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ladybird/Userland/Libraries/LibGUI/GlyphMapWidget.cpp
Gabriel Nava Marino f4515aae80 Userland: Draw tooltip over glyph to show UTF-8 code point 
Currently finding a particular glyph with a given code point is
a bit tedious as it requires clicking on the glyph to update the
status bar and display the glyph's name and codepoint. A more
convenient way to know where we are in the Glyph Map is by seeing
a tooltip over the glyph where the mouse is currently hovering over.
This patch adds that support by setting the Widget tooltip with the
glyph found at the current position in GlyphMapWidget::mousemove_event.
2023-10-26 11:12:49 +02:00

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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Mustafa Quraish <mustafa@serenityos.org>
* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "GlyphMapWidget.h"
#include <LibGUI/Painter.h>
#include <LibGfx/Font/BitmapFont.h>
#include <LibGfx/Font/Emoji.h>
#include <LibGfx/Palette.h>
REGISTER_WIDGET(GUI, GlyphMapWidget);
namespace GUI {
GlyphMapWidget::Selection GlyphMapWidget::Selection::normalized() const
{
if (m_size > 0)
return *this;
return { m_start + m_size, -m_size + 1 };
}
void GlyphMapWidget::Selection::resize_by(int i)
{
m_size += i;
if (m_size == 0) {
if (i < 0)
m_size--;
else
m_size++;
}
}
bool GlyphMapWidget::Selection::contains(int i) const
{
auto this_normalized = normalized();
return i >= this_normalized.m_start && i < this_normalized.m_start + this_normalized.m_size;
}
void GlyphMapWidget::Selection::extend_to(int glyph)
{
m_size = glyph - m_start;
if (m_size >= 0)
m_size++;
}
GlyphMapWidget::GlyphMapWidget()
: AbstractScrollableWidget()
{
set_focus_policy(FocusPolicy::StrongFocus);
horizontal_scrollbar().set_visible(false);
did_change_font();
set_active_glyph('A');
}
void GlyphMapWidget::resize_event(ResizeEvent& event)
{
recalculate_content_size();
AbstractScrollableWidget::resize_event(event);
}
void GlyphMapWidget::set_active_glyph(int glyph, ShouldResetSelection should_reset_selection)
{
if (m_active_glyph == glyph && should_reset_selection == ShouldResetSelection::No)
return;
m_active_glyph = glyph;
if (should_reset_selection == ShouldResetSelection::Yes) {
m_selection.set_start(glyph);
m_selection.set_size(1);
}
if (on_active_glyph_changed)
on_active_glyph_changed(glyph);
update();
}
void GlyphMapWidget::set_selection(int start, int size, Optional<u32> active_glyph)
{
m_selection.set_start(start);
m_selection.set_size(size);
if (active_glyph.has_value())
set_active_glyph(active_glyph.value(), ShouldResetSelection::No);
}
void GlyphMapWidget::restore_selection(int start, int size, int active_glyph)
{
if (start == active_glyph && size > 1) {
start = active_glyph + size - 1;
size = -size + 1;
}
m_selection.set_start(start);
m_selection.set_size(size);
set_active_glyph(active_glyph, ShouldResetSelection::No);
}
Gfx::IntRect GlyphMapWidget::get_outer_rect(int glyph) const
{
glyph -= m_active_range.first;
int row = glyph / columns();
int column = glyph % columns();
return Gfx::IntRect {
column * (font().max_glyph_width() + m_horizontal_spacing),
row * (font().pixel_size_rounded_up() + m_vertical_spacing),
font().max_glyph_width() + m_horizontal_spacing,
font().pixel_size_rounded_up() + m_vertical_spacing
}
.translated(frame_thickness() - horizontal_scrollbar().value(), frame_thickness() - vertical_scrollbar().value());
}
void GlyphMapWidget::update_glyph(int glyph)
{
set_glyph_modified(glyph, true);
update(get_outer_rect(glyph));
}
void GlyphMapWidget::paint_event(PaintEvent& event)
{
Frame::paint_event(event);
if (!is_enabled())
return;
Painter painter(*this);
painter.add_clip_rect(widget_inner_rect());
painter.add_clip_rect(event.rect());
painter.set_font(font());
