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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Scrollview</h1>
<p>
This example shows how to use Qt's scrollview. This is a widget
optimized for very large contents.
<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/scrollview.cpp 3.0.2 edited Oct 15 22:12 $
**
** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.
**
** This file is part of an example program for Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include <<a href="qscrollview-h.html">qscrollview.h</a>>
#include <<a href="qapplication-h.html">qapplication.h</a>>
#include <<a href="qmenubar-h.html">qmenubar.h</a>>
#include <<a href="qpopupmenu-h.html">qpopupmenu.h</a>>
#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>
#include <<a href="qpainter-h.html">qpainter.h</a>>
#include <<a href="qpixmap-h.html">qpixmap.h</a>>
#include <<a href="qmessagebox-h.html">qmessagebox.h</a>>
#include <<a href="qlayout-h.html">qlayout.h</a>>
#include <<a href="qlabel-h.html">qlabel.h</a>>
#include <<a href="qmultilineedit-h.html">qmultilineedit.h</a>>
#include <<a href="qsizegrip-h.html">qsizegrip.h</a>>
#include <stdlib.h>
static const int style_id = 0x1000;
static const int lw_id = 0x2000;
static const int mlw_id = 0x4000;
static const int mw_id = 0x8000;
static const int max_lw = 16;
static const int max_mlw = 5;
static const int max_mw = 10;
class BigShrinker : public <a href="qframe.html">QFrame</a> {
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
BigShrinker(QWidget* parent) :
<a href="qframe.html">QFrame</a>(parent)
{
setFrameStyle(QFrame::Box|QFrame::Sunken);
int h=35;
int b=0;
for (int y=0; y<2000-h; y+=h+10) {
if (y == 0) {
<a href="qbutton.html">QButton</a>* q=new <a href="qpushbutton.html">QPushButton</a>("Quit", this);
connect(q, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), qApp, SLOT(<a href="qapplication.html#quit">quit</a>()));
} else {
<a href="qstring.html">QString</a> str;
if ( b > 0 ) {
<a name="x508"></a> str.<a href="qstring.html#sprintf">sprintf</a>("Button %d", b++);
} else {
str = "I'm shrinking!";
++b;
}
(new <a href="qpushbutton.html">QPushButton</a>(str, this))->move(y/2,y);
}
}
resize(1000,2000);
startTimer(250);
}
void timerEvent(QTimerEvent*)
{
int w=width();
int h=height();
if ( w > 50 ) w -= 1;
if ( h > 50 ) h -= 2;
resize(w,h);
}
void mouseReleaseEvent(QMouseEvent* e)
{
emit clicked(e->x(), e->y());
}
signals:
void clicked(int,int);
};
class BigMatrix : public <a href="qscrollview.html">QScrollView</a> {
<a href="qmultilineedit.html">QMultiLineEdit</a> *dragging;
public:
BigMatrix(QWidget* parent) :
<a href="qscrollview.html">QScrollView</a>(parent,"matrix", WStaticContents),
bg("bg.ppm")
{
<a name="x493"></a> bg.<a href="qpixmap.html#load">load</a>("bg.ppm");
resizeContents(400000,300000);
dragging = 0;
}
void viewportMousePressEvent(QMouseEvent* e)
{
int x, y;
viewportToContents( e->x(), e->y(), x, y );
dragging = new <a href="qmultilineedit.html">QMultiLineEdit</a>(viewport(),"Another");
dragging-><a href="qtextedit.html#setText">setText</a>("Thanks!");
dragging-><a href="qwidget.html#resize">resize</a>(100,100);
addChild(dragging, x, y);
showChild(dragging);
}
void viewportMouseReleaseEvent(QMouseEvent*)
{
dragging = 0;
}
void viewportMouseMoveEvent(QMouseEvent* e)
{
if ( dragging ) {
int mx, my;
viewportToContents( e->x(), e->y(), mx, my );
int cx = childX(dragging);
int cy = childY(dragging);
int w = mx - cx + 1;
int h = my - cy + 1;
<a href="qstring.html">QString</a> msg;
