This unit defines TLazDockTree, the default TDockTree for the LCL
TLazDockPages
a notebook in which each page is a TLazDockPage
TLazDockPage
- an entity similar to a TLazDockForm, but forming a page in a notebook of TLazDockPages
TLazDockSplitter
- a splitter used with Lazarus Docking components
TLazDockZone
- a zone for docking in a Lazarus form

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Destroy
- destructor for TLazDockZone; frees subcomponents then calls inherited Destroy
GetCaption
- if there is a child control, returns the caption for that control; else returns the Index of the control as a string value
GetParentControl
- returns the identity of the Parent control if there is one; otherwise returns the Root zone if this is, in fact, the Root, or the Child control
The Splitter to be use to control the docking of this Zone
The Pages (as in a Notebook) included in the dock zone
A Page in the Notebook included in the Dock Zone
TLazDockTree
- a tree of TLazDockZones found in a docked window
UndockControlForDocking
- frees anchors from parent and sibling controls
BreakAnchors
- detach the anchors of all child controls
CreateDockLayoutHelperControls
- creates any splitters and pages needed for the dock layout, including recursive creation for child controls
AnchorDockLayout
- sets up anchors between all docked controls and helper controls
Create
- constructor for TLazDockTree: creates a docking form if required, sets up a dock manager then calls inherited Create
Destroy
- destructor for TLazDockTree: frees the dock site, annuls the Docksite manager, destroys any images then calls inherited Destroy
InsertControl
- undocks AControl and docks it into the tree

InsertControl - undocks AControl and docks it into the tree

    It creates a new TDockZone for AControl and inserts it as a new leaf.
      It automatically changes the tree, so that the parent of the new TDockZone
      will have the Orientation for InsertAt.

      Example 1:

        A newly created TLazDockTree has only a DockSite (TLazDockForm) and a single
        TDockZone - the RootZone, which has as ChildControl the DockSite.

        Visual:
          +-DockSite--+
          |           |
          +-----------+
        Tree of TDockZone:
          RootZone (DockSite,doNoOrient)

      Inserting the first control:  InsertControl(Form1,alLeft,nil);
        Visual:
          +-DockSite---+
          |+--Form1---+|
          ||          ||
          |+----------+|
          +------------+
        Tree of TDockZone:
          RootZone (DockSite,doHorizontal)
           +-Zone2 (Form1,doNoOrient)

      Dock Form2 right of Form1:  InsertControl(Form2,alLeft,Form1);
        Visual:
          +-DockSite----------+
          |+-Form1-+|+-Form2-+|
          ||        ||       ||
          |+-------+|+-------+|
          +-------------------+
        Tree of TDockZone:
          RootZone (DockSite,doHorizontal)
           +-Zone2 (Form1,doNoOrient)
           +-Zone3 (Form2,doNoOrient)

BuildDockLayout
- breaks the current anchors, forms the appropriate helper controls then re-establishes the anchors
FindBorderControls
- makes splitters for all bordering controls along the specified Side
GetAnchorControl
- find a control to anchor the Zone's Side
AutoFreeDockSite
- determines whether the dock site is free
TLazDockForm
- the default DockSite for a TLazDockTree and for TCustomAnchoredDockManager

TLazDockForm - the default DockSite for a TLazDockTree and for TCustomAnchoredDockManager

    Note: There are two docking managers:
          TLazDockTree uses TLazDockZone to allow docking in rows and columns.
          TCustomAnchoredDockManager does not use TLazDockZone and allows arbitrary layouts.

