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lazarus/ideintf/componenttreeview.pas

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{
*****************************************************************************
* *
* See the file COPYING.modifiedLGPL.txt, included in this distribution, *
* for details about the copyright. *
* *
* 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. *
* *
*****************************************************************************
Author: Mattias Gaertner
Abstract:
TComponentTreeView is a component to show the child components of a
TComponent. TControls are shown in a hierachic view.
It supports
- multi selecting components
- editing the creation order
- editing the TControl.Parent hierachy
For an usage example, see the object inspector.
}
unit ComponentTreeView;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, TypInfo, LCLProc, AvgLvlTree, Dialogs, Controls, ComCtrls,
ExtCtrls, LResources,
ObjInspStrConsts, PropEdits;
type
{ TComponentTreeView }
TComponentTreeView = class(TCustomTreeView)
private
FComponentList: TBackupComponentList;
FOnModified: TNotifyEvent;
FPropertyEditorHook: TPropertyEditorHook;
FImageList: TImageList;
function GetSelection: TPersistentSelectionList;
procedure SetPropertyEditorHook(const AValue: TPropertyEditorHook);
procedure SetSelection(const NewSelection: TPersistentSelectionList);
protected
procedure DoSelectionChanged; override;
function GetImageFor(APersistent: TPersistent):integer;
procedure DragOver(Source: TObject; X, Y: Integer; State: TDragState;
var Accept: Boolean); override;
procedure DragCanceled; override;
procedure MouseLeave; override;
procedure GetComponentInsertMarkAt(X, Y: Integer;
out AnInsertMarkNode: TTreeNode;
out AnInsertMarkType: TTreeViewInsertMarkType);
procedure DoModified;
public
constructor Create(TheOwner: TComponent); override;
destructor Destroy; override;
procedure DragDrop(Source: TObject; X, Y: Integer); override;
procedure RebuildComponentNodes; virtual;
procedure UpdateComponentNodesValues; virtual;
function CreateNodeCaption(APersistent: TPersistent): string; virtual;
public
property Selection: TPersistentSelectionList read GetSelection
write SetSelection;
property PropertyEditorHook: TPropertyEditorHook
read FPropertyEditorHook write SetPropertyEditorHook;
property OnSelectionChanged;
property OnModified: TNotifyEvent read FOnModified write FOnModified;
end;
implementation
type
TCollectionAccess = class(TCollection);
TComponentCandidate = class
public
APersistent: TPersistent;
Parent: TComponent;
Added: boolean;
end;
TGetCollectionProc = procedure(ACollection: TCollection) of object;
{ TComponentWalker }
TComponentWalker = class
FTreeView: TComponentTreeView;
FCandidates: TAvgLvlTree;
FRootComponent: TComponent;
FNode: TTreeNode;
protected
procedure GetCollections(AComponent: TComponent; AProc: TGetCollectionProc);
public
constructor Create(
ATreeView: TComponentTreeView; ACandidates: TAvgLvlTree;
ARootComponent: TComponent; ANode: TTreeNode);
procedure Walk(AComponent: TComponent);
procedure AddCollection(ACollection: TCollection);
end;
TComponentAccessor = class(TComponent);
function CompareComponentCandidates(
Candidate1, Candidate2: TComponentCandidate): integer;
begin
Result := ComparePointers(Candidate1.APersistent, Candidate2.APersistent);
end;
function ComparePersistentWithComponentCandidate(
APersistent: TPersistent; Candidate: TComponentCandidate): integer;
begin
Result := ComparePointers(APersistent, Candidate.APersistent);
end;
{ TComponentWalker }
procedure TComponentWalker.GetCollections(AComponent: TComponent; AProc: TGetCollectionProc);
var
PropList: PPropList;
i, PropCount: Integer;
