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# marginpreview.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., 59 Temple Place - Suite 330,
    00017  *  Boston, MA 02111-1307, USA.
    00018  **/
    00019
    00020 #include "marginpreview.h"
    00021
    00022 #include <klocale.h>
    00023 #include <kdebug.h>
    00024 #include <qpainter.h>
    00025 #include <kcursor.h>
    00026
    00027 #define A4_WIDTH    595
    00028 #define A4_HEIGHT   842
    00029 #define A4_TOP      36
    00030 #define A4_BOTTOM   806
    00031 #define A4_LEFT     18
    00032 #define A4_RIGHT    577
    00033
    00034 #define SCALE(d,z)  ((int)(float(d)*z+0.5))
    00035 #define UNSCALE(d,z)    ((int)(float(d)/z+0.5))
    00036
    00037 static void draw3DPage(QPainter *p, QRect r)
    00038 {
    00039     // draw white page
    00040     p->fillRect(r,Qt::white);
    00041     // draw 3D border
    00042     p->setPen(Qt::black);
    00043     p->moveTo(r.left(),r.bottom());
    00044     p->lineTo(r.right(),r.bottom());
    00045     p->lineTo(r.right(),r.top());
    00046     p->setPen(Qt::darkGray);
    00047     p->lineTo(r.left(),r.top());
    00048     p->lineTo(r.left(),r.bottom());
    00049     p->setPen(Qt::gray);
    00050     p->moveTo(r.left()+1,r.bottom()-1);
    00051     p->lineTo(r.right()-1,r.bottom()-1);
    00052     p->lineTo(r.right()-1,r.top()+1);
    00053 }
    00054
    00055 MarginPreview::MarginPreview(QWidget *parent, const char *name)
    00056     : QWidget(parent,name)
    00057 {
    00058     width_ = A4_WIDTH;
    00059     height_ = A4_HEIGHT;
    00060     top_ = A4_TOP;
    00061     bottom_ = A4_BOTTOM;
    00062     left_ = A4_LEFT;
    00063     right_ = A4_RIGHT;
    00064     nopreview_ = false;
    00065
    00066     box_ = rect();
    00067     zoom_ = 1.0;
    00068     state_ = Fixed;
    00069     oldpos_ = -1;
    00070     symetric_ = false;
    00071
    00072     setMouseTracking(true);
    00073 }
    00074
    00075 MarginPreview::~MarginPreview()
    00076 {
    00077 }
    00078
    00079 void MarginPreview::setPageSize(float w, float h)
    00080 {
    00081     setNoPreview(w <= 0 && h <= 0);
    00082     // do not change relative margins when changing page size !!
    00083     float   old_b(height_-bottom_), old_r(width_-right_);
    00084     width_ = w;
    00085     height_ = h;
    00086     resizeEvent(NULL);
    00087     setMargins(top_,old_b,left_,old_r);
    00088     update();
    00089 }
    00090
    00091 void MarginPreview::setMargins(float t, float b, float l, float r)
    00092 {
    00093     top_ = t;
    00094     left_ = l;
    00095     bottom_ = height_-b;
    00096     right_ = width_-r;
    00097     update();
    00098 }
    00099
    00100 void MarginPreview::setSymetric(bool on)
    00101 {
    00102     symetric_ = on;
    00103 }
    00104
    00105 void MarginPreview::resizeEvent(QResizeEvent *)
    00106 {
    00107     if (width_/height_ > float(width())/height())
    00108     {
    00109         zoom_ = float(width()-3)/width_;
    00110         box_.setLeft(1);
    00111         box_.setRight(width()-3);
    00112         int m = (height()-3-SCALE(height_,zoom_))/2;
    00113         box_.setTop(m+1);
    00114         box_.setBottom(height()-m-3);
    00115     }
    00116     else
    00117     {
    00118         zoom_ = float(height()-3)/height_;
    00119         box_.setTop(1);
    00120         box_.setBottom(height()-3);
    00121         int m = (width()-3-SCALE(width_,zoom_))/2;
    00122         box_.setLeft(m+1);
    00123         box_.setRight(width()-m-3);
    00124     }
    00125 }
    00126
    00127 void MarginPreview::paintEvent(QPaintEvent *)
    00128 {
    00129     QPainter    p(this);
    00130
    00131     QRect   pagebox(QPoint(box_.left()-1,box_.top()-1),QPoint(box_.right()+2,box_.bottom()+2));
    00132
    00133     if (nopreview_)
