void TBSlider::UpdateHandle()
{
// Calculate the handle position
bool horizontal = m_axis == AXIS_X;
int available_pixels = horizontal ? GetRect().w : GetRect().h;
TBRect rect;
if (m_max - m_min > 0)
{
PreferredSize ps = m_handle.GetPreferredSize();
int handle_pixels = horizontal ? ps.pref_w : ps.pref_h;
m_to_pixel_factor = (double)(available_pixels - handle_pixels) / (m_max - m_min)/*+ 0.5*/;
int pixel_pos = (int)((m_value - m_min) * m_to_pixel_factor);
if (horizontal)
rect.Set(pixel_pos, (GetRect().h - ps.pref_h) / 2, ps.pref_w, ps.pref_h);
else
rect.Set((GetRect().w - ps.pref_w) / 2, GetRect().h - handle_pixels - pixel_pos, ps.pref_w, ps.pref_h);
}
else
m_to_pixel_factor = 0;
m_handle.SetRect(rect);
}
void TBScrollBar::UpdateHandle()
{
// Calculate the mover size and position
bool horizontal = m_axis == AXIS_X;
int available_pixels = horizontal ? GetRect().w : GetRect().h;
int min_thickness_pixels = MIN(GetRect().h, GetRect().w);
int visible_pixels = available_pixels;
if (m_max - m_min > 0 && m_visible > 0)
{
double visible_proportion = m_visible / (m_visible + m_max - m_min);
visible_pixels = (int)(visible_proportion * available_pixels);
// Limit the size of the indicator to the slider thickness so that it doesn't
// become too tiny when the visible proportion is very small.
visible_pixels = MAX(visible_pixels, min_thickness_pixels);
m_to_pixel_factor = (double)(available_pixels - visible_pixels) / (m_max - m_min)/*+ 0.5*/;
}
else
{
m_to_pixel_factor = 0;
// If we can't scroll anything, make the handle invisible
visible_pixels = 0;
}
int pixel_pos = (int)(m_value * m_to_pixel_factor);
TBRect rect;
if (horizontal)
rect.Set(pixel_pos, 0, visible_pixels, GetRect().h);
else
rect.Set(0, pixel_pos, GetRect().w, visible_pixels);
m_handle.SetRect(rect);
}