painter.fill_rect(widget_inner_rect(), palette().window().darkened(0.8f));
auto first_row = vertical_scrollbar().value() / vertical_scrollbar().step();
auto first_glyph = first_row * columns() + m_active_range.first;
auto last_glyph = m_active_range.last;
for (u32 glyph = first_glyph; glyph <= first_glyph + m_visible_glyphs && glyph <= last_glyph; ++glyph) {
Gfx::IntRect outer_rect = get_outer_rect(glyph);
Gfx::IntRect inner_rect(
outer_rect.x() + m_horizontal_spacing / 2,
outer_rect.y() + m_vertical_spacing / 2,
font().max_glyph_width(),
font().pixel_size_rounded_up());
if (m_selection.contains(glyph)) {
painter.fill_rect(outer_rect, is_focused() ? palette().selection() : palette().inactive_selection());
if (font().contains_glyph(glyph))
painter.draw_glyph(inner_rect.location(), glyph, is_focused() ? palette().selection_text() : palette().inactive_selection_text());
else if (auto* emoji = Gfx::Emoji::emoji_for_code_point(glyph); emoji && m_show_system_emoji)
painter.draw_emoji(inner_rect.location(), *emoji, font());
} else if (font().contains_glyph(glyph)) {
if (m_highlight_modifications && m_modified_glyphs.contains(glyph)) {
if (m_original_font && m_original_font->contains_glyph(glyph)) {
// Modified
if (palette().is_dark())
painter.fill_rect(outer_rect, Gfx::Color { 0, 65, 159 });
else
painter.fill_rect(outer_rect, Gfx::Color { 138, 185, 252 });
} else {
// Newly created
if (palette().is_dark())
painter.fill_rect(outer_rect, Gfx::Color { 8, 127, 0 });
else
painter.fill_rect(outer_rect, Gfx::Color { 133, 251, 116 });
}
} else {
painter.fill_rect(outer_rect, palette().base());
}
painter.draw_glyph(inner_rect.location(), glyph, palette().base_text());
} else if (auto* emoji = Gfx::Emoji::emoji_for_code_point(glyph); emoji && m_show_system_emoji) {
painter.draw_emoji(inner_rect.location(), *emoji, font());
} else {
if (m_highlight_modifications && m_original_font && m_original_font->contains_glyph(glyph)) {
// Deleted
if (palette().is_dark())
painter.fill_rect(outer_rect, Gfx::Color { 127, 0, 0 });
else
painter.fill_rect(outer_rect, Gfx::Color { 255, 150, 150 });
} else {
painter.fill_rect(outer_rect, palette().window());
}
}
}
painter.draw_focus_rect(get_outer_rect(m_active_glyph), palette().focus_outline());
}
Optional<int> GlyphMapWidget::glyph_at_position(Gfx::IntPoint position) const
{
Gfx::IntPoint map_offset { frame_thickness() - horizontal_scrollbar().value(), frame_thickness() - vertical_scrollbar().value() };
auto map_position = position - map_offset;
auto col = (map_position.x() - 1) / ((font().max_glyph_width() + m_horizontal_spacing));
auto row = (map_position.y() - 1) / ((font().pixel_size_rounded_up() + m_vertical_spacing));
auto glyph = row * columns() + col + m_active_range.first;
if (row >= 0 && row < rows() && col >= 0 && col < columns() && glyph < m_glyph_count + m_active_range.first)
return glyph;
return {};
}
int GlyphMapWidget::glyph_at_position_clamped(Gfx::IntPoint position) const
{
Gfx::IntPoint map_offset { frame_thickness() - horizontal_scrollbar().value(), frame_thickness() - vertical_scrollbar().value() };
auto map_position = position - map_offset;
auto col = clamp((map_position.x() - 1) / ((font().max_glyph_width() + m_horizontal_spacing)), 0, columns() - 1);
auto row = clamp((map_position.y() - 1) / ((font().pixel_size_rounded_up() + m_vertical_spacing)), 0, rows() - 1);
auto glyph = row * columns() + col + m_active_range.first;
if (row == rows() - 1)
glyph = min(glyph, m_glyph_count + m_active_range.first - 1);
return glyph;
}
void GlyphMapWidget::context_menu_event(GUI::ContextMenuEvent& event)
{
if (on_context_menu_request)
on_context_menu_request(event);
}
void GlyphMapWidget::mousedown_event(MouseEvent& event)
{
if (event.button() == MouseButton::Secondary)
return;
if (auto maybe_glyph = glyph_at_position(event.position()); maybe_glyph.has_value()) {
