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More work on the variable-width font support.

Katica is now the default system font, and it looks quite nice. :^)
I'm gonna need to refine the GTextBox movement stuff eventually,
but it works well-enough for basic editing now.
This commit is contained in:
Andreas Kling 2019-03-06 14:06:40 +01:00
parent e53cef02d5
commit 66a5ddd94a
12 changed files with 125 additions and 30 deletions

View file

@ -24,8 +24,13 @@ GFontDatabase::GFontDatabase()
if (de->d_name[0] == '.')
continue;
auto path = String::format("/res/fonts/%s", de->d_name);
if (auto font = Font::load_from_file(path))
m_name_to_path.set(font->name(), path);
if (auto font = Font::load_from_file(path)) {
Metadata metadata;
metadata.path = path;
metadata.glyph_height = font->glyph_height();
metadata.is_fixed_width = font->is_fixed_width();
m_name_to_metadata.set(font->name(), move(metadata));
}
}
closedir(dirp);
}
@ -36,15 +41,23 @@ GFontDatabase::~GFontDatabase()
void GFontDatabase::for_each_font(Function<void(const String&)> callback)
{
for (auto& it : m_name_to_path) {
for (auto& it : m_name_to_metadata) {
callback(it.key);
}
}
void GFontDatabase::for_each_fixed_width_font(Function<void(const String&)> callback)
{
for (auto& it : m_name_to_metadata) {
if (it.value.is_fixed_width)
callback(it.key);
}
}
RetainPtr<Font> GFontDatabase::get_by_name(const String& name)
{
auto it = m_name_to_path.find(name);
if (it == m_name_to_path.end())
auto it = m_name_to_metadata.find(name);
if (it == m_name_to_metadata.end())
return nullptr;
return Font::load_from_file((*it).value);
return Font::load_from_file((*it).value.path);
}

View file

@ -12,10 +12,17 @@ public:
RetainPtr<Font> get_by_name(const String&);
void for_each_font(Function<void(const String&)>);
void for_each_fixed_width_font(Function<void(const String&)>);
private:
GFontDatabase();
~GFontDatabase();
HashMap<String, String> m_name_to_path;
struct Metadata {
String path;
bool is_fixed_width;
int glyph_height;
};
HashMap<String, Metadata> m_name_to_metadata;
};

