mirror of
https://github.com/FliegendeWurst/cursive.git
synced 2024-11-09 19:00:46 +00:00
More safe subtractions all around.
This commit is contained in:
parent
14161f51e4
commit
05bac7a192
@ -167,6 +167,7 @@ impl<'a> Printer<'a> {
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let start = start.into();
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let size = size.into();
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if size.x < 2 || size.y < 2 {
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return;
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}
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@ -247,8 +248,8 @@ impl<'a> Printer<'a> {
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pub fn print_hdelim<T: Into<Vec2>>(&self, start: T, len: usize) {
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let start = start.into();
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self.print(start, "├");
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self.print_hline(start + (1, 0), len - 2, "─");
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self.print(start + (len - 1, 0), "┤");
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self.print_hline(start + (1, 0), len.saturating_sub(2), "─");
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self.print(start + (len.saturating_sub(1), 0), "┤");
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}
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/// Returns a printer on a subset of this one's area.
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@ -257,10 +258,15 @@ impl<'a> Printer<'a> {
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-> Printer<'a> {
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let size = size.into();
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let offset = offset.into().or_min(self.size);
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let available = if !offset.fits_in(self.size) {
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Vec2::zero()
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} else {
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Vec2::min(self.size - offset, size)
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};
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Printer {
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offset: self.offset + offset,
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// We can't be larger than what remains
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size: Vec2::min(self.size - offset, size),
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size: available,
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focused: self.focused && focused,
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theme: self.theme,
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backend: self.backend,
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42
src/vec.rs
42
src/vec.rs
@ -30,15 +30,57 @@ impl PartialOrd for XY<usize> {
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}
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}
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impl XY<usize> {
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/// Saturating subtraction. Computes `self - other`, saturating at 0.
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///
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/// Never panics.
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pub fn saturating_sub<O: Into<Self>>(&self, other: O) -> Self {
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let other = other.into();
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Self::new(self.x.saturating_sub(other.x),
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self.y.saturating_sub(other.y))
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}
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/// Checked subtraction. Computes `self - other` if possible.
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///
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/// Returns `None` if `self.x < other.x || self.y < other.y`.
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///
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/// Never panics.
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pub fn checked_sub<O: Into<Self>>(&self, other: O) -> Option<Self> {
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let other = other.into();
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if self.fits(other) {
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Some(*self - other)
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} else {
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None
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}
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}
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/// Returns a `XY<isize>` from `self`.
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pub fn signed(self) -> XY<isize> {
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self.into()
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}
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}
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impl<T: Ord> XY<T> {
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/// Returns `true` if `self` could fit inside `other`.
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///
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/// Shortcut for `self.x <= other.x && self.y <= other.y`.
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///
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/// If this returns `true`, then `other - self` will not underflow.
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pub fn fits_in<O: Into<Self>>(&self, other: O) -> bool {
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let other = other.into();
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self.x <= other.x && self.y <= other.y
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}
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/// Returns `true` if `other` could fit inside `self`.
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///
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/// Shortcut for `self.x >= other.x && self.y >= other.y`.
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///
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/// If this returns `true`, then `self - other` will not underflow.
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pub fn fits<O: Into<Self>>(&self, other: O) -> bool {
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let other = other.into();
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self.x >= other.x && self.y >= other.y
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}
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/// Returns a new Vec2 that is a maximum per coordinate.
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pub fn max<A: Into<XY<T>>, B: Into<XY<T>>>(a: A, b: B) -> Self {
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let a = a.into();
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@ -177,14 +177,12 @@ impl ScrollBase {
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let max_y = min(self.view_height,
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self.content_height - self.start_line);
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let w = if self.scrollable() {
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if printer.size.x < 2 {
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return;
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}
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// We have to remove the bar width and the padding.
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printer.size.x - 1 - self.right_padding
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printer.size.x.saturating_sub(1 + self.right_padding)
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} else {
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printer.size.x
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};
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for y in 0..max_y {
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// Y is the actual coordinate of the line.
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// The item ID is then Y + self.start_line
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@ -218,7 +216,7 @@ impl ScrollBase {
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};
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// TODO: use 1 instead of 2
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let scrollbar_x = printer.size.x - 1 - self.scrollbar_offset;
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let scrollbar_x = printer.size.x.saturating_sub(1 + self.scrollbar_offset);
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printer.print_vline((scrollbar_x, 0), printer.size.y, "|");
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printer.with_color(color, |printer| {
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printer.print_vline((scrollbar_x, start), height, "▒");
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@ -179,28 +179,26 @@ impl View for Dialog {
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// Current horizontal position of the next button we'll draw.
