private void addPlainAction(RuleAction menuAction) {
final ToolItem button = new ToolItem(mLayoutToolBar, SWT.PUSH);
URL iconUrl = menuAction.getIconUrl();
String title = menuAction.getTitle();
if (iconUrl != null) {
button.setImage(IconFactory.getInstance().getIcon(iconUrl));
button.setToolTipText(title);
} else {
button.setText(title);
}
button.setData(menuAction);
button.addSelectionListener(
new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
RuleAction menuAction = (RuleAction) button.getData();
menuAction
.getCallback()
.action(menuAction, getSelectedNodes(), menuAction.getId(), false);
updateSelection();
}
});
}
/**
* Attempts to update the existing toolbar actions, if the action list is similar to the current
* list. Returns false if this cannot be done and the contents must be replaced.
*/
private boolean updateActions(@NonNull List<RuleAction> actions) {
List<RuleAction> before = mPrevActions;
List<RuleAction> after = actions;
if (before == null) {
return false;
}
if (!before.equals(after) || after.size() > mLayoutToolBar.getItemCount()) {
return false;
}
int actionIndex = 0;
for (int i = 0, max = mLayoutToolBar.getItemCount(); i < max; i++) {
ToolItem item = mLayoutToolBar.getItem(i);
int style = item.getStyle();
Object data = item.getData();
if (data != null) {
// One action can result in multiple toolbar items (e.g. a choice action
// can result in multiple radio buttons), so we've have to replace all of
// them with the corresponding new action
RuleAction prevAction = before.get(actionIndex);
while (prevAction != data) {
actionIndex++;
if (actionIndex == before.size()) {
return false;
}
prevAction = before.get(actionIndex);
if (prevAction == data) {
break;
} else if (!(prevAction instanceof RuleAction.Separator)) {
return false;
}
}
RuleAction newAction = after.get(actionIndex);
assert newAction.equals(prevAction); // Maybe I can do this lazily instead?
// Update action binding to the new action
item.setData(newAction);
// Sync button states: the checked state is not considered part of
// RuleAction equality
if ((style & SWT.CHECK) != 0) {
assert newAction instanceof Toggle;
Toggle toggle = (Toggle) newAction;
item.setSelection(toggle.isChecked());
} else if ((style & SWT.RADIO) != 0) {
assert newAction instanceof Choices;
Choices choices = (Choices) newAction;
String current = choices.getCurrent();
String id = (String) item.getData(ATTR_ID);
boolean selected = Strings.nullToEmpty(current).equals(id);
item.setSelection(selected);
}
} else {
// Must be a separator, or a label (which we insert for nested widgets)
assert (style & SWT.SEPARATOR) != 0 || !item.getText().isEmpty() : item;
}
}
return true;
}
/** Updates the layout contents based on the current selection */
void updateSelection() {
NodeProxy parent = null;
LayoutCanvas canvas = mEditor.getCanvasControl();
SelectionManager selectionManager = canvas.getSelectionManager();
List<SelectionItem> selections = selectionManager.getSelections();
if (selections.size() > 0) {
// TODO: better handle multi-selection -- maybe we should disable it or
// something.
// What if you select children with different parents? Of different types?
// etc.
NodeProxy node = selections.get(0).getNode();
if (node != null && node.getParent() != null) {
parent = (NodeProxy) node.getParent();
}
}
if (parent == null) {
// Show the background's properties
CanvasViewInfo root = canvas.getViewHierarchy().getRoot();
if (root == null) {
return;
}
parent = canvas.getNodeFactory().create(root);
selections = Collections.emptyList();
}
RulesEngine engine = mEditor.getRulesEngine();
List<NodeProxy> selectedNodes = new ArrayList<NodeProxy>();
for (SelectionItem item : selections) {
selectedNodes.add(item.getNode());
}
List<RuleAction> actions = new ArrayList<RuleAction>();
engine.callAddLayoutActions(actions, parent, selectedNodes);
// Place actions in the correct order (the actions may come from different
// rules and should be merged properly via sorting keys)
Collections.sort(actions);
// Add in actions for the child as well, if there is exactly one.
// These are not merged into the parent list of actions; they are appended
// at the end.
int index = -1;
String label = null;
if (selectedNodes.size() == 1) {
List<RuleAction> itemActions = new ArrayList<RuleAction>();
NodeProxy selectedNode = selectedNodes.get(0);
engine.callAddLayoutActions(itemActions, selectedNode, null);
if (itemActions.size() > 0) {
Collections.sort(itemActions);
if (!(itemActions.get(0) instanceof RuleAction.Separator)) {
actions.add(RuleAction.createSeparator(0));
}
label = selectedNode.getStringAttr(ANDROID_URI, ATTR_ID);
if (label != null) {
label = BaseViewRule.stripIdPrefix(label);
index = actions.size();
}
actions.addAll(itemActions);
}
}
if (!updateActions(actions)) {
updateToolbar(actions, index, label);
}
mPrevActions = actions;
}