auto glyph = maybe_glyph.value();
if (event.shift())
m_selection.extend_to(glyph);
m_in_drag_select = true;
set_active_glyph(glyph, event.shift() ? ShouldResetSelection::No : ShouldResetSelection::Yes);
}
}
void GlyphMapWidget::mouseup_event(GUI::MouseEvent& event)
{
if (event.button() == MouseButton::Secondary)
return;
if (!m_in_drag_select)
return;
auto constrained = event.position().constrained(widget_inner_rect());
if (auto maybe_glyph = glyph_at_position(constrained); maybe_glyph.has_value()) {
auto glyph = maybe_glyph.value();
m_selection.extend_to(glyph);
set_active_glyph(glyph, ShouldResetSelection::No);
}
m_in_drag_select = false;
}
void GlyphMapWidget::mousemove_event(GUI::MouseEvent& event)
{
m_last_mousemove_position = event.position();
if (auto maybe_glyph = glyph_at_position(event.position()); maybe_glyph.has_value() && maybe_glyph != m_tooltip_glyph) {
m_tooltip_glyph = maybe_glyph.value();
auto draw_tooltip = [this]() -> ErrorOr<void> {
StringBuilder builder;
TRY(builder.try_appendff("U+{:04X}", m_tooltip_glyph));
set_tooltip(TRY(builder.to_string()));
return {};
}();
if (draw_tooltip.is_error())
warnln("Failed to draw tooltip");
}
if (m_in_drag_select) {
auto constrained = event.position().constrained(widget_inner_rect());
auto glyph = glyph_at_position_clamped(constrained);
m_selection.extend_to(glyph);
set_active_glyph(glyph, ShouldResetSelection::No);
scroll_to_glyph(glyph);
update();
}
}
void GlyphMapWidget::automatic_scrolling_timer_did_fire()
{
if (!m_in_drag_select) {
set_automatic_scrolling_timer_active(false);
return;
}
auto glyph = glyph_at_position_clamped(m_last_mousemove_position);
m_selection.extend_to(glyph);
set_active_glyph(glyph, ShouldResetSelection::No);
scroll_to_glyph(glyph);
update();
}
void GlyphMapWidget::doubleclick_event(MouseEvent& event)
{
if (on_glyph_double_clicked) {
if (auto maybe_glyph = glyph_at_position(event.position()); maybe_glyph.has_value())
on_glyph_double_clicked(maybe_glyph.value());
}
}
void GlyphMapWidget::keydown_event(KeyEvent& event)
{
if (event.key() == KeyCode::Key_Tab) {
AbstractScrollableWidget::keydown_event(event);
return;
}
if (event.key() == KeyCode::Key_Escape) {
m_selection.set_size(1);
m_selection.set_start(m_active_glyph);
if (on_escape_pressed)
on_escape_pressed();
return;
}
if (!event.modifiers() && event.is_arrow_key()) {
m_selection.set_size(1);
m_selection.set_start(m_active_glyph);
}
if (event.shift() && event.is_arrow_key()) {
auto resizing_end = m_selection.start() + m_selection.size() - (m_selection.size() > 0 ? 1 : 0);
set_active_glyph(resizing_end, ShouldResetSelection::No);
scroll_to_glyph(resizing_end);
}
int first_glyph = m_active_range.first;
int last_glyph = m_active_range.last;
auto selection = m_selection.normalized();
if (event.key() == KeyCode::Key_Up) {
if (m_active_glyph - m_columns < first_glyph)
return;
if (event.ctrl() && selection.start() - m_columns < first_glyph)
return;
if (event.shift())
m_selection.extend_to(m_active_glyph - m_columns);
else
m_selection.set_start(m_selection.start() - m_columns);
set_active_glyph(m_active_glyph - m_columns, ShouldResetSelection::No);
scroll_to_glyph(m_active_glyph);
return;
}
if (event.key() == KeyCode::Key_Down) {
if (m_active_glyph + m_columns > last_glyph)
return;
if (event.ctrl() && selection.start() + selection.size() - 1 + m_columns > last_glyph)
return;
if (event.shift())
m_selection.extend_to(m_active_glyph + m_columns);
else
m_selection.set_start(m_selection.start() + m_columns);
set_active_glyph(m_active_glyph + m_columns, ShouldResetSelection::No);
scroll_to_glyph(m_active_glyph);
return;
}
if (event.key() == KeyCode::Key_Left) {
if (event.alt())
return event.ignore();
if (m_active_glyph - 1 < first_glyph)
return;
