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portapack-mayhem/firmware/application/apps/ui_text_editor.cpp

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/*
* Copyright (C) 2023 Kyle Reed
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "ui_fileman.hpp"
#include "ui_text_editor.hpp"
#include "ui_textentry.hpp"
#include "log_file.hpp"
#include "string_format.hpp"
using namespace portapack;
namespace fs = std::filesystem;
namespace ui {
/* TextViewer *******************************************************/
TextViewer::TextViewer(Rect parent_rect)
: Widget(parent_rect) {
set_focusable(true);
set_font_zoom(false);
}
void TextViewer::paint(Painter& painter) {
auto first_line = paint_state_.first_line;
auto first_col = paint_state_.first_col;
if (!has_file())
return;
// Move the viewport vertically.
if (cursor_.line < first_line)
first_line = cursor_.line;
else if (cursor_.line >= first_line + max_line)
first_line = cursor_.line - max_line + 1;
// Move the viewport horizontally.
if (cursor_.col < first_col)
first_col = cursor_.col;
if (cursor_.col >= first_col + max_col)
first_col = cursor_.col - max_col + 1;
// Viewport updated? Redraw text.
if (first_line != paint_state_.first_line ||
first_col != paint_state_.first_col) {
paint_state_.first_line = first_line;
paint_state_.first_col = first_col;
paint_state_.redraw_text = true;
paint_state_.line = UINT32_MAX; // forget old cursor position when overwritten
}
if (paint_state_.redraw_text) {
paint_text(painter, first_line, first_col);
paint_state_.redraw_text = false;
}
if (paint_state_.redraw_marked) {
paint_marked(painter);
paint_state_.redraw_marked = false;
}
paint_cursor(painter);
}
bool TextViewer::on_key(const KeyEvent key) {
int16_t delta_col = 0;
int16_t delta_line = 0;
if (key == KeyEvent::Left)
delta_col = -1;
else if (key == KeyEvent::Right)
delta_col = 1;
else if (key == KeyEvent::Up)
delta_line = -1;
else if (key == KeyEvent::Down)
delta_line = 1;
else if (key == KeyEvent::Select && on_select) {
on_select();
return true;
}
// Always allow cursor direction to be updated.
cursor_.dir = delta_col != 0 ? ScrollDirection::Horizontal : ScrollDirection::Vertical;
auto updated = apply_scrolling_constraints(delta_line, delta_col);
if (updated)
redraw();
return updated;
}
bool TextViewer::on_encoder(EncoderEvent delta) {
bool updated = false;
if (cursor_.dir == ScrollDirection::Horizontal)
updated = apply_scrolling_constraints(0, delta);
else {
delta *= 16;
updated = apply_scrolling_constraints(delta, 0);
}
if (updated)
redraw();
return updated;
}
void TextViewer::redraw(bool redraw_text, bool redraw_marked) {
paint_state_.redraw_text = redraw_text;
paint_state_.redraw_marked = redraw_marked;
set_dirty();
}
uint32_t TextViewer::offset() const {
auto range = file_->line_range(cursor_.line);
if (range)
return range->start + col();
return 0;
}
void TextViewer::cursor_home() {
cursor_.col = 0;
redraw();
}
void TextViewer::cursor_end() {
cursor_.col = line_length() - 1;
redraw();
}
void TextViewer::cursor_set(uint16_t line, uint16_t col) {
cursor_.line = line;
cursor_.col = col;
}
void TextViewer::cursor_mark_selected() {
LineColPair newMarker = std::make_pair(cursor_.line, cursor_.col);
auto it = std::find(lineColPair.begin(), lineColPair.end(), newMarker);
if (it != lineColPair.end()) {
lineColPair.erase(it);
} else {
lineColPair.push_back(newMarker);
}
// Mark pending change.
cursor_.mark_change = false;
redraw();
}
void TextViewer::cursor_clear_marked() {
lineColPair.clear();
redraw(true, true);
}
uint16_t TextViewer::line_length() {
return file_->line_length(cursor_.line);
}
bool TextViewer::apply_scrolling_constraints(int16_t delta_line, int16_t delta_col) {
if (!has_file())
return false;
int32_t new_line = cursor_.line + delta_line;
int32_t new_col = cursor_.col + delta_col;
int32_t new_line_length = file_->line_length(new_line);
if (new_col < 0)
--new_line;
else if (new_col >= new_line_length && delta_line == 0) {
// Only wrap if moving horizontally.
