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| ///////////////////////////////////////////////////////////////////////////
// //
// Copyright (c) 2015 by Charta Software B.V. //
// All rights reserved //
// //
// Version: 1.7.0.83525 //
// Web site: https://pascal.chartasoftware.com/ //
// //
// This code and information are provided "as is" without warranty of //
// any kind. Dissemination of this information or reproduction of //
// this material is strictly forbidden unless prior written permission //
// is obtained from Charta Software B.V.. //
// //
///////////////////////////////////////////////////////////////////////////
unit UserInterface.Control.Tree;
interface
uses
Boolean,
Drawing.Canvas,
Geometry._2d.FloatingPoint64.Rectangle,
Geometry._2d.Integer32.Point,
Geometry._2d.Integer32.Rectangle,
Geometry._2d.Integer32.Size,
Integer._32,
Tree.Model,
Tree.Navigator,
Tree.Node.Opened.Paths,
Tree.Node.Path,
UserInterface.Control,
UserInterface.Keyboard.Event,
UserInterface.Keyboard.Modifiers,
UserInterface.Mouse.Event,
UserInterface.Navigation,
Value.Path;
type
TTreeControl = class;
TTreeControlModelListener = class(TTreeModelListener)
public
TreeControl: TTreeControl;
procedure Changed(TreeModel: TTreeModel); override;
procedure NodeAdded(TreeModel: TTreeModel); override;
procedure NodeRemoved(TreeModel: TTreeModel); override;
end;
TTreeControl = class(TControl)
private
FModel: TTreeModel;
FFocusedNodePath: TNavigatableTreeNodePath;
FAutoExpandAll: TBoolean;
OpenedNodePaths: TOpenedTreeNodePaths;
ItemHeight: TInteger32;
TopNodePath: TNavigatableTreeNodePath;
TreeModelListener: TTreeControlModelListener;
procedure SetModel(const Value: TTreeModel);
const
GlyphSize = 11;
protected
function GetContextMenuTargetBounds(): TInteger32Rectangle; override;
function NodePathIsVisible(Path: TTreeNodePath): TBoolean;
function NodePathAtRow(Row: TInteger32): TNavigatableTreeNodePath;
function RowAtY(Y: TInteger32): TInteger32;
function PositionInGlyph(Path: TTreeNodePath; Position: TInteger32Point): TBoolean;
function NodePathsVisible(): TInteger32;
function NodePathsVisibleForHeight(Height: TInteger32): TInteger32;
function IndexOfTopNodePath(): TInteger32;
function GetNodeTop(Path: TTreeNodePath): TInteger32;
function GetNodeInset(Path: TTreeNodePath): TInteger32;
function GetNodeBounds(Path: TTreeNodePath): TInteger32Rectangle;
procedure PaintTreeGlyphBackground(Canvas: TCanvas; const Bounds: T2dFloatingPoint64Rectangle);
procedure PaintTreeGlyphClosed(Canvas: TCanvas; const Bounds: T2dFloatingPoint64Rectangle);
procedure PaintTreeGlyphOpened(Canvas: TCanvas; const Bounds: T2dFloatingPoint64Rectangle);
procedure PaintNodePath(Canvas: TCanvas; Path: TTreeNodePath; Top: TInteger32);
procedure PaintNodePaths(Canvas: TCanvas);
procedure CorrectFocusedNodePathForCollapse(Path: TNavigatableTreeNodePath);
procedure CorrectTopNodePathForExpand(Path: TTreeNodePath);
function Navigate(Direction: TNavigationDirection; KeyModifiers: TKeyModifiers): TBoolean; override;
procedure ScrollNodeIntoView(Path: TTreeNodePath);
procedure FireFocusedNodeChanged();
procedure TestFocusedNodePathChanged(PreviousFocusedNodePath: TTreeNodePath);
procedure RefreshCachedInformation(); deprecated; // TODO: We should refresh based on model updates
public
AllowRefresh: TBoolean;
constructor Create(); override;
destructor Destroy(); override;
procedure Paint(Canvas: TCanvas); override;
function Embellish: TControl; override;
procedure VisibleRectangleChanged(); override;
