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Nasal/prop_key_handler.nas: added new '#' command to listen to properties.

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Sets up listeners to show all changes to specified property or any of its child
properties.
This commit is contained in:
Julian Smith 2019-08-24 18:03:28 +01:00
parent 24553feb57
commit 96fd272a51
1 changed files with 59 additions and 0 deletions
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59
Nasal/prop_key_handler.nas
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@ -15,6 +15,7 @@
# <property>! -> add property to display list (reset list with /!)
# <property>: -> open property browser in this property's directory
# <string>? -> print all properties whose path or value contains this string
# <string># -> add listener for property and all child properties (cancel all listeners with /#)
#
#
# Keys:
@ -44,6 +45,8 @@ var listener = nil;
var input = nil; # what the user typed (doesn't contain unconfirmed autocompleted parts)
var text = nil; # what is shown in the popup
var state = nil;
var listeners = [];
var listeners_children = {};
var completion = [];
var completion_pos = -1;
@ -152,6 +155,62 @@ var handle_key = func(key, shift) {
stop(1);
return 1;
} elsif (key == `#`) {
# Add a listener.
#printf("received '#'. state.path=%s", view.str(state.path));
if (state.path == '/') {
foreach( var l; listeners) {
removelistener(l);
}
listeners = [];
listeners_children = {};
var text = sprintf("number of listeners=%s", size(listeners));
print(text);
screen.log.write(text, 1, 1, 1);
}
else {
var path = state.path;
node = props.globals.getNode(path);
if (node == nil) {
var text = "cannot find node for path=" ~ path;
print(text);
screen.log.write(text, 1, 1, 1);
}
else {
var listener = func(n) {
path = n.getPath();
value = n.getValue();
value_prev = listeners_children[path];
# We store old values in listeners_children[], so
# that we avoid printing lots of diagnostics for
# writes that don't change the value.
#
# setlistener() only stores the main node's value,
# so we have to do this by hand for child nodes.
#
# [In any case, the setlistener() API isn't able to
# support both listening to child nodes and avoid
# reporting non-changing write accesses.]
#
listeners_children[path] = value;
if (value != value_prev) {
if (value == nil) value = "<nil>";
var text = path ~ "=" ~ value;
print(text);
screen.log.write(text, 1, 1, 1);
}
}
var l = setlistener(node, listener, 0, 2);
append(listeners, l);
var text = sprintf("number of listeners=%s", size(listeners));
print(text);
screen.log.write(text, 1, 1, 1);
}
}
stop(1);
return 1;
} elsif (key == `:` and state.node != nil and state.value == nil) {
var n = state.node.getAttribute("children") ? state.node : state.parent;
gui.property_browser(n);