new_col = 0;
++new_line;
}
// Snap to first/last line to make navigating easier.
if (new_line < 0 && cursor_.line > 0) {
new_line = 0;
} else if (new_line >= (int32_t)file_->line_count()) {
auto last_line = file_->line_count() - 1;
if (cursor_.line < last_line)
new_line = last_line;
}
if (new_line < 0 || (uint32_t)new_line >= file_->line_count())
return false;
new_line_length = file_->line_length(new_line);
// Wrap or clamp column.
if (new_line_length == 0)
new_col = 0;
else if (new_col >= new_line_length || new_col < 0)
new_col = new_line_length - 1;
cursor_.line = new_line;
cursor_.col = new_col;
if (on_cursor_moved)
on_cursor_moved();
return true;
}
void TextViewer::paint_text(Painter& painter, uint32_t line, uint16_t col) {
auto r = screen_rect();
char buffer[max_col + 1];
// Draw the lines from the file
for (auto i = 0u; i < max_line; ++i) {
if (line + i >= file_->line_count())
break;
auto result = file_->get_text(line + i, col, buffer, max_col);
if (result && *result > 0)
painter.draw_string(
{0, r.top() + (int)i * char_height},
style(), {buffer, *result});
// Clear empty line sections. This is less visually jarring than full clear.
int32_t clear_width = max_col - (result ? *result : 0);
if (clear_width > 0)
painter.fill_rectangle(
{(max_col - clear_width) * char_width,
r.top() + (int)i * char_height,
clear_width * char_width, char_height},
style().background);
// if cursor line got overwritten, disable XOR of old cursor when displaying new cursor
if (i == paint_state_.line)
paint_state_.line = UINT32_MAX;
}
}
void TextViewer::paint_cursor(Painter& painter) {
if (!has_focus())
return;
auto xor_cursor = [this, &painter](int32_t line, uint16_t col) {
int cursor_width = char_width + 1;
int x = (col - paint_state_.first_col) * char_width - 1;
if (x < 0) { // cursor is one pixel narrower when in left column
cursor_width--;
x = 0;
}
int y = screen_rect().top() + (line - paint_state_.first_line) * char_height;
// Converting one row at a time to reduce buffer size
auto pbuf8 = cursor_.pixel_buffer8;
auto pbuf = cursor_.pixel_buffer;
for (auto col = 0; col < char_height; col++) {
// Annoyingly, read_pixels uses a 24-bit pixel format vs draw_pixels which uses 16-bit
portapack::display.read_pixels({x, y + col, cursor_width, 1}, pbuf8, cursor_width);
for (auto i = 0; i < cursor_width; i++)
pbuf[i] = Color(pbuf8[i].r, pbuf8[i].g, pbuf8[i].b).v ^ 0xFFFF;
portapack::display.draw_pixels({x, y + col, cursor_width, 1}, pbuf, cursor_width);
}
};
if (paint_state_.line != UINT32_MAX) // only XOR old cursor if it still appears on the screen
{
// Only reset previous cursor if we aren't marking.
if (paint_state_.mark_change) {
xor_cursor(paint_state_.line, paint_state_.col);
}
}
xor_cursor(cursor_.line, cursor_.col);
paint_state_.line = cursor_.line;
paint_state_.col = cursor_.col;
paint_state_.mark_change = cursor_.mark_change;
// Reset marking and wait for new change.
