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GTextEditor: Refactor selection into a GTextRange class.

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This is a bit more expressive than "selection start + current cursor".
This commit is contained in:
Andreas Kling 2019-03-08 18:28:24 +01:00
parent f40d11f06d
commit 032549d7bf
3 changed files with 95 additions and 51 deletions
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107
LibGUI/GTextEditor.cpp
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@ -110,9 +110,9 @@ void GTextEditor::mousedown_event(GMouseEvent& event)
if (event.button() == GMouseButton::Left) {
if (event.modifiers() & Mod_Shift) {
if (!has_selection())
m_selection_start = m_cursor;
m_selection.set(m_cursor, { });
} else {
m_selection_start = { };
m_selection.clear();
}
m_in_drag_select = true;
@ -122,9 +122,12 @@ void GTextEditor::mousedown_event(GMouseEvent& event)
if (!(event.modifiers() & Mod_Shift)) {
if (!has_selection())
m_selection_start = m_cursor;
m_selection.set(m_cursor, { });
}
if (m_selection.start().is_valid())
m_selection.set_end(m_cursor);
// FIXME: Only update the relevant rects.
update();
return;
@ -146,6 +149,7 @@ void GTextEditor::mousemove_event(GMouseEvent& event)
{
if (m_in_drag_select) {
set_cursor(text_position_at(event.position()));
m_selection.set_end(m_cursor);
update();
return;
}
@ -184,11 +188,8 @@ void GTextEditor::paint_event(GPaintEvent& event)
int first_visible_line = text_position_at(event.rect().top_left()).line();
int last_visible_line = text_position_at(event.rect().bottom_right()).line();
auto normalized_selection_start = m_selection_start;
auto normalized_selection_end = m_cursor;
if (m_cursor < m_selection_start)
swap(normalized_selection_start, normalized_selection_end);
bool has_selection = m_selection_start.is_valid();
auto selection = normalized_selection();
bool has_selection = selection.is_valid();
painter.set_font(Font::default_font());
for (int i = first_visible_line; i <= last_visible_line; ++i) {
@ -214,10 +215,10 @@ void GTextEditor::paint_event(GPaintEvent& event)
if (i == m_cursor.line())
painter.fill_rect(line_rect, Color(230, 230, 230));
painter.draw_text(line_rect, line.characters(), line.length(), TextAlignment::CenterLeft, Color::Black);
bool line_has_selection = has_selection && i >= normalized_selection_start.line() && i <= normalized_selection_end.line();
bool line_has_selection = has_selection && i >= selection.start().line() && i <= selection.end().line();
if (line_has_selection) {
int selection_start_column_on_line = normalized_selection_start.line() == i ? normalized_selection_start.column() : 0;
int selection_end_column_on_line = normalized_selection_end.line() == i ? normalized_selection_end.column() : line.length();
int selection_start_column_on_line = selection.start().line() == i ? selection.start().column() : 0;
int selection_end_column_on_line = selection.end().line() == i ? selection.end().column() : line.length();
int selection_left = selection_start_column_on_line * font().glyph_width('x');
int selection_right = line_rect.left() + selection_end_column_on_line * font().glyph_width('x');
Rect selection_rect { selection_left, line_rect.y(), selection_right - selection_left, line_rect.height() };
@ -244,13 +245,13 @@ void GTextEditor::paint_event(GPaintEvent& event)
void GTextEditor::toggle_selection_if_needed_for_event(const GKeyEvent& event)
{
if (event.shift() && !m_selection_start.is_valid()) {
m_selection_start = m_cursor;
if (event.shift() && !m_selection.is_valid()) {
m_selection.set(m_cursor, { });
update();
return;
}
if (!event.shift() && m_selection_start.is_valid()) {
m_selection_start = { };
if (!event.shift() && m_selection.is_valid()) {
m_selection.clear();
update();
return;
}
@ -264,6 +265,8 @@ void GTextEditor::keydown_event(GKeyEvent& event)
int new_column = min(m_cursor.column(), m_lines[new_line]->length());
toggle_selection_if_needed_for_event(event);
set_cursor(new_line, new_column);
if (m_selection.start().is_valid())
m_selection.set_end(m_cursor);
}
return;
}
@ -273,6 +276,8 @@ void GTextEditor::keydown_event(GKeyEvent& event)
int new_column = min(m_cursor.column(), m_lines[new_line]->length());