msg.<a href="qstring.html#sprintf">sprintf</a>("at (%d,%d) %d by %d",cx,cy,w,h);
dragging-><a href="qtextedit.html#setText">setText</a>(msg);
dragging-><a href="qwidget.html#resize">resize</a>(w,h);
}
}
protected:
void drawContents(QPainter* p, int cx, int cy, int cw, int ch)
{
// The Background
<a name="x492"></a> if ( !bg.<a href="qpixmap.html#isNull">isNull</a>() ) {
<a name="x491"></a> int rowheight=bg.<a href="qpixmap.html#height">height</a>();
int toprow=cy/rowheight;
int bottomrow=(cy+ch+rowheight-1)/rowheight;
<a name="x494"></a> int colwidth=bg.<a href="qpixmap.html#width">width</a>();
int leftcol=cx/colwidth;
int rightcol=(cx+cw+colwidth-1)/colwidth;
for (int r=toprow; r<=bottomrow; r++) {
int py=r*rowheight;
for (int c=leftcol; c<=rightcol; c++) {
int px=c*colwidth;
p->drawPixmap(px, py, bg);
}
}
} else {
p->fillRect(cx, cy, cw, ch, QColor(240,222,208));
}
// The Numbers
{
<a href="qfontmetrics.html">QFontMetrics</a> fm=p->fontMetrics();
<a name="x473"></a> int rowheight=fm.<a href="qfontmetrics.html#lineSpacing">lineSpacing</a>();
int toprow=cy/rowheight;
int bottomrow=(cy+ch+rowheight-1)/rowheight;
<a name="x474"></a> int colwidth=fm.<a href="qfontmetrics.html#width">width</a>("00000,000000 ")+3;
int leftcol=cx/colwidth;
int rightcol=(cx+cw+colwidth-1)/colwidth;
<a href="qstring.html">QString</a> str;
for (int r=toprow; r<=bottomrow; r++) {
int py=r*rowheight;
for (int c=leftcol; c<=rightcol; c++) {
int px=c*colwidth;
str.<a href="qstring.html#sprintf">sprintf</a>("%d,%d",c,r);
<a name="x472"></a> p->drawText(px+3, py+fm.<a href="qfontmetrics.html#ascent">ascent</a>(), str);
}
}
// The Big Hint
if (leftcol<10 && toprow<5) {
p->setFont(QFont("Charter",30));
p->setPen(red);
<a href="qstring.html">QString</a> text;
text.<a href="qstring.html#sprintf">sprintf</a>("HINT: Look at %d,%d",215000/colwidth,115000/rowheight);
p->drawText(100,50,text);
}
}
// The Big X
{
if (cx+cw>200000 && cy+ch>100000 && cx<230000 && cy<130000) {
// Note that some X server cannot even handle co-ordinates
// beyond about 4000, so you might not see this.
p->drawLine(200000,100000,229999,129999);
p->drawLine(229999,100000,200000,129999);
// X marks the spot!
p->setFont(QFont("Charter",100));
p->setPen(blue);
p->drawText(215000-500,115000-100,1000,200,AlignCenter,"YOU WIN!!!!!");
}
}
}
private:
<a href="qpixmap.html">QPixmap</a> bg;
};
class ScrollViewExample : public <a href="qwidget.html">QWidget</a> {
Q_OBJECT
public:
ScrollViewExample(int technique, QWidget* parent=0, const char* name=0) :
<a href="qwidget.html">QWidget</a>(parent,name)
{
<a href="qmenubar.html">QMenuBar</a>* menubar = new <a href="qmenubar.html">QMenuBar</a>(this);
<a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( menubar );
<a href="qpopupmenu.html">QPopupMenu</a>* file = new <a href="qpopupmenu.html">QPopupMenu</a>( menubar );
<a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( file );
<a name="x487"></a> menubar-><a href="qmenudata.html#insertItem">insertItem</a>( "&File", file );
file-><a href="qmenudata.html#insertItem">insertItem</a>( "Quit", qApp, SLOT(<a href="qapplication.html#quit">quit</a>()) );
vp_options = new <a href="qpopupmenu.html">QPopupMenu</a>( menubar );
<a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( vp_options );
<a name="x497"></a> vp_options-><a href="qpopupmenu.html#setCheckable">setCheckable</a>( TRUE );
menubar-><a href="qmenudata.html#insertItem">insertItem</a>( "&ScrollView", vp_options );
<a name="x495"></a> connect( vp_options, SIGNAL(<a href="qpopupmenu.html#activated">activated</a>(int)),
