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# kbuttonbox.cpp

    00001 /* This file is part of the KDE libraries
    00002     Copyright (C) 1997 Mario Weilguni (mweilguni@sime.com)
    00003
    00004     This library is free software; you can redistribute it and/or
    00005     modify it under the terms of the GNU Library General Public
    00006     License as published by the Free Software Foundation; either
    00007     version 2 of the License, or (at your option) any later version.
    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., 59 Temple Place - Suite 330,
    00017     Boston, MA 02111-1307, USA.
    00018 */
    00019
    00020 /*
    00021  * KButtonBox class
    00022  *
    00023  * A container widget for buttons. Uses Qt layout control to place the
    00024  * buttons, can handle both vertical and horizontal button placement.
    00025 *
    00026  * HISTORY
    00027  *
    00028  * 03/08/2000 Mario Weilguni <mweilguni@kde.org>
    00029  * Removed all those long outdated Motif stuff
    00030  * Improved and clarified some if conditions (easier to understand)
    00031  *
    00032  * 11/13/98 Reginald Stadlbauer <reggie@kde.org>
    00033  * Now in Qt 1.4x motif default buttons have no extra width/height anymore.
    00034  * So the KButtonBox doesn't add this width/height to default buttons anymore
    00035  * which makes the buttons look better.
    00036  *
    00037  * 01/17/98  Mario Weilguni <mweilguni@sime.com>
    00038  * Fixed a bug in sizeHint()
    00039  * Improved the handling of Motif default buttons
    00040  *
    00041  * 01/09/98  Mario Weilguni <mweilguni@sime.com>
    00042  * The last button was to far right away from the right/bottom border.
    00043  * Fixed this. Removed old code. Buttons get now a minimum width.
    00044  * Programmer may now override minimum width and height of a button.
    00045  *
    00046  */
    00047
    00048 #include "kbuttonbox.moc"
    00049 #include <qpushbutton.h>
    00050 #include <qptrlist.h>
    00051 #include <assert.h>
    00052
    00053 #define minButtonWidth 50
    00054
    00055 class KButtonBox::Item {
    00056 public:
    00057   QPushButton *button;
    00058   bool noexpand;
    00059   unsigned short stretch;
    00060   unsigned short actual_size;
    00061 };
    00062
    00063 template class QPtrList<KButtonBox::Item>;
    00064
    00065 class KButtonBoxPrivate {
    00066 public:
    00067   unsigned short border;
    00068   unsigned short autoborder;
    00069   unsigned short orientation;
    00070   bool activated;
    00071   QPtrList<KButtonBox::Item> buttons;
    00072 };
    00073
    00074 KButtonBox::KButtonBox(QWidget *parent, Orientation _orientation,
    00075                        int border, int autoborder)
    00076   :  QWidget(parent)
    00077 {
    00078   data = new KButtonBoxPrivate;
    00079   assert(data != 0);
    00080
    00081   data->orientation = _orientation;
    00082   data->border = border;
    00083   data->autoborder = autoborder < 0 ? border : autoborder;
    00084   data->buttons.setAutoDelete(TRUE);
    00085 }
    00086
    00087 KButtonBox::~KButtonBox() {
    00088   delete data;
    00089 }
    00090
    00091 QPushButton *KButtonBox::addButton(const QString& text, bool noexpand) {
    00092   Item *item = new Item;
    00093
    00094   item->button = new QPushButton(text, this);
    00095   item->noexpand  = noexpand;
    00096   data->buttons.append(item);
    00097   item->button->adjustSize();
    00098
    00099   return item->button;
    00100 }
    00101
    00102   QPushButton *
    00103 KButtonBox::addButton(
    00104   const QString & text,
    00105   QObject *       receiver,
    00106   const char *    slot,
    00107   bool            noexpand
    00108 )
    00109 {
    00110   QPushButton * pb = addButton(text, noexpand);
    00111
    00112   if ((0 != receiver) && (0 != slot))
    00113     QObject::connect(pb, SIGNAL(clicked()), receiver, slot);
    00114
    00115   return pb;
    00116 }
    00117
    00118
    00119 void KButtonBox::addStretch(int scale) {
    00120   if(scale > 0) {
    00121     Item *item = new Item;
    00122     item->button = 0;
    00123     item->noexpand  = FALSE;
    00124     item->stretch = scale;
    00125     data->buttons.append(item);
    00126   }
    00127 }
    00128
    00129 void KButtonBox::layout() {
    00130   // resize all buttons
    00131   QSize bs = bestButtonSize();
    00132
    00133   for(unsigned int i = 0; i < data->buttons.count(); i++) {
    00134     Item *item = data->buttons.at(i);
    00135     QPushButton *b = item->button;
    00136     if(b != 0) {
    00137       if(item->noexpand)
    00138         b->setFixedSize(buttonSizeHint(b));
    00139       else
    00140         b->setFixedSize(bs);
    00141     }
    00142   }
    00143
    00144   setMinimumSize(sizeHint());
    00145 }
    00146
    00147 void KButtonBox::placeButtons() {
    00148   unsigned int i;
    00149
    00150   if(data->orientation == Horizontal) {
    00151     // calculate free size and stretches
    00152     int fs = width() - 2 * data->border;
    00153     int stretch = 0;
    00154     for(i = 0; i < data->buttons.count(); i++) {
    00155       Item *item = data->buttons.at(i);
    00156       if(item->button != 0) {
    00157         fs -= item->button->width();
    00158
    00159         // Last button?
