Version history

Virtual Tree View

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Installation | Inner fundamentals

Version history

Version 4.3.0 - 4.4.2 (December 2004 - November 2005)

Improvement: fixed column implementation completed (code donation by Igor Savkic)
Improvement: ShowScrollbar calls with conditional defines extracted into a new method. Added event that can be hooked by the application to get notified if a scrollbar is about to show or hide. Introduced OnShowScrollbar event.
Improvement: OnGetImageEx event to allow specifying a custom imagelist.
Improvement: GetFirstChecked, GetNextChecked, ClearChecked helper methods (code donation by Azza).
Bug fix: Reselection of a node in multi selection node did not refresh its visual selection appearance.
Bug fix: root node total count not updated during load of streamed nodes.
Bug fix: When loading a node from stream the initial total height is always set to the current default height of the tree, not the height of the node that is being loaded.
Bug fix: Mantis #260, TBaseVirtualTree.ReadChunk has applied total height of loaded nodes multiple times.
Change: Moved DoCancelEdit and DoEndEdit to the protected section. Don't know it ever could end up in the public section. Use CancelEditNode and EndEditNode instead.
Improvement: Hint window class dynamically assignable. TBaseVirtualTree.GetHintWindowClass
Change: A few GetPrevious* methods were still testing for an initialized parameter.
Change: OnMouseWheel published.
Improvement: Painting of normal, selected, state and overlay image is now done using standard image list access. This allows to use specialized image lists (e.g. with full alpha channel support).

Version 4.0.16 - 4.3.0 (December 2003 - December 2004)

Improvement: Delphi 2005 compatibility.
Bug fix: InternalData may return nil, so its result must be checked before accessing it.
Bug fix: WM_CURSOR in TVTHeader.HandleMessage used the screen standard cursors as default instead that of the tree.
Change: If the hot tracking cursor is crDefault when hot tracking is enabled then that of the tree is used instead.
Bug fix: TVirtualTreeColumn.SetIndex removed as it caused reindexing of the position array (which is wrong).
Bug fix: check for existing window handle before posting a message for the node editor.
Change: published events OnAdvancedHeaderDraw and OnHeaderDrawQueryElements in TVirtualDrawTree.
Improvement: tree state tsCheckPropagation is now only reset after a tristate check operation has finished (before the final OnChecked event). Therefore the tree state will include tsCheckPropagation while child nodes are checked or unchecked.
Change: ExecuteAction fixed (incorrect conditional definitions)
Change: DoBeforeItemErase was in the wrong place.
Bug fix in InternalDisconnectNode: When an invisble node is removed from its parent the height of this parent node no longer is changed.
Bug fix: Char handling for incremental search killed the dead char due to a problem with ToASCII.
Improvement: Removed ParentBackground property (also for D7), it is useless because of the own background handling of VT
Improvement: (better multimonitor support) Checks for true screen location for the hint.
Bug fix: TVirtualTreeColumn.SetOptions + : Check for a valid window handle of the tree before doing invalidation.
Improvement: In VT.WMKeyDown additional checks for page up/down, to scroll not more than what fits in one page under all conditions.
Bug fix: In VT.HandleMouseDown check for assigned hit node before doing selection with alt key.
Bug fix: VST.DoNewText, inserted call to UpdateHorizontalScrollbar to account for edited nodes, which now have a significant other length.
Change: Moved some methods to higher visibility.
Improvement: non-tiled background images (code donation by Richard Pringle).
Improvement: Configuration compiler switches are now located in an additional file (VTConfig.inc).
Improvement: Reset of all global objects to nil on finalization. Explicit initialization of Initialized and NeedToUnitialize because of trouble when VT is used in dynamically loaded packages.
Bug fix: Dragging did not work with full row selection and toFullRowDrag switched on while drag mode is dmManual.
Improvement: Mouse button flags are now passed through OnDragOver and OnDragDrop.
Bug fix: The internal node edit now uses clWindowText instead of clBlack as text color to work properly on high contrast color schemes.
Improvement: Introduction of toDisableAutoscrollOnEdit. It prevents a node with a large caption to scroll horizontally when is edited.
Change: Added test for HandleAllocated to TVirtualTreeHintWindow.AnimationCallback.
Improvement: Update edit bounds when a node's height is changed and editing is active.
Change: Partly took back the change for overlay images. VT still must support overlay indices the old way (e.g. for system image lists). Overlay indices >= 15 now use the new mechanism and are drawn without the need to set TCustomImagelist.Overlay.
Bug fix: Insertion order of nodes was wrong in MoveTo for amAddChildLast.
Change: removed change lock from worker thread. It isn't used any longer.
Bug fixes: Mantis bug entries #158, 162-172, 174-191, 192-196, 199, 202, 204, 205, 208, 212, 215, 216, 218, 220, 221, 228.
Other small improvements.

