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Fix the magnifying glass in continuous scroll mode

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This commit is contained in:
luisangelsm
2026-03-05 21:10:52 +01:00
parent 8a2ede1ad4
commit e636406855
3 changed files with 167 additions and 100 deletions
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103
YACReader/magnifying_glass.cpp
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@ -1,10 +1,5 @@
#include "magnifying_glass.h"
#include "viewer.h"
#include "configuration.h"
#include "theme_manager.h"
#include <QScrollBar>
MagnifyingGlass::MagnifyingGlass(int w, int h, float zoomLevel, QWidget *parent)
: QLabel(parent), zoomLevel(zoomLevel)
@ -34,101 +29,9 @@ void MagnifyingGlass::mouseMoveEvent(QMouseEvent *event)
void MagnifyingGlass::updateImage(int x, int y)
{
// image section augmented
int zoomWidth = static_cast<int>(width() * zoomLevel);
int zoomHeight = static_cast<int>(height() * zoomLevel);
auto *const p = qobject_cast<const Viewer *>(parentWidget());
int currentPos = p->verticalScrollBar()->sliderPosition();
const QPixmap image = p->pixmap();
int iWidth = image.width();
int iHeight = image.height();
float wFactor = static_cast<float>(iWidth) / p->widget()->width();
float hFactor = static_cast<float>(iHeight) / p->widget()->height();
zoomWidth *= wFactor;
zoomHeight *= hFactor;
if (p->verticalScrollBar()->minimum() == p->verticalScrollBar()->maximum()) {
int xp = static_cast<int>(((x - p->widget()->pos().x()) * wFactor) - zoomWidth / 2);
int yp = static_cast<int>((y - p->widget()->pos().y() + currentPos) * hFactor - zoomHeight / 2);
int xOffset = 0;
int yOffset = 0;
int zw = zoomWidth;
int zh = zoomHeight;
// int wOffset,hOffset=0;
bool outImage = false;
if (xp < 0) {
xOffset = -xp;
xp = 0;
zw = zw - xOffset;
outImage = true;
}
if (yp < 0) {
yOffset = -yp;
yp = 0;
zh = zh - yOffset;
outImage = true;
}
if (xp + zoomWidth >= image.width()) {
zw -= xp + zw - image.width();
outImage = true;
}
if (yp + zoomHeight >= image.height()) {
zh -= yp + zh - image.height();
outImage = true;
}
if (outImage) {
QImage img(zoomWidth, zoomHeight, QImage::Format_RGB32);
img.setDevicePixelRatio(devicePixelRatioF());
img.fill(Configuration::getConfiguration().getBackgroundColor(ThemeManager::instance().getCurrentTheme().viewer.defaultBackgroundColor));
if (zw > 0 && zh > 0) {
QPainter painter(&img);
painter.drawPixmap(xOffset, yOffset, image.copy(xp, yp, zw, zh));
}
setPixmap(QPixmap().fromImage(img));
} else
setPixmap(image.copy(xp, yp, zoomWidth, zoomHeight));
} else {
int xp = static_cast<int>(((x - p->widget()->pos().x()) * wFactor) - zoomWidth / 2);
int yp = static_cast<int>((y + currentPos) * hFactor - zoomHeight / 2);
int xOffset = 0;
int yOffset = 0;
int zw = zoomWidth;
int zh = zoomHeight;
// int wOffset,hOffset=0;
bool outImage = false;
if (xp < 0) {
xOffset = -xp;
xp = 0;
zw = zw - xOffset;
outImage = true;
}
if (yp < 0) {
yOffset = -yp;
yp = 0;
zh = zh - yOffset;
outImage = true;
}
if (xp + zoomWidth >= image.width()) {
zw -= xp + zw - image.width();
outImage = true;
}
if (yp + zoomHeight >= image.height()) {
zh -= yp + zh - image.height();
outImage = true;
}
if (outImage) {
QImage img(zoomWidth, zoomHeight, QImage::Format_RGB32);
img.setDevicePixelRatio(devicePixelRatioF());
img.fill(Configuration::getConfiguration().getBackgroundColor(ThemeManager::instance().getCurrentTheme().viewer.defaultBackgroundColor));
if (zw > 0 && zh > 0) {
QPainter painter(&img);
painter.drawPixmap(xOffset, yOffset, image.copy(xp, yp, zw, zh));
}
setPixmap(QPixmap().fromImage(img));
} else
setPixmap(image.copy(xp, yp, zoomWidth, zoomHeight));
}
auto *const viewer = qobject_cast<const Viewer *>(parentWidget());
QImage img = viewer->grabMagnifiedRegion(QPoint(x, y), size(), zoomLevel);
setPixmap(QPixmap::fromImage(img));
move(static_cast<int>(x - float(width()) / 2), static_cast<int>(y - float(height()) / 2));
}