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Don't scroll invalid areas in Widget::scrollRegion()

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This commit is contained in:
David Capello 2015-12-28 13:37:01 -03:00
parent 5074ef2d68
commit 199a3db278
1 changed files with 14 additions and 6 deletions
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20
src/ui/widget.cpp
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@ -1041,17 +1041,25 @@ void Widget::scrollRegion(const Region& region, const Point& delta)
if (delta.x == 0 && delta.y == 0)
return;
Region reg2 = region;
reg2.offset(delta);
reg2.createIntersection(reg2, region);
// The movable region includes the given region in the "region"
// parameter without the invalid widget region (i.e. m_updateRegion,
// as we cannot move invalid/non-updated screen areas), and
// intersecting with the moved "region" area (so we don't overlap
// regions outside the "region" parameters)
Region movable = region;
movable.createSubtraction(movable, m_updateRegion);
movable.offset(delta);
movable.createIntersection(movable, region);
// Now we invalidate the given "region" without the moved region
// ("movable" variable).
m_updateRegion.createUnion(m_updateRegion, region);
m_updateRegion.createSubtraction(m_updateRegion, reg2);
m_updateRegion.createSubtraction(m_updateRegion, movable);
mark_dirty_flag(this);
// Move screen pixels
reg2.offset(-delta);
ui::move_region(manager(), reg2, delta.x, delta.y);
movable.offset(-delta);
ui::move_region(manager(), movable, delta.x, delta.y);
// Generate the kPaintMessage messages for the widget's m_updateRegion
flushRedraw();