Differential D25645 Diff 71076 kstars/fitsviewer/fitsview.cpp

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kstars/fitsviewer/fitsview.cpp

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31#include <QtConcurrent> 31​#include <QtConcurrent>
32#include <QScrollBar> 32​#include <QScrollBar>
33#include <QToolBar> 33​#include <QToolBar>
34#include <QGraphicsOpacityEffect> 34​#include <QGraphicsOpacityEffect>
35#include <QApplication> 35​#include <QApplication>
36#include <QGestureEvent> 36​#include <QGestureEvent>
37 37​
38#define BASE_OFFSET 50 38​#define BASE_OFFSET 50
39#define ZOOM_DEFAULT 100.0 39​#define ZOOM_DEFAULT 100.0f
40#define ZOOM_MIN 10 40​#define ZOOM_MIN 10
41#define ZOOM_MAX 400 41​#define ZOOM_MAX 400
42#define ZOOM_LOW_INCR 10 42​#define ZOOM_LOW_INCR 10
43#define ZOOM_HIGH_INCR 50 43​#define ZOOM_HIGH_INCR 50
44 44​
45namespace 45​namespace {
46{ 46​
47​// Derive the Green and Blue stretch parameters from their previous values and the
48​// changes made to the Red parameters. We apply the same offsets used for Red to the
49​// other channels' parameters, but clip them.
50​void ComputeGBStretchParams(const StretchParams &newParams, StretchParams* params) {
51​ float shadow_diff = newParams.grey_red.shadows - params->grey_red.shadows;
52​ float highlight_diff = newParams.grey_red.highlights - params->grey_red.highlights;
53​ float midtones_diff = newParams.grey_red.midtones - params->grey_red.midtones;
54​
55​ params->green.shadows = params->green.shadows + shadow_diff;
56​ params->green.shadows = KSUtils::clamp(params->green.shadows, 0.0f, 1.0f);
57​ params->green.highlights = params->green.highlights + highlight_diff;
58​ params->green.highlights = KSUtils::clamp(params->green.highlights, 0.0f, 1.0f);
59​ params->green.midtones = params->green.midtones + midtones_diff;
60​ params->green.midtones = std::max(params->green.midtones, 0.0f);
61​
62​ params->blue.shadows = params->blue.shadows + shadow_diff;
63​ params->blue.shadows = KSUtils::clamp(params->blue.shadows, 0.0f, 1.0f);
64​ params->blue.highlights = params->blue.highlights + highlight_diff;
65​ params->blue.highlights = KSUtils::clamp(params->blue.highlights, 0.0f, 1.0f);
66​ params->blue.midtones = params->blue.midtones + midtones_diff;
67​ params->blue.midtones = std::max(params->blue.midtones, 0.0f);
68​}
47 69​
48void doStretch(FITSData *data, QImage *outputImage, bool stretchOn) 70​} // namespace
71​
72​// Runs the stretch checking the variables to see which parameters to use.
73​// We call stretch even if we're not stretching, as the stretch code still
74​// converts the image to the uint8 output image which will be displayed.
75​// In that case, it will use an identity stretch.
76​void FITSView::doStretch(FITSData *data, QImage *outputImage)
49{ 77​{
50 if (outputImage->isNull()) 78​ if (outputImage->isNull())
51 return; 79​ return;
52 Stretch stretch(static_cast<int>(data->width()), 80​ Stretch stretch(static_cast<int>(data->width()),
53 static_cast<int>(data->height()), 81​ static_cast<int>(data->height()),
54 data->channels(), data->property("dataType").toInt()); 82​ data->channels(), data->property("dataType").toInt());
55 if (stretchOn) 83​
56 stretch.setParams(stretch.computeParams(data->getImageBuffer())); 84​ StretchParams tempParams;
57 stretch.run(data->getImageBuffer(), outputImage); 85​ if (!stretchImage)
86​ tempParams = StretchParams(); // Keeping it linear
87​ else if (autoStretch)
88​ {
89​ // Compute new auto-stretch params.
90​ stretchParams = stretch.computeParams(data->getImageBuffer());
91​ tempParams = stretchParams;
58} 92​ }
93​ else
94​ // Use the existing stretch params.
