src/ui/list_box.cpp - main - Mr.Stalin/FreeFT

src/ui/list_box.cpp
142 строки4 KB
Krzysztof Jakubowski
Updated libfwk to latest version (2025.01) PART 1 (#9)
08 янв 2025, 23:03
08 янв 2025, 23:037639343
// Copyright (C) Krzysztof Jakubowski <nadult@fastmail.fm>
// This file is part of FreeFT. See license.txt for details.

#include "ui/list_box.h"

namespace ui {

ListBox::ListBox(const IRect &rect, FColor color)
	: Window(rect, color), m_over_id(-1), m_dragging_id(-1),
	  m_font(res::getFont(WindowStyle::fonts[0])) {
	m_line_height = m_font.lineHeight();
}

void ListBox::drawContents(Canvas2D &out) const {
	int2 offset = innerOffset();
	int2 vis_entries = visibleEntriesIds();

	for(int n = vis_entries.x; n < vis_entries.y; n++) {
		const Entry &entry = m_entries[n];
		IRect rect = entryRect(n) - offset;

		out.addSegment(int2(rect.x(), rect.ey()), rect.max(), WindowStyle::gui_medium);

		FColor col = ColorId::transparent;

		if((m_over_id == n && m_dragging_id == -1) || m_dragging_id == n)
			col = WindowStyle::gui_medium;
		if((m_dragging_id == n && m_over_id == n) || entry.is_selected)
			col = WindowStyle::gui_light;

		if(col.a > 0.0f)
			out.addFilledRect(rect, col);
	}

	if(isPopup())
		out.addRect(IRect(1, 0, width(), height() - 1), backgroundColor());

	for(int n = vis_entries.x; n < vis_entries.y; n++) {
		int2 pos = int2(0, m_line_height * n) - offset;
		FontStyle style{IColor(m_entries[n].color), ColorId::black};
		m_font.draw(out, (float2)(pos + int2(5, 0)), style, m_entries[n].text);
	}
}

int2 ListBox::visibleEntriesIds() const {
	int2 offset = innerOffset();
	int begin = max(0, offset.y / m_line_height);
	int end =
		min((offset.y + rect().height() + m_line_height) / m_line_height, (int)m_entries.size());

	return int2(begin, end);
}

int ListBox::entryId(int2 pos) const {
	int2 vis_entries = visibleEntriesIds();
	pos += innerOffset();

	for(int n = vis_entries.x; n < vis_entries.y; n++)
		if(entryRect(n).containsCell(pos))
			return n;
	return -1;
}

bool ListBox::onEvent(const Event &ev) {
	if(ev.type == Event::escape && isPopup()) {
		close(0);
		return true;
	}

	return false;
}

void ListBox::onInput(const InputState &state) {
	m_over_id = entryId(state.mousePos() - clippedRect().min());
}

bool ListBox::onMouseDrag(const InputState &, int2 start, int2 end, int key, int is_final) {
	if(key == 0) {
		m_over_id = entryId(end);
		m_dragging_id = entryId(start);

		if(is_final == 1 && m_over_id == m_dragging_id) {
			bool do_select = localRect().containsCell(end) &&
							 (!isPopup() || (m_over_id >= 0 && m_over_id < size()));

			if(do_select)
				selectEntry(m_over_id);
			sendEvent(this, Event::element_clicked, m_over_id);
			if(isPopup())
				close(do_select ? 1 : 0);
		}
		if(is_final)
			m_dragging_id = -1;

		return true;
	}

	return false;
}

IRect ListBox::entryRect(int entry_id) const {
	int pos = entry_id * m_line_height;
	return IRect(0, pos, rect().width(), pos + m_line_height);
}

void ListBox::addEntry(const char *text, FColor col) {
	m_entries.push_back(Entry{col, text, false});
	update();
}

int ListBox::findEntry(const char *text) const {
	for(int n = 0; n < (int)m_entries.size(); n++)
		if(m_entries[n].text == text)
			return n;
	return -1;
}

void ListBox::clear() {
	m_entries.clear();
	update();
}

void ListBox::update() {
	int2 size(rect().width(), m_font.lineHeight() * (int)m_entries.size());
	DASSERT(size.x >= 0 && size.y >= 0);
	setInnerRect(IRect(0, 0, size.x, size.y));
}

int ListBox::selectedId() const {
	for(int n = 0; n < (int)m_entries.size(); n++)
		if(m_entries[n].is_selected)
			return n;
	return -1;
}

void ListBox::selectEntry(int id) {
	for(int n = 0; n < (int)m_entries.size(); n++)
		m_entries[n].is_selected = n == id;
	sendEvent(this, Event::element_selected, id < 0 || id >= (int)m_entries.size() ? -1 : id);
}

}