Appendix A: QTREEVIEW
| Rapid-Q Documentation by William Yu (c)1999 |
Appendix A: QTREEVIEW |
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QTREEVIEW Component
QTreeView displays a hierarchical list of items. Items are ordered by their index.
QTreeView Internal Types
TYPE TreeNodeType '' ie. TreeView.Item(0).Text
Text AS STRING
ImageIndex AS INTEGER
StateIndex AS INTEGER
SelectedIndex AS INTEGER
Count AS INTEGER '' Read only
Level AS INTEGER '' Read only
IsVisible AS INTEGER '' Read only
Handle AS INTEGER '' Read only
HasChildren AS INTEGER
Selected AS INTEGER
END TYPE
QTreeView Properties
| Field | Type | R/W | Default |
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| Align | INTEGER | RW | alNone |
| BorderStyle | INTEGER | RW | bsSingle |
| Color | INTEGER | RW | |
| Cursor | INTEGER | RW | crDefault |
| Enabled | INTEGER | RW | True |
| Font | QFONT | W | |
| Handle | INTEGER | RW | |
| Height | INTEGER | RW | |
| HideSelection | INTEGER | RW | False |
| Hint | STRING | RW | |
| Images | QIMAGELIST | W | |
| Indent | INTEGER | RW | 19 |
| Item | ARRAY of TreeNodeType | RW | |
| ItemCount | INTEGER | RW | |
| ItemIndex | INTEGER | RW | |
| Left | INTEGER | RW | 0 |
| Parent | QFORM/QPANEL/QTABCONTROL | W | |
| PopupMenu | QPOPUPMENU | W | |
| ReadOnly | INTEGER | RW | False |
| ShowButtons | INTEGER | RW | True |
| ShowHint | INTEGER | RW | False |
| ShowLines | INTEGER | RW | True |
| ShowRoot | INTEGER | RW | True |
| SortType | INTEGER | RW | stText |
| StateImages | QIMAGELIST | W | |
| TabOrder | INTEGER | RW | |
| Tag | INTEGER | RW | |
| Top | INTEGER | RW | 0 |
| TopIndex | INTEGER | RW | |
| Width | INTEGER | RW | |
| Visible | INTEGER | RW | True |
QTreeView Methods
| Method | Type | Description | Params |
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| AddItems | SUBI | Add items to treeview | STRING, Infinite |
| AddChildItems | SUB (Index%, S1$, S2$, ...) | Add child item at Index% | Minimum 2 |
| Clear | SUB | Clear all items in treeview | 0 |
| Collapse | SUB (Index%, Recurse%) | Collapses node | 2 |
| DelItems | SUBI | Delete items from treeview | INTEGER, Infinite |
| Expand | SUB (Index%, Recurse%) | Expand node, revealing its childs | 2 |
| FullCollapse | SUB | Collapses all nodes | 0 |
| FullExpand | SUB | Expands all nodes | 0 |
| GetItemAt | FUNCTION (X%, Y%) AS LONG | Get the index node at X,Y | 2 |
| InsertItem | SUB (Index%, String$) | Insert item at Index% | 2 |
| LoadFromFile | SUB (Filename AS STRING) | Load items from file | 1 |
| SaveToFile | SUB (Filename AS STRING) | Save items to file | 1 |
| Sort | SUB | Sort all items from A-Z | 0 |
QTreeView Events
| Event | Type | Occurs when... | Params |
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| OnClick | VOID | TreeView was clicked on | 0 |
| OnChange | SUB (Index%) | Selection (not modification) has changed from one item to another | 1 |
| OnChanging | SUB (Index%, AllowChange%) | Selection is about to be changed | 2 |
| OnCollapse | SUB (Index%) | Just after a node has been collapsed | 1 |
| OnCollapsing | SUB (Index%, AllowCollapse%) | A node is about to be collapsed | 2 |
| OnDblClick | VOID | TreeView was double clicked on | 0 |
| OnDeletion | SUB (Index%) | A node in the tree is deleted | 1 |
| OnEdited | SUB (Index%, BYREF S$) | After the user edits a text of a node | 2 |
| OnEditing | SUB (Index%, AllowEdit%) | The user starts to edit the text | 2 |
| OnExpand | SUB (Index%) | After a node is expanded | 1 |
| OnExpanding | SUB (Index%, AllowExpansion%) | A node is about to be expanded | 2 |
| OnGetImageIndex | SUB (Index%) | The treeview looks up the ImageIndex of a node | 1 |
| OnGetSelectedIndex | SUB (Index%) | The treeview looks up the SelectedIndex of a node | 1 |
| OnKeyDown | SUB (Key AS Word, Shift AS INTEGER) | Key held down | 2 |
| OnKeyPress | SUB (Key AS BYTE) | User presses a key | 1 |
| OnKeyUp | SUB (Key AS Word, Shift AS INTEGER) | User releases a key | 2 |
| OnMouseDown | SUB (Button%, X%, Y%, Shift%) | Mouse button held down | 4 |
| OnMouseMove | SUB (X%, Y%, Shift%) | Mouse moves | 3 |
| OnMouseUp | SUB (Button%, X%, Y%, Shift%) | Mouse button is released | 4 |
QTreeView Examples
'' Tree view example, hot tracking through items
SUB TreeViewChange (Node AS INTEGER, AllowChange AS INTEGER, Sender AS QTREEVIEW)
IF Node = 8 THEN AllowChange = 0
END SUB
SUB TreeViewMouseMove (X AS INTEGER, Y AS INTEGER, Shift AS INTEGER, Sender AS QTREEVIEW)
I = Sender.GetItemAt(X,Y)
IF I >= 0 THEN Sender.ItemIndex = I
END SUB
CREATE Form AS QFORM
Center
CREATE TreeView AS QTREEVIEW
Align = 5
AddItems "1","2","3"
AddChildItems 0, "Sub 1", "Sub 2", "Sub 3"
AddChildItems 4, "Sub 1", "Sub 2", "Sub 3"
FullExpand
OnChanging = TreeViewChange
OnMouseMove = TreeViewMouseMove
END CREATE
END CREATE
'-- No real purpose, just change all items
FOR I = 0 TO TreeView.ItemCount-1
TreeView.Item(I).Text = STR$(I)
NEXT
Form.ShowModal
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