95​ tempParams = stretchParams;
59 96​
60} // namespace 97​ stretch.setParams(tempParams);
98​ stretch.run(data->getImageBuffer(), outputImage, sampling);
99​}
100​
101​// Store stretch parameters, and turn on stretching if it isn't already on.
102​void FITSView::setStretchParams(const StretchParams& params)
103​{
104​ if (imageData->channels() == 3)
105​ ComputeGBStretchParams(params, &stretchParams);
106​
107​ stretchParams.grey_red = params.grey_red;
108​ stretchParams.grey_red.shadows = std::max(stretchParams.grey_red.shadows, 0.0f);
109​ stretchParams.grey_red.highlights = std::max(stretchParams.grey_red.highlights, 0.0f);
110​ stretchParams.grey_red.midtones = std::max(stretchParams.grey_red.midtones, 0.0f);
61 111​
112​ autoStretch = false;
113​ stretchImage = true;
114​
115​ if (image_frame != nullptr && rescale(ZOOM_KEEP_LEVEL))
116​ updateFrame();
117​}
118​
119​// Turn on or off stretching, and if on, use whatever parameters are currently stored.
120​void FITSView::setStretch(bool onOff)
121​{
122​ if (stretchImage != onOff)
123​ {
124​ stretchImage = onOff;
125​ if (image_frame != nullptr && rescale(ZOOM_KEEP_LEVEL))
126​ updateFrame();
127​ }
128​}
129​
130​// Turn on stretching, using automatically generated parameters.
131​void FITSView::setAutoStretchParams()
132​{
133​ stretchImage = true;
134​ autoStretch = true;
135​ if (image_frame != nullptr && rescale(ZOOM_KEEP_LEVEL))
136​ updateFrame();
137​}
62 138​
63FITSView::FITSView(QWidget * parent, FITSMode fitsMode, FITSScale filterType) : QScrollArea(parent), zoomFactor(1.2) 139​FITSView::FITSView(QWidget * parent, FITSMode fitsMode, FITSScale filterType) : QScrollArea(parent), zoomFactor(1.2)
64{ 140​{
141​ // stretchImage is whether to stretch or not--the stretch may or may not use automatically generated parameters.
142​ // The user may enter his/her own.
65 stretchImage = Options::autoStretch(); 143​ stretchImage = Options::autoStretch();
144​ // autoStretch means use automatically-generated parameters. This is the default, unless the user overrides
145​ // by adjusting the stretchBar's sliders.
146​ autoStretch = true;
66 147​
67 grabGesture(Qt::PinchGesture); 148​ grabGesture(Qt::PinchGesture);
68 149​
69 image_frame.reset(new FITSLabel(this)); 150​ image_frame.reset(new FITSLabel(this));
70 filter = filterType; 151​ filter = filterType;
71 mode = fitsMode; 152​ mode = fitsMode;
72 153​
73 setBackgroundRole(QPalette::Dark); 154​ setBackgroundRole(QPalette::Dark);
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207 if (setBayerParams) 288​ if (setBayerParams)
208 imageData->setBayerParams(&param); 289​ imageData->setBayerParams(&param);
209 290​
210 fitsWatcher.setFuture(imageData->loadFITS(inFilename, silent)); 291​ fitsWatcher.setFuture(imageData->loadFITS(inFilename, silent));
211} 292​}
212 293​
213bool FITSView::loadFITSFromData(FITSData *data, const QString &inFilename) 294​bool FITSView::loadFITSFromData(FITSData *data, const QString &inFilename)
214{ 295​{
296​ Q_UNUSED(inFilename)
215 if (imageData != nullptr) 297​ if (imageData != nullptr)
216 { 298​ {
217 delete imageData; 299​ delete imageData;
218 imageData = nullptr; 300​ imageData = nullptr;
219 } 301​ }
220 302​
221 if (floatingToolBar != nullptr) 303​ if (floatingToolBar != nullptr)
222 { 304​ {
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235 imageData = data; 317​ imageData = data;