Version 3.8.3 - 4.0.15 (May - November 2003)

Bug fix: Initial draw selection with the mouse at the end of large trees (1+ million nodes) started with a huge delay.
Improvement: Better synchronization of tree windows and the worker thread.
Change: WM_RELEASEEDITLINK removed. It is sometimes problematic to release the link asynchroniously. Another mechanism is used instead.
Improvement: check images are now public, to allow to use them for own drawing code.
Bug fix: using Tree.CheckState[Node] in OnInitNode caused an infinite recursion.
Improvement: toFullRowDrag introduced
Improvement: tsCheckPropagation introduced
Improvement: node selection change with the mouse and modifier keys is now more consistent to Windows standard controls.
Improvement: new event OnGetCellIsEmpty
Improvement: TVTColors.HeaderHotColor introduced, default value is clBtnShadow as it was hard wired before.
Improvement: Auto spring feature. Size changes of the header are evenly spread over all columns, which are enabled for this feature. New options introduced: coAutoSpring, hoAutoSpring.
Change: Header stream version increased to 3. This was necessary because the new coAutoSpring options increased a column's option size from byte to word (now there are 9 options).
Improvement: Edit property of TStringEditLink promoted to public.
Improvement: ShortenString better takes right-to-left contexts into account.
Improvement: toAlwaysHideSelection introduced. Allows to hide node selections entirely.
Improvement: toUseBlendedSelection introduced. Allows to have translucent node selections.
Bug fix: Mantis bug entries #140, 144, 125, 122, 129, 147, 148, 149, 152 - 157.
Improvement: Mantis feature request #113, toSimpleDrawSelection introduced.
Improvement: ComputeNodeHeight introduced. Helper method to delegate node height calculation to the tree.
Improvement: Alt key might be pressed when clicking in the tree. This allows to start drawing the selection rectangle also on node captions and images (which would otherwise start dragging).
Bug fix: ValidateCache was not always called in ToggleNode when InvalidateCache was used.
Bug fix: FLastHintRect was sometimes not reset preventing so a new hint to appear.
Bug fix: Redundant ChangeCheckState in HandleMouseDown removed.
Bug fix: OnHeaderDblClick was triggered even if the column was set to be unclickable.
Bug fix: Wheel panning and scrolling was not possible if toAutoScroll was not set. This option has another meaning and should not impact wheel handling.
Bug fix: VT control could not be set as ActiveControl at design time.
Bug fix: In method ContentToText it could be that the text contained the separator char as regular character, so it was necessary to wrap the text with quotation marks then.
Bug fix: Bidi mode and aligment was not correctly considered in UpdateEditBounds when grid extensions were enabled.
Improvement: Check for nil hint data in TVirtualTreeHintWindow.CalcHintRect just to be on the safe side.
Improvement: TVirtualTreeColumn.ComputeHeaderLayout is now virtual to allow descendants to change the layout.
Improvement: toFullVertGridLines, vertical grid lines can be drawn over the full client area height.
Improvement: flickering on column resizing is gone.
Improvement: System conformal border width calculation for certain tasks.
Improvement: Animation parameter for TVTHeader.AutoFitColumns to avoid the size animation (default: True).
Improvement: ParentFont property for the header. Default is False to stay compatible with older tree versions.
Bug fix: cursor rectangle for spanned columns in normal hint mode was too small.
Feature: the implementation is now more than 30.000 lines in size.
Bug fix: Access violation fixed, which was sometimes caused by setting VT to edit mode if the old edit link was not freed yet (because it was still handling a message).
Improvement: Hint animation now does no longer stop quick switches to new hints.
Improvement: ParentBackground property published.
Bug fix: vsAllChildrenHidden and vsExpanded are now removed from a node's state if there are no child nodes anymore
Improvement: column width limit to 10000 is now only applied on non-NT systems (Win9x/Me).
Improvement: single letter mode in incremental search is not used if the current node also fits the repeated character.
Bug fix: correct theme change handling when switching to classic mode.
Improvement: new event OnMeasureItem, new handling for application driven node heights. TCustomVirtualStringTree.ComputeNodeHeight implementation to easy node height computation for multi line nodes.
Improvement: Header is nil'ed when the tree is destroyed and checked before used in TBaseVirtualTree.Notification in order to avoid potential problems accessing an invalid address.
Bug fix: The cut and copy pending states in the tree and participating nodes were not removed.
Bug fix: csPaintCopy was not considered when painting (used for TWinControl.PaintTo, e.g. in Form.Print).
Bug fix: DT_NOPREFIX added for header text output.
Bug fix: Thread safe check for current tree reference in the worker thread, as it can be reset before it was used.
Bug fix: Color change for non-standard background colors after all columns were hidden.
Improvement: new node background erase action (eaNone).

Version 3.6.3 - 3.8.2 (February - April 2003)

