Source code for TermTk.TTkAbstract.abstractscrollview

# MIT License
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# Copyright (c) 2021 Eugenio Parodi <ceccopierangiolieugenio AT googlemail DOT com>
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__all__ = ['TTkAbstractScrollViewInterface', 'TTkAbstractScrollView', 'TTkAbstractScrollViewGridLayout']

from TermTk.TTkCore.constant import TTkK
from TermTk.TTkCore.cfg import TTkCfg
from TermTk.TTkCore.signal import pyTTkSlot, pyTTkSignal
from TermTk.TTkWidgets.container import TTkContainer
from TermTk.TTkLayouts.layout import TTkLayout
from TermTk.TTkLayouts.gridlayout import TTkGridLayout

[docs] class TTkAbstractScrollViewInterface(): ''' The :py:class:`TTkAbstractScrollViewInterface` provide the basic interface that can be used in :py:class:`TTkAbstractScrollArea` to enable on-demand scroll bars. When subclassing :py:class:`TTkAbstractScrollViewInterface`, you must implement :meth:`viewFullAreaSize`, :meth:`viewDisplayedSize`, :meth:`getViewOffsets`, and :meth:`viewMoveTo`. This interface is implemented in the following specialised classes: * :py:class:`TTkAbstractScrollView` * :py:class:`TTkAbstractScrollViewLayout` * :py:class:`TTkAbstractScrollViewGridLayout` ''' def __init__(self) -> None: pass # Override this function
[docs] def viewFullAreaSize(self) -> (int, int): ''' This method returns the full widget area size of the :py:class:`TTkAbstractScrollViewInterface` implementation. This is required to `TTkAbstractScrollArea` implementation to handle the on-demand scroll bars. .. note:: Reimplement this function to handle this event :return: the full area size as a tuple of 2 int elements (width,height) :rtype: tuple[int,int] ''' raise NotImplementedError()
# Override this function
[docs] def viewDisplayedSize(self) -> (int, int): ''' This method returns the displayed size of the :py:class:`TTkAbstractScrollViewInterface` implementation. .. note:: Reimplement this function to handle this event This method is already implemented in the following classes: * :py:class:`TTkAbstractScrollView` * :py:class:`TTkAbstractScrollViewLayout` * :py:class:`TTkAbstractScrollViewGridLayout` Unless a different iplementation is required, by default it should return :py:meth:`TTkWidget.size` :return: the displayed size as a tuple of 2 int elements (width,height) :rtype: tuple[int,int] ''' raise NotImplementedError()
[docs] @pyTTkSlot(int, int) def viewMoveTo(self, x: int, y: int): ''' This method is used to set the vertical and horizontal offsets of the :py:class:`TTkAbstractScrollViewInterface` .. note:: Reimplement this function to handle this event This method is already implemented in the following classes: * :py:class:`TTkAbstractScrollView` * :py:class:`TTkAbstractScrollViewLayout` * :py:class:`TTkAbstractScrollViewGridLayout` :param x: the horizontal position :type x: int :param y: the vertical position :type y: int ''' raise NotImplementedError()
[docs] def getViewOffsets(self) -> tuple: ''' Retrieve the vertical and horizontal offsets of the :py:class:`TTkAbstractScrollViewInterface` .. note:: Reimplement this function to handle this event This method is already implemented in the following classes: * :py:class:`TTkAbstractScrollView` * :py:class:`TTkAbstractScrollViewLayout` * :py:class:`TTkAbstractScrollViewGridLayout` :return: the (x,y) offset :rtype: tuple[int,int] ''' return self._viewOffsetX, self._viewOffsetY
