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{
*****************************************************************************
See the file COPYING.modifiedLGPL.txt, included in this distribution,
for details about the license.
*****************************************************************************
Author: Alexander Klenin
}
unit TASubcomponentsEditor;
{$H+}
interface
uses
Classes, ComCtrls, ComponentEditors, Forms, Menus, PropEdits, StdCtrls;
type
{ TSubComponentListEditor }
TSubComponentListEditor = class(TComponentEditor)
protected
function MakeEditorForm: TForm; virtual; abstract;
public
procedure ExecuteVerb(Index: Integer); override;
function GetVerbCount: Integer; override;
end;
{ TComponentListPropertyEditor }
TComponentListPropertyEditor = class(TPropertyEditor)
protected
function GetChildrenCount: Integer; virtual; abstract;
function MakeEditorForm: TForm; virtual; abstract;
public
procedure Edit; override;
function GetAttributes: TPropertyAttributes; override;
function GetValue: AnsiString; override;
end;
{ TComponentListEditorForm }
TComponentListEditorForm = class(TForm)
ChildrenListBox: TListBox;
menuAddItem: TPopupMenu;
tbAdd: TToolButton;
tbCommands: TToolBar;
tbDelete: TToolButton;
tbMoveDown: TToolButton;
tbMoveUp: TToolButton;
procedure ChildrenListBoxClick(Sender: TObject);
procedure FormClose(Sender: TObject; var CloseAction: TCloseAction);
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure miAddClick(Sender: TObject);
procedure tbDeleteClick(Sender: TObject);
procedure tbMoveDownClick(Sender: TObject);
procedure tbMoveUpClick(Sender: TObject);
private
FComponentEditor: TSubComponentListEditor;
FDesigner: TComponentEditorDesigner;
FParent: TComponent;
FPropertyEditor: TComponentListPropertyEditor;
function FindChild(ACandidate: TPersistent; out AIndex: Integer): Boolean;
procedure MoveSelection(AStart, ADir: Integer);
procedure OnComponentRenamed(AComponent: TComponent);
procedure OnGetSelection(const ASelection: TPersistentSelectionList);
procedure OnPersistentAdded(APersistent: TPersistent; ASelect: Boolean);
procedure OnPersistentDeleting(APersistent: TPersistent);
procedure OnSetSelection(const ASelection: TPersistentSelectionList);
procedure RefreshList;
procedure SelectionChanged(AOrderChanged: Boolean = false);
protected
procedure AddSubcomponent(AParent, AChild: TComponent); virtual; abstract;
procedure AddSubcomponentClass(const ACaption: String; ATag: Integer);
procedure BuildCaption; virtual; abstract;
function ChildClass: TComponentClass; virtual; abstract;
procedure EnumerateSubcomponentClasses; virtual; abstract;
function GetChildrenList: TFPList; virtual; abstract;
function MakeSubcomponent(
AOwner: TComponent; ATag: Integer): TComponent; virtual; abstract;
property Parent: TComponent read FParent;
public
constructor Create(
AOwner, AParent: TComponent; AComponentEditor: TSubComponentListEditor;
APropertyEditor: TComponentListPropertyEditor); reintroduce;
destructor Destroy; override;
end;
implementation
uses
IDEImagesIntf, Math, SysUtils,
TAChartStrConsts, TAChartUtils;
{$R *.lfm}
{ TComponentListPropertyEditor }
procedure TComponentListPropertyEditor.Edit;
var
propValue: TPersistent;
editorForm: TForm;
begin
propValue := GetComponent(0);
if propValue = nil then
raise Exception.Create('TComponentListPropertyEditor.Component=nil');
editorForm := FindEditorForm(propValue) as TForm;
if editorForm = nil then begin
editorForm := MakeEditorForm;
RegisterEditorForm(editorForm, propValue);
end;
editorForm.EnsureVisible;
end;
function TComponentListPropertyEditor.GetAttributes: TPropertyAttributes;
begin
Result := [paDialog, paReadOnly];
end;
function TComponentListPropertyEditor.GetValue: ansistring;
var
c: Integer;
begin
c := GetChildrenCount;
if c = 1 then
Result := '1 item'
else
Result := IntToStr(c) + ' items';
end;
{ TSubComponentListEditor }
procedure TSubComponentListEditor.ExecuteVerb(Index: Integer);
var
propValue: TPersistent;
editorForm: TForm;
begin
if Index <> 0 then exit;
propValue := GetComponent;
if propValue = nil then
raise Exception.Create('TSubComponentListEditor.Component=nil');
editorForm := FindEditorForm(propValue) as TForm;
if editorForm = nil then begin
editorForm := MakeEditorForm;
RegisterEditorForm(editorForm, propValue);
end;
editorForm.ShowOnTop;
end;
function TSubComponentListEditor.GetVerbCount: Integer;
begin
Result := 1;
end;
{ TComponentListEditorForm }
procedure TComponentListEditorForm.AddSubcomponentClass(
const ACaption: String; ATag: Integer);
var
mi: TMenuItem;
begin
if ACaption = '' then exit; // Empty names denote deprecated components.