Obj: TObject;
begin
PropCount := GetPropList(AComponent, PropList);
try
for i := 0 to PropCount - 1 do
if (PropList^[i]^.PropType^.Kind = tkClass) then
begin
Obj := GetObjectProp(AComponent, PropList^[i], TCollection);
if Assigned(Obj) then
AProc(TCollection(Obj));
end;
finally
FreeMem(PropList);
end;
end;
constructor TComponentWalker.Create(ATreeView: TComponentTreeView;
ACandidates: TAvgLvlTree; ARootComponent: TComponent; ANode: TTreeNode);
begin
FTreeView := ATreeView;
FCandidates := ACandidates;
FRootComponent := ARootComponent;
FNode := ANode;
end;
procedure TComponentWalker.Walk(AComponent: TComponent);
var
OldNode: TTreeNode;
Candidate: TComponentCandidate;
AVLNode: TAvgLvlTreeNode;
Root: TComponent;
begin
if GetLookupRootForComponent(AComponent) <> FRootComponent then Exit;
AVLNode := FCandidates.FindKey(AComponent, TListSortCompare(@ComparePersistentWithComponentCandidate));
if AVLNode = nil then Exit;
Candidate := TComponentCandidate(AVLNode.Data);
if Candidate.Added then Exit;
Candidate.Added := True;
OldNode := FNode;
FNode := FTreeView.Items.AddChild(FNode, FTreeView.CreateNodeCaption(AComponent));
FNode.Data := AComponent;
FNode.ImageIndex := FTreeView.GetImageFor(AComponent);
FNode.SelectedIndex := FNode.ImageIndex;
FNode.MultiSelected := FTreeView.Selection.IndexOf(AComponent) >= 0;
GetCollections(AComponent, @AddCollection);
if (csInline in AComponent.ComponentState) or (AComponent.Owner = nil) then
Root := AComponent
else
Root := AComponent.Owner;
if not ((Root is TControl) and (csOwnedChildrenNotSelectable in TControl(Root).ControlStyle)) then
TComponentAccessor(AComponent).GetChildren(@Walk, Root);
FNode := OldNode;
FNode.Expanded := True;
end;
procedure TComponentWalker.AddCollection(ACollection: TCollection);
var
CollectionNode, ItemNode: TTreeNode;
i: integer;
Item: TCollectionItem;
begin
if GetLookupRootForComponent(ACollection) <> FRootComponent then Exit;
CollectionNode := FTreeView.Items.AddChild(FNode, FTreeView.CreateNodeCaption(ACollection));
CollectionNode.Data := ACollection;
CollectionNode.ImageIndex := FTreeView.GetImageFor(ACollection);
CollectionNode.SelectedIndex := CollectionNode.ImageIndex;
CollectionNode.MultiSelected := FTreeView.Selection.IndexOf(ACollection) >= 0;
for i := 0 to ACollection.Count - 1 do
begin
Item := ACollection.Items[i];
ItemNode := FTreeView.Items.AddChild(CollectionNode, FTreeView.CreateNodeCaption(Item));
ItemNode.Data := Item;
ItemNode.ImageIndex := FTreeView.GetImageFor(Item);
ItemNode.SelectedIndex := ItemNode.ImageIndex;
ItemNode.MultiSelected := FTreeView.Selection.IndexOf(Item) >= 0;
end;
FNode.Expanded := True;
end;
{ TComponentTreeView }
procedure TComponentTreeView.SetSelection(const NewSelection: TPersistentSelectionList);
begin
if (PropertyEditorHook = nil) then
begin
if (FComponentList.LookupRoot = nil) then
Exit;
FComponentList.Clear;
end
else
if not NewSelection.ForceUpdate and FComponentList.IsEqual(PropertyEditorHook.LookupRoot, NewSelection) then
begin
// nodes ok, but maybe node values need update
UpdateComponentNodesValues;
Exit;
end;
FComponentList.LookupRoot := PropertyEditorHook.LookupRoot;
FComponentList.Selection.Assign(NewSelection);
RebuildComponentNodes;
end;
procedure TComponentTreeView.DoSelectionChanged;
var
ANode: TTreeNode;
APersistent: TPersistent;
NewSelection: TPersistentSelectionList;
begin
NewSelection := TPersistentSelectionList.Create;
try
if (PropertyEditorHook<>nil) and
(PropertyEditorHook.LookupRoot<>nil) and
(not (csDestroying in ComponentState)) then
begin
ANode := GetFirstMultiSelected;
while ANode <> nil do
begin
APersistent := TPersistent(ANode.Data);
if APersistent = nil then
