Source code for TermTk.TTkWidgets.TTkModelView.treewidget

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

from TermTk.TTkCore.cfg import TTkCfg
from TermTk.TTkCore.constant import TTkK
from TermTk.TTkCore.string import TTkString
from TermTk.TTkCore.color import TTkColor
from TermTk.TTkWidgets.TTkModelView.treewidgetitem import TTkTreeWidgetItem
from TermTk.TTkAbstract.abstractscrollview import TTkAbstractScrollView
from TermTk.TTkCore.signal import pyTTkSignal, pyTTkSlot

from dataclasses import dataclass

[docs] class TTkTreeWidget(TTkAbstractScrollView): ''' The :py:class:`TTkTreeWidget` class is a convenience class that provides a standard tree widget with a classic item-based interface. This class is based on TTk's Model/View architecture and uses a default model to hold items, each of which is a :py:class:`TTkTreeWidgetItem`. In its simplest form, a tree widget can be constructed in the following way: .. code-block:: python import TermTk as ttk root = ttk.TTk() tree = ttk.TTkTree(parent=root,size=(80,24)) tree.setHeaderLabels(["Column 1", "Column 2", "Column 3"]) top = ttk.TTkTreeWidgetItem(["String A", "String B", "String C"]) tree.addTopLevelItem(top) for i in range(5): child = ttk.TTkTreeWidgetItem(["Child A" + str(i), "Child B" + str(i), "Child C" + str(i)]) top.addChild(child) root.mainloop() Before items can be added to the tree widget, the number of columns must be set with :meth:`setHeaderLabels`. This allows each item to have one label. The tree can have a header that contains a section for each column in the widget. It is easiest to set up the labels for each section by supplying a list of strings with :meth:`setHeaderLabels`. The items in the tree can be sorted by column according to a predefined sort order. If sorting is enabled, the user can sort the items by clicking on a column header. Sorting can be enabled or disabled by calling setSortingEnabled(). The isSortingEnabled() function indicates whether sorting is enabled. ''' itemActivated:pyTTkSignal ''' This signal is emitted when the user activates an item by double-clicking or pressing a special key (e.g., Enter). :param item: the item that was clicked. :type item: :py:class:`TTkTreeWidgetItem` :param col: the item's column that was clicked. :type col: int ''' itemChanged:pyTTkSignal ''' This signal is emitted when the contents of the column in the specified item changes. :param item: the item reported by this signal :type item: :py:class:`TTkTreeWidgetItem` :param col: the item's column :type col: int ''' itemClicked:pyTTkSignal ''' This signal is emitted when the user clicks inside the widget. If no item was clicked, no signal will be emitted. :param item: the item that was clicked. :type item: :py:class:`TTkTreeWidgetItem` :param col: the item's column that was clicked. :type col: int ''' itemDoubleClicked:pyTTkSignal ''' This signal is emitted when the user double clicks inside the widget. If no item was double clicked, no signal will be emitted. :param item: the item that was clicked. :type item: :py:class:`TTkTreeWidgetItem` :param col: the item's column that was clicked. :type col: int ''' itemExpanded:pyTTkSignal ''' This signal is emitted when the specified item is expanded so that all of its children are displayed. :param item: the item reported by this signal :type item: :py:class:`TTkTreeWidgetItem` ''' itemCollapsed:pyTTkSignal ''' This signal is emitted when the specified item is collapsed so that none of its children are displayed. :param item: the item reported by this signal :type item: :py:class:`TTkTreeWidgetItem` ''' classStyle = { 'default': { 'color': TTkColor.RST, 'lineColor': TTkColor.fg("#444444"), 