View file

@ -21,12 +21,58 @@ void GTextBox::set_text(const String& text)
return;
m_text = text;
m_cursor_position = m_text.length();
scroll_cursor_into_view(HorizontalDirection::Right);
update();
}
void GTextBox::scroll_cursor_into_view(HorizontalDirection direction)
{
if (visible_content_rect().contains(cursor_content_position()))
return;
int total_text_width = font().width(m_text);
dbgprintf("total_text_width = %d, visible_content width = %d\n", total_text_width, visible_content_rect().width());
if (total_text_width < visible_content_rect().width()) {
m_scroll_offset = 0;
return;
}
if (direction == HorizontalDirection::Left) {
dbgprintf("Left, orig offset = %d\n", m_scroll_offset);
m_scroll_offset = cursor_content_position().x();
int offset_into_visible = m_scroll_offset - visible_content_rect().x();
if (offset_into_visible < font().glyph_width(' '))
m_scroll_offset -= width() / 2;
} else {
m_scroll_offset = cursor_content_position().x() - visible_content_rect().width();
dbgprintf("Right, orig offset = %d\n", m_scroll_offset);
int offset_into_visible = m_scroll_offset - visible_content_rect().x();
if (offset_into_visible > width() / 4) {
dbgprintf("Right, adjust offset = %d\n", m_scroll_offset);
m_scroll_offset += width() / 2;
}
}
if (m_scroll_offset < 0)
m_scroll_offset = 0;
if (m_scroll_offset > total_text_width)dbgprintf("Right, adjust offset = %d\n", m_scroll_offset);
m_scroll_offset = total_text_width - width();
}
Rect GTextBox::visible_content_rect() const
{
if (rect().is_empty())
return { };
return { m_scroll_offset, 0, rect().shrunken(6, 6).width(), rect().shrunken(6, 6).height() };
}
Point GTextBox::cursor_content_position() const
{
int x = 0;
for (int i = 0; i < m_cursor_position; ++i)
x += font().glyph_width(m_text[i]) + font().glyph_spacing();
return { x, 0 };
}
void GTextBox::paint_event(GPaintEvent& event)
{
ASSERT(font().is_fixed_width());
Painter painter(*this);
painter.set_clip_rect(event.rect());
@ -39,27 +85,25 @@ void GTextBox::paint_event(GPaintEvent& event)
Rect inner_rect = rect();
inner_rect.shrink(6, 6);
ssize_t max_chars_to_paint = inner_rect.width() / font().min_glyph_width();
painter.set_clip_rect(inner_rect);
painter.translate(-m_scroll_offset, 0);
int first_visible_char = max((int)m_cursor_position - (int)max_chars_to_paint, 0);
ssize_t chars_to_paint = min(m_text.length() - first_visible_char, max_chars_to_paint);
int y = inner_rect.center().y() - font().glyph_height() / 2;
int space_width = font().glyph_width(' ');
int space_width = font().glyph_width(' ') + font().glyph_spacing();
int x = inner_rect.x();
for (ssize_t i = 0; i < chars_to_paint; ++i) {
char ch = m_text[first_visible_char + i];
for (int i = 0; i < m_text.length(); ++i) {
char ch = m_text[i];
if (ch == ' ') {
x += space_width;
continue;
}
painter.draw_glyph({x, y}, ch, Color::Black);
x += font().glyph_width(ch);
x += font().glyph_width(ch) + font().glyph_spacing();
}
if (is_focused() && m_cursor_blink_state) {
int visible_cursor_position = m_cursor_position - first_visible_char;
Rect cursor_rect(inner_rect.x() + visible_cursor_position * font().glyph_width('x'), inner_rect.y(), 1, inner_rect.height());
Rect cursor_rect(inner_rect.x() + cursor_content_position().x(), inner_rect.y(), 1, inner_rect.height());
painter.fill_rect(cursor_rect, foreground_color());
}
}
@ -76,6 +120,7 @@ void GTextBox::handle_backspace()
if (m_text.length() == 1) {
m_text = String::empty();
m_cursor_position = 0;
m_scroll_offset = 0;
if (on_change)
on_change(*this);
update();
@ -90,6 +135,7 @@ void GTextBox::handle_backspace()
m_text = move(new_text);
--m_cursor_position;
scroll_cursor_into_view(HorizontalDirection::Left);
if (on_change)
on_change(*this);
update();
@ -99,14 +145,18 @@ void GTextBox::keydown_event(GKeyEvent& event)
{
switch (event.key()) {
case KeyCode::Key_Left:
if (m_cursor_position)
if (m_cursor_position) {
--m_cursor_position;
scroll_cursor_into_view(HorizontalDirection::Left);
}
m_cursor_blink_state = true;
update();
return;
case KeyCode::Key_Right:
if (m_cursor_position < m_text.length())
if (m_cursor_position < m_text.length()) {
++m_cursor_position;
scroll_cursor_into_view(HorizontalDirection::Right);
}
m_cursor_blink_state = true;
update();
return;
@ -130,6 +180,7 @@ void GTextBox::keydown_event(GKeyEvent& event)
m_text = move(new_text);
++m_cursor_position;
scroll_cursor_into_view(HorizontalDirection::Right);
if (on_change)
on_change(*this);
update();
@ -156,3 +207,8 @@ void GTextBox::focusout_event(GEvent&)
{
stop_timer();
}
void GTextBox::resize_event(GResizeEvent&)
{
scroll_cursor_into_view(HorizontalDirection::Right);
}

View file

@ -22,12 +22,17 @@ private:
virtual void timer_event(GTimerEvent&) override;
virtual void focusin_event(GEvent&) override;
virtual void focusout_event(GEvent&) override;
virtual void resize_event(GResizeEvent&) override;
virtual bool accepts_focus() const override { return true; }
Point cursor_content_position() const;
Rect visible_content_rect() const;
void handle_backspace();
void scroll_cursor_into_view(HorizontalDirection);
String m_text;
int m_cursor_position { 0 };
int m_scroll_offset { 0 };
bool m_cursor_blink_state { false };
};

View file

@ -14,6 +14,8 @@ class GWindow;
enum class SizePolicy { Fixed, Fill };
enum class Orientation { Horizontal, Vertical };
enum class HorizontalDirection { Left, Right };
enum class VerticalDirection { Up, Down };
class GWidget : public GObject {
public: