WItemDelegate customization

Added by Hans-Michael Muller about 11 years ago

Hello,

I am trying to implement a specialized WItemDelegate. In particular, I'd like to replace the WLineEdit that comes with the default with a WTextArea for each item. So I wrote

my own delegate (see attached files), and simply added the setItemDelegate method:

model_ = new Wt::WStandardItemModel(0, 0);

table_ = new Wt::WTableView();

myowndelegate_ = new PgTableEditorItemDelegate(); // added

table*->setItemDelegate(myowndelegate*); // added

SetTable(); // some irrelevant formatting

SizeColumns(); //more irrelevant formatting

table*->setModel(model*);

containers*.table->addWidget(table*);

When implementing, I can see the text area in each cell, however, I cannot edit them, even though I have set all items Wt::ItemIsEditable. In fact, the new setEditState and editState are never called. Before adding the new class and the two line above, I could edit every cell.

Thanks for your help,

Michael.

Download all files

PgTableEditorItemDelegate.cpp (2.35 KB) PgTableEditorItemDelegate.cpp
PgTableEditorItemDelegate.h (781 Bytes) PgTableEditorItemDelegate.h

Replies (2)

RE: WItemDelegate customization - Added by Hans-Michael Muller about 11 years ago

I think the problem is that the text area doesn't stay focussed after I clicked it once. If I keep my mouse button down, it gets the focus and I can edit the textarea. Strange.

RE: WItemDelegate customization - Added by Koen Deforche about 11 years ago

Hey Hans,

For the focusing issue I do not have an explain ready.

But I can show you an item delegate implementation that does about the same (in Java), but it's been designed for a table which always has all editors open (and thus there is no processing of events that close the editor). Perhaps it provides a hint of what to do to make it work.

        tableView.setItemDelegate(new WItemDelegate() {
            @Override
            protected WWidget createEditor(final WModelIndex index,
                    EnumSet<ViewItemRenderFlag> flags) {
                final WContainerWidget result = new WContainerWidget();
                result.setSelectable(true);
                final WTextArea textArea = new WTextArea();
                textArea.setText(StringUtils.asString(index.getData(ItemDataRole.EditRole)).toString());

                textArea.changed().addListener(this, new Signal.Listener() {
                    @Override
                    public void trigger() {
                        changed.trigger();
                    }
                });

                result.setLayout(new WHBoxLayout());
                result.getLayout().setContentsMargins(1, 1, 1, 1);
                result.getLayout().addWidget(textArea);

                return result;
            }

            @Override
            public Object getEditState(WWidget editor) {
                WContainerWidget w = (WContainerWidget) (editor);
                WTextArea textArea = (WTextArea) w.getWidget(0);
                return textArea.getText();
            }

            @Override
            public void setEditState(WWidget editor, Object value) {
                WContainerWidget w = (WContainerWidget) (editor);
                WTextArea textArea = (WTextArea) w.getWidget(0);
                textArea.setText((String) value);
            }

            @Override
            public WWidget update(WWidget widget, WModelIndex index,
                    EnumSet<ViewItemRenderFlag> flags) {
                WWidget w = super.update(widget, index, flags);
                WInteractWidget wi = (WInteractWidget) w;
                wi.mouseWentDown().preventPropagation(false);
                wi.clicked().preventPropagation(false);
                return w;
            }

Regards,

koen

(1-2/2)

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