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|
{
fpGUI - Free Pascal GUI Toolkit
Copyright (C) 2006 - 2011 See the file AUTHORS.txt, included in this
distribution, for details of the copyright.
See the file COPYING.modifiedLGPL, included in this distribution,
for details about redistributing fpGUI.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Description:
Defines a basic Treeview control and Node classes. The treeview
keeps track of the nodes in a double-linked list structure.
Each Node as .prev and .next property pointing to it's neighbours.
}
unit fpg_tree;
{$mode objfpc}{$H+}
{
TODO:
* Lots! :-)
* Columns need to be reworked. We don't want coluns per node levels. Instead
we want a main column covering the tree. Then extra columns for user
text and data.
* Implement event handlers the user can hook into and do custom drawing.
* TfpgTreeNode.HasChildren property is not fully implemented yet. The
property is not update when you do .Append() or .AppendText() calls. It
such cases .Count is prefered.
}
{.$Define Debug}
interface
uses
Classes,
SysUtils,
fpg_base,
fpg_main,
fpg_widget,
fpg_imagelist,
fpg_scrollbar,
fpg_menu;
type
TfpgNodeAttachMode = (naAdd, naAddFirst, naAddChild, naAddChildFirst, naInsert);
PfpgTreeColumnWidth = ^TfpgTreeColumnWidth;
TfpgTreeColumnWidth = record
next: PfpgTreeColumnWidth;
width: word;
end;
// forward declaration
TfpgTreeView = class;
TfpgTreeNode = class;
TfpgTreeNodeFindMethod = procedure(ANode: TfpgTreeNode; var AFound: boolean) of object;
TfpgTreeExpandEvent = procedure(Sender: TObject; ANode: TfpgTreeNode) of object;
TfpgStateImageClickedEvent = procedure(Sender: TObject; ANode: TfpgTreeNode) of object;
TfpgTreeNode = class(TObject)
private
FCollapsed: boolean;
FData: Pointer;
FFirstSubNode: TfpgTreeNode; // the subnodes - for list implementation
FImageIndex: integer;
FInactSelColor: TfpgColor;
FInactSelTextColor: TfpgColor;
FLastSubNode: TfpgTreeNode;
FNext: TfpgTreeNode;
FParent: TfpgTreeNode;
FPrev: TfpgTreeNode;
FSelColor: TfpgColor;
FSelTextColor: TfpgColor;
FStateImageIndex: integer;
FText: TfpgString;
FTextColor: TfpgColor;
FHasChildren: Boolean;
FTree: TfpgTreeView;
procedure SetCollapsed(const AValue: boolean);
procedure SetInactSelColor(const AValue: TfpgColor);
procedure SetInactSelTextColor(const AValue: TfpgColor);
procedure SetParent(const AValue: TfpgTreeNode);
procedure SetSelColor(const AValue: TfpgColor);
procedure SetSelTextColor(const AValue: TfpgColor);
procedure SetText(const AValue: TfpgString);
procedure SetTextColor(const AValue: TfpgColor);
procedure DoRePaint;
procedure SetHasChildren(const AValue: Boolean);
procedure DoTreeCheck(ANode: TfpgTreeNode);
procedure SetStateImageIndex(const AValue: integer);
public
constructor Create;
destructor Destroy; override;
// node related
function AppendText(AText: TfpgString): TfpgTreeNode;
function Count: integer;
function CountRecursive: integer;
function FindSubNode(AText: string; ARecursive: Boolean): TfpgTreeNode; overload;
function FindSubNode(ATreeNodeFindMethod: TfpgTreeNodeFindMethod): TfpgTreeNode; overload;
function FindSubNode(AData: TObject; ARecursive: Boolean): TfpgTreeNode; overload;
function GetMaxDepth: integer;
function GetMaxVisibleDepth: integer;
procedure Append(var ANode: TfpgTreeNode);
procedure Clear; // remove all nodes recursively
procedure Collapse;
procedure Expand;
procedure Remove(var aNode: TfpgTreeNode);
procedure MoveTo(Destination: TfpgTreeNode; Mode: TfpgNodeAttachMode);
procedure UnregisterSubNode(aNode: TfpgTreeNode);
// parent color settings
function ParentInactSelColor: TfpgColor;
function ParentInactSelTextColor: TfpgColor;
function ParentSelColor: TfpgColor;
function ParentSelTextColor: TfpgColor;
function ParentTextColor: TfpgColor;
// general properties
property Collapsed: boolean read FCollapsed write SetCollapsed;
property Data: Pointer read FData write FData;
property FirstSubNode: TfpgTreeNode read FFirstSubNode;
property ImageIndex: integer read FImageIndex write FImageIndex;
property StateImageIndex: integer read FStateImageIndex write SetStateImageIndex;
property LastSubNode: TfpgTreeNode read FLastSubNode;
property Next: TfpgTreeNode read FNext write FNext;
property Parent: TfpgTreeNode read FParent write SetParent;
property Prev: TfpgTreeNode read FPrev write FPrev;
property Text: TfpgString read FText write SetText;
{ determines the + or - image in the treeview }
property HasChildren: Boolean read FHasChildren write SetHasChildren;
// color settings
property InactSelColor: TfpgColor read FInactSelColor write SetInactSelColor;
property InactSelTextColor: TfpgColor read FInactSelTextColor write SetInactSelTextColor;
property SelColor: TfpgColor read FSelColor write SetSelColor;
property SelTextColor: TfpgColor read FSelTextColor write SetSelTextColor;
property TextColor: TfpgColor read FTextColor write SetTextColor;
end;
TfpgTreeView = class(TfpgWidget)
private
FImageList: TfpgImageList;
FStateImageList: TfpgImageList;
FColumnHeight: integer; // height of the column header
FDefaultColumnWidth: word;
FIndentNodeWithNoImage: boolean;
FFirstColumn: PfpgTreeColumnWidth; // the list for column widths
FFont: TfpgFont;
FHScrollbar: TfpgScrollbar;
FMoving: boolean;
FMovingCol: integer;
FMovingPos: integer;
FNoImageIndent: integer;
FOnChange: TNotifyEvent;
FOnExpand: TfpgTreeExpandEvent;
FOnStateImageClicked: TfpgStateImageClickedEvent;
FRootNode: TfpgTreeNode;
FScrollWheelDelta: integer;
FSelection: TfpgTreeNode; // currently selected node
FShowColumns: boolean;
FShowImages : boolean;
FTreeLineColor: TfpgColor;
FTreeLineStyle: TfpgLineStyle;
FVScrollbar: TfpgScrollbar;
FXOffset: integer; // for repaint and scrollbar-calculation
FYOffset: integer;
FUpdateCount: integer;
function GetFontDesc: string;
function GetRootNode: TfpgTreeNode;
procedure SetDefaultColumnWidth(const AValue: word);
procedure SetFontDesc(const AValue: string);
procedure SetSelection(const AValue: TfpgTreeNode);
procedure SetShowColumns(const AValue: boolean);
procedure SetShowImages(const AValue: boolean);
