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#include <lib/gui/elistbox.h>
#include <lib/gui/elistboxcontent.h>
#include <lib/actions/action.h>
eListbox::eListbox(eWidget *parent): eWidget(parent)
{
setContent(new eListboxStringContent());
ePtr<eActionMap> ptr;
eActionMap::getInstance(ptr);
ptr->bindAction("ListboxActions", 0, 0, this);
}
eListbox::~eListbox()
{
ePtr<eActionMap> ptr;
eActionMap::getInstance(ptr);
ptr->unbindAction(this, 0);
}
void eListbox::setContent(iListboxContent *content)
{
m_content = content;
if (content)
m_content->setListbox(this);
entryReset();
}
void eListbox::moveSelection(int dir)
{
/* refuse to do anything without a valid list. */
if (!m_content)
return;
/* we need the old top/sel to see what we have to redraw */
int oldtop = m_top;
int oldsel = m_selected;
/* first, move cursor */
switch (dir)
{
case moveUp:
m_content->cursorMove(-1);
break;
case moveDown:
m_content->cursorMove(1);
/* ok - we could have reached the end. we just go one back then. */
if (!m_content->cursorValid())
m_content->cursorMove(-1);
break;
case moveTop:
m_content->cursorHome();
m_top = 0; /* align with top, speeds up process */
break;
case moveEnd:
/* move to last existing one ("end" is already invalid) */
m_content->cursorEnd(); m_content->cursorMove(-1);
m_top = m_content->cursorGet() - m_items_per_page + 1;
if (m_top < 0)
m_top = 0;
break;
case justCheck:
break;
}
/* note that we could be on an invalid cursor position, but we don't
care. this only happens on empty lists, and should have almost no
side effects. */
/* now, look wether the current selection is out of screen */
m_selected = m_content->cursorGet();
if (m_selected < m_top)
{
m_top -= m_items_per_page;
if (m_top < 0)
m_top = 0;
} else if (m_selected >= m_top + m_items_per_page)
{
/* m_top should be always valid here as it's selected */
m_top += m_items_per_page;
}
if (m_top != oldtop)
invalidate();
else if (m_selected != oldsel)
{
/* redraw the old and newly selected */
gRegion inv = eRect(0, m_itemheight * (m_selected-m_top), size().width(), m_itemheight);
inv |= eRect(0, m_itemheight * (oldsel-m_top), size().width(), m_itemheight);
invalidate(inv);
}
}
int eListbox::event(int event, void *data, void *data2)
{
switch (event)
{
case evtPaint:
{
ePtr<eWindowStyle> style;
if (!m_content)
return eWidget::event(event, data, data2);
assert(m_content);
recalcSize(); // move to event
getStyle(style);
if (!m_content)
return 0;
gPainter &painter = *(gPainter*)data2;
m_content->cursorSave();
m_content->cursorMove(m_top - m_selected);
for (int y = 0, i = 0; i < m_items_per_page; y += m_itemheight, ++i)
{
m_content->paint(painter, *style, ePoint(0, y), m_selected == m_content->cursorGet());
m_content->cursorMove(+1);
}
m_content->cursorRestore();
return 0;
}
case evtAction:
moveSelection((int)data2);
return 1;
default:
return eWidget::event(event, data, data2);
}
}
void eListbox::recalcSize()
{
m_itemheight = 20;
m_content->setSize(eSize(size().width(), m_itemheight));
m_items_per_page = size().height() / m_itemheight;
}
void eListbox::entryAdded(int index)
{
/* manage our local pointers. when the entry was added before the current position, we have to advance. */
/* we need to check <= - when the new entry has the (old) index of the cursor, the cursor was just moved down. */
if (index <= m_selected)
++m_selected;
if (index <= m_top)
++m_top;
/* we have to check wether our current cursor is gone out of the screen. */
/* moveSelection will check for this case */
moveSelection(justCheck);
/* now, check if the new index is visible. */
if ((m_top <= index) && (index < (m_top + m_items_per_page)))
{
/* todo, calc exact invalidation... */
invalidate();
}
}
void eListbox::entryRemoved(int index)
{
if (index == m_selected)
m_selected = m_content->cursorGet();
moveSelection(justCheck);
if ((m_top <= index) && (index < (m_top + m_items_per_page)))
{
/* todo, calc exact invalidation... */
invalidate();
}
}
void eListbox::entryChanged(int index)
{
if ((m_top <= index) && (index < (m_top + m_items_per_page)))
{
gRegion inv = eRect(0, m_itemheight * (index-m_top), size().width(), m_itemheight);
invalidate(inv);
}
}
void eListbox::entryReset()
{
if (m_content)
m_content->cursorHome();
m_top = 0;
m_selected = 0;
invalidate();
}
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