236 318​
237 return processData(); 319​ return processData();
238} 320​}
239 321​
240bool FITSView::processData() 322​bool FITSView::processData()
241{ 323​{
242 // Set current width and height 324​ // Set current width and height
325​ if (!imageData) return false;
243 currentWidth = imageData->width(); 326​ currentWidth = imageData->width();
244 currentHeight = imageData->height(); 327​ currentHeight = imageData->height();
245 328​
246 image_width = currentWidth; 329​ int image_width = currentWidth;
247 image_height = currentHeight; 330​ int image_height = currentHeight;
248 331​
249 image_frame->setSize(image_width, image_height); 332​ image_frame->setSize(image_width, image_height);
250 333​
251 // Init the display image 334​ // Init the display image
252 initDisplayImage(); 335​ initDisplayImage();
253 336​
254 imageData->applyFilter(filter); 337​ imageData->applyFilter(filter);
255 338​
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400 } 483​ }
401} 484​}
402 485​
403template <typename T> 486​template <typename T>
404bool FITSView::rescale(FITSZoom type) 487​bool FITSView::rescale(FITSZoom type)
405{ 488​{
406 if (rawImage.isNull()) 489​ if (rawImage.isNull())
407 return false; 490​ return false;
408 if (true || image_height != imageData->height() || image_width != imageData->width()) ​
409 { ​
410 image_width = imageData->width(); ​
411 image_height = imageData->height(); ​
412 491​
413 initDisplayImage(); 492​ if (!imageData) return false;
493​ int image_width = imageData->width();
494​ int image_height = imageData->height();
495​ currentWidth = image_width;
496​ currentHeight = image_height;
414 497​
415 if (isVisible()) 498​ if (isVisible())
416 emit newStatus(QString("%1x%2").arg(image_width).arg(image_height), FITS_RESOLUTION); 499​ emit newStatus(QString("%1x%2").arg(image_width).arg(image_height), FITS_RESOLUTION);
417 } ​
418 ​
419 image_frame->setScaledContents(true); ​
420 currentWidth = rawImage.width(); ​
421 currentHeight = rawImage.height(); ​
422 ​
423 doStretch(imageData, &rawImage, stretchImage); ​
424 ​
425 scaledImage = QImage(); ​
426 500​
427 switch (type) 501​ switch (type)
428 { 502​ {
429 case ZOOM_FIT_WINDOW: 503​ case ZOOM_FIT_WINDOW:
430 if ((rawImage.width() > width() || rawImage.height() > height())) 504​ if ((image_width > width() || image_height > height()))
431 { 505​ {
432 double w = baseSize().width() - BASE_OFFSET; 506​ double w = baseSize().width() - BASE_OFFSET;
433 double h = baseSize().height() - BASE_OFFSET; 507​ double h = baseSize().height() - BASE_OFFSET;
434 508​
435 if (!firstLoad) 509​ if (!firstLoad)
436 { 510​ {
437 w = viewport()->rect().width() - BASE_OFFSET; 511​ w = viewport()->rect().width() - BASE_OFFSET;
438 h = viewport()->rect().height() - BASE_OFFSET; 512​ h = viewport()->rect().height() - BASE_OFFSET;
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465 break; 539​ break;
466 540​
467 default: 541​ default:
468 currentZoom = 100; 542​ currentZoom = 100;
469 543​
470 break; 544​ break;
471 } 545​ }
472 546​
547​ initDisplayImage();
548​ image_frame->setScaledContents(true);
549​ doStretch(imageData, &rawImage);
550​ scaledImage = QImage();
473 setWidget(image_frame.get()); 551​ setWidget(image_frame.get());
474 552​
475 if (type != ZOOM_KEEP_LEVEL) 553​ // This is needed by fitstab, even if the zoom doesn't change, to change the stretch UI.
