| from os import path |
| from PIL import Image |
| from urllib.parse import urlparse, unquote |
| from PyQt5 import QtCore |
| from PyQt5.QtCore import Qt |
| from PyQt5.QtWidgets import ( |
| QApplication, |
| QMainWindow, |
| QHBoxLayout, |
| QVBoxLayout, |
| QGridLayout, |
| QPushButton, |
| QRadioButton, |
| QButtonGroup, |
| QSlider, |
| QLabel, |
| QFrame, |
| QComboBox, |
| QCheckBox, |
| QWidget, |
| QSizePolicy, |
| QMessageBox, |
| ) |
| from PyQt5.QtCore import QSize |
| from PyQt5.QtGui import QPixmap, QDesktopServices, QDragEnterEvent, QDropEvent |
|
|
|
|
| class LabeledSlider(QWidget): |
| """A simple QSlider and QLabel combo for displaying the slider value; |
| it holds both an _int_ and _float_ representation of the slider value |
| for convenience, the value to display is determined by the |
| _use_float_value_ initialization argument. |
| """ |
|
|
| valueChanged = QtCore.pyqtSignal(int, float) |
|
|
| def __init__(self, use_float_value=False): |
| super().__init__() |
| self.use_float_value = use_float_value |
| self._label = QLabel("0") |
| if use_float_value: |
| self._label.setText("0.00") |
| self._slider = QSlider(orientation=Qt.Orientation.Horizontal) |
| self._slider.setMaximum(20) |
| self._slider.setMinimum(0) |
| self._slider.setValue(0) |
| self._slider.setTickInterval(1) |
| self._slider.setSingleStep(1) |
| self._slider.valueChanged.connect(self.onSliderChanged) |
| hlayout = QHBoxLayout() |
| hlayout.addWidget(self._slider) |
| hlayout.addWidget(self._label) |
| self.setLayout(hlayout) |
|
|
| def onSliderChanged(self, value): |
| if self.use_float_value: |
| self._label.setText("%.2f" % (value / 20.0)) |
| else: |
| self._label.setText("%d" % (value)) |
| self.valueChanged.emit(value, value / 20.0) |
|
|
| def setValue(self, value): |
| if self.use_float_value: |
| self._slider.setValue(int(value * 20)) |
| else: |
| self._slider.setValue(value) |
|
|
| def getValue(self): |
| if self.use_float_value: |
| return self._slider.value() / 20.0 |
| else: |
| return self._slider.value() |
|
|
|
|
| class ImageLabel(QLabel): |
| """A simple QLabel widget for displaying an image; the label image |
| can be updated either by calling the _show_image()_ method or by |
| dragging an image into the widget area if the label is set to |
| accept drag and drop, which is set to _False_ by default. |
| """ |
|
|
| changed = QtCore.pyqtSignal() |
|
|
| def __init__(self, text: str, width=512, height=512): |
| super().__init__(text) |
| self.setAlignment(Qt.AlignCenter) |
| self.resize(width, height) |
| self.setSizePolicy(QSizePolicy.MinimumExpanding, QSizePolicy.MinimumExpanding) |
| self.sizeHint = QSize(width, height) |
| self.width = width |
| self.height = height |
| self.setAcceptDrops(False) |
|
|
| def show_image(self, pixmap: QPixmap = None): |
| """Updates the widget pixamp""" |
| if pixmap == None or pixmap.isNull(): |
| return |
| self.current_pixmap = pixmap |
| self.changed.emit() |
|
|
| |
| image_width = self.current_pixmap.width() |
| image_height = self.current_pixmap.height() |
| if image_width > self.width or image_height > self.height: |
| new_width = self.width if image_width > self.width else image_width |
| new_height = self.height if image_height > self.height else image_height |
| self.setPixmap( |
| self.current_pixmap.scaled( |
| new_width, |
| new_height, |
| Qt.KeepAspectRatio, |
| ) |
| ) |
| else: |
| self.setPixmap(self.current_pixmap) |
|
|
| def dragEnterEvent(self, event: QDragEnterEvent): |
| if event.mimeData().hasFormat("text/plain"): |
| event.acceptProposedAction() |
|
|
| def dropEvent(self, event: QDropEvent): |
| event.acceptProposedAction() |
| self.path = unquote(urlparse(event.mimeData().text()).path) |
| pixmap = QPixmap(self.path) |
| self.show_image(pixmap) |
| self.update() |
|
|
|
|
| |
| if __name__ == "__main__": |
| import sys |
|
|
| app = QApplication(sys.argv) |
| window = QMainWindow() |
| window.resize(640, 480) |
| window.layout().addWidget(LabeledSlider(True)) |
| window.layout().addWidget(ImageLabel("Hello world!", 128, 128)) |
| window.show() |
| app.exec() |
|
|