RaiseGDBException('TComponentTreeView.DoSelectionChanged ANode.Data=nil');
if GetLookupRootForComponent(APersistent) = PropertyEditorHook.LookupRoot then
NewSelection.Add(APersistent);
ANode := ANode.GetNextMultiSelected;
end;
NewSelection.SortLike(FComponentList.Selection);
end;
if NewSelection.IsEqual(FComponentList.Selection) then
Exit;
FComponentList.Selection.Assign(NewSelection);
if (NewSelection.Count=1) and
(NewSelection[0] is TCustomPage) and
(TCustomPage(NewSelection[0]).Parent is TCustomNotebook) then
begin
TCustomNotebook(TCustomPage(NewSelection[0]).Parent).PageIndex :=
TCustomPage(NewSelection[0]).PageIndex;
end;
inherited DoSelectionChanged;
finally
NewSelection.Free;
end;
end;
procedure TComponentTreeView.DragDrop(Source: TObject; X, Y: Integer);
var
Node, SelNode: TTreeNode;
ACollection: TCollection;
AContainer: TWinControl;
AControl: TControl;
ParentNode: TTreeNode;
InsertType: TTreeViewInsertMarkType;
NewIndex, AIndex: Integer;
ok: Boolean;
begin
GetComponentInsertMarkAt(X, Y, Node, InsertType);
SetInsertMark(nil, tvimNone);
ParentNode := Node;
if InsertType in [tvimAsNextSibling, tvimAsPrevSibling] then
ParentNode := ParentNode.Parent;
if Assigned(ParentNode) then
begin
if TObject(ParentNode.Data) is TWinControl then
begin
AContainer := TWinControl(ParentNode.Data);
SelNode := GetFirstMultiSelected;
while Assigned(SelNode) do
begin
if TObject(SelNode.Data) is TControl then
begin
AControl := TControl(SelNode.Data);
ok:=false;
try
AControl.Parent := AContainer;
ok:=true;
DoModified;
except
on E: Exception do
MessageDlg(oisError,
Format(oisUnableToChangeParentOfControlToNewParent, ['"',
DbgSName(AControl), '"', '"', DbgSName(AContainer), '"', #13,
E.Message]), mtError, [mbOk], 0);
end;
if not ok then break;
end;
SelNode := SelNode.GetNextMultiSelected;
end;
end
else
if TObject(Node.Data) is TCollectionItem then
begin
ACollection := TCollectionItem(Node.Data).Collection;
ACollection.BeginUpdate;
case InsertType of
tvimAsNextSibling:
NewIndex := TCollectionItem(Node.Data).Index + 1;
tvimAsPrevSibling:
NewIndex := TCollectionItem(Node.Data).Index;
end;
SelNode := GetLastMultiSelected;
while Assigned(SelNode) do
begin
if (TObject(SelNode.Data) is TCollectionItem) and
(TCollectionItem(SelNode.Data).Collection = ACollection) then
begin
ok := False;
try
AIndex := TCollectionItem(SelNode.Data).Index;
if AIndex < NewIndex then
TCollectionItem(SelNode.Data).Index := NewIndex - 1
else
TCollectionItem(SelNode.Data).Index := NewIndex;
ok := True;
DoModified;
except
on E: Exception do
MessageDlg(E.Message, mtError, [mbOk], 0);
end;
if not ok then break;
end;
SelNode := SelNode.GetPrevMultiSelected;
end;
ACollection.EndUpdate;
end;
RebuildComponentNodes;
end;
inherited DragDrop(Source, X, Y);
end;
procedure TComponentTreeView.DragOver(Source: TObject; X, Y: Integer;
State: TDragState; var Accept: Boolean);
var
Node: TTreeNode;
AnObject: TObject;
AControl: TControl absolute AnObject;
AContainer: TPersistent;
AcceptControl, AcceptContainer: Boolean;
InsertType: TTreeViewInsertMarkType;
ParentNode: TTreeNode;
begin
//debugln('TComponentTreeView.DragOver START ',dbgs(Accept));
AcceptContainer := False;
AcceptControl := True;
GetComponentInsertMarkAt(X, Y, Node, InsertType);
SetInsertMark(Node, InsertType);
// check new parent
ParentNode := Node;
if InsertType in [tvimAsNextSibling, tvimAsPrevSibling] then
ParentNode := ParentNode.Parent;
if Assigned(ParentNode) and Assigned(ParentNode.Data) then
begin
AnObject := TObject(ParentNode.Data);
if (AnObject is TWinControl) then
begin
if (csAcceptsControls in AControl.ControlStyle) and
// Because of TWriter, you can not put a control onto an csInline, csAncestor controls (e.g. on a frame or it child).
