59 lines
1.9 KiB
Python
59 lines
1.9 KiB
Python
"""
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This module contains a widget that can show the html preview of an
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editor.
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"""
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from weakref import proxy
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from pyqode.qt import QtCore, QtWidgets
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from pyqode.core.api import DelayJobRunner
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class HtmlPreviewWidget(QtWidgets.QTextEdit):
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"""
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Display html preview of a document as rich text in a QTextEdit.
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"""
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hide_requested = QtCore.Signal()
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show_requested = QtCore.Signal()
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def __init__(self, parent=None):
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super(HtmlPreviewWidget, self).__init__(parent)
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self._editor = None
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self._timer = DelayJobRunner(delay=1000)
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def set_editor(self, editor):
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try:
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self.setHtml(editor.to_html())
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except (TypeError, AttributeError):
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self.setHtml('<center>No preview available...</center>')
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self._editor = None
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self.hide_requested.emit()
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else:
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if self._editor is not None and editor != self._editor:
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try:
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self._editor.textChanged.disconnect(self._on_text_changed)
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except TypeError:
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pass
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editor.textChanged.connect(self._on_text_changed)
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self._editor = proxy(editor)
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self.show_requested.emit()
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def _on_text_changed(self, *_):
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self._timer.request_job(self._update_preview)
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def _update_preview(self):
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try:
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# remember cursor/scrollbar position
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p = self.textCursor().position()
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v = self.verticalScrollBar().value()
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# display new html
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self.setHtml(self._editor.to_html())
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# restore cursor/scrollbar position
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c = self.textCursor()
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c.setPosition(p)
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self.setTextCursor(c)
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self.verticalScrollBar().setValue(v)
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except (TypeError, AttributeError):
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self.setHtml('<center>No preview available...</center>')
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self.hide_requested.emit()
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