Source code for TermTk.TTkWidgets.slider

# MIT License
#
# Copyright (c) 2024 Eugenio Parodi <ceccopierangiolieugenio AT googlemail DOT com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
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# The above copyright notice and this permission notice shall be included in all
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#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# SOFTWARE.

__all__ = ['TTkSlider']

from TermTk.TTkCore.log import TTkLog
from TermTk.TTkCore.constant import TTkK
from TermTk.TTkCore.canvas import TTkCanvas
from TermTk.TTkCore.string import TTkString
from TermTk.TTkCore.signal import pyTTkSlot, pyTTkSignal
from TermTk.TTkCore.color import TTkColor
from TermTk.TTkWidgets.scrollbar import TTkScrollBar

'''
    ref: https://doc.qt.io/qt-5/qslider.html
'''
[docs] class TTkSlider(TTkScrollBar): '''TtkSlider''' classStyle = { 'default': { 'color': TTkColor.RST, 'sliderColor': TTkColor.fg('#6666bb')}, 'disabled': { 'color': TTkColor.fg('#666666'), 'sliderColor': TTkColor.fg('#888888')}, 'focus': { 'color': TTkColor.fg('#cccc00'), 'sliderColor': TTkColor.fg('#8888ff')}, } def wheelEvent(self, evt): if self._orientation == TTkK.VERTICAL: if evt.evt == TTkK.WHEEL_Up: value = self._value+self._pageStep else: value = self._value-self._pageStep else: if evt.evt == TTkK.WHEEL_Up: value = self._value-self._pageStep else: value = self._value+self._pageStep self.setValue(max(self._minimum,min(self._maximum,value))) self.sliderMoved.emit(self._value) return True def mousePressEvent(self, evt): if self._orientation == TTkK.VERTICAL: size=self._height-1 mouse = max(0,min(size,size-evt.y)) else: size=self._width-1 mouse = max(0,min(size,evt.x)) self._draggable = False if self._maximum > self._minimum: smin = self._minimum smax = self._maximum sval = self._value sliderPos = int(0.5+size*(sval-smin)/(smax-smin)) if mouse < sliderPos: self.setValue(self._value - self._pageStep) elif mouse > sliderPos: self.setValue(self._value + self._pageStep) else: self._draggable = True self.sliderMoved.emit(self._value) return True def mouseDragEvent(self, evt): if not self._draggable: return False if self._orientation == TTkK.VERTICAL: size=self._height-1 mouse = max(0,min(size,size-evt.y)) else: size=self._width-1 mouse = max(0,min(size,evt.x)) if self._maximum > self._minimum: smin = self._minimum smax = self._maximum val = int(0.5+smin+(smax-smin)*mouse/size) if val != self._value: self.setValue(val) self.sliderMoved.emit(self._value) return True ''' ╞═══════════╬═════╡ ''' def paintEvent(self, canvas:TTkCanvas): style = self.currentStyle() color = style['color'] sliderColor = style['sliderColor'] if self._orientation == TTkK.VERTICAL: size=self._height-1 else: size=self._width-1 if self._maximum > self._minimum: smin = self._minimum smax = self._maximum sval = self._value sliderPos = int(0.5+size*(sval-smin)/(smax-smin)) else: # Special case where no scroll is needed sliderPos = size//2 if self._orientation == TTkK.VERTICAL: canvas.drawChar(pos=(0,0),char='┬',color=color) for y in range(1,size-sliderPos): canvas.drawChar(pos=(0,y),char='┊',color=color) if sliderPos>0: canvas.drawChar(pos=(0,size-sliderPos),char='╦',color=sliderColor) for y in range(size-sliderPos+1,size): canvas.drawChar(pos=(0,y),char='║',color=sliderColor) canvas.drawChar(pos=(0,size),char='╨',color=sliderColor) else: canvas.drawTTkString(pos=(0,size),text=TTkString(f"╧",sliderColor)) else: canvas.drawTTkString(pos=(0,0),text=TTkString(f"{'┄'*(size)}┤",color)) if sliderPos>0: canvas.drawTTkString(pos=(0,0),text=TTkString(f"╞{'═'*(sliderPos-1)}╣",sliderColor)) else: canvas.drawTTkString(pos=(0,0),text=TTkString(f"║",sliderColor))