如何实现在列表中每次只能选一项

yaling

请问大家，如何用PCL中实现下列表选项中，每次点击鼠标只能选择一项，而不能象图所示，可以选择多项。敢问是不是在ui_wid_get( listbox_id1, "NSELECTED",group_number ) 和ui_wid_get( listbox_id1, "VALUE",group_items )中如何修改。

kalaok

帮助里面写的很清楚了
ui_listbox_create( parent, callback, x, y, width, num_rows, label, selection_type, sort )
STRING  selection_type  “BROWSE”, “EXTEND”, “MULTIPLE”, or “SINGLE”. See selection_type Modes.  

Four different selection_type modes exist for the listbox, as follows:

Single  Allows only one pick at a time. Here, pressing down on an item will automatically pick it. Any scrolling done afterwards or a releasing of the mouse button on another item will be inconsequential. Arrow keys highlight subsequent items which also selects one at a time.  

Browse  Allows only one selection to be made at a time. Pressing down on an item only initiates picking, then you may scroll up and down through the other choices without making a selection. As the cursor moves over the items, the item corresponding to the cursor location will become highlighted. Releasing the mouse button on the highlighted item makes the selection. Keyboard selection works the same for browse mode as for single mode.  

Multiple  Allows picking of more than one item by clicking each one separately. It will also toggle off previously highlighted items. The arrow keys highlight the items while the space bar selects and deselects them.  

Extend  Also permits multiple picking of items. Pressing down on the left mouse button with the cursor on the first (base) item desired will initiate picking. Next, dragging through any adjacent items will highlight them also. These highlights are temporary and can be changed by dragging elsewhere in the listbox. Releasing the mouse button on another item will pick all items between the base and last item inclusively.  

也就是说selection_type应该选SINGLE

kalaok

另外修改widget的属性是用ui_wid_set,获取信息才是ui_wid_get
你也可以通过ui_wid_set(wid,"SELECTIONTYPE",“SINGLE")来实现每次只选择一项

yaling

非常感谢您，按你的方法，我得到了自己所要的效果，真心的谢谢。