mi := TMenuItem.Create(Self);
mi.OnClick := @miAddClick;
mi.Caption := ACaption;
mi.Tag := ATag;
menuAddItem.Items.Add(mi);
end;
procedure TComponentListEditorForm.ChildrenListBoxClick(Sender: TObject);
begin
SelectionChanged;
end;
constructor TComponentListEditorForm.Create(
AOwner, AParent: TComponent; AComponentEditor: TSubComponentListEditor;
APropertyEditor: TComponentListPropertyEditor);
begin
inherited Create(AOwner);
FParent := AParent;
FComponentEditor := AComponentEditor;
FPropertyEditor := APropertyEditor;
if FComponentEditor <> nil then
FDesigner := FComponentEditor.Designer
else
FDesigner := FindRootDesigner(FParent) as TComponentEditorDesigner;
BuildCaption;
EnumerateSubcomponentClasses;
RefreshList;
if Assigned(GlobalDesignHook) then
begin
GlobalDesignHook.AddHandlerComponentRenamed(@OnComponentRenamed);
GlobalDesignHook.AddHandlerPersistentDeleting(@OnPersistentDeleting);
GlobalDesignHook.AddHandlerGetSelection(@OnGetSelection);
GlobalDesignHook.AddHandlerSetSelection(@OnSetSelection);
GlobalDesignHook.AddHandlerPersistentAdded(@OnPersistentAdded);
end;
SelectionChanged;
end;
destructor TComponentListEditorForm.Destroy;
begin
UnregisterEditorForm(Self);
inherited Destroy;
end;
function TComponentListEditorForm.FindChild(
ACandidate: TPersistent; out AIndex: Integer): Boolean;
begin
if ACandidate is ChildClass then
AIndex := ChildrenListBox.Items.IndexOfObject(ACandidate)
else
AIndex := -1;
Result := AIndex >= 0;
end;
procedure TComponentListEditorForm.FormClose(
Sender: TObject; var CloseAction: TCloseAction);
begin
CloseAction := caFree;
end;
procedure TComponentListEditorForm.FormCreate(Sender: TObject);
begin
tbCommands.Images := IDEImages.Images_16;
tbAdd.ImageIndex := IDEImages.LoadImage('laz_add');
tbDelete.ImageIndex := IDEImages.LoadImage('laz_delete');
tbMoveDown.ImageIndex := IDEImages.LoadImage('arrow_down');
tbMoveUp.ImageIndex := IDEImages.LoadImage('arrow_up');
tbAdd.Caption := rsAdd;
tbDelete.Caption := rsDelete;
tbMoveUp.Caption := rsMoveUp;
tbMoveDown.Caption := rsMoveDown;
end;
procedure TComponentListEditorForm.FormDestroy(Sender: TObject);
begin
if GlobalDesignHook = Nil then
Exit;
if Assigned(FComponentEditor) and Assigned(FParent)
and not (csDestroying in FParent.ComponentState)
and (ChildrenListBox.SelCount > 0) then
GlobalDesignHook.SelectOnlyThis(FParent);
GlobalDesignHook.RemoveAllHandlersForObject(Self);
end;
procedure TComponentListEditorForm.miAddClick(Sender: TObject);
var
s: TComponent;
n: String;
begin
s := MakeSubcomponent(FParent.Owner, (Sender as TMenuItem).Tag);
try
n := Copy(s.ClassName, 2, Length(s.ClassName) - 1);
s.Name := FDesigner.CreateUniqueComponentName(FParent.Name + n);
AddSubcomponent(FParent, s);
FDesigner.PropertyEditorHook.PersistentAdded(s, true);
FDesigner.Modified;
RefreshList;
except
s.Free;
raise;
end;
end;
procedure TComponentListEditorForm.MoveSelection(AStart, ADir: Integer);
var
i: Integer;
begin
if not ChildrenListBox.SelCount = 0 then exit;
i := AStart - ADir;
with ChildrenListBox do