Bug fix: Local tree reference in worker thread is erased when a tree removes itself from the waiter list.
Improvement: TStringEditLink public methods are now virtual.
Change: A couple more methods in the header and columns are virtual now.
Improvement: Introduction of TVirtualTreeColumnsClass and GetColumnsClass in TVTHeader. This allows for more customization.
Improvement: DetermineHiddenChildrenFlagAllNodes, tsUpdateHiddenChildrenNeeded, Optimized flag determination to speed up mass changes of the visiblity state of nodes.
Improvement: Unicode support for inplace editing by utilizing the TNT controls package. This support is by default disabled and can be made active by enabling the compiler symbol TntSupport.
Improvement: MoveTo is now allowed with Source and Target being the same node, but only for amInsertBefore/After and child nodes only.
Bug fix: Mantis bug entry #112, #108, #100, #103, #119
Improvement: All public images properties changed from TImageList to TCustomImageList. (Mantis entry #110)
Bug fix: Handling for manipulating columns via index and manual deletion.
Improvement: Some small additions to aid customizations by descendants.
Bug fix: GetMaxColumnWidth did not consider if there were vertical tree lines.
Improvement: The internally used edit control in the tree edit link can be changed now by assigning a new control to the Edit property. The edit link will take over the ownership of the new control then!
Improvement: Header paint info in advanced custom draw events is now changable (declared as var instead const).
Bug fix: The number of visible nodes was not updated correctly under certain circumstances.
Bug fix: Invalid tree data in TVirtualTreeHintWindow.IsHintMsg was used under rare conditions.
Bug fix: Exception in FindInPositionCache due to invalid position cache data.
Improvement: VT may optionally use a local node memory manager for node allocations. This will increase allocation speed by about 200% for large trees (so node creation and destruction is about 3 times faster). Small trees do not benefit that much from it, so the node memory manager is disabled by default. See UseLocalMemoryManager for more information.
Bug fix: State change management used in the worker thread sometimes caused a deadlock.
Improvement: UpdateScrollBars is now virtual.
Bug fix: The structure change event was not triggered during ProcessOLEData when nodes were copied.
Bug fix: Failure to initialize the OLE subsystem does no longer throw an exception. It is a non-critical problem if it fails, only OLE drag'n drop and clipboard operations do not work then.
Bug fix: Check state changing did not consider the permission of the OnChecking event. Fixing this has the wanted side effect that you cannot change a node's check state if it has a tristate checkbox and none of its child nodes are initialized yet.
Bug fix: DT_NOPREFIX was not used for single line nodes.
Improvement: speed up for column erasing
Improvement: Advanced header custom drawing with the ability to schedule element drawing either by the application or the tree.
Bug fix: Node rectangle calculation in ClearSelection is wrong.
Bug fix: all remaining (and fixable) Mantis bug entries fixed.
Improvement: OnStateChange, DoStateChange, centralized state change method with notification for event sink.
Improvement: DeleteSelectedNodes is now virtual

Version 3.5.8 - 3.6.2 (December 2002, January 2003)

Improvement: hint flickering on key press is gone.
Improvement: Position cache filling is now more fail save.
Bug fix: Mantis bug entry #75.
Bug fix: Mantis bug entry #74.
Bug fix: Mantis bug entry #77.
Bug fix: Mantis bug entry #82.
Bug fix: system check images size does not fit.
Optimization: minimal change in HandleIncrementalSearch.
Improvement: Full boolean evaluation is permanently switched off as VT heavily relies on that setting.
Improvement: The buffer for incremental search is now public.
Bug fix: Column additions now set a column's default properties first before doing default notification handling in order to have them available when updating the header/tree as result of the TCollection.Changed event.
Improvement: The header font is adjusted according to the system font settings.
Improvement: Exit code for internal node editor does no longer prevent focus switch to other controls.
Improvement: Multiline support for node captions. New node state vsMultiline (default: off). Note: This support requires Windows NT (4.0/2000/XP and up) for word breaking. The word breaking feature is not available on Windows 95/98/Me systems.

Version 3.5.1 - 3.5.7 (November 2002)

Improvement: CanFocus is not virtual in Delphi 4 (-> conditional defination of the override keyword).
Improvement: Most of the properties for the internal edit control are now public.
Improvement: Edit control in the standard edit link is now accessible via a protected read only property.
Improvement: Initialization of global structures is now delayed until the first tree is created. This allows use of VT also in special applications like property sheet extensions.
Improvement: Updating/Updated pair included in VT.Loaded to avoid design time modification state changes.
Work around: CM_AUTOADJUST introduced to decouple edit window notification and resizing for Win9x/Me systems.
Improvement: Reintroduction of automatic exit handling for the internal node editor.
Improvement: System check and flat check images introduced.
Improvement: Exchanged 'x' for ' ' as the dummy hint string to avoid showing up a 'x' when using TAppliction.Hint.
Improvement: The virtual string tree does incremental search independently. Use OnIncrementalSearch if you want to override the default behavior.
Improvement: VK_BACK can be used in incremental search to return to the previous pattern (deletes the last char in the current pattern and search temporarily backwards).

Version 3.4.10 - 3.5.0 (October 2002)

License: Virtual Treeview is now released under a double license: MPL or LGPL.
Bug fix: hit test in other than the main column sometimes returned a check box hit.
Improvement: new property SelectionBlendFactor. Can be used to adjust the blend effect of the selection rectangle (if it is used).
Improvement: Painting of node images improved to have it exactly as used in standard controls.
Bug fix: pressed state for a checked node is now reset if another key than VK_SAPCE is pressed.
Bug fix: font handling in Print caused wrong output on screen after print.
Improvement: Ability to link Troy Wolbrink's Unicode aware popup menu added. See VTHeaderPopup.pas for more details.
Bug fix: vsAllChildrenHidden is now removed from the parent node in AddChild.
Work around: focus changes between VT and wrapped non-VCL controls like TWebBrowser should be accompanied by resetting the ActiveControl property of the tree's owner form.
Improvement: Consideration of drag objects not derived from the base control drag object.
Improvement: Keyboard handling for expand/collapse extended to main keyboard (formerly only numpad).
Improvement: Consideration of the parent form when checking if focusing of a tree is allowed (the VCL doesn't this).
Work around: When used in a package the special hint window is not freed correctly by the VCL, which causes an access violation on shut down.
Bug fix: Clipboard format enumeration should be sorted by priority.
Improvement: TVTHeader.CanWriteColumns introduced to allow descendants to avoid writing columns to the DFM.
Renamed Canvas to TargetCanvas in TVTBeforeItemEraseEvent (for consistency).
Support for application defined drag objects (VCL drag'n drop only).
Bug fix: NC border painting considers now client edge too (if border width is > 0 and border style = bsSingle).
ChangeScale implementation / toAutoChangeScale, This is used for big fonts to scale the default node height automatically.
Text alignment is preserved in DrawTextW.
WM_THEMECHANGED also wrapped with ifdef ThemeSupport.
More default values added.
Tree states property is now writable. Writing to it will not trigger any action, but can be used by descendants.

