widget.Tree
import "fyne.io/fyne/v2/widget"
Usage
type Tree
type Tree struct {
BaseWidget
Root TreeNodeID
ChildUIDs func(uid TreeNodeID) (c []TreeNodeID) `json:"-"` // Return a sorted slice of Children TreeNodeIDs for the given Node TreeNodeID
CreateNode func(branch bool) (o fyne.CanvasObject) `json:"-"` // Return a CanvasObject that can represent a Branch (if branch is true), or a Leaf (if branch is false)
IsBranch func(uid TreeNodeID) (ok bool) `json:"-"` // Return true if the given TreeNodeID represents a Branch
OnBranchClosed func(uid TreeNodeID) `json:"-"` // Called when a Branch is closed
OnBranchOpened func(uid TreeNodeID) `json:"-"` // Called when a Branch is opened
OnSelected func(uid TreeNodeID) `json:"-"` // Called when the Node with the given TreeNodeID is selected.
OnUnselected func(uid TreeNodeID) `json:"-"` // Called when the Node with the given TreeNodeID is unselected.
UpdateNode func(uid TreeNodeID, branch bool, node fyne.CanvasObject) `json:"-"` // Called to update the given CanvasObject to represent the data at the given TreeNodeID
}
Tree widget displays hierarchical data. Each node of the tree must be identified by a Unique TreeNodeID.
1.4func NewTree
func NewTree(childUIDs func(TreeNodeID) []TreeNodeID, isBranch func(TreeNodeID) bool, create func(bool) fyne.CanvasObject, update func(TreeNodeID, bool, fyne.CanvasObject)) *Tree
NewTree returns a new performant tree widget defined by the passed functions. childUIDs returns the child TreeNodeIDs of the given node. isBranch returns true if the given node is a branch, false if it is a leaf. create returns a new template object that can be cached. update is used to apply data at specified data location to the passed template CanvasObject.
1.4func NewTreeWithStrings
func NewTreeWithStrings(data map[string][]string) (t *Tree)
NewTreeWithStrings creates a new tree with the given string map. Data must contain a mapping for the root, which defaults to empty string (“”).
1.4func (*Tree) CloseAllBranches
func (t *Tree) CloseAllBranches()
CloseAllBranches closes all branches in the tree.
func (*Tree) CloseBranch
func (t *Tree) CloseBranch(uid TreeNodeID)
CloseBranch closes the branch with the given TreeNodeID.
func (*Tree) CreateRenderer
func (t *Tree) CreateRenderer() fyne.WidgetRenderer
CreateRenderer is a private method to Fyne which links this widget to its renderer.
func (*Tree) IsBranchOpen
func (t *Tree) IsBranchOpen(uid TreeNodeID) bool
IsBranchOpen returns true if the branch with the given TreeNodeID is expanded.
func (*Tree) MinSize
func (t *Tree) MinSize() fyne.Size
MinSize returns the size that this widget should not shrink below.
func (*Tree) OpenAllBranches
func (t *Tree) OpenAllBranches()
OpenAllBranches opens all branches in the tree.
func (*Tree) OpenBranch
func (t *Tree) OpenBranch(uid TreeNodeID)
OpenBranch opens the branch with the given TreeNodeID.
func (*Tree) Resize
func (t *Tree) Resize(size fyne.Size)
Resize sets a new size for a widget.
func (*Tree) ScrollTo
func (t *Tree) ScrollTo(uid TreeNodeID)
ScrollTo scrolls to the node with the given id.
Since 2.1
func (*Tree) ScrollToBottom
func (t *Tree) ScrollToBottom()
ScrollToBottom scrolls to the bottom of the tree.
Since 2.1
func (*Tree) ScrollToTop
func (t *Tree) ScrollToTop()
ScrollToTop scrolls to the top of the tree.
Since 2.1
func (*Tree) Select
func (t *Tree) Select(uid TreeNodeID)
Select marks the specified node to be selected.
func (*Tree) ToggleBranch
func (t *Tree) ToggleBranch(uid string)
ToggleBranch flips the state of the branch with the given TreeNodeID.
func (*Tree) Unselect
func (t *Tree) Unselect(uid TreeNodeID)
Unselect marks the specified node to be not selected.
func (*Tree) UnselectAll
func (t *Tree) UnselectAll()
UnselectAll sets all nodes to be not selected.
2.1