([csInline, csAncestor] * AControl.ComponentState = []) and
( // TReader/TWriter only supports this
(AControl.Owner = nil) or // root
(AControl.Owner.Owner = nil) // child of a root
) then
begin
AContainer := TPersistent(AnObject);
//DebugLn(['TComponentTreeView.DragOver AContainer=',DbgSName(AContainer)]);
AcceptContainer := True;
end;
end
else
if (AnObject is TCollection) then
begin
// it is allowed to move container items inside the container
AContainer := TPersistent(AnObject);
AcceptContainer := True;
end;
end;
if AcceptContainer then
begin
Node := GetFirstMultiSelected;
while Assigned(Node) and AcceptControl do
begin
AnObject := TObject(Node.Data);
// don't allow to move ancestor components
if (AnObject is TComponent) and
(csAncestor in TComponent(AnObject).ComponentState) then break;
if (AnObject is TControl) then
begin
if AnObject = AContainer then break;
if not (AContainer is TWinControl) then break;
//DebugLn(['TComponentTreeView.DragOver AControl=',DbgSName(AControl),' Parent=',DbgSName(AControl.Parent),' OldAccepts=',csAcceptsControls in AControl.Parent.ControlStyle]);
// check if new parent allows this control class
if not TWinControl(AContainer).CheckChildClassAllowed(AnObject.ClassType, False) then
break;
// check if one of the parent of the container is the control itself
if AControl.IsParentOf(TWinControl(AContainer)) then break;
// do not move children of a restricted parent to another parent
// e.g. TPage of TPageControl
if (AControl.Parent <> nil) and (AControl.Parent <> AContainer) and
(not (csAcceptsControls in AControl.Parent.ControlStyle)) then
break;
end
else
if (AnObject is TCollectionItem) then
begin
if AnObject = AContainer then break;
if not (AContainer is TCollection) then
break;
if TCollectionItem(AnObject).Collection <> TCollection(AContainer) then
break;
end;
Node := Node.GetNextMultiSelected;
end;
AcceptControl := (Node = nil);
end;
Accept := AcceptContainer and AcceptControl;
//debugln('TComponentTreeView.DragOver A ',dbgs(Accept));
inherited DragOver(Source, X, Y, State, Accept);
//debugln('TComponentTreeView.DragOver B ',dbgs(Accept));
Accept := AcceptContainer and AcceptControl and ((OnDragOver=nil) or Accept);
end;
procedure TComponentTreeView.DragCanceled;
begin
SetInsertMark(nil, tvimNone);
inherited DragCanceled;
end;
procedure TComponentTreeView.MouseLeave;
begin
SetInsertMark(nil,tvimNone);
inherited MouseLeave;
end;
procedure TComponentTreeView.GetComponentInsertMarkAt(X, Y: Integer; out
AnInsertMarkNode: TTreeNode; out AnInsertMarkType: TTreeViewInsertMarkType);
var
Node: TTreeNode;
begin
Node := GetFirstMultiSelected;
if (Node <> nil) and (TObject(Node.Data) is TControl) then
begin
// TWinControl allows only to add/remove children, but not at a specific position
AnInsertMarkNode := GetNodeAt(X,Y);
AnInsertMarkType := tvimAsFirstChild;
end
else
begin
GetInsertMarkAt(X, Y, AnInsertMarkNode, AnInsertMarkType);
if (Node <> nil) and (TObject(Node.Data) is TCollectionItem) then
if AnInsertMarkType = tvimAsFirstChild then
AnInsertMarkType := tvimAsPrevSibling;
end;
end;
procedure TComponentTreeView.DoModified;
begin
if Assigned(FOnModified) then
OnModified(Self);
end;
function TComponentTreeView.GetImageFor(APersistent: TPersistent): integer;
begin
if Assigned(APersistent) then
begin
if (APersistent is TControl) and (csAcceptsControls in TControl(APersistent).ControlStyle) then
Result := 3
else
if (APersistent is TControl) then
Result := 2
else
if (APersistent is TComponent) then
Result := 1
else
if (APersistent is TCollection) then
Result := 4
else
if (APersistent is TCollectionItem) then
Result := 5;
end
else
Result := -1;
end;
procedure TComponentTreeView.SetPropertyEditorHook(
const AValue: TPropertyEditorHook);
begin
if FPropertyEditorHook=AValue then exit;
FPropertyEditorHook:=AValue;
RebuildComponentNodes;
end;
function TComponentTreeView.GetSelection: TPersistentSelectionList;
begin
Result:=FComponentList.Selection;
end;
constructor TComponentTreeView.Create(TheOwner: TComponent);
begin
inherited Create(TheOwner);
DragMode := dmAutomatic;
FComponentList:=TBackupComponentList.Create;
Options := Options + [tvoAllowMultiselect, tvoAutoItemHeight, tvoKeepCollapsedNodes, tvoReadOnly];
FImageList := TImageList.Create(nil);
FImageList.AddLazarusResource('oi_form');
