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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.Panel.Paged;
interface
uses
Boolean,
Collection.List,
Condition,
Condition.Projecting,
Drawing.Canvas,
Geometry._2d.Integer32.Point,
Geometry._2d.Integer32.Rectangle,
Geometry._2d.Integer32.Size,
Integer._32,
Iterator,
Text,
UserInterface.Control,
UserInterface.Control.Event,
UserInterface.Control.Panel;
type
TPageInformation = class(TObject)
public
Control: TControl;
FocusedControl: TControl;
Caption: TText;
constructor Create(const Caption: TText); virtual;
function ControlToFocus(): TControl;
public
type
TWithControl = class(TProjectingCondition<TPageInformation, TControl>)
public
function Matches(const PageInformation: TPageInformation): TBoolean; override;
end;
end;
TPageInformationControlIterator = class(TIterator<TControl>)
protected
Iterator: TIterator<TPageInformation>;
function GetCurrent(): TControl; override;
public
constructor Create(Iterator: TIterator<TPageInformation>); virtual;
destructor Destroy(); override;
function IsValid(): TBoolean; override;
procedure GotoNext(); override;
end;
TPagedPanel = class(TOpaquePanel)
private
FActivePage: TControl;
FInsertPoint: TInteger32;
FDraggedActivePage: TBoolean;
procedure SetActivePage(const Value: TControl);
function GetActivePageIndex: TInteger32;
procedure SetActivePageIndex(const Value: TInteger32);
function GetPages(Index: TInteger32): TControl;
procedure SetInsertPoint(const Value: TInteger32);
function PageHasFocus(Page: TControl): TBoolean;
protected
PageInformations: TList<TPageInformation>;
procedure BoundsChanged(const OldBounds: TInteger32Rectangle; const NewBounds: TInteger32Rectangle); override;
procedure ResizeActivePage(); virtual;
procedure FireActivePageChanged();
procedure ChildControlAdded(Control: TControl); override;
procedure ChildControlRemoved(Control: TControl); override;
public
IsExplorerTarget: TBoolean;
constructor Create(); override;
destructor Destroy(); override;
procedure Paint(Canvas: TCanvas); override;
procedure GainedFocus(); override;
function Embellish(): TControl; override;
function GetPreferredSize(AvailableSize: TInteger32Size): TInteger32Size; override;
procedure AddPage(Page: TControl; Activate: TBoolean = False);
procedure InsertPage(Index: TInteger32; Page: TControl; Activate: TBoolean = False);
procedure RemovePage(Page: TControl);
function IndexOfPage(Page: TControl): TInteger32;
procedure ClosePage(Index: TInteger32);
function PageCount(): TInteger32;
function GetPageCaption(Index: TInteger32): TText;
procedure CloseControl(Control: TControl); override;
procedure MakeRectangleVisibleForControl(Control: TControl; Rectangle: TInteger32Rectangle); override;
function IsChildVisible(Control: TControl): TBoolean; override;
function CreateDragSource(Control: TControl): TDragSite; override;
function CreateDragTarget(Source: TDragSite; const Position: TInteger32Point): TDragSite; override;
function IsDynamicContainer(): TBoolean; override;
function FindFirstDescendant(Condition: TCondition<TControl>): TControl; override;
function CreateChildIterator(): TIterator<TControl>; override;
property ActivePage: TControl read FActivePage write SetActivePage;
property ActivePageIndex: TInteger32 read GetActivePageIndex write SetActivePageIndex;
property Pages[Index: TInteger32]: TControl read GetPages;
property InsertPoint: TInteger32 read FInsertPoint write SetInsertPoint;