cursor_.mark_change = true;
}
void TextViewer::paint_marked(Painter& painter) {
auto xor_cursor = [this, &painter](int32_t line, uint16_t col) {
int cursor_width = char_width + 1;
int x = (col - paint_state_.first_col) * char_width - 1;
if (x < 0) { // cursor is one pixel narrower when in left column
cursor_width--;
x = 0;
}
int y = screen_rect().top() + (line - paint_state_.first_line) * char_height;
// Converting one row at a time to reduce buffer size
auto pbuf8 = cursor_.pixel_buffer8;
auto pbuf = cursor_.pixel_buffer;
for (auto col = 0; col < char_height; col++) {
// Annoyingly, read_pixels uses a 24-bit pixel format vs draw_pixels which uses 16-bit
portapack::display.read_pixels({x, y + col, cursor_width, 1}, pbuf8, cursor_width);
for (auto i = 0; i < cursor_width; i++)
pbuf[i] = Color(pbuf8[i].r, pbuf8[i].g, pbuf8[i].b).v ^ 0xFFFF;
portapack::display.draw_pixels({x, y + col, cursor_width, 1}, pbuf, cursor_width);
}
};
auto it = lineColPair.begin();
while (it != lineColPair.end()) {
LineColPair entry = (LineColPair)*it;
xor_cursor(entry.first, entry.second);
it++;
}
}
void TextViewer::reset_file(FileWrapper* file) {
file_ = file;
paint_state_.first_line = 0;
paint_state_.first_col = 0;
cursor_.line = 0;
cursor_.col = 0;
redraw(true);
}
void TextViewer::set_font_zoom(bool zoom) {
font_zoom = zoom;
font_style = font_zoom ? &Styles::white : &Styles::white_small;
char_height = style().font.line_height();
char_width = style().font.char_width();
max_line = (uint8_t)(parent_rect().height() / char_height);
max_col = (uint8_t)(parent_rect().width() / char_width);
}
/* TextEditorMenu ***************************************************/
TextEditorMenu::TextEditorMenu()
: View{{7 * 4, 9 * 4, 25 * 8, 25 * 8}} {
add_children(
{
&rect_frame,
&button_home,
&button_end,
&button_zoom,
&button_delline,
&button_edit,
&button_addline,
&button_open,
&button_save,
&button_exit,
});
}
void TextEditorMenu::on_show() {
hide_children(false);
button_edit.focus();
}
void TextEditorMenu::on_hide() {
hide_children(true);
}
void TextEditorMenu::hide_children(bool hidden) {
for (auto child : children()) {
child->hidden(hidden);
}
}
/* TextEditorView ***************************************************/
static fs::path get_temp_path(const fs::path& path) {
if (!path.empty())
return path + "~";
return {};
}
static void delete_temp_file(const fs::path& path) {
auto temp_path = get_temp_path(path);
if (!temp_path.empty()) {
delete_file(temp_path);
}
}
static void save_temp_file(const fs::path& path) {
delete_file(path);
copy_file(get_temp_path(path), path);
}
static void show_save_prompt(
NavigationView& nav,
std::function<void()> on_save,
std::function<void()> continuation) {
nav.display_modal(
"Save?", " Save changes?", YESNO,
[on_save](bool choice) {
if (choice && on_save)
on_save();
});
nav.set_on_pop(continuation);
}
TextEditorView::TextEditorView(NavigationView& nav)
: nav_{nav} {
add_children(
{
&viewer,
&menu,
&button_menu,
&text_position,
&text_size,
});
viewer.set_font_zoom(enable_zoom);
viewer.on_select = [this]() {
// Treat as if menu button was pressed.
if (button_menu.on_select)
button_menu.on_select();
};
viewer.on_cursor_moved = [this]() {
update_position();
};
menu.hidden(true);
menu.on_home() = [this]() {
viewer.cursor_home();
hide_menu(true);
};
menu.on_end() = [this]() {
viewer.cursor_end();
hide_menu(true);
};
menu.on_zoom() = [this]() {
enable_zoom = viewer.toggle_font_zoom();
refresh_ui();
hide_menu(true);
};
menu.on_delete_line() = [this]() {
prepare_for_write();
file_->delete_line(viewer.line());
refresh_ui();
hide_menu(true);
};
menu.on_edit_line() = [this]() {
show_edit_line();
};
menu.on_add_line() = [this]() {
prepare_for_write();
if (viewer.offset() < file_->size() - 1)
file_->insert_line(viewer.line());
else
file_->insert_line(-1); // Add after last line.
refresh_ui();
hide_menu(true);
};
menu.on_open() = [this]() {
show_save_prompt([this]() {
show_file_picker();
});
};
menu.on_save() = [this]() {
save_temp_file();
hide_menu(true);
};
menu.on_exit() = [this]() {
nav_.pop();
};
button_menu.on_select = [this]() {
if (file_) {
// Toggle menu.