this, SLOT(doVPMenuItem(int)) );
vauto_id = vp_options-><a href="qmenudata.html#insertItem">insertItem</a>( "Vertical Auto" );
vaoff_id = vp_options-><a href="qmenudata.html#insertItem">insertItem</a>( "Vertical AlwaysOff" );
vaon_id = vp_options-><a href="qmenudata.html#insertItem">insertItem</a>( "Vertical AlwaysOn" );
<a name="x488"></a> vp_options-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
hauto_id = vp_options-><a href="qmenudata.html#insertItem">insertItem</a>( "Horizontal Auto" );
haoff_id = vp_options-><a href="qmenudata.html#insertItem">insertItem</a>( "Horizontal AlwaysOff" );
haon_id = vp_options-><a href="qmenudata.html#insertItem">insertItem</a>( "Horizontal AlwaysOn" );
vp_options-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
corn_id = vp_options-><a href="qmenudata.html#insertItem">insertItem</a>( "cornerWidget" );
if (technique == 1) {
vp = new <a href="qscrollview.html">QScrollView</a>(this);
<a name="x507"></a> BigShrinker *bs = new BigShrinker(0);//(vp-><a href="qscrollview.html#viewport">viewport</a>());
<a name="x498"></a> vp-><a href="qscrollview.html#addChild">addChild</a>(bs);
<a name="x512"></a> bs-><a href="qwidget.html#setAcceptDrops">setAcceptDrops</a>(TRUE);
QObject::<a href="qobject.html#connect">connect</a>(bs, SIGNAL(clicked(int,int)),
<a name="x499"></a> vp, SLOT(<a href="qscrollview.html#center">center</a>(int,int)));
} else {
vp = new BigMatrix(this);
if ( technique == 3 )
<a name="x501"></a> vp-><a href="qscrollview.html#enableClipper">enableClipper</a>(TRUE);
srand(1);
for (int i=0; i<30; i++) {
<a href="qmultilineedit.html">QMultiLineEdit</a> *l = new <a href="qmultilineedit.html">QMultiLineEdit</a>(vp-><a href="qscrollview.html#viewport">viewport</a>(),"First");
l-><a href="qtextedit.html#setText">setText</a>("Drag out more of these.");
l-><a href="qwidget.html#resize">resize</a>(100,100);
vp-><a href="qscrollview.html#addChild">addChild</a>(l, rand()%800, rand()%10000);
}
vp-><a href="qscrollview.html#viewport">viewport</a>()->setBackgroundMode(NoBackground);
}
f_options = new <a href="qpopupmenu.html">QPopupMenu</a>( menubar );
<a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( f_options );
f_options-><a href="qpopupmenu.html#setCheckable">setCheckable</a>( TRUE );
menubar-><a href="qmenudata.html#insertItem">insertItem</a>( "F&rame", f_options );
connect( f_options, SIGNAL(<a href="qpopupmenu.html#activated">activated</a>(int)),
this, SLOT(doFMenuItem(int)) );
f_options-><a href="qmenudata.html#insertItem">insertItem</a>( "No Frame", style_id );
f_options-><a href="qmenudata.html#insertItem">insertItem</a>( "Box", style_id|QFrame::Box );
f_options-><a href="qmenudata.html#insertItem">insertItem</a>( "Panel", style_id|QFrame::Panel );
f_options-><a href="qmenudata.html#insertItem">insertItem</a>( "WinPanel", style_id|QFrame::WinPanel );
f_options-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
f_options-><a href="qmenudata.html#insertItem">insertItem</a>( "Plain", style_id|QFrame::Plain );
f_options-><a href="qmenudata.html#insertItem">insertItem</a>( "Raised", style_id|QFrame::Raised );
<a name="x486"></a> f_laststyle = f_options-><a href="qmenudata.html#indexOf">indexOf</a>(
f_options-><a href="qmenudata.html#insertItem">insertItem</a>( "Sunken", style_id|QFrame::Sunken ));
f_options-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
lw_options = new <a href="qpopupmenu.html">QPopupMenu</a>( menubar );
<a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( lw_options );