property DraggedActivePage: TBoolean read FDraggedActivePage write FDraggedActivePage;
end;
TPagedPanelDragSource = class(TDragSite)
protected
PagedPanel: TPagedPanel;
public
constructor Create(PagedPanel: TPagedPanel; Control: TControl); reintroduce; virtual;
procedure Detach(); override;
end;
TPagedPanelDragTarget = class(TDragSite)
public
PagedPanel: TPagedPanel;
constructor Create(PagedPanel: TPagedPanel; InsertIndex: TInteger32); reintroduce; virtual;
destructor Destroy(); override;
procedure Attach(Control: TControl); override;
end;
TPagedPanelEvent = class(TControlEvent)
public
PagedPanel: TPagedPanel;
constructor Create(PagedPanel: TPagedPanel); reintroduce; virtual;
end;
TPagedPanelInsertPointChanged = class(TPagedPanelEvent);
TPagedPanelPagesChanged = class(TPagedPanelEvent);
implementation
uses
Color.Constants,
Drawing.Stroke,
Mathematics,
Object_.List,
UserInterface.Control.Panel.FixedSide,
UserInterface.Control.Tab,
UserInterface.DragAndDrop.Action;
{ TPagedPanel }
constructor TPagedPanel.Create();
begin
inherited Create();
FInsertPoint := -1;
PageInformations := TObjectList<TPageInformation>.Create();
end;
function TPagedPanel.CreateChildIterator(): TIterator<TControl>;
begin
Result := TPageInformationControlIterator.Create(PageInformations.CreateIterator());
end;
function TPagedPanel.CreateDragSource(Control: TControl): TDragSite;
begin
if IndexOfPage(Control) <> -1 then
begin
Result := TPagedPanelDragSource.Create(Self, Control);
Result.Actions := [TDragDropAction.Move];
end
else
Result := nil;
end;
function TPagedPanel.CreateDragTarget(Source: TDragSite; const Position: TInteger32Point): TDragSite;
begin
if (PageCount = 0) and not Source.Control.HierarchyContainsControl(Self) then
begin
Result := TPagedPanelDragTarget.Create(Self, 0);
Result.Actions := [TDragDropAction.Move];
end
else
Result := nil;
end;
destructor TPagedPanel.Destroy();
var
i: TInteger32;
begin
if ActivePage <> nil then
ChildControls.Remove(ActivePage);
for i := 0 to PageInformations.Count - 1 do
PageInformations[i].Control.Free();
PageInformations.Free();
inherited Destroy();
end;
procedure TPagedPanel.SetActivePage(const Value: TControl);
var
PageHadFocus: TBoolean;
PageIndex: TInteger32;
ControlToFocus: TControl;
begin
if Value <> ActivePage then
begin
if ActivePage <> nil then
begin
PageHadFocus := PageHasFocus(ActivePage);
PageIndex := PageInformations.IndexOf(TPageInformation.TWithControl.Create(ActivePage));
if PageHadFocus and (PageIndex <> -1) then
PageInformations[PageIndex].FocusedControl := GetFocusManager().FocusedControl;
ChildControls.Remove(ActivePage);
end
else
PageHadFocus := False;
FActivePage := Value;
if ActivePage <> nil then
begin
ResizeActivePage();
ChildControls.Add(ActivePage);
if PageHadFocus then
begin
ControlToFocus := PageInformations[PageInformations.IndexOf(TPageInformation.TWithControl.Create(ActivePage))].ControlToFocus;
if ControlToFocus <> nil then
ControlToFocus.RequestFocus();
end;
end
else if PageHadFocus then
RequestFocus();
Invalidate();
FireActivePageChanged();
end;
end;
procedure TPagedPanel.ResizeActivePage();
begin
if ActivePage <> nil then
ActivePage.Bounds := Bounds.Size;
end;
function TPagedPanel.GetActivePageIndex(): TInteger32;
begin
Result := IndexOfPage(ActivePage);
end;
procedure TPagedPanel.SetActivePageIndex(const Value: TInteger32);
begin
if (Value >= 0) and (Value < PageCount) then
ActivePage := Pages[Value]
else
ActivePage := nil;
end;
procedure TPagedPanel.SetInsertPoint(const Value: TInteger32);