Version 3.4.1 - 3.4.9 (August - September 2002)

Bug fix: Delphi Gems Issue Tracker #41.
Bug fix: Delphi Gems Issue Tracker # 38, The MDI problem work around code in TBaseVirtualTree.WMKillFocus was removed as the problem it was to fix does no longer appear but another problem was created by it.
Bug fix: The tree options were freed in the tree's destructor but used again afterwards (in Clear).
Bug fix: inherited call in TBaseVirtualTree.Notification included.
Selection with Ctrl-klick is handle the same way as Explorer does it (selection on mouse up instead down).
Added reset for last searched node (incrementals search) when the search timer is deactivated.
Work around problems with keypresses while doing hint animation in IsHintMsg
Change in Animate, use Cardinal instead Integer.
Bug fix in ScrollIntoView, scrollbar visibility was not correctly tested.
Bug fix in WMKillFocus, if toGhostedIfUnfocused is used then the focused node should be redrawn too.
Bug fix in CopyTo, if user canceled node copy then result is nil now.
Correction, NewParent in TVTNodeMovingEvent and TVTNodeCopyingEvent is now Target, because the attach operation might have been a sibling action, where NewParent would be inappropriate.
Added all possible default values to TVirtualTreeColumn.
Drop effect support for VCL drag'n drop.

Version 3.3.3 - 3.4.0 (July 2002)

Delphi 7 compatibility.
Bug fix for clipboard formats. The internal clipboard formats array was erronously never used.
Bug fix for freeing image lists if they can get destroyed before the tree.
Bug fix for ChildrenOnly in IterateSubtree, if the given node has no child nodes.
Introduced NodeParent property in Virtual Treeview to ease navigation and manipulations.
Improved client area invalidation check.
New paint option introduced (toGhostedIfUnfocused).
New option toDisableAutoscrollOnFocus introduced, to prevent a tree from scrolling horizontally after a column received the focus, but was not fully visible.
GetTotalCount does not use BeginUpdate/EndUpdate but simple increment/decrement of FUpdateCount to avoid recursion problems.
DetermineHitPositionLTR and DetermineHitPositionRTL are now virtual.
PaintCheckImage, PaintImage, PaintNodeButton and PaintTreeLines are now protected (instead private) and also virtual. This will allow for even further customizations of VT.
Check for FSelectionCount > 0 in RemoveFromSelection to improve stability.
toReadOnly introduced.
SetItemHeight renamed to SetDefaultNodeHeight.
TVTHeader.Invalidate promoted to public.
Update lock for DeleteChildren operations to avoid access to invalid pointers under certain circumstances.

Version 3.2.0 - 3.3.2 (May - June 2002)

Fixed hit determination bug (appeared when using margins in the tree).
Support for Visual Form Inheritance (VFI) for the header.
Bug fix for loading nodes from stream which are invisible but their parent is expanded.
Improved theme support. Now TThemeServices from the Windows XP Theme Services (another free software from Delphi Gems) is used. You must now explicitely add a manifest to your application! This is no longer done automatically by the tree.
Bug fix: autoscroll in VCL drag mode.
Bug fix: shifted characters for incremental search.
VST lets now first the ancestor/application render to clipboard before it tries itself.
Application might modify TargetCanvas.TextFlags in OnPaintText to control the output of normal and static text (currently background only).
Correct bidi mode window styles.
Bug fix regarding vsAllChildrenHidden node state (DetermineHiddenChildrenFlag).
Bug fix in NC painting (removed child window clipping).
Bug fix horizontal scrolling (ScrollIntoView). Improved horizontal scroll into view.
InternalConnectNode and InternalDisconnectNode are protected now.
InitNode in GetHitTestInfoAt to avoid access to uninitialized nodes under certain circumstances.
Default node text is only stored if it differs from 'Node'.
Printer font assignment fixed.
Bug PaintTree for OnPaintBackground fixed. The owner draw mode is now called with the correct window origin set.
New event OnHeaderDraggedOut.
Switch to minor version 3.2.
Hide selection in full row selection mode.
bug fixes
other small changes

Version 3.0 - 3.1.9 (January - April 2002)

First public beta version of the Virtual Treeview CLX version.
DetermineNextCheckState is now protected and virtual.
Tree printing.
UpdateAction only if tree is focused.
Consideration of the user setting for wheel scroll lines.
Limit drag over node hits for report mode (like listview).
All column indexes are now consistently using TColumnIndex (instead Integer).
Minor changes to make custom implementations of auto column resize possible.
Wheel panning and auto scrolling, option toWheelPanning.
vsClearing node state for optimizations.
Update*Scrollbar methods are now public.
toAutoAcceptEditChange.
MoveTo within a tree now keeps focused node instead resetting it.
WMContextMenu cancels now also drag operations.
PaintTree is now public.
WM_CANCELMODE included.
Bug fix: IStream storage format does not work with OLEFlushClipboard -> had to remove it (HGlobal is still available).
Other bug fixes.