procedure SetTreeLineColor(const AValue: TfpgColor);
procedure SetTreeLineStyle(const AValue: TfpgLineStyle);
procedure SetIndentNodeWithNoImage(const AValue: boolean);
function VisibleWidth: integer;
function VisibleHeight: integer;
function GetNodeHeightSum: integer;
function MaxNodeWidth: integer;
function GetNodeHeight: integer;
// width of a node inclusive of image and state image
function GetNodeWidth(ANode: TfpgTreeNode): integer;
function NodeIsVisible(ANode: TfpgTreeNode): boolean;
// returns the node-top in pixels
function GetAbsoluteNodeTop(ANode: TfpgTreeNode): integer;
function GetColumnLeft(AIndex: integer): integer;
procedure PreCalcColumnLeft;
procedure VScrollbarScroll(Sender: TObject; position: integer);
procedure HScrollbarScroll(Sender: TObject; position: integer);
procedure UpdateScrollbars;
procedure ResetScrollbar;
procedure ClearColumnLeft;
procedure FreeAllTreeNodes;
protected
FColumnLeft: TList;
FPopupMenu: TfpgPopupMenu;
procedure HandleResize(awidth, aheight: TfpgCoord); override;
procedure HandleLMouseUp(x, y: integer; shiftstate: TShiftState); override;
procedure HandleLMouseDown(x, y: integer; shiftstate: TShiftState); override;
procedure HandleRMouseUp(x, y: integer; shiftstate: TShiftState); override;
procedure HandleDoubleClick(x, y: integer; button: word; shiftstate: TShiftState); override;
procedure HandleKeyPress(var keycode: word; var shiftstate: TShiftState; var consumed: boolean); override;
procedure HandleMouseScroll(x, y: integer; shiftstate: TShiftState; delta: smallint); override;
procedure HandleShow; override;
procedure HandlePaint; override;
procedure DrawHeader(ACol: integer; ARect: TfpgRect; AFlags: integer); virtual;
procedure DoChange; virtual;
procedure DoExpand(ANode: TfpgTreeNode); virtual;
// the nodes between the given node and the direct next node
function SpaceToVisibleNext(aNode: TfpgTreeNode): integer;
function StepToRoot(aNode: TfpgTreeNode): integer;
procedure RePaint; override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure SetColumnWidth(AIndex, AWidth: word);
// the width of a column - aIndex of the rootnode = 0
function GetColumnWidth(AIndex: word): word;
procedure GotoNextNodeUp;
procedure GotoNextNodeDown;
procedure FullCollapse;
procedure FullExpand;
// any next node, even if node is collapsed
function NextNode(ANode: TfpgTreeNode): TfpgTreeNode;
function PrevNode(ANode: TfpgTreeNode): TfpgTreeNode;
// only visual (visible) nodes
function NextVisualNode(ANode: TfpgTreeNode): TfpgTreeNode;
function PrevVisualNode(ANode: TfpgTreeNode): TfpgTreeNode;
procedure BeginUpdate;
procedure EndUpdate;
property Font: TfpgFont read FFont;
// Invisible node that starts the tree
property RootNode: TfpgTreeNode read GetRootNode;
property Selection: TfpgTreeNode read FSelection write SetSelection;
property ImageList: TfpgImageList read FImageList write FImageList;
property StateImageList: TfpgImageList read FStateImageList write FStateImageList;
property PopupMenu: TfpgPopupMenu read FPopupMenu write FPopupMenu;
published
property Align;
property BackgroundColor default clListBox;
property DefaultColumnWidth: word read FDefaultColumnWidth write SetDefaultColumnWidth default 15;
property Enabled;
property FontDesc: string read GetFontDesc write SetFontDesc;
property IndentNodeWithNoImage: boolean read FIndentNodeWithNoImage write SetIndentNodeWithNoImage default True;
property NoImageIndent: integer read FNoImageIndent write FNoImageIndent default 16;
property ParentShowHint;
property ScrollWheelDelta: integer read FScrollWheelDelta write FScrollWheelDelta default 15;
property ShowColumns: boolean read FShowColumns write SetShowColumns default False;
property Hint;
property ShowHint;
property ShowImages: boolean read FShowImages write SetShowImages default False;
property TabOrder;
property TextColor;
property TreeLineColor: TfpgColor read FTreeLineColor write SetTreeLineColor default clShadow1;
property TreeLineStyle: TfpgLineStyle read FTreeLineStyle write SetTreeLineStyle default lsDot;
property OnChange: TNotifyEvent read FOnChange write FOnChange;
property OnExpand: TfpgTreeExpandEvent read FOnExpand write FOnExpand;
property OnDoubleClick;
property OnShowHint;
property OnStateImageClicked: TfpgStateImageClickedEvent read FOnStateImageClicked write FOnStateImageClicked;
end;
implementation
{.$IFDEF DEBUG}
uses
dbugintf;
{.$ENDIF}
type
PColumnLeft = ^integer;
{ TfpgTreeNode }
procedure TfpgTreeNode.SetInactSelColor(const AValue: TfpgColor);
begin
if AValue <> FInactSelColor then
begin
FInactSelColor := AValue;
DoRePaint;
end;
end;
procedure TfpgTreeNode.SetCollapsed(const AValue: boolean);
begin
if aValue <> FCollapsed then
begin
FCollapsed := AValue;
DoRePaint;
end;
end;
procedure TfpgTreeNode.SetInactSelTextColor(const AValue: TfpgColor);
begin
if AValue <> FInactSelTextColor then
begin
FInactSelTextColor := AValue;
DoRePaint;
end;
end;
procedure TfpgTreeNode.SetParent(const AValue: TfpgTreeNode);
begin
if aValue <> FParent then
begin
if FParent <> nil then
FParent.UnRegisterSubNode(self); // unregisteres
FParent := aValue;
if FParent <> nil then
begin
DoRePaint;
end;
end;
end;
procedure TfpgTreeNode.SetSelColor(const AValue: TfpgColor);
begin
if FSelColor <> aValue then
begin
FSelColor := aValue;
DoRePaint;
end;
end;
procedure TfpgTreeNode.SetSelTextColor(const AValue: TfpgColor);
begin
if FTextColor <> aValue then
begin
FSelTextColor := aValue;
DoRePaint;
end;
end;
procedure TfpgTreeNode.SetText(const AValue: TfpgString);
begin
if AValue <> FText then
begin
FText := aValue;
DoRePaint;
end;
end;
procedure TfpgTreeNode.SetTextColor(const AValue: TfpgColor);
begin
if FTextColor <> aValue then
begin
FTextColor := aValue;
DoRePaint;
end;
end;
procedure TfpgTreeNode.DoRePaint;
begin
// FTree.Invalidate;
end;
procedure TfpgTreeNode.SetHasChildren(const AValue: Boolean);
begin
if FHasChildren <> AValue then
begin
FHasChildren := AValue;
DoRePaint;
end;
end;
procedure TfpgTreeNode.DoTreeCheck(ANode: TfpgTreeNode);
begin
if ANode.FTree <> FTree then
raise Exception.Create('Nodes must be of the same tree');