TLazDockPage
- an entity similar to a TLazDockForm, but forming a page in a notebook of TLazDockPages
The DockZone in which this page is located
The PageControl or notebook in which this page is located (its parent)
TLazDockPages
a notebook in which each page is a TLazDockPage
Create
- constructor for TLazDockPages: sets PageClass as TLazDockPage, then calls inherited Create
TCustomTabControl.Create
Page
- an individual TLazDockPage in the notebook, referred by its Index
TLazDockSplitter
- a splitter used with Lazarus Docking components
FreeSubComponents
- frees and nils the local splitter and page/pages components, ready for destroying the control
ResetSizes
- splits available size of Zone between children
PaintDockFrame
- finds the cursor position and paints the dock frame of the specified size on the nominated canvas
DefaultDockGrabberSize
- returns the default size for the dock grabber
AdjustDockRect
- offset one of the borders of control rect in order to get space for frame
RemoveControl
- destroy child zone and all parents if they does not contain anything else, then removes the dock control
PaintSite
- paint bounds for each control and close button (using the supplied handle)
MessageHandler
- checks the state of the mouse and takes the appropriate action: checks whether redraw is needed because of mouse move or change in mouse button status, text needs to be added, etc
DumpLayout
- writes layout of Zone to a file, for debugging purposes etc
Notification
- if the required operation is removal, sets MainControl to nil, then calls inherited Notification
TCustomForm.Notification
UpdateMainControl
- sets MainControl to a new value
MouseUp
- calls inherited MouseUp then finds position and appropriate header
TControl.MouseUp
MouseDown
- performs inherited MouseDpwn, then finds position and appropriate header
TControl.MouseDown
MouseMove
- performs inherited Mousemove, then finds position and appropriate header
TControl.MouseMove
MouseLeave
- performs inherited MouseLeave, and sets the local store of position to indicate absence of the mouse
TControl.MouseLeave
PaintWindow
- calls inherited PaintWindow, then creates new canvas and handle at cursor position, inserts header caption, title and images
TCustomControl.PaintWindow
TrackMouse
- finds position of the mouse, which part of the control it occupies (whether header or main part of control), and state of buttons
Create
- constructor for TLazDocForm: calls inherited Create, then fills in the header
TCustomForm.Create
Destroy
- destructor for TLazDockForm: removes header then calls inherited Destroy
TCustomForm.Destroy
CloseQuery
- calls inherited method, then asks all top level forms if form can close
TCustomForm.CloseQuery
UpdateCaption
- brings caption up-to-date if there have been changes
UpdateMainControlInParents
- make sure all parents recognise the presence of MainControl
FindMainControlCandidate
- finds forms and controls in the docktree heirarchy that could act as the MainControl
FindHeader
- identifies the part of the dock form that is the header, and returns a TControl
InsertControl
- calls inherited method then updates the main control
TWinControl.InsertControl
IsDockedControl
- checks if control is a child, not a TLazDockSplitter and properly anchor docked; returns True if OK
ControlHasTitle
- returns True if nominated control is visible, is a docked control and has a border spacing greter than zero
GetTitleRect
- returns the coordinates of the title retangle for the nominated control
GetTitleOrientation
- retrns the orientation (horizozntal or vertical) of the title in the nominated control
The identity of the MainControl in the docked form (used for the default caption)
InsertControl
- calls inherited method, then ensures that all parents recognise the MainControl
TWinControl.InsertControl
GetFloatingDockSiteClass
- returns a default class of TLazDockForm, overriding the inherited value
TControl.GetFloatingDockSiteClass
Change
- calls inherited method, then ensures that all parents recognise MainControl
TCustomTabControl.Change
Create
- constructor for TLazDockSplitter: calls inherited Create and initialises minimum size
TCustomSplitter.Create
TLazDockOwnerComponent
- A TComponent owning all automatically created controls of a TCustomAnchoredDockManager, like TLazDockForm
Manager
- the TCustomAnchoredDockManager for this Owner
TCustomAnchoredDockManager
- implements an LCL TDockManager via anchoring

TCustomAnchoredDockManager - implements an LCL TDockManager via anchoring

    It implements docking, undocking, enlarging, shrinking.

        The TCustomLazDockingManager component in LDockCtrl uses this
        docking manager and extends it by layouts that can be stored/restored.

FOwnerComponent
- local variable to hold the TLazDockOwnerComponent for this manager
DeleteSideSplitter
- removes a side splitter to make way for a NewAnchorControl with its anchors
CombineSpiralSplitterPair
- cleans up alignment of two adjacent splitters when they don't line up properly

CombineSpiralSplitterPair - cleans up alignment of two adjacent splitters when they don't line up properly

    {  - Anchor all controls anchored to Splitter2 to Splitter1
       - extend Splitter1
       - delete Splitter2

       Example:

       Four spiral splitters:

         Before:
                  |
               A  |
         ---------|
           | +--+ |  C
         B | |  | |
           | +--+ |
           | ----------
           |   D

         The left and right splitter will be combined to one.