476 emit newStatus(QString("%1%").arg(currentZoom), FITS_ZOOM); 554​ emit newStatus(QString("%1%").arg(currentZoom), FITS_ZOOM);
477 555​
478 return true; 556​ return true;
479} 557​}
480 558​
481void FITSView::ZoomIn() 559​void FITSView::ZoomIn()
482{ 560​{
483 if (currentZoom >= ZOOM_DEFAULT && Options::limitedResourcesMode()) 561​ if (currentZoom >= ZOOM_DEFAULT && Options::limitedResourcesMode())
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493 571​
494 emit actionUpdated("view_zoom_out", true); 572​ emit actionUpdated("view_zoom_out", true);
495 if (currentZoom >= ZOOM_MAX) 573​ if (currentZoom >= ZOOM_MAX)
496 { 574​ {
497 currentZoom = ZOOM_MAX; 575​ currentZoom = ZOOM_MAX;
498 emit actionUpdated("view_zoom_in", false); 576​ emit actionUpdated("view_zoom_in", false);
499 } 577​ }
500 578​
501 currentWidth = image_width * (currentZoom / ZOOM_DEFAULT); 579​ if (!imageData) return;
502 currentHeight = image_height * (currentZoom / ZOOM_DEFAULT); 580​ currentWidth = imageData->width() * (currentZoom / ZOOM_DEFAULT);
581​ currentHeight = imageData->height() * (currentZoom / ZOOM_DEFAULT);
503 582​
504 updateFrame(); 583​ updateFrame();
505 584​
506 emit newStatus(QString("%1%").arg(currentZoom), FITS_ZOOM); 585​ emit newStatus(QString("%1%").arg(currentZoom), FITS_ZOOM);
507} 586​}
508 587​
509void FITSView::ZoomOut() 588​void FITSView::ZoomOut()
510{ 589​{
511 if (currentZoom <= ZOOM_DEFAULT) 590​ if (currentZoom <= ZOOM_DEFAULT)
512 currentZoom -= ZOOM_LOW_INCR; 591​ currentZoom -= ZOOM_LOW_INCR;
513 else 592​ else
514 currentZoom -= ZOOM_HIGH_INCR; 593​ currentZoom -= ZOOM_HIGH_INCR;
515 594​
516 if (currentZoom <= ZOOM_MIN) 595​ if (currentZoom <= ZOOM_MIN)
517 { 596​ {
518 currentZoom = ZOOM_MIN; 597​ currentZoom = ZOOM_MIN;
519 emit actionUpdated("view_zoom_out", false); 598​ emit actionUpdated("view_zoom_out", false);
520 } 599​ }
521 600​
522 emit actionUpdated("view_zoom_in", true); 601​ emit actionUpdated("view_zoom_in", true);
523 602​
524 currentWidth = image_width * (currentZoom / ZOOM_DEFAULT); 603​ if (!imageData) return;
525 currentHeight = image_height * (currentZoom / ZOOM_DEFAULT); 604​ currentWidth = imageData->width() * (currentZoom / ZOOM_DEFAULT);
605​ currentHeight = imageData->height() * (currentZoom / ZOOM_DEFAULT);
526 606​
527 updateFrame(); 607​ updateFrame();
528 608​
529 emit newStatus(QString("%1%").arg(currentZoom), FITS_ZOOM); 609​ emit newStatus(QString("%1%").arg(currentZoom), FITS_ZOOM);
530} 610​}
531 611​
532void FITSView::ZoomToFit() 612​void FITSView::ZoomToFit()
533{ 613​{
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601void FITSView::ZoomDefault() 681​void FITSView::ZoomDefault()
602{ 682​{
603 if (image_frame != nullptr) 683​ if (image_frame != nullptr)
604 { 684​ {
605 emit actionUpdated("view_zoom_out", true); 685​ emit actionUpdated("view_zoom_out", true);
606 emit actionUpdated("view_zoom_in", true); 686​ emit actionUpdated("view_zoom_in", true);
607 687​
608 currentZoom = ZOOM_DEFAULT; 688​ currentZoom = ZOOM_DEFAULT;
609 currentWidth = image_width; 689​ currentWidth = imageData->width();
610 currentHeight = image_height; 690​ currentHeight = imageData->height();
611 691​
612 updateFrame(); 692​ updateFrame();
613 693​
614 emit newStatus(QString("%1%").arg(currentZoom), FITS_ZOOM); 694​ emit newStatus(QString("%1%").arg(currentZoom), FITS_ZOOM);
615 695​
616 update(); 696​ update();
617 } 697​ }
618} 698​}
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741} 821​}
742 822​
743/** 823​/**
744This Method draws a large Crosshair in the center of the image, it is like a set of axes. 824​This Method draws a large Crosshair in the center of the image, it is like a set of axes.