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// Sum of the sizes + len-1 for margins
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let width = if self.buttons.is_empty() {
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0
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} else {
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self.buttons
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.iter()
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.map(|button| button.size.x)
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.fold(0, |a, b| a + b) + self.buttons.len() - 1
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};
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let width = self.buttons
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.iter()
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.map(|button| button.size.x)
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.fold(0, |a, b| a + b) +
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self.buttons.len().saturating_sub(1);
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let overhead = self.padding + self.borders;
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if printer.size.x < overhead.horizontal() {
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return;
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}
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let mut offset = overhead.left +
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self.align
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.h
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.get_offset(width, printer.size.x - overhead.horizontal());
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self.align.h.get_offset(width,
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printer.size.x -
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overhead.horizontal());
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let overhead_bottom = self.padding.bottom + self.borders.bottom + 1;
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if overhead_bottom > printer.size.y {
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return;
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}
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let y = printer.size.y - overhead_bottom;
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let y = match printer.size.y.checked_sub(overhead_bottom) {
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Some(y) => y,
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None => return,
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};
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for (i, button) in self.buttons.iter().enumerate() {
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let size = button.size;
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@ -217,16 +215,16 @@ impl View for Dialog {
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// What do we have left?
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let taken = Vec2::new(0, buttons_height) + self.borders.combined() +
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self.padding.combined();
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if !taken.fits_in(printer.size) {
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return;
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}
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let inner_size = printer.size - taken;
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self.content
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.draw(&printer.sub_printer(self.borders.top_left() +
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self.padding.top_left(),
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inner_size,
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self.focus == Focus::Content));
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let inner_size = match printer.size.checked_sub(taken) {
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Some(s) => s,
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None => return,
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};
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self.content.draw(&printer.sub_printer(self.borders.top_left() +
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self.padding.top_left(),
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inner_size,
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self.focus == Focus::Content));
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printer.print_box(Vec2::new(0, 0), printer.size, false);
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@ -253,9 +251,10 @@ impl View for Dialog {
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// Buttons are not flexible, so their size doesn't depend on ours.
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let mut buttons_size = Vec2::new(0, 0);
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if !self.buttons.is_empty() {
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buttons_size.x += self.buttons.len() - 1;
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}
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// Start with the inter-button space.
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buttons_size.x += self.buttons.len().saturating_sub(1);
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for button in &mut self.buttons {
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let s = button.view.required_size(req);
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buttons_size.x += s.x;
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@ -264,11 +263,12 @@ impl View for Dialog {
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// We also remove one row for the buttons.
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let taken = nomans_land + Vec2::new(0, buttons_size.y);
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if !taken.fits_in(req) {
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let content_req = match req.checked_sub(taken) {
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Some(r) => r,
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// Bad!!
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return taken;
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}
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let content_req = req - taken;
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None => return taken,
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};
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let content_size = self.content.required_size(content_req);
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@ -291,11 +291,7 @@ impl View for Dialog {
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// Padding and borders are taken, sorry.
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// TODO: handle border-less themes?
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let taken = self.borders.combined() + self.padding.combined();
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size = if taken.fits_in(size) {
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size - taken
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} else {
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Vec2::zero()
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};
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size = size.saturating_sub(taken);
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// Buttons are kings, we give them everything they want.