end;
procedure TfpgTreeNode.SetStateImageIndex(const AValue: integer);
begin
if FStateImageIndex = AValue then
exit;
FStateImageIndex := AValue;
DoRepaint;
end;
constructor TfpgTreeNode.Create;
begin
FData := nil;
FFirstSubNode := nil;
FLastSubNode := nil;
FText := '';
FImageIndex := -1;
FStateImageIndex := -1;
FCollapsed := True;
FHasChildren := False;
FParent := nil;
FNext := nil;
FPrev := nil;
FSelColor := clUnset;
FSelTextColor := clUnset;
FTextColor := clUnset;
FInactSelColor := clUnset;
FInactSelTextColor := clUnset;
end;
destructor TfpgTreeNode.Destroy;
begin
if FParent <> nil then
FParent.UnregisterSubNode(self);
Clear;
FData := nil;
FParent := nil;
FNext := nil;
FPrev := nil;
FFirstSubNode := nil;
FLastSubNode := nil;
inherited Destroy;
end;
procedure TfpgTreeNode.UnregisterSubNode(aNode: TfpgTreeNode);
var
h: TfpgTreeNode;
begin
h := FFirstSubNode;
while h <> nil do
begin
if h = aNode then
begin
if h = FFirstSubNode then
FFirstSubNode := FFirstSubNode.Next;
if h = FLastSubNode then
FLastSubNode := FLastSubNode.Prev;
if h.prev <> nil then
h.prev.next := h.next;
if h.next <> nil then
h.next.prev := h.prev;
exit;
end;
h := h.next;
end;
end;
procedure TfpgTreeNode.Append(var ANode: TfpgTreeNode);
begin
DoTreeCheck(ANode);
ANode.Parent := self;
ANode.Next := nil;
if FFirstSubNode = nil then
FFirstSubNode := ANode;
ANode.Prev := FLastSubNode;
if FLastSubNode <> nil then
FLastSubNode.Next := ANode;
FLastSubNode := ANode;
FHasChildren := True;
end;
function TfpgTreeNode.FindSubNode(AText: string; ARecursive: Boolean): TfpgTreeNode;
var
h: TfpgTreeNode;
begin
result := nil;
if ARecursive then
begin
h := FirstSubNode;
while h <> nil do
begin
if h.Text = AText then
begin
result := h;
Exit; //==>
end;
if h.count > 0 then
begin
result := h.FindSubNode(AText, ARecursive);
if result <> nil then
Exit; //==>
end;
h := h.next;
end; { while }
end
else
begin
h := FirstSubNode;
while h <> nil do
begin
if h.Text = AText then
begin
result := h;
break;
end;
h := h.next;
end;
end; { if/else }
end;
function TfpgTreeNode.FindSubNode(ATreeNodeFindMethod: TfpgTreeNodeFindMethod): TfpgTreeNode;
var
lFound: Boolean;
h: TfpgTreeNode;
begin
result := nil;
lFound := False;
if not Assigned(ATreeNodeFindMethod) then
Exit; //==>
h := FirstSubNode;
while h <> nil do
begin
ATreeNodeFindMethod(h, lFound);
if lFound then
begin
result := h;
Exit; //==>
end;
if h.Count > 0 then
begin
result := h.FindSubNode(ATreeNodeFindMethod);
if result <> nil then
Exit; //==>
end;
h := h.next;
end;
end;
function TfpgTreeNode.FindSubNode(AData: TObject; ARecursive: Boolean): TfpgTreeNode;
var
h: TfpgTreeNode;
begin
result := nil;
if ARecursive then
begin
h := FirstSubNode;
while h <> nil do
begin
if TObject(h.Data) = AData then
begin
result := h;
Exit; //==>
end;
if h.count > 0 then
begin
result := h.FindSubNode(AData, ARecursive);
if result <> nil then
Exit; //==>
end;
h := h.next;
end; { while }
end
else
begin
h := FirstSubNode;
while h <> nil do
begin
if TObject(h.Data) = AData then
begin
result := h;
break;
end;
h := h.next;
end;
end; { if/else }
end;
function TfpgTreeNode.AppendText(AText: TfpgString): TfpgTreeNode;
var
h: TfpgTreeNode;
begin
{$IFDEF DEBUG}
SendDebug(Classname + '.AppendText');
{$ENDIF}
h := TfpgTreeNode.Create;
h.FTree := FTree;
h.Text := AText;
Append(h);
result := h;
end;
function TfpgTreeNode.GetMaxDepth: integer;
var
h: TfpgTreeNode;
a: integer;
t: integer;
begin
{$IFDEF DEBUG}
SendDebug(Classname + '.GetMaxDepth');
{$ENDIF}
h := FirstSubNode;
result := 1;
a := 0;
while h <> nil do
begin
t := h.GetMaxDepth;
if t > a then
a := t;
h := h.next;
end;
result := result + a;
end;
function TfpgTreeNode.GetMaxVisibleDepth: integer;
var
h: TfpgTreeNode;
a: integer;
t: integer;
begin
{$IFDEF DEBUG}
SendDebug(Classname + '.GetMaxVisibleDepth');
{$ENDIF}
result := 1;
h := FirstSubNode;
if h.Collapsed then
exit;
a := 0;
while h <> nil do
begin
t := h.GetMaxDepth;
if t > a then
a := t;
h := h.next;
end;
result := result + a;
end;
procedure TfpgTreeNode.Collapse;
begin
Collapsed := True;
end;
procedure TfpgTreeNode.Expand;
begin
Collapsed := False;
end;
function TfpgTreeNode.Count: integer;
var
h: TfpgTreeNode;
i: integer;
begin
h := FirstSubNode;
i := 0;
while h <> nil do
begin
inc(i);
h := h.next;
end;
result := i;
end;
function TfpgTreeNode.CountRecursive: integer;
var
h: TfpgTreeNode;
i: integer;
begin
h := FFirstSubNode;
i := 0;
while h <> nil do
begin
inc(i); // current node
i := i + h.CountRecursive; // increases i by the count of the subnodes of the subnode
h := h.next;
end;
result := i;
end;
procedure TfpgTreeNode.Remove(var aNode: TfpgTreeNode);
begin
if FirstSubNode = aNode then
begin
FFirstSubNode := aNode.next;
if FFirstSubNode <> nil then
FFirstSubNode.Prev := nil;
end
else
begin
if aNode.prev <> nil then
aNode.Prev.next := aNode.next;
end;
if LastSubNode = aNode then
begin
FLastSubNode := aNode.prev;
if FLastSubNode <> nil then
FLastSubNode.next := nil;
end
else
begin
if aNode.next <> nil then
aNode.next.prev := aNode.prev;
end;
aNode.prev := nil;
aNode.next := nil;
aNode.parent := nil;
end;
procedure TfpgTreeNode.MoveTo(Destination: TfpgTreeNode; Mode: TfpgNodeAttachMode);
begin
if Destination = nil then
Exit;
DoTreeCheck(Destination);
Parent.Remove(self);
case Mode of
naAdd:
begin
Destination.Parent.Append(self);
end;
naAddFirst:
begin
Next := Destination.Parent.FirstSubNode;
Next.Prev := self;
Destination.Parent.FFirstSubNode := self;
Parent := Destination.Parent;
end;
naAddChild:
begin
Destination.Append(self);
end;
naAddChildFirst:
begin
Next := Destination.FirstSubNode;
if Assigned(Destination.FirstSubNode) then
Destination.FirstSubNode.Prev := self;
Destination.FFirstSubNode := self;
Parent := Destination;
if Destination.LastSubNode = nil then
Destination.FLastSubNode := self;
end;
naInsert:
begin
Prev := Destination.Prev;
Next := Destination;
Parent := Destination.Parent;
Destination.Prev := self;
if Prev = nil then
Parent.FFirstSubNode := self
else
Prev.Next := self;
end;
end; { case }
end;
procedure TfpgTreeNode.Clear;
var
n: TfpgTreeNode;
tn: TfpgTreeNode;