Version 2.7. build 2-6 (December 2001)

child controls are now correctly scrolled too if there is a background image
tree cursor is now only applied when there is no global cursor (Screen.Cursor) is set
prevented resize of the edit when grid extensions are active
selection anchor setting when the first selected node is set in code
compiler switch ReverseFullExpandHotKey introduced
Renamed CreateEditor to DoCreateEditor to be consistent with similar methods (DoCreateDataObject
drastically simplified auto expand code, it also works now as in Explorer
space handling limited to nodes which have a check box/radio button and if check support is enabled, otherwise space characters are used for incremental search
change events rework
ScrollIntoView allows now for vertical centering, option toCenterScrollIntoView
help contexts for exceptions, EVirtualTreeError now in interface section to allow testing for it in apps.
ResetRangeAnchor
VT allows now two storage formats for drag'n drop and clipboard transfers (HGlobal and IStream). Default format is IStream as it does not need as much memory during construction as HGlobal. It is also a faster in usage.
implementation of events in IDataObject (advise/unadvise sinks etc.) using IDataAdviseHolder
overloaded GetNodeAt variant which only takes X and Y (in client coordinates)
ILC_COLOR32 for image lists is only used for Windows NT systems, this will help avoiding GDI trouble on Win9x/Me
small changes
bug fixes

Version 2.6, build 3-14, Version 2.7.1 (November 2001)

F2 alone makes the tree going into edit mode, no longer any modifier key allowed
added Canvas.Lock/Unlock in PaintTree
added TDragControlObject assignment in CMDrag
further small changes for BCB compatiblity
drag imager helper interface support included thank Jim Kueneman's excellent preparatory work
structure change event trigger in AddChild
some minor optimizations
initial check state setting when changing a check box type
fmTransparent (button fill mode)
correct tree window border for themes (still flickers a bit, need any documentation for this)
theme style is cached now to speed up frequent checks
improved editing (default editor behavior), correct frame for themed application
custom checkimages work now also with a themed tree
OnGetCursor, OnGetHeaderCursor, TVTGetCursorEvent, TVTGetHeaderCursorEvent, DoGetCursor, DoGetHeaderCursor
changed coMovable to coDraggable, (it was never used so far) and made it actually working
published Action property
categorisation of properties for the IDE
toAutoDeleteMovedNodes
visible count bug fix
improved header rect determination and usage
reset of hot node if focused node is changed
check button improvement for XP styles
small tree painting rework
TColumnIndex, TColumnPosition (to utilize better type checking)
overloaded ColumnFromPosition variant to get a column index from a position index
TVTHeaderDraggedEvent, new parameter in OnHeaderDraggedEvent
scrollbar reset when hiding it
Ctrl-A now considers selection constraints
no image blending if the tree is unfocused
improved VCL drag handling
HasPopupMenu
other small changes
bug fixes

Version 2.5, build 39-40; 2.6, build 0-2 (October 2001)

Release candidate 2 for the beta testers and early adopters
Full Windows XP theme support
Legacy code included for XP style support on non-XP systems (TCheckImageKind, TVTHeaderStyle, TVTButtonFillMode, XPImages, DrawXPButton, node buttons)
Node height bug fix for loading trees from stream
VCL drag handling improved
Update blocker in AddChild
Property DragCursor published
ILC_COLOR32 is now used for image list creation (instead ILC_COLOR16) to allow for XP alpha blending
ContentToXXX routines consider now hidden columns
toFullRepaintOnResize
Header drop mark is not shown if the column being dragged is also the current drop target
TBaseVirtualTree.GetHeaderClass (allows creating an own header class)
Correct space distribution for centered column headers showing also the sort indicator
Reset of FRangeAnchor when node is deleted
Conditional compilation of flat scroll bars (see symbol UseFlatScrollbars)
Synchronous update mode (BeginSynch, EndSynch, tsSynchMode, usBeginSynch, usSynch, usEndSynch)
toReportMode in TreeOptions.MiscOptions, to even better simulate TListView
TVTDropMarkMode for header custom draw
Other small changes
Bug fixes

Version 2.5, build 23-38 (September 2001)

Windows XP style check images
more available check images
MDI child parent form problem work around in TBaseVirtualTree.WMKillFocus
check for destruction of the header popup
published OnContextPopup
stop draw selection mode before inherited mouse button up handler opens a popup menu
corrected some spelling errors
SetVisible improvements
FullCollapse changed again, it does not initialize nodes anymore
CanShowDragImage is now virtual
changes to provide a drag image of the tree without showing it (for descendants which have own image handling)
conditional focus setting
GetFirstVisibleChild(NoInit), GetNextVisibleSibling(NoInit), GetPreviousVisibleSibling(NoInit)
VisiblePath now checks for vsVisible style and sets it if VisiblePath is set to True
bug fixes in visibility setting
toAutoHideButtons auto option
vsAllChildrenHidden node flag
VCL drag image bug fix (external drag images)
small improvement in DrawTextW
bug fixes background painting
bug fixes VCL drag image painting (for external drag images)
changed OnDrawHeader to OnHeaderDraw to fit it closer to the other header events
shadows for hints and tooltips
Windows XP style header drawing
TVTButtonFillMode, ButtonFillMode
alpha blended selection rectangle
properties DrawSelectionMode, SelectionRectangleBlendColor and SelectionRectangleBorderColor
OnHeaderDragged published
removed TVTEdit.WMKillFocus
TCustomStringTreeOptions
adjustments so that TCustom... trees only use and return TCustom... options versions
other small changes
bug fixes