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let mut buttons_height = 0;
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@ -309,7 +305,7 @@ impl View for Dialog {
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if buttons_height > size.y {
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buttons_height = size.y;
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}
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self.content.layout(size - Vec2::new(0, buttons_height));
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self.content.layout(size.saturating_sub((0, buttons_height)));
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}
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fn on_event(&mut self, event: Event) -> EventResult {
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@ -339,8 +335,7 @@ impl View for Dialog {
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match event {
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// Up goes back to the content
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Event::Key(Key::Up) => {
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if self.content
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.take_focus(Direction::down()) {
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if self.content.take_focus(Direction::down()) {
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self.focus = Focus::Content;
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EventResult::Consumed(None)
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} else {
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@ -348,8 +343,7 @@ impl View for Dialog {
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}
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}
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Event::Shift(Key::Tab) => {
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if self.content
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.take_focus(Direction::back()) {
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if self.content.take_focus(Direction::back()) {
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self.focus = Focus::Content;
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EventResult::Consumed(None)
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} else {
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@ -358,7 +352,7 @@ impl View for Dialog {
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}
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Event::Key(Key::Tab) => {
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if self.content
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.take_focus(Direction::front()) {
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.take_focus(Direction::front()) {
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self.focus = Focus::Content;
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EventResult::Consumed(None)
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} else {
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@ -367,8 +361,7 @@ impl View for Dialog {
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}
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// Left and Right move to other buttons
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Event::Key(Key::Right) if i + 1 <
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self.buttons
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.len() => {
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self.buttons.len() => {
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self.focus = Focus::Button(i + 1);
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EventResult::Consumed(None)
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}
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@ -400,7 +393,7 @@ impl View for Dialog {
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}
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fn call_on_any<'a>(&mut self, selector: &Selector,
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callback: Box<FnMut(&mut Any) + 'a>) {
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callback: Box<FnMut(&mut Any) + 'a>) {
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self.content.call_on_any(selector, callback);
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}
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@ -370,13 +370,14 @@ impl EditView {
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.map(|g| g.width())
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.next()
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.unwrap_or(1);
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if c_len > self.last_length {
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// Weird - no available space?
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return;
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}
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// Now, we have to fit self.content[..self.cursor]
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// into self.last_length - c_len.
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let available = self.last_length - c_len;
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let available = match self.last_length.checked_sub(c_len) {
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Some(s) => s,
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// Weird - no available space?
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None => return,
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};
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// Look at the content before the cursor (we will print its tail).
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// From the end, count the length until we reach `available`.
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// Then sum the byte lengths.
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@ -384,6 +385,8 @@ impl EditView {
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self.cursor],
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available)
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.length;
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assert!(suffix_length <= self.cursor);
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self.offset = self.cursor - suffix_length;
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// Make sure the cursor is in view
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assert!(self.cursor >= self.offset);
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@ -392,8 +395,11 @@ impl EditView {
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// If we have too much space
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if self.content[self.offset..].width() < self.last_length {
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assert!(self.last_length >= 1);
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let suffix_length =
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simple_suffix(&self.content, self.last_length - 1).length;
