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Hello, and first thanks Emmanuele for your quick help on my previous
question (Re: allocation warnings when resizing Text) :)
Now I am implementing a table LayoutManager for Box, and have problems
with the LayoutMeta. The problem is I can only get Box.pack() to work
correctly (i.e. set LayoutMeta properties) when I call
LayoutManager.get_child_meta right before. Does anybody see what I am
missing?
This is the code in vala:
===================================================================
class TableChild : LayoutMeta {
private uint _colspan;
private uint _rowspan;
construct {
}
public TableChild(LayoutManager man, Container con, Actor act) {
Object(manager: man, container: con, actor: act);
}
public uint colspan {
get { return _colspan; }
set { _colspan = value; manager.layout_changed();}
}
public uint rowspan {
get { return _rowspan; }
set { _rowspan = value; manager.layout_changed();}
}
}
class TableLayout : LayoutManager {
public uint numcolums { get; construct set; }
public uint spacing { get; construct set; }
construct {
this.notify.connect(on_property_change);
}
public TableLayout (uint colums, uint _spacing=5){
Object (numcolums: colums, spacing: _spacing);
}
public void on_property_change (ParamSpec pspec){
this.layout_changed();
}
public override Type get_child_meta_type (){
Type t = Type.from_name ("TableChild");
return t;
}
public override void get_preferred_height (Container container,
float for_width, float min_height_p, float nat_height_p){
foreach(Actor child in container.get_children()) {
var child_meta = get_child_meta(container, child) as TableChild;
//the next lines only work correctly when I call
//'get_layout_meta' on the layout manager right before
//calling 'box.pack'
if (child_meta!=null)
stdout.printf("child %s meta: %u, %u\n",
child.name, child_meta.colspan, child_meta.rowspan);
else
stdout.printf("child %s meta null\n", child.name);
}
}
=============================================================
test code:
public Box construct_keyboard() {
TableLayout table = new TableLayout(12);
Box keyboard = new Box(table);
for (unichar letter='A'; letter <= 'Z'; letter++) {
Text k = new Text.full("Arial", letter.to_string(),
Color.from_string ("white"));
//strange: it only creates the layout meta when
//I put the following line before calling 'pack'
var child_meta = table.get_child_meta(keyboard, k)
as TableChild;
keyboard.pack(k,"colspan", 1);
}
return keyboard;
}
=================================================================
Any help is appreciated. Thanks again,
Dio.-
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