lw_options-><a href="qpopupmenu.html#setCheckable">setCheckable</a>( TRUE );
for (int lw = 1; lw <= max_lw; lw++) {
<a href="qstring.html">QString</a> str;
str.<a href="qstring.html#sprintf">sprintf</a>("%d Pixels", lw);
lw_options-><a href="qmenudata.html#insertItem">insertItem</a>( str, lw_id | lw );
}
f_options-><a href="qmenudata.html#insertItem">insertItem</a>( "Line Width", lw_options );
connect( lw_options, SIGNAL(<a href="qpopupmenu.html#activated">activated</a>(int)),
this, SLOT(doFMenuItem(int)) );
mlw_options = new <a href="qpopupmenu.html">QPopupMenu</a>( menubar );
<a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( mlw_options );
mlw_options-><a href="qpopupmenu.html#setCheckable">setCheckable</a>( TRUE );
for (int mlw = 0; mlw <= max_mlw; mlw++) {
<a href="qstring.html">QString</a> str;
str.<a href="qstring.html#sprintf">sprintf</a>("%d Pixels", mlw);
mlw_options-><a href="qmenudata.html#insertItem">insertItem</a>( str, mlw_id | mlw );
}
f_options-><a href="qmenudata.html#insertItem">insertItem</a>( "Midline Width", mlw_options );
connect( mlw_options, SIGNAL(<a href="qpopupmenu.html#activated">activated</a>(int)),
this, SLOT(doFMenuItem(int)) );
mw_options = new <a href="qpopupmenu.html">QPopupMenu</a>( menubar );
<a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( mw_options );
mw_options-><a href="qpopupmenu.html#setCheckable">setCheckable</a>( TRUE );
for (int mw = 0; mw <= max_mw; mw++) {
<a href="qstring.html">QString</a> str;
str.<a href="qstring.html#sprintf">sprintf</a>("%d Pixels", mw);
mw_options-><a href="qmenudata.html#insertItem">insertItem</a>( str, mw_id | mw );
}
f_options-><a href="qmenudata.html#insertItem">insertItem</a>( "Margin Width", mw_options );
connect( mw_options, SIGNAL(<a href="qpopupmenu.html#activated">activated</a>(int)),
this, SLOT(doFMenuItem(int)) );
setVPMenuItems();
setFMenuItems();
<a href="qvboxlayout.html">QVBoxLayout</a>* vbox = new <a href="qvboxlayout.html">QVBoxLayout</a>(this);
<a name="x484"></a> vbox-><a href="qlayout.html#setMenuBar">setMenuBar</a>(menubar);
<a name="x485"></a> menubar-><a href="qmenubar.html#setSeparator">setSeparator</a>(QMenuBar::InWindowsStyle);
vbox-><a href="qboxlayout.html#addWidget">addWidget</a>(vp);
<a name="x483"></a> vbox-><a href="qlayout.html#activate">activate</a>();
corner = new <a href="qsizegrip.html">QSizeGrip</a>(this);
<a name="x510"></a> corner-><a href="qwidget.html#hide">hide</a>();
}
private slots:
void doVPMenuItem(int id)
{
if (id == vauto_id ) {
<a name="x505"></a> vp-><a href="qscrollview.html#setVScrollBarMode">setVScrollBarMode</a>(QScrollView::Auto);
} else if (id == vaoff_id) {
vp-><a href="qscrollview.html#setVScrollBarMode">setVScrollBarMode</a>(QScrollView::AlwaysOff);
} else if (id == vaon_id) {
vp-><a href="qscrollview.html#setVScrollBarMode">setVScrollBarMode</a>(QScrollView::AlwaysOn);
} else if (id == hauto_id) {
<a name="x504"></a> vp-><a href="qscrollview.html#setHScrollBarMode">setHScrollBarMode</a>(QScrollView::Auto);
} else if (id == haoff_id) {
vp-><a href="qscrollview.html#setHScrollBarMode">setHScrollBarMode</a>(QScrollView::AlwaysOff);
} else if (id == haon_id) {
vp-><a href="qscrollview.html#setHScrollBarMode">setHScrollBarMode</a>(QScrollView::AlwaysOn);
} else if (id == corn_id) {
<a name="x500"></a> bool corn = !vp-><a href="qscrollview.html#cornerWidget">cornerWidget</a>();
<a name="x503"></a> vp-><a href="qscrollview.html#setCornerWidget">setCornerWidget</a>(corn ? corner : 0);
} else {
return; // Not for us to process.