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assert!(self.content.len() >= 1);
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self.offset = self.content.len() - suffix_length;
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}
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}
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@ -425,6 +431,7 @@ impl View for EditView {
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printer.with_effect(effect, |printer| {
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if width < self.last_length {
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// No problem, everything fits.
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assert!(printer.size.x >= width);
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if self.secret {
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printer.print_hline((0, 0), width, "*");
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} else {
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@ -270,7 +270,7 @@ impl View for LinearLayout {
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}
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// This here is how much we're generously offered
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// (We just checked that req >= desperate, so the substraction is safe
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// (We just checked that req >= desperate, so the subtraction is safe
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let mut available = self.orientation.get(&(req - desperate));
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// println_stderr!("Available: {:?}", available);
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@ -279,7 +279,7 @@ impl View for LinearLayout {
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let mut overweight: Vec<(usize, usize)> = sizes.iter()
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.map(|v| self.orientation.get(v))
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.zip(min_sizes.iter().map(|v| self.orientation.get(v)))
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.map(|(a, b)| if a > b { a - b } else { 0 })
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.map(|(a, b)| a.saturating_sub(b))
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.enumerate()
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.collect();
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// println_stderr!("Overweight: {:?}", overweight);
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@ -199,7 +199,8 @@ impl ListView {
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}
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}
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fn try_focus((i, child): (usize, &mut ListChild), source: direction::Direction)
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fn try_focus((i, child): (usize, &mut ListChild),
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source: direction::Direction)
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-> Option<usize> {
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match *child {
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ListChild::Delimiter => None,
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@ -274,12 +275,8 @@ impl View for ListView {
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let spacing = 1;
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let scrollbar_width = if self.children.len() > size.y { 2 } else { 0 };
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let available = if label_width + spacing + scrollbar_width > size.x {
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// We have no space for the kids! :(
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0
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} else {
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size.x - label_width - spacing - scrollbar_width
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};
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let available = size.x.saturating_sub(label_width + spacing +
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scrollbar_width);
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// println_stderr!("Available: {}", available);
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@ -351,10 +348,8 @@ impl View for ListView {
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}
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fn call_on_any<'a>(&mut self, selector: &Selector,
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mut callback: Box<FnMut(&mut Any) + 'a>) {
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for view in self.children
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.iter_mut()
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.filter_map(ListChild::view) {
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mut callback: Box<FnMut(&mut Any) + 'a>) {
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for view in self.children.iter_mut().filter_map(ListChild::view) {
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view.call_on_any(selector, Box::new(|any| callback(any)));
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}
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}
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@ -364,7 +359,9 @@ impl View for ListView {
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.iter_mut()
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.enumerate()
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.filter_map(|(i, v)| v.view().map(|v| (i, v)))
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.filter_map(|(i, v)| v.focus_view(selector).ok().map(|_| i))
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.filter_map(|(i, v)| {
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v.focus_view(selector).ok().map(|_| i)
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})
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.next() {
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self.focus = i;
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Ok(())
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|
@ -170,7 +170,7 @@ impl MenuPopup {
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impl View for MenuPopup {
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fn draw(&self, printer: &Printer) {
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if printer.size.x < 2 || printer.size.y < 2 {
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if !printer.size.fits((2, 2)) {
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return;
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}
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@ -200,7 +200,8 @@ impl View for MenuPopup {
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}
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printer.print_hline((1, 0), printer.size.x - 2, " ");
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printer.print((2, 0), label);
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printer.print((printer.size.x - 4, 0), ">>");
