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LibGUI: Start working on a GScrollBar.

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This widget is far from finished, but it's off to a good start.
Also added a GResizeEvent and GWidget::resize_event() so that widgets
can react to being resized.
This commit is contained in:
Andreas Kling 2019-02-09 11:19:38 +01:00
parent 4d5fe39494
commit 1f355f2a79
11 changed files with 231 additions and 5 deletions
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27
LibGUI/GWidget.cpp
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@ -22,7 +22,10 @@ void GWidget::set_relative_rect(const Rect& rect)
{
if (rect == m_relative_rect)
return;
// FIXME: Make some kind of event loop driven ResizeEvent?
if (m_relative_rect.size() != rect.size()) {
auto event = make<GResizeEvent>(m_relative_rect.size(), rect.size());
GEventLoop::main().post_event(this, move(event));
}
m_relative_rect = rect;
update();
}
@ -37,7 +40,9 @@ void GWidget::event(GEvent& event)
switch (event.type()) {
case GEvent::Paint:
m_has_pending_paint_event = false;
return paint_event(static_cast<GPaintEvent&>(event));
return handle_paint_event(static_cast<GPaintEvent&>(event));
case GEvent::Resize:
return resize_event(static_cast<GResizeEvent&>(event));
case GEvent::FocusIn:
return focusin_event(event);
case GEvent::FocusOut:
@ -63,21 +68,33 @@ void GWidget::event(GEvent& event)
}
}
void GWidget::paint_event(GPaintEvent& event)
void GWidget::handle_paint_event(GPaintEvent& event)
{
if (fill_with_background_color()) {
Painter painter(*this);
painter.fill_rect(event.rect(), background_color());
}
paint_event(event);
for (auto* ch : children()) {
auto* child = (GWidget*)ch;
if (child->relative_rect().intersects(event.rect())) {
// FIXME: Pass localized rect?
child->event(event);
auto local_rect = event.rect();
local_rect.intersect(child->relative_rect());
local_rect.move_by(-child->relative_rect().x(), -child->relative_rect().y());
GPaintEvent local_event(local_rect);
child->event(local_event);
}
}
}
void GWidget::resize_event(GResizeEvent&)
{
}
void GWidget::paint_event(GPaintEvent&)
{
}
void GWidget::show_event(GShowEvent&)
{
}