kled.cpp
/* This file is part of the KDE libraries
Copyright (C) 1998 Jörg Habenicht (j.habenicht@europemail.com)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#define PAINT_BENCH
#undef PAINT_BENCH
#ifdef PAINT_BENCH
#include <qdatetime.h>
#include <stdio.h>
#endif
#include <qpainter.h>
#include <qimage.h>
#include <qcolor.h>
#include <kapplication.h>
#include <kpixmapeffect.h>
#include "kled.h"
class KLed::KLedPrivate
{
friend class KLed;
int dark_factor;
QColor offcolor;
QPixmap *off_map;
QPixmap *on_map;
};
KLed::KLed(QWidget *parent, const char *name)
: QWidget( parent, name),
led_state(On),
led_look(Raised),
led_shape(Circular)
{
QColor col(green);
d = new KLed::KLedPrivate;
d->dark_factor = 300;
d->offcolor = col.dark(300);
d->off_map = 0;
d->on_map = 0;
setColor(col);
}
KLed::KLed(const QColor& col, QWidget *parent, const char *name)
: QWidget( parent, name),
led_state(On),
led_look(Raised),
led_shape(Circular)
{
d = new KLed::KLedPrivate;
d->dark_factor = 300;
d->offcolor = col.dark(300);
d->off_map = 0;
d->on_map = 0;
setColor(col);
//setShape(Circular);
}
KLed::KLed(const QColor& col, KLed::State state,
KLed::Look look, KLed::Shape shape, QWidget *parent, const char *name )
: QWidget(parent, name),
led_state(state),
led_look(look),
led_shape(shape)
{
d = new KLed::KLedPrivate;
d->dark_factor = 300;
d->offcolor = col.dark(300);
d->off_map = 0;
d->on_map = 0;
//setShape(shape);
setColor(col);
}
KLed::~KLed()
{
delete d->off_map;
delete d->on_map;
delete d;
}
void
KLed::paintEvent(QPaintEvent *)
{
#ifdef PAINT_BENCH
const int rounds = 1000;
QTime t;
t.start();
for (int i=0; i<rounds; i++) {
#endif
switch(led_shape)
{
case Rectangular:
switch (led_look)
{
case Sunken :
paintRectFrame(false);
break;
case Raised :
paintRectFrame(true);
break;
case Flat :
paintRect();
break;
default :
qWarning("%s: in class KLed: no KLed::Look set",qApp->argv()[0]);
}
break;
case Circular:
switch (led_look)
{
case Flat :
paintFlat();
break;
case Raised :
paintRound();
break;
case Sunken :
paintSunken();
break;
default:
qWarning("%s: in class KLed: no KLed::Look set",qApp->argv()[0]);
}
break;
default:
qWarning("%s: in class KLed: no KLed::Shape set",qApp->argv()[0]);
break;
}
#ifdef PAINT_BENCH
}
int ready = t.elapsed();
qWarning("elapsed: %d msec. for %d rounds", ready, rounds);
#endif
}
int
KLed::ensureRoundLed()
{
// Initialize coordinates, width, and height of the LED
//
int width = this->width();
// Make sure the LED is round!
