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# Copyright (C) 2025 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from __future__ import annotations
import math
from PySide6.QtWidgets import QLabel
from PySide6.QtCore import Qt, QDir, QSizeF
from PySide6.QtGui import (QPixmap, QImageReader, QIcon, QKeySequence,
QGuiApplication, QColorSpace, QPainter, QAction)
from abstractviewer import AbstractViewer
def imageFormats():
result = []
all_formats = QImageReader.supportedImageFormats()
for format_bytes in all_formats:
format_str = bytes(format_bytes).decode("utf-8") # Convert QByteArray to str
if format_str not in ["tif", "cur"]: # Exclude duplicate/non-existent formats
result.append(f"image/{format_str}")
return result
def msgOpen(name, image):
description = image.colorSpace().description() if image.colorSpace().isValid() else "unknown"
return 'Opened "{0}", {1}x{2}, Depth: {3} ({4})'.format(
QDir.toNativeSeparators(name),
image.width(),
image.height(),
image.depth(),
description
)
class ImageViewer(AbstractViewer):
def __init__(self):
super().__init__()
self.formats = imageFormats()
self.uiInitialized.connect(self.setupImageUi)
QImageReader.setAllocationLimit(1024) # MB
def init(self, file, parent, mainWindow):
self.image_label = QLabel(parent)
self.image_label.setFrameShape(QLabel.Box)
self.image_label.setAlignment(Qt.AlignCenter)
self.image_label.setScaledContents(True)
# AbstractViewer.init(file, self.image_label, mainWindow)
super().init(file, self.image_label, mainWindow)
self.tool_bar = self.addToolBar(self.tr("Images"))
icon = QIcon.fromTheme(QIcon.ThemeIcon.ZoomIn,
QIcon(":/demos/documentviewer/images/zoom-in.png"))
self.zoom_in_act = QAction(icon, "Zoom &In", self)
self.zoom_in_act.setShortcut(QKeySequence.StandardKey.ZoomIn)
self.zoom_in_act.triggered.connect(self.zoomIn)
self.tool_bar.addAction(self.zoom_in_act)
icon = QIcon.fromTheme(QIcon.ThemeIcon.ZoomOut,
QIcon(":/demos/documentviewer/images/zoom-out.png"))
self.zoom_out_act = QAction(icon, "Zoom &Out", self)
self.zoom_out_act.setShortcut(QKeySequence.StandardKey.ZoomOut)
self.zoom_out_act.triggered.connect(self.zoomOut)
self.tool_bar.addAction(self.zoom_out_act)
icon = QIcon.fromTheme(QIcon.ThemeIcon.ZoomFitBest,
QIcon(":/demos/documentviewer/images/zoom-fit-best.png"))
self.reset_zoom_act = QAction(icon, "Reset Zoom", self)
self.reset_zoom_act.setShortcut(QKeySequence
(Qt.KeyboardModifier.ControlModifier | Qt.Key.Key_0))
self.reset_zoom_act.triggered.connect(self.resetZoom)
self.tool_bar.addAction(self.reset_zoom_act)
def supportedMimeTypes(self):
return self.formats
def clear(self):
self.image_label.setPixmap(QPixmap())
self.max_scale_factor = self.min_scale_factor = 1
self.initial_scale_factor = self.scale_factor = 1
def setupImageUi(self):
self.openFile()
def openFile(self):
QGuiApplication.setOverrideCursor(Qt.WaitCursor)
name = self._file.fileName()
reader = QImageReader(name)
orig_image = reader.read()
if orig_image.isNull():
self.statusMessage(f"Cannot read file {name}:\n{reader.errorString()}", "open")
self.disablePrinting()
QGuiApplication.restoreOverrideCursor()
return
self.clear()
if orig_image.colorSpace().isValid():
image = orig_image.convertedToColorSpace(QColorSpace.SRgb)
else:
image = orig_image
device_pixel_ratio = self.image_label.devicePixelRatioF()
self.image_size = QSizeF(image.size()) / device_pixel_ratio
pixmap = QPixmap.fromImage(image)
pixmap.setDevicePixelRatio(device_pixel_ratio)
self.image_label.setPixmap(pixmap)
target_size = self.image_label.parentWidget().size()
if (self.image_size.width() > target_size.width()
or self.image_size.height() > target_size.height()):
self.initial_scale_factor = min(target_size.width() / self.image_size.width(),
target_size.height() / self.image_size.height())
self.max_scale_factor = 3 * self.initial_scale_factor
self.min_scale_factor = self.initial_scale_factor / 3
self.doSetScaleFactor(self.initial_scale_factor)
self.statusMessage(msgOpen(name, orig_image))
QGuiApplication.restoreOverrideCursor()
self.maybeEnablePrinting()
def setScaleFactor(self, scaleFactor):
if not math.isclose(self.scale_factor, scaleFactor):
self.doSetScaleFactor(scaleFactor)
def doSetScaleFactor(self, scaleFactor):
self.scale_factor = scaleFactor
label_size = (self.image_size * self.scale_factor).toSize()
self.image_label.setFixedSize(label_size)
self.enableZoomActions()
def zoomIn(self):
self.setScaleFactor(self.scale_factor * 1.25)
def zoomOut(self):
self.setScaleFactor(self.scale_factor * 0.8)
def resetZoom(self):
self.setScaleFactor(self.initial_scale_factor)
def hasContent(self):
return not self.image_label.pixmap().isNull()
def enableZoomActions(self):
self.reset_zoom_act.setEnabled(not math.isclose(self.scale_factor,
self.initial_scale_factor))
self.zoom_in_act.setEnabled(self.scale_factor < self.max_scale_factor)
self.zoom_out_act.setEnabled(self.scale_factor > self.min_scale_factor)
def printDocument(self, printer):
if not self.hasContent():
return
painter = QPainter(printer)
pixmap = self.image_label.pixmap()
rect = painter.viewport()
size = pixmap.size()
size.scale(rect.size(), Qt.KeepAspectRatio)
painter.setViewport(rect.x(), rect.y(), size.width(), size.height())
painter.setWindow(pixmap.rect())
painter.drawPixmap(0, 0, pixmap)
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