treecombobox.cpp

00001 /*
00002  *  This file is part of the KDE libraries
00003  *  Copyright (c) 2001 Michael Goffioul <kdeprint@swing.be>
00004  *
00005  *  This library is free software; you can redistribute it and/or
00006  *  modify it under the terms of the GNU Library General Public
00007  *  License version 2 as published by the Free Software Foundation.
00008  *
00009  *  This library is distributed in the hope that it will be useful,
00010  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  *  Library General Public License for more details.
00013  *
00014  *  You should have received a copy of the GNU Library General Public License
00015  *  along with this library; see the file COPYING.LIB.  If not, write to
00016  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00017  *  Boston, MA 02110-1301, USA.
00018  **/
00019 
00020 #include "treecombobox.h"
00021 
00022 #include <qpainter.h>
00023 
00024 TreeListBoxItem::TreeListBoxItem(QListBox *lb, const QPixmap& pix, const QString& txt, bool oneBlock)
00025     : QListBoxPixmap(pix, txt)
00026 {
00027     if (oneBlock)
00028         m_path = QStringList(txt);
00029     else
00030         m_path = QStringList::split('/', text(), false);
00031     m_depth = m_path.count()-1;
00032     m_child = m_next = m_parent = 0;
00033 
00034     // insert into QListBox
00035     if (m_depth == 0)
00036     {
00037         TreeListBoxItem *item = static_cast<TreeListBoxItem*>(lb->item(0));
00038         while (item && item->m_next)
00039             item = item->m_next;
00040         lb->insertItem(this);
00041         if (item)
00042             item->m_next = this;
00043     }
00044     else
00045     {
00046         QString parentStr = txt.left(txt.length()-m_path[m_depth].length()-1);
00047         TreeListBoxItem *parentItem = static_cast<TreeListBoxItem*>(lb->findItem(parentStr, Qt::ExactMatch));
00048         if (!parentItem)
00049         {
00050             // parent not found, add parent first into QListBox
00051             parentItem = new TreeListBoxItem(lb, QPixmap(), parentStr);
00052         }
00053         // search last "child" of the parent item, to put the new one
00054         // at the end
00055         TreeListBoxItem *childItem = static_cast<TreeListBoxItem*>(parentItem), *prevItem = 0;
00056         while (childItem->next())
00057         {
00058             TreeListBoxItem *nextItem = static_cast<TreeListBoxItem*>(childItem->next());
00059             if (nextItem->m_depth >= m_depth)
00060             {
00061                 childItem = nextItem;
00062                 if (childItem->m_depth == m_depth)
00063                     prevItem = childItem;
00064             }
00065             else
00066                 break;
00067         }
00068         // eventually insert item
00069         lb->insertItem(this, childItem);
00070         m_parent = parentItem;
00071         if (prevItem)
00072             prevItem->m_next = this;
00073         else
00074             parentItem->m_child = this;
00075     }
00076 }
00077 
00078 int TreeListBoxItem::width(const QListBox *lb) const
00079 {
00080     int w = m_depth * stepSize() + 2;
00081     if (pixmap())
00082         w += (pixmap()->width() + 2);
00083     if (!m_path[m_depth].isEmpty())
00084         w += (lb->fontMetrics().width(m_path[m_depth]) + 2);
00085     return QMAX(w, QListBoxPixmap::width(lb));
00086 }
00087 
00088 void TreeListBoxItem::paint(QPainter *p)
00089 {
00090     if(!static_cast<TreeListBox*>(listBox())->m_painting)
00091     {
00092         QListBoxPixmap::paint(p);
00093         return;
00094     }
00095 
00096     const QPixmap   *pix = pixmap();
00097     QRect   r = p->viewport();
00098     int h = height(listBox());
00099     int xo = (m_depth * stepSize() + 2);
00100     int yo = (pix ? (h-pix->height())/2 : 0);
00101 
00102     if (m_depth > 0)
00103     {
00104         QPen    oldPen = p->pen();
00105         p->setPen(listBox()->colorGroup().mid());
00106 
00107         TreeListBoxItem *item = this;
00108         int s = xo-stepSize()/2;
00109         p->drawLine(s, r.top(), s, h/2);
00110         p->drawLine(s, h/2, s+stepSize()/2-2, h/2);
00111         while (item->m_parent)
00112         {
00113             if (item->m_next)
00114                 p->drawLine(s, r.top(), s, h);
00115             item = item->m_parent;
00116             s -= stepSize();
00117         }
00118 
00119         p->setPen(oldPen);
00120     }
00121     if (pix)
00122     {
00123         p->drawPixmap(xo, yo, *pix);
00124         xo += (pix->width() + 2);
00125     }
00126     p->drawText(xo, 0, r.width()-xo, height(listBox()), Qt::AlignLeft, m_path[m_depth]);
00127 }
00128 
00129 //-----------------------------------------------------------------------------------------
00130 
00131 TreeListBox::TreeListBox(QWidget *parent, const char *name)
00132     : QListBox(parent, name)
00133 {
00134     m_painting = false;
00135 }
00136 
00137 void TreeListBox::paintCell(QPainter *p, int row, int col)
00138 {
00139     m_painting = true;
00140     QListBox::paintCell(p, row, col);
00141     m_painting = false;
00142 }
00143 
00144 //-----------------------------------------------------------------------------------------
00145 
00146 TreeComboBox::TreeComboBox(QWidget *parent, const char *name)
00147     : QComboBox(parent, name)
00148 {
00149     m_listbox = new TreeListBox(this);
00150     setListBox(m_listbox);
00151 }
00152 
00153 void TreeComboBox::insertItem(const QPixmap& pix, const QString& txt, bool oneBlock)
00154 {
00155     new TreeListBoxItem(m_listbox, pix, txt, oneBlock);
00156 }
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