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"""
This module contains the PromptLineEdit widget implementation.
"""
import os
from pyqode.core import icons
from pyqode.qt import QtWidgets, QtCore, QtGui
from pyqode.qt import PYQT5_API
from pyqode.qt import PYQT4_API
from pyqode.qt import PYSIDE_API
class PromptLineEdit(QtWidgets.QLineEdit):
"""
Extends QLineEdit to show a prompt text and a clear icon
"""
#: Signal emitted when the embedded button is clicked
clear_clicked = QtCore.Signal()
def __init__(self, parent=None,
prompt_text=_(' Search'), button_icon=None):
super(PromptLineEdit, self).__init__(parent)
self._margin = self.sizeHint().height() - 2
self._spacing = 0
self._prompt_text = prompt_text
self.button = QtWidgets.QToolButton(self)
if button_icon is None:
button_icon = icons.icon(
'edit-clear', ':/pyqode-icons/rc/clear-left.png',
'fa.times-circle')
self.button.setIcon(button_icon)
self.button.setToolTip(_("Clear"))
self.button.setStyleSheet(
"QToolButton { border: none; padding: 5px; }")
self.button.setCursor(QtCore.Qt.ArrowCursor)
self.button.setFocusPolicy(QtCore.Qt.NoFocus)
self.set_button_visible(False)
self.textChanged.connect(self._on_text_changed)
self.button.clicked.connect(self.clear)
self.button.clicked.connect(self.clear_clicked.emit)
@property
def prompt_text(self):
"""
Gets/Sets the prompt text.
"""
return self._prompt_text
@prompt_text.setter
def prompt_text(self, prompt):
self._prompt_text = prompt
self.update()
def paintEvent(self, event):
super(PromptLineEdit, self).paintEvent(event)
qt_api = os.environ['QT_API'].lower()
if self._prompt_text and not self.text() and self.isEnabled():
if qt_api in PYQT4_API:
from PyQt4.QtGui import QStyleOptionFrameV3
option = QStyleOptionFrameV3()
elif qt_api in PYSIDE_API:
from PySide.QtGui import QStyleOptionFrameV3
option = QStyleOptionFrameV3()
elif qt_api in PYQT5_API:
from PyQt5.QtWidgets import QStyleOptionFrame
option = QStyleOptionFrame()
else:
msg = 'Qt bindings "%s" is not supported' % qt_api
raise PythonQtError(msg)
self.initStyleOption(option)
left, top, right, bottom = self.getTextMargins()
va = self.style().visualAlignment(
self.layoutDirection(), self.alignment())
rect = self.style().subElementRect(
QtWidgets.QStyle.SE_LineEditContents, option, self).adjusted(
2, 0, 0, 0).adjusted(left, top, -right, -bottom)
fm = QtGui.QFontMetrics(self.font())
text = fm.elidedText(
self._prompt_text, QtCore.Qt.ElideRight, rect.width())
painter = QtGui.QPainter(self)
painter.setPen(self.palette().color(
QtGui.QPalette.Disabled, QtGui.QPalette.Text))
painter.drawText(rect, va, text)
def resizeEvent(self, event):
# Adjusts Clear button position
super(PromptLineEdit, self).resizeEvent(event)
self.button.resize(QtCore.QSize(self._margin, self.height() - 2))
self.button.move(self.width() - self._margin - 3, 0)
def set_button_visible(self, visible):
"""
Sets the clear button as ``visible``
:param visible: Visible state (True = visible, False = hidden).
"""
self.button.setVisible(visible)
left, top, right, bottom = self.getTextMargins()
if visible:
right = self._margin + self._spacing
else:
right = 0
self.setTextMargins(left, top, right, bottom)
def _on_text_changed(self, text):
"""Text changed, update Clear button visibility
"""
self.set_button_visible(len(text) > 0)
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