WItemDelegate and editable tables
Added by Mark Petryk over 4 years ago
Perhaps I'm misusing WItemDelegate but I am trying to replace an 'id' column value with a 'text' column value for that id.
The 'id' is provided by the underlying table. I want to take that 'id' value, look up the item it belongs to and display some other text value from that record. But, I have editing enabled on the table, and if I open an editor and then close it, on any other column, the table-view updates the 'id' column with the original ID value and not the replaced text value. However, also, the WItemDelegate::update function never gets called when I update some other column.
(see attached image)
My code for the delegate is here;
88 virtual std::unique_ptr<Wt::WWidget> update( Wt::WWidget * widget, const Wt::WModelIndex & index, Wt::WFlags< Wt::ViewItemRenderFlag > flags )
89 {
90 auto w =
91 Wt::WItemDelegate::update( widget, index, flags );
92
93 Wt::WText * text = static_cast<Wt::WText *>(w.get());
94
95 if( text )
96 {
97
98 auto value = Wt::asNumber( index.model()-> data( index.row(), index.column() ) );
99
100 std::string newvalue;
101
102 if( value > 0 )
103 {
104 auto item = Rtm::Dbo::Bol::load( value );
105 newvalue = item-> bolNumber();
106 }
107
108 text-> setText( newvalue );
109
110 } // endif( text )
111
112 return w;
113
114 } // endupdate(...)
I would appreciate any comments on this.
Replies (3)
RE: WItemDelegate and editable tables - Added by Mark Petryk over 4 years ago
Interestingly... when browsing through the Wt source, I came across a file that does not appear to be in the documentation;
"wt/Dbo/QueryColumn"
Further, this object "QueryColumn" appears in QueryModel tagged as "later", so as I read through the source, it looks like perhaps this is the beginning of hooks for a combo-box solution to the table views?
That would be cool!
RE: WItemDelegate and editable tables - Added by Mark Petryk over 4 years ago
When I said
"However, also, the WItemDelegate::update function never gets called when I update some other column."
That's not true. update() is being called, when I click on some other column.
RE: WItemDelegate and editable tables - Added by Mark Petryk over 4 years ago
Ok, Sorry for the noise! I have sorted out my issues.
This is my new update function, and it does appear to work correctly;
108 virtual std::unique_ptr<Wt::WWidget> update
109 (
110 Wt::WWidget * widget,
111 const Wt::WModelIndex & index,
112 Wt::WFlags< Wt::ViewItemRenderFlag > flags
113 )
114 {
115 std::unique_ptr< Wt::WWidget > retVal;
116
117 if( !widget )
118 {
119 retVal = Wt::WItemDelegate::update( widget, index, flags );
120
121 widget = retVal.get();
122 }
123
124 Wt::WText * text = dynamic_cast<Wt::WText *>( widget );
125
126 if( text )
127 {
128 auto value = Wt::asNumber( index.model()-> data( index.row(), index.column() ) );
129
130 std::string newvalue;
131
132 if( value > 0 )
133 {
134 auto item = Rtm::Dbo::Bol::load( value );
135 newvalue = item-> bolNumber();
136 }
137
138 text-> setText( newvalue );
139
140 } // endif( text )
141
142 return retVal;
143
144 } // endupdate(...)