function Toggle(Path: TNavigatableTreeNodePath): TBoolean;
function Collapse(Path: TNavigatableTreeNodePath): TBoolean;
function Expand(Path: TTreeNodePath): TBoolean;
procedure ExpandAll();
procedure ExpandRoot();
procedure Changed();
procedure NodeAdded();
procedure NodeRemoved();
function GetPreferredSize(AvailableSize: TInteger32Size): TInteger32Size; override;
function GetScrollSize(AvailableSize: TInteger32Size): TInteger32Size; override;
function MouseLeftDown(Event: TMouseButtonEvent): TBoolean; override;
function MouseRightDown(Event: TMouseButtonEvent): TBoolean; override;
function KeyDown(Event: TKeyDownEvent): TBoolean; override;
function HandlesNavigationDimension(NavigationDimension: TValidNavigationDimension): TBoolean; override;
function GetFocusedObject(): TValuePath; override;
property Model: TTreeModel read FModel write SetModel;
property FocusedNodePath: TNavigatableTreeNodePath read FFocusedNodePath;
property AutoExpandAll: TBoolean read FAutoExpandAll write FAutoExpandAll;
end;
implementation
uses
Color,
Color.Constants,
Drawing.Fill,
Drawing.Stroke,
Drawing.Stroke.Pattern,
FloatingPoint._64,
FloatingPoint._64.Interval,
Font.Purpose,
Geometry._2d.FloatingPoint64.Point,
Geometry._2d.FloatingPoint64.Size,
Geometry._2d.Polygon,
Mathematics,
Tree.Node,
TypedValue,
UserInterface.Control.Border,
UserInterface.Control.Event,
UserInterface.Control.Scroll.Panel,
UserInterface.Keyboard.Key;
{ TTreeControl }
constructor TTreeControl.Create();
begin
inherited Create();
OpenedNodePaths := TOpenedTreeNodePaths.Create();
OpenedNodePaths.AddReference();
TopNodePath := TNavigatableTreeNodePath.Create();
TopNodePath.PathOpenCondition := OpenedNodePaths;
FFocusedNodePath := TNavigatableTreeNodePath.Create();
FFocusedNodePath.PathOpenCondition := OpenedNodePaths;
TreeModelListener := TTreeControlModelListener.Create();
TreeModelListener.TreeControl := Self;
ItemHeight := 16;
AllowRefresh := True;
end;
function TTreeControl.GetContextMenuTargetBounds(): TInteger32Rectangle;
begin
Result := GetNodeBounds(FocusedNodePath);
Result.Right := GetNodeInset(FocusedNodePath) + GlyphSize;
end;
function TTreeControl.GetFocusedObject(): TValuePath;
begin
Result := FocusedNodePath.CreateIdentifierPath();
end;
destructor TTreeControl.Destroy();
begin
if Model <> nil then
begin
Model.Listeners.Remove(TreeModelListener);
Model.ReleaseReference();
end;
FocusedNodePath.Free();
TopNodePath.Free();
TreeModelListener.Free();
OpenedNodePaths.ReleaseReference();
inherited Destroy();
end;
function TTreeControl.MouseLeftDown(Event: TMouseButtonEvent): TBoolean;
var
Path: TNavigatableTreeNodePath;
PreviousFocusedNodePath: TTreeNodePath;
Row: TInteger32;
begin
Result := True;
Row := RowAtY(Event.Position.Y);
Path := NodePathAtRow(Row);
PreviousFocusedNodePath := FocusedNodePath.Copy();
if PositionInGlyph(Path, Event.Position) then
Toggle(Path)
else
begin
if Event.Count = 2 then
FireDefaultActionExecuted()
else
FocusedNodePath.StartAt(Path);
end;
Path.Free();
Invalidate();
TestFocusedNodePathChanged(PreviousFocusedNodePath);
end;
function TTreeControl.MouseRightDown(Event: TMouseButtonEvent): TBoolean;
begin
Result := True;
if Event.Count = 1 then
FireEvent(TControlContextMenuEvent.Create(Self, Event.Position));
end;
function TTreeControl.NodePathAtRow(Row: TInteger32): TNavigatableTreeNodePath;
begin
Result := TopNodePath.Copy();
Result.Walk(Row - IndexOfTopNodePath);
end;
procedure TTreeControl.Paint(Canvas: TCanvas);
begin
if Model <> nil then
begin
RefreshCachedInformation();