         After:
                  |
               A  |
           -------|
                  |  C
                B |
                  |
                  |------
                  |   D
      }

DeletePage
- removes the specified page from the notebook
DeletePages
- removes the specified group of pages (notebook) from the Dock Form
DeleteDockForm
- removes the specified dock form
GetAnchorDepth
- returns the number of levels of anchoring associated with the given side of the nominated control
GetPreferredTitlePosition
- returns the most favourable place (top or left side) to put the title of a dock component, given the width and height
TObject.Create
Create
- constructor for TCustomAnchoredDockManager: creates the owner component and initialises splitter size, title height and width
Destroy
- destructor for TCustomAnchoredDockManager: frees and annuls the owner component the calls inherited Destroy
TPersistent.Destroy
BeginUpdate
- starts the update process by incrementing the update count
TDockManager.BeginUpdate
EndUpdate
- ends update process by decreenting the update count
If Update count is zero or less, raises and exception
GetControlBounds
- finds the bounding rectangle of the specified control
TDockManager.GetControlBounds
DisableLayout
- placeholder for a virtual procedure to disable the layout of the specified control
EnableLayout
- placeholder for a virtual procedure to enable the layout of the specified control
DockControl
- docks the specified control with the Drop Control, using the alignment rule specified by InsertAt
UndockControl
- removes a control from a docking form. It breaks all anchors and cleans up.

UndockControl - removes a control from a docking form.

    It breaks all anchors and cleans up.

      The created gap will be tried to fill up.
      It removes TLazDockSplitter, TLazDockPage and TLazDockPages if they are no
      longer needed.

     Examples:

      Search Order:

      1. A TLazDockSplitter dividing only two controls:

         Before:
         |-------------
         | +--+ | +---
         | |  | | | B
         | +--+ | +---
         |-------------

         The splitter will be deleted and the right control will be anchored to the
         left.

         After:
         |-------------
         | +---
         | | B
         | +---
         |-------------

      2. Four spiral splitters:

         Before:
                  |
               A  |
         ---------|
           | +--+ |  C
         B | |  | |
           | +--+ |
           | ----------
           |   D

         The left and right splitter will be combined to one.

         After:
                  |
               A  |
           -------|
                  |  C
                B |
                  |
                  |------
                  |   D

      3. No TLazDockSplitter. Control is the only child of a TLazDockPage
         In this case the page will be deleted.
         If the TLazDockPages has no children left, it is recursively undocked.

      4. No TLazDockSplitter, Control is the only child of a TLazDockForm.
         The TLazDockForm is deleted and the Control is floated.
         This normally means: A form will simply be placed on the desktop, other
         controls will be docked into their DockSite.

      5. Otherwise: this control was not docked.

Raises an exception if the control is already undocked
InsertControl
- calls DockControl to perform insertion
TCustomAnchoredDockManager.DockControl TDockManager.InsertControl
EnlargeControl
- attempts to increase the size of the given control along the specified border, if necessary at the expense of neighbouring controls. If Simulate=true then it will only test if control can be enlarged.
RemoveControl
- calls UndockControl to remove the specified control from the docking heirarchy
TCustomAnchoredDockManager.UndockControl TDockManager.RemoveControl
ReplaceAnchoredControl
- takes away OldControl, puts NewControl in its place, re-establishing all the docking, anchors and alignments
GetSplitterWidth
- returns the value of the width of the splitter needed to control this docking process
GetSplitterHeight
- returns the value of the height of the splitter needed to control this docking processGetSplitterHeight -
SplitterSize
- the size of splitter required for this docking process
TitleWidth
- the width of the title for this docking control
TitleHeight
- the height of the title for this docking cotrol
UpdateTitlePosition
- brings title position up to date, reflecting any pending changes
PaintSite
- (drawing of titles is is actually done by TLazDockForm)
TLazDockForm.PaintWindow TDockManager.PaintSite
MessageHandler
- not implemented
PositionDockRect
- not implemented
ResetBounds
- not implemented
SetReplacingControl
- not implemented
LoadFromStream
- not implemented
SaveToStream
- not implemented
AutoFreeByControl
- always returns False, overriding inherited value
TDockManager.AutoFreeByControl
CreateForm
- makes a form and sets up the dock manager