FImageList.AddLazarusResource('oi_comp');
FImageList.AddLazarusResource('oi_control');
FImageList.AddLazarusResource('oi_box');
FImageList.AddLazarusResource('oi_collection');
FImageList.AddLazarusResource('oi_item');
Images := FImageList;
end;
destructor TComponentTreeView.Destroy;
begin
FreeThenNil(FComponentList);
FreeThenNil(FImageList);
inherited Destroy;
end;
procedure TComponentTreeView.RebuildComponentNodes;
var
Candidates: TAvgLvlTree;
RootObject: TPersistent;
RootComponent: TComponent absolute RootObject;
procedure AddChildren(AComponent: TComponent; ANode: TTreeNode);
var
walker: TComponentWalker;
Root: TComponent;
begin
walker := TComponentWalker.Create(Self, Candidates, RootComponent, ANode);
try
// add inline components children
if csInline in AComponent.ComponentState then
Root := AComponent
else
Root := RootComponent;
TComponentAccessor(AComponent).GetChildren(@walker.Walk, Root);
finally
walker.Free;
end;
end;
procedure AddCandidates(OwnerComponent: TComponent);
var
AComponent: TComponent;
Candidate: TComponentCandidate;
i: Integer;
begin
if OwnerComponent = nil then Exit;
for i := 0 to OwnerComponent.ComponentCount - 1 do
begin
AComponent := OwnerComponent.Components[i];
Candidate := TComponentCandidate.Create;
Candidate.APersistent := AComponent;
if Candidates.Find(Candidate)<>nil then
begin
DebugLn('WARNING: TComponentTreeView.RebuildComponentNodes doppelganger found ', AComponent.Name);
Candidate.Free;
end
else
begin
Candidates.Add(Candidate);
if csInline in AComponent.ComponentState then
AddCandidates(AComponent);
end;
end;
end;
var
OldExpanded: TTreeNodeExpandedState;
RootNode: TTreeNode;
Candidate: TComponentCandidate;
begin
BeginUpdate;
// save old expanded state and clear
OldExpanded:=TTreeNodeExpandedState.Create(Self);
Items.Clear;
RootObject := PropertyEditorHook.LookupRoot;
if RootObject <> nil then
begin
Candidates:=TAvgLvlTree.Create(TListSortCompare(@CompareComponentCandidates));
try
// first add the lookup root
RootNode := Items.Add(nil, CreateNodeCaption(RootObject));
RootNode.Data := RootObject;
RootNode.ImageIndex := 0;
RootNode.SelectedIndex := RootNode.ImageIndex;
RootNode.MultiSelected := Selection.IndexOf(RootObject) >= 0;
// create candidate nodes for every child
Candidate := TComponentCandidate.Create;
Candidate.APersistent := RootObject;
Candidate.Added := True;
Candidates.Add(Candidate);
// add components in creation order and TControl.Parent relationship
if RootObject is TComponent then
begin
AddCandidates(RootComponent);
AddChildren(RootComponent,RootNode);
end;
finally
Candidates.FreeAndClear;
Candidates.Free;
end;
RootNode.Expand(true);
end;
// restore old expanded state
OldExpanded.Apply(Self);
OldExpanded.Free;
MakeSelectionVisible;
EndUpdate;
end;
procedure TComponentTreeView.UpdateComponentNodesValues;
procedure UpdateComponentNode(ANode: TTreeNode);
var
AComponent: TComponent;
begin
if ANode=nil then exit;
AComponent:=TComponent(ANode.Data);
ANode.Text:=CreateNodeCaption(AComponent);
UpdateComponentNode(ANode.GetFirstChild);
UpdateComponentNode(ANode.GetNextSibling);
end;
begin
UpdateComponentNode(Items.GetFirstNode);
end;
function TComponentTreeView.CreateNodeCaption(APersistent: TPersistent): string;
function GetCollectionName(ACollection: TCollection): String;
var
PropList: PPropList;
i, PropCount: Integer;
begin
Result := TCollectionAccess(ACollection).PropName;
if Result <> '' then
Exit;
Result := '<unknown>';
if ACollection.Owner = nil then
Exit;
PropCount := GetPropList(ACollection.Owner, PropList);
try
for i := 0 to PropCount - 1 do
if (PropList^[i]^.PropType^.Kind = tkClass) and
(GetObjectProp(ACollection.Owner, PropList^[i], ACollection.ClassType) = ACollection) then
Exit(PropList^[i]^.Name);
finally
FreeMem(PropList);
end;
end;
begin
Result := APersistent.ClassName;
if APersistent is TComponent then
Result := TComponent(APersistent).Name + ': ' + Result
else
if APersistent is TCollection then
Result := GetCollectionName(TCollection(APersistent)) + ': ' + Result
else
if APersistent is TCollectionItem then
Result := IntToStr(TCollectionItem(APersistent).Index) + ' - ' + TCollectionItem(APersistent).DisplayName;
end;
initialization
{$I ../images/componenttreeview.lrs}
end.
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