'headerColor': TTkColor.fg("#ffffff")+TTkColor.bg("#444444")+TTkColor.BOLD, 'selectedColor': TTkColor.fg("#ffff88")+TTkColor.bg("#000066")+TTkColor.BOLD, 'separatorColor': TTkColor.fg("#444444")}, 'disabled': { 'color': TTkColor.fg("#888888"), 'lineColor': TTkColor.fg("#888888"), 'headerColor': TTkColor.fg("#888888"), 'selectedColor': TTkColor.fg("#888888"), 'separatorColor': TTkColor.fg("#888888")}, } __slots__ = ( '_rootItem', '_cache', '_header', '_columnsPos', '_selectedId', '_selected', '_separatorSelected', '_sortColumn', '_sortOrder', '_sortingEnabled', # Signals 'itemChanged', 'itemClicked', 'itemDoubleClicked', 'itemExpanded', 'itemCollapsed', 'itemActivated' ) @dataclass(frozen=True) class _Cache: item: TTkTreeWidgetItem level: int data: list widgets: list firstLine: bool def __init__(self, *, header=[], sortingEnabled=True, **kwargs) -> None: # Signals self.itemActivated = pyTTkSignal(TTkTreeWidgetItem, int) self.itemChanged = pyTTkSignal(TTkTreeWidgetItem, int) self.itemClicked = pyTTkSignal(TTkTreeWidgetItem, int) self.itemDoubleClicked = pyTTkSignal(TTkTreeWidgetItem, int) self.itemExpanded = pyTTkSignal(TTkTreeWidgetItem) self.itemCollapsed = pyTTkSignal(TTkTreeWidgetItem) self._selected = None self._selectedId = None self._separatorSelected = None self._header = header self._columnsPos = [] self._cache = [] self._sortingEnabled=sortingEnabled self._sortColumn = -1 self._sortOrder = TTkK.AscendingOrder self._rootItem = TTkTreeWidgetItem(expanded=True) super().__init__(**kwargs) self.setMinimumHeight(1) self.setFocusPolicy(TTkK.ClickFocus) self.clear() self.setPadding(1,0,0,0) self.viewChanged.connect(self._viewChangedHandler) @pyTTkSlot() def _viewChangedHandler(self) -> None: x,y = self.getViewOffsets() self.layout().setOffset(-x,-y) # Overridden function
[docs] def viewFullAreaSize(self) -> tuple[int, int]: w = self._columnsPos[-1]+1 if self._columnsPos else 0 h = self._rootItem.size() # TTkLog.debug(f"{w=} {h=}") return w,h
[docs] def clear(self) -> None: '''clear''' # Remove all the widgets for ri in self._rootItem.children(): ri.setTreeItemParent(None) if self._rootItem: self._rootItem.dataChanged.disconnect(self._refreshCache) self._rootItem = TTkTreeWidgetItem(expanded=True) self._rootItem.dataChanged.connect(self._refreshCache) self.sortItems(self._sortColumn, self._sortOrder) self._refreshCache() self.viewChanged.emit() self.update()
[docs] def addTopLevelItem(self, item:TTkTreeWidgetItem) -> None: '''addTopLevelItem''' self._rootItem.addChild(item) item.setTreeItemParent(self) self._refreshCache() self.viewChanged.emit() self.update()
[docs] def addTopLevelItems(self, items:TTkTreeWidgetItem) -> None: '''addTopLevelItems''' self._rootItem.addChildren(items) self._rootItem.setTreeItemParent(self) #for item in items: # item.setTreeItemParent(self) self._refreshCache() self.viewChanged.emit() self.update()
[docs] def takeTopLevelItem(self, index) -> None: '''takeTopLevelItem''' self._rootItem.takeChild(index) self._refreshCache() self.viewChanged.emit() self.update()
[docs] def topLevelItem(self, index) -> TTkTreeWidgetItem: '''topLevelItem''' return self._rootItem.child(index)
[docs] def indexOfTopLevelItem(self, item:TTkTreeWidgetItem) -> int: '''indexOfTopLevelItem''' return self._rootItem.indexOfChild(item)
[docs] def selectedItems(self) -> list[TTkTreeWidgetItem]: '''selectedItems''' if self._selected: return [self._selected] return None
[docs] def setHeaderLabels(self, labels:str) -> None: '''setHeaderLabels''' self._header = labels # Set 20 as default column size self._columnsPos = [20+x*20 for x in range(len(labels))] self.viewChanged.emit() self.update()
[docs] def isSortingEnabled(self) -> bool: 'isSortingEnabled' return self._sortingEnabled