if (event.ctrl() && selection.start() - 1 < first_glyph)
return;
if (event.shift())
m_selection.resize_by(-1);
else
m_selection.set_start(m_selection.start() - 1);
set_active_glyph(m_active_glyph - 1, ShouldResetSelection::No);
scroll_to_glyph(m_active_glyph);
return;
}
if (event.key() == KeyCode::Key_Right) {
if (event.alt())
return event.ignore();
if (m_active_glyph + 1 > last_glyph)
return;
if (event.ctrl() && selection.start() + selection.size() > last_glyph)
return;
if (event.shift())
m_selection.resize_by(1);
else
m_selection.set_start(m_selection.start() + 1);
set_active_glyph(m_active_glyph + 1, ShouldResetSelection::No);
scroll_to_glyph(m_active_glyph);
return;
}
if (event.key() == KeyCode::Key_Home) {
if (event.alt()) {
set_active_glyph(first_glyph);
scroll_to_glyph(m_active_glyph);
return;
}
if (event.ctrl() && event.shift()) {
m_selection.extend_to(first_glyph);
set_active_glyph(first_glyph, ShouldResetSelection::No);
scroll_to_glyph(m_active_glyph);
return;
}
auto start_of_row = (m_active_glyph - first_glyph) / m_columns * m_columns;
if (event.shift())
m_selection.extend_to(start_of_row + first_glyph);
set_active_glyph(start_of_row + first_glyph, event.shift() ? ShouldResetSelection::No : ShouldResetSelection::Yes);
return;
}
if (event.key() == KeyCode::Key_End) {
if (event.alt()) {
set_active_glyph(last_glyph);
scroll_to_glyph(m_active_glyph);
return;
}
if (event.ctrl() && event.shift()) {
m_selection.extend_to(last_glyph);
set_active_glyph(last_glyph, ShouldResetSelection::No);
scroll_to_glyph(m_active_glyph);
return;
}
auto end_of_row = (m_active_glyph - first_glyph) / m_columns * m_columns + (m_columns - 1);
end_of_row = clamp(end_of_row + first_glyph, first_glyph, last_glyph);
if (event.shift())
m_selection.extend_to(end_of_row);
set_active_glyph(end_of_row, event.shift() ? ShouldResetSelection::No : ShouldResetSelection::Yes);
return;
}
{
auto first_visible_row = vertical_scrollbar().value() / vertical_scrollbar().step();
auto last_visible_row = first_visible_row + m_visible_rows;
auto current_row = (m_active_glyph - first_glyph) / columns();
auto page = m_active_glyph;
if (event.key() == KeyCode::Key_PageDown) {
auto current_page = m_active_glyph + m_columns * (last_visible_row - current_row);
auto next_page = m_active_glyph + m_columns * m_visible_rows;
auto remainder = m_active_glyph + m_columns * ((last_glyph - first_glyph) / columns() - current_row);
if (current_row < last_visible_row && current_page <= last_glyph)
page = current_page;
else if (next_page <= last_glyph)
page = next_page;
else if (remainder <= last_glyph)
page = remainder;
else
page = remainder - m_columns; // Bottom rows do not always extend across all columns
if (event.shift())
m_selection.extend_to(page);
set_active_glyph(page, event.shift() ? ShouldResetSelection::No : ShouldResetSelection::Yes);
scroll_to_glyph(m_active_glyph);
return;
}
if (event.key() == KeyCode::Key_PageUp) {
auto current_page = m_active_glyph - m_columns * (current_row - first_visible_row);
auto previous_page = m_active_glyph - m_columns * m_visible_rows;
auto remainder = m_active_glyph - m_columns * current_row;
if (current_row > first_visible_row && current_page >= first_glyph)
page = current_page;
else if (previous_page >= first_glyph)
page = previous_page;
else
page = remainder;
if (event.shift())
m_selection.extend_to(page);
set_active_glyph(page, event.shift() ? ShouldResetSelection::No : ShouldResetSelection::Yes);
scroll_to_glyph(m_active_glyph);
return;
}
}
event.ignore();
}
void GlyphMapWidget::did_change_font()
{
recalculate_content_size();
vertical_scrollbar().set_step(font().pixel_size_rounded_up() + m_vertical_spacing);
}
void GlyphMapWidget::scroll_to_glyph(int glyph)
{
glyph -= m_active_range.first;
int row = glyph / columns();
int column = glyph % columns();
auto scroll_rect = Gfx::IntRect {