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printer.print((printer.size.x.saturating_sub(4), 0),
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">>");
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}
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MenuItem::Leaf(ref label, _) => {
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if printer.size.x < 2 {
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@ -251,7 +252,12 @@ impl View for MenuPopup {
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Event::Key(Key::PageDown) => self.scroll_down(5, false),
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Event::Key(Key::Home) => self.focus = 0,
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Event::Key(Key::End) => self.focus = self.menu.children.len() - 1,
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Event::Key(Key::End) => {
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self.focus = self.menu
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.children
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.len()
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.saturating_sub(1)
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}
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Event::Key(Key::Right) if self.menu.children[self.focus]
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.is_subtree() => {
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@ -297,6 +303,7 @@ impl View for MenuPopup {
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}
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fn layout(&mut self, size: Vec2) {
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self.scrollbase.set_heights(size.y - 2, self.menu.children.len());
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self.scrollbase.set_heights(size.y.saturating_sub(2),
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self.menu.children.len());
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}
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}
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|
@ -20,11 +20,7 @@ impl<V: View> ViewWrapper for Panel<V> {
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fn wrap_required_size(&mut self, req: Vec2) -> Vec2 {
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// TODO: make borders conditional?
|
||||
let req = if Vec2::new(2, 2).fits_in(req) {
|
||||
req - (2, 2)
|
||||
} else {
|
||||
Vec2::zero()
|
||||
};
|
||||
let req = req.saturating_sub((2, 2));
|
||||
|
||||
self.view.required_size(req) + (2, 2)
|
||||
}
|
||||
@ -32,15 +28,11 @@ impl<V: View> ViewWrapper for Panel<V> {
|
||||
fn wrap_draw(&self, printer: &Printer) {
|
||||
printer.print_box((0, 0), printer.size, true);
|
||||
self.view.draw(&printer.sub_printer((1, 1),
|
||||
printer.size - (2, 2),
|
||||
printer.size.saturating_sub((2, 2)),
|
||||
true));
|
||||
}
|
||||
|
||||
fn wrap_layout(&mut self, size: Vec2) {
|
||||
self.view.layout(if Vec2::new(2, 2).fits_in(size) {
|
||||
size - (2, 2)
|
||||
} else {
|
||||
size
|
||||
});
|
||||
self.view.layout(size.saturating_sub((2, 2)));
|
||||
}
|
||||
}
|
||||
|
@ -1,7 +1,6 @@
|
||||
use Cursive;
|
||||
use Printer;
|
||||
use With;
|
||||
use XY;
|
||||
use align::{Align, HAlign, VAlign};
|
||||
use direction::Direction;
|
||||
use event::{Callback, Event, EventResult, Key};
|
||||
@ -67,7 +66,7 @@ pub struct SelectView<T = String> {
|
||||
last_size: Vec2,
|
||||
}
|
||||
|
||||
impl <T: 'static> Default for SelectView<T> {
|
||||
impl<T: 'static> Default for SelectView<T> {
|
||||
fn default() -> Self {
|
||||
Self::new()
|
||||
}
|
||||
@ -252,7 +251,8 @@ impl<T: 'static> SelectView<T> {
|
||||
printer.print_hline((0, 0), x, " ");
|
||||
printer.print((x, 0), &self.items[i].label);
|
||||
if l < printer.size.x {
|
||||
printer.print_hline((x + l, 0), printer.size.x - l - x, " ");
|
||||
assert!((l + x) <= printer.size.x);
|
||||
printer.print_hline((x + l, 0), printer.size.x - (l + x), " ");
|
||||
}
|
||||
}
|
||||
|
||||
@ -290,12 +290,11 @@ impl<T: 'static> SelectView<T> {
|
||||
|
||||
fn focus_up(&mut self, n: usize) {
|
||||
let focus = self.focus();
|
||||
let n = min(focus, n);
|
||||
self.focus.set(focus - n);
|
||||
self.focus.set(focus.saturating_sub(n));
|
||||
}
|
||||
|
||||
fn focus_down(&mut self, n: usize) {
|
||||
let focus = min(self.focus() + n, self.items.len() - 1);
|
||||
let focus = min(self.focus() + n, self.items.len().saturating_sub(1));
|
||||
self.focus.set(focus);
|
||||
}
|
||||
}
|
||||
@ -353,23 +352,22 @@ impl<T: 'static> View for SelectView<T> {
|
||||
} else {
|
||||
ColorStyle::Highlight
|
||||
};
|
||||
let x = printer.size.x;
|
||||
if x == 0 {
|
||||
return;
|
||||
}
|
||||
|
||||
let x = match printer.size.x.checked_sub(1) {
|
||||
Some(x) => x,
|
||||
None => return,
|
||||
};
|
||||
|
||||
printer.with_color(style, |printer| {
|
||||
// Prepare the entire background
|
||||
printer.print_hline((1, 0), x - 1, " ");
|
||||
printer.print_hline((1, 0), x, " ");
|
||||
// Draw the borders
|
||||
printer.print((0, 0), "<");
|
||||
printer.print((x - 1, 0), ">");
|
||||
printer.print((x, 0), ">");
|
||||
|
||||
let label = &self.items[self.focus()].label;
|
||||
|
||||
// And center the text?
|
||||
let offset = HAlign::Center.get_offset(label.len(), x);
|
||||
let offset = HAlign::Center.get_offset(label.len(), x + 1);
|
||||
|
||||
printer.print((offset, 0), label);
|
||||
});
|
||||
@ -445,20 +443,17 @@ impl<T: 'static> View for SelectView<T> {
|
||||
// We'll want to show the popup so that the text matches.
|
||||
// It'll be soo cool.
|
||||
let item_length = self.items[focus].label.len();
|
||||
let text_offset = if self.last_size.x >= item_length {
|
||||
(self.last_size.x - item_length) / 2
|
||||
} else {
|
||||
// We were too small to show the entire item last time.
|
||||
0
|
||||
};
|
||||
let text_offset =
|
||||
(self.last_size.x.saturating_sub(item_length)) / 2;
|
||||
// The total offset for the window is:
|
||||
// * the last absolute offset at which we drew this view
|
||||
// * shifted to the top of the focus (so the line matches)
|
||||
// * shifted to the right of the text offset
|
||||
// * shifted to the top of the focus (so the line matches)
|
||||
// * shifted top-left of the border+padding of the popup
|
||||
let offset = self.last_offset.get() - (0, focus) +
|
||||
(text_offset, 0) -
|
||||
(2, 1);
|
||||
let offset = self.last_offset.get();
|
||||
let offset = offset + (text_offset, 0);
|
||||
let offset = offset.saturating_sub((0, focus));
|
||||
let offset = offset.saturating_sub((2, 1));
|
||||
// And now, we can return the callback.
|
||||
EventResult::with_cb(move |s| {
|
||||
// The callback will want to work with a fresh Rc
|
||||
@ -468,12 +463,11 @@ impl<T: 'static> View for SelectView<T> {
|
||||
// A nice effect is that window resizes will keep both
|
||||
// layers together.
|
||||
let current_offset = s.screen().offset();
|
||||
let offset = XY::<isize>::from(offset) -
|
||||
current_offset;
|
||||
let offset = offset.signed() - current_offset;
|
||||
// And finally, put the view in view!