begin
n := LastSubNode;
while n <> nil do
begin
tn := n;
n := n.prev;
Remove(tn);
tn.Free;
end;
FHasChildren := False;
end;
function TfpgTreeNode.ParentTextColor: TfpgColor;
begin
if TextColor <> clUnset then
result := TextColor
else
begin
if parent <> nil then
result := parent.ParentTextColor
else
result := clText1;
end;
end;
function TfpgTreeNode.ParentSelTextColor: TfpgColor;
begin
if SelTextColor <> clUnset then
result := SelTextColor
else
begin
if parent <> nil then
result := parent.ParentSelTextColor
else
result := clSelectionText;
end;
end;
function TfpgTreeNode.ParentSelColor: TfpgColor;
begin
if SelColor <> clUnset then
result := SelColor
else
begin
if parent <> nil then
result := parent.ParentSelColor
else
result := clSelection;
end;
end;
function TfpgTreeNode.ParentInactSelTextColor: TfpgColor;
begin
if InactSelTextColor <> clUnset then
result := InactSelTextColor
else
begin
if Parent <> nil then
Result := Parent.ParentInactSelTextColor
else
Result := clInactiveSelText;
end;
end;
function TfpgTreeNode.ParentInactSelColor: TfpgColor;
begin
if InactSelColor <> clUnset then
result := InactSelColor
else
begin
if Parent <> nil then
result := parent.ParentInactSelColor
else
result := clInactiveSel;
end;
end;
{ TfpgTreeview }
procedure TfpgTreeview.VScrollbarScroll(Sender: TObject; position: integer);
begin
{$IFDEF DEBUG}
SendDebug(Classname + '.VScrollbarMove');
{$ENDIF}
FYOffset := Position;
RePaint;
end;
function TfpgTreeview.GetFontDesc: string;
begin
Result := FFont.FontDesc;
end;
function TfpgTreeview.GetRootNode: TfpgTreeNode;
begin
if FRootNode = nil then
begin
FRootNode := TfpgTreeNode.Create;
FRootNode.FTree := self;
end;
FRootNode.TextColor := clText1;
FRootnode.SelTextColor := clSelectionText;
FRootnode.SelColor := clSelection;
Result := FRootNode;
end;
procedure TfpgTreeview.SetDefaultColumnWidth(const AValue: word);
begin
if (aValue <> FDefaultColumnWidth) and (aValue > 3) then
begin
FDefaultColumnWidth := AValue;
RePaint;
end;
end;
procedure TfpgTreeview.SetFontDesc(const AValue: string);
begin
FFont.Free;
FFont := fpgGetFont(AValue);
RePaint;
end;
procedure TfpgTreeview.SetSelection(const AValue: TfpgTreeNode);
var
n: TfpgTreeNode;
dy: integer; // y delta - absolute top node
nh: integer; // node height
vh: integer; // visible height
begin
if AValue <> FSelection then
begin
FSelection := AValue;
if AValue <> nil then
begin
n := AValue.Parent;
while n <> nil do
begin
if n.Collapsed then
begin
n.Expand;
DoExpand(n);
end;
n := n.parent;
end;
UpdateScrollbars;
end;
dy := GetAbsoluteNodeTop(FSelection);
nh := GetNodeHeight;
vh := VisibleHeight;
if dy + nh - FVScrollbar.Position > vh then
begin
if FVScrollBar.Max = 0 then // the first time and no expansion happened before.
FVScrollBar.Max := dy + Height;
FVScrollbar.Position := dy + nh - (vh div 2);
FYOffset := FVScrollbar.Position;
UpdateScrollBars;
if FHScrollbar.Visible then // HScrollbar appeared so we need to adjust position again
begin
FVScrollbar.Position := FVScrollbar.Position + FHScrollbar.Height;
FYOffset := FVScrollbar.Position;
UpdateScrollBars;
end;
end;
if dy - FVScrollbar.Position < 0 then
begin
FVScrollbar.Position := dy;
FYOffset := FVScrollbar.Position;
UpdateScrollbars;
end;
end;
end;
procedure TfpgTreeview.SetShowColumns(const AValue: boolean);
begin
if FShowColumns <> aValue then
begin
FShowColumns := aValue;
RePaint;
end;
end;
procedure TfpgTreeview.SetShowImages(const AValue: boolean);
begin
if AValue <> FShowImages then
begin
FShowImages := AValue;
UpdateScrollbars;
RePaint;
end;
end;
procedure TfpgTreeview.SetTreeLineColor(const AValue: TfpgColor);
begin
if FTreeLineColor = AValue then
Exit; //==>
FTreeLineColor := AValue;
RePaint;
end;
procedure TfpgTreeview.SetTreeLineStyle(const AValue: TfpgLineStyle);
begin
if FTreeLineStyle = AValue then
Exit; //==>
FTreeLineStyle := AValue;
RePaint;
end;
procedure TfpgTreeView.SetIndentNodeWithNoImage(const AValue: boolean);
begin
if AValue <> FIndentNodeWithNoImage then
begin
FIndentNodeWithNoImage := AValue;
UpdateScrollbars;
RePaint;
end;
end;
function TfpgTreeview.VisibleWidth: integer;
begin
Result := Width - 2; // border width = 2 pixels
if FVScrollbar.Visible then
dec(Result, FVScrollbar.Width);
end;
function TfpgTreeview.VisibleHeight: integer;
begin
Result := Height - 2; // border width = 2 pixels
if FShowColumns then
dec(Result, FColumnHeight);
if FHScrollbar.Visible then
dec(Result, FHScrollbar.Height);
end;
function TfpgTreeview.GetNodeHeightSum: integer;
var
h: TfpgTreeNode;
i: integer;
begin
h := RootNode;
i := -1;
while h <> nil do
begin
inc(i);
if (not h.Collapsed) and (h.Count > 0) then
begin
h := h.FirstSubNode;
end
else
begin
if h.next <> nil then
h := h.next
else
begin
while h.next = nil do
begin
h := h.parent;
if h = nil then
begin
result := i;
exit;
end;
end;
h := h.next;
end;
end;
end;
result := i;
end;
function TfpgTreeview.MaxNodeWidth: integer;
var
h: TfpgTreeNode;
w: integer;
r: integer;
begin
{$IFDEF DEBUG}
SendDebug(Classname + '.MaxNodeWidth');
{$ENDIF}
result := 0;
h := RootNode.FirstSubNode;
r := 0;
while h <> nil do
begin
w := GetColumnLeft(StepToRoot(h));
if r < w + GetNodeWidth(h) then
r := w + GetNodeWidth(h);
if (not h.collapsed) and (h.count > 0) then
h := h.FirstSubNode
else
begin
if h.next <> nil then
h := h.next
else
begin
while h.next = nil do
begin
h := h.parent;
if h = nil then
begin
result := r + 4;
exit;
end;
end; { while }
h := h.next;
end;
end; { if/else }
end; { while }
end;
function TfpgTreeview.GetNodeHeight: integer;
begin
Result := FFont.Height + 2;
end;
function TfpgTreeview.GetNodeWidth(ANode: TfpgTreeNode): integer;
var
lImageItem: TfpgImageItem;
begin
{$IFDEF DEBUG}
SendDebug(Classname + '.GetNodeWidth');
{$ENDIF}
if ANode = nil then
Result := 0
else
begin
Result := FFont.TextWidth(ANode.Text) + 4;
if ShowImages and ((ImageList <> nil) or (StateImageList <> nil)) then
begin
if ImageList <> nil then
begin
if ANode.ImageIndex > -1 then
begin
lImageItem := ImageList.Items[ANode.ImageIndex];
if lImageItem <> nil then
result += lImageItem.Image.Width + 2;
end