toggle_selection_if_needed_for_event(event);
set_cursor(new_line, new_column);
if (m_selection.start().is_valid())
m_selection.set_end(m_cursor);
}
return;
}
@ -282,6 +287,8 @@ void GTextEditor::keydown_event(GKeyEvent& event)
int new_column = min(m_cursor.column(), m_lines[new_line]->length());
toggle_selection_if_needed_for_event(event);
set_cursor(new_line, new_column);
if (m_selection.start().is_valid())
m_selection.set_end(m_cursor);
}
return;
}
@ -291,6 +298,8 @@ void GTextEditor::keydown_event(GKeyEvent& event)
int new_column = min(m_cursor.column(), m_lines[new_line]->length());
toggle_selection_if_needed_for_event(event);
set_cursor(new_line, new_column);
if (m_selection.start().is_valid())
m_selection.set_end(m_cursor);
}
return;
}
@ -299,6 +308,8 @@ void GTextEditor::keydown_event(GKeyEvent& event)
int new_column = m_cursor.column() - 1;
toggle_selection_if_needed_for_event(event);
set_cursor(m_cursor.line(), new_column);
if (m_selection.start().is_valid())
m_selection.set_end(m_cursor);
}
return;
}
@ -307,32 +318,44 @@ void GTextEditor::keydown_event(GKeyEvent& event)
int new_column = m_cursor.column() + 1;
toggle_selection_if_needed_for_event(event);
set_cursor(m_cursor.line(), new_column);
if (m_selection.start().is_valid())
m_selection.set_end(m_cursor);
}
return;
}
if (!event.ctrl() && event.key() == KeyCode::Key_Home) {
toggle_selection_if_needed_for_event(event);
set_cursor(m_cursor.line(), 0);
if (m_selection.start().is_valid())
m_selection.set_end(m_cursor);
return;
}
if (!event.ctrl() && event.key() == KeyCode::Key_End) {
toggle_selection_if_needed_for_event(event);
set_cursor(m_cursor.line(), current_line().length());
if (m_selection.start().is_valid())
m_selection.set_end(m_cursor);
return;
}
if (event.ctrl() && event.key() == KeyCode::Key_Home) {
toggle_selection_if_needed_for_event(event);
set_cursor(0, 0);
if (m_selection.start().is_valid())
m_selection.set_end(m_cursor);
return;
}
if (event.ctrl() && event.key() == KeyCode::Key_End) {
toggle_selection_if_needed_for_event(event);
set_cursor(line_count() - 1, m_lines[line_count() - 1]->length());
if (m_selection.start().is_valid())
m_selection.set_end(m_cursor);
return;
}
if (event.modifiers() == Mod_Ctrl && event.key() == KeyCode::Key_A) {
m_selection_start = { 0, 0 };
set_cursor(line_count() - 1, m_lines[line_count() - 1]->length());
GTextPosition start_of_document { 0, 0 };
GTextPosition end_of_document { line_count() - 1, m_lines[line_count() - 1]->length() };
m_selection.set(start_of_document, end_of_document);
set_cursor(end_of_document);
update();
return;
}
@ -650,19 +673,14 @@ String GTextEditor::selected_text() const
if (!has_selection())
return { };
auto normalized_selection_start = m_selection_start;
auto normalized_selection_end = m_cursor;
if (m_cursor < m_selection_start)
swap(normalized_selection_start, normalized_selection_end);
auto selection = normalized_selection();
StringBuilder builder;
for (int i = normalized_selection_start.line(); i <= normalized_selection_end.line(); ++i) {
for (int i = selection.start().line(); i <= selection.end().line(); ++i) {
auto& line = *m_lines[i];
int selection_start_column_on_line = normalized_selection_start.line() == i ? normalized_selection_start.column() : 0;
int selection_end_column_on_line = normalized_selection_end.line() == i ? normalized_selection_end.column() : line.length();
int selection_start_column_on_line = selection.start().line() == i ? selection.start().column() : 0;
int selection_end_column_on_line = selection.end().line() == i ? selection.end().column() : line.length();
builder.append(line.characters() + selection_start_column_on_line, selection_end_column_on_line - selection_start_column_on_line);
if (i != normalized_selection_end.line())
if (i != selection.end().line())
builder.append('\n');
}
@ -674,26 +692,23 @@ void GTextEditor::delete_selection()
if (!has_selection())
return;
auto normalized_selection_start = m_selection_start;
auto normalized_selection_end = m_cursor;
if (m_cursor < m_selection_start)
swap(normalized_selection_start, normalized_selection_end);
auto selection = normalized_selection();
// First delete all the lines in between the first and last one.