if (width > this->height())
width = this->height();
width -= 2; // leave one pixel border
if (width < 0)
width = 0;
return width;
}
bool
KLed::paintCachedPixmap()
{
if (led_state) {
if (d->on_map) {
QPainter paint(this);
paint.drawPixmap(0, 0, *d->on_map);
return true;
}
} else {
if (d->off_map) {
QPainter paint(this);
paint.drawPixmap(0, 0, *d->off_map);
return true;
}
}
return false;
}
void
KLed::paintFlat() // paint a ROUND FLAT led lamp
{
if (paintCachedPixmap()) return;
QPainter paint;
QColor color;
QBrush brush;
QPen pen;
int width = ensureRoundLed();
int scale = 3;
QPixmap *tmpMap = 0;
width *= scale;
tmpMap = new QPixmap(width + 6, width + 6);
tmpMap->fill(paletteBackgroundColor());
// start painting widget
//
paint.begin(tmpMap);
// Set the color of the LED according to given parameters
color = ( led_state ) ? led_color : d->offcolor;
// Set the brush to SolidPattern, this fills the entire area
// of the ellipse which is drawn with a thin gray "border" (pen)
brush.setStyle( QBrush::SolidPattern );
brush.setColor( color );
pen.setWidth( scale );
color = colorGroup().dark();
pen.setColor( color ); // Set the pen accordingly
paint.setPen( pen ); // Select pen for drawing
paint.setBrush( brush ); // Assign the brush to the painter
// Draws a "flat" LED with the given color:
paint.drawEllipse( scale, scale, width - scale * 2, width - scale * 2 );
paint.end();
//
// painting done
QPixmap *&dest = led_state ? d->on_map : d->off_map;
QImage i = tmpMap->convertToImage();
width /= 3;
i = i.smoothScale(width, width);
delete tmpMap;
dest = new QPixmap(i);
paint.begin(this);
paint.drawPixmap(0, 0, *dest);
paint.end();
}
void
KLed::paintRound() // paint a ROUND RAISED led lamp
{
if (paintCachedPixmap()) return;
QPainter paint;
QColor color;
QBrush brush;
QPen pen;
// Initialize coordinates, width, and height of the LED
int width = ensureRoundLed();
int scale = 3;
QPixmap *tmpMap = 0;
width *= scale;
tmpMap = new QPixmap(width + 6, width + 6);
tmpMap->fill(paletteBackgroundColor());
paint.begin(tmpMap);
// Set the color of the LED according to given parameters
color = ( led_state ) ? led_color : d->offcolor;
// Set the brush to SolidPattern, this fills the entire area
// of the ellipse which is drawn first
brush.setStyle( QBrush::SolidPattern );
brush.setColor( color );
paint.setBrush( brush ); // Assign the brush to the painter
// Draws a "flat" LED with the given color:
paint.drawEllipse( scale, scale, width - scale*2, width - scale*2 );
// Draw the bright light spot of the LED now, using modified "old"
// painter routine taken from KDEUI´s KLed widget:
// Setting the new width of the pen is essential to avoid "pixelized"
// shadow like it can be observed with the old LED code
pen.setWidth( 2 * scale );
// shrink the light on the LED to a size about 2/3 of the complete LED
int pos = width/5 + 1;
int light_width = width;
light_width *= 2;
light_width /= 3;
// Calculate the LED´s "light factor":
int light_quote = (130*2/(light_width?light_width:1))+100;
// Now draw the bright spot on the LED:
while (light_width) {
color = color.light( light_quote ); // make color lighter
pen.setColor( color ); // set color as pen color
paint.setPen( pen ); // select the pen for drawing
paint.drawEllipse( pos, pos, light_width, light_width ); // draw the ellipse (circle)
light_width--;
if (!light_width)
break;
paint.drawEllipse( pos, pos, light_width, light_width );
light_width--;
if (!light_width)
break;
paint.drawEllipse( pos, pos, light_width, light_width );
pos++; light_width--;
}
// Drawing of bright spot finished, now draw a thin gray border
// around the LED; it looks nicer that way. We do this here to
// avoid that the border can be erased by the bright spot of the LED
pen.setWidth( 2 * scale + 1 );
color = colorGroup().dark();
pen.setColor( color ); // Set the pen accordingly
paint.setPen( pen ); // Select pen for drawing
brush.setStyle( QBrush::NoBrush ); // Switch off the brush
paint.setBrush( brush ); // This avoids filling of the ellipse
paint.drawEllipse( 2, 2, width, width );
paint.end();
//
// painting done
QPixmap *&dest = led_state ? d->on_map : d->off_map;
QImage i = tmpMap->convertToImage();
width /= 3;
i = i.smoothScale(width, width);
delete tmpMap;
dest = new QPixmap(i);
paint.begin(this);
paint.drawPixmap(0, 0, *dest);
paint.end();
}
void
KLed::paintSunken() // paint a ROUND SUNKEN led lamp
{
if (paintCachedPixmap()) return;
QPainter paint;
QColor color;
QBrush brush;
QPen pen;
// First of all we want to know what area should be updated
// Initialize coordinates, width, and height of the LED
int width = ensureRoundLed();
int scale = 3;
QPixmap *tmpMap = 0;
width *= scale;
tmpMap = new QPixmap(width, width);
tmpMap->fill(paletteBackgroundColor());
paint.begin(tmpMap);
// Set the color of the LED according to given parameters
color = ( led_state ) ? led_color : d->offcolor;
// Set the brush to SolidPattern, this fills the entire area
// of the ellipse which is drawn first
brush.setStyle( QBrush::SolidPattern );
brush.setColor( color );
paint.setBrush( brush ); // Assign the brush to the painter
// Draws a "flat" LED with the given color:
paint.drawEllipse( scale, scale, width - scale*2, width - scale*2 );
// Draw the bright light spot of the LED now, using modified "old"
// painter routine taken from KDEUI´s KLed widget:
// Setting the new width of the pen is essential to avoid "pixelized"
// shadow like it can be observed with the old LED code
pen.setWidth( 2 * scale );
// shrink the light on the LED to a size about 2/3 of the complete LED
int pos = width/5 + 1;
int light_width = width;
light_width *= 2;
light_width /= 3;
// Calculate the LED´s "light factor":
int light_quote = (130*2/(light_width?light_width:1))+100;
// Now draw the bright spot on the LED:
while (light_width) {
color = color.light( light_quote ); // make color lighter
pen.setColor( color ); // set color as pen color
paint.setPen( pen ); // select the pen for drawing
paint.drawEllipse( pos, pos, light_width, light_width ); // draw the ellipse (circle)
light_width--;
if (!light_width)
break;
paint.drawEllipse( pos, pos, light_width, light_width );
light_width--;
if (!light_width)
break;
paint.drawEllipse( pos, pos, light_width, light_width );
pos++; light_width--;
}
// Drawing of bright spot finished, now draw a thin border
// around the LED which resembles a shadow with light coming
// from the upper left.