    00160         if(i != data->buttons.count() - 1)
    00161           fs -= data->autoborder;
    00162       } else
    00163         stretch +=item->stretch;
    00164     }
    00165
    00166     // distribute buttons
    00167     int x_pos = data->border;
    00168     for(i = 0; i < data->buttons.count(); i++) {
    00169       Item *item = data->buttons.at(i);
    00170       if(item->button != 0) {
    00171         QPushButton *b = item->button;
    00172         b->move(x_pos, (height() - b->height()) / 2);
    00173
    00174         x_pos += b->width() + data->autoborder;
    00175       } else
    00176         x_pos += (int)((((double)fs) * item->stretch) / stretch);
    00177     }
    00178   } else { // VERTICAL
    00179     // calcualte free size and stretches
    00180     int fs = height() - 2 * data->border;
    00181     int stretch = 0;
    00182     for(i = 0; i < data->buttons.count(); i++) {
    00183       Item *item = data->buttons.at(i);
    00184       if(item->button != 0)
    00185         fs -= item->button->height() + data->autoborder;
    00186       else
    00187         stretch +=item->stretch;
    00188     }
    00189
    00190     // distribute buttons
    00191     int y_pos = data->border;
    00192     for(i = 0; i < data->buttons.count(); i++) {
    00193       Item *item = data->buttons.at(i);
    00194       if(item->button != 0) {
    00195         QPushButton *b = item->button;
    00196         b->move((width() - b->width()) / 2, y_pos);
    00197
    00198         y_pos += b->height() + data->autoborder;
    00199       } else
    00200         y_pos += (int)((((double)fs) * item->stretch) / stretch);
    00201     }
    00202   }
    00203 }
    00204
    00205 void KButtonBox::resizeEvent(QResizeEvent *) {
    00206   placeButtons();
    00207 }
    00208
    00209 QSize KButtonBox::bestButtonSize() const {
    00210   QSize s(0, 0);
    00211   unsigned int i;
    00212
    00213   // calculate optimal size
    00214   for(i = 0; i < data->buttons.count(); i++) {
    00215     KButtonBox *that = (KButtonBox*)this; // to remove the const ;(
    00216     Item *item = that->data->buttons.at(i);
    00217     QPushButton *b = item->button;
    00218
    00219     if(b != 0 && !item->noexpand) {
    00220       QSize bs = buttonSizeHint(b);
    00221
    00222       if(bs.width() > s.width())
    00223         s.setWidth(bs.width());
    00224       if(bs.height() > s.height())
    00225         s.setHeight(bs.height());
    00226     }
    00227   }
    00228
    00229   return s;
    00230 }
    00231
    00232 QSize KButtonBox::sizeHint() const {
    00233   unsigned int i, dw;
    00234
    00235   if(data->buttons.count() == 0)
    00236     return QSize(0, 0);
    00237   else {
    00238     dw = 2 * data->border;
    00239
    00240     QSize bs = bestButtonSize();
    00241     for(i = 0; i < data->buttons.count(); i++) {
    00242       KButtonBox *that = (KButtonBox*)this;
    00243       Item *item = that->data->buttons.at(i);
    00244       QPushButton *b = item->button;
    00245       if(b != 0) {
    00246         QSize s;
    00247         if(item->noexpand)
    00248           s = that->buttonSizeHint(b);
    00249         else
    00250           s = bs;
    00251
    00252         if(data->orientation == Horizontal)
    00253           dw += s.width();
    00254         else
    00255           dw += s.height();
    00256
    00257         if( i != data->buttons.count() - 1 )
    00258           dw += data->autoborder;
    00259       }
    00260     }
    00261
    00262     if(data->orientation == Horizontal)
    00263         return QSize(dw, bs.height() + 2 * data->border);
    00264     else
    00265         return QSize(bs.width() + 2 * data->border, dw);
    00266   }
    00267 }
    00268
    00269 QSizePolicy KButtonBox::sizePolicy() const
    00270 {
    00271     return data->orientation == Horizontal?
    00272         QSizePolicy( QSizePolicy::Minimum, QSizePolicy::Fixed ) :
    00273         QSizePolicy( QSizePolicy::Fixed, QSizePolicy::Minimum );
    00274 }
    00275
    00276 /*
    00277  * Returns the best size for a button. If a button is less than
    00278  * minButtonWidth pixels wide, return minButtonWidth pixels
    00279  * as minimum width
    00280  */
    00281 QSize KButtonBox::buttonSizeHint(QPushButton *b) const {
    00282   QSize s = b->sizeHint();
    00283   QSize ms = b->minimumSize();
    00284   if(s.width() < minButtonWidth)
    00285     s.setWidth(minButtonWidth);
    00286
    00287   // allows the programmer to override the settings
    00288   if(ms.width() > s.width())
    00289     s.setWidth(ms.width());
    00290   if(ms.height() > s.height())
    00291     s.setHeight(ms.height());
    00292
    00293   return s;
    00294 }
    00295
    00296 void KButtonBox::virtual_hook( int, void* )
    00297 { /*BASE::virtual_hook( id, data );*/ }
    00298

This file is part of the documentation for kdelibs Version 3.1.5.
Documentation copyright © 1996-2002 the KDE developers.
Generated on Wed Jan 28 12:56:14 2004 by doxygen 1.3.4 written by Dimitri van Heesch, © 1997-2001