void DropDownList::OnShowPopup()
{
// Resize the popup to match the size of the list content, and optionally match the button width
UIElement* content = listView_->GetContentElement();
content->UpdateLayout();
const IntVector2& contentSize = content->GetSize();
const IntRect& border = popup_->GetLayoutBorder();
popup_->SetSize(resizePopup_ ? GetWidth() : contentSize.x_ + border.left_ + border.right_, contentSize.y_ + border.top_ +
border.bottom_);
// Check if popup fits below the button. If not, show above instead
bool showAbove = false;
UIElement* root = GetRoot();
if (root)
{
const IntVector2& screenPos = GetScreenPosition();
if (screenPos.y_ + GetHeight() + popup_->GetHeight() > root->GetHeight() && screenPos.y_ - popup_->GetHeight() >= 0)
showAbove = true;
}
SetPopupOffset(0, showAbove ? -popup_->GetHeight() : GetHeight());
}
void ListView::OnKey(int key, int buttons, int qualifiers)
{
// If no selection, can not move with keys
unsigned numItems = GetNumItems();
unsigned selection = GetSelection();
// If either shift or ctrl held down, add to selection if multiselect enabled
bool additive = multiselect_ && qualifiers & (QUAL_SHIFT | QUAL_CTRL);
int delta = M_MAX_INT;
int pageDirection = 1;
if (numItems)
{
if (selection != M_MAX_UNSIGNED && qualifiers & QUAL_CTRL && key == KEY_C)
{
CopySelectedItemsToClipboard();
return;
}
switch (key)
{
case KEY_LEFT:
case KEY_RIGHT:
if (selection != M_MAX_UNSIGNED && hierarchyMode_)
{
Expand(selection, key == KEY_RIGHT);
return;
}
break;
case KEY_RETURN:
case KEY_RETURN2:
case KEY_KP_ENTER:
if (selection != M_MAX_UNSIGNED && hierarchyMode_)
{
ToggleExpand(selection);
return;
}
break;
case KEY_UP:
delta = -1;
break;
case KEY_DOWN:
delta = 1;
break;
case KEY_PAGEUP:
pageDirection = -1;
// Fallthru
case KEY_PAGEDOWN:
{
// Convert page step to pixels and see how many items have to be skipped to reach that many pixels
if (selection == M_MAX_UNSIGNED)
selection = 0; // Assume as if first item is selected
int stepPixels = ((int)(pageStep_ * scrollPanel_->GetHeight())) - contentElement_->GetChild(selection)->GetHeight();
unsigned newSelection = selection;
unsigned okSelection = selection;
unsigned invisible = 0;
while (newSelection < numItems)
{
UIElement* item = GetItem(newSelection);
int height = 0;
if (item->IsVisible())
{
height = item->GetHeight();
okSelection = newSelection;
}
else
++invisible;
if (stepPixels < height)
break;
stepPixels -= height;
newSelection += pageDirection;
}
delta = okSelection - selection - pageDirection * invisible;
}
break;
case KEY_HOME:
delta = -(int)GetNumItems();
break;
case KEY_END:
delta = GetNumItems();
break;
default: break;
}
}
if (delta != M_MAX_INT)
{
ChangeSelection(delta, additive);
return;
}
using namespace UnhandledKey;
VariantMap& eventData = GetEventDataMap();
eventData[P_ELEMENT] = this;
eventData[P_KEY] = key;
eventData[P_BUTTONS] = buttons;
eventData[P_QUALIFIERS] = qualifiers;
SendEvent(E_UNHANDLEDKEY, eventData);
}