pen.setWidth( 2 * scale + 1 ); // ### shouldn't this value be smaller for smaller LEDs?
brush.setStyle( QBrush::NoBrush ); // Switch off the brush
paint.setBrush( brush ); // This avoids filling of the ellipse
// Set the initial color value to colorGroup().light() (bright) and start
// drawing the shadow border at 45° (45*16 = 720).
int angle = -720;
color = colorGroup().light();
for ( int arc = 120; arc < 2880; arc += 240 ) {
pen.setColor( color );
paint.setPen( pen );
int w = width - pen.width()/2 - scale + 1;
paint.drawArc( pen.width()/2, pen.width()/2, w, w, angle + arc, 240 );
paint.drawArc( pen.width()/2, pen.width()/2, w, w, angle - arc, 240 );
color = color.dark( 110 ); //FIXME: this should somehow use the contrast value
} // end for ( angle = 720; angle < 6480; angle += 160 )
paint.end();
//
// painting done
QPixmap *&dest = led_state ? d->on_map : d->off_map;
QImage i = tmpMap->convertToImage();
width /= 3;
i = i.smoothScale(width, width);
delete tmpMap;
dest = new QPixmap(i);
paint.begin(this);
paint.drawPixmap(0, 0, *dest);
paint.end();
}
void
KLed::paintRect()
{
QPainter painter(this);
QBrush lightBrush(led_color);
QBrush darkBrush(d->offcolor);
QPen pen(led_color.dark(300));
int w=width();
int h=height();
// -----
switch(led_state)
{
case On:
painter.setBrush(lightBrush);
painter.drawRect(0, 0, w, h);
break;
case Off:
painter.setBrush(darkBrush);
painter.drawRect(0, 0, w, h);
painter.setPen(pen);
painter.drawLine(0, 0, w, 0);
painter.drawLine(0, h-1, w, h-1);
// Draw verticals
int i;
for(i=0; i < w; i+= 4 /* dx */)
painter.drawLine(i, 1, i, h-1);
break;
default: break;
}
}
void
KLed::paintRectFrame(bool raised)
{
QPainter painter(this);
QBrush lightBrush(led_color);
QBrush darkBrush(d->offcolor);
int w=width();
int h=height();
QColor black=Qt::black;
QColor white=Qt::white;
// -----
if(raised)
{
painter.setPen(white);
painter.drawLine(0, 0, 0, h-1);
painter.drawLine(1, 0, w-1, 0);
painter.setPen(black);
painter.drawLine(1, h-1, w-1, h-1);
painter.drawLine(w-1, 1, w-1, h-1);
painter.fillRect(1, 1, w-2, h-2,
(led_state==On)? lightBrush : darkBrush);
} else {
painter.setPen(black);
painter.drawRect(0,0,w,h);
painter.drawRect(0,0,w-1,h-1);
painter.setPen(white);
painter.drawRect(1,1,w-1,h-1);
painter.fillRect(2, 2, w-4, h-4,
(led_state==On)? lightBrush : darkBrush);
}
}
KLed::State
KLed::state() const
{
return led_state;
}
KLed::Shape
KLed::shape() const
{
return led_shape;
}
QColor
KLed::color() const
{
return led_color;
}
KLed::Look
KLed::look() const
{
return led_look;
}
void
KLed::setState( State state )
{
if (led_state != state)
{
led_state = state;
update();
}
}
void
KLed::toggleState()
{
toggle();
}
void
KLed::setShape(KLed::Shape s)
{
if(led_shape!=s)
{
led_shape = s;
update();
}
}
void
KLed::setColor(const QColor& col)
{
if(led_color!=col) {
if(d->on_map) { delete d->on_map; d->on_map = 0; }
if(d->off_map) { delete d->off_map; d->off_map = 0; }
led_color = col;
d->offcolor = col.dark(d->dark_factor);
update();
}
}
void
KLed::setDarkFactor(int darkfactor)
{
if (d->dark_factor != darkfactor) {
d->dark_factor = darkfactor;