PaintNodePaths(Canvas);
end;
end;
procedure TTreeControl.RefreshCachedInformation();
var
PreviousVisibleNodeCount: TInteger32;
begin
if AllowRefresh then
begin
TopNodePath.Refresh();
FocusedNodePath.Refresh();
PreviousVisibleNodeCount := OpenedNodePaths.VisiblePathCount(1);
OpenedNodePaths.Refresh(Model);
if PreviousVisibleNodeCount <> OpenedNodePaths.VisiblePathCount(1) then
RethinkScrollBars();
end;
end;
function TTreeControl.RowAtY(Y: TInteger32): TInteger32;
begin
Result := Y div ItemHeight;
end;
procedure TTreeControl.SetModel(const Value: TTreeModel);
begin
if Value <> Model then
begin
if Model <> nil then
begin
Model.Listeners.Remove(TreeModelListener);
Model.ReleaseReference();
end;
FModel := Value;
if Model <> nil then
begin
Model.AddReference();
Model.Listeners.Add(TreeModelListener);
end;
OpenedNodePaths.Clear();
TopNodePath.Model := Value;
FocusedNodePath.Model := Value;
if Model <> nil then
begin
TopNodePath.StartAtRoot();
FocusedNodePath.StartAtRoot();
ExpandRoot();
end
else
begin
TopNodePath.Clear();
FocusedNodePath.Clear();
end;
RethinkScrollBars();
// AdjustEditor();
Invalidate();
end;
end;
function TTreeControl.GetPreferredSize(AvailableSize: TInteger32Size): TInteger32Size;
begin
Result := TInteger32Size.New(0, ItemHeight * OpenedNodePaths.VisiblePathCount(1));
end;
function TTreeControl.NodePathsVisible(): TInteger32;
var
VisibleRectangle: TInteger32Rectangle;
begin
VisibleRectangle := GetVisibleRectangle();
Result := NodePathsVisibleForHeight(VisibleRectangle.Height);
end;
function TTreeControl.NodePathsVisibleForHeight(Height: TInteger32): TInteger32;
begin
Result := Height div ItemHeight;
end;
function TTreeControl.Toggle(Path: TNavigatableTreeNodePath): TBoolean;
var
PreviousFocusedNodePath: TTreeNodePath;
begin
Result := OpenedNodePaths.Toggle(Path);
PreviousFocusedNodePath := FocusedNodePath.Copy();
RethinkScrollBars();
if Result then
CorrectTopNodePathForExpand(Path)
else
CorrectFocusedNodePathForCollapse(Path);
Invalidate();
TestFocusedNodePathChanged(PreviousFocusedNodePath);
end;
procedure TTreeControl.PaintNodePaths(Canvas: TCanvas);
var
Top: TInteger32;
Path: TNavigatableTreeNodePath;
VisibleRectangle: TInteger32Rectangle;
begin
Canvas.Font := TPurposeFont.WindowText;
Path := TopNodePath.Copy();
Top := GetNodeTop(TopNodePath);
VisibleRectangle := GetVisibleRectangle();
repeat
PaintNodePath(Canvas, Path, Top);
Inc(Top, ItemHeight);
until (Top > VisibleRectangle.Bottom) or not Path.GotoNext();
Path.Free();
end;
procedure TTreeControl.PaintTreeGlyphBackground(Canvas: TCanvas; const Bounds: T2dFloatingPoint64Rectangle);
begin
Canvas.Fill := TFill.Create(TNamedColor.White);
Canvas.FillRectangle(Bounds);
end;
procedure TTreeControl.PaintTreeGlyphClosed(Canvas: TCanvas; const Bounds: T2dFloatingPoint64Rectangle);
var
Triangle: T2dPolygon;
Center: T2dFloatingPoint64Point;
Offset: TFloatingPoint64;
begin
PaintTreeGlyphBackground(Canvas, Bounds);
Center := Bounds.Center;
Offset := Bounds.Width / 4;
Triangle := T2dPolygon.Create();
Triangle.Points.Add(T2dFloatingPoint64Point.New(Bounds.Left + Offset, Bounds.Top));
Triangle.Points.Add(T2dFloatingPoint64Point.New(Center.X + Offset, Center.Y));
Triangle.Points.Add(T2dFloatingPoint64Point.New(Bounds.Left + Offset, Bounds.Bottom));
Canvas.Fill := TFill.Create(TNamedColor.LightGray);
Canvas.FillGeometry(Triangle);
end;
procedure TTreeControl.PaintTreeGlyphOpened(Canvas: TCanvas; const Bounds: T2dFloatingPoint64Rectangle);
var
Triangle: T2dPolygon;
Center: T2dFloatingPoint64Point;