[docs] def setSortingEnabled(self, enabled) -> None: 'setSortingEnabled' if enabled != self._sortingEnabled: self._sortingEnabled = enabled self.update()
[docs] def sortColumn(self): '''Returns the column used to sort the contents of the widget.''' return self._sortColumn
[docs] def sortItems(self, col:int, order:TTkK.SortOrder) -> None: '''Sorts the items in the widget in the specified order by the values in the given column.''' if not self._sortingEnabled: return self._sortColumn = col self._sortOrder = order self._rootItem.sortChildren(col, order)
[docs] def columnWidth(self, column:int) -> int: '''columnWidth''' if column==0: return self._columnsPos[column] else: return self._columnsPos[column]-self._columnsPos[column-1]-1
[docs] def setColumnWidth(self, column:int, width: int) -> None: '''setColumnWidth''' i = column newSize = ((1+self._columnsPos[i-1]) if i>0 else 0) + width oldSize = self._columnsPos[i] for ii in range(i,len(self._columnsPos)): self._columnsPos[ii] += newSize-oldSize+1 self._alignWidgets() self.viewChanged.emit() self.update()
[docs] def resizeColumnToContents(self, column:int) -> None: '''resizeColumnToContents''' contentSize = max(row.data[column].termWidth() for row in self._cache) self.setColumnWidth(column, contentSize)
def mouseDoubleClickEvent(self, evt) -> bool: x,y = evt.x, evt.y ox, oy = self.getViewOffsets() x += ox # Handle Header Events # Doubleclick resize to the content size if y == 0: for i, c in enumerate(self._columnsPos): if x == c: self.resizeColumnToContents(i) break return True y += oy-1 if 0 <= y < len(self._cache): item = self._cache[y].item if item.childIndicatorPolicy() == TTkK.DontShowIndicatorWhenChildless and item.children() or \ item.childIndicatorPolicy() == TTkK.ShowIndicator: item.setExpanded(not item.isExpanded()) if item.isExpanded(): self.itemExpanded.emit(item) else: self.itemCollapsed.emit(item) if self._selected: self._selected.setSelected(False) self._selectedId = y self._selected = item self._selected.setSelected(True) col = -1 for i, c in enumerate(self._columnsPos): if x < c: col = i break self.itemDoubleClicked.emit(item, col) self.itemActivated.emit(item, col) self.update() return True def focusOutEvent(self) -> None: self._separatorSelected = None def mousePressEvent(self, evt) -> bool: x,y = evt.x, evt.y ox, oy = self.getViewOffsets() x += ox self._separatorSelected = None # Handle Header Events if y == 0: for i, c in enumerate(self._columnsPos): if x == c: # I-th separator selected self._separatorSelected = i self.update() break elif x < c: # I-th header selected order = not self._sortOrder if self._sortColumn == i else TTkK.AscendingOrder self.sortItems(i, order) break return True # Handle Tree/Table Events y += oy-1 if 0 <= y < len(self._cache): item = self._cache[y].item level = self._cache[y].level # check if the expand button is pressed with +-1 tollerance if level*2 <= x < level*2+3 and \ ( item.childIndicatorPolicy() == TTkK.DontShowIndicatorWhenChildless and item.children() or item.childIndicatorPolicy() == TTkK.ShowIndicator ): item.setExpanded(not item.isExpanded()) if item.isExpanded(): self.itemExpanded.emit(item) else: self.itemCollapsed.emit(item) else: if self._selected: self._selected.setSelected(False) self._selectedId = y self._selected = item self._selected.setSelected(True) col = -1 for i, c in enumerate(self._columnsPos): if x < c: col = i break self.itemClicked.emit(item, col) self.update() return True def mouseDragEvent(self, evt) -> bool: # columnPos (Selected = 2) # 0 1 2 3 4 # ----|-------|--------|----------|---| # Mouse (Drag) Pos # ^ # I consider at least 4 char (3+1) as spacing # Min Selected Pos = (Selected+1) * 