begin
if Value <> InsertPoint then
begin
FInsertPoint := Value;
Listeners.DistributeEvent(TPagedPanelInsertPointChanged.Create(Self));
end;
end;
procedure TPagedPanel.GainedFocus();
begin
if ActivePage <> nil then
ActivePage.RequestFocus();
end;
procedure TPagedPanel.AddPage(Page: TControl; Activate: TBoolean = False);
begin
InsertPage(PageCount, Page, Activate);
end;
function TPagedPanel.IndexOfPage(Page: TControl): TInteger32;
begin
Result := PageInformations.IndexOf(TPageInformation.TWithControl.Create(Page));
end;
procedure TPagedPanel.InsertPage(Index: TInteger32; Page: TControl; Activate: TBoolean = False);
var
PageInformation: TPageInformation;
begin
Page := Page.Embellish();
Page.ParentControl := Self;
PageInformation := TPageInformation.Create(Page.Caption);
PageInformation.Control := Page;
PageInformations.AddAt(Index, PageInformation);
Listeners.DistributeEvent(TPagedPanelPagesChanged.Create(Self));
if (ActivePage = nil) or Activate then
ActivePage := Page;
Page.Bounds := Bounds.Size;
end;
function TPagedPanel.IsChildVisible(Control: TControl): TBoolean;
begin
Result := (Control = ActivePage) and IsVisible;
end;
function TPagedPanel.IsDynamicContainer: TBoolean;
begin
Result := True;
end;
procedure TPagedPanel.RemovePage(Page: TControl);
var
Index: TInteger32;
begin
Page.ParentControl := nil;
Index := IndexOfPage(Page);
PageInformations.RemoveAt(Index);
Listeners.DistributeEvent(TPagedPanelPagesChanged.Create(Self));
if PageCount = 0 then
ActivePage := nil
else if Page = ActivePage then
ActivePage := Pages[Minimum(Index, PageCount - 1)];
Invalidate();
end;
function TPagedPanel.PageCount(): TInteger32;
begin
Result := PageInformations.Count;
end;
function TPagedPanel.PageHasFocus(Page: TControl): TBoolean;
var
FocusManager: TKeyboardFocusManager;
FocusedControl: TControl;
begin
FocusManager := GetFocusManager();
if FocusManager <> nil then
begin
FocusedControl := FocusManager.FocusedControl;
Result := FocusedControl.HasAncestor(ActivePage);
end
else
Result := False;
end;
function TPagedPanel.GetPageCaption(Index: TInteger32): TText;
begin
Result := PageInformations[Index].Caption;
end;
function TPagedPanel.GetPages(Index: TInteger32): TControl;
begin
Result := PageInformations[Index].Control;
end;
function TPagedPanel.FindFirstDescendant(Condition: TCondition<TControl>): TControl;
var
i: TInteger32;
begin
Condition.AddReference();
if Condition.Matches(Self) then
Result := Self
else
begin
Result := nil;
i := 0;
while (Result = nil) and (i < PageCount()) do
begin
Result := Pages[i].FindFirstDescendant(Condition);
Inc(i);
end;
end;
Condition.ReleaseReference();
end;
procedure TPagedPanel.FireActivePageChanged();
begin
FireEvent(TControlFocusedItemChangedEvent.Create(Self));
end;
procedure TPagedPanel.Paint(Canvas: TCanvas);
begin
inherited Paint(Canvas);
if PageCount = 0 then
begin
Canvas.Stroke := TStroke.Create(TNamedColor.Black, 1);
Canvas.DrawRectangle(Bounds.Size);
end;
end;
function TPagedPanel.Embellish(): TControl;
var
TabControl: TTabControl;
FixedTopPanel: TFixedTopPanel;
begin
TabControl := TTabControl.Create();
TabControl.PagedPanel := Self;
FixedTopPanel := TFixedTopPanel.Create();
FixedTopPanel.Caption := Caption;
FixedTopPanel.CaptionVisible := CaptionVisible;
FixedTopPanel.TopControl := TabControl;
FixedTopPanel.PanelControl := Self;
// TODO: Is is this the correct location to copy the style size of the paged panel to the resulting panel?
