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Prefer std::string over std::wstring. (#179)

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In the past, FTXUI switched from std::string to std::wstring to support
fullwidth characters. The reasons was that fullwidth characters can be
stored inside a single wchar_t.

Then FTXUI added support for combining characters. A single glygh
doesn't even fit a wchar_t. Instead, a glyph can be arbitrary large.

The usage of wstring doesn't really fit the new model and have several
drawbacks:
1. It doesn't simplify the implementation of FTXUI, because of combining
   characters.
2. It reduces drawing performance by 2x.
3. It increase Screen's memory allocation by 2x.

This patch converts FTXUI to use std::string internally. It now exposes
std::string based API. The std::wstring API remains, but is now
deprecated.

Tests and examples haven't been update to show the breakage is limited.
They will be updated in a second set of patches.

Bug: https://github.com/ArthurSonzogni/FTXUI/issues/153
Co-authored-by: Tushar Maheshwari <tushar27192@gmail.com>
This commit is contained in:
Arthur Sonzogni
2021-08-08 23:25:20 +02:00
committed by GitHub
parent 1ff894f6f5
commit 3b4ab618a3
84 changed files with 1234 additions and 996 deletions
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6
include/ftxui/component/event.hpp
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@@ -24,10 +24,9 @@ class ComponentBase;
/// https://invisible-island.net/xterm/ctlseqs/ctlseqs.html
struct Event {
// --- Constructor section ---------------------------------------------------
static Event Character(std::string);
static Event Character(char);
static Event Character(wchar_t);
static Event Character(std::string);
static Event Special(std::string);
static Event Mouse(std::string, Mouse mouse);
static Event CursorReporting(std::string, int x, int y);
@@ -58,7 +57,7 @@ struct Event {
//--- Method section ---------------------------------------------------------
bool is_character() const { return type_ == Type::Character; }
wchar_t character() const { return character_; }
std::string character() const { return input_; }
bool is_mouse() const { return type_ == Type::Mouse; }
struct Mouse& mouse() {
@@ -92,7 +91,6 @@ struct Event {
};
union {
wchar_t character_ = U'?';
struct Mouse mouse_;
struct Cursor cursor_;
};