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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! Common handling of keyboard input and state management for text input controls
use dom::bindings::codegen::Bindings::KeyboardEventBinding::KeyboardEventMethods;
use dom::bindings::js::JSRef;
use dom::keyboardevent::KeyboardEvent;
use servo_util::str::DOMString;
use std::cmp::{min, max};
use std::default::Default;
#[jstraceable]
struct TextPoint {
line: uint,
index: uint,
}
#[jstraceable]
pub struct TextInput {
/// Current text input content, split across lines without trailing '\n'
lines: Vec<DOMString>,
/// Current cursor input point
edit_point: TextPoint,
/// Selection range, beginning and end point that can span multiple lines.
_selection: Option<(TextPoint, TextPoint)>,
/// Is this ia multiline input?
multiline: bool,
}
pub enum KeyReaction {
TriggerDefaultAction,
DispatchInput,
Nothing,
}
impl Default for TextPoint {
fn default() -> TextPoint {
TextPoint {
line: 0,
index: 0,
}
}
}
impl TextInput {
pub fn new(multiline: bool, initial: DOMString) -> TextInput {
let mut i = TextInput {
lines: vec!(),
edit_point: Default::default(),
_selection: None,
multiline: multiline,
};
i.set_content(initial);
i
}
fn get_current_line(&self) -> &DOMString {
&self.lines[self.edit_point.line]
}
fn insert_char(&mut self, ch: char) {
//TODO: handle replacing selection with character
let new_line = {
let prefix = self.get_current_line().as_slice().slice_chars(0, self.edit_point.index);
let suffix = self.get_current_line().as_slice().slice_chars(self.edit_point.index,
self.current_line_length());
let mut new_line = prefix.to_string();
new_line.push(ch);
new_line.push_str(suffix.as_slice());
new_line
};
self.lines[self.edit_point.line] = new_line;
self.edit_point.index += 1;
}
fn delete_char(&mut self, forward: bool) {
//TODO: handle deleting selection
let prefix_end = if forward {
self.edit_point.index
} else {
//TODO: handle backspacing from position 0 of current line
if self.multiline {
assert!(self.edit_point.index > 0);
} else if self.edit_point.index == 0 {
return;
}
self.edit_point.index - 1
};
let suffix_start = if forward {
let is_eol = self.edit_point.index == self.current_line_length() - 1;
if self.multiline {
//TODO: handle deleting from end position of current line
assert!(!is_eol);
} else if is_eol {
return;
}
self.edit_point.index + 1
} else {
self.edit_point.index
};
let new_line = {
let prefix = self.get_current_line().as_slice().slice_chars(0, prefix_end);
let suffix = self.get_current_line().as_slice().slice_chars(suffix_start,
self.current_line_length());
let mut new_line = prefix.to_string();
new_line.push_str(suffix);
new_line
};
self.lines[self.edit_point.line] = new_line;
if !forward {
self.adjust_horizontal(-1);
}
}
fn current_line_length(&self) -> uint {
self.lines[self.edit_point.line].len()
}
fn adjust_vertical(&mut self, adjust: int) {
if !self.multiline {
return;
}
if adjust < 0 && self.edit_point.line as int + adjust < 0 {
self.edit_point.index = 0;
self.edit_point.line = 0;
return;
} else if adjust > 0 && self.edit_point.line >= min(0, self.lines.len() - adjust as uint) {
self.edit_point.index = self.current_line_length();
self.edit_point.line = self.lines.len() - 1;
return;
}
self.edit_point.line = (self.edit_point.line as int + adjust) as uint;
self.edit_point.index = min(self.current_line_length(), self.edit_point.index);
}
fn adjust_horizontal(&mut self, adjust: int) {
if adjust < 0 {
if self.multiline {
let remaining = self.edit_point.index;
if adjust.abs() as uint > remaining {
self.edit_point.index = 0;
self.adjust_vertical(-1);
self.edit_point.index = self.current_line_length();
self.adjust_horizontal(adjust + remaining as int);
} else {
self.edit_point.index = (self.edit_point.index as int + adjust) as uint;
}
} else {
self.edit_point.index = max(0, self.edit_point.index as int + adjust) as uint;
}
} else {
if self.multiline {
let remaining = self.current_line_length() - self.edit_point.index;
if adjust as uint > remaining {
self.edit_point.index = 0;
self.adjust_vertical(1);
self.adjust_horizontal(adjust - remaining as int);
} else {
self.edit_point.index += adjust as uint;
}
} else {
self.edit_point.index = min(self.current_line_length(),
self.edit_point.index + adjust as uint);
}
}
}
fn handle_return(&mut self) -> KeyReaction {
if !self.multiline {
return TriggerDefaultAction;
}
//TODO: support replacing selection with newline
let prefix = self.get_current_line().as_slice().slice_chars(0, self.edit_point.index).to_string();
let suffix = self.get_current_line().as_slice().slice_chars(self.edit_point.index,
self.current_line_length()).to_string();
self.lines[self.edit_point.line] = prefix;
self.lines.insert(self.edit_point.line + 1, suffix);
return DispatchInput;
}
pub fn handle_keydown(&mut self, event: JSRef<KeyboardEvent>) -> KeyReaction {
match event.Key().as_slice() {
c if c.len() == 1 => {
self.insert_char(c.char_at(0));
return DispatchInput;
}
"Space" => {
self.insert_char(' ');
DispatchInput
}
"Delete" => {
self.delete_char(true);
DispatchInput
}
"Backspace" => {
self.delete_char(false);
DispatchInput
}
"ArrowLeft" => {
self.adjust_horizontal(-1);
Nothing
}
"ArrowRight" => {
self.adjust_horizontal(1);
Nothing
}
"ArrowUp" => {
self.adjust_vertical(-1);
Nothing
}
"ArrowDown" => {
self.adjust_vertical(1);
Nothing
}
"Enter" => self.handle_return(),
"Home" => {
self.edit_point.index = 0;
Nothing
}
"End" => {
self.edit_point.index = self.current_line_length();
Nothing
}
"Tab" => TriggerDefaultAction,
_ => Nothing,
}
}
pub fn get_content(&self) -> DOMString {
let mut content = "".to_string();
for (i, line) in self.lines.iter().enumerate() {
content.push_str(line.as_slice());
if i < self.lines.len() - 1 {
content.push('\n');
}
}
content
}
pub fn set_content(&mut self, content: DOMString) {
self.lines = if self.multiline {
content.as_slice().split('\n').map(|s| s.to_string()).collect()
} else {
vec!(content)
};
self.edit_point.line = min(self.edit_point.line, self.lines.len() - 1);
self.edit_point.index = min(self.edit_point.index, self.current_line_length() - 1);
}
}
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