#include <lib/gui/elistbox.h>
+#include <lib/gui/elistboxcontent.h>
+#include <lib/actions/action.h>
-/*
- The basic idea is to have an interface which gives all relevant list
- processing functions, and can be used by the listbox to browse trough
- the list.
-
- The listbox directly uses the implemented cursor. It tries hard to avoid
- iterating trough the (possibly very large) list, so it should be O(1),
- i.e. the performance should not be influenced by the size of the list.
-
- The list interface knows how to draw the current entry to a specified
- offset. Different interfaces can be used to adapt different lists,
- pre-filter lists on the fly etc.
-
- cursorSave/Restore is used to avoid re-iterating the list on redraw.
- The current selection is always selected as cursor position, the
- cursor is then positioned to the start, and then iterated. This gives
- at most 2x m_items_per_page cursor movements per redraw, indepenent
- of the size of the list.
-
- Although cursorSet is provided, it should be only used when there is no
- other way, as it involves iterating trough the list.
- */
-
-class eListboxTestContent: public virtual iListboxContent
-{
- DECLARE_REF;
-public:
- void cursorHome();
- void cursorEnd();
- int cursorMove(int count=1);
- int cursorValid();
- int cursorSet(int n);
- int cursorGet();
-
- void cursorSave();
- void cursorRestore();
- int size();
-
- RESULT connectItemChanged(const Slot0<void> &itemChanged, ePtr<eConnection> &connection);
-
- // void setOutputDevice ? (for allocating colors, ...) .. requires some work, though
- void setSize(const eSize &size);
-
- /* the following functions always refer to the selected item */
- void paint(gPainter &painter, eWindowStyle &style, const ePoint &offset, int selected);
-private:
- int m_cursor, m_saved_cursor;
- eSize m_size;
-};
-
-DEFINE_REF(eListboxTestContent);
-
-void eListboxTestContent::cursorHome()
-{
- m_cursor = 0;
-}
-
-void eListboxTestContent::cursorEnd()
-{
- m_cursor = size();
-}
-
-int eListboxTestContent::cursorMove(int count)
-{
- m_cursor += count;
-
- if (m_cursor < 0)
- cursorHome();
- else if (m_cursor > size())
- cursorEnd();
- return 0;
-}
-
-int eListboxTestContent::cursorValid()
-{
- return m_cursor < size();
-}
-
-int eListboxTestContent::cursorSet(int n)
-{
- m_cursor = n;
-
- if (m_cursor < 0)
- cursorHome();
- else if (m_cursor > size())
- cursorEnd();
- return 0;
-}
-
-int eListboxTestContent::cursorGet()
-{
- return m_cursor;
-}
-
-void eListboxTestContent::cursorSave()
-{
- m_saved_cursor = m_cursor;
-}
-
-void eListboxTestContent::cursorRestore()
+eListbox::eListbox(eWidget *parent): eWidget(parent)
{
- m_cursor = m_saved_cursor;
-}
+ setContent(new eListboxStringContent());
-int eListboxTestContent::size()
-{
- return 10;
-}
+ ePtr<eActionMap> ptr;
+ eActionMap::getInstance(ptr);
-RESULT eListboxTestContent::connectItemChanged(const Slot0<void> &itemChanged, ePtr<eConnection> &connection)
-{
- return 0;
-}
-
-void eListboxTestContent::setSize(const eSize &size)
-{
- m_size = size;
-}
-
-void eListboxTestContent::paint(gPainter &painter, eWindowStyle &style, const ePoint &offset, int selected)
-{
- ePtr<gFont> fnt = new gFont("Arial", 14);
- painter.clip(eRect(offset, m_size));
- style.setStyle(painter, selected ? eWindowStyle::styleListboxSelected : eWindowStyle::styleListboxNormal);
- painter.clear();
-
- if (cursorValid())
- {
- painter.setFont(fnt);
- char string[10];
- sprintf(string, "%d.)", m_cursor);
-
- ePoint text_offset = offset + (selected ? ePoint(2, 2) : ePoint(1, 1));
-
- painter.renderText(eRect(text_offset, m_size), string);
-
- if (selected)
- style.drawFrame(painter, eRect(offset, m_size), eWindowStyle::frameListboxEntry);
- }
+ m_itemheight = 25;
- painter.clippop();
+ ptr->bindAction("ListboxActions", 0, 0, this);
}
-eListbox::eListbox(eWidget *parent): eWidget(parent)
+eListbox::~eListbox()
{
- setContent(new eListboxTestContent());
- m_content->cursorHome();
- m_top = 0;
- m_selected = 0;
+ 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;
if (!m_content->cursorValid())
m_content->cursorMove(-1);
break;
+ case pageUp:
+ if (m_content->cursorGet() >= m_items_per_page)
+ {
+ m_content->cursorMove(-m_items_per_page);
+ m_top -= m_items_per_page;
+ if (m_top < 0)
+ m_top = 0;
+ } else
+ {
+ m_top = 0;
+ m_content->cursorHome();
+ }
+ break;
case moveTop:
m_content->cursorHome();
m_top = 0; /* align with top, speeds up process */
break;
+
+ case pageDown:
+ m_content->cursorMove(m_items_per_page);
+ if (m_content->cursorValid())
+ break;
+ /* fall through */
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;
+ /* current selection invisible? */
+ if (m_top + m_items_per_page <= m_content->cursorGet())
+ {
+ m_top = m_content->cursorGet() - m_items_per_page + 1;
+ if (m_top < 0)
+ m_top = 0;
+ }
+ break;
+ case justCheck:
break;
}
/* 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;
/* m_top should be always valid here as it's selected */
m_top += m_items_per_page;
}
-
+
if (m_top != oldtop)
invalidate();
- else
+ 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);
{
ePtr<eWindowStyle> style;
+ if (!m_content)
+ return eWidget::event(event, data, data2);
assert(m_content);
- recalcSize(); // move to event
getStyle(style);
return 0;
}
+ case evtChangedSize:
+ recalcSize();
+ return eWidget::event(event, data, data2);
+
+ case evtAction:
+ if (isVisible())
+ {
+ moveSelection((int)data2);
+ return 1;
+ }
+ return 0;
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::setItemHeight(int h)
+{
+ if (h)
+ m_itemheight = h;
+ else
+ m_itemheight = 20;
+ recalcSize();
+}
+
+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();
+}
git.cweiske.de / enigma2.git / blobdiff