    00134     {
    00135         p.drawText(pagebox,AlignCenter,i18n("No preview available"));
    00136     }
    00137     else
    00138     {
    00139         draw3DPage(&p,pagebox);
    00140
    00141         // draw margins
    00142         p.setPen(DotLine);
    00143         int m = box_.left()+SCALE(left_,zoom_);
    00144         margbox_.setLeft(m+1);
    00145         p.drawLine(m,box_.top(),m,box_.bottom());
    00146         m = box_.left()+SCALE(right_,zoom_);
    00147         margbox_.setRight(m-1);
    00148         p.drawLine(m,box_.top(),m,box_.bottom());
    00149         m = box_.top()+SCALE(top_,zoom_);
    00150         margbox_.setTop(m+1);
    00151         p.drawLine(box_.left(),m,box_.right(),m);
    00152         m = box_.top()+SCALE(bottom_,zoom_);
    00153         margbox_.setBottom(m-1);
    00154         p.drawLine(box_.left(),m,box_.right(),m);
    00155
    00156         // fill useful area
    00157         p.fillRect(margbox_,QColor(220,220,220));
    00158     }
    00159 }
    00160
    00161 void MarginPreview::setNoPreview(bool on)
    00162 {
    00163     nopreview_ = on;
    00164     update();
    00165 }
    00166
    00167 // 0: nothing
    00168 // 1: top
    00169 // 2: bottom
    00170 // 3: left
    00171 // 4: right
    00172 int MarginPreview::locateMouse(const QPoint& p)
    00173 {
    00174     int tol = 2;
    00175     if (p.x() <= margbox_.left()+tol && p.x() >= margbox_.left()-tol)
    00176         return LMoving;
    00177     else if (p.x() <= margbox_.right()+tol && p.x() >= margbox_.right()-tol)
    00178         return RMoving;
    00179     else if (p.y() <= margbox_.top()+tol && p.y() >= margbox_.top()-tol)
    00180         return TMoving;
    00181     else if (p.y() <= margbox_.bottom()+tol && p.y() >= margbox_.bottom()-tol)
    00182         return BMoving;
    00183     else
    00184         return 0;
    00185 }
    00186
    00187 void MarginPreview::mouseMoveEvent(QMouseEvent *e)
    00188 {
    00189     if (nopreview_ || state_ == Fixed)
    00190         return;
    00191     int pos = locateMouse(e->pos());
    00192     if (state_ == None && e->button() == Qt::NoButton)
    00193     {
    00194         switch (pos)
    00195         {
    00196             case 1:
    00197             case 2:
    00198                 setCursor(KCursor::sizeVerCursor());
    00199                 break;
    00200             case 3:
    00201             case 4:
    00202                 setCursor(KCursor::sizeHorCursor());
    00203                 break;
    00204             default:
    00205                 setCursor(KCursor::arrowCursor());
    00206                 break;
    00207         }
    00208     }
    00209     else if (state_ > None)
    00210     {
    00211         int newpos = -1;
    00212         switch (state_)
    00213         {
    00214             case TMoving:
    00215                 newpos = QMIN(QMAX(e->pos().y(), box_.top()), (symetric_ ? (box_.top()+box_.bottom())/2 : margbox_.bottom()+1));
    00216                 break;
    00217             case BMoving:
    00218                 newpos = QMIN(QMAX(e->pos().y(), (symetric_? (box_.top()+box_.bottom()+1)/2 : margbox_.top()-1)), box_.bottom());
    00219                 break;
    00220             case LMoving:
    00221                 newpos = QMIN(QMAX(e->pos().x(), box_.left()), (symetric_ ? (box_.left()+box_.right())/2 : margbox_.right()+1));
    00222                 break;
    00223             case RMoving:
    00224                 newpos = QMIN(QMAX(e->pos().x(), (symetric_ ? (box_.left()+box_.right()+1)/2 : margbox_.left()-1)), box_.right());
    00225                 break;
    00226         }
    00227         if (newpos != oldpos_)
    00228         {
    00229             QPainter    p(this);
    00230             p.setRasterOp(Qt::XorROP);
    00231             p.setPen(gray);