begin
PaintTreeGlyphBackground(Canvas, Bounds);
Center := Bounds.Center;
Triangle := T2dPolygon.Create();
Triangle.Points.Add(T2dFloatingPoint64Point.New(Bounds.Left, Center.Y));
Triangle.Points.Add(T2dFloatingPoint64Point.New(Bounds.Right, Center.Y));
Triangle.Points.Add(T2dFloatingPoint64Point.New(Center.X, Bounds.Bottom));
Canvas.Fill := TFill.Create(TNamedColor.LightGray);
Canvas.FillGeometry(Triangle);
end;
procedure TTreeControl.PaintNodePath(Canvas: TCanvas; Path: TTreeNodePath; Top: TInteger32);
var
Node: TTreeNode;
NodeValue: TTypedValue;
Level: TInteger32;
Left: TInteger32;
i: TInteger32;
AvailableSize: TInteger32Size;
CaptionSize: TInteger32Size;
CaptionBounds: TInteger32Rectangle;
IsFocusedPath: TBoolean;
Painter: TControl;
GlyphBounds: T2dFloatingPoint64Rectangle;
ValuePath: TValuePath;
ControlFactory: TControlFactory;
begin
Node := Path.LastNode;
Level := Path.Length - 1;
Left := GetNodeInset(Path);
Canvas.Stroke := TStroke.Create(TPurposeColor.TreeBranch, 1, TStrokePattern.Create([1, 1]));
Canvas.HorizontalLine(TFloatingPoint64Interval.New(Left + 7, Left + 17), Top + ItemHeight div 2 + 0.5);
if Level > 0 then
Canvas.VerticalLine(Level * 18 + 5.5, TFloatingPoint64Interval.New(Top, Top + ItemHeight div 2));
for i := 1 to Level do
if Path[i].IndexInParent < Path[i - 1].GetChildCount() - 1 then
Canvas.VerticalLine(i * 18 + 5.5, TFloatingPoint64Interval.New(Top, Top + 16));
if Node.GetChildCount() > 0 then
begin
GlyphBounds := T2dFloatingPoint64Rectangle.New(T2dFloatingPoint64Point.New(Left, Top + 2), T2dFloatingPoint64Size.NewSquare(GlyphSize));
if OpenedNodePaths.Matches(Path) then
PaintTreeGlyphOpened(Canvas, GlyphBounds)
else
PaintTreeGlyphClosed(Canvas, GlyphBounds);
end;
NodeValue := Model.GetPathValue(Path);
NodeValue.AddReference();
try
IsFocusedPath := Path.Equals(FocusedNodePath);
Inc(Left, 18);
ControlFactory := GetControlFactory();
ValuePath := TValuePath.Create([NodeValue.Value]);
ValuePath.AddReference();
try
Painter := ControlFactory.CreateControl(ControlFactory, TControlPurpose.Cell, ValuePath, NodeValue);
Painter.SuppressInvalidate := True;
Painter.ParentControl := Self;
try
AvailableSize := TInteger32Size.New(Bounds.Right - Left - 1, ItemHeight);
CaptionSize := Painter.GetPreferredSize(AvailableSize);
CaptionSize.Width := Minimum(CaptionSize.Width, AvailableSize.Width);
CaptionBounds := TInteger32Rectangle.New(Left - 1, Top, Left + CaptionSize.Width + 1, Top + ItemHeight - 2);
if IsFocusedPath then
begin
Canvas.Fill := TFill.Create(SelectionColor(ReceivesKeyboardInput));
Canvas.OverlayRectangle(CaptionBounds, 1);
end
else if Node.Identifier.Equals(FocusedNodePath.LastNode.Identifier) then
begin
Canvas.Fill := TFill.Create(TNamedColor.LightYellow);
Canvas.FillRectangle(CaptionBounds);
end;
Painter.Bounds := CaptionBounds.InsetHorizontally(1);
PaintChildControl(Canvas, Painter);
finally
Painter.Free();
end;
finally
ValuePath.ReleaseReference();
end;
finally
NodeValue.ReleaseReference();
end;
if IsFocusedPath and ReceivesKeyboardInput then
PaintFocusRectangle(Canvas, CaptionBounds);
end;
function TTreeControl.Navigate(Direction: TNavigationDirection; KeyModifiers: TKeyModifiers): TBoolean;
var
PreviousFocusedNodePath: TTreeNodePath;
Offset: TInteger32;
begin
Result := False;
PreviousFocusedNodePath := FocusedNodePath.Copy();
if Direction in [TNavigationDirection.Down, TNavigationDirection.Up, TNavigationDirection.PageUp, TNavigationDirection.PageDown] then
begin
case Direction of
TNavigationDirection.Down:
Offset := 1;
