Paranoia2/game_shared/vgui_listbox.cpp

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//========= Copyright © 1996-2002, Valve LLC, All rights reserved. ============
2020-08-31 18:50:41 +02:00
//
// Purpose:
//
// $NoKeywords: $
//=============================================================================
#include "vgui_listbox.h"
using namespace vgui;
CListBox::CListBox() : Panel(0, 0, 0, 0),
m_ItemsPanel(0,0,0,0),
m_ScrollBar(0, 0, 0, 0, true),
m_Slider(0, 0, 10, 40, true)
{
m_Signal.m_pListBox = this;
m_ItemsPanel.setParent(this);
m_ItemsPanel.setBgColor(0,0,0,255);
m_Slider.setRangeWindow(50);
m_Slider.setRangeWindowEnabled(true);
m_ScrollBar.setParent(this);
m_ScrollBar.addIntChangeSignal(&m_Signal);
m_ScrollBar.setSlider(&m_Slider);
m_ScrollBar.setButtonPressedScrollValue(1);
m_Items.m_pNext = m_Items.m_pPrev = &m_Items;
m_ItemOffset = 0;
m_iScrollMax = -1;
}
CListBox::~CListBox()
{
Term();
}
void CListBox::Init()
{
Term();
}
void CListBox::Term()
{
m_ItemOffset = 0;
// Free the LBItems.
LBItem *pNext;
for(LBItem *pItem=m_Items.m_pNext; pItem != &m_Items; pItem=pNext)
{
pItem->m_pPanel->setParent(NULL); // detach the panel from us
pNext = pItem->m_pNext;
delete pItem;
}
m_Items.m_pPrev = m_Items.m_pNext = &m_Items;
}
void CListBox::AddItem(Panel* panel)
{
// Add the item.
LBItem *pItem = new LBItem;
if(!pItem)
return;
pItem->m_pPanel = panel;
pItem->m_pPanel->setParent(&m_ItemsPanel);
pItem->m_pPrev = m_Items.m_pPrev;
pItem->m_pNext = &m_Items;
pItem->m_pNext->m_pPrev = pItem->m_pPrev->m_pNext = pItem;
m_ScrollBar.setRange(0, GetScrollMax());
m_Slider.setRangeWindow(50);
m_Slider.setRangeWindowEnabled(true);
InternalLayout();
}
int CListBox::GetNumItems()
{
int count=0;
for(LBItem *pItem=m_Items.m_pNext; pItem != &m_Items; pItem=pItem->m_pNext)
++count;
return count;
}
int CListBox::GetItemWidth()
{
int wide, tall;
m_ItemsPanel.getSize(wide, tall);
return wide;
}
int CListBox::GetScrollPos()
{
return m_ItemOffset;
}
void CListBox::SetScrollPos(int pos)
{
int maxItems = GetScrollMax();
if(maxItems < 0)
return;
m_ItemOffset = (pos < 0) ? 0 : ((pos > maxItems) ? maxItems : pos);
InternalLayout();
}
void CListBox::setPos(int x, int y)
{
Panel::setPos(x, y);
InternalLayout();
}
void CListBox::setSize(int wide,int tall)
{
Panel::setSize(wide,tall);
InternalLayout();
}
void CListBox::setPixelScroll(int value)
{
m_ItemOffset = m_ScrollBar.getValue();
InternalLayout();
}
void CListBox::InternalLayout()
{
int x, y, wide, tall;
getBounds(x, y, wide, tall);
// Reposition the main panel and the scrollbar.
m_ItemsPanel.setBounds(0, 0, wide-15, tall);
m_ScrollBar.setBounds(wide-15, 0, 15, tall);
bool bNeedScrollbar = false;
// Reposition the items.
int curItem = 0;
int curY = 0;
int maxItem = GetScrollMax();
for(LBItem *pItem=m_Items.m_pNext; pItem != &m_Items; pItem=pItem->m_pNext)
{
if(curItem < m_ItemOffset)
{
pItem->m_pPanel->setVisible(false);
bNeedScrollbar = true;
}
else if (curItem >= maxItem)
{
// item is past the end of the items we care about
pItem->m_pPanel->setVisible(false);
}
else
{
pItem->m_pPanel->setVisible(true);
int itemWidth, itemHeight;
pItem->m_pPanel->getSize(itemWidth, itemHeight);
// Don't change the item's height but change its width to fit the listbox.
pItem->m_pPanel->setBounds(0, curY, wide, itemHeight);
curY += itemHeight;
if (curY > tall)
{
bNeedScrollbar = true;
}
}
++curItem;
}
m_ScrollBar.setVisible(bNeedScrollbar);
repaint();
}
void CListBox::paintBackground()
{
}
void CListBox::SetScrollRange(int maxScroll)
{
m_iScrollMax = maxScroll;
m_ScrollBar.setRange(0, maxScroll);
InternalLayout();
}
int CListBox::GetScrollMax()
{
if (m_iScrollMax < 0)
{
return GetNumItems() - 1;
}
return m_iScrollMax;
}