for (int i = normalized_selection_start.line() + 1; i < normalized_selection_end.line();) {
for (int i = selection.start().line() + 1; i < selection.end().line();) {
m_lines.remove(i);
normalized_selection_end.set_line(normalized_selection_end.line() - 1);
selection.end().set_line(selection.end().line() - 1);
}
if (normalized_selection_start.line() == normalized_selection_end.line()) {
if (selection.start().line() == selection.end().line()) {
// Delete within same line.
auto& line = *m_lines[normalized_selection_start.line()];
bool whole_line_is_selected = normalized_selection_start.column() == 0 && normalized_selection_end.column() == line.length();
auto& line = *m_lines[selection.start().line()];
bool whole_line_is_selected = selection.start().column() == 0 && selection.end().column() == line.length();
if (whole_line_is_selected) {
line.clear();
} else {
auto before_selection = String(line.characters(), line.length()).substring(0, normalized_selection_start.column());
auto after_selection = String(line.characters(), line.length()).substring(normalized_selection_end.column(), line.length() - normalized_selection_end.column());
auto before_selection = String(line.characters(), line.length()).substring(0, selection.start().column());
auto after_selection = String(line.characters(), line.length()).substring(selection.end().column(), line.length() - selection.end().column());
StringBuilder builder(before_selection.length() + after_selection.length());
builder.append(before_selection);
builder.append(after_selection);
@ -701,23 +716,23 @@ void GTextEditor::delete_selection()
}
} else {
// Delete across a newline, merging lines.
ASSERT(normalized_selection_start.line() == normalized_selection_end.line() - 1);
auto& first_line = *m_lines[normalized_selection_start.line()];
auto& second_line = *m_lines[normalized_selection_end.line()];
auto before_selection = String(first_line.characters(), first_line.length()).substring(0, normalized_selection_start.column());
auto after_selection = String(second_line.characters(), second_line.length()).substring(normalized_selection_end.column(), second_line.length() - normalized_selection_end.column());
ASSERT(selection.start().line() == selection.end().line() - 1);
auto& first_line = *m_lines[selection.start().line()];
auto& second_line = *m_lines[selection.end().line()];
auto before_selection = String(first_line.characters(), first_line.length()).substring(0, selection.start().column());
auto after_selection = String(second_line.characters(), second_line.length()).substring(selection.end().column(), second_line.length() - selection.end().column());
StringBuilder builder(before_selection.length() + after_selection.length());
builder.append(before_selection);
builder.append(after_selection);
first_line.set_text(builder.to_string());
m_lines.remove(normalized_selection_end.line());
m_lines.remove(selection.end().line());
}
if (m_lines.is_empty())
m_lines.append(make<Line>());
m_selection_start = { };
set_cursor(normalized_selection_start);
m_selection.clear();
set_cursor(selection.start());
update();
}