else if IndentNodeWithNoImage then
result += NoImageIndent + 2;
end
else if IndentNodeWithNoImage then
result += NoImageIndent + 2;
if StateImageList <> nil then
begin
if ANode.StateImageIndex > -1 then
begin
lImageItem := StateImageList.Items[ANode.StateImageIndex];
if lImageItem <> nil then
result += lImageItem.Image.Width + 2;
end
else if IndentNodeWithNoImage then
result += NoImageIndent + 2;
end;
end;
end; { if/else }
end;
function TfpgTreeview.NodeIsVisible(ANode: TfpgTreeNode): boolean;
begin
Result := True;
if ANode = nil then
begin
Result := False;
exit;
end;
ANode := ANode.Parent;
while ANode <> nil do
begin
if ANode.Collapsed and (ANode.Parent <> nil) then
Result := False;
ANode := ANode.Parent;
end;
end;
function TfpgTreeview.GetAbsoluteNodeTop(ANode: TfpgTreeNode): integer;
var
i: integer;
begin
i := 0;
while (ANode <> nil) and (ANode <> RootNode) do
begin
ANode := PrevVisualNode(ANode);
inc(i);
end;
result := (i - 1) * GetNodeHeight;
end;
function TfpgTreeview.GetColumnLeft(AIndex: integer): integer;
begin
if FColumnLeft = nil then
PreCalcColumnLeft;
if AIndex < 0 then
Result := 0
else
begin
if AIndex > FColumnLeft.Count - 1 then
result := PColumnLeft(FColumnLeft[FColumnLeft.Count - 1])^
else
result := PColumnLeft(FColumnLeft[AIndex])^;
end;
end;
function TfpgTreeview.GetColumnWidth(AIndex: word): word;
var
h: PfpgTreeColumnWidth;
i: integer;
begin
{$IFDEF DEBUG}
SendDebug(Classname + '.GetColumnWidth');
{$ENDIF}
h := FFirstColumn;
i := 0;
if h = nil then // not found
begin
result := DefaultColumnWidth;
exit;
end;
while i < aIndex do
begin
if h = nil then // not found - returns the default
begin
result := DefaultColumnWidth;
exit;
end;
h := h^.next;
inc(i);
end;
if h <> nil then
result := h^.width
else // not found -> returns the default
result := DefaultColumnWidth;
end;
procedure TfpgTreeView.GotoNextNodeUp;
begin
if Selection = RootNode.FirstSubNode then
Exit;
Selection := PrevNode(Selection);
end;
procedure TfpgTreeView.GotoNextNodeDown;
var
lNode: TfpgTreeNode;
begin
if (Selection = RootNode.LastSubNode) and (RootNode.LastSubNode.CountRecursive = 0) then
Exit;
lNode := NextNode(Selection);
if lNode <> nil then
Selection := lNode;
end;
procedure TfpgTreeView.FullCollapse;
var
n: TfpgTreeNode;
begin
n := NextNode(RootNode);
repeat
if n <> nil then
begin
n.Collapse;
end;
n := NextNode(n);
until n = nil;
Repaint;
end;
procedure TfpgTreeView.FullExpand;
var
n: TfpgTreeNode;
begin
n := NextNode(RootNode);
repeat
if n <> nil then
begin
n.Expand;
end;
n := NextNode(n);
until n = nil;
Repaint;
end;
procedure TfpgTreeview.PreCalcColumnLeft;
var
Aleft: TfpgCoord;
ACounter: integer;
AColumnLeft: PColumnLeft;
begin
{$IFDEF DEBUG}
SendDebug(Classname + '.PreCalcColumnLeft');
{$ENDIf}
if FColumnLeft = nil then
FColumnLeft := TList.Create;
ClearColumnLeft; // Freeing memory
Aleft := 0;
for ACounter := 1 to RootNode.GetMaxDepth do
begin
AColumnLeft := new(PColumnLeft);
AColumnLeft^ := Aleft;
FColumnLeft.Add(AColumnLeft);
Aleft := Aleft + GetColumnWidth(ACounter);
end;
end;
procedure TfpgTreeview.HScrollbarScroll(Sender: TObject; position: integer);
begin
FXOffset := Position;
RePaint;
end;
procedure TfpgTreeview.UpdateScrollbars;
begin
{$IFDEF DEBUG}
SendDebug(Classname + '.UpdateScrollbars');
{$ENDIF}
FVScrollbar.Visible := VisibleHeight < (GetNodeHeightSum * GetNodeHeight);
FVScrollbar.Min := 0;
FVScrollbar.Max := (GetNodeHeightSum * GetNodeHeight) - VisibleHeight + FHScrollbar.Height;
FVScrollbar.PageSize := (VisibleHeight div 4) * 3; // three quarters of the height
FVScrollbar.ScrollStep := GetNodeHeight; // up/down buttons move the height of the font
FHScrollbar.Min := 0;
FHScrollbar.Max := MaxNodeWidth - VisibleWidth + FVScrollbar.Width;
FHScrollbar.PageSize := (VisibleWidth div 4) * 3; // three quarters of the height
FHScrollbar.Visible := MaxNodeWidth > Width - 2;
if not FVScrollbar.Visible then
begin
FVScrollbar.Position := 0;
FVScrollBar.RepaintSlider;
FYOffset := 0;
end
else
FVScrollBar.RepaintSlider;
if not FHScrollbar.Visible then
begin
FHScrollbar.Position := 0;
FHScrollBar.RepaintSlider;
FXOffset := 0;
end
else
FHScrollBar.RepaintSlider;
end;
procedure TfpgTreeview.ResetScrollbar;
begin
{$IFDEF DEBUG}
SendDebug(Classname + '.ResetScrollbar');
{$ENDIF}
UpdateScrollBars;
if FHScrollbar.Visible then
FVScrollbar.SetPosition(Width - 19, 1, 18, Height - 2 - 18)
else
FVScrollbar.SetPosition(Width - 19, 1, 18, Height - 2);
FHScrollbar.SetPosition(1, Height - 19, Width - 2, 18);
end;
procedure TfpgTreeView.ClearColumnLeft;
var
i: integer;
AColumnLeft: PColumnLeft;
begin
for i := 0 to FColumnLeft.Count - 1 do // Freeing Memory
begin
AColumnLeft := FColumnLeft[i];
Dispose(AColumnLeft);
end;
FColumnLeft.Clear;
end;
procedure TfpgTreeView.FreeAllTreeNodes;
begin
RootNode.Clear;
end;
procedure TfpgTreeview.HandleResize(awidth, aheight: TfpgCoord);
begin
{$IFDEF DEBUG}
SendDebug(Classname + '.HandleResize');
{$ENDIF}
inherited HandleResize(awidth, aheight);
if (csLoading in ComponentState) then
Exit; //==>
if csUpdating in ComponentState then
Exit; //==>
if not (csLoading in ComponentState) then
ResetScrollbar;
RePaint;
end;
procedure TfpgTreeview.HandleLMouseUp(x, y: integer; shiftstate: TShiftState);
var
col: integer;
i: integer;
w: integer;
i1: integer;
last: TfpgTreeNode;
node: TfpgTreeNode;
cancel: boolean;
OldSel: TfpgTreeNode;
lNodeXOffset: integer;
begin
inherited HandleLMouseUp(x, y, shiftstate);
node := nil;
OldSel := Selection;
if FMoving then // column resize
begin
FMoving := false;
x := x + FXOffset;
SetColumnWidth(FMovingCol, GetColumnWidth(FMovingCol) + x - FMovingPos);
FMoving := false;
end
else
begin
if ShowColumns then
col := FColumnHeight
else
col := 0;
y := y - col - 1 + FYOffset;
i := 0;
x := x + FXOffset;
cancel := False;
last := RootNode;
while not ((((i - 1) * GetNodeHeight) <= y) and ((i * GetNodeHeight) >= y)) do
begin
node := NextVisualNode(last);
if node = nil then
exit; //==>
if node = last then
begin
cancel := True;
break; //==>
end;
inc(i);
last := node;
end;
if (not cancel) or (node <> nil) then
begin
// +/- or node-selection?
