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143 lines
3.8 KiB
Zig
143 lines
3.8 KiB
Zig
const std = @import("std");
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const interop = @import("../../interop.zig");
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const TerminalBuffer = @import("../TerminalBuffer.zig");
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const utils = @import("../utils.zig");
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const Allocator = std.mem.Allocator;
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const DynamicString = std.ArrayList(u8);
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const termbox = interop.termbox;
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const Text = @This();
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allocator: Allocator,
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buffer: *TerminalBuffer,
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text: DynamicString,
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end: u64,
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cursor: u64,
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visible_start: u64,
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visible_length: u64,
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x: u64,
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y: u64,
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pub fn init(allocator: Allocator, buffer: *TerminalBuffer, max_length: u64) !Text {
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const text = try DynamicString.initCapacity(allocator, max_length);
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return .{
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.allocator = allocator,
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.buffer = buffer,
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.text = text,
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.end = 0,
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.cursor = 0,
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.visible_start = 0,
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.visible_length = 0,
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.x = 0,
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.y = 0,
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};
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}
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pub fn deinit(self: Text) void {
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self.text.deinit();
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}
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pub fn position(self: *Text, x: u64, y: u64, visible_length: u64) void {
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self.x = x;
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self.y = y;
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self.visible_length = visible_length;
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}
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pub fn handle(self: *Text, maybe_event: ?*termbox.tb_event, insert_mode: bool) !void {
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if (maybe_event) |event| blk: {
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if (event.type != termbox.TB_EVENT_KEY) break :blk;
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switch (event.key) {
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termbox.TB_KEY_ARROW_LEFT => self.goLeft(),
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termbox.TB_KEY_ARROW_RIGHT => self.goRight(),
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termbox.TB_KEY_DELETE => self.delete(),
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termbox.TB_KEY_BACKSPACE, termbox.TB_KEY_BACKSPACE2 => {
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if (insert_mode) {
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self.backspace();
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} else {
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self.goLeft();
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}
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},
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termbox.TB_KEY_SPACE => try self.write(' '),
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else => {
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if (event.ch > 31 and event.ch < 127) {
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if (insert_mode) {
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try self.write(@intCast(event.ch));
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} else {
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switch (event.ch) {
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'h' => self.goLeft(),
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'l' => self.goRight(),
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else => {},
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}
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}
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}
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},
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}
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}
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termbox.tb_set_cursor(@intCast(self.x + (self.cursor - self.visible_start)), @intCast(self.y));
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}
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pub fn draw(self: Text) void {
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const length = @min(self.text.items.len, self.visible_length);
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if (length == 0) return;
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const visible_slice = if (self.text.items.len > self.visible_length and self.cursor < self.text.items.len) self.text.items[self.visible_start..(self.visible_length + self.visible_start)] else self.text.items[self.visible_start..];
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self.buffer.drawLabel(visible_slice, self.x, self.y);
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}
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pub fn drawMasked(self: Text, mask: u8) void {
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const length = @min(self.text.items.len, self.visible_length - 1);
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if (length == 0) return;
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self.buffer.drawCharMultiple(mask, self.x, self.y, length);
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}
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pub fn clear(self: *Text) void {
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self.text.clearRetainingCapacity();
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self.end = 0;
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self.cursor = 0;
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self.visible_start = 0;
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}
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fn goLeft(self: *Text) void {
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if (self.cursor == 0) return;
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if (self.visible_start > 0) self.visible_start -= 1;
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self.cursor -= 1;
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}
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fn goRight(self: *Text) void {
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if (self.cursor >= self.end) return;
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if (self.cursor - self.visible_start == self.visible_length - 1) self.visible_start += 1;
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self.cursor += 1;
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}
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fn delete(self: *Text) void {
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if (self.cursor >= self.end) return;
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_ = self.text.orderedRemove(self.cursor);
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self.end -= 1;
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}
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fn backspace(self: *Text) void {
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if (self.cursor == 0) return;
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self.goLeft();
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self.delete();
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}
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fn write(self: *Text, char: u8) !void {
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if (char == 0) return;
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try self.text.insert(self.cursor, char);
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self.end += 1;
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self.goRight();
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}
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