255 lines
6.6 KiB
Rust
255 lines
6.6 KiB
Rust
/*
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* meli
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*
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* Copyright 2017-2018 Manos Pitsidianakis
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*
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* This file is part of meli.
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*
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* meli is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* meli is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with meli. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*!
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Simple type definitions and macro helper for a (x,y) position on the terminal and the areas they define.
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An `Area` consists of two points: the upper left and bottom right corners.
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*/
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/// A `(x, y)` position on screen.
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pub type Pos = (usize, usize);
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#[inline(always)]
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pub fn get_x(p: Pos) -> usize {
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p.0
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}
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#[inline(always)]
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pub fn get_y(p: Pos) -> usize {
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p.1
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}
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#[inline(always)]
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pub fn set_x(p: Pos, new_x: usize) -> Pos {
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(new_x, p.1)
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}
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#[inline(always)]
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pub fn set_y(p: Pos, new_y: usize) -> Pos {
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(p.0, new_y)
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}
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#[inline(always)]
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pub fn pos_inc(p: Pos, inc: (usize, usize)) -> Pos {
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(p.0 + inc.0, p.1 + inc.1)
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}
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#[inline(always)]
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pub fn pos_dec(p: Pos, dec: (usize, usize)) -> Pos {
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(p.0.saturating_sub(dec.0), p.1.saturating_sub(dec.1))
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}
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/// An `Area` consists of two points: the upper left and bottom right corners.
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///
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/// Example:
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/// ```no_run
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/// let new_area = ((0, 0), (1, 1));
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/// ```
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pub type Area = (Pos, Pos);
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/// Get an area's height
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///
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/// Example:
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/// ```no_run
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/// use meli::height;
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///
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/// let new_area = ((0, 0), (1, 1));
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/// assert_eq!(height!(new_area), 1);
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/// ```
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#[macro_export]
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macro_rules! height {
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($a:expr) => {
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($crate::get_y($crate::bottom_right!($a)))
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.saturating_sub($crate::get_y($crate::upper_left!($a)))
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};
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}
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/// Get an area's width
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///
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/// Example:
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/// ```no_run
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/// use meli::width;
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///
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/// let new_area = ((0, 0), (1, 1));
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/// assert_eq!(width!(new_area), 1);
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/// ```
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#[macro_export]
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macro_rules! width {
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($a:expr) => {
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($crate::get_x($crate::bottom_right!($a)))
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.saturating_sub($crate::get_x($crate::upper_left!($a)))
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};
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}
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/// Get the upper left Position of an area
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///
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/// Example:
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/// ```no_run
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/// use meli::upper_left;
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///
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/// let new_area = ((0, 0), (1, 1));
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/// assert_eq!(upper_left!(new_area), (0, 0));
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/// ```
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#[macro_export]
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macro_rules! upper_left {
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($a:expr) => {
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$a.0
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};
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}
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/// Get the bottom right Position of an area
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///
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/// Example:
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/// ```no_run
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/// use meli::bottom_right;
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///
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/// let new_area = ((0, 0), (1, 1));
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/// assert_eq!(bottom_right!(new_area), (1, 1));
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/// ```
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#[macro_export]
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macro_rules! bottom_right {
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($a:expr) => {
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$a.1
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};
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}
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/// Check if area is valid.
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///
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/// Example:
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/// ```no_run
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/// use meli::is_valid_area;
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///
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/// let valid_area = ((0, 0), (1, 1));
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/// assert!(is_valid_area!(valid_area));
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///
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/// let invalid_area = ((2, 2), (1, 1));
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/// assert!(!is_valid_area!(invalid_area));
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/// ```
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///
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#[macro_export]
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macro_rules! is_valid_area {
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($a:expr) => {{
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let upper_left = $crate::upper_left!($a);
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let bottom_right = $crate::bottom_right!($a);
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!($crate::get_y(upper_left) > $crate::get_y(bottom_right)
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|| $crate::get_x(upper_left) > $crate::get_x(bottom_right))
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}};
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}
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/// Place box given by `(width, height)` in center of `area`
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pub fn center_area(area: Area, (width, height): (usize, usize)) -> Area {
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let mid_x = { std::cmp::max(width!(area) / 2, width / 2) - width / 2 };
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let mid_y = { std::cmp::max(height!(area) / 2, height / 2) - height / 2 };
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let (upper_x, upper_y) = upper_left!(area);
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let (max_x, max_y) = bottom_right!(area);
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(
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(
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std::cmp::min(max_x, upper_x + mid_x),
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std::cmp::min(max_y, upper_y + mid_y),
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),
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(
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std::cmp::min(max_x, upper_x + mid_x + width),
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std::cmp::min(max_y, upper_y + mid_y + height),
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),
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)
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}
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#[derive(Debug, Copy, Clone, PartialEq, Eq)]
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pub enum Alignment {
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/// Stretch to fill all space if possible, center if no meaningful way to stretch.
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Fill,
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/// Snap to left or top side, leaving space on right or bottom.
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Start,
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/// Snap to right or bottom side, leaving space on left or top.
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End,
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/// Center natural width of widget inside the allocation.
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Center,
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}
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impl Default for Alignment {
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fn default() -> Self {
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Alignment::Center
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}
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}
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/// Place given area of dimensions `(width, height)` inside `area` according to given alignment
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pub fn align_area(
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area: Area,
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(width, height): (usize, usize),
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vertical_alignment: Alignment,
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horizontal_alignment: Alignment,
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) -> Area {
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let (top_x, width) = match horizontal_alignment {
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Alignment::Center => (
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{ std::cmp::max(width!(area) / 2, width / 2) - width / 2 },
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width,
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),
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Alignment::Start => (0, width),
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Alignment::End => (width!(area).saturating_sub(width), width!(area)),
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Alignment::Fill => (0, width!(area)),
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};
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let (top_y, height) = match vertical_alignment {
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Alignment::Center => (
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{ std::cmp::max(height!(area) / 2, height / 2) - height / 2 },
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height,
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),
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Alignment::Start => (0, height),
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Alignment::End => (height!(area).saturating_sub(height), height!(area)),
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Alignment::Fill => (0, height!(area)),
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};
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let (upper_x, upper_y) = upper_left!(area);
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let (max_x, max_y) = bottom_right!(area);
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(
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(
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std::cmp::min(max_x, upper_x + top_x),
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std::cmp::min(max_y, upper_y + top_y),
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),
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(
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std::cmp::min(max_x, upper_x + top_x + width),
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std::cmp::min(max_y, upper_y + top_y + height),
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),
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)
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}
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/// Place box given by `(width, height)` in corner of `area`
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pub fn place_in_area(area: Area, (width, height): (usize, usize), upper: bool, left: bool) -> Area {
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let (upper_x, upper_y) = upper_left!(area);
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let (max_x, max_y) = bottom_right!(area);
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let x = if upper {
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upper_x + 2
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} else {
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max_x.saturating_sub(2).saturating_sub(width)
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};
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let y = if left {
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upper_y + 2
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} else {
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max_y.saturating_sub(2).saturating_sub(height)
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};
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(
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(std::cmp::min(x, max_x), std::cmp::min(y, max_y)),
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(
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std::cmp::min(x + width, max_x),
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std::cmp::min(y + height, max_y),
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),
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)
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}
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