745 */ 825​ */
746 826​
747void FITSView::drawCrosshair(QPainter * painter) 827​void FITSView::drawCrosshair(QPainter * painter)
748{ 828​{
829​ if (!imageData) return;
830​ int image_width = imageData->width();
831​ int image_height = imageData->height();
749 float scale = (currentZoom / ZOOM_DEFAULT); 832​ float scale = (currentZoom / ZOOM_DEFAULT);
750 QPointF c = QPointF((qreal)image_width / 2 * scale, (qreal)image_height / 2 * scale); 833​ QPointF c = QPointF((qreal)image_width / 2 * scale, (qreal)image_height / 2 * scale);
751 float midX = (float)image_width / 2 * scale; 834​ float midX = (float)image_width / 2 * scale;
752 float midY = (float)image_height / 2 * scale; 835​ float midY = (float)image_height / 2 * scale;
753 float maxX = (float)image_width * scale; 836​ float maxX = (float)image_width * scale;
754 float maxY = (float)image_height * scale; 837​ float maxY = (float)image_height * scale;
755 float r = 50 * scale; 838​ float r = 50 * scale;
756 839​
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779Finally it draws the gridlines so that there will be 4 Gridlines on either side of the axes. 862​Finally it draws the gridlines so that there will be 4 Gridlines on either side of the axes.
780Note: This has to start drawing at the center not at the edges because the center axes must 863​Note: This has to start drawing at the center not at the edges because the center axes must
781be in the center of the image. 864​be in the center of the image.
782 */ 865​ */
783 866​
784void FITSView::drawPixelGrid(QPainter * painter) 867​void FITSView::drawPixelGrid(QPainter * painter)
785{ 868​{
786 float scale = (currentZoom / ZOOM_DEFAULT); 869​ float scale = (currentZoom / ZOOM_DEFAULT);
787 double width = image_width * scale; 870​ float width = imageData->width() * scale;
788 double height = image_height * scale; 871​ float height = imageData->height() * scale;
789 double cX = width / 2; 872​ float cX = width / 2;
790 double cY = height / 2; 873​ float cY = height / 2;
791 double deltaX = width / 10; 874​ float deltaX = width / 10;
792 double deltaY = height / 10; 875​ float deltaY = height / 10;
793 //draw the Axes 876​ //draw the Axes
794 painter->setPen(QPen(Qt::red)); 877​ painter->setPen(QPen(Qt::red));
795 painter->drawText(cX - 30, height - 5, QString::number((int)((cX) / scale))); 878​ painter->drawText(cX - 30, height - 5, QString::number((int)((cX) / scale)));
796 painter->drawText(width - 30, cY - 5, QString::number((int)((cY) / scale))); 879​ painter->drawText(width - 30, cY - 5, QString::number((int)((cY) / scale)));
797 if (!showCrosshair) 880​ if (!showCrosshair)
798 { 881​ {
799 painter->drawLine(cX, 0, cX, height); 882​ painter->drawLine(cX, 0, cX, height);
800 painter->drawLine(0, cY, width, cY); 883​ painter->drawLine(0, cY, width, cY);
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841It determines the minimum and maximum RA and DEC, then it uses that information to 924​It determines the minimum and maximum RA and DEC, then it uses that information to
842judge which gridLines to draw. Then it calls the drawEQGridlines methods below 925​judge which gridLines to draw. Then it calls the drawEQGridlines methods below
843to draw gridlines at those specific RA and Dec values. 926​to draw gridlines at those specific RA and Dec values.
844 */ 927​ */
845 928​
846void FITSView::drawEQGrid(QPainter * painter) 929​void FITSView::drawEQGrid(QPainter * painter)
847{ 930​{
848 float scale = (currentZoom / ZOOM_DEFAULT); 931​ float scale = (currentZoom / ZOOM_DEFAULT);
932​ int image_width = imageData->width();
933​ int image_height = imageData->height();
849 934​
850 if (imageData->hasWCS()) 935​ if (imageData->hasWCS())
851 { 936​ {
852 wcs_point * wcs_coord = imageData->getWCSCoord(); 937​ wcs_point * wcs_coord = imageData->getWCSCoord();
853 if (wcs_coord != nullptr) 938​ if (wcs_coord != nullptr)
854 { 939​ {
855 int size = image_width * image_height; 940​ int size = image_width * image_height;
