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VisualBuilder: Use real GWidgets instead of pretend VBWidgets.

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That first design was the wrong idea. Instead, have VBWidget instantiate
a GWidget of the appropriate type and parent it to the VBForm.
We then use a new "greedy hit-testing" mechanism in GWidget to prevent any
mouse events from reaching the VBForm's children.

To paint the grabbers above the child widgets, I added a slightly hackish
but kind of neat second_paint_event() that is called after a widget has
painted all of his children. :^)
This commit is contained in:
Andreas Kling 2019-04-11 03:34:37 +02:00
parent af070324db
commit c6ffb3e2b8
12 changed files with 94 additions and 87 deletions
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7
LibGUI/GWidget.cpp
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@ -115,6 +115,7 @@ void GWidget::handle_paint_event(GPaintEvent& event)
child->event(local_event);
}
}
second_paint_event(event);
}
void GWidget::set_layout(OwnPtr<GLayout>&& layout)
@ -207,6 +208,10 @@ void GWidget::paint_event(GPaintEvent&)
{
}
void GWidget::second_paint_event(GPaintEvent&)
{
}
void GWidget::show_event(GShowEvent&)
{
}
@ -282,6 +287,8 @@ Rect GWidget::screen_relative_rect() const
GWidget::HitTestResult GWidget::hit_test(int x, int y)
{
if (is_greedy_for_hits())
return { this, x, y };
for (int i = children().size() - 1; i >= 0; --i) {
if (!children()[i]->is_widget())
continue;