Result := FixedTopPanel.Embellish();
Result.Style.Width.Value := Style.Width.Value;
Result.Style.Height.Value := Style.Height.Value;
end;
procedure TPagedPanel.CloseControl(Control: TControl);
begin
RemovePage(Control);
Control.Free();
end;
procedure TPagedPanel.ClosePage(Index: TInteger32);
begin
CloseControl(Pages[Index]);
end;
procedure TPagedPanel.BoundsChanged(const OldBounds: TInteger32Rectangle; const NewBounds: TInteger32Rectangle);
begin
inherited BoundsChanged(OldBounds, NewBounds);
if OldBounds.Size <> NewBounds.Size then
begin
ResizeActivePage();
Invalidate();
end;
end;
procedure TPagedPanel.ChildControlAdded(Control: TControl);
begin
end;
procedure TPagedPanel.ChildControlRemoved(Control: TControl);
begin
end;
procedure TPagedPanel.MakeRectangleVisibleForControl(Control: TControl; Rectangle: TInteger32Rectangle);
begin
ActivePage := Control;
inherited MakeRectangleVisibleForControl(Control, Rectangle);
end;
function TPagedPanel.GetPreferredSize(AvailableSize: TInteger32Size): TInteger32Size;
begin
if ActivePage <> nil then
Result := ActivePage.GetPreferredSize(AvailableSize)
else
Result := TInteger32Size.New(0, 0);
end;
{ TPageInformation }
function TPageInformation.ControlToFocus(): TControl;
begin
if (FocusedControl <> nil) and FocusedControl.HasAncestor(Control) then
Result := FocusedControl
else
Result := Control.DefaultControlToFocus;
end;
constructor TPageInformation.Create(const Caption: TText);
begin
inherited Create();
Self.Caption := Caption;
end;
{ TPageInformationControlIterator }
constructor TPageInformationControlIterator.Create(Iterator: TIterator<TPageInformation>);
begin
inherited Create();
Self.Iterator := Iterator;
end;
destructor TPageInformationControlIterator.Destroy();
begin
Iterator.Free();
inherited Destroy();
end;
function TPageInformationControlIterator.GetCurrent(): TControl;
begin
Result := Iterator.Current.Control;
end;
procedure TPageInformationControlIterator.GotoNext();
begin
Iterator.GotoNext();
end;
function TPageInformationControlIterator.IsValid(): TBoolean;
begin
Result := Iterator.IsValid();
end;
{ TPageInformation.TWithControl }
function TPageInformation.TWithControl.Matches(const PageInformation: TPageInformation): TBoolean;
begin
Result := PageInformation.Control = ComparisonValue;
end;
{ TPagedPanelDragSource }
constructor TPagedPanelDragSource.Create(PagedPanel: TPagedPanel; Control: TControl);
begin
inherited Create(PagedPanel, Control);
Self.PagedPanel := PagedPanel;
end;
procedure TPagedPanelDragSource.Detach();
begin
PagedPanel.DraggedActivePage := Control = PagedPanel.ActivePage;
if PagedPanel.InsertPoint > PagedPanel.IndexOfPage(Control) then
PagedPanel.InsertPoint := Maximum(PagedPanel.InsertPoint - 1, 0);
PagedPanel.RemovePage(Control);
end;
{ TPagedPanelDragTarget }
procedure TPagedPanelDragTarget.Attach(Control: TControl);
begin
PagedPanel.InsertPage(PagedPanel.InsertPoint, Control);
if PagedPanel.DraggedActivePage then
begin
PagedPanel.ActivePage := Control;
PagedPanel.DraggedActivePage := False;
end;
end;
constructor TPagedPanelDragTarget.Create(PagedPanel: TPagedPanel; InsertIndex: TInteger32);
begin
inherited Create(PagedPanel, nil);
Self.PagedPanel := PagedPanel;
PagedPanel.InsertPoint := InsertIndex;
end;
destructor TPagedPanelDragTarget.Destroy();
begin
PagedPanel.InsertPoint := -1;
inherited Destroy();
end;
{ TPagedPanelEvent }
constructor TPagedPanelEvent.Create(PagedPanel: TPagedPanel);
begin
inherited Create(PagedPanel);
Self.PagedPanel := PagedPanel;
end;
end.
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