ykcheungab
72 lines
2.3 KiB
Python
72 lines
2.3 KiB
Python
"""Square 1:1 image panel host for dashboard viewports."""
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from __future__ import annotations
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from PyQt5.QtCore import Qt
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from PyQt5.QtGui import QPixmap
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from PyQt5.QtWidgets import QLabel, QSizePolicy, QVBoxLayout, QWidget
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from gui.widgets.qt_pixmap import pixmap_keep_aspect
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class ImagePanel(QWidget):
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"""Fixed square widget that displays an image at 1:1 aspect ratio."""
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def __init__(
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self,
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*,
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title: str = "",
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object_name: str = "panelLabel",
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default_side: int = 256,
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min_side: int = 64,
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parent=None,
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):
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super().__init__(parent)
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self._side = default_side
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self._min_side = min_side
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self._source_pixmap: QPixmap | None = None
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self.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)
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layout = QVBoxLayout(self)
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layout.setContentsMargins(0, 0, 0, 0)
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self.label = QLabel(title)
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self.label.setObjectName(object_name)
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self.label.setAlignment(Qt.AlignCenter)
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layout.addWidget(self.label)
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self.set_side_length(self._side)
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def set_side_length(self, side: int) -> None:
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self.set_fixed_size(side, side)
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def set_fixed_size(self, width: int, height: int) -> None:
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width = max(int(width), self._min_side)
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height = max(int(height), self._min_side)
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if width == self.width() and height == self.height() and width == self._side:
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return
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self._side = width
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self.setFixedSize(width, height)
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self.label.setFixedSize(width, height)
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self.on_side_length_changed(min(width, height))
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self._refresh_pixmap()
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@property
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def side_length(self) -> int:
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return self._side
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def on_side_length_changed(self, side: int) -> None:
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"""Hook for subclasses (e.g. resize an offscreen renderer)."""
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def set_source_pixmap(self, pixmap: QPixmap | None) -> None:
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self._source_pixmap = pixmap
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self._refresh_pixmap()
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def _refresh_pixmap(self) -> None:
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if self._source_pixmap is None or self._source_pixmap.isNull():
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return
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self.label.setPixmap(pixmap_keep_aspect(self._source_pixmap, self.label.size()))
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def resizeEvent(self, event):
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super().resizeEvent(event)
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self._refresh_pixmap()
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