// RECURSIVE HELPER FUNCTIONS
//
// used in KEY_UP tree nav
UITree *UITreeContainer::findLastOpenNode(UITree *tree) {
if (!tree->hasTreeChildren() || tree->isCollapsed())
return tree;
UITree *t = tree->getTreeChild(tree->getNumTreeChildren()-1);
if (t->isCollapsed() || !t->hasTreeChildren())
return t;
else
return findLastOpenNode(t);
}
void UITreeContainer::onKeyDown(PolyKEY key, wchar_t charCode) {
if (hasFocus) {
// KEYBOARD NAV STUFF
// TODO: add ability to jump to prev/next sibling via holding down some button
//
if (keyNavigable) {
enum { NONE, UP, DOWN } scrollDir = NONE;
UITree *currentSelection = getRootNode()->getSelectedNode();
if (!currentSelection)
return;
UITree *parent = currentSelection->getParent();
// - select parent if currently selected node is first in the tree
// - else, select the last opened node in a sibling above
if (key == KEY_UP) {
if (parent) {
for (int i=0; i < parent->getNumTreeChildren(); i++) {
if (parent->getTreeChild(i) == currentSelection) {
if (i == 0)
parent->setSelected(true);
else
findLastOpenNode((parent->getTreeChild(i-1)))->setSelected(true);
scrollDir = UP;
break;
}
}
}
}
// - select first child of currently selected if expanded and has children
// - or select next sibling
// - else, select the next sibling of some ancestor node
if (key == KEY_DOWN) {
if (currentSelection == getRootNode())
parent = getRootNode();
if (currentSelection->hasTreeChildren() && !currentSelection->isCollapsed()) {
currentSelection->getTreeChild(0)->setSelected(true);
scrollDir = DOWN;
}
else {
for (int i=0; i < parent->getNumTreeChildren(); i++) {
if (parent->getTreeChild(i) == currentSelection) {
if (i == parent->getNumTreeChildren()-1) {
UITree *psib = findNextParentSibling(parent);
if (psib)
psib->setSelected(true);
} else {
parent->getTreeChild(i+1)->setSelected(true);
}
scrollDir = DOWN;
break;
}
}
}
}
if (key == KEY_LEFT) {
if (currentSelection->hasTreeChildren() && !currentSelection->isCollapsed())
currentSelection->toggleCollapsed();
else if (parent) {
parent->setSelected(true);
scrollDir = UP;
}
}
if (key == KEY_RIGHT) {
if (currentSelection->hasTreeChildren()) {
if (currentSelection->isCollapsed())
currentSelection->toggleCollapsed();
}
}
if (scrollDir != NONE)
scrollToNode(getRootNode()->getSelectedNode(), (scrollDir == UP) ? true : false);
}
//
// END KEYBOARD NAV STUFF
}
}