i1 := StepToRoot(node);
w := GetColumnLeft(i1);
if (x >= w - GetColumnWidth(i1) div 2 - 3) and (x <= w - GetColumnWidth(i1) div 2 + 6) then
// collapse or expand?
begin // yes
if (node.Count > 0) or node.HasChildren then
begin
if node.Collapsed then
begin
node.expand;
DoExpand(node);
end
else
node.Collapse;
ResetScrollBar;
RePaint;
end;
end
else
begin
lNodeXOffset := w - GetColumnWidth(i1) div 2 + 6;
if x > lNodeXOffset then { we clicked in the actual treenode area }
begin
Selection := node;
if (StateImageList <> nil) and ShowImages then
begin
{ did we click on the state image }
if (x > lNodeXOffset) and (x < (lNodeXOffset+18)) then
begin
if Assigned(OnStateImageClicked) then
FOnStateImageClicked(self, node);
end;
end;
end;
end;
end;
end;
if OldSel <> Selection then
begin
RePaint;
DoChange;
end;
end;
procedure TfpgTreeview.HandleLMouseDown(x, y: integer; shiftstate: TShiftState);
var
xpos: integer;
i: integer;
begin
inherited HandleLMouseDown(x, y, shiftstate);
if ShowColumns then
begin
x := x + FXOffset;
xpos := 0;
i := 0;
while xpos + 2 < x do
begin
inc(i);
xpos := xpos + GetColumnWidth(i);
end;
if (x > xpos - 2) and (x < xpos + 2) then
begin
FMoving := True;
FMovingPos := xpos;
FMovingCol := i;
SetColumnWidth(i, GetColumnWidth(i));
end;
end;
RePaint;
end;
procedure TfpgTreeView.HandleRMouseUp(x, y: integer; shiftstate: TShiftState);
begin
inherited HandleRMouseUp(x, y, shiftstate);
if Assigned(PopupMenu) then
PopupMenu.ShowAt(self, x, y);
end;
procedure TfpgTreeview.HandleDoubleClick(x, y: integer; button: word;
shiftstate: TShiftState);
begin
// to setup cursor co-ordinates and handle selection
HandleLMouseUp(x, y, shiftstate);
inherited HandleDoubleClick(x, y, button, shiftstate);
if Selection <> nil then
begin
if Selection.Collapsed then
begin
Selection.Expand;
DoExpand(Selection);
end
else
Selection.Collapse;
RePaint;
end;
end;
procedure TfpgTreeview.HandleShow;
begin
if (csLoading in ComponentState) then
Exit;
if not (csLoading in ComponentState) then
ResetScrollbar;
inherited HandleShow;
end;
procedure TfpgTreeview.HandlePaint;
var
r: TfpgRect;
h: TfpgTreeNode;
i: integer;
i1: integer;
w: integer;
YPos: integer;
col: integer;
ACenterPos: integer;
x: integer;
imgx: integer;
y: integer;
AImageItem: TfpgImageItem;
AVisibleHeight: integer;
begin
{$IFDEF DEBUG}
SendDebug(Classname + '.HandlePaint');
{$ENDIF}
if csUpdating in ComponentState then
Exit;
// inherited HandlePaint;
Canvas.ClearClipRect;
Canvas.Clear(BackgroundColor);
// Limit painting in the UI Designer
if csDesigning in ComponentState then
begin
Canvas.SetColor(clInactiveWgFrame);
r.SetRect(0, 0, Width, Height);
Canvas.DrawRectangle(r);
Canvas.SetTextColor(clInactiveWgFrame);
Canvas.DrawString(2, 2, Name + ': ' + Classname);
Exit;
end;
if FFocused then
Canvas.SetColor(clWidgetFrame)
else
Canvas.SetColor(clInactiveWgFrame);
r.SetRect(0, 0, Width, Height);
Canvas.DrawRectangle(r); // border
i1 := 0;
PreCalcColumnLeft;
UpdateScrollbars;
AVisibleHeight := VisibleHeight;
// if not HasHandle then
// Exit; //==>
{ TODO : Columns need to be redesigned completely }
if ShowColumns then
begin
// Drawing column headers
r.SetRect(1, 1, 0, FColumnHeight);
for col := 1 to rootnode.getMaxDepth - 1 do
begin
r.Width := GetColumnWidth(col);
DrawHeader(col, r, 0);
inc(r.Left, r.Width);
if r.Left >= VisibleWidth then
Break; // small optimization. Don't draw what we can't see
end;
// Fill remainder of the client area with one big header
r.width := VisibleWidth - r.Left + 1;
DrawHeader(col+1, r, 0);
end;
// Calculate the client area used for nodes and lines
if ShowColumns then
begin
r.SetRect(1, 1 + FColumnHeight, VisibleWidth, VisibleHeight);
col := FColumnHeight;
end
else
begin
r.SetRect(1, 1, VisibleWidth, VisibleHeight);
col := 0;
end;
Canvas.ClearClipRect;
Canvas.SetClipRect(r);
// draw the nodes with lines
h := RootNode.FirstSubNode;
YPos := 0;
while h <> nil do
begin
Canvas.SetTextColor(h.ParentTextColor);
// lines with + or -
w := GetColumnLeft(StepToRoot(h));
ACenterPos := YPos - FYOffset + col + (GetNodeHeight div 2);
YPos := YPos + GetNodeHeight;
i := GetColumnLeft(StepToRoot(h)) + GetNodeWidth(h);
imgx := 0;
// only paint the node if it is fully visible
if i > FXOffset then
begin
// State images must always be 16x16 pixels
if (StateImageList <> nil) and ShowImages then
begin
AImageItem := StateImageList.Items[h.StateImageIndex];
if Assigned(AImageItem) then
begin
Canvas.DrawImagePart(w - FXOffset + 1, ACenterPos - 8, AImageItem.Image, 0, 0, 16, 16);
imgx := 18; // 16px max image width + 2px spacing or right
end
else
begin
if FIndentNodeWithNoImage then
imgx := 18
else
imgx := 0;
end;
end;
if (ImageList <> nil) and ShowImages then
begin
AImageItem := ImageList.Items[h.ImageIndex];
if AImageItem <> nil then
begin
Canvas.DrawImagePart(w + imgx - FXOffset + 1, ACenterPos - 8, AImageItem.Image, 0, 0, 16, 16);
imgx += AImageItem.Image.Width + 2; // 1px spacing on right before node text
end
else
begin
if FIndentNodeWithNoImage then
imgx += FNoImageIndent + 2
else
imgx += 2;
end;
end;
if h = Selection then // draw the selection rectangle and text
begin
if Focused then
begin
Canvas.SetColor(h.ParentSelColor);
Canvas.SetTextColor(h.ParentSelTextColor);
end
else
begin
Canvas.SetColor(h.ParentInactSelColor);
Canvas.SetTextColor(h.ParentInActSelTextColor);
end;
// draw selection rectangle
Canvas.FillRectangle(w + imgx - FXOffset, ACenterPos - (GetNodeHeight div 2), GetNodeWidth(h) - imgx, GetNodeHeight);
end;
Canvas.DrawString(w + imgx - FXOffset + 2 { small spacing }, ACenterPos - (GetNodeHeight div 2), h.text);
Canvas.SetTextColor(h.ParentTextColor);
Canvas.SetLineStyle(1, FTreeLineStyle);
if (h.Count > 0) or h.HasChildren then // do we have subnodes?
