TTkTreeWidget

class TTkTreeWidget(*, header: List[TTkString] = [], sortingEnabled: bool = True, selectionMode: SelectionMode = SelectionMode.SingleSelection, dragDropMode: DragDropMode = DragDropMode.NoDragDrop, **kwargs)

Bases: TTkAbstractScrollView

The 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 TTkTreeWidgetItem.

In its simplest form, a tree widget can be constructed in the following way:

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 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 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.

Parameters:

• header (List[TTkString], optional) – define the header labels of each column, defaults to []

• sortingEnabled (bool, optional) – enable the column sorting, defaults to False

• selectionMode (TTkK.SelectionMode, optional) – This property controls whether the user can select one or many items, defaults to TTkK.SelectionMode.SingleSelection.

• dragDropMode (TTkK.DragDropMode, optional) – This property holds the drag and drop event the view will act upon, defaults to TTkK.DragDropMode.NoDragDrop.

TTkContainer’s inherited init params:

Parameters:

• layout (TermTk.TTkLayouts) – the layout of this widget, optional, defaults to TTkLayout

• padding (TTkPadding) – the padding (top, bottom, left, right) of the widget, defaults to (0,0,0,0)

• paddingTop (int) – the Top padding, override Top padding if already defined, optional, default=0 if padding is not defined

• paddingBottom (int) – the Bottom padding, override Bottom padding if already defined, optional, default=0 if padding is not defined

• paddingLeft (int) – the Left padding, override Left padding if already defined, optional, default=0 if padding is not defined

• paddingRight (int) – the Right padding, override Right padding if already defined, optional, default=0 if padding is not defined

• forwardStyle (bool) – [Experimental] any change of style will reflect the children, defaults to False

TTkWidget’s inherited init params:

Parameters:

• name (str, optional) – the name of the widget, defaults to “”

• parent (TTkWidget, optional) – the parent widget, defaults to None

• x (int, optional) – the x position, defaults to 0

• y (int, optional) – the y position, defaults to 0

• pos ((int,int), optional) – the [x,y] position (override the previously defined x, y), defaults to (x,y)

• width (int, optional) – the width of the widget, defaults to 0

• height (int, optional) – the height of the widget, defaults to 0

• size ((int,int), optional) – the size [width, height] of the widget (override the previously defined sizes), defaults to (width,height)

• maxWidth (int, optional) – the maxWidth of the widget, defaults to 0x10000

• maxHeight (int, optional) – the maxHeight of the widget, defaults to 0x10000

• maxSize ((int,int), optional) – the max [width,height] of the widget, optional, defaults to (maxWidth,maxHeight)

• minWidth (int, optional) – the minWidth of the widget, defaults to 0

• minHeight (int, optional) – the minHeight of the widget, defaults to 0

• minSize ((int,int), optional) – the minSize [width,height] of the widget, optional, defaults to (minWidth,minHeight)

• toolTip (TTkString, optional) – This property holds the widget’s tooltip, defaults to ‘’

• style (dict, optional) – this field hold the custom style to be used by this widget

• addStyle (dict, optional) – this field is required to override/merge the new style on top of the current one, useful if only few params need to be changed

• visible (bool, optional) – the visibility, optional, defaults to True

• enabled (bool, optional) – the ability to handle input events, optional, defaults to True

TMouseEvents’s inherited init params:

Initialize self. See help(type(self)) for accurate signature.

TDragEvents’s inherited init params:

Initialize self. See help(type(self)) for accurate signature.

Style

classStyle = {
            'default':     {
                'color': TTkColor.RST,
                'lineColor': TTkColor.fg("#444444"),
                'lineHeightColor': TTkColor.fg("#666666"),
                '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"),
                'lineHeightColor': TTkColor.fg("#666666"),
                'headerColor': TTkColor.fg("#888888"),
                'selectedColor': TTkColor.fg("#888888"),
                'separatorColor': TTkColor.fg("#888888")},
        }

Signals

closed	This signal is emitted whenever the widget is closed
currentStyleChanged	This signal is emitted whenever the widget stye change
focusChanged	This signal is emitted whenever the focus status change i.e. with the setFocus() or clearFocus() methods.
sizeChanged	This signal is emitted whenever the widget size change
viewChanged	This signal is emitted whenever there is a change in the view content topology (size,pos)
viewMovedTo	This signal is emitted when the view content move to a new position (x,y),
viewSizeChanged	This signal is emitted when the view content size changed

Slots

collapseAll()	Collapse all collapsable items.
expandAll()	Expands all expandable items.