856 double maxRA = -1000; 941​ double maxRA = -1000;
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1028 } 1113​ }
1029 } 1114​ }
1030 } 1115​ }
1031 } 1116​ }
1032} 1117​}
1033 1118​
1034bool FITSView::pointIsInImage(QPointF pt, bool scaled) 1119​bool FITSView::pointIsInImage(QPointF pt, bool scaled)
1035{ 1120​{
1121​ int image_width = imageData->width();
1122​ int image_height = imageData->height();
1036 float scale = (currentZoom / ZOOM_DEFAULT); 1123​ float scale = (currentZoom / ZOOM_DEFAULT);
1037 if (scaled) 1124​ if (scaled)
1038 return pt.x() < image_width * scale && pt.y() < image_height * scale && pt.x() > 0 && pt.y() > 0; 1125​ return pt.x() < image_width * scale && pt.y() < image_height * scale && pt.x() > 0 && pt.y() > 0;
1039 else 1126​ else
1040 return pt.x() < image_width && pt.y() < image_height && pt.x() > 0 && pt.y() > 0; 1127​ return pt.x() < image_width && pt.y() < image_height && pt.x() > 0 && pt.y() > 0;
1041} 1128​}
1042 1129​
1043QPointF FITSView::getPointForGridLabel() 1130​QPointF FITSView::getPointForGridLabel()
1044{ 1131​{
1132​ int image_width = imageData->width();
1133​ int image_height = imageData->height();
1045 float scale = (currentZoom / ZOOM_DEFAULT); 1134​ float scale = (currentZoom / ZOOM_DEFAULT);
1046 1135​
1047 //These get the maximum X and Y points in the list that are in the image 1136​ //These get the maximum X and Y points in the list that are in the image
1048 QPointF maxXPt(image_width * scale / 2, image_height * scale / 2); 1137​ QPointF maxXPt(image_width * scale / 2, image_height * scale / 2);
1049 for (auto &p : eqGridPoints) 1138​ for (auto &p : eqGridPoints)
1050 { 1139​ {
1051 if (p.x() > maxXPt.x() && pointIsInImage(p, true)) 1140​ if (p.x() > maxXPt.x() && pointIsInImage(p, true))
1052 maxXPt = p; 1141​ maxXPt = p;
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1448 double scale = (currentZoom / ZOOM_DEFAULT); 1537​ double scale = (currentZoom / ZOOM_DEFAULT);
1449 QPoint widgetPoint = w->mapFromParent(viewPortPoint); 1538​ QPoint widgetPoint = w->mapFromParent(viewPortPoint);
1450 QPoint imagePoint = QPoint(widgetPoint.x() / scale, widgetPoint.y() / scale); 1539​ QPoint imagePoint = QPoint(widgetPoint.x() / scale, widgetPoint.y() / scale);
1451 return imagePoint; 1540​ return imagePoint;
1452} 1541​}
1453 1542​
1454void FITSView::initDisplayImage() 1543​void FITSView::initDisplayImage()
1455{ 1544​{
1545​ // Account for leftover when sampling. Thus a 5-wide image sampled by 2
1546​ // would result in a width of 3 (samples 0, 2 and 4).
1547​ int w = (imageData->width() + sampling - 1) / sampling;
1548​ int h = (imageData->height() + sampling - 1) / sampling;
1456 if (imageData->channels() == 1) 1549​ if (imageData->channels() == 1)
1457 { 1550​ {
1458 rawImage = QImage(image_width, image_height, QImage::Format_Indexed8); 1551​ rawImage = QImage(w, h, QImage::Format_Indexed8);
1459 1552​
1460 rawImage.setColorCount(256); 1553​ rawImage.setColorCount(256);
1461 for (int i = 0; i < 256; i++) 1554​ for (int i = 0; i < 256; i++)
1462 rawImage.setColor(i, qRgb(i, i, i)); 1555​ rawImage.setColor(i, qRgb(i, i, i));
1463 } 1556​ }
1464 else 1557​ else
1465 { 1558​ {
1466 rawImage = QImage(image_width, image_height, QImage::Format_RGB32); 1559​ rawImage = QImage(w, h, QImage::Format_RGB32);
1467 } 1560​ }
1468} 1561​}
1469 1562​
1470/** 1563​/**
1471The Following two methods allow gestures to work with trackpads. 1564​The Following two methods allow gestures to work with trackpads.
1472Specifically, we are targeting the pinch events, so that if one is generated, 1565​Specifically, we are targeting the pinch events, so that if one is generated,
1473Then the pinchTriggered method will be called. If the event is not a pinch gesture, 1566​Then the pinchTriggered method will be called. If the event is not a pinch gesture,
1474then the event is passed back to the other event handlers. 1567​then the event is passed back to the other event handlers.
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