begin
// small horizontal line above rectangle for first subnode (with children) only
if (h <> RootNode.FirstSubNode) then
begin
if (h.Parent.FirstSubNode = h) then
begin
Canvas.SetLineStyle(1, FTreeLineStyle);
Canvas.DrawLine(w - FXOffset - GetColumnWidth(i1) div 2 + 1, ACenterPos - 7, w - FXOffset - GetColumnWidth(i1) div 2 + 1, ACenterPos - 3);
end;
end;
// subnode rectangle around the "+" or "-"
Canvas.SetColor(FTreeLineColor);
Canvas.SetLineStyle(1, lsSolid); // rectangle is always solid line style
Canvas.DrawRectangle(w - FXOffset - GetColumnWidth(i1) div 2 - 3, ACenterPos - 3, 9, 9);
Canvas.SetColor(clText1);
if h.Collapsed {or h.HasChildren} then
begin
// draw a "+"
Canvas.DrawLine(w - FXOffset - GetColumnWidth(i1) div 2 - 1, ACenterPos + 1, w - FXOffset - GetColumnWidth(i1) div 2 + 4, ACenterPos + 1);
Canvas.DrawLine(w - FXOffset - GetColumnWidth(i1) div 2 + 1, ACenterPos - 1, w - FXOffset - GetColumnWidth(i1) div 2 + 1, ACenterPos + 4);
end
else
begin
// draw a "-"
Canvas.DrawLine(w - FXOffset - GetColumnWidth(i1) div 2 - 1, ACenterPos + 1, w - FXOffset - GetColumnWidth(i1) div 2 + 4, ACenterPos + 1);
end;
Canvas.SetLineStyle(1, FTreeLineStyle);
end
else
begin
// short horizontal line for each node
Canvas.SetColor(FTreeLineColor);
Canvas.DrawLine(w - FXOffset - GetColumnWidth(i1) div 2 + 1, ACenterPos + 1, w - FXOffset - 1, ACenterPos + 1);
end;
Canvas.SetColor(FTreeLineColor);
if h.prev <> nil then
begin
// line up to the previous node
if (h.prev.count > 0) {or h.prev.HasChildren} then
begin
// take the previous subnode rectangle in account
if (h.count > 0) or h.HasChildren then
// we have a subnode rectangle
Canvas.DrawLine(w - FXOffset - GetColumnWidth(i1) div 2 + 1, ACenterPos - 4, w - FXOffset - GetColumnWidth(i1) div 2 + 1, ACenterPos - (SpaceToVisibleNext(h.prev) * GetNodeHeight) + 5)
else
Canvas.DrawLine(w - FXOffset - GetColumnWidth(i1) div 2 + 1, ACenterPos, w - FXOffset - GetColumnWidth(i1) div 2 + 1, ACenterPos - (SpaceToVisibleNext(h.prev) * GetNodeHeight) + 5);
end
else
begin
// previous node has no subnodes
if (h.count > 0) or h.HasChildren then
// we have a subnode rectangle
Canvas.DrawLine(w - FXOffset - GetColumnWidth(i1) div 2 + 1, ACenterPos - 3, w - FXOffset - GetColumnWidth(i1) div 2 + 1, ACenterPos - SpaceToVisibleNext(h.prev) * GetNodeHeight + 1)
else
Canvas.DrawLine(w - FXOffset - GetColumnWidth(i1) div 2 + 1, ACenterPos, w - FXOffset - GetColumnWidth(i1) div 2 + 1, ACenterPos - SpaceToVisibleNext(h.prev) * GetNodeHeight + 1);
end;
end
else
begin
if (h.count > 0) or h.HasChildren then
// take the subnode rectangle in account
Canvas.DrawLine(w - FXOffset - GetColumnWidth(i1) div 2 + 1,ACenterPos - 3, w - FXOffset - GetColumnWidth(i1) div 2 + 1, ACenterPos - GetNodeHeight div 2 + 3)
else
Canvas.DrawLine(w - FXOffset - GetColumnWidth(i1) div 2 + 1, ACenterPos, w - FXOffset - GetColumnWidth(i1) div 2 + 1, ACenterPos - GetNodeHeight div 2 + 3);
end;
end;
if ShowColumns then
i := ACenterPos
else
i := ACenterPos + GetNodeHeight;
if AVisibleHeight > i then
begin
if (h.count > 0) and (not h.Collapsed) then
begin
h := h.FirstSubNode;
continue;
end;
if h.next <> nil then
h := h.next // next node
else
begin
while h.next = nil do // or recurse next node per parent
begin
h := h.parent;
if (h = nil) or (h = rootnode) then
begin
break; //==>
end;
end; { while }
h := h.next;
end; { if/else }
end
else
begin
// Draw Lines up to the parent nodes
ACenterPos := ACenterPos + GetNodeHeight;
while h <> RootNode do
begin
w := GetColumnLeft(StepToRoot(h));
if h.next <> nil then
begin
h := h.next;
if (h.prev.count > 0) {or h.prev.HasChildren} then
begin
x := w - FXOffset - GetColumnWidth(i1) div 2 + 1;
y := GetAbsoluteNodeTop(h.prev) - FYOffset + 5 + (GetNodeHeight div 2);
if ShowColumns then
inc(y, FColumnHeight);
Canvas.DrawLine(x, ACenterPos, x, y);
end
else
begin
x := w - FXOffset - GetColumnWidth(i1) div 2 + 1;
y := GetAbsoluteNodeTop(h.prev) - FYOffset + 1 + (GetNodeHeight div 2);
if ShowColumns then
inc(y, FColumnHeight);
Canvas.DrawLine(x, ACenterPos, x, y);
end;
end;
h := h.parent;
end;
break; //==>
end;
end; { while h <> nil }
end;
procedure TfpgTreeview.DrawHeader(ACol: integer; ARect: TfpgRect;
AFlags: integer);
begin
// Here we can implement a head style check
Canvas.DrawButtonFace(ARect, [btfIsEmbedded]);
end;
procedure TfpgTreeview.HandleKeyPress(var keycode: word;
var shiftstate: TShiftState; var consumed: boolean);
var
h: TfpgTreeNode;
OldSelection: TfpgTreeNode;
begin
OldSelection := Selection;
case KeyCode of
keyRight:
begin
Consumed := True;
Selection.Expand;
DoExpand(Selection);
ResetScrollbar;
RePaint;
end;
keyLeft:
begin
Consumed := True;
Selection.Collapsed := true;
ResetScrollbar;
RePaint;
end;
keyUp:
begin
if Selection = nil then
Selection := RootNode.FirstSubNode
else
if Selection <> RootNode then
begin
if NodeIsVisible(selection) then
begin
h := PrevVisualNode(Selection);
if (h <> RootNode) and (h <> nil) then
Selection := h;
end
else
begin
Selection := RootNode.FirstSubNode;
end;
end;
Consumed := True;
end;
keyDown:
begin
Consumed := True;
if Selection = nil then
Selection := RootNode.FirstSubNode
else
begin
if NodeIsVisible(selection) then
begin
h := NextVisualNode(Selection);
if (h <> nil) then
Selection := h;
end
else
Selection := RootNode.FirstSubNode;
end;
end;
keyPageUp:
begin
FVScrollbar.PageUp;
end;
keyPageDown:
begin
FVScrollbar.PageDown;
end;
else
Consumed := False;
end;
if Selection <> OldSelection then