column * (font().max_glyph_width() + m_horizontal_spacing),
row * (font().pixel_size_rounded_up() + m_vertical_spacing),
font().max_glyph_width() + m_horizontal_spacing,
font().pixel_size_rounded_up() + m_vertical_spacing
};
scroll_into_view(scroll_rect, true, true);
}
void GlyphMapWidget::select_previous_existing_glyph()
{
bool search_wrapped = false;
int first_glyph = m_active_range.first;
int last_glyph = m_active_range.last;
for (int i = active_glyph() - 1;; --i) {
if (i < first_glyph && !search_wrapped) {
i = last_glyph;
search_wrapped = true;
} else if (i < first_glyph && search_wrapped) {
break;
}
if (font().contains_glyph(i)) {
set_focus(true);
set_active_glyph(i);
scroll_to_glyph(i);
break;
}
}
}
void GlyphMapWidget::select_next_existing_glyph()
{
bool search_wrapped = false;
int first_glyph = m_active_range.first;
int last_glyph = m_active_range.last;
for (int i = active_glyph() + 1;; ++i) {
if (i > last_glyph && !search_wrapped) {
i = first_glyph;
search_wrapped = true;
} else if (i > last_glyph && search_wrapped) {
break;
}
if (font().contains_glyph(i)) {
set_focus(true);
set_active_glyph(i);
scroll_to_glyph(i);
break;
}
}
}
void GlyphMapWidget::recalculate_content_size()
{
auto event_width = widget_inner_rect().width();
auto event_height = widget_inner_rect().height();
m_columns = max(event_width / (font().max_glyph_width() + m_horizontal_spacing), 1);
m_rows = ceil_div(m_glyph_count, m_columns);
constexpr auto overdraw_margins = 2;
auto max_visible_rows = event_height / (font().pixel_size_rounded_up() + m_vertical_spacing);
m_visible_rows = min(max_visible_rows, m_rows);
m_visible_glyphs = (m_visible_rows + overdraw_margins) * m_columns;
int content_width = columns() * (font().max_glyph_width() + m_horizontal_spacing);
int content_height = rows() * (font().pixel_size_rounded_up() + m_vertical_spacing);
set_content_size({ content_width, content_height });
scroll_to_glyph(m_active_glyph);
}
void GlyphMapWidget::set_active_range(Unicode::CodePointRange range)
{
if (m_active_range.first == range.first && m_active_range.last == range.last)
return;
m_active_range = range;
m_glyph_count = range.last - range.first + 1;
set_active_glyph(range.first);
vertical_scrollbar().set_value(0);
recalculate_content_size();
update();
}
void GlyphMapWidget::set_highlight_modifications(bool highlight_modifications)
{
if (m_highlight_modifications == highlight_modifications)
return;
m_highlight_modifications = highlight_modifications;
update();
}
void GlyphMapWidget::set_show_system_emoji(bool show)
{
if (m_show_system_emoji == show)
return;
m_show_system_emoji = show;
update();
}
void GlyphMapWidget::set_glyph_modified(u32 glyph, bool modified)
{
if (modified)
m_modified_glyphs.set(glyph);
else
m_modified_glyphs.remove(glyph);
}
bool GlyphMapWidget::glyph_is_modified(u32 glyph)
{
return m_modified_glyphs.contains(glyph);
}
ErrorOr<void> GlyphMapWidget::initialize(Gfx::Font const* font)
{
if (font)
m_original_font = TRY(font->try_clone());
else
m_original_font = nullptr;
m_modified_glyphs.clear();
AbstractScrollableWidget::set_font(font);
return {};
}
void GlyphMapWidget::enter_event(Core::Event&)
{
set_automatic_scrolling_timer_active(false);
}
void GlyphMapWidget::leave_event(Core::Event&)
{
if (m_in_drag_select)
set_automatic_scrolling_timer_active(true);
}
Optional<UISize> GlyphMapWidget::calculated_min_size() const
{
auto scrollbar = vertical_scrollbar().effective_min_size().height().as_int();
auto min_height = max(font().pixel_size_rounded_up() + m_vertical_spacing, scrollbar);
auto min_width = font().max_glyph_width() + m_horizontal_spacing + width_occupied_by_vertical_scrollbar();
return { { min_width + frame_thickness() * 2, min_height + frame_thickness() * 2 } };
}
}
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