Slots Inherited from: TTkAbstractScrollView

viewMoveTo(x, y)

This method is used to set the vertical and horizontal offsets of the TTkAbstractScrollViewInterface

Slots Inherited from: TTkContainer

hide()	hide the widget
show()	show the widget

Slots Inherited from: TTkWidget

close()	Close (Destroy/Remove) the widget
hide()	hide the widget
lowerWidget()	Lower the Widget below its relatives
raiseWidget([raiseParent])	Raise the Widget above its relatives
setDisabled([disabled])	This property holds whether the widget is disnabled
setEnabled([enabled])	This property holds whether the widget is enabled
setFocus()	Focus the widget
setVisible(visible)	Set the visibility status of this widget
show()	show the widget
update([repaint, updateLayout, updateParent])	Notify the drawing routine that the widget changed and needs to draw its new content.

Members

closed: pyTTkSignal

This signal is emitted whenever the widget is closed

Parameters:

widget (TTkWidget) – the widget closed (=self)

currentStyleChanged: pyTTkSignal

This signal is emitted whenever the widget stye change

Parameters:

style (dict) – the new style applied

focusChanged: pyTTkSignal

This signal is emitted whenever the focus status change i.e. with the setFocus() or clearFocus() methods

Parameters:

status (bool) – the curent focus status

sizeChanged: pyTTkSignal

This signal is emitted whenever the widget size change

Parameters:

• width (int) – the new widget width

• height (int) – the new widget height

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 TTkAbstractScrollView to notify that the view content boudaries changed

viewMovedTo: pyTTkSignal

This signal is emitted when the view content move to a new position (x,y),

Parameters:

• x (int) – the new horizontal offset

• y (int) – the new vertical offset

viewSizeChanged: pyTTkSignal

This signal is emitted when the view content size changed

Parameters:

• width (int) – the new width

• height (int) – the new heighht

Methods

addTopLevelItem(item: TTkTreeWidgetItem) → None

Appends the item as a top-level item in the widget.

Parameters:

item (TTkTreeWidgetItem) – the item to be added.

addTopLevelItems(items: List[TTkTreeWidgetItem]) → None

Appends the list of items as a top-level items in the widget.

Parameters:

item (List[TTkTreeWidgetItem]) – the item to be added.

clear() → None

Clears the tree widget by removing all of its items and selections.

collapseAll() → None

Collapse all collapsable items.

columnWidth(column: int) → int

This property hold the width of the column requested

Parameters:

column (int) – the column position

Return type:

int

dragDropMode() → DragDropMode

expandAll() → None

Expands all expandable items.

indexOfTopLevelItem(item: TTkTreeWidgetItem) → int

Returns the index of the given top-level item, or -1 if the item cannot be found.

Return type:

int

invisibleRootItem() → TTkTreeWidgetItem

Returns the tree widget’s invisible root item.

The invisible root item provides access to the tree widget’s top-level items through the TTkTreeWidgetItem API, making it possible to write functions that can treat top-level items and their children in a uniform way; for example, recursive functions.

Returns:

the root Item

Return type:

TTkTreeWidgetItem

isSortingEnabled() → bool

This property holds whether sorting is enabled

If this property is true, sorting is enabled for the tree; if the property is false, sorting is not enabled. The default value is false.

Return type:

bool

resizeColumnToContents(column: int) → None

rwsize the width of the column requestedto its content

Parameters:

column (int) – the column position

selectedItems() → List[TTkTreeWidgetItem]

Returns a list of all selected non-hidden items.