4 if self._separatorSelected is not None: x,y = evt.x, evt.y ox, oy = self.getViewOffsets() y += oy x += ox ss = self._separatorSelected pos = max((ss+1)*4, x) diff = pos - self._columnsPos[ss] # Align the previous Separators if pushed for i in range(ss): self._columnsPos[i] = min(self._columnsPos[i], pos-(ss-i)*4) # Align all the other Separators relative to the selection for i in range(ss, len(self._columnsPos)): self._columnsPos[i] += diff self._alignWidgets() self.viewChanged.emit() self.update() return True return False def _alignWidgets(self) -> None: for y,c in enumerate(self._cache): if not c.firstLine: continue for i,w in enumerate(c.widgets): if w: _pos = self._columnsPos[i-1]+1 if i else 3 + c.level*2 _width = self._columnsPos[i] - _pos _height = w.height() w.setGeometry(_pos,y,_width,_height) w.show() @pyTTkSlot() def _refreshCache(self) -> None: # I save a representation of the displayed tree in a cache array # to avoid eccessve recursion over the items and # identify quickly the nth displayed line to improve the interaction # # _cache is an array of TTkTreeWidget._Cache: # [ item, level, data=[txtCol1, txtCol2, txtCol3, ... ]] self._cache = [] def _addToCache(_child, _level:int) -> None: _data = [] _widgets = [] _h =_child.height() for _il in range(len(self._header)): _lines = _child.data(_il).split('\n') if _il==0: _data0 = [] for _id in range(_h): # Trying to define an icon to obtain this results on multiline field # ▶ Label # ┊ NewLine 1 # │ NewLine 2 # ╽ if _id == 0: _icon = " "+_child.icon(_il)+" " elif _id == _h-1: _icon = TTkString(" ╽ ", TTkColor.fg("#666666")) elif _id == 1: _icon = TTkString(" ┊ ", TTkColor.fg("#666666")) else: _icon = TTkString(" │ ", TTkColor.fg("#666666")) _text = _lines[_id] if _id<len(_lines) else "" _data0.append(' '*_level+_icon+_text) _data.append(_data0) _widgets.append(_child.widget(_il)) else: _data.append([TTkString(s) for s in _lines]+[TTkString()]*(_h-len(_lines))) _widgets.append(_child.widget(_il)) for _id in range(_h): self._cache.append(TTkTreeWidget._Cache( item = _child, level = _level, data = [ dt[_id] for dt in _data], widgets = _widgets, firstLine=_id==0)) if _child.isExpanded(): for _c in _child.children(): _addToCache(_c, _level+1) for c in self._rootItem.children(): _addToCache(c,0) self._alignWidgets() self.update() self.viewChanged.emit() def paintEvent(self, canvas) -> None: style = self.currentStyle() color= style['color'] lineColor= style['lineColor'] headerColor= style['headerColor'] selectedColor= style['selectedColor'] separatorColor= style['separatorColor'] x,y = self.getViewOffsets() w,h = self.size() tt = TTkCfg.theme.tree # Draw header first: for i,l in enumerate(self._header): hx = 0 if i==0 else self._columnsPos[i-1]+1 hx1 = self._columnsPos[i] canvas.drawText(pos=(hx-x,0), text=l, width=hx1-hx, color=headerColor) if self._sortingEnabled and i == self._sortColumn: s = tt[6] if self._sortOrder == TTkK.AscendingOrder else tt[7] canvas.drawText(pos=(hx1-x-1,0), text=s, color=headerColor) # Draw header separators for sx in self._columnsPos: canvas.drawChar(pos=(sx-x,0), char=tt[5], color=headerColor) for sy in range(1,h): canvas.drawChar(pos=(sx-x,sy), char=tt[4], color=lineColor) # Draw cache for i, c in enumerate(self._cache): if i-y<0: continue item = c.item for il in range(len(self._header)): lx = 0 if il==0 else self._columnsPos[il-1]+1 lx1 = self._columnsPos[il] text = c.data[il] if item.isSelected(): canvas.drawText(pos=(lx-x,i-y+1), text=text.completeColor(selectedColor), width=lx1-lx, alignment=item.textAlignment(il), color=selectedColor) else: canvas.drawText(pos=(lx-x,i-y+1), text=text, width=lx1-lx, alignment=item.textAlignment(il))