bool
ListControl::OnTimer(WindowTimer &timer)
{
if (timer == kinetic_timer) {
assert(UsePixelPan());
if (kinetic.IsSteady()) {
kinetic_timer.Cancel();
} else
SetPixelOrigin(kinetic.GetPosition());
return true;
}
return PaintWindow::OnTimer(timer);
}
void
ListControl::EnsureVisible(unsigned i)
{
assert(i < length);
if (origin > i || (origin == i && pixel_pan > 0)) {
SetOrigin(i);
SetPixelPan(0);
} else if (origin + items_visible <= i) {
if (UsePixelPan()) {
SetOrigin(i - items_visible);
if (origin > 0 || i >= items_visible)
SetPixelPan(((items_visible + 1) * item_height - GetHeight()) % item_height);
} else {
/* no pixel panning on e-paper screens to avoid tearing */
SetOrigin(i + 1 - items_visible);
}
}
}
bool
ListControl::OnMouseDown(PixelScalar x, PixelScalar y)
{
// End any previous drag
scroll_bar.DragEnd(this);
drag_end();
#ifndef _WIN32_WCE
kinetic_timer.Cancel();
#endif
RasterPoint Pos;
Pos.x = x;
Pos.y = y;
// If possible -> Give focus to the Control
const bool had_focus = !HasCursorKeys() || HasFocus();
if (!had_focus)
SetFocus();
if (scroll_bar.IsInsideSlider(Pos)) {
// if click is on scrollbar handle
// -> start mouse drag
scroll_bar.DragBegin(this, Pos.y);
} else if (scroll_bar.IsInside(Pos)) {
// if click in scroll bar up/down/pgup/pgdn
if (scroll_bar.IsInsideUpArrow(Pos.y))
// up
MoveOrigin(-1);
else if (scroll_bar.IsInsideDownArrow(Pos.y))
// down
MoveOrigin(1);
else if (scroll_bar.IsAboveSlider(Pos.y))
// page up
MoveOrigin(-(int)items_visible);
else if (scroll_bar.IsBelowSlider(Pos.y))
// page down
MoveOrigin(items_visible);
} else {
// if click in ListBox area
// -> select appropriate item
int index = ItemIndexAt(y);
// If mouse was clicked outside the list items -> cancel
if (index < 0)
return false;
drag_y = GetPixelOrigin() + y;
drag_y_window = y;
if (had_focus && (unsigned)index == GetCursorIndex() &&
CanActivateItem()) {
drag_mode = DragMode::CURSOR;
Invalidate_item(cursor);
} else {
// If item was not selected before
// -> select it
SetCursorIndex(index);
drag_mode = DragMode::SCROLL;
}
#ifndef _WIN32_WCE
if (UsePixelPan())
kinetic.MouseDown(GetPixelOrigin());
#endif
SetCapture();
}
return true;
}