[docs] class TTkAbstractScrollView(TTkContainer, TTkAbstractScrollViewInterface): ''' The :py:class:`TTkAbstractScrollView` is a :py:class:`TTkContainer` widget that incude :py:class:`TTkAbstractScrollViewInterface` api. The placement of any widget inside this container will change accordingly to the offset of this view. This class is used in the convenience widget :py:class:`TTkScrollArea` ''' viewMovedTo:pyTTkSignal ''' This signal is emitted when the view content move to a new position (x,y), :param x: the new horizontal offset :type x: int :param y: the new vertical offset :type y: int ''' viewSizeChanged:pyTTkSignal ''' This signal is emitted when the view content size changed :param width: the new width :type width: int :param height: the new heighht :type height: int ''' viewChanged:pyTTkSignal ''' This signal is emitted whenever there is a change in the view content topology (size,pos) .. note:: This signal must be implemented in any implementation of :py:class:`TTkAbstractScrollView` to notify that the view content boudaries changed ''' __slots__ = ( '_viewOffsetX', '_viewOffsetY', # Signals 'viewMovedTo', 'viewSizeChanged', 'viewChanged') def __init__(self, **kwargs) -> None: # Signals self.viewMovedTo = pyTTkSignal(int, int) # x, y self.viewSizeChanged = pyTTkSignal(int, int) # w, h self.viewChanged = pyTTkSignal() self._viewOffsetX = 0 self._viewOffsetY = 0 # Do NOT use super() TTkContainer.__init__(self, **kwargs)
[docs] def viewDisplayedSize(self) -> (int, int): return self.size()
[docs] @pyTTkSlot(int, int) def viewMoveTo(self, x: int, y: int): fw, fh = self.viewFullAreaSize() dw, dh = self.viewDisplayedSize() rangex = fw - dw rangey = fh - dh # TTkLog.debug(f"x:{x},y:{y}, full:{fw,fh}, display:{dw,dh}, range:{rangex,rangey}") x = max(0,min(rangex,x)) y = max(0,min(rangey,y)) # TTkLog.debug(f"x:{x},y:{y}, wo:{self._viewOffsetX,self._viewOffsetY}") if self._viewOffsetX == x and \ self._viewOffsetY == y: # Nothong to do return self._viewOffsetX = x self._viewOffsetY = y self.viewMovedTo.emit(x,y) self.viewChanged.emit() self.update()
[docs] def getViewOffsets(self) -> tuple: return self._viewOffsetX, self._viewOffsetY
def wheelEvent(self, evt): delta = TTkCfg.scrollDelta offx, offy = self.getViewOffsets() if evt.evt == TTkK.WHEEL_Up: delta = -delta self.viewMoveTo(offx, offy + delta) return True def resizeEvent(self, w, h): self.viewMoveTo(self._viewOffsetX, self._viewOffsetY) self.viewSizeChanged.emit(w,h) self.viewChanged.emit() def update(self, repaint=True, updateLayout=False, updateParent=False): if updateLayout: self.viewChanged.emit() return super().update(repaint, updateLayout, updateParent)
class TTkAbstractScrollViewLayout(TTkLayout, TTkAbstractScrollViewInterface): ''' :py:class:`TTkAbstractScrollViewLayout` ''' viewMovedTo:pyTTkSignal ''' This signal is emitted when the view content move to a new position (x,y), :param x: the new horizontal offset :type x: int :param y: the new vertical offset :type y: int ''' viewSizeChanged:pyTTkSignal ''' This signal is emitted when the view content size changed :param width: the new width :type width: int :param height: the new heighht :type height: int ''' viewChanged:pyTTkSignal ''' This signal is emitted whenever there is a change in the view content topology (size,pos) .. note:: This signal must be implemented in any implementation of :py:class:`TTkAbstractScrollView` to notify that the view content boudaries changed ''' __slots__ = ( '_viewOffsetX', '_viewOffsetY', # Signals 'viewMovedTo', 'viewSizeChanged', 'viewChanged', '_excludeEvent') def __init__(self, *args, **kwargs) -> None: # Signals self.viewMovedTo = pyTTkSignal(int, int) # x, y self.viewSizeChanged = pyTTkSignal(int, int) # w, h self.viewChanged = pyTTkSignal() self._viewOffsetX = 0 self._viewOffsetY = 0 self._excludeEvent = False TTkLayout.__init__(self, *args, **kwargs) def viewFullAreaSize(self) -> (int, int): _,_,w,h = self.fullWidgetAreaGeometry() return w,h def viewDisplayedSize(self) -> (int, int): _,_,w,h = self.geometry() return w,h @pyTTkSlot(int, int) def viewMoveTo(self, x: int, y: int): self.setOffset(-x,-y) def getViewOffsets(self) -> tuple: return self._viewOffsetX, self._viewOffsetY def setGeometry(self, x, y, w, h): TTkLayout.setGeometry(self, x, y, w, h) self.viewChanged.emit()