Return type:

List[TTkTreeWidgetItem]

selectionMode() → SelectionMode

Return type:

TTkK.SelectionMode

setColumnWidth(column: int, width: int) → None

Set the width of the column requested

Parameters:

column (int) – the column position

Return type:

int

setDragDropMode(dndMode: DragDropMode)

setHeaderLabels(labels: List[TTkString]) → None

Adds a column in the header for each item in the labels list, and sets the label for each column.

Parameters:

labels (List[TTkString]) – the list of labels

setSelectionMode(mode: SelectionMode) → None

Sets the current selection model to the given selectionModel.

Parameters:

mode (TTkK.SelectionMode) – the selection mode used in this tree

setSortingEnabled(enabled: bool) → None

This property holds whether sorting is enabled

If this property is true, sorting is enabled for the tree; if the property is false, sorting is not enabled. The default value is false.

Parameters:

enabled (bool) – the sorting status

sortColumn() → int

Returns the column used to sort the contents of the widget. -1 in case no column sort is used

Return type:

int

sortItems(col: int, order: SortOrder) → None

Sorts the items in the widget in the specified order by the values in the given column.

Parameters:

• col (int) – the column used as reference for the sorting

• order (TTkK.SortOrder) – the sorting order

takeTopLevelItem(index: int) → TTkTreeWidgetItem | None

Removes the top-level item at the given index in the tree and returns it, otherwise returns None;

Parameters:

index (int) – the index of the item

Return type:

Optional[TTkTreeWidgetItem]

topLevelItem(index) → TTkTreeWidgetItem | None

Returns the top level item at the given index, or None if the item does not exist.

Parameters:

index (int) – the index of the item

Return type:

Optional[TTkTreeWidgetItem]

Methods Inherited from: TTkAbstractScrollView

getViewOffsets()	Retrieve the vertical and horizontal offsets of the TTkAbstractScrollViewInterface
resizeEvent(w, h)	Convenience function, Event Callback triggered after a successful resize
setPadding(top, bottom, left, right)	Set the TTkContainer's paddings sizes as shown in Layout Topology
update([repaint, updateLayout, updateParent])	Notify the drawing routine that the widget changed and needs to draw its new content.
viewDisplayedSize()	This method returns the displayed size of the TTkAbstractScrollViewInterface implementation.
viewFullAreaSize()	This method returns the full widget area size of the TTkAbstractScrollViewInterface implementation.
viewMoveTo(x, y)	This method is used to set the vertical and horizontal offsets of the TTkAbstractScrollViewInterface
wheelEvent(evt)	This event handler, can be reimplemented in a subclass to receive mouse wheel events for the widget.

Methods Inherited from: TTkContainer

addWidget(widget)
getPadding()	Retrieve the TTkContainer's paddings sizes as shown in Layout Topology
getWidgetByName(name)	Return the widget from its name.
hide()	hide the widget
layout()	Get the Layout
maximumHeight()
maximumWidth()
minimumHeight()
minimumWidth()
paintChildCanvas()
removeWidget(widget)
rootLayout()	This is a root layout mainly used to place items that are not supposed to be inside the main layout (i.e. the menu elements).
setCurrentStyle(*args, **kwargs)
setLayout(layout)	Set the Layout used by this widget to place all the child widgets.
setPadding(top, bottom, left, right)	Set the TTkContainer's paddings sizes as shown in Layout Topology
show()	show the widget
update([repaint, updateLayout, updateParent])	Notify the drawing routine that the widget changed and needs to draw its new content.