while InRange(i, 0, Count - 1) and InRange(i + ADir, 0, Count - 1) do begin
if Selected[i] and not Selected[i + ADir] then begin
with TIndexedComponent(Items.Objects[i]) do
Index := Index + ADir;
Items.Move(i, i + ADir);
Selected[i + ADir] := true;
Selected[i] := false;
end;
i -= ADir;
end;
FDesigner.Modified;
SelectionChanged(true);
end;
procedure TComponentListEditorForm.OnComponentRenamed(AComponent: TComponent);
var
i: Integer;
begin
if AComponent = nil then exit;
if FindChild(AComponent, i) then
ChildrenListBox.Items[i] := AComponent.Name
else if AComponent = FParent then
BuildCaption;
end;
procedure TComponentListEditorForm.OnGetSelection(
const ASelection: TPersistentSelectionList);
var
i: Integer;
begin
if ASelection = nil then exit;
ASelection.Clear;
with ChildrenListBox do
for i := 0 to Items.Count - 1 do
if Selected[i] then
ASelection.Add(TPersistent(Items.Objects[i]));
end;
procedure TComponentListEditorForm.OnPersistentAdded(
APersistent: TPersistent; ASelect: Boolean);
var
s: TComponent;
begin
if (APersistent = nil) or not (APersistent is ChildClass) then exit;
s := APersistent as TComponent;
if s.GetParentComponent <> FParent then exit;
with ChildrenListBox do
Selected[Items.AddObject(s.Name, s)] := ASelect;
end;
procedure TComponentListEditorForm.OnPersistentDeleting(
APersistent: TPersistent);
var
i, wasSelected: Integer;
begin
if not FindChild(APersistent, i) then exit;
with ChildrenListBox do begin
wasSelected := ItemIndex;
Items.Delete(i);
ItemIndex := Min(wasSelected, Count - 1);
end;
end;
procedure TComponentListEditorForm.OnSetSelection(
const ASelection: TPersistentSelectionList);
var
i, j: Integer;
begin
if ASelection = nil then exit;
ChildrenListBox.ClearSelection;
for i := 0 to ASelection.Count - 1 do
if FindChild(ASelection.Items[i], j) then
ChildrenListBox.Selected[j] := true;
end;
procedure TComponentListEditorForm.RefreshList;
var
ci: TStrings;
i: Integer;
begin
ci := ChildrenListBox.Items;
try
ci.BeginUpdate;
ci.Clear;
with GetChildrenList do
for i := 0 to Count - 1 do
ci.AddObject(TComponent(Items[i]).Name, TObject(Items[i]));
finally
ci.EndUpdate;
end;
end;
procedure TComponentListEditorForm.SelectionChanged(AOrderChanged: Boolean);
var
sel: TPersistentSelectionList;
begin
if GlobalDesignHook=nil then exit;
GlobalDesignHook.RemoveHandlerSetSelection(@OnSetSelection);
try
sel := TPersistentSelectionList.Create;
sel.ForceUpdate := AOrderChanged;
try
OnGetSelection(sel);
FDesigner.PropertyEditorHook.SetSelection(sel);
finally
sel.Free;
end;
finally
GlobalDesignHook.AddHandlerSetSelection(@OnSetSelection);
end;
end;
procedure TComponentListEditorForm.tbDeleteClick(Sender: TObject);
begin
if ChildrenListBox.SelCount = 0 then exit;
FDesigner.DeleteSelection;
SelectionChanged;
end;
procedure TComponentListEditorForm.tbMoveDownClick(Sender: TObject);
begin
MoveSelection(ChildrenListBox.Count - 1, 1);
end;
procedure TComponentListEditorForm.tbMoveUpClick(Sender: TObject);
begin
MoveSelection(0, -1);
end;
end.
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