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Add a basic Listbox widget.

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This commit is contained in:
Andreas Kling 2018-10-13 00:20:44 +02:00
parent 8016139430
commit f20977c65f
5 changed files with 93 additions and 2 deletions
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58
Widgets/ListBox.cpp Normal file
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#include "ListBox.h"
#include "Painter.h"
#include "Font.h"
ListBox::ListBox(Widget* parent)
: Widget(parent)
{
}
ListBox::~ListBox()
{
}
unsigned ListBox::itemHeight() const
{
return Font::defaultFont().glyphHeight() + 2;
}
void ListBox::onPaint(PaintEvent&)
{
Painter painter(*this);
painter.fillRect(rect(), Color::White);
painter.drawRect(rect(), Color::Black);
for (unsigned i = m_scrollOffset; i < m_items.size(); ++i) {
Rect itemRect(1, 1 + (i * itemHeight()), width() - 2, itemHeight());
Rect textRect(itemRect.x() + 1, itemRect.y() + 1, itemRect.width() - 2, itemRect.height() - 2);
Color itemTextColor = foregroundColor();
if (m_selectedIndex == i) {
painter.fillRect(itemRect, Color(0, 32, 128));
itemTextColor = Color::White;
}
painter.drawText(textRect, m_items[i], Painter::TextAlignment::TopLeft, itemTextColor);
}
}
void ListBox::onMouseDown(MouseEvent& event)
{
printf("ListBox::onMouseDown %d,%d\n", event.x(), event.y());
for (unsigned i = m_scrollOffset; i < m_items.size(); ++i) {
Rect itemRect(1, 1 + (i * itemHeight()), width() - 2, itemHeight());
if (itemRect.contains(event.position())) {
m_selectedIndex = i;
printf("ListBox: selected item %u (\"%s\")\n", i, m_items[i].characters());
update();
return;
}
}
}
void ListBox::addItem(String&& item)
{
m_items.append(std::move(item));
if (m_selectedIndex == -1)
m_selectedIndex = 0;
}