begin
RePaint;
DoChange;
end;
if not Consumed then
inherited HandleKeyPress(keycode, shiftstate, consumed);
end;
procedure TfpgTreeview.HandleMouseScroll(x, y: integer;
shiftstate: TShiftState; delta: smallint);
var
i: integer;
dy: integer;
begin
inherited HandleMouseScroll(x, y, shiftstate, delta);
dy := (VisibleHeight div 3); // mouse scrolling is 1/3 of the height
if delta > 0 then // scrolling down
begin
inc(FYOffset, dy); //FScrollWheelDelta);
i := (GetNodeHeightSum * GetNodeHeight) - VisibleHeight + FHScrollbar.Height;
if FYOffset > i then
FYOffset := i;
i := FVScrollbar.Position + dy;
FVScrollbar.Position := i;
end
else
begin // scrolling up
dec(FYOffset, dy); //FScrollWheelDelta);
if FYOffset < 0 then
FYOffset := 0;
i := FVScrollbar.Position - dy;
FVScrollbar.Position := i;
end;
UpdateScrollbars;
RePaint;
end;
procedure TfpgTreeview.DoChange;
begin
if Assigned(FOnChange) then
FOnChange(self);
end;
procedure TfpgTreeview.DoExpand(ANode: TfpgTreeNode);
begin
if Assigned(FOnExpand) then
FOnExpand(self, ANode);
end;
function TfpgTreeview.NextVisualNode(ANode: TfpgTreeNode): TfpgTreeNode;
//----------------
procedure _FindNextNode;
begin
if ANode.Next <> nil then
begin
result := ANode.Next;
end
else
begin
while ANode.Next = nil do
begin
ANode := ANode.Parent;
if ANode = nil then
exit; //==>
end;
result := ANode.Next;
end;
end;
begin
result := nil;
if ANode.Collapsed then
begin
_FindNextNode;
end
else
begin
if ANode.Count > 0 then
begin
result := ANode.FirstSubNode;
end
else
_FindNextNode;
end;
end;
function TfpgTreeview.PrevVisualNode(ANode: TfpgTreeNode): TfpgTreeNode;
var
n: TfpgTreeNode;
begin
n := ANode;
if ANode.Prev <> nil then
begin
result := ANode.Prev;
ANode := ANode.Prev;
while (not ANode.Collapsed) and (ANode.Count > 0) do
begin
result := ANode.LastSubNode;
ANode := ANode.LastSubNode;
end;
end
else
begin
if ANode.Parent <> nil then
result := ANode.Parent
else
result := n;
end;
end;
procedure TfpgTreeView.BeginUpdate;
begin
Inc(FUpdateCount);
Updating;
end;
procedure TfpgTreeView.EndUpdate;
begin
if FUpdateCount > 0 then
begin
Dec(FUpdateCount);
if FUpdateCount = 0 then
begin
Updated;
RePaint;
end;
end;
end;
function TfpgTreeView.NextNode(ANode: TfpgTreeNode): TfpgTreeNode;
//----------------
procedure _FindNextNode;
begin
if ANode.Next <> nil then
begin
result := ANode.Next;
end
else
begin
while ANode.Next = nil do
begin
ANode := ANode.Parent; // back out one level depth
if ANode = nil then
exit; //==>
end;
result := ANode.Next;
end;
end;
begin
result := nil;
if ANode.Count > 0 then
result := ANode.FirstSubNode
else
_FindNextNode;
end;
function TfpgTreeView.PrevNode(ANode: TfpgTreeNode): TfpgTreeNode;
var
n: TfpgTreeNode;
begin
n := ANode;
if ANode.Prev <> nil then
begin
result := ANode.Prev;
ANode := ANode.Prev;
while {(not ANode.Collapsed) and} (ANode.Count > 0) do
begin
result := ANode.LastSubNode;
ANode := ANode.LastSubNode;
end;
end
else
begin
if ANode.Parent <> nil then
result := ANode.Parent
else
result := n;
end;
end;
function TfpgTreeview.SpaceToVisibleNext(aNode: TfpgTreeNode): integer;
var
h: TfpgTreeNode;
i: integer;
begin
result := 0;
i := 0;
if aNode.next = nil then
exit;
h := aNode;
while h <> aNode.next do
begin
inc(i);
if (h.count > 0) and (not h.collapsed) then
begin
h := h.FirstSubNode;
end
else
begin
while h.next = nil do
h := h.parent;
h := h.next;
end;
end;
result := i;
end;
function TfpgTreeview.StepToRoot(aNode: TfpgTreeNode): integer;
var
i: integer;
begin
i := -1;
while aNode <> nil do
begin
aNode := aNode.parent;
inc(i);
end;
result := i;
end;
procedure TfpgTreeView.RePaint;
begin
if csUpdating in ComponentState then
Exit;
inherited RePaint;
end;
constructor TfpgTreeview.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FRootNode := nil;
FSelection := nil;
FShowImages := False;
FShowColumns := False;
FDefaultColumnWidth := 15;
FFirstColumn := nil;
FFont := fpgGetFont('#Label1');
Width := 150;
Height := 100;
FUpdateCount := 0;
FHScrollbar := TfpgScrollbar.Create(self);
FHScrollbar.Orientation := orHorizontal;
FHScrollbar.OnScroll := @HScrollbarScroll;
FHScrollbar.Visible := False;
FHScrollbar.Position := 0;
FHScrollbar.SliderSize := 0.5;
FVScrollbar := TfpgScrollbar.Create(self);
FVScrollbar.Orientation := orVertical;
FVScrollbar.OnScroll := @VScrollbarScroll;
FVScrollbar.Visible := False;
FVScrollbar.Position := 0;
FVScrollbar.SliderSize := 0.2;
FBackgroundColor := clListBox;
FTreeLineColor := clShadow1; //clText1;
FTreeLineStyle := lsDot;
FFocusable := True;
FMoving := False;
FXOffset := 0;
FYOffset := 0;
FColumnHeight := FFont.Height + 2;
FScrollWheelDelta := 15;
FNoImageIndent := 16;
FIndentNodeWithNoImage := True;
end;
destructor TfpgTreeView.Destroy;
begin
if Assigned(FColumnLeft) then
begin
ClearColumnLeft;
FColumnLeft.Free;
end;
FFont.Free;
FreeAllTreeNodes;
FRootNode.Free;
inherited Destroy;
end;
procedure TfpgTreeview.SetColumnWidth(AIndex, AWidth: word);
var
h: PfpgTreeColumnWidth;
n: PfpgTreeColumnWidth;
i: word;
begin
{$IFDEF DEBUG}
SendDebug(Classname + '.SetColumnWidth');
{$ENDIF}
h := FFirstColumn;
if h = nil then
begin
new(h);
h^.width := FDefaultColumnWidth;
h^.next := nil;
FFirstColumn := h;
end;
i := 0;
while i < AIndex do
begin
if h^.next = nil then
begin
new(n);
h^.next := n;
n^.width := DefaultColumnWidth;
n^.next := nil;
end;
h := h^.next;
inc(i);
end;
if h^.width <> AWidth then
begin
h^.width := AWidth;
RePaint;
end;
end;
end.
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