void tscrollbar_container::set_visible_area(const SDL_Rect& area)
{
// Inherited.
tcontainer_::set_visible_area(area);
// Now get the visible part of the content.
content_visible_area_ = intersect_rects(area, content_->get_rect());
content_grid_->set_visible_area(content_visible_area_);
}
void twidget::set_visible_area(const SDL_Rect& area)
{
clip_rect_ = intersect_rects(area, get_rect());
if(clip_rect_ == get_rect()) {
drawing_action_ = DRAWN;
} else if(clip_rect_ == empty_rect) {
drawing_action_ = NOT_DRAWN;
} else {
drawing_action_ = PARTLY_DRAWN;
}
}
void twidget::set_visible_rectangle(const SDL_Rect& rectangle)
{
clipping_rectangle_ = intersect_rects(rectangle, get_rectangle());
if(clipping_rectangle_ == get_rectangle()) {
redraw_action_ = tredraw_action::full;
} else if(clipping_rectangle_ == empty_rect) {
redraw_action_ = tredraw_action::none;
} else {
redraw_action_ = tredraw_action::partly;
}
}
SDL_Rect twidget::calculate_clipping_rectangle(SDL_Surface* surf, const int x_offset, const int y_offset)
{
SDL_Rect clip_rect = clip_rect_;
clip_rect.x += x_offset;
clip_rect.y += y_offset;
SDL_Rect surf_clip_rect;
SDL_GetClipRect(surf, &surf_clip_rect);
if (surf_clip_rect.w != surf->w || surf_clip_rect.h != surf->h) {
return intersect_rects(clip_rect, surf_clip_rect);
}
return clip_rect;
}