Version 2.5, build 1-22 (August 2001)

removed TVTEdit.WMKillFocus
TCustomStringTreeOptions
adjustments so that TCustom... trees only use and return TCustom... options versions
hint positioning
tree options are now really overrideable and extendable
IsVisible[Node] := True now makes a node really visible (expands all parent nodes)
significant speed improvements for ContentToXXX routines
better Delphi 6 compliance
EndUpdate does nothing if the tree is being destroyed
double click on state icon does toggle node too
InvalidateNode checks now for allocated handle
GetMaxRightExtend now correctly includes FMargin in entire width
DoCanEdit, GetImageIndex (separated from DoGetImageIndex), DoGetText called by GetText
improved key conversion for incremental search
support for standard actions
options splitted into sub-options, property Options is now a class instead of a set
new options toUseBlendedImages and toAutoScrollOnExpand
DoBeforeCellPaint is now called in PrepareCell to allow customization after column color application
consolidated DoDrag* and Drag* methods, DoDrag* methods only call their appropriate events
AddChild and InsertNode can now take a pointer to user data which is placed into the first four bytes of a node's user data area (there must of course at least be 4 bytes user data).
vsInitialUserData to indicate a node needs OnFreeNode even if it is not "officially" initialized
FDragSelection is now also a protected property
LineMode
ContentToRTF improvements for correct table building
ContentToHTML improvments and bug fixes
changed CF_RTF* to CF_VRTF* to avoid identifier conflicts
internal data handling improved, method AllocateInternalDataArea, method InternalData
improved text painting
rounded selection rectangles, property SelectionCurveRadius
selection border colors
hatSystemDefault, DoGetAnimationType
small changes
bug fixes

Version 2.4, build 1-34 (May to June 2001)

introduced build numbers
Delphi 6 compatibility
brush alignment bug for dotted lines fixed
test for TYMED_HGLOBAL is now done using a mask instead of direct comparation
tree column classes can now be changed by descendants, see TBaseVirtualTree.GetColumnClass
TVTRenderOLEDataEvent, property OnRenderOLEData, DoRenderOLEData TVTGetUserClipboardFormats, DoGetUserClipboardFormats, property OnGetUserClipboardFormats
removed ScrollIntoView from AddChild and InsertNode
property OnPaintBackground, DoPaintBackground
TVirtualTreeColumn.LoadFromStream adjustments for the new header stream version
BeginDrag is again public, TControl already has this method in the public section
GetFirstSelected and GetNextSelected iterate now through the tree as every other of those methods returning so the nodes in logical order
GetFirstCutCopy, GetNextCutCopy
ContentToRTF, ...HTML, ...CSV, ContentToClipboard
GetFirstInitialized, GetNextInitialized, GetPreviousInitialized, GetLastInitialized
on expanding scroll child nodes into view
new property editor for clipboard formats
procedures RegisterVTClipboardFormat etc. added
property ClipboardFormats added
IDataObject handling and customization added
trees render their clipboard formats now on their own behalf, IDataObject does only dispatch calls
OLEFormats property removed
clipboard handling reworked
TVTDataObject, to have two instances (one for dragging, one for clipboard)
IDataObject is no longer implemented by the drag manager
renamed TVTMoveRestriction to TVTDragMoveRestriction
correct background erasing for animated toggle
Incremental search included in WM_KEYDOWN handling instead WM_CHAR with proper ANSI to Unicode char conversion.
OnUpdating event, DoUpdating method
improved FullExpand, FullCollapse
improved AutoFitColumns
header stream version increase
Color, coParentColor, poColumnColor for columns (streaming and assignment updated accordingly)
no scrollbar updates anymore in AdjustTotalHeight to avoid unwanted side effects
Editors can now prevent node edit stop. CancelEditNode, EndEditNode, DoCancelEdit and DoEndEdit are now functions and return True if editing was stopped.
small changes in ReinitNode/Children
workaround for an unwanted drop action when dropping while auto scrolling
IVTDragManager
tsNeedRootCountUpdate
WM_NCRBUTTONDOWN in header
change of focused column with hot keys in grid mode is now limited to not-full-row-select mode
checks for update count in ToggleNode
CM_FONTCHANGED
SetChildCount/property ChildCount accepts now nil to change the top level node count
improved GetHasChildren
incremental search improvements
GetLastVisible, GetLastVisibleNoInit
Changed semantic for GetLastChild, GetLastVisibleChild, GetLastChildNoInit and GetLastVisibleChildNoInit. They do not iterate the entire child and grand child list but only the child list of the given node.
Deeper iteration to grand children is done via GetLast, GetLastNoInit, GetLastVisible and GetLastVisibleNoInit
customizable line styles
DoGetPopupMenu
OnDragDrop event has a changed parameter list (no open array as parameter to avoid trouble with BCB)
public property Image of TVTDragImage to have access to the internal drag image bitmap
TVTNodeAlignment, property NodeAlignment
incremental search
key handling for non-grid mode improved
small improvements
bug fixes

