offset and
// line is x + index.
line -= offset as u16;
}
}
if line > layout.roster_height.saturating_add(2) {
// Draw next to lower placeholder.
line = layout.roster.line + layout.roster_height;
col = layout.roster.col + 6;
}
self.position = Some(Position { col, line });
}
}
pub struct Alarm {
@ -91,12 +121,14 @@ impl Alarm {
pub struct AlarmRoster {
list: Vec<Alarm>,
offset: usize,
}
impl AlarmRoster {
pub fn new() -> AlarmRoster {
AlarmRoster {
list: Vec::new(),
offset: 0,
}
}
@ -170,8 +202,13 @@ impl AlarmRoster {
}
// Remove last alarm.
pub fn drop_last(&mut self) -> bool {
self.list.pop().is_some()
pub fn pop(&mut self) -> Option<Alarm> {
self.list.pop()
}
// Offset ceiling according to layout information.
fn adjust_offset(&mut self, layout: &Layout) {
self.offset = self.offset.min(self.list.len().saturating_sub(layout.roster_height as usize));
}
// Check for active alarms.
@ -179,6 +216,16 @@ impl AlarmRoster {
!self.list.iter().any(|a| !a.exceeded)
}
pub fn scroll_up(&mut self, layout: &Layout) {
let excess = self.list.len().saturating_sub(layout.roster_height as usize);
self.offset = excess.min(self.offset.saturating_sub(1));
}
pub fn scroll_down(&mut self, layout: &Layout) {
let excess = self.list.len().saturating_sub(layout.roster_height as usize);
self.offset = excess.min(self.offset.saturating_add(1));
}
// Find and process exceeded alarms.
pub fn check(&mut self,
clock: &mut Clock,
@ -188,7 +235,6 @@ impl AlarmRoster {
) -> Option<&Alarm>
{
let mut ret = None;
let size = self.list.len() as u16;
for (index, alarm) in self.list.iter_mut()
.enumerate()
@ -207,26 +253,7 @@ impl AlarmRoster {
// Reached the alarm to exceed next. Update countdown accordingly.
countdown.set(alarm.time - clock.elapsed);
if !countdown.has_position() || force_redraw {
// Compute position.
let mut col =
layout.roster.col
+ 3
+ UnicodeWidthStr::width(alarm.label.as_str()) as u16;
let mut line = layout.roster.line + index as u16;
// Compensate for "hidden" items in the alarm roster.
// TODO: Make this more elegant and robust.
if let Some(offset) = size.checked_sub(layout.roster_height + 1) {
if index as u16 <= offset{
// Draw next to placeholder ("[...]").
line = layout.roster.line;
col = layout.roster.col + 6;
} else {
line = line.checked_sub(offset)
.unwrap_or(layout.roster.line);
}
}
countdown.set_position(Position { col, line });
countdown.place(&layout, &alarm, self.offset, index);
}
// Ignore other alarms.
break;
@ -236,35 +263,43 @@ impl AlarmRoster {
// Draw alarm roster according to layout.
pub fn draw<W: Write>(
&self,
&mut self,
stdout: &mut RawTerminal<W>,
layout: &mut Layout,
config: &Config,
) -> Result<(), std::io::Error>
{
// Find first item to print in case we lack the space to print them
// all. Final '-1' to take account for the input buffer.
let mut offset = 0;
// Match offset to layout.
self.adjust_offset(&layout);
if self.list.len() > layout.roster_height as usize {
// Actually -1 (zero indexing) +1 (first line containing "[...]").
offset = self.list.len() - layout.roster_height as usize;
for (i, alarm) in self.list.iter()
.skip(self.offset)
.enumerate()
{
// Add 1 to compensate for the line "[...]".
let line = layout.roster.line + i as u16;
write!(stdout,
"{}{}[...]{}",
cursor::Goto(layout.roster.col, layout.roster.line),
style::Faint,
style::Reset,
)?;
}
for (i, alarm) in self.list.iter().skip(offset).enumerate() {
let line = if offset > 0 {
// Add offset of one for "[...]".
layout.roster.line + i as u16 + 1
} else {
layout.roster.line + i as u16
};
if self.offset > 0 && i == 0 {
// Indicate hidden items at top.
write!(stdout,
"{}{}{}{}",
cursor::Goto(layout.roster.col, line),
style::Faint,
if config.fancy { "╶╴▲╶╴" } else { "[ ^ ]" },
style::Reset,
)?;
continue;
} else if i == layout.roster_height as usize {
// Indicate hidden items at bottom.
write!(stdout,
"{}{}{}{}",
cursor::Goto(layout.roster.col, line),
style::Faint,
if config.fancy { "╶╴▼╶╴" } else { "[ v ]" },
style::Reset,
)?;
break;
}
match alarm.exceeded {
true if config.fancy => {

11
src/lib.rs
View file

@ -274,6 +274,15 @@ pub fn run(
layout.schedule_recalc();
force_redraw = true;
},
// Scroll alarm roster.
Key::PageUp => {
alarm_roster.scroll_up(&layout);
force_redraw = true;
},
Key::PageDown => {
alarm_roster.scroll_down(&layout);
force_redraw = true;
},
// Forward every char if in insert mode.
Key::Char(c) if buffer.visible => {
buffer.push(c);
@ -297,7 +306,7 @@ pub fn run(
},
// Delete last alarm on 'd'.
Key::Char('d') => {
if alarm_roster.drop_last() {
if alarm_roster.pop().is_some() {
// If we remove the last alarm we have to reset "countdown"
// manually. It is safe to do it anyway.
layout.set_roster_width(alarm_roster.width());