}
setVPMenuItems();
}
void setVPMenuItems()
{
<a name="x506"></a> QScrollView::ScrollBarMode vm = vp-><a href="qscrollview.html#vScrollBarMode">vScrollBarMode</a>();
<a name="x489"></a> vp_options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( vauto_id, vm == QScrollView::Auto );
vp_options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( vaoff_id, vm == QScrollView::AlwaysOff );
vp_options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( vaon_id, vm == QScrollView::AlwaysOn );
<a name="x502"></a> QScrollView::ScrollBarMode hm = vp-><a href="qscrollview.html#hScrollBarMode">hScrollBarMode</a>();
vp_options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( hauto_id, hm == QScrollView::Auto );
vp_options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( haoff_id, hm == QScrollView::AlwaysOff );
vp_options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( haon_id, hm == QScrollView::AlwaysOn );
vp_options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( corn_id, !!vp-><a href="qscrollview.html#cornerWidget">cornerWidget</a>() );
}
void doFMenuItem(int id)
{
if (id & style_id) {
int sty;
if (id == style_id) {
sty = 0;
} else if (id & QFrame::MShape) {
<a name="x475"></a> sty = vp-><a href="qframe.html#frameStyle">frameStyle</a>()&QFrame::MShadow;
sty = (sty ? sty : <a href="qframe.html">QFrame</a>::Plain) | (id&QFrame::MShape);
} else {
sty = vp-><a href="qframe.html#frameStyle">frameStyle</a>()&QFrame::MShape;
sty = (sty ? sty : <a href="qframe.html">QFrame</a>::Box) | (id&QFrame::MShadow);
}
<a name="x479"></a> vp-><a href="qframe.html#setFrameStyle">setFrameStyle</a>(sty);
} else if (id & lw_id) {
<a name="x480"></a> vp-><a href="qframe.html#setLineWidth">setLineWidth</a>(id&~lw_id);
} else if (id & mlw_id) {
<a name="x482"></a> vp-><a href="qframe.html#setMidLineWidth">setMidLineWidth</a>(id&~mlw_id);
} else {
<a name="x481"></a> vp-><a href="qframe.html#setMargin">setMargin</a>(id&~mw_id);
}
<a name="x515"></a> vp-><a href="qwidget.html#update">update</a>();
setFMenuItems();
}
void setFMenuItems()
{
int sty = vp-><a href="qframe.html#frameStyle">frameStyle</a>();
f_options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( style_id, !sty );
for (int i=1; i <= f_laststyle; i++) {
<a name="x496"></a> int id = f_options-><a href="qpopupmenu.html#idAt">idAt</a>(i);
if (id & QFrame::MShape)
f_options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( id,
((id&QFrame::MShape) == (sty&QFrame::MShape)) );
else
f_options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( id,
((id&QFrame::MShadow) == (sty&QFrame::MShadow)) );
}
for (int lw=1; lw<=max_lw; lw++)
<a name="x476"></a> lw_options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( lw_id|lw, vp-><a href="qframe.html#lineWidth">lineWidth</a>() == lw );
for (int mlw=0; mlw<=max_mlw; mlw++)
<a name="x478"></a> mlw_options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( mlw_id|mlw, vp-><a href="qframe.html#midLineWidth">midLineWidth</a>() == mlw );
for (int mw=0; mw<=max_mw; mw++)
<a name="x477"></a> mw_options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( mw_id|mw, vp-><a href="qframe.html#margin">margin</a>() == mw );
}
private:
<a href="qscrollview.html">QScrollView</a>* vp;
<a href="qpopupmenu.html">QPopupMenu</a>* vp_options;
<a href="qpopupmenu.html">QPopupMenu</a>* f_options;
<a href="qpopupmenu.html">QPopupMenu</a>* lw_options;
<a href="qpopupmenu.html">QPopupMenu</a>* mlw_options;
<a href="qpopupmenu.html">QPopupMenu</a>* mw_options;
<a href="qsizegrip.html">QSizeGrip</a>* corner;
int vauto_id, vaoff_id, vaon_id,
hauto_id, haoff_id, haon_id,
corn_id;
int f_laststyle;
};
int main( int argc, char **argv )
{
<a href="qapplication.html">QApplication</a> a( argc, argv );
ScrollViewExample ve1(1,0,"ve1");
ScrollViewExample ve2(2,0,"ve2");
ScrollViewExample ve3(3,0,"ve3");
ve1.<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Scrollviews");
ve1.<a href="qwidget.html#show">show</a>();
ve2.<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Scrollviews");
ve2.<a href="qwidget.html#show">show</a>();
ve3.<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Scrollviews");
ve3.<a href="qwidget.html#show">show</a>();
QObject::<a href="qobject.html#connect">connect</a>(qApp, SIGNAL(<a href="qapplication.html#lastWindowClosed">lastWindowClosed</a>()), qApp, SLOT(<a href="qapplication.html#quit">quit</a>()));
return a.<a href="qapplication.html#exec">exec</a>();
}
#include "scrollview.moc"
</pre>
<p>See also <a href="examples.html">Examples</a>.
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<a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align=right><div align=right>Qt version 3.0.2</div>
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