Version 2.4 (April to May 2001)

key handling for non-grid mode improved
voDisableDrawSelection (32 bits are now used for options, can't add any more)
voHideSelection
GetLast, GetLastNoInit
incremental search (TVTSearchDirection, TVTIncrementalSearch, SearchTimer, event OnIncrementalSearch, DoIncrementalSearch, TVTIncrementalSearchEvent, TVTSearchStart, IncrementalSearchStart)
improved header timer handling
improved key navigation in grid mode
Virtual Explorer Tree (VET) written by Jim Kueneman is now part of the package
VK_HOME and VK_END set now first and last column correctly
removed ivsVisible style because of unpredictable interferences with other code
columns store their last width and can restore it
TVirtualTreeColumn.RestoreLastWidth, TVTHeader.RestoreColumns
restore last column widths
workaround for bad implementation of disabled images in TImageList
brush alignment for drawing of nodes with odd height
dotted lines implementation improved, tree lines are now dotted drawn too
Column parameter in TVTDragAllowedEvent
flat check images, ckFlat
InvalidateChildren
arrow key navigation limited to grid extension, otherwise (extended focus) normal behavior
VK_TAB handling, WantTabs property
published OnShortenString in the string tree
introduced a build number in the main version number
toggle animation only if not the last visible node to be expanded
CharCode in OnKeyAction is now a variable to allow changing it
nodes in SelectAll are now initialized
Position in TVTPopupMenu event
tsVCLDragging, tsOLEDragPending, tsOLEDragging
limited auto scroll to draw selection and dragging
AutoFitColumns
public property EditLink
ProcessMessage in IVTEditLink
improved change handling
InvalidateColumn
TVirtualTreeColumns.IsValidColumn
draw selection is now also possible with full row select
OnScroll, DoOnScroll, TVTOnScrollEvent
scrolling if scrollbar is not visible
UnselectNodes
deselection with Ctrl+Shift if last focused node is not selected
node toggle improvements
background image offsets as properties
more BCB adjustments
animated hints improved
animated toggle improved
method Animate (general animation support)
initial range anchor setting if there was not yet a focused node
animation duration
PaintImage improvements for transparent images and full row selection
function Path
other small changes
bug fixes

Version 2.3 (March to April 2001)

tsIterating state (checks in DeleteNode and DeleteChildren)
paint optimizations
selected images are dimmed now
ShortenString, DoShortenString, OnShortenString event
OnKeyAction
scroll bar improvements
application defined check image list
internal data handling
drag image implementation finished (finally, this was really tough stuff because of the alpha blended image and updates in non client area)
FormatEtcList in the drag manager is now accessible through a property
clipboard handling
GetFirstNoInit (renamed GetFirstNode to GetFirst as it is more consistent)
small changes in TBaseVirtualTree.DoEdit;
restructuring of node checking
high color format for internal image lists
NewParent in OnNodeCopying
other small changes
bug fixes

Version 2.2 (March 2001)

MMX feature check
property OffsetXY
drag image
improved dragging
general drag management improvements
TVTDragImage
alpha blending
Watcher (critical section) introduced
MMX AlphaBlend implementation
improved image painting (ghosted, overlay etc.)
hoDblClickResize
TVirtualTreeColumns.AnimatedResize
column resize on double click
GetMaxColumnWidth
poDrawFocusRect, poDrawSelection in paint options
ChildNodesOnly in IterateSubtree
OnColumnClick, OnColumnDblClick
HandleMouseDblClick, WM_RBUTTONDBLCLK, WM_MBUTTONDBLCLK
TVTDragDropManager.SetOLEFormats is now overridable
hint positioning
reset of node widths on main column switch
optimized tree and header painting
edit mode for item clicks beside the label when grid extensions are set
TVirtualTreeColumn.GetAbsoluteBounds
tsPainting state
simple DrawTextW implementation (works also on Win9x)
improved selection rect painting
tsValidationNeeded
check event rework
PrepareGridExtensions
CM_ENABLEDCHANGED for desgin time
public header click index
draw selection improvement for all text alignments and bidi modes
more header mouse events (OnHeaderDblClick, OnHeaderMouseDown, OnHeaderMouseMove, OnHeaderMouseUp)
virtual event trigger methods for those mouse events
multiline hints
THitPositions
other small changes
bug fixes

Version 2.0 to 2.1 (January to February 2001)

improved hinting (accounts now for alignment and directionality)
improved GetDisplayRect
FNodeCache removed
BidiMode in OnDrawNode
DetermineHitPositionLTR, DetermineHitPositionRTL
improved GetHitTestInfoAt
improved GetNodeAt method
FindInPositionCache
made the header the sender in all events related to the header (e.g. OnHeaderClick)
WM_PRINT, WM_PRINTCLIENT
Text property for TVirtualStringTree
corrected header painting for various border style combinations (WS_BORDER, WS_THICKFRAME, WS_EX_CLIENTEDGE)
check for recursive hint animation loop entrance
voPopupMode
Tree.Assign
Ctrl-A handling (select all)
context menu key handling (popup menu)
DoPopupMenu
right-to-left drawing
some more adjustments for C++ Builder
improved column auto sizing and recover for zero-sized columns
columns can now be used even if the header is invisible
column autosizing and hints while editing
GetNodeAt can now take absolute and relative coordinates
TWMContextMenu declaration for Delphi 4
TChangeReason for OnStructureChange
hint window improvements for RTL columns and user defined fonts
drag manager referencing redesigned, no explicit reference count modifications necessary anymore
complete paint restructuring, now there is only one method to paint the tree: PaintTree, which can be used for normal paint, printing, drag image etc.
TVirtualTreeColumn.GetDisplayName changed to show a column's name in the property inspector if it only contains ANSI characters
column alignment and bidi consideration, added general property in TVirtualTreeColumn
properties IsVisible (changed semantic), VisiblePath, FullyVisible
filtered IterateSubtree
WM_CONTEXTMENU
vsVisible, full visibility implementation for individual nodes (see also GetVisibleParent, GetNextVisibleNoInit etc.)
included FlatSB.pas in uses list to use the flat scrollbar wrapper in case there is a system not providing flat scrollbars
ShortenString speed improvements
introduced stream version for header
OnCreateDragManager event
EditDelay property
dropmark can now be switched off (voShowDropmark)
tree colors class which unites all customizable colors into one tree property
sort enhancements (auto sort option, sort column, sort direction and sort glyph in header)
new tree states for left, middle and right mouse button presses
VCL drag'n drop is now also possible (left mouse button only)
many minor changes
bug fixes