|
||||
s.screen_mut()
|
||||
.add_layer_at(Position::parent(offset),
|
||||
MenuPopup::new(tree).focus(focus));
|
||||
s.screen_mut().add_layer_at(Position::parent(offset),
|
||||
MenuPopup::new(tree)
|
||||
.focus(focus));
|
||||
})
|
||||
}
|
||||
_ => EventResult::Ignored,
|
||||
@ -488,7 +482,7 @@ impl<T: 'static> View for SelectView<T> {
|
||||
Event::Key(Key::PageUp) => self.focus_up(10),
|
||||
Event::Key(Key::PageDown) => self.focus_down(10),
|
||||
Event::Key(Key::Home) => self.focus.set(0),
|
||||
Event::Key(Key::End) => self.focus.set(self.items.len() - 1),
|
||||
Event::Key(Key::End) => self.focus.set(self.items.len().saturating_sub(1)),
|
||||
Event::Key(Key::Enter) if self.on_submit.is_some() => {
|
||||
let cb = self.on_submit.clone().unwrap();
|
||||
let v = self.selection();
|
||||
@ -504,9 +498,10 @@ impl<T: 'static> View for SelectView<T> {
|
||||
// the list when we reach the end.
|
||||
// This is achieved by chaining twice the iterator
|
||||
let iter = self.items.iter().chain(self.items.iter());
|
||||
if let Some((i, _)) = iter.enumerate()
|
||||
.skip(self.focus() + 1)
|
||||
.find(|&(_, item)| item.label.starts_with(c)) {
|
||||
if let Some((i, _)) =
|
||||
iter.enumerate()
|
||||
.skip(self.focus() + 1)
|
||||
.find(|&(_, item)| item.label.starts_with(c)) {
|
||||
// Apply modulo in case we have a hit
|
||||
// from the chained iterator
|
||||
self.focus.set(i % self.items.len());
|
||||
|
@ -49,13 +49,13 @@ impl<T: View> ViewWrapper for ShadowView<T> {
|
||||
|
||||
fn wrap_required_size(&mut self, req: Vec2) -> Vec2 {
|
||||
// Make sure req >= offset
|
||||
let offset = self.padding().or_min(req);
|
||||
self.view.required_size(req - offset) + offset
|
||||
let offset = self.padding();
|
||||
self.view.required_size(req.saturating_sub(offset)) + offset
|
||||
}
|
||||
|
||||
fn wrap_layout(&mut self, size: Vec2) {
|
||||
let offset = self.padding().or_min(size);
|
||||
self.view.layout(size - offset);
|
||||
let offset = self.padding();
|
||||
self.view.layout(size.saturating_sub(offset));
|
||||
}
|
||||
|
||||
fn wrap_draw(&self, printer: &Printer) {
|
||||
@ -74,6 +74,10 @@ impl<T: View> ViewWrapper for ShadowView<T> {
|
||||
let h = printer.size.y;
|
||||
let w = printer.size.x;
|
||||
|
||||
if h == 0 || w == 0 {
|
||||
return;
|
||||
}
|
||||
|
||||
printer.with_color(ColorStyle::Shadow, |printer| {
|
||||
printer.print_hline((1, h - 1), w - 1, " ");
|
||||
printer.print_vline((w - 1, 1), h - 1, " ");
|
||||
@ -81,8 +85,9 @@ impl<T: View> ViewWrapper for ShadowView<T> {
|
||||
}
|
||||
|
||||
// Draw the view background
|
||||
let printer =
|
||||
printer.sub_printer(Vec2::zero(), printer.size - (1, 1), true);
|
||||
let printer = printer.sub_printer(Vec2::zero(),
|
||||
printer.size.saturating_sub((1, 1)),
|
||||
true);
|
||||
self.view.draw(&printer);
|
||||
}
|
||||
}
|
||||
|
@ -192,13 +192,12 @@ impl TextView {
|
||||
// We take 1 column for the bar itself + 1 spacing column
|
||||
scrollbar_width = 2;
|
||||
|
||||
if size.x < scrollbar_width {
|
||||
// Again, this is a lost cause.
|
||||
return;
|
||||
}
|
||||
|
||||
// If we're too high, include a scrollbar_width
|
||||
let available = size.x - scrollbar_width;
|
||||
let available = match size.x.checked_sub(scrollbar_width) {
|
||||
Some(s) => s,
|
||||
None => return,
|
||||
};
|
||||
|
||||
self.rows = LinesIterator::new(&self.content, available).collect();
|
||||
|
||||
if self.rows.is_empty() && !self.content.is_empty() {
|
||||
|
Loading…
Reference in New Issue
Block a user