Methods Inherited from: TTkWidget

clearFocus()	Remove the Focus state of this widget
close()	Close (Destroy/Remove) the widget
currentStyle()
disableWidgetCursor([disable])
enableWidgetCursor([enable])
focusInEvent()
focusOutEvent()
focusPolicy()
geometry()
getCanvas()
getPixmap()	Convenience function which return a pixmap representing the current widget status
getWidgetByName(name)	Return the widget from its name.
hasFocus()	This property holds the focus status of this widget
height()
hide()	hide the widget
isEnabled()	This property holds whether the widget is enabled
isEntered()
isVisible()	Retrieve the visibility status of this widget
isVisibleAndParent()
lowerWidget()	Lower the Widget below its relatives
maxDimension(orientation)
maximumHeight()
maximumSize()
maximumWidth()
mergeStyle(style)
minDimension(orientation)
minimumHeight()
minimumSize()
minimumWidth()
mouseEvent(evt)
move(x, y)	Move the widget
moveEvent(x, y)	Convenience function, Event Callback triggered after a successful move
name()
paintChildCanvas()
paintEvent(canvas)	Paint Event callback, this need to be overridden in the widget.
parentWidget()
pasteEvent(txt)	Callback triggered when a paste event is forwarded to this widget.
pos()
raiseWidget([raiseParent])	Raise the Widget above its relatives
resize(width, height)	Resize the widget
resizeEvent(w, h)	Convenience function, Event Callback triggered after a successful resize
setCurrentStyle(*args, **kwargs)
setDefaultSize(arg, width, height)
setDisabled([disabled])	This property holds whether the widget is disnabled
setDropEventProxy(proxy)
setEnabled([enabled])	This property holds whether the widget is enabled
setFocus()	Focus the widget
setFocusPolicy(policy)	This property holds the way the widget accepts keyboard focus
setGeometry(x, y, width, height)	Resize and move the widget
setMaximumHeight(maxh)
setMaximumSize(maxw, maxh)
setMaximumWidth(maxw)
setMinimumHeight(minh)
setMinimumSize(minw, minh)
setMinimumWidth(minw)
setName(name)	Set the name of this Instance
setParent(parent)
setStyle([style])
setToolTip(toolTip)
setVisible(visible)	Set the visibility status of this widget
setWidgetCursor([pos, type])
show()	show the widget
size()
style()
toolTip()
update([repaint, updateLayout, updateParent])	Notify the drawing routine that the widget changed and needs to draw its new content.
widgetItem()
width()
x()
y()

Methods Inherited from: TMouseEvents

enterEvent(evt)	This event handler, can be reimplemented in a subclass to receive mouse enter events for the widget.
leaveEvent(evt)	This event handler, can be reimplemented in a subclass to receive mouse leave events for the widget.
mouseDoubleClickEvent(evt)	This event handler, can be reimplemented in a subclass to receive mouse click events for the widget.
mouseDragEvent(evt)	This event handler, can be reimplemented in a subclass to receive mouse drag events for the widget.
mouseMoveEvent(evt)	This event handler, can be reimplemented in a subclass to receive mouse move events for the widget.
mousePressEvent(evt)	This event handler, can be reimplemented in a subclass to receive mouse press events for the widget.
mouseReleaseEvent(evt)	This event handler, can be reimplemented in a subclass to receive mouse release events for the widget.
mouseTapEvent(evt)	This event handler, can be reimplemented in a subclass to receive mouse click events for the widget.
wheelEvent(evt)	This event handler, can be reimplemented in a subclass to receive mouse wheel events for the widget.

Methods Inherited from: TKeyEvents

keyEvent(evt)

This event handler, can be reimplemented in a subclass to receive key events for the widget.

Methods Inherited from: TDragEvents

dragEnterEvent(evt)	This event handler, can be reimplemented in a subclass to receive drag events for the widget.
dragLeaveEvent(evt)	This event handler, can be reimplemented in a subclass to receive drag events for the widget.
dragMoveEvent(evt)	This event handler, can be reimplemented in a subclass to receive drag events for the widget.
dropEvent(evt)	This event handler, can be reimplemented in a subclass to receive drag events for the widget.

TTkTreeWidget Attributes

classStyle
itemActivated	This signal is emitted when the user activates an item by double-clicking or pressing a special key (e.g., Enter).
itemChanged	This signal is emitted when the contents of the column in the specified item changes.
itemClicked	This signal is emitted when the user clicks inside the widget.
itemCollapsed	This signal is emitted when the specified item is collapsed so that none of its children are displayed.
itemDoubleClicked	This signal is emitted when the user double clicks inside the widget.
itemExpanded	This signal is emitted when the specified item is expanded so that all of its children are displayed.