d->offcolor = led_color.dark(darkfactor);
update();
}
}
int
KLed::darkFactor() const
{
return d->dark_factor;
}
void
KLed::setLook( Look look )
{
if(led_look!=look)
{
led_look = look;
update();
}
}
void
KLed::toggle()
{
led_state = (led_state == On) ? Off : On;
// setColor(led_color);
update();
}
void
KLed::on()
{
setState(On);
}
void
KLed::off()
{
setState(Off);
}
QSize
KLed::sizeHint() const
{
return QSize(16, 16);
}
QSize
KLed::minimumSizeHint() const
{
return QSize(16, 16 );
}
void KLed::virtual_hook( int, void* )
{ /*BASE::virtual_hook( id, data );*/ }
#include "kled.moc"
KLed::darkFactor
int darkFactor() const
Returns the factor to darken the LED.
KLed
An LED widget.
Definition: kled.h:45
KLed::setColor
void setColor(const QColor &color)
Set the color of the widget.
Definition: kled.cpp:572
KLed::paintRect
virtual void paintRect()
Paints a rectangular, flat LED.
Definition: kled.cpp:459
KLed::paintRound
virtual void paintRound()
Paints a circular, raised LED.
Definition: kled.cpp:257
KLed::on
void on()
Sets the state of the widget to On.
Definition: kled.cpp:618
KLed::color
QColor color() const
Returns the color of the widget.
KLed::off
void off()
Sets the state of the widget to Off.
Definition: kled.cpp:624
KLed::toggleState
void toggleState() KDE_DEPRECATED
Toggle the state of the LED from Off to On and vice versa.
Definition: kled.cpp:556
KLed::paintFlat
virtual void paintFlat()
Paints a circular, flat LED.
Definition: kled.cpp:199
KLed::toggle
void toggle()
Toggles the state of the led from Off to On or vice versa.
Definition: kled.cpp:610
KLed::look
Look look() const
Returns the look of the widget.
KLed::Look
Look
Displays a flat, round or sunken LED.
Definition: kled.h:89
KLed::KLed
KLed(QWidget *parent=0, const char *name=0)
Constructs a green, round LED widget which will initially be turned on.
Definition: kled.cpp:50
KLed::ensureRoundLed
int ensureRoundLed()
Compute LED width.
Definition: kled.cpp:163
KLed::setShape
void setShape(Shape s)
Set the shape of the LED to s.
Definition: kled.cpp:562
KLed::paintRectFrame
virtual void paintRectFrame(bool raised)
Paints a rectangular LED, either raised or sunken, depending on its argument.
Definition: kled.cpp:490
KLed::setLook
void setLook(Look look)
Sets the color of the widget.
Definition: kled.cpp:600
KLed::state
State state() const
Returns the current state of the widget (on/off).
KLed::State
State
Status of the light is on/off.
Definition: kled.h:61
KLed::setDarkFactor
void setDarkFactor(int darkfactor)
Sets the factor to darken the LED in OFF state.
Definition: kled.cpp:584
KLed::Shape
Shape
Shades of the lamp.
Definition: kled.h:67
KLed::paintSunken
virtual void paintSunken()
Paints a circular, sunken LED.
Definition: kled.cpp:352
KLed::paintCachedPixmap
bool paintCachedPixmap()
Paint the cached antialiased pixmap corresponding to the state if any.
Definition: kled.cpp:179
KLed::~KLed
~KLed()
Destructor.
Definition: kled.cpp:101
KLed::setState
void setState(State state)
Sets the state of the widget to On or Off.
Definition: kled.cpp:546

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