Difference between revisions of "VGUI SectionedListPanel"

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A SectionedListPanel is a vgui2 element defined in the vgui_controls library, in the file SectionedListPanel.cpp. SectionedListPanels are available in all source games. SectionedListPanels, as the name suggests, are useful for listing sectioned groups of information. Furthermore, the list items are sortable. The standard scoreboard was created using a CClientScoreBoardDialog : SectionedListPanel, and thus represents a good example of the SectionedListPanel's capabilities.  
 
A SectionedListPanel is a vgui2 element defined in the vgui_controls library, in the file SectionedListPanel.cpp. SectionedListPanels are available in all source games. SectionedListPanels, as the name suggests, are useful for listing sectioned groups of information. Furthermore, the list items are sortable. The standard scoreboard was created using a CClientScoreBoardDialog : SectionedListPanel, and thus represents a good example of the SectionedListPanel's capabilities.  
  
The member m_Items is a CutlLinkedList structure that contains ''unsorted'' items, SectionedListPanel::ResortList() traverses through m_Items and sorts m_Items provided you define a sorting function passed via AddSection(), and subsequently stored in m_pFuncSort. Look at CClientScoreBoardDialog::StaticPlayerSortFunc for an example sorting function. The resulting, sorted list is then stored in m_ItemSorted.  
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The member '''m_Items''' is a CutlLinkedList structure that contains '''unsorted''' items, SectionedListPanel::ResortList() traverses through m_Items and sorts m_Items provided you define a sorting function '''m_pFuncSort''' passed via AddSection(). Look at CClientScoreBoardDialog::StaticPlayerSortFunc for an example sorting function. The resulting, sorted list is then stored in m_ItemSorted.  
  
 
[[Image:SectionedListPanel.jpg|thumb|This screenshot represents valve's default scoreboard which was built using a SectionedListPanel.]]
 
[[Image:SectionedListPanel.jpg|thumb|This screenshot represents valve's default scoreboard which was built using a SectionedListPanel.]]

Revision as of 15:08, 13 April 2011

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A SectionedListPanel is a vgui2 element defined in the vgui_controls library, in the file SectionedListPanel.cpp. SectionedListPanels are available in all source games. SectionedListPanels, as the name suggests, are useful for listing sectioned groups of information. Furthermore, the list items are sortable. The standard scoreboard was created using a CClientScoreBoardDialog : SectionedListPanel, and thus represents a good example of the SectionedListPanel's capabilities.

The member m_Items is a CutlLinkedList structure that contains unsorted items, SectionedListPanel::ResortList() traverses through m_Items and sorts m_Items provided you define a sorting function m_pFuncSort passed via AddSection(). Look at CClientScoreBoardDialog::StaticPlayerSortFunc for an example sorting function. The resulting, sorted list is then stored in m_ItemSorted.

This screenshot represents valve's default scoreboard which was built using a SectionedListPanel.

Example Usage

Before creating anything, we first need to include the SectionedListPanel header file and use the vgui namespace.

#include <vgui_controls/SectionedListPanel.h>
using namespace vgui;

SectionedListPanels can be created via the c++ keyword new with a simple call to SectionedListPanel.

SectionedListPanel* myPanel = new SectionedListPanel(this, "myPanel");


Example Sorting Function

This is taken from CClientScoreBoardDialog, note that the sort function returns true if itemID1 > itemID2. Hence the term static sort.

bool CClientScoreBoardDialog::StaticPlayerSortFunc(vgui::SectionedListPanel *list, int itemID1, int itemID2)
{
	KeyValues *it1 = list->GetItemData(itemID1);
	KeyValues *it2 = list->GetItemData(itemID2);
	Assert(it1 && it2);

	// first compare frags
	int v1 = it1->GetInt("frags");
	int v2 = it2->GetInt("frags");
	if (v1 > v2)
		return true;
	else if (v1 < v2)
		return false;

	// next compare deaths
	v1 = it1->GetInt("deaths");
	v2 = it2->GetInt("deaths");
	if (v1 > v2)
		return false;
	else if (v1 < v2)
		return true;

	// the same, so compare itemID's (as a sentinel value to get deterministic sorts)
	return itemID1 < itemID2;
}

Additional Information

Additional information and examples can be found by simply looking at the scoreboard code, found in ClientScoreBoardDialog.cpp in the game_controls folder.