TNavigationDirection.Up:
Offset := -1;
TNavigationDirection.PageUp:
Offset := -NodePathsVisible;
TNavigationDirection.PageDown:
Offset := NodePathsVisible;
else
Offset := 0;
end;
Result := FocusedNodePath.Walk(Offset) <> 0;
if Result then
ScrollNodeIntoView(FocusedNodePath);
end
else if Direction in [TNavigationDirection.Right, TNavigationDirection.Left] then
begin
Result :=
(FocusedNodePath.LastNode.GetChildCount() > 0)
and (
((Direction = TNavigationDirection.Right) and Expand(FocusedNodePath))
or ((Direction = TNavigationDirection.Left) and Collapse(FocusedNodePath))
);
if not Result and (((Direction = TNavigationDirection.Left) and FocusedNodePath.GotoParent()) or ((Direction = TNavigationDirection.Right) and FocusedNodePath.GotoNext())) then
begin
ScrollNodeIntoView(FocusedNodePath);
Result := True;
end;
end;
if Result then
Invalidate();
TestFocusedNodePathChanged(PreviousFocusedNodePath);
end;
function TTreeControl.PositionInGlyph(Path: TTreeNodePath; Position: TInteger32Point): TBoolean;
var
Top: TInteger32;
Left: TInteger32;
begin
Top := GetNodeTop(Path) + (ItemHeight - GlyphSize) div 2;
Left := 18 * (Path.Length - 1) - 2;
Result := (Position.Y >= Top) and (Position.Y < Top + GlyphSize + 2) and (Position.X >= Left) and (Position.X < Left + GlyphSize + 2) and (Path.LastNode.GetChildCount() > 0);
end;
function TTreeControl.Collapse(Path: TNavigatableTreeNodePath): TBoolean;
var
PreviousFocusedNodePath: TTreeNodePath;
begin
Result := OpenedNodePaths.Close(Path);
PreviousFocusedNodePath := FocusedNodePath.Copy();
if Result then
begin
RethinkScrollBars();
CorrectFocusedNodePathForCollapse(Path);
Invalidate();
end;
TestFocusedNodePathChanged(PreviousFocusedNodePath);
end;
function TTreeControl.Expand(Path: TTreeNodePath): TBoolean;
var
PreviousFocusedNodePath: TTreeNodePath;
begin
Result := OpenedNodePaths.Open(Path);
PreviousFocusedNodePath := FocusedNodePath.Copy();
if Result then
begin
RethinkScrollBars();
CorrectTopNodePathForExpand(Path);
Invalidate();
end;
TestFocusedNodePathChanged(PreviousFocusedNodePath);
end;
procedure TTreeControl.ScrollNodeIntoView(Path: TTreeNodePath);
begin
MakeRectangleVisible(GetNodeBounds(Path));
end;
function TTreeControl.GetScrollSize(AvailableSize: TInteger32Size): TInteger32Size;
begin
Result := TInteger32Size.New(AvailableSize.Width, Maximum(ItemHeight * OpenedNodePaths.VisiblePathCount(1), AvailableSize.Height));
end;
function TTreeControl.NodePathIsVisible(Path: TTreeNodePath): TBoolean;
var
Bounds: TInteger32Rectangle;
VisibleRectangle: TInteger32Rectangle;
begin
Bounds := GetNodeBounds(Path);
VisibleRectangle := GetVisibleRectangle();
Result := VisibleRectangle.Contains(Bounds);
end;
procedure TTreeControl.CorrectFocusedNodePathForCollapse(Path: TNavigatableTreeNodePath);
begin
if Path.IsAncestorOf(FocusedNodePath) then
begin
FocusedNodePath.StartAt(Path);
Invalidate();
end;
end;
procedure TTreeControl.CorrectTopNodePathForExpand(Path: TTreeNodePath);
var
Rectangle: TInteger32Rectangle;
begin
if NodePathIsVisible(Path) then
begin
Rectangle := GetNodeBounds(Path);
Rectangle.Bottom := Minimum(Height - 1, Rectangle.Bottom + OpenedNodePaths.VisibleDescendantCount(Path) * ItemHeight - 1);
MakeRectangleVisible(Rectangle);
end;
end;
procedure TTreeControl.VisibleRectangleChanged();
var
VisibleRectangle: TInteger32Rectangle;
begin
VisibleRectangle := GetVisibleRectangle();
TopNodePath.Walk(VisibleRectangle.Top div ItemHeight - IndexOfTopNodePath);
Invalidate();
inherited VisibleRectangleChanged();
end;