Versions 1.30 to 1.31 (December 2000 to January 2001)

adjustments for C++ Builder (some type declarations moved)
voSiblingSelectConstraint
full MainColumn implementation, the column containing the tree can now freely be chosen
DragOperations property
AutoExpandDelay
header image list
canvas font change tracking during paint cycles
WM_ENABLE
Tag property for a column
OnAfterCellPaint, OnBeforeCellPaint
item customization reworked, TDrawInfo as well as OnGetDrawInfo is no longer needed
InitNode in DoGetText
BeginDrag is now protected and should no longer be used by applications
many minor changes
bug fixes

Versions 1.22 to 1.29 (November 2000)

many other minor adjustments
OnDragAllowed for selective drag start
edit improvements
VK_MULTIPLY handling
TScreen.HintFont replacement and Rectangle() version for Delphi 4
column options
bug fixes

Version 1.21 (Oktober 2000)

header drag mark improvements
utility images (internal use, e.g. for header drag mark)
node focus change events
column options
collapse/expand animations
hint animations
paint improvements
splitted stream and tree versions
property IsDisabled
bug fixes

Versions 1.17 to 1.20 (September 2000 to Oktober 2000)

single scroll bar properties class
property IsDisabled
separate tree and stream versions
bug fixes

Versions 1.5 to 1.16 (August 2000 to September 2000)

small improvments
InternalAddFromStream, AddFromStream
grid and tree line colors
improved constrained selection
bug fixes

Versions 1.8 to 1.14 (June 2000 to August 2000)

header streaming
header hints
header drag events
node button
wide string streaming support
margins
gridline color
improved drag image handling
generic editing
non-client area clipping
worker thread improvements (for use in DLLs, services etc.)
initial help file and preparation for first public release
hit test for spanned columns
clipboard and drag'n drop improvements
header owner draw
node sorting (merge sort)
bug fixes

Versions 1.6 to 1.7 (May 2000)

initial expand state (ivsExpanded)
node sort
MarkCutCopyNodes
InitChildren, ValidateChildren
improved clipboard handling (WM_CUT, WM_COPY, WM_PASTE and more)
voInitOnSave
overlay images
no width cache anymore, GetMaxRightExtend instead
column resize event
header popup menus, custom draw, dragging, switchable images
new tree states (expanding, collapsing, updating)
header options
auto span coulumns
bug fixes

Version 1.5 (April 2000)

own implementation for scroll bars
background image
improved NC painting
improved hit test
new events and methods (OnNodeCopying, ReinitNode etc.)
generic node edit improved
property vsHasChildren for nodes, properties ChildCount, ChildrenInitialized and HasChildren in tree
header painting improved (is now also double buffered)
node hint improvements
improved/extended column handling (hit test, FocusedColumn, voExtendedFocus, GetNext(Visible)Column, GetPrevious(Visible)Column, improved autoexpand, voAutoSpanColumns)
custom draw (paint cycles introduced: On(Before/After)[Item]Paint)
many other small improvements and bug fixes

Version 1.4 (February 2000 to March 2000)

node editing, IVTEditLink, WM_RELEASEEDITLINK, application defined node editor
streaming, tree virtualization, application driven save and restore nodes
OLE clipboard support
OLE support by the tree to simplify the work the app. must do (ProcessDrop, ProcessOLEData)
switchable OLE formats the tree should provide
tooltips, node hints
GetSortedSelection, GetSortedCutCopySet
improved accessibility like: TopNode, auto expand/collapes on node focuse change, DeleteSelectedNodes, SelectAll, InvertSelection, GetNext(Previous)Sibling
splitted change event into two, one for node focus change and one for structure change (Add, Delete etc.)
disabled nodes, disabled tree, cutted nodes (with proper visual feedback)
column images
hideable columns, columns auto sizing and reordering
normal and static text for captions
general optimizations
application driven help and popup menu
compatibility for Delphi 4
bug fixes

Versions 1.2 to 1.3 (January 2000)

various new navigation functions (GetFirstSelected etc.)
VCL and OLE drag'n drop united (accept only) plus some support routines (e.g. MoveTo, ConvertSubTree)
new options (auto tristate, auto focus etc.), constrained selection
header and columns (plus support functions)
crossed 10.000 code lines boundary on 31. January
bug fixes

Version 1.1 (December 1999)

OLE drag'n drop
check support
multi selection and other optimizations
bug fixes

Version 1.0 (July 1999 to November 1999)

base implementation (buttons, lines, general window handling, base mouse handling)
caching for optimal speed
multi selection
OLE drag'n drop
common tree functions and properties (InvalidateNode, GetNodeData, Visible, Selected, Expanded...)

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