[docs] class TTkAbstractScrollViewGridLayout(TTkGridLayout, TTkAbstractScrollViewInterface): ''' :py:class:`TTkAbstractScrollViewGridLayout` ''' viewMovedTo:pyTTkSignal ''' This signal is emitted when the view content move to a new position (x,y), :param x: the new horizontal offset :type x: int :param y: the new vertical offset :type y: int ''' viewSizeChanged:pyTTkSignal ''' This signal is emitted when the view content size changed :param width: the new width :type width: int :param height: the new heighht :type height: int ''' viewChanged:pyTTkSignal ''' This signal is emitted whenever there is a change in the view content topology (size,pos) .. note:: This signal is normally emitted from any implementation of :py:class:`TTkAbstractScrollView` to notify that the view content boudaries changed ''' __slots__ = ( '_viewOffsetX', '_viewOffsetY', '_excludeEvent', # Signals 'viewMovedTo', 'viewSizeChanged', 'viewChanged') def __init__(self, *args, **kwargs) -> None: # Signals self.viewMovedTo = pyTTkSignal(int, int) # x, y self.viewSizeChanged = pyTTkSignal(int, int) # w, h self.viewChanged = pyTTkSignal() self._viewOffsetX = 0 self._viewOffsetY = 0 self._excludeEvent = False TTkGridLayout.__init__(self, *args, **kwargs)
[docs] @pyTTkSlot(int, int) def viewMoveTo(self, x: int, y: int): fw, fh = self.viewFullAreaSize() dw, dh = self.viewDisplayedSize() rangex = fw - dw rangey = fh - dh # TTkLog.debug(f"x:{x},y:{y}, full:{fw,fh}, display:{dw,dh}, range:{rangex,rangey}") x = max(0,min(rangex,x)) y = max(0,min(rangey,y)) # TTkLog.debug(f"x:{x},y:{y}, wo:{self._viewOffsetX,self._viewOffsetY}") if self._viewOffsetX == x and \ self._viewOffsetY == y: # Nothong to do return self._excludeEvent = True for widget in self.iterWidgets(recurse=False): widget.viewMoveTo(x,y) self._excludeEvent = False self._viewOffsetX = x self._viewOffsetY = y self.viewMovedTo.emit(x,y) self.viewChanged.emit() self.update()
[docs] def getViewOffsets(self) -> tuple: return self._viewOffsetX, self._viewOffsetY
def setGeometry(self, x, y, w, h): TTkGridLayout.setGeometry(self, x, y, w, h) self.viewChanged.emit() @pyTTkSlot() def _viewChanged(self): if self._excludeEvent: return self.viewChanged.emit() @pyTTkSlot(int,int) def _viewMovedTo(self, x, y): if self._excludeEvent: return self.viewMoveTo(x, y) def addWidget(self, widget, row=None, col=None, rowspan=1, colspan=1): if not issubclass(type(widget),TTkAbstractScrollViewInterface): raise TypeError("TTkAbstractScrollViewInterface is required in TTkAbstractScrollViewGridLayout.addWidget(...)") widget.viewChanged.connect(self._viewChanged) widget.viewMovedTo.connect(self._viewMovedTo) return TTkGridLayout.addWidget(self, widget, row, col, rowspan, colspan) def addItem(self, item, row=None, col=None, rowspan=1, colspan=1): if not issubclass(type(item),TTkAbstractScrollViewInterface): raise TypeError("TTkAbstractScrollViewInterface is required in TTkAbstractScrollViewGridLayout.addItem(...)") return TTkGridLayout.addItem(self, item, row, col, rowspan, colspan) # Override this function
[docs] def viewFullAreaSize(self) -> (int, int): w,h=0,0 for widget in self.iterWidgets(recurse=False): ww,wh = widget.viewFullAreaSize() w = max(w,ww) h = max(h,wh) return w,h
# Override this function
[docs] def viewDisplayedSize(self) -> (int, int): w,h=0,0 for widget in self.iterWidgets(recurse=False): ww,wh = widget.viewDisplayedSize() w = max(w,ww) h = max(h,wh) return w,h