procedure TTreeControl.Changed();
begin
OpenedNodePaths.Clear();
TopNodePath.StartAtRoot();
FocusedNodePath.StartAtRoot();
RethinkScrollBars();
if AutoExpandAll then
ExpandAll();
Invalidate();
end;
procedure TTreeControl.ExpandAll();
var
PreviousFocusedNodePath: TTreeNodePath;
ExpandPath: TNavigatableTreeNodePath;
Advanced: TBoolean;
begin
ExpandPath := TNavigatableTreeNodePath.Create();
ExpandPath.Model := Model;
ExpandPath.PathOpenCondition := OpenedNodePaths;
ExpandPath.StartAtRoot();
PreviousFocusedNodePath := FocusedNodePath.Copy();
Advanced := ExpandPath.Length > 0;
while Advanced do
begin
if (ExpandPath.LastNode.GetChildCount() > 0) and not ExpandPath.IsCyclicAtLastNode() then
OpenedNodePaths.Open(ExpandPath);
Advanced := ExpandPath.GotoNext();
end;
ExpandPath.Free();
RethinkScrollBars();
Invalidate();
TestFocusedNodePathChanged(PreviousFocusedNodePath);
end;
procedure TTreeControl.ExpandRoot();
var
RootPath: TNavigatableTreeNodePath;
begin
RootPath := TNavigatableTreeNodePath.Create();
RootPath.Model := Model;
RootPath.StartAtRoot();
if RootPath.LastNode.GetChildCount() > 0 then
Expand(RootPath);
RootPath.Free();
end;
procedure TTreeControl.NodeAdded();
begin
TopNodePath.StartAtRoot();
FocusedNodePath.StartAtRoot();
RethinkScrollBars();
Invalidate();
end;
function TTreeControl.Embellish(): TControl;
var
ControlBorder: TControlBorder;
ScrollPanel: TScrollPanel;
begin
ScrollPanel := TScrollPanel.Create();
ScrollPanel.Panel[TInteger32Point.New(0, 0)] := Self;
ControlBorder := TControlBorder.Create();
ControlBorder.Control := ScrollPanel;
Result := ControlBorder;
end;
procedure TTreeControl.FireFocusedNodeChanged();
begin
FireEvent(TControlFocusedItemChangedEvent.Create(Self));
end;
function TTreeControl.GetNodeBounds(Path: TTreeNodePath): TInteger32Rectangle;
begin
Result.Top := GetNodeTop(Path);
Result.Bottom := Result.Top + ItemHeight - 1;
Result.Left := 0;
Result.Right := Width - 1;
end;
function TTreeControl.GetNodeInset(Path: TTreeNodePath): TInteger32;
begin
Result := 18 * (Path.Length - 1);
end;
function TTreeControl.GetNodeTop(Path: TTreeNodePath): TInteger32;
begin
Result := OpenedNodePaths.VisibleIndex(Path) * ItemHeight;
end;
function TTreeControl.HandlesNavigationDimension(NavigationDimension: TValidNavigationDimension): TBoolean;
begin
Result := True;
end;
function TTreeControl.IndexOfTopNodePath(): TInteger32;
begin
Result := OpenedNodePaths.VisibleIndex(TopNodePath);
end;
procedure TTreeControl.TestFocusedNodePathChanged(PreviousFocusedNodePath: TTreeNodePath);
begin
if not FocusedNodePath.Equals(PreviousFocusedNodePath) then
FireFocusedNodeChanged();
PreviousFocusedNodePath.Free();
end;
function TTreeControl.KeyDown(Event: TKeyDownEvent): TBoolean;
begin
Result := Event.Key = TKey.Enter;
if Result then
FireDefaultActionExecuted()
else
Result := inherited KeyDown(Event);
end;
procedure TTreeControl.NodeRemoved();
begin
TopNodePath.StartAtRoot();
FocusedNodePath.StartAtRoot();
RethinkScrollBars();
Invalidate();
end;
{ TTreeControlModelListener }
procedure TTreeControlModelListener.Changed(TreeModel: TTreeModel);
begin
if TreeModel = TreeControl.Model then
TreeControl.Changed();
end;
procedure TTreeControlModelListener.NodeAdded(TreeModel: TTreeModel);
begin
if TreeModel = TreeControl.Model then
TreeControl.NodeAdded();
end;
procedure TTreeControlModelListener.NodeRemoved(TreeModel: TTreeModel);
begin
if TreeModel = TreeControl.Model then
TreeControl.NodeRemoved();
end;
end.
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