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) {
SetOrigin(i - items_visible);
if (origin > 0 || i >= items_visible)
SetPixelPan(((items_visible + 1) * item_height - GetHeight()) % item_height);
}
}
void
ListControl::EnsureVisible(unsigned i)
{
assert(i < length);
if (origin > i+items_visible/2) { // big jump up
SetOrigin(i<items_visible/2 ? 0 : i-items_visible/2 );
} else if (origin > i || (origin == i && pixel_pan > 0)) { //small jump up
SetOrigin(i);
SetPixelPan(0);
} else if (origin + items_visible+items_visible/2 < i){ //big jump down
if (UsePixelPan()) {
if(i+items_visible/2 > length)
SetOrigin(length - items_visible);
else
SetOrigin(i-items_visible/2);
if (origin > 0 || i >= items_visible)
SetPixelPan(((items_visible + 1) * item_height - GetHeight()) % item_height);
} else { // small jump down
/* no pixel panning on e-paper screens to avoid tearing */
if(i+items_visible/2 > length)
SetOrigin(length - items_visible);
else
SetOrigin(i-items_visible/2);
}
} 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);
}
}
}
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);
}
}
}
void SetPixelOrigin(int pixel_origin) {
int max = length * item_height - get_height();
if (pixel_origin > max)
pixel_origin = max;
if (pixel_origin < 0)
pixel_origin = 0;
SetOrigin(pixel_origin / item_height);
SetPixelPan(pixel_origin % item_height);
}
void
ListControl::SetPixelOrigin(int pixel_origin)
{
int max = length * item_height - GetHeight();
if (pixel_origin > max)
pixel_origin = max;
if (pixel_origin < 0)
pixel_origin = 0;
SetOrigin(pixel_origin / item_height);
/* no pixel panning on e-paper screens to avoid tearing */
SetPixelPan(UsePixelPan() ? pixel_origin % item_height : 0);
}