hide_menu(!menu.hidden());
} else {
show_file_picker();
}
};
}
TextEditorView::TextEditorView(NavigationView& nav, const fs::path& path)
: TextEditorView(nav) {
open_file(path);
}
TextEditorView::~TextEditorView() {
// NB: Be careful here. The UI will render after this instance
// has been destroyed. Everything needed to render the UI
// and perform the save actions must be value captured.
if (file_dirty_) {
ui::show_save_prompt(
nav_,
[p = path_]() { ui::save_temp_file(p); },
[p = std::move(path_)]() { delete_temp_file(p); });
}
}
void TextEditorView::on_show() {
if (file_)
viewer.focus();
else
button_menu.focus();
}
void TextEditorView::open_file(const fs::path& path) {
file_.reset();
viewer.clear_file();
delete_temp_file(path_);
path_ = {};
file_dirty_ = false;
has_temp_file_ = false;
auto result = FileWrapper::open(
path, false, [](uint32_t value, uint32_t total) {
Painter p;
auto percent = (value * 100) / total;
auto width = (percent * screen_width) / 100;
p.draw_hline({0, 16}, width, Color::yellow());
});
if (!result) {
nav_.display_modal("Read Error", "Cannot open file:\n" + result.error().what());
} else {
file_ = *std::move(result);
path_ = path;
viewer.set_file(*file_);
}
refresh_ui();
}
void TextEditorView::refresh_ui() {
if (file_) {
update_position();
text_size.set(
"Lines:" + to_string_dec_uint(file_->line_count()) +
" (" + to_string_file_size(file_->size()) + ")");
} else {
text_position.set("");
text_size.set("");
}
}
void TextEditorView::update_position() {
if (viewer.has_file()) {
text_position.set(
"Ln " + to_string_dec_uint(viewer.line() + 1) +
", Col " + to_string_dec_uint(viewer.col() + 1));
}
}
void TextEditorView::hide_menu(bool hidden) {
menu.hidden(hidden);
// Only let the viewer be focused when the menu is
// not shown, otherwise menu focus gets confusing.
viewer.set_focusable(hidden);
if (hidden)
viewer.focus();
viewer.redraw(true);
set_dirty();
}
void TextEditorView::show_file_picker() {
auto open_view = nav_.push<FileLoadView>("");
open_view->on_changed = [this](std::filesystem::path path) {
// Can't update the UI focus while the FileLoadView is still up.
// Do this on a continuation instead of in on_changed.
nav_.set_on_pop([this, p = std::move(path)]() {
open_file(p);
hide_menu();
});
};
}
void TextEditorView::show_edit_line() {
auto str = file_->get_text(viewer.line(), 0, viewer.line_length());
if (!str) {
nav_.display_modal("Error", "Failed to get line text.");
return;
}
edit_line_buffer_ = *std::move(str);
text_prompt(
nav_,
edit_line_buffer_,
viewer.col(),
max_edit_length,
[this](std::string& buffer) {
auto range = file_->line_range(viewer.line());
if (!range)
return;
prepare_for_write();
file_->replace_range(*range, buffer);
});
nav_.set_on_pop([this]() {
edit_line_buffer_.clear();
refresh_ui();
hide_menu(true);
});
}
void TextEditorView::show_save_prompt(std::function<void()> continuation) {
if (!file_dirty_) {
if (continuation)
continuation();
return;
}
ui::show_save_prompt(
nav_,
[this]() { save_temp_file(); },
continuation);
}
void TextEditorView::prepare_for_write() {
file_dirty_ = true;
if (has_temp_file_)
return;
// TODO: This would be nice to have but it causes a stack overflow in an ISR?
// Painter p;
// p.draw_string({2, 48}, Styles::yellow, "Creating temporary file...");
// Copy to temp file on write.
has_temp_file_ = true;
delete_temp_file(path_);
copy_file(path_, get_temp_path(path_));
file_->assume_file(get_temp_path(path_));
}
void TextEditorView::save_temp_file() {
if (file_dirty_) {
ui::save_temp_file(path_);
file_dirty_ = false;
}
}
} // namespace ui
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