    00232             for (int i=0; i<2; i++, oldpos_ = newpos)
    00233             {
    00234                 if (oldpos_ >= 0)
    00235                     drawTempLine(&p);
    00236             }
    00237         }
    00238     }
    00239 }
    00240
    00241 void MarginPreview::drawTempLine(QPainter *p)
    00242 {
    00243     if (state_ >= LMoving)
    00244     {
    00245         p->drawLine(oldpos_, box_.top(), oldpos_, box_.bottom());
    00246         if (symetric_)
    00247         {
    00248             int mirror = box_.left()+box_.right()-oldpos_;
    00249             p->drawLine(mirror, box_.top(), mirror, box_.bottom());
    00250         }
    00251     }
    00252     else
    00253     {
    00254         p->drawLine(box_.left(), oldpos_, box_.right(), oldpos_);
    00255         if (symetric_)
    00256         {
    00257             int mirror = box_.top()+box_.bottom()-oldpos_;
    00258             p->drawLine(box_.left(), mirror, box_.right(), mirror);
    00259         }
    00260     }
    00261 }
    00262
    00263 void MarginPreview::mousePressEvent(QMouseEvent *e)
    00264 {
    00265     if (e->button() != Qt::LeftButton || state_ != None)
    00266         return;
    00267     int mpos = locateMouse(e->pos());
    00268     if (mpos)
    00269     {
    00270         state_ = mpos;
    00271     }
    00272 }
    00273
    00274 void MarginPreview::mouseReleaseEvent(QMouseEvent *e)
    00275 {
    00276     if (state_ > None)
    00277     {
    00278         QPainter    p(this);
    00279         p.setRasterOp(Qt::XorROP);
    00280         p.setPen(gray);
    00281         if (oldpos_ >= 0)
    00282         {
    00283             drawTempLine(&p);
    00284             if (e)
    00285             {
    00286                 float   val = 0;
    00287                 int st(state_);
    00288                 if (symetric_ && (st == BMoving || st == RMoving))
    00289                     st--;
    00290                 switch (st)
    00291                 {
    00292                     case TMoving:
    00293                         val = top_ = UNSCALE(oldpos_-box_.top(), zoom_);
    00294                         if (symetric_)
    00295                             bottom_ = height_-top_;
    00296                         break;
    00297                     case BMoving:
    00298                         bottom_ = UNSCALE(oldpos_-box_.top(), zoom_);
    00299                         val = UNSCALE(box_.bottom()-oldpos_, zoom_);
    00300                         break;
    00301                     case LMoving:
    00302                         val = left_ = UNSCALE(oldpos_-box_.left(), zoom_);
    00303                         if (symetric_)
    00304                             right_ = width_-left_;
    00305                         break;
    00306                     case RMoving:
    00307                         right_ = UNSCALE(oldpos_-box_.left(), zoom_);
    00308                         val = UNSCALE(box_.right()-oldpos_, zoom_);
    00309                         break;
    00310                 }
    00311                 update();
    00312                 emit marginChanged(st, val);
    00313             }
    00314         }
    00315         state_ = 0;
    00316         oldpos_ = -1;
    00317     }
    00318 }
    00319
    00320 void MarginPreview::enableRubberBand(bool on)
    00321 {
    00322     if (on && state_ == Fixed)
    00323         state_ = None;
    00324     else if (!on && state_ > Fixed)
    00325     {
    00326         mouseReleaseEvent(NULL);
    00327         state_ = Fixed;
    00328     }
    00329 }
    00330
    00331 #include "marginpreview.moc"

This file is part of the documentation for kdeprint Library Version 3.4.1.
Documentation copyright © 1996-2004 the KDE developers.
Generated on Sat Jun 11 20:31:05 2005 by doxygen 1.4.1 written by Dimitri van Heesch, © 1997-2003